Interfacial preparation of polycarbonate prepolymer with motionless mixer
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United States of America Patent
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Aug 6, 1991
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N/A
app pub date -
Apr 6, 1990
filing date -
Dec 6, 1988
priority date (Note) -
Expired
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Abstract
Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence time sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form high molecular weight polycarbonates.
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