Polycarbonate compositions comprising hindered amine light stabi

Details Polycarbonate compositions comprising hindered amine light stabi Polycarbonate compositions comprising hindered amine light stabi

1997-09-02

1999-02-09

Gupta, Yogendra N.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524100, 524101, 524102, 524103, 544182, 544385, 544386, 544387, C08K 534, C08K 507, C08K 510, C07D24108

Patent

active

058695540

ABSTRACT:
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.

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patent: 4208522 (1980-06-01), Ramey et al.
patent: 4292240 (1981-09-01), Lai et al.
patent: 4452504 (1984-06-01), Morris et al.
patent: 4480092 (1984-10-01), Lai et al.
patent: 5071981 (1991-12-01), Son et al.

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