POLYMER COMPOSITIONS, METHOD OF MANUFACTURE, AND ARTICLES FORMED THEREFROM

摘要

A impact resistant polycarbonate composition comprises an elastomer-modified graft copolymer prepared by an emulsion process in which a composition comprising the elastomer-modified graft copolymer is subjected to treatment with acid to adjust the pH to about 3.0 to about 6.8, following by coagulation of the elastomer-modified graft copolymer and admixture with an aromatic polycarbonate.

主权项

1. A polycarbonate composition having improved resistance to polymer degradation comprising, in admixture, an aromatic polycarbonate and an elastomer-modified graft copolymer made by grafting monomers onto an elastomer, wherein the elastomer-modified graft copolymer is prepared by a process comprising emulsion polymerization of the elastomer and grafting of the monomers to obtain a latex comprising the elastomer-modified graft copolymer followed by coagulation of the latex to obtain a coagulated elastomer-modified graft copolymer, wherein prior to coagulation, the pH of the latex is decreased by at least about 0.5 units to obtain a pH of about 3.0 to about 6.8.