Process for producing cellulose derivatives of high bulk density, good flowability and improved dispersibility in cold water

US9334416B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Yvonne M. Goerlach-Doht · Hamburg, DE
• Juergen Hermanns · Nottensdorf, DE
• Peter E. Pierini · Lake Jackson, US
• Marco Grossstueck · Walsrode, DE
• Michael Schreck · Frankfurt, DE

Key dates

• Filing date: Mar 29, 2012
• Grant date: May 10, 2016
• Expiry date: May 24, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/28
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A particulate cellulose derivative is obtained in a process of grinding and drying a moist cellulose derivative which comprises the steps of A) providing a cellulose derivative having a moisture content of from 60 to 95 percent, based on the total weight of the moist cellulose derivative, B) grinding and partially drying the moist cellulose derivative in a gas-swept impact mill; and C) contacting the ground and partially dried cellulose derivative with an additional amount of a drying gas outside the gas-swept impact mill. The obtained particulate cellulose derivative has a high untapped bulk density and a good flowability.