PROCESS FOR PREPARING LINEAR POLYCARBONATE WITH IMPROVED IMPACT PROPERTIES
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United States of America Patent
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Issued Date -
Sep 15, 2011
app pub date -
Nov 16, 2009
filing date -
Nov 24, 2008
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Abstract
The present invention relates to an improved process for preparing linear polycarbonates having an improved technique for adding a coupling catalyst compound, specifically the addition of the coupling catalyst at two or more separate, different points in the process. Linear polycarbonate resins prepared by said process demonstrate a lower level of polycarbonate oligomers and an improved balance of properties, in particular improved impact strength and lower ductile brittle transition temperature.
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