Composite material for the production of sealing foils and sealing foils made therefrom

US11718461B2 · kind B2 · utility

Assignee

• Constantia Teich GmbH

Inventors

• Alfred Wegenberger · Langenlois, AT
• Martin Kornfeld · Klosterneuburg, AT
• Adolf Schedl · Lilienfeld, AT
• Matthias Steiner · Seiersberg, AT

Key dates

• Filing date: Jul 7, 2020
• Grant date: Aug 8, 2023
• Expiry date: Jul 7, 2040

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B32B2435/02
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Composite materials, and sealing foils prepared with such composite materials for sealing a container, where the composite materials include an inner layer configured to face the container during sealing, the inner layer being single- or multi-layer, and including a self-contained and closed weakening line; an outer layer that may be single- or multi-layer, and that is configured to be peeled from the inner layer; where an area of the inner layer delimited by the closed weakening line remains attached to the outer layer when the outer layer is peeled from the inner layer, thereby creating a hole in the inner layer; the outermost of the inner layers is in contact with the outer layer, and includes a semicrystalline ethylene-propylene copolymer that is substantially free of dienes; and the innermost of the outer layers is a barrier layer or a lacquer.