Process for producing sheet-like structures from vinyl alcohol polymers

US4493807A · kind A · utility

Assignee

• BASF SE

Inventors

• Rudolf Vyvial · Ludwigshafen, DE
• Christof Taubitz · Monsheim, DE
• Lothar Schlemmer · Frankenthal (Pfalz), DE
• Gerhard Bleckmann · Lampertheim, DE
• Manfred Zuerger
• Heinrich Krieger · Garmisch-Partenkirchen, DE
• Heino Thiele · Ludwigshafen, DE

Key dates

• Filing date: Nov 22, 1982
• Grant date: Jan 15, 1985
• Expiry date: Nov 22, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S376/901
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A sheet-like structure is produced from a vinyl alcohol polymer by a method wherein, in a self-cleaning multi-screw extruder, the polymer is mixed with a small amount of water, the mixture is melted, homogenized, devolatilized and finally extruded as a melt, and the extrudate is shaped in a conventional manner into the sheet-like structure.