Halogen-containing resin stabilizer comprising an alkoxycarbonylalkylenetin sulfide

Claim 1

A stabilizer composition for enhancing the resistance to deterioration upon heating of a halogen-containing resin comprising (A) at least one sulfide compound of four-valent tin having linked to a tin atom at least one sulfide group and through carbon from one to two alkoxycarbonylalkylene groups having from 1 to 8 carbon atoms in the alkoxy group and from 2 to 3 carbon atoms in the alkylene group and represented by the formula [S.sub.a (C.sub.b H.sub.2b CO.sub.2).sub.c Sn.sub.d (C.sub.e H.sub.2e CO.sub.2 R).sub.2 ].sub.n and (B) at least one tin mercaptoalkylenecarboxylic acid ester having linked to a tin atom through sulfur from 2 to 3 mercaptoalkylenecarboxylic acid alkyl ester groups and 4 to 18 carbon atoms in the alkyl ester group, and through carbon from 1 to 2 alkoxycarbonylalkylene groups having from 1 to 8 carbon atoms in the alkoxy group and from 2 to 3 carbon atoms in the alkylene group and represented by the formula ROOCC.sub.e H.sub.2e Sn(SC.sub.b H.sub.2b CO.sub.2 R').sub.2 R" in which formulae R is an alkyl group having from 1 to 8 carbon atoms, R' is an alkyl group having from 4 to 18 carbon atoms, R" is --C e H 2e CO 2 R or --SC b H 2b CO 2 R', a is an integer from 1 to 4, b is 1 or 2, c is 0 or 1, d is 1 or 2, e is 2 or 3, n is from 1 to about 100, provided that when d is 2 a is at least 3, the stabilizer composition containing at least 5% by weight of the sulfide compound (A).