INTERIOR TRAIN COMPONENTS HAVING LOW SMOKE AND LOW HEAT RELEASE, AND METHODS OF THEIR MANUFACTURE

摘要

A railway component comprises a polycarbonate composition comprising: 25 to 90 wt. % of a poly(aliphatic ester-carbonate); a second polymer comprising a poly(carbonate-siloxane) copolymer, a polydialkylsiloxane, a silicone graft copolymer, or a combination comprising at least one of the foregoing, wherein siloxane units in the second polymer are present in the polycarbonate composition in an amount of 0.3 to 3 wt. %, based on the total weight of the polycarbonate composition; and 10 to 50 wt. % of glass fiber, based on the total weight of the polycarbonate composition. The polycarbonate composition has balanced smoke, heat release, mechanical, and aesthetic properties.

主权项

1. A railway component,
wherein the component is a molded or extruded interior train component comprising a polycarbonate composition comprising: 25 to 90 wt. % of a poly(aliphatic ester-carbonate); a second polymer comprising a poly(carbonate-siloxane) copolymer, a polydialkylsiloxane, a silicone graft copolymer, or a combination comprising at least one of the foregoing, wherein siloxane units in the second polymer are present in the polycarbonate composition in an amount of 0.3 to 3 wt. %, based on the total weight of the polycarbonate composition; and 10 to 50 wt. % of glass fiber, based on the total weight of the polycarbonate composition; wherein a sample of the polycarbonate composition has: a smoke density after 4 minutes (DS-4) of less than or equal to 300 determined according to ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2, and a maximum average heat release (MAHRE) of equal to or less than 90 kW/m2 measured according to ISO 5660-1 on a 3 mm thick plaque at 50 kW/m2, and the polycarbonate composition exhibits a gloss measured according to ASTM D2457 at 60° of at least 20.