Stabilization of vinyl chloride polymers by means of lactone compounds

Claim 1

A stabilizer composition for polyvinyl chloride resin compositions comprising (a) 0.1 to 5 weight percent based upon the weight of the resin of at least one divalent metal salt of an organic carboxylic acid and (b) 0.05 to 5 weight percent based upon the weight of the resin of at least one α-acyl-lactone selected from the group consisting of those having the formula: ##STR8## said lactone ring being from 5- to 9-membered; wherein R is selected from the group consisting of an aliphatic hydrocarbon radical having from 2 to 30 carbon atoms and phenyl; and R' is a polymethylene bridge of the formula: ##STR9## Wherein n is an integer from 2 to 6, R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, aryl, arylalkyl and cycloaliphatic, and wherein any R 1 or R 2 depending from any given methylenic carbon in the bridge may, together with any R 1 or R 2 depending from an adjacent methylenic carbon in the bridge, be joined to form a carbocyclic ring fused to the lactone ring, and further wherein the total number of carbon atoms in said polymethylenic bridge ranges from between 2 to 30; and those having the formula: ##STR10## wherein each R and R' is as defined above, and A is a member selected from the group consisting of a divalent aliphatic radical, a divalent aromatic radical, an oxygen atom interrupted divalent aliphatic radical, a carboxyl interrupted divalent aliphatic radical, and an oxygen atom interrupted divalent aromatic radical, and further wherein the total number of carbon atoms in the radicals R' and A does not exceed 30 and each of the lactone rings comprising the lactone of the formula being from 5- to 9-membered.