B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/08 (2006.01) B32B 27/32 (2006.01)
Patent
CA 2117139
A MULTILAYER, STRETCHED HEAT-SEALABLE POLYPROPYLENE FILM COMBINING GOOD SURFACE SLIP WITH IMPROVED BARRIER PROPER- TIES A b s t r a c t The invention relates to oriented, sealable polypro- pylene 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 struc- ture: 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°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 hydrocar- bon 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.
Albinus Eberhard
Brandt Rainer
Krallmann Anton
Neelen Neele
Reiners Ulrich
Fetherstonhaugh & Co.
Wolff Walsrode Ag
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