Wire-wetting fall polymonization process for the production of p

Details Wire-wetting fall polymonization process for the production of p Wire-wetting fall polymonization process for the production of p

1996-02-01

1996-12-31

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 62, 526 64, 526 65, 526 67, 528198, C08G 6400

Patent

active

055895646

ABSTRACT:
A method for producing an aromatic polycarbonate comprises feeding to a feeding zone (having a foraminous plate) at least one polymerizing material selected from the group consisting of a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the polymerizing material to pass downwardly through the foraminous plate and fall along and in contact with a wire through a wire-wetting fall polymerization reaction zone, thereby effecting polymerization of the polymerizing material during the wire-wetting fall thereof. Colorless and high quality aromatic polycarbonates are thus stably produced at a high polymerization rate for a prolonged period of time, using an apparatus which has excellent sealing properties under high vacuum and maintenance of which is easy.

REFERENCES:
patent: 2719776 (1955-10-01), Kummei
patent: 3110547 (1963-11-01), Emmert
patent: 3888826 (1975-06-01), Yamana
Database WPI, Derwent Publichations Ltd., London, Great Britain; AN 85-096298(16) & JP-A-60 044 527 (Toyobo KK), 1985.
Database WPI, Derwent Publications Ltd., London, Great Britain; AN 78-24393a(13) & JP-A-53 017 569 (Mitsubishi Chem Ind), 1978.

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