Interfacial preparation of polycarbonate prepolymer with motionl

Details Interfacial preparation of polycarbonate prepolymer with motionl Interfacial preparation of polycarbonate prepolymer with motionl

1990-04-06

1991-08-06

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525462, 528198, 528199, C08G 6420

Patent

active

050379410

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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O. V. Smirnova et al., Polycarbonates, "Khimia" Publishers, 1975, pp. 7-15.
S. J. Chen et al., Chemical Engineering, Mar. 19, 1973, pp. 105-111.

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