C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/176, 400/750
C08G 64/24 (2006.01)
Patent
CA 1305578
ABSTRACT This invention relates to polycarbonate prepolymers which 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 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. 35,163-F
574740
Aguilar Jose Louis
Smith Ronald R. II
Weston John W.
Smart & Biggar
The Dow Chemical Company
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