Sealable, opaque polyolefinic multilayer film and process theref

Details Sealable, opaque polyolefinic multilayer film and process theref Sealable, opaque polyolefinic multilayer film and process theref

1985-12-05

1987-03-24

Buffalow, Edith

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428349, 428447, 428516, 428910, 428 35, 427 39, 2642902, 15624417, 15624414, 525240, B32B 702

Patent

active

046524894

ABSTRACT:
A sealable, opaque 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 and a slip agent. The base layer contains an additive which is incompatible with polypropylene. The process includes stretching of the film, and during the stretching step, the polymer matrix is torn open around the additive particles to form vacuoles which give the base layer a degree of opacity.

REFERENCES:
patent: 4230767 (1980-10-01), Isaka et al.
patent: 4293608 (1981-10-01), Isaka et al.
patent: 4303708 (1981-12-01), Gebhardt et al.
patent: 4340641 (1982-07-01), Weiner
patent: 4348457 (1982-09-01), Rosenthal et al.
patent: 4502263 (1985-03-01), Crass et al.

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