Thiodiphenol copolycarbonates and their use as components of multilayered polymeric reflective bodies
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Dec 14, 1994
filing date -
Jun 24, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides novel copolycarbonates that exhibit improvements in glass transition temperature, refractive index, and limiting oxygen index compared to prior art thiodiphenol/bisphenol A copolycarbonates. The copolycarbonates of this invention comprise the reaction products of 4,4'-thiodiphenol and compounds such as 9,9-bis (4-hydroxyphenyl) fluorene with phosgene. They are useful as components of multilayered polymeric reflective bodies.
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