Patent ID: 7320764

Claim:
A vinyl resin stabilizer additive composition which consists of: at least two phosphite esters selected from the group consisting of alkyl bisphenol-A phosphites and pentaerythritol phosphites; and a zinc additive wherein a molar ratio of P/Zn is from about 80:1 to 4:1, and further wherein said additive composition is free of calcium, cadmium, barium and tin; and further wherein said alkyl bisphenol-A phosphite is of formula (IV) wherein R 1 is independently selected from the group consisting of H, C 1-18 alkyl, C 1-18 alkoxy, halogens and R 3 is C 10-15 alkyl, and m is an integral value from 0 to 5 inclusive, and wherein said pentaerythritol phosphite is of formula (VI) wherein R 4 is selected from the group consisting of C 8-18 alkyl, C 6-30 aryl, C 6-30 fused aryl rings, C 7-35 alklylaryl, C 7-35 arylalkyl and substituted derivatives thereof wherein the substituents are selected from the group consisting of halogens, hydroxyl, C 1-4 alkyl and C 1-4 alkoxy.