Method for preparing polycarbonates containing aliphatic ester groups
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Jun 8, 1990
filing date -
Jun 8, 1990
priority date (Note) -
Expired
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Abstract
Polycarbonates containing aliphatic dicarboxylic ester groups, and having glass transition temperatures and processing temperatures lower than the corresponding homopolycarbonates are prepared via an intermediate which is in turn prepared from a dihydroxyaromatic compound and a C.sub.4-6 aliphatic dicarboxylic acid anhydride, preferably succinic anhydride. Phosgenation of said intermediate produces the desired soft segment polycarbonate.
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