Polycarbonate compositions comprising elastomer-modified graft copolymer prepared by emulsion polymerization

摘要

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.

主权项

1. An impact resistant polycarbonate composition having improved resistance to polymer degradation comprising an aromatic polycarbonate in admixture with an elastomer-modified graft copolymer that is a product of a process comprising emulsion polymerization in the presence of an electrolyte that is a potassium or sodium salt of an anion selected from the group consisting of phosphate or bicarbonate, and combinations thereof, wherein the elastomer-modified graft copolymer in the impact resistant polycarbonate composition contains residual amounts of the electrolyte;
wherein after aging in an oven for 1000 hours at 90±2° C. and 95±3% RH, the melt flow rate (MFR) of the polycarbonate composition does not change by more than 5.0 g/10 minutes units measured in accordance with ISO 1133 standard at 230° C. using a 3.8 kg load and 300 sec dwell time.