Matte finish biaxially oriented polypropylene film for cold seal

Details Matte finish biaxially oriented polypropylene film for cold seal Matte finish biaxially oriented polypropylene film for cold seal

1996-06-25

1999-11-09

Thibodeau, Paul

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428336, 428349, 428355R, 428355AC, 428461, 428515, 428516, B32B 2732

Patent

active

059810475

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 release layer is made of (A) about 10% to about 60% by weight ethylene-butylene random copolymer containing between 0% and about 6.0% by weight ethylene and between about 94% and 100% by weight butylene; (B) a blend of two polymers selected from the group consisting of polyethylene ionomers, syndiotactic homopolymer polypropylene, conventional polyethylenes having densities of between 0.91 and 0.965 gm/cm.sup.3, and metallocene-catalyzed polyethylene plastomers; and optionally (C) a non-migratory slip agent present in an amount sufficient to decrease the coefficient of friction of the release layer. Alternatively, the release layer may be made of a two-component blend of the ethylene-butylene random copolymer and high density polyethylene. The packaging films exhibit excellent cold seal release, coefficient of friction, and a matte finish surface without the need for migratory slip additives or an overprint varnish.

REFERENCES:
patent: 3879492 (1975-04-01), Bontinick
patent: 4870134 (1989-09-01), Hwo
patent: 4882229 (1989-11-01), Hwo
patent: 4929680 (1990-05-01), Matsubara et al.

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