Multilayer film with a gas and aroma barrier layer and a process for the preparation and application thereof

US4572854A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hermann Dallmann · Wiesbaden, DE
• Hans J. Palmer · Eltville am Rhein, DE

Key dates

• Filing date: Feb 25, 1986
• Grant date: Feb 25, 1986
• Expiry date: Feb 25, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31928
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention concerns a multilayer, preferably sealable film, comprising one or more inner layers; more specifically, (1) an inner barrier layer D containing a saponified ethylene-vinyl acetate polymer having 15 to 60 mole % ethylene units and being saponified to at least 90 mole %; and (2) at least one layer immediately adjacent to the surface of the barrier layer D, which layer is an adhesion-promoting layer C and comprises a modified polymer or the modified polyolefin. All layers of the film are oriented at least biaxially under identical conditions. On one side of the barrier layer D, adjacent to the first adhesion-promoting layer C, a first layer B is located, and an optionally, a sealable layer A, is adjacent thereto. Layer B contains a polypropylene homopolymer and/or a propylene copolymer and/or the material of the layer C and/or the material of the optional layer A. Also disclosed is a process for the preparation of a multilayer film as described, and its use, in particular, in the packaging of oxygen-sensitive goods.