Abstract: The present invention relates to an aromatic polycarbonate composition which is stabilized by adding to an aromatic polycarbonate (containing substantially no chlorine atom) a very slight amount of at least one compound selected from a phosphorous acid diester and a phosphorous acid monoester and at least one compound selected from a phenolic antioxidant, a phosphorous acid triester and an organic phosphonite. This composition has the characteristics that molded products made therefrom are superior in hot-water resistance and steam resistance and recycling molding thereof causes substantially no coloration. Thus, this composition is high in industrial applicability.

Abstract: A composition comprising an ethylene/chlorotrifluoroethylene copolymer and an effective stabilizing amount of a phenolic complex of the formula: ##STR1## wherein at least one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 is --OH, and wherein the remaining R.sub.1 through R.sub.5 is hydrogen or an aliphatic hydrocarbon, and wherein each of R.sub.1 through R.sub.5 may be the same or different provided that at least one of R.sub.1 through R.sub.5 is --OH, and each of R.sub.6 and R.sub.7 is an alkylene group having from 1 to about 10 carbon atoms, and each of R.sub.6 and R.sub.7 may be the same or different. The composition may further include a phosphite, a thioester or sulfide compound, and/or an inorganic filler such as tricalcium aluminate hexahydrate. Such compositions show improved melt stability at high temperatures and are useful as wire and cable coatings, films, and pipes.

Abstract: Polyvinyl chloride compositions as well as flexible sheets and swimming pool liners of such compositions which contain significant quantities of an ultra high molecular weight polyvinyl chloride resin together with a heat stabilizer, plasticizer and optional additives are disclosed. In preferred compositions: the PVC resin is a mixture of high molecular weight and ultra high molecular weight PVC: the heat stabilizer is a mixed zinc-barium-alkyl phosphite stabilizer; and the composition contains 2-hydroxy-4-(2-hydroxyethoxy) benzophenone as an ultraviolet light absorber.

Abstract: The present invention provides a thermoplastic composition excellent in heat resistance and water resistance which includes a thermoplastic saturated norbornene polymer which has a number-average molecular weight (Mn) of 50,000-500,000 and a weight-average molecular weight (Mw) of 100,000-2,000,000 which are measured by high performance liquid chromatography, and a molecular weight distribution (Mw/Mn) of 2.2 or more, and a volatile content of at most 0.3% by weight higher. The composition is suitable for optical materials, electroconductive composite materials and optical recording media.

Abstract: The present invention relates to glass filled poly(arylene sulfide) molding compositions which upon being molded result in products having improved mechanical properties. Methods of preparing the compositions, methods of using the compositions to form molded products and the molded products so produced are also provided. The compositions are comprised of poly(arylene sulfide) resin, glass reinforcement material, an epoxysilane and an organic phosphite.

Abstract: Improved resin compositions for use in multiple cavity stretch blow molding processes comprising: (a) a propyleneethylene copolymer resin including from about 5% to about 15% of a second stage polymer characterized by a cycle time of T.sub.1, when used to produce containers in multiple cavity stretch blow molding processes; (b) from about 0.1% to about 1.0% of a nucleating agent prepared by irradiating in air a mixture of a propylene homo or copolymer and about 500 to about 3000 ppm of antioxidant with a sufficient amount of ionizing radiation to cause said nucleating agent to have a xylene insoluble content of at least 30%. The improved resin composition is characterized by a cycle time of T.sub.2 when used to produce containers in multiple cavity stretch blow molding processes such that the ratio of T.sub.2 /T.sub.1 is less than 0.95.

Abstract: The present invention relates to a styrene-based resin composition comprising a styrene-based polymer having mainly a syndiotactic configuration and a specified antioxidant, a fibrous molding or extrusion produced by spinning a syndiotactic styrene resin composition and a molding produced by shaping and/or spinning, and stretching said resin.

Abstract: Disclosed are olefin polymers in nonextruded, aspolymerized particle form having a regular, essentially symmetrical geometrical shape, which are stabilized by depositing on their surface a mixture which is either melted, or in which at least stabilizer (A) is in the liquid state, and which comprises the following stabilizers (percent by weight on the polymer):A) from 0.02% to 0.015% of one or more organic phosphites or phosphonites or mixtures thereof, which are liquid at room temperature or have melting point below 100.degree. C.;B) from 0.025% to 0.2% of one or more phenolic antioxidants with melting point from 45.degree. to 130.degree. C.; and, optionally, one or more of the following additional components:C) from 0.05% to 0.5% of one or more thioethers, or organic polysulfides or mixtures thereof;D) from 0.1% to 1.0% of one or more light stabilizers which are liquid at room temperature or have a melting point below 150.degree. C.

Abstract: A flame retardant having excellent resistance to water and acid for a long period of time and comprising 100 parts by weight of magnesium hydroxide of which the surface is treated with a phosphoric ester of formula (I) ##STR1## wherein R represents an alkyl or alkenyl group having 10 to 30 carbon atoms, M represents an atom belonging to group IA of the periodic table or NH.sup.4+, and n represents 1 or 2, and 0.1 to 10 parts by weight of a salt of a metal other than alkali metals with a higher fatty acid, and a resin composition containing the flame retardant.

Abstract: Hydrolytically stable phosphite compositions for melt flow and color stabilization of thermoplastics may be prepared from crude tetrahydroabietyl alcohol. The phosphites may be reacting said alcohol with an organophosphite, such as by transesterification. Other synthesis techniques may also be used.

Abstract: A stabilized halogen-containing resin composition wherein(a) 0.01 to 10 weight parts of da hydrotalcite,(b) 0.01 to 5 weight parts of a zinc compound,(c) 0.01 to 5 weight parts of magnesium hydroxide, and(d) 0.01 to 5 weight parts of a .beta.-diketone compound and/or a phosphite compoundare compound into a halogen-containing resin per 100 weight parts thereof and a molding article therefrom.

Abstract: A polycarbonate resin composition improved in heat resistance by the addition of an organic cyclic phosphite represented by the general formula: ##STR1## wherein R.sub.1 represents an alkyl group having 1 to 9 carbon atoms; R.sub.2 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R.sub.3 represents an alkyl group having 1 to 30 carbon atoms.

Abstract: The thermo-oxidation resistance of the elastomeric thermoplastic copolyether-esters is remarkably improved by the addition of a synergistic mixture consisting of an organo phosphite and a pentaerythritol phosphite.The copolymer-esters thus compounded find use in the extrusion, blow and injection molding technologies.

Abstract: A composition useful for the thermal stabilization of polyvinylchloride resin comprising an alkyl and aryl-substituted beta-diketone, mannitol and a mixture of magnesium and zinc salts of benzoic and fatty aliphatic acids is disclosed. Also disclosed is polyvinylchloride resin effectively stabilized with the stabilizer composition and a method for effectively stabilizing polyvinylchloride from discoloration at elevated temperatures.

Abstract: Heat-stabilized, non-yellowing chlorinated polymers having extended working ranges, notably PVC polymers and copolymers, contain effective stabilizing amounts of (a) at least one organozinc compound, (b) at least one organic calcium, barium, magnesium or strontium compound, and (c) at least one sodium .beta.-diketonate.

Abstract: N-hydroxy substituted hindered amine light stabilizers impart outstanding stabilization properties to acid catalyzed thermoset coating compositions with enhanced resistance against the deleterious effects of light, moisture or oxygen in the substantial absence of cure inhibition.

Abstract: An improved thermoplastic resin composition is described, containing polyphenylene ether resin, polyamide resin, and certain organophosphorus compounds. Particular examples of the organophosphorus compounds are dimethyloxazolinylmethylbisvinylphenyl phosphate and bis(dimethyloxazolinylmethyl)vinylphenyl phosphate. The compositions are characterized by excellent mechanical properties and oil resistance.

Abstract: A thermoplastic polyester resin composition exhibiting improved antistatic properties including a thermoplastic polyester resin, between about 0.02 to about 10 wt. %, based on the total weight of the composition, of a sulfonate-type anionic antistatic agent, and between about 0.005 to about 10 wt. %, based on the total weight of the composition, of one or more compounds selected from organophosphorus compounds, and organic chelating agents.

Abstract: Di-(2,2,6,6-tetramethyl-4-piperidinyl) succinate and glutarate are very effective light stabilizers for thermoplastics, particularly for polyolefins.

Abstract: The present invention relates to glass filled poly(arylene sulfide) molding compositions which upon being molded result in products having improved mechanical properties. Methods of preparing the compositions, methods of using the compositions to form molded products and the molded products so produced are also provided. The compositions are comprised of poly(arylene sulfide) resin, glass reinforcement material, an epoxysilane and an organic phosphite.

Abstract: A solid stabilizer composition for synthetic polymers is formed by a solid, continuous phase and by a solid dispersed phase in said continuous phase, wherein the continuous phase is constituted by amorphous 2,2'-oxamido-bis[ethyl-3-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionate] and the dispersed phase is constituted by an amorphous, or crystalline, or partially amorphous and partially crystalline organic phosphite, with the weight ratio of said continuous phase to said dispersed phase being comprised within the range of from 9:1 to 1:9.The process for preparing said solid composition and its use in the stabilization of synthetic polymers are disclosed.

Abstract: Linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon demonstrate melt stability when selected proportions of zinc oxide, zinc sulfide and a trialkylphosphite are incorporated therein.

Abstract: A solid stabilizer composition for organic polymers is formed by a solid, continuous phase and by a dispersed phase in said continuous phase, wherein the continuous phase is constituted by amorphous tetrakis-[3-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionyloxymethyl]-metha ne and the dispersed phase is constituted by an either amorphous or crystalline organic phosphite, in the form of particles with a particle size of from 10 .mu.m to 2 mm, with the weight ratio of said continuous phase to said dispersed phase being comprised within the range of from 9:1 to 1:9.The processes for preparing said solid stabilizer composition and its use in the stabilization of organic polymers are disclosed.

Abstract: A conjugated diene/monovinyl substituted aromatic hydrocarbon copolymer is stabilized by the addition of a complex acrylate, in combination with at least one of an alkyl thiopropionate, an organic phosphite and a non-acrylate substituted hindered phenolic compound.

Abstract: A process for forming random copolymers which comprises forming a polymer melt containing one or more polyamides and one or more aryl phosphoryl azide compounds, such as diphenyl phosphoryl azide; and heating said melt for a period of time sufficient to form the desired amount of the copolymer.

Abstract: The present invention relates to a process for the viscosification of an aqueous liquid which includes the steps of forming a solvent system of an organic liquid or oil and a polar cosolvent, the polar cosolvent being less than about 15 weight percent of the solvent system, a viscosity of the solvent system being less than about 1,000 cps; forming an interpolymer complex of neutralized sulfonated polymer (water insoluble) and copolymer of styrene/vinylpyridine in the solvent system to form a solution, a concentration of the water insoluble interpolymer complex polymer in the solution being about 0.01 to about 0.5 weight percent, a viscosity of the solution being less than about 200 cps; the admixing or contacting said solution with about 5 to about 500 volume percent water, the water being immiscible with the organic liquid and the polar cosolvent and interpolymer complex transferring from the organic liquid to the water phase, thereby causing the water phase to gel (i.e., thicken).

Abstract: A polyester, wherein pendent phosphorus atoms are bound to the main chain of the polyester, having an excellent flame resistance and a high intrinsic viscosity can be stably produced without deteriorating the properties of said polyester by preliminarily copolymerizing a polyester with a specific unsaturated compound and then reacting the unsaturated bond thus-formed with a specific phosphorus compound having a P-H bond.

Abstract: High impact resistant polycarbonate, a process for producing said polycarbonate, and a polycarbonate resin composition are disclosed. This polycarbonate consists of a main chain with a cumylphenoxy group, as a terminal group, bonded to at least one end thereof, said main chain comprising a repeating unit represented by the formula (I): ##STR1## and has a viscosity average molecular weight of at least 10,000 and an acetone soluble content of not more than 3.5 wt %. The polycarbonate can be efficiently produced by the process of the invention. The composition comprises a polycarbonate resin and a specific amount of a phosphorus-based antioxidant.

Abstract: The melt crystallization temperature (T.sub.mc) of an arylene sulfide polymer is reduced by incorporating therein an effective amount of an organic phosphite.

Abstract: The invention relates to a polymer mixture which comprises a polyphenylene ether, a block copolymer, and a phosphate ester in a given ratio by weight. The polymer mixture according to the invention is particularly suitable as a material for cable sheaths.

Abstract: Disclosed is an antistatic thermoplastic resin composition which comprises a thermoplastic resin and a minor amount of an antistatic property-imparting material which is a polymer comprising 20 to 100 weight % of units of a monomer having a quaternary ammonium base represented by the formula (I): ##STR1## wherein R.sub.1 represents hydrogen or methyl, R.sub.2 through R.sub.4 represent hydrogen or (C1-9) alkyl, which may have a substituent, n is a number of 1 to 10, and X.sup.- represents a monovalent acid group or a corresponding equivalent of an acid, and up to 80 weight % of units of a copolymerizable vinyl or vinylidene monomer.

Abstract: A metal rubber gasket includes a central metal lamina sandwiched by two outer elastomer layers. The elastomer is a blend of a butadiene-acrylonitrile rubber and a random terpolymer of ethylene, alkyl acrylate and the mono alkyl ester of a dioic acid. Preferably the butadiene-acrylonitrile rubber is functionally modified with polar groups such as a carboxyl, amine, or hydroxyl groups.

Abstract: An ignition resistant carbonate polymer composition comprising a mixture of one or more carbonate polymers, and a high elastic memory polytetrafluoroethylene having a heat shrinkage equal to or greater than 15% with or without one or more organo phosphorous compounds.

Abstract: Stabilizers for organic polymers, consisting of one or more phosphorus-containing compounds of the family of alkyl- and/or phenyl-phosphites, alkyl- and/or phenyl-phosphonites, alkyl- and/or phenyl-diphosphonites, are directly added to the reaction mixture during the (co)polymerization of .alpha.-olefins or of mixtures thereof with other unsaturated monomers.The so-obtained polymeric compositions result perfectly stabilized, and show a thermo-oxidative resistance higher than that of the same polymeric compositions to which the same antioxidants have been added by a traditional route.

Abstract: Stabilizer mixtures for stabilizing plastics comprising one part by weight of a chroman derivative (I) of the general formula ##STR1## where R= ##STR2## where Z=C.sub.7 -C.sub.30 -alkyl, --CH.sub.2 CH.sub.2 --S--[C.sub.1 -C.sub.30 -alkyl] or ##STR3## and from 5 to 14 parts by weight of an organic phosphite of the general formula (II) ##STR4## where R.sup.1, R.sup.2 and R.sup.3 are identical of different alkyl and/or aryl or of an organic phosphonite of the formula (III) ##STR5## where +is C(CH.sub.3).sub.3, a mixing ratio (a):(b) of from 1:6 to 1:10 being preferred.

Abstract: Segmented thermoplastic copolyester elastomers containing recurring polymeric long chain ester units derived from phthalic acids and long chain glycols and short chain ester units derived from phthalic acids and 1,4-butanediol or 1,4-butenediol. The elastomers also contain polyvinylpyrrolidone and preferably also contain guanidine stabilizer, phosphorus stabilizer and diphenylamine.

Abstract: A can carrier composition comprising at least one of each of the following components wherein all parts are by weight based on 100 parts by weight of component (i):(i) a high pressure polyethylene having a density in the range of about 0.918 to about 0.930 gram per cubic centimeter;(ii) a linear polyethylene having a density of less than about 0.925 gram per cubic centimeter in an amount of about 2 to about 35 parts;(iii) polyethylene wax in an amount of about 0.5 to about 5 parts;(iv) a mineral filler coated with a metal salt of a fatty acid in an amount of about 0.05 to about 0.50 parts;(v) a secondary amide in an amount of about 0.02 to about 0.15 part;(vi) an antioxidant in an amount of about 0.02 to about 0.10 part; and(vii) an organic phosphorus compound in an amount of about 0.005 to about 0.05 part.

Abstract: Stabilized chlorine-containing polymers containing at least one anilinotriazine of the formula I ##STR1## in which R.sub.1 is phenyl or a group of the formula II ##STR2## in which R.sub.4, R.sub.5 and R.sub.6 independently of one another are chlorine, bromine, cyano, methoxycarbonyl, ethoxycarbonyl, carbamoyl, hydroxyl, methoxy, ethoxy or C.sub.1 -C.sub.18 -alkyl and n.sub.1, n.sub.2 and n.sub.3 are 0, 1, 2, or 3, subject to the proviso that the sum of n.sub.1 +n.sub.2 +n.sub.3 is an integer from 1 to 3, and R.sub.2 and R.sub.3 independently of one another are C.sub.2 -C.sub.4 -hydroxyalkyl, and also novel anilinotriazines and the use thereof for stabilizing chlorine-containing polymers against the harmful effects of light and/or heat.

Abstract: An improved melt-processable composition of a thermoplastic polymer selected from the class consisting of hexafluoroisobutylene/vinylidene fluoride copolymer, and ethylene/chlorotrifluoroethylene copolymer, wherein added to said thermoplastic polymer are a phosphite ester and an oxamidoester. A preferred phosphite ester is tris (2,4-di-tert-butylphenyl) phosphite, and a preferred oxamidoester is 2,2'-oxamidobis [ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]. In a preferred composition, about 1 wt. % of phosphite ester and about 0.5 wt. % of oxamidoester are added to a hexafluoroisobutylene/vinylidene fluoride copolymer.

Abstract: This invention provides a flame-retardant resin composition comprising (A) about 100 parts by weight of at least one resin selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, isobutylene-isoprene copolymer and ethylene-propylene-diene terpolymer, (B) about 50 to about 300 parts by weight of a hydrate of metallic oxide, and (C) about 0.05 to about 5 parts by weight of a phosphorus-containing titanate coupling agent, the composition having been already crosslinked by use of about 0.1 to about 20 parts by weight of a crosslinking agent or by irradiation of ionizable radiation.The composition of the invention has an outstanding flame retardancy and can be made into a molded product capable of exhibiting fully useful mechanical and electrical characteristics.

Abstract: A polycarbonate resin composition comprising a blended mixture of(A) 100 parts by weight of a polycarbonate resin having a viscosity average molecular weight of from about 13,000 to about 18,000,(B) 0.01 to 0.1 part by weight of a partial ester of a monobasic fatty acid having 10 to 22 carbon atoms with a polyhydric alcohol having 2 to 10 carbon atoms,(C) 0.001 to 0.01 part by weight of trimethyl phosphate, and(D) 0.00001 to 0.002 part by weight, calculated as phosphorus atoms, of a phosphite ester having 9 to 60 carbon atoms.

Abstract: The silicone rubber composition comprises, in addition to the conventional ingredients of a high-polymeric diorganopolysiloxane and a reinforcing silica filler, a specific phosphorus-containing organic compound, such as phosphinates, phosphonates and phosphates, in a limited amount. By virtue of this unique ingredient, the composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue.

Abstract: Compounds of formula I ##STR1## wherein R is --COOCH.sub.3, --COOC.sub.2 H.sub.5 or methyl, R.sub.1 is --COOR.sub.3, R.sub.2 is hydrogen, methyl or ethyl and R.sub.3 is C.sub.1 -C.sub.22 alkyl, are suitable for stabilizing organic polymers, in particular chlorinated thermoplastics, against the influence of heat and/or light.

Abstract: A flame retardant polyolefin resin composition which, when molded, affords a molded product having highly flame retardant properties, no dripping properties, a smooth surface and an excellent appearance and superior resistances to heavy metal deterioration, heat deterioration and weather is provided, which composition consists of (A) 5-60% by weight of a halogen-containing flame retardant, (B) 100-10% by weight of antimony trioxide based on the weight of the halogen-containing flame retardant, (C) 0.5-15% by weight of a crosslinking agent, (D) 0.05-5% by weight of a specified thiophosphite, and (E) the balance % by weight of a polyolefin resin, the total of the quantities of (A), (B), (C), (D) and (E) being 100% by weight. If necessary, a processing aid may be further added to the above flame retardant polyolefin resin composition.

Abstract: Tris-organophosphite compositions are provided having an improved hydrolytic stability, comprising(1) a tris-organophosphite of the formula: ##STR1## wherein: R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of alkyl, alkenyl, aryl, alkylaryl and aralkyl groups together aggregating at least fourteen carbon atoms up to about sixty carbon atoms; and(2) a long-chain aliphatic amine in an amount to improve the hydrolytic stability of the phosphite and having the formula: ##STR2## wherein: R.sub.4, R.sub.5 and R.sub.6 are selected from the group consisting of hydrogen; aliphatic (including alkyl and alkenyl) groups having from one to about thirty-six carbon atoms; and hydroxyalkyl having from two to about six carbon atoms; one of R.sub.4, R.sub.5 and R.sub.6 is an aliphatic group having at least ten carbon atoms, and the remaining of R.sub.4, R.sub.5 and R.sub.6 are selected from hydrogen, alkyl having from one to four carbon atoms and hydroxyalkyl; and preferably at least one of R.sub.4, R.sub.

Abstract: A fire-resistant thermoplastic composition comprising polyvinyl butyral resin and a compatible mixture in an amount sufficient to provide fire-resistant properties to such composition which includes (a) a plasticizer blend of a char-forming component, such as an organic phosphate, and an oxygen sequestering agent, such as an organic phosphite, wherein the char-forming component is the major constituent; (b) a nucleating agent such as fumed silica for dispersing the fire decomposition products of the composition; and (c) a heat reactive bonding resin.

Abstract: New hindered piperidinoalcohol 1,1,1-trioxyalkanes are disclosed. In the 1,1,1-trioxyalkanes, at least on 1,1,1-trioxyalkane group is linked to the residue of an alcohol linked to the 4-position of a 2,2,6,6-tetraalkylpiperidine compound having 12 to 75 carbon atoms. For each 1,1,1-trioxalkane group, there are 1 to 3 tetraalkylpiperidine groups. The alkyl groups linked to the piperidine ring have from one to five carbon atoms each. The fourth substituent on the carbon atom of the 1,1,1-trioxyalkane is a hydrogen atom or an aliphatic group having one to five carbon atoms.The disclosed 1,1,1-trioxyalkanes protect a variety of synthetic resins against the deteriorative effects of exposure to actinic light.Stabilizer compositions comprising a disclosed 1,1,1-trioxyalkane and a known polymer stabilizer, as well as synthetic resin compositions stabilized with such stabilizer compositions, are also disclosed.

Abstract: The invention relates to a thermoplastic moulding compound consisting of:A. at least 95% (wt) of a copolymer consisting of1. 50-95 moles % styrene and/or .alpha.-methylstyrene2. 50-55 moles % unsaturated dicarboxylic anhydrideB. at most 5% (wt) of an phosphite with the general formula of ##STR1## where R represents hydrogen or the residue of an alkyl, cycloalkyl, aryl, alkaryl or aralkyl, while the R substituents need not to be the same and may contain heteroatoms.It has been found that additions of these phosphites to SMA-containing moulding compounds checks the decomposition of SMA, prevents the moulding compound from getting stuck to the processing equipment and consequently reduces corrosion to a high degree.

Abstract: The invention relates to thermoplastic molding compositions based on vinyl chloride polymers and containing, as stabilizer, 0.1 to 5% by weight of an aminouracil of the formula I ##STR1## wherein R.sup.1 is hydrogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl, phenyl, benzyl, C.sub.1 -C.sub.4 hydroxyalkyl, hydroxyphenyl, C.sub.2 -C.sub.8 alkoxyalkyl, C.sub.2 -C.sub.8 alkylthioalkyl, C.sub.6 -C.sub.10 cycloalkoxyalkyl, C.sub.6 -C.sub.10 cycloalkylthioalkyl, C.sub.8 -C.sub.14 aralkoxyalkyl, C.sub.8 -C.sub.14 aralkylthioalkyl, C.sub.7 -C.sub.14 aryloxyalkyl, C.sub.7 -C.sub.14 arylthioalkyl, --NHR.sup.4, in which R.sup.4 is hydrogen, phenyl or chlorine-substituted phenyl, and R.sup.2 and R.sup.3, each independently of the other, are C.sub.2 -C.sub.21 alkyl, C.sub.6 -C.sub.12 aryl or C.sub.7 -C.sub.19 aralkyl, while one of R.sup.2 and R.sup.3 may also be hydrogen.The addition of such aminouracils gives vinyl chloride polymers which are very well protected against heat-induced degradation.

Abstract: A composition comprising a dioctyl tin mercaptide, a zinc salt of a fatty acid such as zinc stearate and a conventional phosphite ester stabilizer is effective in stabilizing PVC resins. The stabilized resins exhibit excellent initial color and stability under processing conditions.