Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1996-05-30
1998-08-11
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428352, 428354, 428516, B32B 712, B32B 2132
Patent
active
057925496
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.
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Spec. sheet for Biaxially Oriented Polypropylene Film (BOPP), TORAYFAN, Aug. 1, 1992, 2 pages.
AEP Industries, Inc.
Tarazano D. Lawrence
Thibodeau Paul J.
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