Process for polymerization of thermotropic polyesters and polyes

Details Process for polymerization of thermotropic polyesters and polyes Process for polymerization of thermotropic polyesters and polyes

1983-08-04

1984-10-02

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528173, 528190, 528191, 528193, 528194, 528271, C08G 6318, C08G 6360

Patent

active

044749384

ABSTRACT:
Thermotropic polyesters consisting essentially of units derived from diphenols and aromatic dicarboxylic acids are prepared via monocarboxylic acid esters of the diphenols by acidolysis in two steps. The first step is a melt prepolymerization to form a prepolymer of inherent viscosity in the range of 0.12 to 0.16 dl g.sup.-1. The second step is a melt polymerization by a single pass through a wiped film reactor, in which the film of polymer melt is subjected to a high rate of shear and to a temperature in the range within which the polyester forms an anisotropic melt phase. The polyester product has an inherent viscosity of at least about 0.5 dl g.sup.-1.

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patent: 4319017 (1982-03-01), Kosanovich
patent: 4377681 (1983-03-01), Deex
patent: 4390681 (1963-06-01), Deex

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