Patent · US Expired

Polyalkylene arylates containing a high proportion of carboxyl end groups

US6232435A · kind A · utility

17Cited by

12References

5Claims

0Family size

Assignee

BASF SE

Inventors

Thomas Heitz · Ludwigshafen am Rhein, DE
Helmut Heel · Schifferstadt, DE
Peter Braune · Speicher, DE
Martin Klatt · Bad Dürkheim, DE

Key dates

Filing date	Sep 14, 2000
Grant date	May 15, 2001
Priority date	—
Expiry date	Sep 14, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/183
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for preparing polyalkylene arylates by esterifying or transesterifying an aromatic dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of an aliphatic dihydroxy compound and polycondensing the resultant esterification or transesterification product comprises polycondensing the prepolymer with a viscosity number (VN) of <30 ml/g in the presence of an oxygen-containing gas.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.