Photographic elements with a support comprising polymeric propylene compositions
United States Patent Venor et al.  
 Apr. 1, 1975 PI-IOTOGRAPIIIC ELEMENTS WITH A SUPPORT COMPRISING POLYMERIC PROPYLENE COMPOSITIONS Inventors: William J. Venor, Henrietta; John C. I-Ioppe, Spencerport, both of N.Y.; William W. Blount,&#39;Jr., Kingsport, Tenn.  
 Assignee: Eastman Kodak Company,  
 Rochester, NY.  
 Filed: Nov. 24, 1972 Appl. No.: 309,304  
 RELATED U.S. APPLICATION DATA Continuation-impart of Ser. No. 90,053, Nov. 16, 1970, abandoned.  
 U.S. Cl. 96/87 R, 96/67, 260/41 B, 260/878 R Int. Cl. G03c l/76 Field of Search 96/87 R, 74, 29 D, 29 R; 260/878 R, 41 B, 824 R References Cited UNITED STATES PATENTS 9/1970 Hcgemeyer, Jr. et al 260/878 FOREIGN PATENTS OR APPLICATIONS 1.090.059 12/1964 United Kingdom 260/17 Primary Examiner-Norman G. Torchin Assistant Examiner-Alfonso T. Suro Pico Attorney, Agent, or Firm-H. E. Byers [57] ABSTRACT The films or sheets prepared from these polyolefin compositions have the stiffness, opacity and printability normally associated with paper and provide excellent replacements for paper used in photographic elements. In addition, they have excellent tear strength and elongation.  
  11 Claims, No Drawings PI-IOTOGRAPHIC ELEMENTS WITH A SUPPORT COMPRISING POLYMERIC PROPYLENE COMPOSITIONS CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of US. Pat. Application Ser. No. 90,053, filed Nov. 16, 1970 in the names of Vernor, Hoppe and Blount now abandoned.  
 BACKGROUND OF THE INVENTION This invention relates to a polyolefin composition from which films may be prepared having the stiffness, opacity and printability normally associated with paper. In another aspect, the present invention is directed to polymeric sheets or films of such polyolefin compositions useful in the field of photography as, for instance, in the preparation of photographic elements and to photographic elements employing such sheets.  
  Although polymeric films which can be printed are known, they have not proved entirely satisfactory as replacements for paper. One drawback of these polymeric films has been their lack of stiffness and opacity. Another deficiency of prior art printable polymeric films is their instability. For example, British Pat. No. 1,090,059 describes a printable polymeric sheet of polyethylene-based compositions in which siliceous fillers are incorporated along with a resin such as an ethylene vinyl acetate copolymer. Other polymeric sheets have been proposed as paper substitutes made from polyvinyl chloride, polyethylene, polystyrene, and polyamide. Although sheets of these polymeric compositions exhibit many of the characteristics normally associated with paper, the sheets have been found to be liable to heat and ultraviolet light and, in addition, are degraded I by certain adhesives (e.g., animal glues containing permanent plasticizers) used in book casing and posterboard fabrication or are subject to yellowing.  
  Some sheets are made by synthetic fibers formed on a paper making machine. Others require special surface treatments such as solvent degradation to obtain a white appearance or adherence to subsequent coatings or to a printed image.  
  Polymeric sheets have also been proposed as substitutes for paper in the preparation of photographic elements containing the sheets as supports for one or more light-sensitive layers. These polymeric materials, however, have yet to display the outstanding advantages of paper or similar fibrous materials. Among the shortcomings of polymeric photographic supports are difficulties such as dimensional stability, i.e., the occurrence of dishing, fluting and edge penetration, photographic activity of components resulting in fogging, etc. In addition, major losses in sharpness occur due to the separation of the light-sensitive layers from the reflecting layers adjacent the polymeric sheets.  
  One object of the invention, therefore, is to provide polyolefin compositions capable of being formed into films and sheets which possess characteristics usually associated with paper as, for instance, stiffness, preferably having a Tensile Modulus of elasticity of above about 50,000, opacity and printability; yet retain the desirable properties of polymeric film such as high tear strength, high elongation, water-resistance, heat sealability, extrudability, ability to be laminated, etc.  
  Another object of the invention is to provide polymeric compositions capable of being formed into sheets having the desirable properties of the paper and polymeric films, yet of improved stability to ultraviolet light and heat of from about 400 to 500F.  
  Yet another object of the invention is to provide photographic elements comprised of at least one radiationsensitive layer on a photographically inert polymeric support which exhibit improved image sharpness and dimensional stability while, at the same time, exhibiting high resistance to water, temperature, wear-and-tear and abrasion.  
  A further object of the invention is to provide elements of the above type wherein the radiation-sensitive layers are silver halide emulsion layers.  
  Yet a further object of the invention is to provide photographic elements of the above type wherein the photographic support is coated with silver halide emulsion layers differentially sensitized to blue, green and red.  
  A still further object of the invention is to provide multilayer elements coated on said polymeric support wherein the siler halide emulsion layers contain colorforming couplers therein.  
  An additional object of the invention is the use of the polymeric materials as receiving sheets in diffusion transfer photographic processes.  
 SUMMARY OF THE INVENTION These and other objects of the invention are obtained with a polymeric composition comprising crystalline polypropylene or a film-forming crystalline polymer selected from the class consisting of a block copolymer of propylene with at least one other a-monoolefin selected from the group of ethylene and a-monoolefin hydrocarbons of 4 to 10 carbon atoms, identified as polyallomers as described in Hagemeyer et al US. Pat. No. 3,529,037 issued Sept. 15, 1970, mixtures of a polyallomer with crystalline polypropylene and polypropylene, having incorporated in said composition about 15 to about 40 percent, preferably 15 to 25 percent by weight talc, about 5 to about 15 percent, preferably 6 to 10 percent, by weight titanium dioxide pigment, about 5 to about 20 percent by weight of a polyolefin elastomer, and about 1/10 to about 1% by weight of a polyolefin antioxidant. The combination of titanium dioxide and talc plays an important role in achieving the aforementioned objects of the invention. Combinations of other fillers and pigments, for instance, fail to provide the desired results. Moreover, the concentrations in which the tale and titanium dioxide are employed are also important from the standpoint of obtaining the characteristics desired in the finished sheet.  
  Although about 5 to about 20 percent by weight of a polyolefin elastomer is included in the polymeric composition to obtain the tear strength and elongation of sheets or films fabricated from the composition, we prefer to use about 7 to about 12 percent by weight. In those instances where the polymeric composition is to be used for the preparation of a photographic support, it is desirable that the elastomer improve tear strength without adversely affecting photographic activity. The following polyolefin elastomers have been found to be particularly suitable for use in the invention: elastomeric copolymers of ethylene and propylene, commonly known as ethylene/propylene rubber (EPR), including ethylene/propylene terpolymers and polyisoolefin rubber.  
  Various polyolefin antioxidants can be incorporated in the polymeric composition, preferably antioxidants such as those described in Tholstrup US. Pat. No. 3,033,814, issued May 8, 1962, and the phenolic antioxidants in Tholstrup et al., US Pat. No. 3,157,517, issued Nov. 17, 1964, both patents incorporated by reference.  
  The polymeric composition of the invention is employed to form sheets which are paper-like in appearance. They are typically formed by extrusion and usually of a thickness of about 3 to about 8 mils.  
  In a photographic embodiment, the polymeric sheets of this invention which are substantially free from photographic activity, are used as supports for one or more light-sensitive coatings including silver halide, diazo, CIC.  
  The crystalline polymer components, elastomers and antioxidants useable in the invention will be discussed below under separate headings.  
 CRY STALLlNE POLYPROPYLENE The crystalline polypropylene employed in this invention is a solid, hexane-insoluble, crystalline polymer generally obtained by direct polymerization in the presence of a solid, stereospecific catalyst under polymerization conditions selected to form a polymer having at least 80 percent crystallinity. Crystalline polypropylenes usually are characterized by an inherent viscosity of at least 1, preferably at least 1.3, often up to about 3.0, as measured in tetralin at 145C., a density of at least 0.90, preferably 0.905 to 0.920 and a melt flow rate (230C., 2.16 kg.) of 0.1 to 10, preferably 0.5 to 5.0.  
  Solid, stereospecific polymerization catalysts are initially mixtures of at least two components, the first component being, for example, a halide of a transition element from the fourth to the sixth subgroups of the Periodic Table and the second component being a metal of Group I-A or 11 or aluminum, or an alloy of metals of Group l-A and/or 11 and/or aluminum, or a halide or organometallic compound of a metal of Group l-A or 11 and/or aluminum, or a complex hydride or a complex organometallic compound of boron or aluminum and a metal of Group l-A or II of the Periodic Table found in Langes Handbook of Chemistry, 8th Edition (1952), published by Handbook Publishers, inc. at pages 56 and 57, for example.  
  The transition metals included in Groups IV-B Vl-B of the Periodic Table are exemplified by metals such as titanium, zirconium, vanadium, molybdenum, chromium and the like. The transition metal halide catalyst components can be used at their maximum valence, or if desired, a reduced valency form of the halide can be employed. It is preferred to use the titaniumchlorides which can be in the form of titanium dichloride, titanium trichloride or titanium tetrachloride. Examples of other transition metal halides that can be employed in the process of this invention include titanium tetrabromide, titanium tribromide, zirconium tetrachloride, zirconium tetrabromide, vanadium trichloride, molybdenum pentachloride, chromium trichloride and the like.  
  Suitable second components which can be employed in conjunction with the transition element halides to form an effectivesolid, stereospecific polymerization catalyst include, for example, metal alkyls, metal alkyl halides and metal hydrides of aluminum of Group LA and II as well as the metals alone. The preferred com- 4 ponent is a lithium compound, as exemplified by lithium metal, lithium alkyl, lithium aluminum hydride, lithium aluminum alkyls, lithium borohydride and lithium aluminum compounds having the formula:  
 LiAll-l R wherein x and y are integers from 0 to 4, the sum of x and y is 4 and R is a hydrocarbon radical. Suitable Group I-A or II metals include sodium, potassium, lithium, zinc and the like. The alloys, halides, hydrides or organometallic compounds of these metals which can be employed include, for example, sodium amyl, potassium butyl, lithium propyl, zinc dibutyl, zinc diamyl,  
 zinc dipropyl, ethyl magnesium bromide, sodium hydride, calcium hydride, lithium aluminum hydride and the like. Also, the catalyst composition can contain an organo-aluminum compound such as aluminum triethyl, aluminum tributyl, ethyl aluminum dichloride,  
 cyclohexyl aluminum dichloride, cyclobutyl aluminum 1 dichloride, ethyl aluminum dibromide, ethylaluminum sesquichloride, ethyl aluminum sesquibromide, di-  
 methyl aluminum bromide, propyl aluminum dichloride, dibutyl aluminum chloride, diethyl aluminum:  
 chloride and the like. If desired, a third component can be employed in order to increase the stereospecificity of the catalyst. Suitable third components include the halides of alkali metals, magnesium oxide, aromatic ethers, for example, diphenyl ether, hydrides of sodium, potassium and lithium and alcoholates of sodium, potassium, lithium, calcium, magnesium, barium,  
  strontium, aluminum, titanium and zirconium. In addition, it is often desirable to employ tertiary amines and tertiary phosphoramides as third components with alkyl aluminum halides.  
  Generally, a mole ratio of second component to metal halide of 01:1 to 12:1 is satisfactory in the prac-&#39; tice of the process. Where a third component is employed, the mole ratios of metal halide to third component of 0.25:1 to about 1:1 are generally satisfactory. The concentration of the catalyst in the reaction medium can be varied over a wide range. For example, catalyst concentrations of 0.1 percent or less, up to 3 percent or more, can be used.  
 The polymerization is generally carried out in the liq- 7 uid phase at a temmperature ranging from 0 to 250C, preferably 50 to C. and a pressure ranging from atmospheric to 20,000 psi., preferably about 30 to 1,000 psi. An inert organic liquid vehicle for the polymerization reaction is preferred and the catalyst concentration employed is generally about 0.1 to 2 percent by weight of the inert organic liquid vehicle. The molar PROPYLENE POLYALLOMERS The polyallomers described herein are solid, crystalline, block copolymers synthesized from propylene and an a-monoolefin selected from ethylene and oz-monoolefins having 4-10 carbon atoms and comprise two separate and distinct crystalline segments, i.e., a body segment and a tail segment. They are prepared by polymerizing an a-monoolefin such as ethylene onto preformed crystalline segments of a polypropylene chain formed from propylene using a solid, stereospecific polymerization catalyst such as described above. A preferred catalyst is a mixture of equimolar amounts of LiAlH.,, TiCl and NaF. Another preferred solid, stereospecific polymerization catalyst, for example, is a 211:3 molar ratio of ethyl aluminum sesquichloride, hexamethyl phosphoramide and titanium trichloride.  
  One such method of preparing the polyallomers is a multi-stage polymerization procedure comprising initially polymerizing the propylene and then polymerizing ethylene onto the polymer chain of the first monomer using a solid, stereospecific polymerization catalyst. The polymerization reaction is continued until the resulting polymer contains at least 80 percent, most often at least 90 percent, by weight of polymerized propylene. The multi-stage process can be conducted in a single reactor having separate reaction zones preferably separated by a baffle or other separation means. However, the separate polymerization reactions of the multi-stage process can also be conducted in separate reactors arranged in series and, alternatively, the entire process could be carried out in an elongated tubular reactor.  
  The polyallomers can also be produced batchwise by carrying out the first stage of the polymerization with propylene and adding the ethylene after a portion of the first monomer, for example, to 30 percent, has been polymerized. However, in the preparation of the propylene polyallomers, it is preferred that the propylene be employed as a monomer in the first stage. The exact amount of monomer feed after the first stage of the reaction is subject to wide variation depending upon such variables as the reaction conditions em- I ployed, the percent of monomer converted in the first stage, the desired molecular weight of the resulting polyallomer, etc. In general, the block copolymer will have an inherent viscosity in tetralin at 145C. of about 0.4 to 2.4 and a density of at least 0.85.  
 ELASTOMERS Various elastomers may be used in the polymeric compositions of the invention. The elastomers typically are elastomeric materials which are compatible with polyolefins and have a molecular weight of from about 500 to about 10,000.  
  They can be dissolved in an organic liquid and give a continuous film when the solvent is evaporated. Particularly useful elastomers are elastomeric ethylenepropylene copolymers which may be used in the polymeric compositions such as the normally solid, ethylene/propylene rubbers. By the term ethylene/- propylene rubber,&#34; we mean copolymers of ethylene and propylene and terpolymers prepared by copolymerizing ethylene and propylene with minor amounts of a non-conjugated diene such as dicyclopentadiene or S-ethylene-Z-norbornene.  
  Ethylene propylene rubber copolymers may be prepared by copolymerizing ethylene with propylene by any of several methods such as methods described in US. Pat. Nos. 2,710,663 and 2,726,023 and Belgian Pat. Nos. 535,082, 538,782, 553,655 and 583,039. These polymers containing from about 20 to 60 mole percent, most preferably about 30 to 40 mole percent, propylene are particularly useful. Elastomeric terpolymers of ethylene, propylene and non-conjugated dienes, particularly those containing 30 to 45 percent 5-ethylene-2-norbornene, are also suitable for use in the polymeric composition. The various grades of ethylene-propylene rubber ranging in unsaturation from 0 to 5 mole percent and available commercially are satisfactory resins for the blends of this invention. Such ethylene/propylene rubbers available commercially which may be used are, for example, Enjay EPR-404, Enjay EPT-3509, U.S. Rubber Companys Royalene 502 and EPT and E. I. DuPonts Nordel.  
  Another type of elastomer suitable for use in this invention is the isoolefin rubber polymer such as poly(isobutyleneethylene) copolymer (Vistanex L-) and poly(isobutylene). The isoolefin rubber polymers may be prepared by the polymerization of an isoolefin such as isobutylene with or without other alphaolefins such as ethylene in the presence of a suitable catalyst, preferably inorganic halides, e.g., boron fluoride, at a temperature below 50C. employing the general procedure described in US. Pat. No. 2,130,507.  
  Normally the elastomer is included in the polyolefin composition in an amount of about 5 to about 20 percent by weight of the composition, preferably about 7 to about 15 percent by weight.  
  Polyurethanes can be used and are useful in improving the photooxidative resistance. Polyurethanes available commercially include Pelletane E 2l03-80D, (CPR/Upjohn), Texin 355D, (Mobay), and Estane 58092 (B. F. Goodrich).  
  Styrene-butadiene polymers are also useful, particularly styrene-butadiene-styrene-isoprene-styrene block copolymers.  
 ANTIOXIDANTS Antioxidants which are particularly useful for stabilizing polypropylene and propylene polyallomers which are substantially free of photographic activity include the N,N-dialkyl dithiocarbamates, alkyl phenyl salycilates, 2-hydroxy benzophenones or butylated hydroxy toluenes and the like can be employed with good results. Specific antioxidants which can be employed include 4,4&#39;-butylidene-bis(6-tert. butyl-meta-cresol), di-lauryl-3,3-thiodipropionate, N-butylated-p-amino phenol, 2,6-ditertiarybutyl-p-cresol, 2,6-ditertiarybutyl-4-methyl phenol, N,N-disalicylidene-l ,2- diaminopropane, cresylic acid, diacetone alcohol, isopropanol, toluene, mixed xylenes, butylated hydroxyanisole, butylates hydroxy-toluene, propyl gallate, citric acid, propylene glycol, vegatable oil, sodium silico aluminate, mixed glycerides, glyceryl monooleate, diisobutyl adipate or mixtures thereof. A particularly effective synergistic mixture is one comprising dilauryl thiodipropionate with 4,4-butylidene-bis (6-tert. butyl-meta-cresol), or butyl hydroxy toluene.  
  Antioxidants which can be used if the composition is not to be used for photographic elements having thereon a radiation-sensitive silver halide emulsion include tri normal phenyl phosphate, penta erythritol ester of tetra(3,4)-ditertiary-butyl-4-hydroxy-phenyl proprionic acid, N,N-diphenyl-p-phenylenediamines, N,N-disecondary-butyl-p-phenylenediamine, disalicylal propylene diimine, N,N&#39;-di(l-methyl heptyl)-pphenylenediamine, I I N,N-di-2-octyl-pphenylenediamine, N,N&#39;-di-3 5-methyl heptyl)-pphenylenediamine, N-l, N-3 dioleoyldiethylene triamme. v  
  Normally, the antioxidant is included in the polyolefin composition from about 1/10 to about 1 percent by weight of the composition. However, it will be appreciated that larger amounts can be used and that other antioxidants can be used in addition to those given above.  
  The tale powder employed in the present invention can be a talc having a particle size of l to 300 microns. Suitable talcs include the natural talcs (i.e., not subjected to chemical treatment) such as the magnesium and calcium silicates as well as the chemically treated talcs such as the Mistron talcs. The talc may be of any desired shape, although fibrous, scaly, platy ormica ceous, tremolitic or acicular particles are preferred. A variety of suitable talcs are commercially available and include Talc 650 (Georgia Talc), Talc 649 (Eastern Magnesia Talc), Desertalc 84 (Desert Minerals), Desertalc Mikro 706 (Desert Minerals), the various grades of Mistron talcs such as Mistron Vapor, Mistron 25, Mistron H60-55, etc.  
  The titanium dioxide can be of pigment size and typically has an average mean diameter of about 0.3 micron and a range of about 0.1 micron to 0.6 micron. Either rutile or anatase can be used. However, it will be recognized that pigment size of titanium dioxide can be used which is somewhat smaller or larger.  
  Minor amounts of other additives commonly added to polymeric compositions may also be incorporated into the compositions of the invention. Illustrative of such additives are antioxidants, ultraviolet light inhibitors, other inorganic fillers, pigments having average particle sizes of about 0.1-20a, plasticizers, colorants, brighteners, lubricants, antistatic agents, antiblocking agents and the like.  
  The polymeric compositions of the invention, moreover, preferably contain minor amounts of linear polyethylene which further enhances desired properties such as tear resistance in the sheet or film materials produced from the compositions. When employed, useful linear polyethylenes generally have a density of at least about 0.903, preferably about 0.95 to 0.97 and a melt index (190C.) of 0.1 to 20, preferably 0.5 to 10, and are usually added in amounts of about 2 to 15 percent by weight of the compositions.  
  The mixing or blending of the components of the composition of the invention may be conducted by using any of the conventional mixing apparatus such as a Banbury mixer, entruder or the like. The mixing operation may be conducted at a temperature no lower than the softening point or melting point of the polypropylene or polyallomer component and, in the case of a mixture of the components, no lower than the highest softening or melting point of the mixture.  
  The following examples are included for a further understanding of the invention. In the examples, the enduse performance of the compositions is measured in the laboratory as the Elmendorf Tear Resistance (ASTM -689-44) and Secant Modulus of Elasticity or Stiffness (ASTM D-638).  
 Example 1 A printable composition having good stiffness properties is prepared by fluxing in a Banbury mixer 786 grams (65.5 percent) crystalline polypropylene having a melt flow of 2.5 decigrams per minute and density of 0.902 and stabilized with 0.2 percent 4,4&#39;-butylidene bis(6-tert-butyl-m-creso1) plus 0.3 percent dilaurylthiodipropionate, with 108 grams (9.0 percent) of Enjays Vistalon 4608 norbornene terpolymer), grams (7.5 percent) titanium dioxide (DuPonts R), and 216 grams (18 percent) talc (Georgia Talcs Talc 650). Theproduct is then granulated and extruded into 6 mil film on a one inch M.P.M. Extruder. This film hasa secant modulus of elasticity (stiffness) of 124,000 psi. and an Elmendorf tear strength of 40 grams per mil. This film can be written upon using a ball point pen or printed upon.  
 using a rubber hand stamp with a printers ink such as IPI Speed King. The ink is rapidly absorbed so as to allow stacking of sheets without smearing.  
 Example 2 A mixed polypropylene and polyallomer printable composition having properties similar to those in Example l is made by fluxing in a Banbury mixer 29.25 pounds each of a polypropylene (melt flow 2.5 decigrams per minute and density 0.902) and a polyallomer block copolymer of propylene and ethylene having a melt flow of 2.0 decigrams per minute and a density of 0.896, both stabilized as in Example 1 with 9.0  
 pounds polyethylene (melt index 0.7 decigrams per minute and density 0.96), 5.0 pounds ethylene/propylene rubber (Enjays EPR-404), 9.0 pounds titanium dioxide pigment, 18.0 pounds talc and 0.5 pound N,N-&#39;  
 bis(2-hydroxyethy1) cocoa amine (antistatic additive).  
 The fluxed material is stripped and pelleted from a two- 1 roll mill and extruded into 6 mil film on a 3 /z-inch Royle filmline extruder.  
 Example 3 bury mixer and pelleted as in Example 2. Six mil film is extruded through a 24-inch flat die on a 1 %-inch.  
 Prodex Extruder. This film has an Elmendorf tear strength of 330 grams per mil and a secant modulus of elasticity of 80,000 psi.  
 Example 4 Books are cased in covers made with the film de scribed in Example 3. These books weighing 2 pounds,  
 4 ounces each are then subjected to a tumble test consisting of dropping them 400 times from a height of 24 inches at 16 drops per minute. An animal glue such as Swifts ZF-492 is used to bond the printable polyal lomer film to the bookback material. These books resist the normal failures found with many plastic covers such as splitting along the edges and loss of adhesive to plastic bond. The adhesive does not adversely affect the polyallomer film in that it does not become embrittled or discolor.  
 Example 5 Samples of film prepared in Example 3 are subjected to ultraviolet light exposure in an Atlas Weather- Ometer. These samples resist discoloration and embrittlement for 450 hours as compared with only hours (ethylene/propylene-S-ethylene- 2- to failure found for a material, disclosed in British Pat.  
  No. 1,090,059. The incorporation of an ultraviolet inhibitor, 2-hydroxy-4-dodecyloxybenzophenone, triples the time for failure of this polyallomer composition. At 150C. in a dry air oven, samples of film described in Example 1 do not show visible evidence of oxidation for 150 hours as compared with less than 50 hours for the competitive sheet.  
 Example 6 Six mil samples of film described in Example 2 are found to heat seal at 155 to 165C. When tested in an lnstron tester at jaw speeds of 2 to 20 inches per minute, the resulting seal does not separated before the specimen breaks.  
  Sheets or webs formed from the polymeric compositions of this invention can be used as supports for photographic emulsions, particularly emulsions which result in coatings which are free from cracking when the support is flexed.  
  Particularly good results are achieved when the silver halide emulsions are dispersed in polymers of the type disclosed in Smith French Pat. No. 1,510,222; Ream et al US Pat. No. 3,287,289; or Dykstra U.S. Pat. No. 3,411,911.  
  Photographic silver halide emulsions, preparations, addenda, processing and systems which can be used with the sheets or webs of this invention are disclosed in Product Licensing Index, Vol. 92, December 1971, publication 9232, pages 107-1 10, paragraphs I-lX and Xl-XXV.  
  Example 7 The polyolefin compositions identified in Table I below are extruded through a flat and tubular die into photographic supports.  
 The film supports described in Table I below are coated with a silver chlorobromide (15 mole percent chloride) emulsion at mg of silver/ft? To the emulsion is added the cyan coupler prepared similar to that described in Example 4 of US. Pat. No. 2,801,171, hereby incorporated by reference. The coated emul- 20 sions are then processed by a standard Kodak color development process for color print material, Ektaprint C. The following physical and photographic results (using red light exposure) are obtained. The following examples describe the composition of said supports.  
 TABLE 1 BLOCK COPOLYMERS Film Poly- Poly- No. propylene ethylene Elastomer T102 Ta1c&#34;&#34; Other additives &#34;/1 Type &#34;/1 &#34;/1 71 Type A 57.65 7.5 9.0 Vistalon 4608&#34; 7.5 18.0 0.1 Antioxidant 0.25 Antistatic Agent&#34; 57.65 7.5 9.0 ERP-404 7.5 18.0 0.1 Antioxidant 0.25 Antistatic Agent&#34; C 57.65 7.5 9.0 Vistanex L- 7.5 18.0 0.1 Antioxidant 0.25 Antistatic Agent D 57.65 7.5 9.0 EPT-3509&#34; 7.5 18.0 0.1 Antioxidant&#34; 0.25 Antistatic Agent&#34; 5765 7.5 9.0 Royalene 502&#34; 7.5 18.0 0.1 Antioxidant 0.25 Antistatic Agent&#34; &#39;a terpolymer of propylene. ethylene and 5-ethy1ene-2-norhornene &#39;ethylene/propylcne ruhher (Enjay) &#34;&#34;po1y(isohulylene-ethylene1 ruhhcr &#34;ethylene/propylene rubber &#34;&#34;cthylene/propylene ruhher (LBSv Royal) &#34;&#34;4.-l&#39; hutadiene his-2-trihutyl-5-methyl phenol hu (71antistatic agent (glycerol monoand di-stearatel &#34;&#34;Talc 650 essentially magnesium silicate Length &amp; Cross Basic Wt.  
  Folds Caliper mils lbs/1,000 ft Emulsion Emulsion Emulsion Coating Coated Raw Coated Raw Coated Raw No. Film No. Support Support Support Support Support Support 1 A (flat) 15,000+ 15,000+ 4.98 4.81 26.95 26.75 2 A (tubular) 15,000+ 15,000+ 5.72 5.47 31.77 30.34 3 B (fiat) 15,000+ 15,000+ 5.20 5.25 28.42 27.53 4 B (tubular) 15,000+ 15,000+ 6.36 5.18 34.38 35.41 5 C (flat) 15,000+ 15,000+ 5.30 4.17 26.89 21.91 6 C (tubular) 15,000+ 15,000+ 5.70 5.88 30.58 31.30 7 D (flat) 15,000+ 15,000+ 4.78 4.60 25.36 4.07 8 D (tubular) 15,000+ 15,000+ 6.05 6.10 33.21 32.57 9 E (flat) 15,000+ 15,000+ 4.75 4.65 25.21 25.22 10 E (tubular) l5.000+ 15,000+ 6.03 6.09 32.25 33.71  
 Modulus of Elasticity kgll /z Humidity Tests Weather-Ometer Stretch 15 mm Elmendorf Tear Grams Size Change in Percent Test- (No. of Strip of Force to Tear Sheet Raw Support Coated Su port days required Emulsion Coated 20/r-70&#39;/1 7071-207r 20&#39;%70&#39;/1 071-2071 for embrittlement) Coutmg Coated Raw Raw Sup ort Support Rel. Rel. Rel. Rel. Raw 7 Coated No. Support Support Length ross Length Humidity Humidity Humidity Humidity Support Support 1 2.22 4.04 197 177 115 .0371 .0171 .2771 .067: 8 l2 2 3.24 2.92 155 119 130 .03 .01 .14 .06 ok at 9 12 3 2.14 4.11 192 145 128 .03 .0l .23 .19 9 9 4 3.66 2.96 153 114 133 .02 .01 .20 .13 9 12 5 2.53 5.21 79 100 72 .02 .02 .18 .09 7 12 6 3.90 4.07 70 96 64 .03 .0l .13 .03 8 l2 7 1.67 4.14 140 102 114 .05 .01 .25 .18 9 l2 8 3.19 2.29 161 117 130 .03 .01 .15 .08 ok m9 12 9 1.76 3.84 113 107 86 .06 .01 .19 .16 9 12 10 3.15 2.63 138 117 134 .01 .0l .16 .10 8 12 C N D Fresh lngubation Week) and 3,000 ml. of water and enough photographic gelatin to have a total of 118 g per mole of silver halide. 1 .13 1.69 .14 1.73 This solution is coated so as to obtain 161mg per 3 -12 square foot of gelatin, 200 mg per square foot of cou- 4 pler, and 150 mg per square foot of silver. 2 1 2; 1 6. Topcoat layer To 4,540 g of a 10 percent photo-. 7 :2 graphic gelatin solution is added 250 g of ultraviolet ab- 8 .13 1.70 .14 1.74 sorbing compound, 5-(4-methoxy-3-sulfo)-1 g :19; :13 :23 benzylideneQ-phenylimino-3-octylthiazolidone so- 25 dium salt in 5,000 ml of water. This solution is coated to obtain 91 mg per square foot of gelatin and 50 mg; per square foot of the ultraviolet absorbing compound. Exampie 8 The silver bromoiodide emulsions utilized are of the Multilayer photographic elements suitable for use in preparing three-color diffusion transfer images are prepared by coating the polymeric support sheets described in Example 7 with a plurality of layers as described in Example 1 of US. Pat. No. 3,330,655, hereby incorporated by reference, numbered in sequence from the support, as follows:  
  1. Red-sensitive layer To one mole of a melted direct positive silver bromoiodide emulsion that has been red-sensitized, is added 108 g. of cyan coupler XX in 2,500 ml. of water and enough photographic gelatin to make a total of 139 g. per mole of silver halide. This solution is then coated so as to obtain 193 mg per square foot of gelatin, 150 mg per square foot of coupler, and 150 mg per square foot of silver.  
  2. lnterlayer To 4,540 g of a 10 percent photographic gelatin solution is added 250 g of the antioxidant, 2-octadecyl-4-sulfohydroquinone potassium salt, in 5,000 ml of hot water. This is coated to obtain 91 mg per square foot of gelatin and 50 mg per square foot of the antioxidant.  
  3. Green-sensitive layer To one mole ofa melted di rect positive silver bromoiodide emulsion that had been green-sensitized, is added 81 g of magenta coupler XXXVII in 3,000 ml of water and enough photographic gelatin to have a total of 162 g per mole of silver halide. This solution is coated so as to obtain 180 mg per square foot of gelatin, 90 mg per square foot of coupler, and 120 mg per square foot of silver.  
  4. lnterlayer To 4,540 g of 10 percent photographic gelatin solution is added 250 g of the antioxidant used in layer 2 in 5,000 ml of hot water and 4.0 g of yellow Carey Lea silver as a dispersion. This solution is then coated to obtain 91 mg per square foot of gelatin, 50 mg per square foot of antioxidant, and 8 mg per square foot of Carey Lea silver.  
  5. Blue-sensitive layer To one mole of a melted direct positive silver bromoiodide emulsion that is inherently blue light-sensitive is added 144 g of coupler XLVI that has been dissolved in 750 ml of ethyl alcohol type described in Davey et al, US. Pat. No. 2,592,250 wherein the silver halide grains have high internal sensitivity and low surface sensitivity. Test samples of the prepared photographic elements are then exposed for 1/10 second with a 500-watt positive lamp and a 4.08  
 Corning filter on an. Eastman Type 18 intensity scale. sensitometer, thereafter immersed in a color developing composition for 30 seconds at F. and then&#39; pressed in contact with a receiving sheet which is com-.  
 posed of the polymeric sheet described in Example 7 above having coated thereon a hydroxyethyl-2-(octadecylamido)-proypl ammonium dihydrogen phosphate mordant in gelatin. Removal of the receiving sheets shows excellent positive images on the receiving sheets.  
 Color Developing Composition 4-amino-N-eth l-N-( -h drox eth l)-aniline 20.0 sodium hydroxide B y y y g 15.0 dihydroxylamine oxalate g 1.0 benzotriazole g 0.1 6 dimethyl sulfoxide cc 25.0 p-[B-(methylsulfonamido)ethyllphenyl hydrazine g 0.3  
 water to make one liter Examples 9 15 The polyolefin compositions identified in Table2 below are extruded into 6 mil film supports on a 3 /2 g scribed in Example 7. Table 2 describes the composi 1 tions of these supports, and illustrated results obtained using test methods similar to those employed in Table l.  
 dimethyl-B- &#39;TABLE 2 Example Other Number Polypropylene. 7r Polyethylene. 7r Elastomer (l) TiO 71 Talc, &#39;7( I Additives Weather-Ometer Test Raw Support&#34; (Raw Support) Example Modulus of Elasticity Elmendorf Tear Grams No. of Days Required No. (Kg/17: Stretch 15 mm Strip) of Force to Tear Sheet For Embrittlement length cross 9 4.30 184 152 8 l Terpolymer of propylene. ethylene and S-ethylenc-Z-norhornene. sold under the tradenamc Vistalon 4608. (2) Contains 0.15; of an antioxidant, as described in Example 7 and 0.25% of an antistatic agent containing glycerol mono and di-stearate, sold under the tradename Tcgin 515.  
 Example 16 sample of polyallomer and a sample of crystalline polypropylene as described in Example 1 are each prepared having 15 percent titanium dioxide and 18 percent talc, the resulting 5 mil sheets are found to be stiff and brittle.  
 Example 17 Samples described in Examples 9-15 prepared without antioxidants and tested .in the Weather-Ometer become embrittled at 120 hours.  
 Example 28 A sample of crystalline polypropylene as described in Example 1 and a sample of polyallomer as described in Example 3 of l-lagemeyer et a1 U.S. Pat. No. 3,529,027 are prepared with titanium dioxide having more than 15 percent by weight. The polymers are extruded with difficulty as the amount of titanium dioxide is increased and lack cohesion so that the resulting film is not continuous. Using less than 5 percent by weight results in loss of opacity and reflectance.  
  In similar samples with talc and without titanium dioxide, when the amount of tale is varied below about 15 percent by weight, the opacity is decreased whereas increasing the talc above about 40 percent by weight affects the extrudability of the polyolefin. Both talc and titanium dioxide are required to provide the desired printability, opacity, reflectance and extrudability of the polyolefin compositions.  
  The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.  
 We claim:  
  1. A photographic element comprising a photographic support coated with at least one layer of a lightsensitive silver halide emulsion, said support being formed from a composition comprising i A. a film-forming crystalline polymer containing at least percent by weight of polymerized propylene, selected from the class consisting of:  
 1. a block copolymer of propylene with at least one other a-monoolefin selected from the group of a. ethylene, and b. a-monoolefin hydrocarbons of 4 to 10 carbon atoms;  
 2. mixtures of crystalline polypropylene and said block copolymer; and  
 3. polypropylene;  
 B. about 15 to about 40 percent by weight talc;  
 C. about 5 to about 15 percent by weight titanium dioxide pigment;  
 D. about 5 to about 20 percent by weight of a polyolefin elastomer; and  
 E. about l/10 to about 1 percent by weight of a polyolefin antioxidant.  
  2. The photographic element of claim 1 wherein said tale is present in an amount of about 15 to 25 percent by weight.  
  3. The photographic element of claim 1 wherein said elastomer is selected from the group consisting of ethylene/propylene rubber and an isoolefin rubber polymer.  
  4. The photographic element of claim 1 wherein said elastomer comprises a propylene-ethylene-S-ethylene- 2-norbornene terpolymer.  
  5. The photographic element of claim 1 wherein said elastomer comprises a copolymer of isobutylene and ethylene.  
  6. The photographic element of claim 1 wherein said composition comprises an ultraviolet light inhibitor.  
  7. The photographic element of claim 1 wherein the silver halide emulsion is spectrally sensitized.  
  8. A photographic element of claim 1 in which said emulsion is a direct-positive emulsion.  
  9. A photographic element of claim 1 in which said emulsion contains a color-forming coupler.  
  10. A photographic element of claim 1 having coated on said support:  
 1. a silver halide emulsion layer being a blue sensitive layer containing an incorporated yellow-forming coupler,  
 2. a silver halide emulsion layer being a red sensitive layer containing an incorporated cyan-forming coupler and 3. a green sensitive layer containing a magentaforming coupler.  
 11. A photographic element comprising a photographic support coated with at least one layer of a lightsensitive silver halide emulsion, said supportbeing.  
 formed from a composition comprising A. a film-forming crystalline block copolymer of propylene containing at least percent by weight of polymerized propylene, with at least one other olefin antioxidant.  
  PAGE 1 UNITED STATES PATENT AND TRADEMARK OFFICE (IERTTFTQATE GP (IQRREQ&#39;HQN PATENT NO. 1 3,87 r,88O DATED Ap i 975 INVENTOMS) William J. Venor, John C. Hoppe, and  
 William W. Blount, Jr,  
  It is certrfred that error appears in the above-rdentifred patent and that said Letters Patent are hereby corrected as shown below:  
 Column 1, line 9, &#34;Vernor&#34; should read --Venor--. Line 3M, &#34;liable&#34; should read -labile-.  
 Column 2, line 21, &#34;siler&#34; should read -silver.  
 Column 3, line 66, of Group should read -or Group-.  
 Column L, line M5, &#34;temmperature&#34; should read temperature--. Line 52, &#34;halaide should read -halide.  
 Column 6, lines 50-32, should read -particularly styrene-butadiene-styrene and styrene-isoprene-styrene block copolymers.-. Line U9, &#34;butylates&#34; should read ---buty1ated- Line 50, &#34;vegatable&#34; should read --vegetable.  
 Column 7, line +7, &#34;entruder&#34; should read Column 8, line 38, &#34;350]EPT&#34; should read 3509 EPT Column 9, line 15 se arated should read ---separate.  
 igned and gealed this ninth D ay 0f September 1 9 75 [SEAL] A ttest:  
 RUTH C. MASON C. MARSHALL DANN (rmzmissrmrcr oj&#39;ParenIs and Trademarks Arresting Officer PAGE 2 Ul -IETED STATES PATENT AND TRADEMARK OFFICE QERTEHQATE @F @QRREQ&#39;HQN PATENT NO, 3 87 5880 UATEU 1 April 1 1975 g qg William J. Venor, John C Hoppe, and  
  William W; Blount Jra It is certified that error appears in the above-identified patent and that said Letters P tent are hereby corrected as shown baiow:  
 Columns 9 and 10, in the footnote of Table I, delete &#34;hu before line (7) a Column l2 line 39 &#34;proypl&#34; should read -propyl-, Line 65, illustrated&#34; should read --illustrates Column 13, line M7, Example 28&#34; should read -Example l8 gignrd and geaied this oi Seplember1975 ninth A ties at