FLAME RETARD ANT PROPERTIES OF HIGH HEAT POLYCARBONATE RESINS

摘要

Applications such as certain lighting components and face shields require clear materials that offer a combination of high heat resistance and low flammability. The flame performance of a new class of polycarbonates, ranging in Tg from 165°C to 185°C, was evaluated to understand their suitability for such applications. The new high heat polycarbonates showed superior flame performance in comparison to conventional and other high heat polycarbonates. Further, the flame performance was maintained in presence of pigments. The improvements in flame retardant properties did not adversely affect the use temperature with respect to color or molecular weight retention at elevated temperatures. Optimal molding conditions for the resins with respect to color stability were also determined.