Polymer compositions, method of manufacture, and articles formed therefrom

Abstract

A polycarbonate composition comprises an elastomer-modified graft copolymer prepared by an emulsion polymerization process in which an elastomer phase is polymerized or copolymerized in the presence of an electrolyte to obtain latex particles that is then grafted with a monomer mixture comprising a monovinylaromatic monomer.

Description

technical field [0001] The present invention relates to polycarbonate thermoplastic compositions having improved resistance to polymer degradation. More specifically, the composition comprises a combination of an aromatic polycarbonate resin and an elastomer-modified graft copolymer. Background technique [0002] Polycarbonate / acrylonitrile-butadiene-styrene (PC / ABS) blends (commercially available from SABIC Innovative Plastics) are an important polymeric material because of their excellent balance of properties, such as, low temperature ductility , heat resistance, and excellent aesthetics combined with easy processing. [0003] However, the polycarbonate portion of this blend is susceptible to degradation by acids and bases, especially under conditions of high heat and humidity. Degradation can cause undesired color formation, loss of molecular weight, reduced chemical resistance or inferior mechanical properties, and generation of volatiles that can cause defects in sur...

AI Technical Summary

Problems solved by technology

[0006] However, due to the relatively low elastomer content in bulk ABS, it generally cannot be used when higher impact resistance is desired, such as is otherwise obtainable by emulsion-prepared ABS

Images