Patent ID: 6919392

Claim:
A method of stabilizing a vinyl halide resin comprising the steps of: adding to the vinyl halide resin (a) a metal containing stabilizer corresponding to formula I RSn(S)(SR″) (I) in which, R represents an alkyl group, and SR″ represents a mercaptide ligand; and (b) a mercapto alkanol ester of a carboxylic acid which is added to said resin in an amount from about 2 to 25 times the amount of the Sn in said metal containing stabilizer, wherein said mercapto alkanol ester of a carboxylic acid has the formula: R a COOR b SH where R a is a linear or branched alkyl or alkenyl, aryl or aralkyl; and R b represents a C 2 to C 18 alkylene, and replaces from about 20% to about 90% by weight of the metal containing stabilizer and wherein said composition has a heat or light stability at least comparable to a composition where said mercapto alkanol ester does not replace about 20% to about 90% by weight of the metal containing stabilizer.