Polymeric films

Details Polymeric films Polymeric films

1989-08-21

1992-01-07

Buffalow, Edith L.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428349, 4284744, 428483, 428520, 428518, B32B 702

Patent

active

050790722

ABSTRACT:
Polymeric films, especially for packaging, consist of a relatively thick layer of a polyolefin having thereon a relatively thin layer of a blend of a polymer which has a low heat seal strength to polyvinylidene chloride and a copolymer containing units derived from an alkene and an unsaturated mono-basic carboxylic acid or an ester thereof. The relatively thick layer is preferably of polypropylene, and the relatively thin layer is preferably a blend of polyethylene with a copolymer containing at least 74 percent by weight of units derived from ethylene and not more than 36 percent by weight of units derived from acrylic acid or an ester thereof. The relatively thin layer has good anti-block with the relatively thick layer and to other layers such as PVdC applied thereto, and the relatively thin layers have good heat seal strengths to themselves and such other layers.

REFERENCES:
patent: 4678836 (1987-07-01), McKinney et al.
patent: 4909881 (1990-03-01), Garland

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