05792549 is referenced by 42 patents and cites 37 patents.

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.

Title
Biaxially oriented polypropylene cold seal release films
Application Number
8/655542
Publication Number
5792549
Application Date
May 30, 1996
Publication Date
August 11, 1998
Inventor
Andrew F Wilkie
Havermill
MA, US
Agent
Mathews Collins Shepherd & Gould P A
Assignee
AEP
NJ, US
IPC
B32B 21/32
B32B 7/12
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