Process for preparing high-molecular weight polyesters

US5468441A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Walter K. Homann · Schneverdingen, DE
• Thomas Gro.beta.e-Puppendahl · Haltern, DE
• Wilhelm Brugging · Recklinghausen, DE

Key dates

• Filing date: Aug 22, 1994
• Grant date: Nov 21, 1995
• Expiry date: Aug 22, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A high-molecular-weight polyester is prepared by polycondensing an aromatic dicarboxylic acid with a mixture of alkanediols and alkenediols with substantial exclusion of oxygen and in the presence of a catalyst, until a viscosity number in the range from 50 to 140 cm.sup.3 /g is reached and then postcondensing the polycondensed material in the solid-phase until the required viscosity number is reached.