Process for the production of cellulose moulded bodies

US5628941A · kind A · utility

Assignee

• LENZING AKTIENGESELLSCHAFT · AT

Inventors

• Wolfram Kalt · Lenzing, AT
• Heinrich Firgo · Vöcklabruck, AT
• Johann Manner · Vöcklabruck, AT
• Eduard Mulleder · Linz, AT
• Bruno Mangeng · Seewalchen, AT
• Arnold Nigsch · Ludesch, AT
• Franz Schwenninger · Lenzing, AT
• Christoph Schrempf · Eferding, AT

Key dates

• Filing date: Jun 5, 1995
• Grant date: May 13, 1997
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is concerned with a process for the production of cellulose moulded bodies. In this process, cellulose is first dissolved in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldable cellulose solution. Second, the cellulose solution is molded and conducted into an aqueous precipitation bath, wherein the cellulose is precipitated, which produces a moulded body and a spent precipitation bath. Next, the spent precipitation bath is regenerated. This regenerated aqueous amine-oxide solution is re-used to dissolve cellulose, thereby repeating the process. In the above process, the repeated aqueous amine-oxide solution has a pH within certain defined limits.