Multilayer oriented heat-sealable polypropylene film

US5665469A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Rainer Brandt · Walsrode, DE
• Ulrich Reiners · Neuenkirchen, DE

Key dates

• Filing date: Nov 30, 1995
• Grant date: Sep 9, 1997
• Expiry date: Nov 30, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to an oriented, particularly a biaxially oriented, sealable, metallisable multilayer film, characterised in that it is built up as follows: PA0 ABCBD PA0 a) where C is the core layer comprising isotactic polypropylene with an MFI between 0.5 and 4.5 g/10 min, PA0 b) A is the base layer for vacuum evaporation, comprising 0.1-0.5% of an organic or inorganic spacer and 1 to 10% of an ethylene/octene copolymer with a density <0.915 g/cm.sup.3, and 89.5 to 98.9% of a heat-sealable propylene/ethylene copolymer with an ethylene content of 1 to 8%, PA0 c) B represents the two intermediate layers comprising a propylene homopolymer with an MFI between 2 and 12 g/10 min, PA0 d) and D is the sealable layer comprising an olefinic homo-, co- or terpolymer and 0.1 to 0.5% of an inorganic or organic spacer, or a mixture of the two classes of spacer. The film is desirably metallized with a metal or metal oxide layer.