Patent ID: 8067490

Claim:
A thermoplastic resin composition comprising a thermoplastic resin and a phosphite stabilizer composition with enhanced hydrolytic resistance, said phosphite stabilizer composition comprising: a first phosphite of the structure wherein R 1 , R 3 , R 8 , and R 10 are selected from alkyl groups having from 1 to 8 carbon atoms; R 2 , R 4 , R 5 , R 6 , R 7 and R 9 are hydrogen; an optional first phosphonite of the structure wherein R 1 , R 3 , R 8 , and R 10 are selected from alkyl groups having from 1 to 8 carbon atoms; R 2 , R 4 , R 5 , R 6 , R 7 and R 9 are hydrogen; n is 2; a second phosphite of the structure wherein R 11 , R 13 , R 15 , R 16 and R 17 are selected from alkyl groups having from 1 to 8 carbon atoms, and R 12 and R 15 are hydrogen; and an acid scavenger, wherein the first phosphite is present from 82 to 87 weight percent, the second phosphite is present from 6 to 11 weight percent and the acid scavenger is present from about 1 to about 10 weight percent, each based on the total weight of first phosphite, second phosphite, acid scavenger and optional first phosphonite.