Polyolefin film with peelable outer layer

US6749948B2 · kind B2 · utility

Assignee

• Wipak Walsrode GmbH & Co. KG · DE

Inventors

• Bernd Sperlich · Walsrode, DE
• Hans Wunderlich · Karlsruhe, DE
• Helmut Wagner · Duderstadt, DE
• Willi Schwarz · Irvine, US

Key dates

• Filing date: May 14, 2002
• Grant date: Jun 15, 2004
• Expiry date: May 14, 2022

Classification

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

Abstract

A peelable, biaxially oriented, transparent multilayer polyolefin film having at least three layers is described. The peelable, biaxially oriented, transparent multilayer polyolefin film, comprises: (a) a transparent polyolefin base layer; (b) at least one peelable outer layer comprising one of, (i) a polymer selected from at least one of LLDPE, LDPE, MDPE, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and HDPE, and (ii) a combination of at least one propylene co- or terpolymer and at least one ethylenic polymer; and (c) at least one intermediate layer comprising a propylene co- or terpolymer. The intermediate layer (c) of the multilayer film is interposed between the base layer (a) and the peelable layer (b). Also described is a method of preparing the multilayer film, which results in the base layer and intermediate layer(s) being biaxially stretched, and the peelable layer(s) being monoaxially stretched. The multilayer films of the present invention have utility as packaging films.