PROCESS FOR POLYMERIZATION OF THERMOTROPIC POLYESTERS

PROCESS FOR POLYMERIZATION OF THERMOTROPIC POLYESTERS

PROCESS FOR POLYMERIZATION OF THERMOTROPIC POLYESTERS ABSTRACT Thermotropic polyesters consisting essen-tially 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 prepolymeri...

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Bibliographische Detailangaben
1. Verfasser: RICHARDSON, JOHN C
Format: Patent
Sprache:eng ; fre
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Zusammenfassung:PROCESS FOR POLYMERIZATION OF THERMOTROPIC POLYESTERS ABSTRACT Thermotropic polyesters consisting essen-tially 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-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-1.