NON-TOXIC STABILISER MIXTURES FOR HALOGEN-CONTAINING POLYMERS

摘要

A stabiliser mixture for use in moulding materials comprising halogen-containing polymers, which mixture comprises from 35 to 45% by weight of a didodecyltin-bis- thioglycolic acid ester (C12H25)2Sn(SCH2COO-R)2 and from 65 to 55% by weight of a dodecyltin-tris-thioglycolic acid ester C12H25Sn(SCH2COO-R)3 wherein in each case R represents a straight-chain or branched alkyl radical having from 8 to 20 carbon atoms. The stabiliser mixture is non- toxic and offers advantages in terms of improved stabilising action, reduced migration, and reduced dependence of stabilising action on tin content. The optimum mixture comprises about 40% by weight of the didodecyltin compound and about 60% by weight of the dodecyltin compound.