according to the first aspect of the invention , there is provided a thermoplastic resin composition which comprises : 100 parts by weight of a mixture of from 10 to 90 wt % of a polyarylate - based resin containing not less than 70 wt % of a polyarylate resin component and , correspondingly , from 90 to 10 wt % of a polyamide - based resin containing not less than 70 wt % of a polyamide resin component ; and from 0 . 1 to 15 parts by weight of an epoxy resin of the following general formula ## str4 ## wherein x represents a direct bond , a lower alkylene group having from 1 to 4 carbon atoms , ## str5 ## -- so 2 --, -- o --, or -- s -- wherein part or all of the hydrogen atoms of x may be substituted with a halogen atom if x represents any hydrocarbon defined above , r &# 39 ; s independently represent a hydrogen atom , a halogen atom , or a lower alkyl group having from 1 to 4 carbon atoms , and n is an integer of 1 to 20 . the polyarylate - based resin used in the present invention should contain not less than 70 wt % of a polyarylate resin component which is prepared from a bisphenol and / or its derivative , terephthalic acid and / or its derivative and isophthalic acid and / or its derivative and consists of these three ingredients . the derivatives of terephthalic acid and isophthalic acid include acid halide compounds such as terephthalic acid dichloride , isophthalic acid dichloride and the like , and diester compounds such as dimethyl terephthalate , dimethyl isophthalate , diphenyl terephthalate , diphenyl isophthalate and the like . terephthalic acid , isophthalic acid and derivatives thereof may be substituted , at part or all of the hydrogen atoms of the phenylene group , with a halogen atom or a lower alkyl group . the bisphenols and derivatives thereof are represented by the following formula [ 2 ] ## str7 ## wherein y represents a lower alkylene group having from 1 to 4 carbon atoms , ## str8 ## -- so 2 --, -- o --, -- s -- or ## str9 ## wherein part or all of the hydrogen atoms in y , if any , may be substituted with a halogen atom , and r &# 39 ; s independently represent a hydrogen atom , a halogen atom or a lower alkyl group having from 1 to 4 carbon atoms . examples of the bisphenols of the formula [ 2 ] include 2 , 2 - bis ( 4 - hydroxyphenyl ) propane , bis ( 4 - hydroxyphenyl ) methane , 4 , 4 &# 39 ;- dihydroxydiphenyl ether , bis ( 4 - hydroxyphenyl ) sulfide , bis ( 4 - hydroxyphenyl ) sulfone , bis ( 4 - hydroxyphenyl ) ketone , bis ( 4 - hydroxy - 3 - methylphenyl ) methane , bis ( 4 - hydroxy - 3 , 5 - dibromophenyl ) methane , 1 , 1 - bis ( 4 - hydroxyphenyl ) ethane , 2 , 2 - bis ( 4 - hydroxy - 3 - methyl - phenyl ) propane , 2 , 2 - bis ( 4 - hydroxy - 3 , 5 - dimethylphenyl ) propane , 2 , 2 - bis ( 4 - hydroxy - 3 , 5 - dichlorophenyl ) propane , 2 , 2 - bis ( 4 - hydroxy - 3 , 5 - dibromophenyl ) propane , 2 , 2 - bis ( 4 - hydroxyphenyl ) butane , bis ( 4 - hydroxyphenyl ) phenylmethane , bis ( 4 - hydroxyphenyl ) diphenylmethane , bis ( 4 - hydroxyphenyl ) difluoromethane and the like . of these , 2 , 2 - bis ( 4 - hydroxyphenyl ) propane which is usually called bisphenol a is preferred because of the ease in availability of starting materials . if necessary , a small amount of aromatic dihydroxy compounds such as , for example , 4 , 4 &# 39 ;- biphenol , 2 , 6 - naphthalenediol , hydroquinone , chlorohydroquinone and the like , may be used in combination with the bisphenols . the polyarylate resins may be prepared by any methods including an interfacial polymerization method , a solution polymerization method and a melt polymerization method . the polyarylate - based resins containing components other than the above - described polyarylate resin components include the following mixtures and such polyarylate - based resins are , of course , within the scope of the invention provided that the polyarylate resin component consisting of the aforesaid three ingredients is contained in amounts not less than 70 wt %. mixture of the polyarylate resin and the polysulfone resin of the recurring units of the following formula ## str10 ## mixture of the polyarylate resin and the polycarbonate resin of the recurring units of the following formula ## str11 ## mixture of the polyarylate resin and the polyphenylene sulfide of the recurring units of the following formula ## str12 ## mixture of the polyarylate resin and the polyphenylene oxide resin of the recurring units of the following formula ## str13 ## mixture of the polyarylate and the polyether sulfone of the recurring units of the following formula ## str14 ## mixture of the polyarylate resin and a polyether ether ketone resin . moreover , resins obtained by copolymerizing , aside from the bisphenol , terephthalic acid and isophthalic acid ( and derivatives thereof ), aromatic dicarboxylic acids , such as polyethylene terephthalate , 2 , 6 - naphthalenedicarboxylic acid and 4 , 4 &# 39 ;- diphenyldicarboxylic acid , and derivatives thereof , and aromatic hydroxycarboxylic acids , such as paraacetoxybenzoic acid and 2 - hydroxy - 6 - naphthoic acid , and derivatives thereof may also be used as the polyarylate - based resin when these resins contain not less than 70 wt % of a polyarylate resin component consisting of the above three ingredients . the polyamide resins used in the present invention are those of the following general formula , ## str15 ## wherein r 1 , r 2 and r 3 are independently an alkylene group having from 2 to 16 carbon atoms , and are prepared by condensation reaction between diamines and dibasic acids , self - condensation of amino acids , or ring opening polymerization of lactams . for instance , there can be mentioned nylon 6 prepared from ε - caprolactam or ε - aminocaproic acid , nylon 6 - 6 prepared from hexamethylenediamine and adipic acid , nylon 6 - 10 prepared from hexamethylenediamine and sebacic acid , nylon 6 - 12 prepared from hexamethylenediamine and dodecanoic acid , nylon 11 prepared from ω - aminoundecanoic acid , nylon 12 prepared from ω - laurolactam or ω - aminododecanoic acid , nylon 4 - 6 prepared from 1 , 4 - diaminobutane and adipic acid , and the like . in view of the easy availability of the starting materials , nylon 6 and nylon 6 - 6 are preferred . the polyamide - based resin is intended to mean those which contain not less than 70 wt % of the above - indicated polyamide resin or resins . for instance , there are mentioned so - called high impact nylons including blends of polyolefins and / or modified polyolefins with the polyamide resins , and those obtained by graft copolymerizing ( meth ) acrylic ester copolymers to the polyamide resins ( japanese patent publication no . 44 - 29262 ), and polyamide elastomers obtained by block copolymerization of polytetramethylene glycol with the polyamide resins . the modified polyolefins are obtained by copolymerization of olefins with α , β - unsaturated carboxylic acid or esters thereof , glycidyl ethers and metal salt derivatives , and by copolymerization or graft copolymerization of acid anhydrides . for example , there are mentioned ionomer resins obtained by ionizing ethylene - methacrylic acid ( or ester ) copolymers with na , zn , mg or the like , modified epdm obtained by graft copolymerizing ethylene - propylene - diene copolymers with maleic anhydride , those obtained by graft copolymerizing polypropylene or polyethylene with maleic anhydride , and ethylene - glycidyl methacrylate - vinyl acetate copolymers and styrene - maleic anhydride - acrylate copolymers . moreover , polymer blends of the polyamides with other resins such as abs resins , acrylate copolymers , rubber - modified styrene - maleic anhydride copolymers and polyphenylene ethers are also usable as the polyamide - based resin used in the present invention provided that the polyamide component is contained in amounts not less than 70 wt %. the epoxy resin used in the present invention is represented by the following general formula [ 1 ] ## str16 ## wherein x represents a direct bond , a lower alkylene group having from 1 to 4 carbon atoms , ## str17 ## -- so 2 --, -- o --, or -- s -- wherein part or all of the hydrogen atoms of x may be substituted with a halogen atom if x represents any hydrocarbon defined above , r &# 39 ; s independently represent a hydrogen atom , a halogen atom , a lower alkyl group having from 1 to 4 carbon atoms , and n is an integer of 1 or over . this epoxy resin is obtained by a bisphenol and an epihalorohydrin such as epichlorohydrin . examples of the bisphenol are those set forth with respect to the polyarylate resin . of these , 2 , 2 - bis ( 4 - hydroxyphenyl ) propane or bisphenol a is preferred because of the ease in availability of the starting materials . in the formula [ 1 ], n which indicates the number of the repeating units in the formula should be 1 or over . if n is equal to zero , the adverse influence of the terminal epoxy group is apt to develop , with the tendency that the resultant resin composition is gelled , colored or decomposed . especially , the melting temperature and viscosity increase considerably and thus , the molding becomes difficult . in order to bring out the effect of satisfactorily improving the impact strength , it is preferred that the terminal epoxy groups and the repeating polyether polyol units are present at an appropriate ratio . in this sense , a preferred range of n is from about 6 to 20 . a preferred range of epoxy equivalents is from about 1000 to 3000 for bisphenol a - type epoxy resins . the epoxy resins used in the present invention may contain , as copolymerized , a small amount of diols other than bisphenols , including aromatic diols such as 2 , 6 - naphthalenediol , hydroquinone and the like , and aliphatic diols such as 1 , 4 - butanediol , propylene glycol , ethylene glycol and the like . once again , the polyarylate - based resin and the polyamide - based resin used in the present invention should , respectively , contain a polyarylate resin component and a polyamide resin component in amounts not less than 70 wt %. if the content is less than 70 wt %, either or both of good impact strength and heat resistance to be imparted with the polyarylate - based resin will be lost , and either or both of good moldability and solvent resistance to be imparted with the polyamide - based resin will be lost . eventually , one or more of the impact strength , heat resistance , moldability and solvent resistance which are the characteristics inherently imparted to the resin composition of the invention will be lowered . with regard to the contents of the polyarylate - based resin and the polyamide - based resin , the former resin should be used in an amount of from 10 to 90 wt % and the latter resin should be used correspondingly in an amount of from 90 to 10 wt %. if great importance is placed on the heat resistance and impact strength , the polyarylate - based resin should be used in larger amounts . in contrast , if great importance is placed on the moldability , the polyamide - based resin should be used in larger amounts . in order to attain well - balanced heat resistance , impact strength and moldability properties , the compositional ratio should preferably be from 30 to 60 wt % of the polyarylate - based resin and from 70 to 40 wt % of the polyamide - based resin . the amount of the epoxy resin should be in the range of from 0 . 1 to 15 parts by weight per 100 parts by weight of the mixture of the polyarylate - based resin and the polyamide - based resin . if the amount is less than 0 . 1 part by weight , the impact strength is not improved satisfactorily . over 15 parts by weight , not only the resultant resin composition lowers in heat resistance , but also the melting temperature and viscosity increase , thus making molding operations difficult . preferably , the amount is in the range of from 2 to 10 parts by weight . for the production of the composition according to the first aspect of the invention , any method of melt kneading the polyarylate - based resin , polyamide - based resin and epoxy resin may be used without limitation . for instance , the melt kneading may be carried out by use of a two - roll mill , banbury mixer , single - screw extruder , twin - screw extruder and the like . alternatively , while kneading in an injection molding machine , the composition may be molded . preferably , the single or twin - screw extruder of the high kneading type is used for kneading and molding . the kneading order of the respective ingredients for obtaining the composition of the first aspect of the invention is not critical . preferably , the ingredients of the three components are added in the same time . additives and / or fillers may be further added to the resin composition of the invention . the additives may be antioxidants and thermal stabilizers such as copper halides , hindered phenols and the like , phosphorus working stabilizers , benzotriazole and hindered amine light stabilizers , plasticizers such as paraffins , higher fatty acids and esters thereof , metal salts and the like , lubricants such as silicone resins , fluorine resins and the like , flame retardants such as decabromodiphenyl ether , tetrabromobisphenol a , tetrachlorobisphenol a , aluminium hydroxide , antimony trioxide , ammonium phosphate , tricresyl phosphate , triethyl phosphate and the like , pigments , dyes and the like . the fillers may be talc , calcium carbonate , mica , wollastonite , ferrite , magnet powder of rare earth elements , glass fibers , carbon fibers , asbestos fibers , metallic fibers , aramide fibers , potassium titanate whiskers , and the like . according to the second aspect of the invention , there is provided a thermoplastic resin composition which comprises 100 parts by weight of a resin mixture consisting essentially of not less than 10 wt % of a polyarylate resin , not less than 20 wt % of a polyamide resin and from 3 to 60 wt % of a polyethylene terephthalate resin , and from 0 . 1 to 15 parts by weight of an epoxy resin of the following formula ## str18 ## wherein x represents a direct bond , a lower alkylene group having from 1 to 4 carbon atoms , ## str19 ## -- so 2 --, -- o --, or -- s -- wherein part or all of the hydrogen atoms of x may be substituted with a halogen atom if x represents any hydrocarbon defined above , r &# 39 ; s independently represent a hydrogen atom , a halogen atom , a lower alkyl group having from 1 to 4 carbon atoms , and n is an integer of 1 to 20 . the polyarylate resin , polyamide resin and epoxy resin used in the second aspect of the invention are , respectively , those defined in the second aspect of the invention . the polyethylene terephthalate resin used in the second aspect of the invention is one which is prepared , by any known technique , from terephthalic acid and / or its derivative and ethylene glycol . the polyarylate resin , polyethylene terephthalate resin and polyamide resin are , respectively , used in amounts of not less than 10 wt %, from 3 to 60 wt %, and not less than 20 wt %, each based on the total amount of these three resins . if the amount of the polyarylate resin is less than 10 wt %, the heat resistance and impact strength of the resultant resin composition become low . if the amount of the polyamide resin is less than 20 wt %, the moldability and solvent resistance are lowered . if the amount of the polyethylene terephthalate resin is less than 3 wt %, the moldability and rigidity ( modulus of elasticity ) of the resultant composition are lowered . over 60 wt %, the heat resistance and impact strength are lowered . an increasing amount of the polyarylate component results in an increase in the impact strength and heat resistance of the resultant composition . when the polyamide component increases in amount , better moldability and solvent resistance are obtained . if the polyethylene terephthalate component increases in amount , the moldability becomes better with an increase in rigidity . a preferable composition capable of imparting well - balanced properties such as heat resistance , impact strength , moldability , rigidity and solvent resistance comprises from 15 to 45 wt % of the polyarylate resin , from 45 to 65 wt % of the polyamide resin , and from 7 to 35 wt % of the polyethylene terephthalate . the amount of the epoxy resin is generally in the range of from 0 . 1 to 15 parts by weight per 100 parts by weight of the mixture of the polyarylate resin , polyamide resin and polyethylene terephthalate resin . if the amount is less than 0 . 1 part by weight , the impact strength is not improved satisfactorily . over 15 parts by weight , the resultant composition lowers in heat resistance , and the melting temperature and viscosity increase , making it difficult to mold such a composition . a preferable amount is in the range of from 2 to 10 parts by weight . for the production of the composition according to this aspect , any technique of kneading the polyarylate resin , polyamide resin , polyethylene terephthalate resin and epoxy resin may be used without limitation . favorable kneading and molding machines are those described with respect to the first aspect of the invention . the kneading order for obtaining the composition according to the second embodiment of the invention is not critical . for instance , the polyarylate , polyamide , polyethylene terephthalate and epoxy resin may be simultaneously kneaded . alternatively , two or more of the four components may be first kneaded , to which the other components are subsequently added . the optimum kneading order is such that the polyarylate and polyethylene terephthalate are first melt kneaded , followed by melt kneading the mixture , polyamide and epoxy resins . as a matter of course , any additives and fillers as described with reference to the first aspect may be added to the resin composition of the second aspect of the invention . the present invention is more particularly described by way of example , which should not be construed as limiting the present invention . comparative examples are also shown . first , starting materials used in the examples and comparative examples are illustrated . par - 1 : polyarylate resin obtained from a 1 : 1 mixture of terephthalic acid and isophthalic acid and bisphenol a ( u - polymer u - 100 , available from unichika co ., ltd .). the inherent viscosity was 0 . 65 when determined using a solvent of phenol and tetrachloroethane at a ratio by weight of 60 : 40 at a concentration of 0 . 25 g / dl at 23 ° c . par - 2 ˜ 6 : mixtures of 80 parts by weight of the polyarylate resin of par - 1 and 20 parts of the respective resins indicated below which were melt kneaded by the use of a twin - screw extruder at a cylinder temperature of 300 to 360 ° c ., thereby obtaining par - 2 , par - 3 , par - 4 , par - 5 and par - 6 , respectively . par - 2 : mixture with a polyphenylene sulfide resin ( riton , available from philips chem . co ., ltd .). par - 3 : mixture with a polyether ether ketone ( victrex 450g , available from sumitomo chemical industries , limited ). par - 4 : mixture with a polyether sulfone ( victrex 4100g , available from sumitomo chemical industries , limited ). par - 5 : mixture with polysulfone ( udel p - 1700 , available from amoco chemical inc .). par - 6 : mixture with a wholly aromatic liquid crystal polyester obtained from 2 - hydroxy - 6 - naphthoic acid and 4 - hydroxybenzoic acid ( vectra a - 950 , available from polyplastics inc .). par - 7 : polyarylate - based resin having the following structure and obtained by melt polymerization bisphenol a diacetate , terephthalic acid , isophthalic acid and paraacetoxybenzoic acid according to the process disclosed in u . s . pat . no . 4 , 075 , 173 . ## str20 ## the inherent viscosity was 0 . 68 as determined in the same manner as with par - 1 . par - 8 : the polyarylate - based resin having the following structure was prepared by copolymerization of polyethylene terephthalate ( inherent viscosity of 0 . 72 ) according to the process disclosed in japanese laid - open patent application no . 48 - 88193 . ## str21 ## the inherent viscosity was 0 . 70 as determined in the same manner as with par - 1 . pa - 3 : obtained by melt kneading 80 parts by weight of nylon 6 used as pa - 1 and 20 parts by weight of ethylene - acrylate - maleic anhydride copolymer ( bondine lx4110 , available from sumika cdf chem . co ., ltd .) by the use of a twin - screw extruder at a cylinder temperature of 240 ° c . __________________________________________________________________________cp - 1 to cp - 6 : epoxy resins ( available ) from dainippon ink and chemicals , inc .). ## str22 ## __________________________________________________________________________ epoxy approximate melting pointabbreviation commercial name equivalent * number of n (° c . ) __________________________________________________________________________cp - 1 epichlon 840 180 n ≅ 0 liquid ( 900 poises at 25 ° c .) cp - 2 epichlon 1050 450 n ≅ 2 70cp - 3 epichlon 4050 955 n ≅ 5 - 6 102cp - 4 epichlon 7050 1809 n ≅ 12 130cp - 5 epichlon 9055 2600 n ≅ 17 152cp - 6 epichlon 9155 4070 n ≅ 28 155__________________________________________________________________________cp - 7 : phenoxy resin ( phenoxy pkhh , available from union carbide co ., ltd .) ## str23 ## cp - 8 : epichlon 9055 whose terminal epoxy groups were modified withdiethanolamine ## str24 ## __________________________________________________________________________ * the epoxy equivalents in the epoxy resin was quantitatively determined by titration with perchloric acid to obtain the weight ( g ) of the resin per equivalent of the epoxy group . the inherent viscosity was 0 . 70 as determined in the same manner as with the polyarylate . 1 ) tensile test : the measurement was made according to astm d - 638 at a pulling speed of 50 mm / minute to determine a tensile break strength , a tensile modulus and a tensile break energy ( energy required before breakage ). 2 ) izod impact test : the measurement was made according to astm d - 256 using a thickness of 1 / 8 inches as notched . 3 ) heat distortion temperature : after annealing at 150 ° c . for 3 hours , the measurement was made according to astm d - 648 at a thickness of 1 / 8 inches at a load of 18 . 6 kg / cm 2 . 4 ) temperature at which the melt viscosity reaches 10 , 000 poises : the koka - type flow tester cft - 500 , made by shimadzu corporation , was used to successively measure the viscosity of resin by the use of a 0 . 5 mm × 1 . 0 mm nozzle under conditions of a load of 10 kg and a heating rate of 6 ° c ./ minute thereby determining a temperature at which the melt viscosity reaches 10 , 000 poises . this is a kind of criterion for moldability of the resin and a criterion for the degree as to how the gelation reaction proceeds . more particularly , when the temperature is lower , a less degree of gelation proceeds with more ease in molding . par - 1 used as the polyarylate - based resin , pa - 1 as the polyamide - based resin , and cp - 5 as the third ingredient were mixed in different mixing ratios indicated in table 1 and dried at 110 ° c . for 5 hours , followed by melt kneading and pelletizing in a twin - screw extruder at a cylinder temperature of 270 ° c . the resultant pellets of the respective mixtures were molded by means of an injection molding machine into 1 / 2 × 5 × 1 / 8 inch elongated test pieces and dumbbell specimens for astm tensile test . the respective moldings were evaluated with respect to the physical properties . the results are shown in table 1 . cl examples 7 to 11 and comparative examples 3 and 4 par - 1 used as the polyarylate - based resin , pa - 1 as the polyamide - based resin and cp - 6 as the third ingredient were mixed at different mixing ratios indicated in table 2 . after drying at 110 ° c . for 5 hours , the mixtures were each melt kneaded and pelletized by means of a twin - screw extruder at an appropriate cylinder temperature ranging from 240 ° to 360 ° c . the resultant pellets were molded and evaluated in the same manner as in example 1 . the results are shown in table 2 . par - 1 used as the polyarylate - based resin , pa - 1 used as the polyamide - based resin and each of the third ingredients indicated in table 3 were mixed at mixing ratios by weight of par - 1 / pa - 1 / third ingredient of 50 / 50 / 5 , followed by kneading , molding and evaluation in the same manner as in example 1 . the results are shown in table 3 . each of the polyarylate - based resins and each of the polyamide - based resins , both indicated in table 5 , and cp - 5 used as the third ingredient were mixed at mixing ratios by weight of polyarylate - based resin / polyamide - based resin / cp - 5 of 50 / 50 / 5 , followed by mixing , molding and evaluation in the same manner as in example 1 . the results are shown in table 4 . 6 kg of polycarbonate resin ( novarex 7025a , available from mitsubishi kasei corp . ), 4 kg of polyamide resin pa - 1 and , as the third component , 500 g of cp - 5 were mixed and the mixture was dried at 110 ° c . for 5 hours . the dried mixture was then melt - kneaded using a twin screw extruder at a cylinder temperature of 270 ° c . during the melt kneading , a part of the resins started to decompose inside the extruder and the decomposed substances gave out smoke , which resulted in the production of colored pellets . molding of the pellets was attempted using an injection molding machine , but they were not moldable because they decomposed inside the cylinder of the injection molding machine . 60 parts by weight of a polyarylate resin ( par - 1 ) and 40 parts by weight of a polyethylene terephthalate resin ( pe - 1 ) were mixed and dried at 110 ° c . for 5 hours . thereafter , the mixture was melt kneaded and pelletized by means of a twin - screw extruder at a cylinder temperature of 300 ° c . 50 parts by weight of the mixture of the polyarylate resin and polyethylene terephthalate resin and 50 parts by weight of nylon 6 ( pa - 1 ) were mixed , to which an epoxy resin ( cp - 5 ) was added in different amount per 100 parts by weight of this mixture . after drying the respective mixtures , each mixture was melt kneaded and pelletized by means of a twin - screw extruder at a cylinder temperature of 270 ° c . the resultant pellets were molded by means of an injection molding machine into 1 / 2 × 1 / 5 × 1 / 8 inch elongated test pieces and dumbbell specimens for astm tensile test . the physical properties of the respective moldings were evaluated . the results are shown in table 5 . from table 5 , it will be seen that the addition of small amounts of the epoxy resin results in a remarkable increase in the izod impact strength and the tensile break energy . however , when the content of the epoxy resin exceeds 15 parts by weight , not only the impact strength and the heat distortion temperature are lowered , but also the moldability is worsened . a polyarylate resin ( par - 1 ), a polyethylene terephthalate resin ( pe - 1 ), nylon 6 ( pa - 1 ) and an epoxy resin ( cp - 5 ) were mixed in different mixing ratios indicated in table 6 , followed by pelletization in the same kneading order and manner as in example 24 , injection molding and evaluation of the physical properties . the results are shown in table 6 . starting materials at different mixing ratios as indicated in table 7 were pelletized in the same manner as in example 24 wherein the polyarylate resin and polyethylene terephthalate were initially melt kneaded , to which the other two ingredients were added and melt kneaded for pelletization , followed by injection molding and evaluation of the physical properties . the results are shown in table 7 . table 1__________________________________________________________________________ melt temp . composition tensile test of 10 , 000 izod impact heat distortion par - 1 / pa - 1 / cp - 5 strength modulus break energy poises strength temperature ( ratios by weight ) ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________comparative 50 / 50 / 0 420 21100 220 272 1 . 5 165example 1example 1 50 / 50 / 1 607 21600 680 301 4 . 7 165example 2 50 / 50 / 3 649 21600 1700 312 11 . 5 162example 3 50 / 50 / 5 659 22800 1740 323 12 . 5 160example 4 50 / 50 / 7 666 22300 1200 335 13 . 0 155example 5 50 / 50 / 10 687 22300 570 342 8 . 1 153example 6 50 / 50 / 15 701 23100 170 380 7 . 2 128comparative 50 / 50 / 20 680 23000 120 & gt ; 400 6 . 6 119example 2__________________________________________________________________________ table 2__________________________________________________________________________ melt temp . composition tensile test of 10 , 000 izod impact heat distortion par - 1 / pa - 1 / cp - 5 strength modulus break energy poises strength temperature ( ratios by weight ) ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________comparative 0 / 100 / 5 629 23800 650 237 4 . 3 71example 3example 7 20 / 80 / 5 619 23400 800 290 6 . 5 132example 8 40 / 60 / 5 661 22900 1400 308 11 . 8 154example 9 50 / 50 / 5 666 22100 1600 319 12 . 0 157example 10 60 / 40 / 5 643 21500 1200 325 12 . 5 159example 11 80 / 20 / 5 649 21800 700 340 8 . 0 167comparative 100 / 0 / 5 741 22100 250 352 15 . 8 170example 4__________________________________________________________________________ table 3__________________________________________________________________________ melt temp . tensile test of 10 , 000 izod impact heat distortion third strength modulus break energy poises strength temperature ingredient ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________example 12 cp - 2 720 24000 420 335 5 . 0 140example 13 cp - 3 717 23900 550 314 6 . 3 142example 14 cp - 4 677 22900 800 323 11 . 3 151comparative cp - 1 impossible to mold dumbbell & gt ; 400 3 . 1 138example 5comparative cp - 7 604 22300 65 299 2 . 1 120example 6comparative cp - 8 614 22500 70 300 3 . 7 129example 7__________________________________________________________________________ table 4__________________________________________________________________________ melt temp . starting material tensile test of 10 , 000 izod impact heat distortion third strength modulus break energy poises strength temperaturepolyarylate polyamide component ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________example 15 par - 2 pa - 1 cp - 5 609 22900 550 320 6 . 7 130example 16 par - 3 pa - 1 cp - 5 596 21800 880 319 4 . 6 154example 17 par - 4 pa - 1 cp - 5 622 23200 1600 316 8 . 1 147example 18 par - 5 pa - 1 cp - 5 610 22000 2500 320 6 . 8 155example 19 par - 6 pa - 1 cp - 5 601 22900 600 321 8 . 4 160example 20 par - 7 pa - 1 cp - 5 650 22500 1850 320 13 . 0 159example 21 par - 8 pa - 1 cp - 5 645 22300 1900 315 12 . 6 158example 22 par - 1 pa - 2 cp - 5 699 23700 1100 313 8 . 0 161example 23 par - 1 pa - 3 cp - 5 524 16600 800 380 6 . 8 147__________________________________________________________________________ table 5__________________________________________________________________________ melt temp . composition tensile test of 10 , 000 izod impact heat distortion par - 1 / pe - 1 / pa - 5 / cp - 5 strength modulus break energy poises strength temperature ( ratios by weight ) ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________comparative 30 / 20 / 50 / 0 497 23900 30 266 2 . 6 115example 9example 24 30 / 20 / 50 / 1 549 24400 800 272 3 . 3 116example 25 30 / 20 / 50 / 3 724 25100 1500 283 4 . 5 122example 26 30 / 20 / 50 / 5 745 25200 2640 296 6 . 6 118example 27 30 / 20 / 50 / 7 749 25300 1800 310 6 . 5 115example 28 30 / 20 / 50 / 10 752 25400 1550 332 6 . 3 105example 29 30 / 20 / 50 / 15 747 25700 1410 380 5 . 2 102comparative 30 / 20 / 50 / 20 752 25700 1310 & gt ; 400 3 . 3 95example 10__________________________________________________________________________ table 6__________________________________________________________________________ melt temp . composition tensile test of 10 , 000 izod impact heat distortion par - 1 / pe - 1 / pa - 5 / cp - 5 strength modulus break energy poises strength temperature ( ratios by weight ) ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) (° c . ) __________________________________________________________________________comparative 0 / 50 / 50 / 5 646 25500 400 290 2 . 5 86example 11comparative 5 / 45 / 50 / 5 612 24900 60 301 2 . 8 87example 12comparative 9 / 41 / 50 / 5 585 24500 60 303 3 . 8 87example 13example 30 15 / 35 / 50 / 5 650 24400 930 308 7 . 1 92example 31 25 / 25 / 50 / 5 710 24400 2610 312 7 . 4 102example 32 35 / 15 / 50 / 5 740 25200 2380 316 5 . 4 128example 33 40 / 10 / 50 / 5 730 24500 2040 319 6 . 4 134example 34 45 / 5 / 50 / 5 690 23300 2110 320 9 . 5 145comparative 50 / 0 / 50 / 5 660 22800 1740 323 12 . 5 155example 14comparative 60 / 30 / 10 / 5 716 23300 1040 363 12 . 1 138example 15comparative 15 / 70 / 15 / 5 592 21900 90 295 2 . 8 94example 16__________________________________________________________________________ par - 1 : polyarylate resin pe - 1 : polyethylene terephthalate resin pa - 1 : polyamide resin table 7__________________________________________________________________________ melt temp . heat tensile test of 10 , 000 izod impact distortion composition strength modulus break energy poises strength tempera - ( ratios by weight ) ( kg / cm . sup . 2 ) ( kg / cm . sup . 2 ) ( kg · cm ) (° c .) ( kg · cm / cm ) ture__________________________________________________________________________ (° c . ) comparative par - 1 / pe - 1 / pa - 1 / cp - 1 = 30 / 20 / 50 / 5 impossible to mold dumbbell & gt ; 400 3 . 8 112example 17example 35 par - 1 / pe - 1 / pa - 1 / cp - 2 = 30 / 20 / 50 / 5 748 25700 1860 343 6 . 5 114example 36 par - 1 / pe - 1 / pa - 1 / cp - 3 = 30 / 20 / 50 / 5 742 25200 1930 337 6 . 8 115example 37 par - 1 / pe - 1 / pa - 1 / cp - 4 = 30 / 20 / 50 / 5 736 24900 2030 320 7 . 1 115example 38 par - 1 / pe - 1 / pa - 1 / cp - 6 = 30 / 20 / 50 / 5 728 25300 120 302 4 . 6 118comparative par - 1 / pe - 1 / pa - 1 / cp - 7 = 30 / 20 / 50 / 5 621 24300 70 270 3 . 5 108example 18comparative par - 1 / pe - 1 / pa - 1 / cp - 8 = 30 / 20 / 50 / 5 586 24800 80 272 3 . 3 106example 19example 39 par - 1 / pe - 1 / pa - 2 / cp - 5 = 30 / 20 / 50 / 5 775 26300 810 318 6 . 0 125comparative par - 1 / pe - 1 / pa - 2 = 45 / 5 / 50 580 22700 70 269 1 . 7 134example 20example 40 par - 1 / pe - 1 / pa - 2 / cp - 6 = 45 / 5 / 50 / 5 660 23700 730 309 7 . 5 113comparative par - 1 / pe - 1 / pa - 1 = 45 / 5 / 50 420 19500 30 268 2 . 7 137example 21example 41 par - 1 / pe - 1 / pa - 1 / cp - 6 = 45 / 5 / 50 / 5 570 19400 660 305 8 . 5 111__________________________________________________________________________ par - 1 : polyarylate resin pe - 1 : polyethylene terephthalate resin pa - 1 :, pa2 : polyamide resins cp - 1 to cp6 : epoxy resins cp - 7 : phenoxy resin cp - 8 : modified epoxy resin the resin composition according to the present invention has especially good moldability , heat resistance , impact strength , solvent resistance and high rigidity and are thus well balanced in the physical properties . when making use of these characteristic features , the resin composition of this aspect has utility optimumly as plastics for outer plates of automobile having the capability of paint baking , switches , knobs , housings of electronic and electric instruments which are exposed to intense heat , containers and housing instruments which are exposed to chemical compounds .