Method for cold-milling cellulose derivatives

US4044198A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Kostrzewa · Wiesbaden, DE
• Arno Holst
• Gerhard Buchberger · Niedernhausen, DE

Key dates

• Filing date: Mar 6, 1975
• Grant date: Aug 23, 1977
• Expiry date: Mar 6, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S241/37
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

This invention relates to an improvement in the method for the cold-milling of a cellulose derivative, in which the cellulose derivative is cooled by means of liquid nitrogen until it becomes brittle and the thus cooled cellulose derivative is milled in a mill, the improvement comprising cold-milling a cellulose derivative which is soluble or swellable in water and has a water content of between 40 and 150 percent by weight, based on its dry weight, and which is, at 20.degree. C, able to absorb, during swelling, more than 150 percent by weight of water, based on its dry weight.