Sealable multilayer films

US4400428A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Heinrich Rosenthal · Walsrode, DE
• Ingo Schinkel · Walsrode, DE
• Gunter Eger · Bad Fallingbostel, DE
• Wolfgang Bair · Walsrode, DE

Key dates

• Filing date: Apr 5, 1982
• Grant date: Aug 23, 1983
• Expiry date: Apr 5, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/3192
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A composite film comprising a polypropylene basis film being laminated at least on one surface with a layer combination of a heat sealable layer with an additive combination, an adhesion promotion layer, a gas-barrier layer, and an adhesion promotion layer and optionally a further heat sealable layer.