Sealable multilayer film for packaging purposes

US4595625A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunther Crass · Taunusstein, DE
• Lothar Bothe · Mainz, DE
• Siegfried Janocha · Wiesbaden, DE
• Wolfgang Dietz · New Hope, US

Key dates

• Filing date: Aug 30, 1984
• Grant date: Jun 17, 1986
• Expiry date: Aug 30, 2004

Classification

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

Abstract

Disclosed is a sealable transparent multilayer film, comprising: a base layer comprised of a propylene polymer and at least one sealable layer comprised of a combination of: PA1 (a) from about 67.5 to 89.6% by weight, relative to the weight of the sealable layer, of an olefin resin composition comprised of a co- or terpolymer of ethylene, propylene, butylene or another alpha-olefin having 5 to 10 carbon atoms or of a mixture of said polymers, PA1 (b) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a low molecular weight resin which is compatible with the olefin resin composition, PA1 (c) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a propylene homopolymer, PA1 (d) from about 0.3 to 1.5% by weight, relative to the weight of the sealable layer, of a polydiorganosiloxane, and PA1 (e) from about 0.1 to 1.0% by weight, relative to the weight of the sealable layer, of a silicate having the shape of platelets. Also disclosed is a process for the high-speed wrapping of articles utilizing the film according to the invention.