Polycarbonate compositions comprising hindered amine light stabilizers and ultraviolet light absorbers

摘要

Weatherable polycarbonate compositions (formulations or blends) comprise at least one of a piperazinone and piperazine dione based HALS, and at least one of a benzotriazole, benzophenone, triazine, oxanilide, and cyanoacrylate based UVA. The combination of these HALS and UVA exhibits a synergy that results in enhanced protection of the polycarbonate compositions by imparting photostability to the polycarbonate formulations, thereby reducing yellowing or other forms of light induced degradation.