Sealable polyolefinic multilayer film

US4502263A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• G/u/ nther Crass · Taunusstein, DE
• Siegfried Janocha · Wiesbaden, DE
• Wolfgang Dietz · New Hope, US
• Lothar Bothe · Mainz, DE

Key dates

• Filing date: Dec 16, 1983
• Grant date: Mar 5, 1985
• Expiry date: Dec 16, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31942
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A sealable, transparent, polyolefinic multilayer film comprises a base layer formed of a polypropylene polymer and at least one sealable layer, which contains a propylene copolymer, a low-molecular weight resin, a polypropylene homopolymer and a polydiorganosiloxane. The sealing layer is comprised of a combination of PA1 (a) from about 68.5 to 89.7% by weight, based on the weight of the sealable layer, of an olefin resin composition, comprising an ethylene-propylene-butylene terpolymer and a propylene-butylene copolymer, corresponding to a content of from about 0.1 to 7% by weight of ethylene, 53 to 89.9% by weight of propylene and 10 to 40% by weight of butylene, based on the weight of the olefin resin composition, PA1 (b) from about 5 to 15% by weight, based on the weight of the sealable layer, of a low-molecular weight resin, which compatible with the olefin resin composition, PA1 (c) from about 5 to 15% by weight, based on the weight of the sealable layer, of a propylene homopolymer, and PA1 (d) from about 0.3 to 1.5% by weight, based on the weight of the sealable layer, of a polydiorgano-siloxane.