Thermotropic aromatic polyesters with high rigidity, a process for the production thereof and the use thereof for the production of mouldings, filaments, fibres and films

US4614789A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Rudolf Dicke · Bestwig, DE
• Hermann Kauth · Krefeld, DE

Key dates

• Filing date: Jul 17, 1985
• Grant date: Sep 30, 1986
• Expiry date: Jul 17, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermotropic aromatic polyesters with high rigidity and favorable melt viscosity contain condensed radicals of (a) p-hydroxybenzoic acid, (b) hydroquinone and/or 4,4'-dihydroxydiphenyl, (c) isophthalic acid and optionally terephthalic acid and (d) benzophenone dicarboxylic acid in defined weight ratios.