Process for manufacturing viscose

US4287334A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Heinrich Fauth · Mainz, DE
• Werner Koch · Deggingen, DE

Key dates

• Filing date: Dec 10, 1979
• Grant date: Sep 1, 1981
• Expiry date: Dec 10, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B1/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for manufacturing viscose solutions having good filterability and producing low amounts of sulfide gases during subsequent spinning; said process comprising treating cellulose with a first alkali metal hydroxide solution in a first alkalization step, freeing the alkalized cellulose from at least part of the excess hydroxide solution without pressing-off, and treating the cellulose with a second alkali metal hydroxide solution in a second alkalization step while maintaining the temperature of the reaction mixture at not more than 18.degree. C.