Sealable, opaque polyolefinic multilayer film and process therefor
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United States of America Patent
Stats
-
Mar 24, 1987
Grant Date -
N/A
app pub date -
Dec 5, 1985
filing date -
Dec 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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