A composition comprising an admixture of
a). an aromatic polycarbonate of intrinsic viscosity of from about 0.35 to about 0.41 dl/g, measured in methylene chloride at about 25°C, said aromatic polycarbonate chain terminated with an endcapping agent which provides the polycarbonate with improved ductility and higher Tg when compared to a paratertiary butyl phenol encapped polycarbonate of the same intrinsic viscosity;
b).a core/shell copolymer comprising a conjugated diene with a Tg of less than or equal to -10°C as the core, said core being about 50 to 90 wt. percent of the core/shell polymer, and grafted thereon a shell comprised of an alkylalkacrylate and a styrenic, the core/shell copolymer present in such quantities to render the said composition ductile in the room temperature 1/8 inch thickness Notched Izod test system under ASTM D-256, and c). a flame retardant combination comprising a flame retardant salt, said combination in quantities sufficient to achieve a UL-94 V-0 or V-1 rating in a molded part 90 mils thick.
一种由以下混合物组成的组合物
a). 一种芳香族聚
碳酸酯,在约 25°C 的
二氯甲烷中测得的固有粘度约为 0.35 至约 0.41 dl/g,所述芳香族聚
碳酸酯链末端有一种封端剂,与具有相同固有粘度的对叔
丁基苯酚封端聚
碳酸酯相比,该封端剂使聚
碳酸酯具有更好的延展性和更高的 Tg;
b).芯/壳共聚物,包括作为芯的 Tg 小于或等于-10°C 的共轭二烯,所述芯约占芯/壳聚合物的 50% 至 90%,以及接枝在其上的由烷基
丙烯酸酯和
苯乙烯组成的壳,芯/壳共聚物的存在量可使所述组合物在 ASTM D-256 规定的室温 1/8 英寸厚度缺口伊佐德测试系统中具有延展性,以及 c).由阻燃盐组成的阻燃组合物,该组合物的用量足以使 90 密耳厚的模塑件达到 UL-94 V-0 或 V-1 等级。