Sealable, transparent polyolefinic multilayer film

Details Sealable, transparent polyolefinic multilayer film Sealable, transparent polyolefinic multilayer film

1985-11-26

1988-01-19

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

156229, 15624424, 428220, 428331, 428349, 428354, 428447, 428451, 428516, B32B 702, B32B 2708, C09J 702

Patent

active

047204206

ABSTRACT:
A sealable, transparent polyolefinic multilayer film composed of a polypropylene base layer, a non-sealable surface layer, and a sealable surface layer, and process therefor. The sealable surface layer has a low minimum sealing temperature and is made from a copolymer of propylene and ethylene or butene-1 units and/or a terpolymer of ethylene, propylene and butene-1 units. The non-sealable layer is a combination of a propylene homopolymer, a slip agent, and an anti-blocking agent. The process includes coextruding the three layers, biaxially stretching the coextruded film, and subjecting the non-sealable layer to a corona-discharge treatment.

REFERENCES:
patent: 4230767 (1980-10-01), Isaka et al.
patent: 4293608 (1981-10-01), Isaka et al.
patent: 4297415 (1981-10-01), Ward et al.
patent: 4348457 (1982-09-01), Rosenthal et al.
patent: 4502263 (1985-03-01), Crass et al.
patent: 4595625 (1986-06-01), Crass et al.

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