Polycarbonate compositions comprising polyester resins and ultraviolet light absorbers
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United States of America Patent
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May 25, 1999
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N/A
app pub date -
Aug 27, 1997
filing date -
Aug 27, 1997
priority date (Note) -
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Abstract
Weatherable polycarbonate compositions (formulations or blends) comprise polycarbonate, cycloaliphatic polyester resins, at least one of a benzotriazole, benzophenone, and triazine based UVA, and a catalyst quencher. The incorporation of the cycloaliphatic polyester resin and the benzotriazole, benzophenone, and triazine based UVA exhibits a synergistic effect, thereby resulting in unexpected 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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