Sealable, opaque, biaxially orientated multilayer polypropylene

Details Sealable, opaque, biaxially orientated multilayer polypropylene Sealable, opaque, biaxially orientated multilayer polypropylene

1992-05-26

1994-07-05

Buffalow, Edith

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428349, 428402, 428330, 428516, 428910, B32B 712

Patent

active

053266250

ABSTRACT:
A sealable, opaque, biaxially orientated multilayer polpropylene film comprising a core layer and (an) intermediate layer(s) located on one or both sides of the core layer and (a) top layer(s) located on one or both sides of the intermediate layer(s) or the core layer, wherein the core layer contains a polypropylene polymer or a polypropylene mixture and calcium carbonate having an average particle diameter of 1 to 2 .mu.m; the intermediate layer(s) comprise(s) a polypropylene polymer or a polypropylene mixture; at least one top layer has a thickness of .ltoreq.0.4 .mu.m; and the top layer(s) comprise(s) a copolymer of ethylene and propylene or ethylene and butylene or propylene and butylene or ethylene and another .alpha.-olefin having 5 to 10 carbon atoms or propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a terpolymer of ethylene and propylene and butylene or ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a mixture of one or more of the co- and/or terpolymers mentioned with polypropylene or a mixture of two or more of the co- and/or terpolymers mentioned, has a combination of properties rendering it suitable as a packaging or wrapping film.

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