Preparation of a polycarbonate by melt-polycondensation of a dih

Details Preparation of a polycarbonate by melt-polycondensation of a dih Preparation of a polycarbonate by melt-polycondensation of a dih

1995-11-16

1997-09-23

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528 4, 528198, 528199, C08G 6400

Patent

active

056706049

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: 4871795 (1989-10-01), Pawar
patent: 5276109 (1994-01-01), Sakashita et al.

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