Dispersing auxiliary for preparing cellulose ethers

US4460766A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Utz-Hellmuth Felcht · Bad Soden, DE
• Eberhard Perplies · Eltville am Rhein, DE

Key dates

• Filing date: Nov 19, 1982
• Grant date: Jul 17, 1984
• Expiry date: Nov 19, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B11/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In modern processes for preparing cellulose ethers containing one or more types of substituents, such as MC, CMC, HEC, HPC, MHEC or EHEC, cellulose is reacted with an etherifying agent in the presence of water, base and at least one inert organic solvent (as a dispersing auxiliary). Dimethoxyethane (ethylene glycol dimethyl ether) is employed as a new organic solvent for these syntheses, particularly in quantities of 1 to 30 parts by weight per part by weight of cellulose.