Process for etherifying cellulose with alkyl monochloroacetates

US4526961A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

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

Key dates

• Filing date: Sep 30, 1983
• Grant date: Jul 2, 1985
• Expiry date: Sep 30, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B11/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a process for preparing water-soluble sodium carboxymethyl cellulose (NaCMC), including mixed ethers of NaCMC, by etherifying cellulose with alkyl monochloroacetates in an aqueous-alkaline dispersion containing at least one organic solvent. In the process, cellulose is first alkalized in an aqueous-alkaline dispersion, which optionally already contains the organic solvent. Subsequently, the alkali cellulose is reacted essentially with an alkyl monochloroacetate as the etherifying agent, in the presence of the organic solvent.