Multilayer, stretched heat-sealable polypropylene film combining

Details Multilayer, stretched heat-sealable polypropylene film combining Multilayer, stretched heat-sealable polypropylene film combining

1994-03-03

1995-09-05

Buffalow, Edith

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428516, 428910, B32B 712

Patent

active

054477921

ABSTRACT:
The invention relates to oriented, sealable polypropylene film combining an improved water vapor barrier effect with a considerably reduced coefficient of friction for packaging purposes, characterized in that they are free from polydimethyl siloxane and have the following structure:
A B C B A
where
a) C is the core layer consisting of polypropylene and a hydrocarbon resin, which has a molecular weight of up to about 2000 g/mol and a softening point above 130.degree. C., and 0.05 to 0.5% by weight erucic acid amide,
b) the B's are two jacket layers of highly isotactic polypropylene (isotacticity >94%) free from hydrocarbon resin, the ratio between the thickness of the jacket layer and the thickness of the base layer being between 0.01 and 0.1,
c) the A's are two surface layers of a heat-sealable polyolefin copolymer or terpolymer, these surface layers containing at least one antiblocking agent, an antistatic agent and, as lubricant, 0.05 to 0.5% by weight erucic acid amide.

REFERENCES:
patent: 5326625 (1994-07-01), Schuhmann et al.

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