Broad sealing multi-layered opp films which yield hermetic seals

Details Broad sealing multi-layered opp films which yield hermetic seals Broad sealing multi-layered opp films which yield hermetic seals

1990-06-11

1991-09-17

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428215, 428216, 428331, 428349, 428461, 428516, B32B 702

Patent

active

050494368

ABSTRACT:
A multilayer film is hermetically heat sealable over a broad temperature range. In one embodiment, a heat sealable layer is provided to a polypropylene core layer. The heat sealable layer comprises an ethylene-propylene copolymer and/or an ethylene-propylene-butene terpolymer with an inorganic antiblock agent having a particle size of at least 0.8 micron and at least about 1000 ppm of a fatty acid amide, the layer having a thickness of at least about 10-25% of the total film thickness. A metal-receiving layer may be provided to a surface of the core layer opposite the heat-sealable layer and the film may be metallized.

REFERENCES:
patent: 4604322 (1986-08-01), Reid
patent: 4618527 (1986-10-01), Doyen
patent: 4692380 (1987-09-01), Reid
patent: 4888237 (1989-12-01), Balloni et al.

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