Process for the manufacture of water-absorbing cellulose ethers

US4068068A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Arno Holst
• Helmut Lask · Wiesbaden, DE
• Michael Kostrzewa · Wiesbaden, DE

Key dates

• Filing date: May 3, 1976
• Grant date: Jan 10, 1978
• Expiry date: May 3, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B15/005
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to an improvement in the process for the manufacture of water-adsorbing but at least partially water-insoluble cellulose ethers in which cellulose is alkalized in a liquid reaction medium and reacted with an etherification agent in a manner such that an at least preponderantly water-soluble cellulose ether would be obtained in the case of a mere etherification process and in which, prior to, simultaneously with, or after the etherification process, a reaction is effected with a crosslinking agent which is polyfunctional towards cellulose in an alkaline reaction medium, The improvement comprising employing bis(acrylamido)-acetic acid as the crosslinking agent.