Stabilizer composition comprising a thio-1,3-dicarbonyl compound and a heat stabilizer, and vinyl halide polymer composition stabilized therewith

摘要

A stabilizer composition is disclosed for increasing the resistance to yellowing and loss of clarity of a vinyl halidepolymer upon heating, which comprises a thio-1,3-dicarbonyl compound represented by the formulain which M represents hydrogen, an organotin group or a metal, R represents hydrogen, a hydrocarbon group or a group-C-R'", each of R,R", and R'" represents hydrogen x or an organic group, X is oxygen or sulfur, and n representing thevalence of M is an integer from 1 to 4. and at least one heat stabilizer which is an alkyltin compound or a metal salt of a non-nitrogenous monocarboxylic acid or of a hydrocarbon-substituted phenol.;Stablized vinyl halide polymer compositions, in which the above stabilizer composition is used to improve the resistance to yellowing and the clarity, are also disclosed.