Process for the preparation of polycarbonate

Details Process for the preparation of polycarbonate Process for the preparation of polycarbonate

1994-03-11

1995-11-14

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528199, 528272, 528275, 528322, 528332, C08G 6306

Patent

active

054667755

ABSTRACT:
A process for preparing a substantially chloride-ion-free, high-molecular-weight, colorless and transparent polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which comprises using a carbonic diester which is substantially free from (A) phenyl salicylate, o-phenoxybenzoic acid and phenyl o-phenoxybenzoate, (B) tin ion, (C) methyl phenyl carbonate or (D) phenyl salicylate and o-phenoxybenzoic acid.
A process for preparing a thermally stable polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which comprises using a borate or, a compound selected from the group consisting of electron-donative amines and salts thereof as a catalyst, and optionally an acidic substance.

REFERENCES:
patent: 3492268 (1970-01-01), Baker
patent: 5288838 (1994-02-01), Sivaram et al.
Patent Abstracts of Japan; vol. 16, No. 342 (C-0966) Jul. 24, 1992 and JP-A-04 100 824 (Asahi Chem. Ind. Co. Ltd.) Apr. 2, 1992.
Journal of the Chemical Society; Section B: Physical Organic Chemistry, vol. 1, 1968, pp. 40-45, Letchworth GB, Davis et al.
Ullmann's Encyclopedia of Industrial Chemistry; vol. A21, 1992, pp. 207-215.

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