Heat-sealable, stretched composite flims

US4830918A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Ingo Schinkel · Walsrode, DE
• Rudi Klein · Walsrode, DE

Key dates

• Filing date: Apr 3, 1987
• Grant date: May 16, 1989
• Expiry date: Apr 3, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31576
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Heat-sealable composite films, stretched at least uniaxially, comprising a base layer, of a propylene polymer, which is provided on at least one of its surfaces with an adhesion promoter layer and a heat-sealable layer of a thermoplastic polyurethane elastomer.