POLYESTER-POLYCARBONATE COMPOSITION AND ARTICLE

摘要

A composition includes specific amounts of an aromatic polycarbonate, a block polycarbonate-polysiloxane, a poly(alkylene terephthalate), a block polyestercarbonate, and an organophosphate ester. Relative to a corresponding composition lacking the block polyestercarbonate, the composition exhibits improved solvent resistance while substantially maintaining impact strength, melt flow, and flame retardancy. The composition is useful for fabricating articles that may come into contact with liquid chemicals or chemical vapors.

主权项

1. A composition comprising, based on the total weight of the composition:
5 to 50 weight percent of an aromatic polycarbonate; 10 to 40 weight percent of a block polycarbonate-polysiloxane; 5 to 35 weight percent of a poly(alkylene terephthalate); 5 to 50 weight percent of a block polyestercarbonate comprising
a polyester block comprising resorcinol ester repeat units having the structure  anda polycarbonate block comprising carbonate repeat units having the structure wherein at least 60 percent of the total number of R1 groups are aromatic; and 4 to 20 weight percent of an organophosphate ester.