Process of thermal stabilization of halogeno-vinyl polymers and the resines so stabilized

Abstract From the Canadian patent

Disclosed is a process for the thermal stabilization of a halogeno-vinyl resin, which comprises incorporating into the resin (a) at least one polyol mercapto-alkanoic acid ester of the mixed type, said mixed ester having one part only of the hydroxyl groups of its polyol constituent esterified by the mercapto alkonoic acid and all the other hydroxyl groups of its polyol constituent, or a part of said other groups esterified by a sulfur-free organic acid; (b) at least one stabilizing metal compound whose metal is selected from groups IIB, IIIA, IVA and VA of the Periodic Classification of the Elements, and (c) at least one alkaline earth metal organic compound.