Continuous motionless mixer reactor process for the production o

Details Continuous motionless mixer reactor process for the production o Continuous motionless mixer reactor process for the production o

1990-03-28

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

528196, 528204, C08G 6420

Patent

active

050379429

ABSTRACT:
Branched polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, one or more polyhydric 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 branched high molecular weight polycarbonates.

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Dobkowski Zbignew et al., Synthesis of Polycarbonates by Interfacial Method, "Polimeryfwoz wielkoszasteczk.", 1970, No. 8, pp. 428-431 (pp. 5-6).
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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