The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2004
Filed:
May. 14, 2002
Bernd Sperlich, Walsrode, DE;
Hans Wunderlich, Bomlitz, DE;
Helmut Wagner, Bomlitz, DE;
Willi Schwarz, Bomlitz, DE;
Wipak Walsrode GmbH Co. & KG, Walsrode, DE;
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.