CPC B32B 27/08 (2013.01) [B32B 27/285 (2013.01); B32B 27/302 (2013.01); B32B 27/32 (2013.01); B32B 2307/206 (2013.01); B32B 2307/3065 (2013.01); B32B 2307/71 (2013.01); B32B 2457/08 (2013.01); B32B 2457/10 (2013.01); B32B 2457/12 (2013.01); B32B 2605/10 (2013.01); B32B 2605/18 (2013.01)] | 14 Claims |
1. A multilayer sheet, comprising:
a core layer comprising a composition comprising about 60 to about 90 weight percent of polyphenylene, about 0 to about 20 weight percent of polystyrene, about 10 to about 20 weight percent of a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene, and optionally, a flame retardant additive;
a first cap layer disposed on a surface of the core layer, wherein the first cap layer comprises polypropylene; a second cap layer disposed on another surface of the core layer, wherein the second cap layer comprises polypropylene
wherein the hydrogenated block copolymer has a weight average molecular weight of 100,000 to 150,000; and wherein the hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene comprises a polystyrene-poly(ethylene-butylene) diblock copolymer, a polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer, a polystyrene-poly(ethylene-butylene-styrene)-polystyrene tapered block copolymer, or a combination comprising at least one of the foregoing; and wherein thermal shrinkage of the multilayer sheet at 150° C. for 30 minutes is less than or equal to 0.5% in the machine direction and less than or equal to 0.4% in the transverse direction.
|