Heat-sealable, polyolefinic multilayer film, process for the production thereof, and the use thereof

US6558808B1 · kind B1 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Thomas Dries · Bad Kreuznach, DE
• Walter Spaleck · Bocholt, DE
• Andreas Winter · Königstein, DE

Key dates

• Filing date: Feb 21, 1995
• Grant date: May 6, 2003
• Expiry date: Feb 21, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The disclosed heat-sealable, layered film comprises a polyolefinic base layer and at least one outer layer. The outer layer comprises a propylene-olefin copolymer prepared by means of a metallocene catalyst. The film is prepared by coextruding melts corresponding to the individual layers of the film, taking off the coextruded film over a take-off roll whose temperature is between 10 and 90° C., biaxially stretching and then heat-setting the resulting film, and optionally corona- or flame-treating the film, then winding it up in a wind-up unit.