Patent · US Expired

Process for the preparation of aromatic polyethersulphones

US5047496A · kind A · utility

10Cited by

2References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Thomas Eckel · Dormagen, DE
Karl Fuhr · Krefeld, DE
Karl-Heinz Ott

Key dates

Filing date	Jun 13, 1989
Grant date	Sep 10, 1991
Priority date	—
Expiry date	Jun 13, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G75/23
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

This invention relates to a process for the preparation of high molecular weight aromatic polyethersulphones from diphenols and dihalogenoaryls, characterized in that N-alkylated acid amides are used as solvents and at the same time for the azeotropic removal of the water of reaction.

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