Polycarbonate/ester hetero group condensation polymer blends
This application is a division of earlier application Ser. No. 687,551, filed Dec. 28, 1984, which in turn is a division of earlier application Ser. No. 451,180, filed Dec. 20, 1982, now U.S. Pat. No. 4,510,289 issued Apr. 9, 1985, which in turn is a continuation-in-part of application Ser. No. 259,524, filed May 1, 1981, now abandoned. 
    
    
     This invention relates to thermoplastic compositions containing a mixed polycarbonate and thermoplastic condensation polymers containing hetero groups which are admixed to provide compatible blends. More particularly, it relates to compositions comprising a mixed polycarbonate which comprises units derived from a first dihydric phenol which is a bis(hydroxyaryl)sulfone and a second dihydric phenol, and one or more thermoplastic polymers containing hetero groups to provide a compatible blend. 
     BACKGROUND OF THE INVENTION 
     At present, it is known to prepare a copolymer consisting of the reaction product of bis(3,5-dimethyl-4-hydroxyphenyl)sulfone; 2,2-bis(4-hydroxyphenyl)propane and a carbonate precursor. U.S. Pat. No. 3,737,409 describes a process for making such a copolymer, which is disclosed to lend itself to the preparation of textile fibers. 
     U.S. Pat. No. 4,286,057 describes a molding composition comprising blends of polyarylates derived from a dihydric phenol and mixtures of terephthalic acid and isophthalic acid, and at least one thermoplastic polymer compatible therewith. A blend of the polyarylates and an aromatic polycarbonate, where a thermoplastic compatible polymer is optionally added is also mentioned. 
     Polyethylene terephthalate films modified with a minor amount of preferably no more than 10% bisphenol A polycarbonate resin are disclosed in U.S. Pat. No. 3,720,732. Processing difficulties were encountered when higher amounts of the resin were included. In any event, when the working composition of U.S. Pat. No. 3,720,732 are made, a compatible composition in the sense contemplated by the present invention is not obtained when the amount of polycarbonate resin exceeds as little as 5% by weight of the combined amounts of polycarbonate and polyester. 
     In applicants&#39; issued application, Ser. No. 451,181, filed Dec. 20, 1982, now U.S. Pat. No. 4,511,693, there are disclosed and claimed novel compositions comprising mixed polycarbonates and thermoplastic addition polymers containing hetero groups which are admixed to provide compatible compositions. 
     SUMMARY OF THE INVENTION 
     Compatible mixtures of polycarbonates and thermoplastic resins have generally not been produced over a broad range of component proportions. 
     It is an object of this invention to provide blends of polycarbonate and thermoplastic condensation polymers which are compatible in mixtures having widely varying ratios of components and which have improved properties. 
     When used herein and in the appended claims, &#34;compatible&#34; refers to blends or compositions of polymers in which the component polymers do not undergo phase separation, thus helping to avoid stratification of the components during or after processing. Compatibility is of great significance for an admixture of different resins, because it ensures homogeneity, and a unity of properties, which greatly facilitates subsequent processing and use of the composition. Incompatible blends separate into phases containing predominantly their own separate components, and thus may be considered to be immiscible. This characteristic, combined with the often low physical attraction forces across the phase boundaries, usually causes immiscible/incompatible blend systems to have poor mechanical properties, thus preventing the preparation of useful polymer blends. 
     When blends of two polymers exhibit a single glass transition temperature (Tg), it generally signifies the resin components are compatible. However, a single Tg is not a necessary condition for a compatible blend. 
     In accordance with the present invention, there are provided thermoplastic compositions comprising a polycarbonate resin and a thermoplastic condensation polymer resin which have been melt admixed to provide a compatible composition. 
     Polycarbonates useful in accordance with the present invention are well known and any, especially the aromatic polycarbonates, may be employed. Intrinsic viscosities of from 0.40 to 0.80 dl./g (as measured in phenol/trichloroethylene) are preferred. Such resins may be formed from dihydric phenol, such as hydrocarbon bisphenol monomer, ordinarily by condensation with a carbonate precursor, such as carbonyl chloride, to provide a linear polymer consisting of units of the dihydric phenol linked to one another through carbonate linkages. The polycarbonate of the invention includes units derived from a dihydric phenol and a dihydric aryl sulfone. 
     In an especially preferred embodiment, a polycarbonate copolymer includes a diphenyl sulfone as described in U.S. Pat. No. 3,737,409 to Fox. For these copolymers a mole or unit ratio of 1:5 to 5:1 is desirable. The preferred diphenyl sulfone monomer for these resins is bis(3,5-dimethyl-4-hydroxyphenyl)sulfone, also known as dixylenol sulfone, which may be formed from 2,6-xylenol. The other preferred monomer is 2,2-bis(4-hydroxyphenyl)propane, also known as bisphenol A. 
     The condensation polymers which are mixed with the polycarbonate to form the compatible composition are comprised of units derived from repeat groups including a heterogroup. Heterogroups are groups containing atoms besides carbon and hydrogen; such atoms are designated heteroatoms. 
     The polymers containing heterogroups can have the heterogroups (A) as pendant groups on the polymer chain or as linkages in the polymer chain: ##STR1## Typical examples of heteroatoms are oxygen, sulfur, nitrogen, halogen, etc. Examples of heterogroups are esters ##STR2## nitrile (R--CN); anhydride ##STR3## imide ##STR4## carbonate ##STR5## and the like. From the foregoing, it follows that polymers within the scope of this invention, without limitation, are illustrated by polyesters, polyamides, polyimides, polyethers, polysulfones, polycarbonates, polyacrylates, and the like. Outside the scope of the invention are polyolefins, poly(vinyl aromatics), and the like. 
     Once formed, the product composition may be employed (or further processed) in conventional manner. Its applications include, for example, tough films useful in packaging. It may also be injection molded or extruded to produce a variety of useful thermoplastic articles. 
     In addition to at least two polymeric components, the present compositions may contain any of the conventional additives, for the purposes for which they are known. These additives include fire-retardants, impact modifiers, pigments, tints, reinforcing materials such as glass fiber, antioxidants and the like. They may be combined with the compositions either before or after melt mixing. 
     Condensation polymers suitable for admixing with the polycarbonate are selected from the group consisting of a copolyestercarbonate, a polyarylate, a poly(aryl ether), a copolyetherester block polymer, a polyhydroxyether, a polyimide, or combinations thereof. 
     (a) Polyesters 
     Polyesters which are suitable for use herein are derived from an aliphatic or cycloaliphatic diol, or mixtures thereof, containing from 2 to about 10 carbon atoms and at least one aromatic dicarboxylic acid. The polyesters which are derived from an aliphatic diol and an aromatic dicarboxylic acid have repeated units of the following general formula: ##STR6## wherein n is an integer of from 2 to 4. 
     The preferred polyester is poly(ethylene terephthalate). 
     Also contemplated herein are the above polyesters with minor amounts, e.g., from 0.5 to about 2 percent by weight, of units derived from aliphatic acid and/or aliphatic polyols, to form copolyesters. The aliphatic polyols include glycols, such as poly(ethylene glycol). These can be made following the teachings of, for example, U.S. Pat. Nos. 2,465,319 and 3,047,539. 
     The polyesters which are derived from a cycloaliphatic diol and an aromatic dicarboxylic acid are prepared by condensing either the cis- or trans-isomer (or mixtures thereof) of, for example, 1,4-cyclohexanedimethanol with an aromatic dicarboxylic acid so as to produce a polyester having recurring units of the following formula: ##STR7## wherein the cyclohexane ring is selected from the cis- and trans-isomers thereof and R represents an aryl radical containing 6 to 20 carbon atoms and which is the decarboxylated residue derived from an aromatic dicarboxylic acid. 
     Examples of aromatic dicarboxylic acids represented by the decarboxylated residue R in formula II are isophthalic or terephthalic acid; 1,2-di(p-carboxyphenyl)ethane, 4,4&#39;-dicarboxydiphenyl ether, etc., and mixtures of these. All of these acids contain at least one aromatic nucleus. Acids containing fused rings can also be present, such as in 1,4- or 1,5-naphthalenedicarboxylic acids. The preferred dicarboxylic acids are terephthalic acid or a mixture of terephthalic and isophthalic acids. 
     Another preferred polyester may be derived from the reaction of either the cis- or trans-isomer (or a mixture thereof) of 1,4-cyclohexanedimethanol with a mixture of isophthalic and terephthalic acids. Such a polyester would have repeating units of the formula: ##STR8## 
     Still another preferred polyester is a copolyester derived from a cyclohexane dimethanol, an alkylene glycol and an aromatic dicarboxylic acid. These copolyesters are prepared by condensing either the cis- or trans-isomer (or mixtures thereof) of, for example, 1,4-cyclohexanedimethanol and an alkylene glycol with an aromatic dicarboxylic acid so as to produce a copolyester having repeating units of the following formula: ##STR9## wherein the cyclohexane ring is selected from the cis- and trans-isomers thereof, R is as previously defined, n is an integer of 2 to 4, the x units comprise from about 10 to about 90 percent by weight and the y units comprise from about 90 to about 10 percent by weight. 
     Such a preferred copolyester may be derived from the reaction of either the cis- or trans-isomer (or mixtures thereof) of 1,4-cyclohexanedimethanol and ethylene glycol with terephthalic acid in a molar ratio of 1:2:3. These copolyesters have repeating units of the following formula: ##STR10## wherein x and y are as previously defined. 
     The polyesters described herein are either commercially available or can be produced by methods well known in the art, such as those set forth in, for example, U.S. Pat. No. 2,901,466. 
     The polyesters used herein have an intrinsic viscosity of from about 0.4 to about 2.0 dl/g. as measured in a 60:40 phenol/tetrachloroethane mixture or similar solvent at 23°-30° C. 
     b. Aromatic Polycarbonate 
     Thermoplastic aromatic polycarbonates that can be employed as the thermoplastic heterogroup containing polymer herein are homopolymers and copolymers and mixtures thereof, which have an intrinsic viscosity of from about 0.4 to about 1.0 dl/g. as measured in methylene chloride at 25° C. The polycarbonates are prepared by reacting a dihydric phenol with a carbonate precursor. Typical of some of the dihydric phenols that may be employed are bisphenol-A, bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 4,4-bis(4-hydroxyphenyl)heptane, 2-2(3,5,3&#39;,5&#39;-tetrabromo-4,4&#39;-dihydroxydiphenyl)propane, (3,3&#39;-dichloro-4,4&#39;-dihydroxydiphenyl)methane, and the like. Other dihydric phenols of the bisphenol type are described in, for Example, U.S. Pat. Nos. 2,999,835, 3,028,365 and 3,334,154. 
     It is, of course, possible to employ two or more different dihydric phenols, or a copolymer of a dihydric phenol, with a glycol or with hydroxy or acid terminated polyesters, or with a dibasic acid, in the event a carbonate copolymer or inter-polymer rather than a homopolymer is desired for use in the preparation of the aromatic carbonate polymer containing heterogroup. 
     The carbonate precursor may be either a carbonyl halide, a carbonate ester, or a haloformate. The carbonyl halides which can be employed herein are carbonyl bromide, carbonyl chloride and mixtures thereof. Typical of the carbonate esters which may be employed herein are diphenyl carbonate, di-(halophenyl)carbonates, such as di-(chlorophenyl)carbonate or di-(bromophenyl)carbonate, etc., di-(alkylphenyl)carbonates such as di-(tolyl)carbonate, di-(naphthyl)carbonate, di-(chloronaphthyl)carbonate, etc. or mixtures thereof. The haloformates suitable for use herein include bishaloformates of dihydric phenols, for example: bischloroformates of bisphenol-A, of hydroquinone, etc.; of glycols, for example: bishaloformates of ethylene glycol, neopentyl glycol, polyethylene glycol, etc. While other carbonate precursors will be apparent to those skilled in the art, carbonyl chloride, also known as phosgene, is preferred. 
     The aromatic polycarbonate polymers may be prepared by methods well known in the art, by using phosgene or haloformate and by employing a molecular weight regulator, an acid acceptor and a catalyst. The molecular weight regulators which can be employed in carrying out the process include monohydric phenols, such as phenol, paratertiary-butylphenol, para-bromophenol, primary and secondary amines, etc. Preferably, a phenol is employed as the molecular weight regulator. 
     A suitable acid acceptor may be either an organic or an inorganic acid acceptor. A suitable organic acid acceptor is a tertiary amine and includes materials, such as pyridine, triethylamine, dimethylaniline, tributylamine, etc. The inorganic acid acceptor may be one which can be either a hydroxide, a carbonate, a bicarbonate, or a phosphate of an alkali or alkaline earth metal. 
     The catalysts which are employed herein can be any of the suitable catalysts that aid the polymerization of, for example, bisphenol-A with phosgene. Suitable catalysts include tertiary amines, such as triethylamine, tripropylamine, N,N-dimethylanaline, quaternary ammonium compounds, such as tetraethylammonium bromide, cetyl triethyl ammonium bromide, tetra-n-heptylammonium iodide, and quaternary phosphonium compounds, such as n-butyltriphenyl-phosphonium bromide and methyl-triphenyl phosphonium bromide. 
     The polycarbonates can be prepared in one-phase (homogeneous solution) or two-phase (interfacial) systems when phosgene or a haloformate are used. Bulk reactions are possible when the diarylcarbonate precursors are used. 
     (c) Poly(arylether)s 
     Poly(aryl ether) resin components suitable for use herein are linear, thermoplastic polyarylene polyether polysulfones, wherein the arylene units are interspersed with ether and sulfone linkages. These resins may be obtained by reaction of an alkali metal double salt of a dihydric phenol and a dihalobenzenoid compound, either or both of which contain a sulfone or ketone linkage i.e., --SO 2  -- or --CO-- between arylene groupings, to provide sulfone or ketone units in the polymer chain in addition to arylene units and ether units. The polysulfone polymer has a basic structure comprising recurring units of the formula: 
     
         --O--E--O--E&#39;-- 
    
     wherein E is the residuum of the dihydric phenol and E&#39; is the residuum of the benzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the valence bonds; both of said residua are valently bonded to the ether oxygens through aromatic carbon atoms. Such polysulfones are included within the class of polyarylene polyether resins described in U.S. Pat. Nos. 3,264,536 and 4,108,837, for example. 
     The residuum of a dihydric phenol, E, is derived from dinuclear phenols having the structure: ##STR11## wherein Ar is an aromatic group and preferably is a phenylene group, A and A 1  may be the same or different inert substituent groups, such as alkyl groups having from 1 to 4 carbon atoms, halogen atoms, i.e., fluorine, chlorine, bromine or iodine or alkoxy radicals having from 1 to 4 carbon atoms, r and r 1  are integers having a value of from 0 to 4, inclusive, and R 1  is representative of a bond between aromatic carbon atoms as in dihydroxydiphenyl, or is a divalent radical, including, for example, CO, O, S, S--S, SO 2  or a divalent organic hydrocarbon radical, such as alkylene, alkylidene, cycloalkylene, or the halogen, alkyl, aryl, or like substituted alkylene, alkylidene and cycloalkylene radicals as well as alkarylene and aromatic radicals and a ring fused to both Ar groups. 
     Typical preferred polymers have recurring units having the following structure: ##STR12## as described in U.S. Pat. No. 4,108,837, supra. In the foregoing formula A and A 1  can be the same or different inert substituent groups such as alkyl groups having from 1 to 4 carbon atoms, halogen atoms (e.g., fluorine, chlorine, bromine or iodine) or alkoxy radicals having from 1 to 4 carbon atoms, r and r1 are integers having a value of from 0 to 4, inclusive. Typically, R 1  is representative of a bond between aromatic carbon atoms or a divalent connecting radical and R 3  represents sulfone, carbonyl, or sulfoxide. Preferably, R 1  represents a bond between aromatic carbon atoms. Even more preferred are the thermoplastic polysulfones of the above formula wherein r and r1 are zero, R 1  is a divalent connection radical of the formula: ##STR13## wherein R&#34; is selected from lower alkyl, aryl, and the halogen substituted groups thereof, preferably methyl, and R 2  is a sulfone group. 
     The poly(aryl ether)s have a reduced viscosity of from about 0.4 to about 1.5 dl/g as measured in an appropriate solvent at an appropriate temperature depending on the particular polyether, such as in methylene chloride at 25° C. 
     The preferred poly(aryl ether)s have repeating units of the formula: ##STR14## 
     (d) Copolyetherester Block Copolymer 
     Copolyetheresters suitable for use herein are well known in the art and are described in, for example, U.S. Pat. Nos. 3,784,520 and 3,766,146. 
     The polyester comprises a multiplicity of recurring intralinear long chain and short chain ester units connected head-to-tail through ester linkages, said long chain ester units being represented by the following structure: ##STR15## and said short chain ester units being represented by the following structure: ##STR16## wherein G is a divalent radical remaining after removal of terminal hydroxy groups from a poly(alkylene oxide) glycol having a molecular weight of from about 400 to about 3500; D is a divalent radical remaining after removal of hydroxyl groups from a low molecular weight diol having a molecular weight of less than about 250; and R 3  is a divalent radical remaining after removal of carboxyl groups from a dicarboxylic acid having a molecular weight of less than about 300, with the proviso that the short chain ester units constitute from about 25 to about 65% by weight of the copolyester, at least about 70% of the R 3  groups are 1,4-phenylene radicals, at least about 70% of the D groups are 1,4-butylene radicals, and the sum of the percentages of the R 3  groups which are not 1,4-phenylene radicals and the D groups which are not 1,4-butylene radicals does not exceed about 30%. 
     The term &#34;long chain ester units&#34; as applied to units in a polymer chain refers to the reaction product of a long chain glycol with a dicarboxylic acid. Such &#34;long chain ester units,&#34; which are repeating units in the copolyester herein, correspond to the structure (a) above. The long chain glycols may be poly(alkylene oxide) glycols having a molecular weight between about 400 and about 3500, preferably between about 600 and about 2000. Copolyesters prepared from poly(alkylene oxide) glycols having a molecular weight between about 600 to about 2000 are preferred. 
     The term &#34;short chain ester units&#34; as applied to units in a polymer chain refers to low molecular weight compounds or polymer chain units having molecular weight of less than about 550. They are made by reacting a low molecular weight diol, (below about 250), with a dicarboxylic acid, to form ester units represented by structure (b) above. 
     Included among the low molecular weight diols, (other than 1,4-butanediol), which react to form short chain ester units are acyclic, alicyclic and aromatic dihydroxy compounds. Preferred are diols with from 2 to 15 carbon atoms, such as ethylene, propylene, isobutylene, tetramethylene, pentamethylene, 2,2-dimethyltrimethylene, hexamethylene and decamethylene glycols, dihydroxy cyclohexane, cyclohexanedimethanol, resorcinol, hydroquinone, 1,5-dihydroxy naphthalene, etc. Especially preferred are aliphatic diols containing from 2 to 8 carbon atoms. Included among the bisphenols which can be used are bis(p-hydroxy)diphenyl, bis(p-hydroxyphenyl)methane, and bis(p-hydroxyphenyl)propane. 
     Dicarboxylic acids (other than terephthalic acid) which are reacted with the foregoing long chain glycols or low molecular weight diols to produce the copolyesters are aliphatic, cycloaliphatic or aromatic dicarboxylic acids. 
     Representative aliphatic and cycloaliphatic acids which may be used are sebacic acid, 1,3-cyclohexane dicarboxylic acid, 1,4-cyclohexane dicarboxylic acid, adipic acid, glutaric acid, succinic acid, carbonic acid, cyclopentanedicarboxylic acid, decahydro-1,5-naphthylene dicarboxylic acid and 4,4-bicyclohexyl dicarboxylic acid. Preferred aliphatic acids are cyclohexane-dicarboxylic acids. 
     Representative aromatic dicarboxylic acids which may be used include phthalic, terephthalic and isophthalic acids, substituted dicarboxy compounds with two benzene nuclei, such as bis(p-carboxyphenyl)methane and p-carboxyphenyl/oxybenzoic acid. Among the aromatic acids, those with from 8 to 16 carbon atoms are preferred, particularly the phenylene dicarboxylic acids, i.e., terephthalic and isophthalic acids. 
     Preferably, at least about 70 mole percent of the dicarboxylic acid incorporated into the polymer is terephthalic acid and at least about 70 mole percent of the low molecular weight diol incorporated into the polymer is 1,4-butanediol. Thus, at least 70% of the R 3  groups in structures (a) and (b) above are 1,4-phenylene radicals and at least about 70% of the D groups in formula b above are 1,4-butylene radicals. 
     The most preferred copolyesters are those prepared from dimethylterephthalate, 1,4-butanediol and poly(tetramethylene oxide) glycol having a molecular weight of from about 600 to about 1500. 
     The copolyetheresters described herein can be made conveniently by a conventional ester interchange reaction by methods well known in the art and as described in, for exchange, U.S. Pat. Nos. 3,784,520 and 3,766,146. 
     (e) Polyhydroxyether 
     The thermoplastic polyhydroxyethers which may be used herein have the following general formula: 
     
         [F--O--D&#34;--O].sub.n 
    
     where F is the radical residuum of a dihydric phenol, D&#34; is a radical residuum of an epoxide selected from mono- and diepoxides and which contain from 1 to 2 hydroxyl groups, and n is an integer which represents the degree of polymerization and is at least about 30 and preferably is above about 80. 
     In general, thermoplastic polyhydroxyethers are prepared by contacting, under polymerization conditions, a dihydric phenol and an epoxide containing from 1 to 2 epoxide groups in substantially equimolar amounts by methods well known in the art. 
     Any dihydric phenol can be used in forming polyhydroxyethers. Illustrative dihydric phenols are mononuclear dihydric phenols such as hydroquinone, resorcinol, and the like as well as the polynuclear phenols. The dihydric polynuclear phenols have the general formula: ##STR17## wherein R 4  is an aromatic divalent hydrocarbon radical, such as naphthylene and phenylene, with phenylene being preferred; B and B 1  may be the same or different and are selected from alkyl radicals, such as methyl, n-propyl, n-butyl, n-hexyl, n-octyl and the like, preferably alkyl radicals having 1 to 4 carbon atoms; a and al are independently integers of 0 to 4, and R&#39; is alkylene, alkylidene cycloalkylene or a saturated divalent group. Particularly preferred are dihydric polynuclear phenols having the general formula: ##STR18## wherein B, B 1 , a and al are as previously defined, and R 6  is an alkylene or alkylidene group, preferably having from 1 to 3 carbon atoms, or cycloalkylene having 6 to 12 carbon atoms. 
     Diepoxides useful for the preparation of polyhydroxyethers may be represented by repeating units of the following formula: ##STR19## wherein R 7  is representative of a bond between adjacent carbon atoms or a divalent organic radical such as an aliphatic, aromatic, cyclic, heterocyclic or acyclic arrangement of atoms. 
     Other diepoxides which can be mentioned include those wherein two oxirane groups are linked through an aromatic ether, i.e., compounds having the grouping 
     
         --C--O--W--O--(R.sub.8 O).sub.d --C-- 
    
     wherein R 8  is a divalent organic radical, W is a divalent aromatic radical residuum of a dihydric phenol, such as those listed above in the description of dihydric phenols, and d is an integer from 0 to 1 inclusive. 
     Still other diepoxides include ethers wherein the oxirane groups are connected to vicinal carbon atoms, at least one pair of which is a part of a cycloaliphatic hydrocarbon. 
     These polyhydroxy ethers are prepared by methods well known in the art, such as those described in, for example, U.S. Pat. Nos. 3,238,087; 3,305,528; 3,294,747; and 3,277,051. 
     (f) Polyimides 
     Polyimides prepared from the reaction between substantially equal molar amounts of aromatic bis(ether anhydride)s of the formula, ##STR20## and organic diamine of the formula, 
     
         H.sub.2 NR.sup.1 HN.sub.2                                  (II) 
    
     in the presence of a phenolic solvent which produces a solution which remains homogeneous when the mixture is allowed to cool to room temperature. There is obtained a solution of polyimide in the phenolic solvent which can be used directly as a wire coating enamel or for applying polyimide onto various substrates. If desired, the polyimide can be recovered by effecting its separation from the phenolic solvent mixture with a non-solvent for polyimide, such as methanol. 
     As shown in formula I, R is a member selected from the class consisting of (a) the following divalent organic radicals: ##STR21## and (b) divalent organic radicals of the general formula ##STR22## where X is a member selected from the class consisting of divalent radicals of the formulas ##STR23## and --S--, where m is 0 or 1, y is a whole number from 1 to 5, and R 1  is a divalent organo radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals, C.sub.( 2-8) alkylene terminated polydiorganosiloxane, cycloalkylene radicals having from 2-20 carbon atoms, and (c) divalent radicals included by the formula, ##STR24## where Q is a member selected from the class consisting of ##STR25## and x is a whole number from 1 to 5 inclusive, and m is as previously defined. 
     These polyimide are prepared by methods well known in the art such as those described in, for example, U.S. Pat. Nos. 3,917,643; 3,852,242; 3,855,176; and 3,833,546. 
    
    
     The following examples are given by way of illustration only and are not intended as a limitation of the scope of this invention. Many variations are possible without departing from its spirit and scope. Unless otherwise specified herein, all proportions are provided on a weight basis. The intrinsic viscosities (I.V.) are all determined in a solvent mixture comprising 60-40 w/w phenol-tetrachloroethene at 30° C. 
     EXAMPLE 1 
     A resin blend is provided by admixing poly(ethylene terephthalate) resin with 45 percent by total resin weight of polycarbonate resin formed from dixylenol sulfone (sulfone) and bisphenol A (bisphenol) in a mole ratio of 1:4. 
     This admixture is melt mixed at a temperature of about 325° C. for 30 minutes in a Brabender mixing bowl to form a melt admixed composition. Comparative properties of the resins and the melt admixed composition are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.61    I.V. =   0.72        I.V. =                                 
                                         0.52                             
Tg =  172° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  108° C.                   
______________________________________                                    
 
    
     The resolution of the distinct glass transition points of the two component resins to the single point for the melt admixed composition shows formation of a homogeneous resin solution. 
     EXAMPLE 2 
     The process of Example 1 is repeated substituting 50 percent by weight of a polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 325° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.48    I.V. =   0.72        I.V. =                                 
                                         0.46                             
Tg =  202° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  120° C.                   
______________________________________                                    
 
    
     EXAMPLE 3 
     The process of Example 1 is repeated substituting 45 percent by weight of polycarbonate having a 3:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 325° C. for 10 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.58    I.V. =   0.72        I.V. =                                 
                                         0.48                             
Tg =  227° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  117° C.                   
______________________________________                                    
 
    
     EXAMPLE 4 
     A poly(ethylene terephthalate) is admixed with 50 percent by total weight of polycarbonate resin formed from sulfone and bisphenol A in a mole ratio of 1:1. 
     This admixture is melt mixed at a temperature of about 270° C. for 3-5 minutes in an 1inch single screw extruder. Comparative properties of the resultant composition are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.58    I.V. =   0.72        I.V. =                                 
                                         0.54                             
Tg =  202° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  103° C.                   
______________________________________                                    
 CL EXAMPLE 5
 
    
     The process of Example 4 is repeated substituting 40 percent by weight of a polycarbonate having 1:1 mole ratio of sulfone to bisphenol. Comparative properties after extruding are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.58    I.V. =   0.72        I.V. =                                 
                                         0.60                             
Tg =  202° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  97° C.                    
______________________________________                                    
 
    
     EXAMPLE 6 
     The process of Example 4 is repeated substituting 90 percent by weight of a polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after extruding are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.45    I.V. =   0.72        I.V. =                                 
                                         0.41                             
Tg =  197° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  169° C.                   
______________________________________                                    
 
    
     EXAMPLE 7 
     The process of Example 1 is repeated substituting 80 percent by weight of polycarbonate having a 4:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 335° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.68    I.V. =   0.72        I.V. =                                 
                                         0.65                             
Tg =  235° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  192° C.                   
______________________________________                                    
 
    
     EXAMPLE 8 
     The process of Example 1 is repeated substituting 80 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 300° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.73    I.V. =   0.72        I.V. =                                 
                                         0.68                             
Tg =  210° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  180° C.                   
______________________________________                                    
 
    
     EXAMPLE 9 
     The process of Example 1 is repeated substituting 80 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 280° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.62    I.V. =   0.72        I.V. =                                 
                                         0.61                             
Tg =  171° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  138° C.                   
______________________________________                                    
 
    
     EXAMPLE 10 
     The process of Example 1 is repeated substituting 60 percent by weight of polycarbonate having a 4:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 325° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.68    I.V. =   0.72        I.V. =                                 
                                         0.63                             
Tg =  235° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  147° C.                   
______________________________________                                    
 
    
     EXAMPLE 11 
     The process of Example 1 is repeated substituting 60 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 300° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.73    I.V. =   0.72        I.V. =                                 
                                         0.68                             
Tg =  210° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  135° C.                   
______________________________________                                    
 
    
     EXAMPLE 12 
     The process of Example 1 is repeated substituting 60 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 275° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.62    I.V. =   0.72        I.V. =                                 
                                         0.64                             
Tg =  171° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  99° C.                    
______________________________________                                    
 
    
     EXAMPLE 13 
     The process of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 4:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 310° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.68    I.V. =   0.72        I.V. =                                 
                                         0.66                             
Tg =  235° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  112° C.                   
______________________________________                                    
 
    
     EXAMPLE 14 
     The process of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 285° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.73    I.V. =   0.72        I.V. =                                 
                                         0.70                             
Tg =  210° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  105° C.                   
______________________________________                                    
 
    
     EXAMPLE 15 
     The process of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 270° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.62    I.V. =   0.72        I.V. =                                 
                                         0.66                             
Tg =  171° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  90° C.                    
______________________________________                                    
 
    
     EXAMPLE 16 
     The process of Example 1 is repeated substituting 20 percent by weight of polycarbonate having a 4:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 310° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.68    I.V. =   0.72        I.V. =                                 
                                         0.67                             
Tg =  235° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  85° C.                    
______________________________________                                    
 
    
     EXAMPLE 17 
     The process of Example 1 is repeated substituting 20 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 275° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.73    I.V. =   0.72        I.V. =                                 
                                         0.65                             
Tg =  210° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  83° C.                    
______________________________________                                    
 
    
     EXAMPLE 18 
     The process of Example 1 is repeated substituting 20 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol. Comparative properties after melt admixture at about 270° C. for 5 minutes are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(ethylene terephthalate)                                    
                             Composition                                  
______________________________________                                    
I.V. =                                                                    
      0.62    I.V. =   0.72        I.V. =                                 
                                         0.63                             
Tg =  171° C.                                                      
              Tg =     67° C. (amorphous)                          
                                   Tg =  82° C.                    
______________________________________                                    
 
    
     EXAMPLE 19 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight poly(butylene terephthalate). Comparative properties after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(butylene terephthalate)                                    
                            Composition                                   
______________________________________                                    
I.V. =                                                                    
      0.62    I.V. =     1.02     I.V. = 0.73                             
Tg =  210° C.                                                      
              Tg =       45° C.                                    
                                  Tg =   102° C.                   
______________________________________                                    
 
    
     EXAMPLE 20 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 4:1 mole ratio of sulfone to bisphenol and 50 percent by weight poly(butylene terephthalate). The results after melt admixture at about 310° C. are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(butylene terephthalate)                                    
                            Composition                                   
______________________________________                                    
I.V. =                                                                    
      0.65    I.V. =     1.02     I.V. = 0.75                             
Tg =  235° C.                                                      
              Tg =       45° C.                                    
                                  Tg =   112° C.                   
______________________________________                                    
 
    
     EXAMPLE 21 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol and 50 percent by weight of 1 poly(butylene terephthalate). The results after melt admixture at about 290° C. are as follows: 
     
         ______________________________________                                    
Polycarbonate                                                             
          Poly(butylene terephthalate)                                    
                            Composition                                   
______________________________________                                    
I.V. =                                                                    
      0.73    I.V. =     1.02     I.V. = 0.84                             
Tg =  171° C.                                                      
              Tg =       45° C.                                    
                                  Tg =   97° C.                    
______________________________________                                    
 
    
     EXAMPLE 22 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight poly(butylene terephthalate) (manufactured by General Electric Company under the trademark Valox 310) are melt mixed in an extruder operating under the following conditions: 
     
         ______________________________________                                    
Temperature                                                               
RPM   Zone 1     Zone 2  Zone 3  Die Melt                                 
                                        Amp.                              
______________________________________                                    
30    530° F.                                                      
                 565° F.                                           
                         565° F.                                   
                                 540° F.                           
                                        3.0                               
______________________________________                                    
 
    
     The extruded, blended polymer strands are chopped into pellets which are dried and injection-molded (into specimens suitable for testing) in a 3 ounce/75 ton Newbury injection molding machine operating under the following conditions: 
     
         ______________________________________                                    
Barrel Temperature     530° F.                                     
Mold Temperature       150° F.                                     
Molding Pressure       10,000 psi                                         
______________________________________                                    
 
    
     The specimens were evaluated for flexural properties (ASTM D790) and heat distortion temperature (ASTM D256). Comparative data is presented in Table I. 
     
                       TABLE I                                                     
______________________________________                                    
         Flexural Flexural Heat Distortion                                
         Modulus  Strength Temperature                                    
         (psi)    (psi)    (°C.)                                   
______________________________________                                    
Valox 310  340,000    12,800   54                                         
poly(butylene                                                             
terephthalate)                                                            
Specimen   381,000    14,300   73                                         
______________________________________                                    
 
    
     EXAMPLE 23 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight of a copolyester derived from ethylene glycol, cyclohexane dimethanol and terephthalic acid (manufactured by Eastman Kodak Co. under the trademark Kodar PETG) is extruder blended, and injection molded, and tested for properties substantially as described in Example 22. Comparative results are as follows: 
     
         ______________________________________                                    
Property     Specimens  Kodar PETG Copolyester                            
______________________________________                                    
Tg, °C.                                                            
                131        80                                             
HDT, °C.                                                           
                106        65                                             
Notched Izod, ft-lb/in                                                    
             0.8        0.8-1.9                                           
Flex. Mod., psi                                                           
             370,000    308,000                                           
Flex. Str., psi                                                           
              17,100     11,400                                           
______________________________________                                    
 
    
     EXAMPLE 24 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight of a copolyester derived from cyclohexane dimethanol and iso/terephthalic acids (manufactured by Eastman Kodak Company under the trademark Kodar A-150) is extruder blended, injection molded, and tested for properties substantially as described in Example 22. Comparative results are as follows: 
     
         ______________________________________                                    
Property     Specimens  Kodar A-150 Copolyester                           
______________________________________                                    
Tg, °C.                                                            
                137        87                                             
HDT, °C.                                                           
                114        71                                             
Notched Izod, Ft-lb/in                                                    
             1.1        1.4                                               
Flex. Mod., psi                                                           
             330,000    241,000                                           
Flex. Str., psi                                                           
              15,600     9,800                                            
______________________________________                                    
 
    
     EXAMPLE 25 
     The process of Example 1 is repeated substituting 60 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 40 percent by weight of Bisphenol A polycarbonate (manufactured by General Electric Company under the trademark Lexan). Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  172° C.                               
______________________________________                                    
 
    
     EXAMPLE 26 
     The procedure of Example 1 is repeated substituting 60 percent by weight polycarbonate having a 3:7 mole ratio of sulfone to bisphenol and 40 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 171° C.                                                       
             150° C.  162° C.                               
______________________________________                                    
 
    
     EXAMPLE 27 
     The procedure of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 60 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  168° C.                               
______________________________________                                    
 
    
     EXAMPLE 28 
     The procedure of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol and 60 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 171° C.                                                       
             150° C.  159° C.                               
______________________________________                                    
 
    
     EXAMPLE 29 
     The procedure of Example 1 is repeated substituting 20 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 80 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  155° C.                               
______________________________________                                    
 
    
     EXAMPLE 30 
     The procedure of Example 1 is repeated substituting 20 percent by weight of polycarbonate having a 3:7 mole ratio of sulfone to bisphenol and 80 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 171° C.                                                       
             150° C.  154° C.                               
______________________________________                                    
 
    
     EXAMPLE 31 
     The procedure of Example 1 is repeated substituting 90 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 10 percent by weight Lexan polycarbonate. Comparative results after melt admixture at about 310° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  193° C.                               
______________________________________                                    
 
    
     EXAMPLE 32 
     The procedure of Example 1 is repeated substituting 70 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 30 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 310° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  187° C.                               
______________________________________                                    
 
    
     EXAMPLE 33 
     The procedure of Example 1 is repeated substituting 55 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 45 percent by weight of Lexan polycarbonate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Lexan Polycarbonate                                          
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
             150° C.  177° C.                               
______________________________________                                    
 
    
     EXAMPLE 34 
     A physical mixture of 5 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 95 percent by weight Lexan polycarbonate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results of this Example are presented in Table II below. 
     EXAMPLE 35 
     A physical mixture of 10 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 90 percent by weight of Lexan polycarbonate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results of this Example are presented in Table II below. 
     EXAMPLE 36 
     A physical mixture of 15 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 85 percent by weight Lexan polycarbonate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results of this Example are presented in Table II below. 
     EXAMPLE 37 
     A physical mixture of 20 parts of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 80 parts Lexan polycarbonate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results of this Example are presented in Table II below. 
     
                       TABLE II                                                    
______________________________________                                    
                             Notched Izod                                 
            Tg °C.                                                 
                   HDT °C.                                         
                             ft lbs/in                                    
______________________________________                                    
Lexan Polycarbonate                                                       
              151      140       &gt;15                                      
Example 34    153      143       &gt;15                                      
Example 35    155      147       &gt;15                                      
Example 36    157      149       &gt;15                                      
Example 37    159      152       &gt;15                                      
______________________________________                                    
 
    
     EXAMPLE 38 
     The injection molded composition of Example 37 were further evaluated according to the tests for the specimens of Examples 22 and 23. Comparative results are set forth in Table III. 
     
                       TABLE III                                                   
______________________________________                                    
                LEXAN                                                     
Property        (Polycarbonate)                                           
                            Composition                                   
______________________________________                                    
Tensile Modulus, psi                                                      
                345,000     370,000                                       
Tensile Strength, psi                                                     
                9,000       9,100                                         
Yield Elongation, %                                                       
                10          7                                             
Elongation at Break, %                                                    
                110         46                                            
Flexural Modulus, psi                                                     
                340,000     396,000                                       
Flexural Strength, psi                                                    
                13,500      15,900                                        
HDT, °F. 270         305                                           
Notched Izod, Ft-lbs/in                                                   
                12          12                                            
Gardner Impact, in-lbs                                                    
                &gt;320        &gt;320                                          
______________________________________                                    
 
    
     EXAMPLE 39 
     A physical mixture of 33.3 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol, 33.3 percent by weight Lexan polycarbonate, and 33.3 percent by weight Kodar A-150 polyester are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented below: 
     
         ______________________________________                                    
       HDT, °C.                                                    
                   117                                                    
       Flex. Mod. psi                                                     
                342,000                                                   
       Flex. Str., psi                                                    
                 15,100                                                   
______________________________________                                    
 
    
     EXAMPLE 40 
     A physical mixture of 40 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 60 percent by weight of polyester carbonate (manufactured by General Electric Company under the trademark Lexan 3250) are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented in Table IV below. 
     EXAMPLE 41 
     A physical mixture of 40 percent by weight of dry polycarbonate having a 7:3 mole ratio of sulfone to bisphenol and 60 percent by weight of Lexan 3250 polyester carbonate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented in Table IV below. 
     
                       TABLE IV                                                    
______________________________________                                    
Property          Example 39                                              
                            Example 40                                    
______________________________________                                    
Tg, °C.    190       195                                           
HDT, °C.   161       176                                           
HDT, °F.   322       349                                           
Notched Izod      3.0       3.2                                           
ft-lbs/in.                                                                
______________________________________                                    
 
    
     EXAMPLE 42 
     The procedure of Example 1 is repeated substituting 40 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 10 percent by weight of a polyarylate (sold by Union Carbide Corporation under the designation Ardel D-100). Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
            Ardel D-100 Polyarylate                                       
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
            192° C.   207° C.                               
______________________________________                                    
 
    
     EXAMPLE 43 
     The procedure of Example 1 is repeated substituting 70 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 30 percent by weight of Ardel D-100 polyarylate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
            Ardel D-100 Polyarylate                                       
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
            192° C.   203° C.                               
______________________________________                                    
 
    
     EXAMPLE 44 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight of Ardel D-100 polyarylate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
            Ardel D-100 Polyarylate                                       
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
            192° C.   197° C.                               
______________________________________                                    
 
    
     EXAMPLE 45 
     The procedure of Example 1 is repeated substituting 30 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 70 percent by weight of Ardel D-100 polyarylate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
            Ardel D-100 Polyarylate                                       
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
            192° C.   196° C.                               
______________________________________                                    
 
    
     EXAMPLE 46 
     The procedure of Example 1 is repeated substituting 10 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 90 percent by weight of Ardel D-100 polyarylate. Comparative results after melt admixture at about 300° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
            Ardel D-100 Polyarylate                                       
                             Composition                                  
______________________________________                                    
Tg = 210° C.                                                       
            192° C.   193° C.                               
______________________________________                                    
 
    
     EXAMPLE 47 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight of Ardel D-100 polyarylate are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are as follows: 
     
         ______________________________________                                    
Property       Composition                                                
______________________________________                                    
HDT, °C.                                                           
                  167                                                     
Flex Mod., psi 347,000                                                    
Flex Str., psi  16,300                                                    
______________________________________                                    
 
    
     EXAMPLE 48 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 50 percent by weight of polyetherimide (manufactured by General Electric Company under the trademark Ultem). Comparative results after melt admixture at about 330° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Ultem Polyetherimide                                         
                             Composition                                  
______________________________________                                    
Tg 210° C.                                                         
             217° C.  214° C.                               
______________________________________                                    
 
    
     EXAMPLE 49 
     The procedure of Example 1 is repeated substituting 50 percent by weight of polycarbonate having a 8:2 mole ratio of sulfone to bisphenol and 50 percent by weight of Ultem polyetherimide. Comparative results after melt admixture at about 330° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Ultem Polyetherimide                                         
                             Composition                                  
______________________________________                                    
Tg = 235° C.                                                       
             214° C.  223° C.                               
______________________________________                                    
 
    
     EXAMPLE 50 
     The procedure of Example 1 is repeated substituting 30 percent by weight of polycarbonate having a 8:2 mole ratio of sulfone to bisphenol and 70 percent by weight of Ultem polyetherimide. Comparative results after melt admixture at about 330° C. are as follows: 
     
         ______________________________________                                    
Sulfone/Bisphenol                                                         
Polycarbonate                                                             
             Ultem Polyetherimide                                         
                             Composition                                  
______________________________________                                    
Tg = 235° C.                                                       
             217° C.  220° C.                               
______________________________________                                    
 
    
     EXAMPLE 51 
     A physical mixture of 25 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 75 percent by weight Udel polysulfone (P-1700, Union Carbide) are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented in Table V below: 
     EXAMPLE 52 
     A physical mixture of 75 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 25 percent by weight Victrex (I.C.I.) polyethersulfone are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented in Table V below: 
     EXAMPLE 53 
     A physical mixture of 30 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol and 70 percent by weight phenoxy resin are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented in Table V below: 
     
                       TABLE V                                                     
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EXAMPLE     FLEX. MOD., PSI                                               
                          FLEX. STR., PSI                                 
______________________________________                                    
51          388,000       17,000                                          
52          375,000       18,000                                          
53          389,000       15,800                                          
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     EXAMPLE 54 
     A physical mixture of 60 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol, 30 percent by weight poly(ethylene terephthalate), and 10 percent by weight of an acrylate based polymer called KM 330 (sold by Rohn &amp; Haas) are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented below: 
     
         ______________________________________                                    
HDT, °C.         122                                               
Flex. mod., psi         327,000                                           
Flex. str., psi         14,700                                            
Tensile. mod., psi      295,000                                           
Tensile. str., psi      8,800                                             
Notched Izod. ft-lbs/in.                                                  
                        3.8                                               
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     EXAMPLE 55 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol, 25 percent by weight poly(ethylene terephthalate), and a copolyether ester block copolymer (sold under the trade name Hytrel 5555 by E. I. du Pont de Nemours) are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented below: 
     Flex mod., psi 291,000 
     Flex strength, psi 14,250 
     EXAMPLE 56 
     A physical mixture of 50 percent by weight of dry polycarbonate having a 1:1 mole ratio of sulfone to bisphenol, 40 percent by weight poly(butylene terephthalate), and 10 percent by weight of an acrylate based polymer called KM 330 (sold by Rohm &amp; Haas) are extruder blended, injection molded, and tested for properties substantially as described in Example 22. The results are presented below: 
     
         ______________________________________                                    
Flex. mod., psi    328,000                                                
Flex. str., psi    13,300                                                 
Notched Izod ft-lbs/in.                                                   
                   11                                                     
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     Polymer Synthesis 
     The dixylenol sulfone/bisphenol A (DXS/BPA) described in the foregoing examples were prepared employing interfacial polymerization, in which a rapidly stirred two phase mixture of aqueous caustic, polymer solvent, bisphenols, a phase transfer catalyst, and monofunctional chain terminators is phosgenated. The growing polymer dissolves in polymer solvent, unreacted bisphenols dissolve in the aqueous caustic phase and the polymer forms at the interface. The polymer is isolated by precipitation in methanol and dried. The applicable technology of the synthesis of polycarbonates is described in &#34;Chemistry and Physics of Polycarbonates&#34; by H. Schnell (Interscience, 1964) 
     Preferred blends are admixtures of a polycarbonate resin including units derived from a first dihydric phenol, which is bis(hydroxyaryl)sulfone and a second dehydric phenol, and a thermoplastic which is the resin product of a condensation polymerization reaction. 
     All of the foregoing patents and/or publications are incorporated herein by reference. Obviously, other modifications and variations of the present invention are possible in the light of the above teachings. It is, therefore, to be understood that changes may be made in the particular embodiments of the invention described which are within the full intended scope of the invention as defined by the appended claims.