Multilayer, stretched heat-sealable polypropylene film

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

B - Operations, Transporting

32

B

B32B 27/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2117138

A MULTILAYER, STRETCHED HEAT-SEALABLE POLYPROPYLENE FILM A b s t r a c t The invention relates to sealable polypropylene films having an improved water vapor barrier effect through the following layer structure: A B C B A where a) C is the base layer of highly isotactic polypropylene with an isotacticity of >94% and a hydrocarbon resin which has a molecular weight of up to about 2000 g/mol and a softening point above 130°C, b) the B's are two jacket layers of highly isotactic polypropylene (isotacticity >94%) free from hydro- carbon 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 homopolymer, copolymer or terpolymer, these surface layers containing at least one antiblocking agent, a lubricant and an antistatic agent.

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