Process for producing a crosslinked cellulose ether

US12428498B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Alexandra Hild · Soltau, DE
• Joerg Neubauer · Rheydt, DE
• Sonja Menz · Brelingen, DE

Key dates

• Filing date: Apr 17, 2020
• Grant date: Sep 30, 2025
• Expiry date: Jul 23, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L1/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing a crosslinked cellulose ether including the steps of: (a) contacting at least one cellulose material with at least one alkalization reagent to form an activated cellulose material; (b) contacting the activated cellulose material of step (a) with at least one etherification reagent to form an uncrosslinked cellulose ether; (c) subjecting the cellulose ether of step (b) to a simultaneous or stepwise washing and/or granulating step; (d) adding at least one crosslinking agent to the uncrosslinked cellulose ether during the washing and/or granulating of step (c) to form a crosslinked cellulose ether; and (e) any other optional components desired; and a crosslinked cellulose ether produced by the above process.