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:
Aug. 11, 1998
Filed:
May. 30, 1996
Andrew F Wilkie, Havermill, MA (US);
AEP Industries, Inc., South Hackensack, NJ (US);
Abstract
A coextruded biaxially oriented polyolefin packaging film has a cold seal release layer, a core layer, and a cold seal receptive skin layer. The cold seal release layer is fabricated of about 1% to about 80% by weight polyolefin polymer selected from isotactic homopolymer polypropylene, syndiotactic homopolymer polypropylene, homopolymer polyethylene, ethylene-alpha-olefin copolymers made by metallocene catalysis, e.g. ethylene-butylene (plastomers), blends of plastomers with syndiotactic homopolymer polypropylene, blends of syndiotactic homopolymer polypropylene with ethylene-propylene random copolymer, and mixtures thereof. In addition, the release layer contains from about 20% to about 99% by weight polybutylene-polyethylene copolymer containing between about 0.5% and about 6.0% by weight ethylene and between about 94% and about 99.5% by weight butylene, and optionally an effective amount of non-migratory slip agent. Other films are provided which are made of 1% to 80% by weight of a polymer selected from ethylene-alpha olefin copolymers made by metallocene catalysis, e.g. ethylene-butene (plastomers), and ethylene-propylene random copolymers, and 20% to 99% by weight of syndiotactic polypropylene. The packaging films exhibit excellent cold seal release and coefficient of friction properties without using migratory slip additives or an overprint varnish.