Sealable, transparent polyolefinic multilayer film
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United States of America Patent
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-
Jan 19, 1988
Grant Date -
N/A
app pub date -
Nov 26, 1985
filing date -
Dec 4, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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