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A carbon monoxide modified ethylene-vinyl acetate copolymer composition is disclosed, having diminished tendency to cause discoloration on heating at 177° C. of a plastic composition whose major polymeric component is polyvinyl chloride, comprising carbon monoxide modified ethylene-vinyl acetat

A carbon monoxide modified ethylene-vinyl acetate copolymer composition is disclosed, having diminished tendency to cause discoloration on heating at 177° C. of a plastic composition whose major polymeric component is polyvinyl chloride, comprising carbon monoxide modified ethylene-vinyl acetate copolymer and an amount, effective in diminishing discoloration, of at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates.

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1. A composition consisting of a carbon monoxide modified copolymer of ethylene an unsaturated ester softening monomer and from 0.03 part by weight to 10 parts by weight per 100 parts by weight of said carbon monoxide modified ethylene copolymer of at least one inorganic perchlorate salt selected fr

1. A composition consisting of a carbon monoxide modified copolymer of ethylene an unsaturated ester softening monomer and from 0.03 part by weight to 10 parts by weight per 100 parts by weight of said carbon monoxide modified ethylene copolymer of at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates. 2. The composition of claim 1, wherein said carbon monoxide modified ethylene copolymer is a carbon monoxide modified ethylene-vinyl acetate copolymer. 3. The composition of claim 1, wherein said inorganic perchlorate is sodium perchlorate. 4. The composition of claim 3, wherein said perchlorate is sodium perchlorate monohydrate. 5. A plastic composition consisting of polyvinyl chloride, a carbon monoxide modified copolymer of ethylene an unsaturated ester softening monomer, at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates, and, optionally,A) at least one plasticizer;B) at least one heat stabilizer selected from the group consisting of:1) barium, calcium, magnesium, strontium, and zinc salts of aliphatic or aromatic non-nitrogenous monocarboxylic acids having from 6 to 24 carbon atoms;2) ethers and esters having epoxide groups and molecular weights of at least 200 daltons; and3) 1,3-dicarbonyl compounds having molecular weights of at least 200 daltons;C) lubricants;D) flame retardants;E) colorants; andF) fillers. 6. The composition of claim 5, wherein said carbon monoxide modified ethylene copolymer is a carbon monoxide modified ethylene-vinyl acetate copolymer. 7. The composition of claim 6, wherein the amount of carbon monoxide modified ethylene-vinyl acetate copolymer is in the range from 5 parts by weight to 75 parts by weight per 100 parts by weight of polyvinyl chloride. 8. The composition of claim 6, wherein the amount of said perchlorate is in the range from 0.03 parts by weight to 10 parts by weight per 100 parts by weight of carbon monoxide modified ethylene-vinyl acetate copolymer. 9. The composition of claim 6, wherein said inorganic perchlorate is sodium perchlorate. 10. The composition of claim 6, wherein said at least one plasticizer is present and is selected from the group consisting of dialkyl phthalates and trialkyl trimellitates having independently in each alkyl group seven to eleven carbon atoms. 11. The composition of claim 6, wherein said at least one heat stabilizer is present and is selected from the group consisting of barium, calcium, magnesium, strontium and zinc salts of a monocarboxylic acid having 7-24 carbon atoms. 12. The composition of claim 6, wherein said at least one heat stabilizer is present and is an epoxide compound. 13. A masterbatch composition adapted for safe storage, transport, and compounding with a plastic composition whose major polymeric component is polyvinyl chloride, consisting of carbon monoxide modified ethylene-vinyl acetate copolymer and at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates, said masterbatch containing from 7 parts by weight to 50 parts by weight of said perchlorate salt per 100 parts by weight of carbon monoxide modified ethylene-vinyl acetate copolymer and, optionally,A) at least one plasticizer;B) at least one heat stabilizer selected from the group consisting of:1) barium, calcium, magnesium, strontium, and zinc salts of aliphatic or aromatic non-nitrogenous monocarboxylic acids having from 6 to 24 carbon atoms;2) ethers and esters having epoxide groups and molecular weights of at least 200 daltons; and3) 1,3-dicarbonyl compounds having molecular weights of at least 200 daltons;C) lubricants;D) flame retardantsE) colorants; andF) fillers. 14. The masterbatch composition of claim 13, containing from 10 parts by weight to 30 parts by weight of said perchlorate salt per 100 parts by weight of carbon monoxide modified ethylene-vinyl acetate copolymer. 15. The masterbatch composition of claim 13, wherein said perchlorate is sodium perchlorate. 16. The masterbatch composition of claim 15, wherein said perchlorate is sodium perchlorate monohydrate. 17. A method of reducing discoloration on heating at 180° C. of a plastic composition consisting of 100 parts by weight of polyvinyl chloride, from 5 parts by weight to 75 parts by weight of a carbon monoxide modified ethylene-vinyl acetate copolymer, and, optionally,A) at least one plasticizer;B) at least one heat stabilizer selected from the group consisting of:1) barium, calcium, magnesium, strontium and zinc salts of aliphatic or aromatic non-nitrogenous monocarboxylic acids having from 6 to 24 carbon atoms;2) ethers and esters having epoxide groups and molecular weights of at least 200 daltons; and3) 1,3-dicarbonyl compounds having molecular weights of at least 200 daltons;C) lubricants;D) flame retardants;E) colorants; andD) fillers;comprising the step of adding to said composition from 0.03 parts by weight to 10 parts by weight of at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates per 100 parts by weight of the carbon monoxide modified ethylene-vinyl acetate copolymer.