Method for producing a suspension in water of a cellulose ether, and dry mixture suitable for use in the production of the suspension

US5837864A · kind A · utility

Assignee

• AKZO NOBEL N.V. · NL

Inventors

• Lars Andersson · Knivsta, SE
• Peter Bostrom · Ytterby, SE

Key dates

• Filing date: Jun 10, 1997
• Grant date: Nov 17, 1998
• Expiry date: Jun 10, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a method of producing a suspension of a nonionic cellulose ether that has no turbidity point, the water forming part of the suspension is mixed with a dry mixture containing a cellulose ether, which is cross-linked with glyoxal, and an electrolyte salt. This electrolyte salt consists of a salt of a mixture of salts which, in water and at the concentration employed, results in a pH value below 8.0. Preferably, the cellulose ether is a hydroxyethylcellulose.