Process and equipment for preparing swellable cross-linked carboxyalkylcelluloses from natural cellulose or cellulose hydrate and use thereof

US4250306A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Helmut Lask · Wiesbaden, DE
• Arno Holst
• Ehrenfried Nischwitz · Königstein, DE
• Hans Sommer · Coburg, DE

Key dates

• Filing date: May 29, 1979
• Grant date: Feb 10, 1981
• Expiry date: May 29, 1999

Classification

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

Abstract

This invention relates to a process for preparing swellable cross-linked carboxyalkylcelluloses by reacting cellulose, a carboxyalkylating etherifying agent, and a cross-linking agent in an aqueous alkaline medium, comprising effecting alkalizing, etherifying, and cross-linking simultaneously in one reaction step using fibers, textile sheet materials containing these fibers, or sheet materials of other kinds, having a base of cellulose hydrate or of natural cellulose, by contacting said fibers or sheet materials with an ample quantity of an aqueous alkaline reaction mixture, removing part of the reaction mixture from the fibers or sheet materials contacted therewith, so that at least the quantity required for reaction is still present, and treating the fibers or sheet materials containing the remainder of the aqueous alkaline reaction mixture with heat energy. The invention also relates to equipment for performing the process.