Weatherfast pigmented polystyrene

摘要

The invention is directed to weatherable pigmented extruded polystyrene molded or extruded foam articles for use in outdoor applications or applications which require high weatherfastness. The weatherfast pigmented polystryene compositions can be prepared by incorporating by extrusion or molding (a) a foam polystyrene homopolymer or copolymer (b) at least one compound selected from an light absorber, (c) at least one compound selected from the group consisting of low molecular weight hindered amine light stabilizer, (d) at least one compound selected from the group consisting of high molecular weight hindered amine light stabilizer, (e) at least one pigment and (f) optionally carbon black, wherein the expanded polymer foam shows a Delta E color change under xenon weathering over a period of 3000 hours of less than about 3.0.