Aliphatic thio additive for polycarbonate

A composition of matter comprising, in admixture, a carbonate polymer and an amount of an aliphatic thio compound,

• described by the formula
• C.sub.a H.sub.2a+1 --S--R--S--C.sub.b H.sub.2b+1, where a is independently an integer from 4 to 30 inclusive, b is independently an integer from 4 to 30 inclusive, R is a chain or cyclic hydrocarbon radical represented by either C.sub.d H.sub.2d or C.sub.g H.sub.2g-2, and d or g is independently an integer from 3 to 12 inclusive,
• effective to protect an article molded from said composition from the occurrence of surface defects caused by adhesion of such article to a mold, or (b) reduce the yellowness index and haze percent of said composition, as measured by ASTM Designation D 1925-70, as compared to polycarbonate not admixed with said aliphatic thio compound, or (c) accomplish both said items (a) and (b).