| 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 formula <IMAGE> in which M represents hydrogen, an organotin group or a metal, R represents hydrogen, a hydrocarbon group or a group <IMAGE> each of R, R'', and R''' represents hydrogen or an organic group, X is oxygen or sulfur, and n representing the valence 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. Stabilized vinyl halide polymer compositions, in which the above stabilizer composition is used to improve the resistance to yellowing and the clarity, are also disclosed.
|
