BLENDS OF POLYCARBONATE WITH CO-POLYCARBONATE OF BISPHENOL A AND 4,4'-DIHYDROXYDIPHENYL

摘要

In comparison to a bisphenol A (BPA) based polycarbonate and a co-polycarbonate of BPA and 4, 4'-dihydroxydiphenyl, transparent blends of polycarbonate with 20 to 40 weight % of co-polycarbonate have a higher notched Izod impact strength at low temperatures and thick section. Surprisingly, a blend containing 70% of co-polycarbonate has shown more resistance to embrittlement after heat aging at 130°C for 20 days than all other blends. Its resistance to embrittlement is, indeed, comparable to the outstanding resistance of co-polycarbonate by itself.