Process for producing (co)polycarbonate

Details Process for producing (co)polycarbonate Process for producing (co)polycarbonate

1993-11-30

1995-04-11

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, 528199, C08G 6400

Patent

active

054059348

ABSTRACT:
A process for producing a (co)polycarbonate having excellent thermal resistance, hue and impact resistance and a high molecular weight, which comprises conducting a melt-polycondensation of a dihydroxy compound and a carbonic diester as monomers in the presence of a transesterification catalyst in a tank reactor, while removing a monohydroxy-compound formed by the melt-polycondensation, thereby obtaining a reaction mixture comprising a prepolymer in a molten state (the first step), cooling the molten reaction mixture obtained in the first step to solidify it (the second step), and conducting a melt-polycondensation of the reaction mixture comprising the prepolymer in a horizontal polycondensation reactor, thereby obtaining a reaction mixture comprising a high-molecular-weight (co)polycarbonate (the third step).

REFERENCES:
patent: 4345062 (1982-08-01), Brunelle
Database WPI, Week 9226, Derwent Publications Ltd., London, GB; AN 92-213351 & JP-A-4 142 329 (Daicel Chemical Ind.) 15 May 1992 abstract.
Database WPI, Week 9217, Derwent Publications Ltd., London, GB; AN 92-136812 & JP-A-4 077 549 (Daicel Chemical Ind.) 11 Mar. 1992 abstract.

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