Cellulose solution in water and NMMO

US5189152A · kind A · utility

Assignee

• LENZING AKTIENGESELLSCHAFT · AT

Inventors

• Peter Hinterholzer · Neumarkt am Wallersee, AT
• Stefan Zikeli · Regau, AT
• Heinrich Firgo · Vöcklabruck, AT
• Bernd Wolschner · Vöcklabruck, AT
• Dieter Eichinger · Vöcklabruck, AT
• Johann Manner · Vöcklabruck, AT
• Stephan Astegger · Vöcklabruck, AT
• Karin Weinzierl · Vöcklabruck, AT

Key dates

• Filing date: Jul 16, 1991
• Grant date: Feb 23, 1993
• Expiry date: Jul 16, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A solution of cellulose in water and N-methylmorpholine-N-oxide (NMMO) containing 2 to 44% by weight cellulose is stabilized at 0.01 to 1%, preferably 0.1% H.sub.2 O.sub.2 and 0.01 to 2%, preferably 0.1% of an H.sub.2 O.sub.2 stabilizer, preferably oxalic acid or a salt thereof during formation of the solution and during heating to prevent discoloration of the cellulose and reduce the composition of NMMO.