Heat-sealable multilayer polypropylene resin film and...

Details Heat-sealable multilayer polypropylene resin film and... Heat-sealable multilayer polypropylene resin film and...

2006-04-19

2011-10-25

Le, Hoa (Holly) (Department: 1788)

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

C428S516000

Reexamination Certificate

active

08043712

ABSTRACT:
[Problem] Provision of a heat-sealable multilayer polypropylene-based resin film having heat seal strength sufficient for packaging a heavy article and tight-sealing property, and a packaging material using the film.[Solving means] A heat-sealable multilayer polypropylene-based resin film comprising a crystalline polypropylene-based resin and a propylene-α-olefin copolymer, which is an oriented polypropylene-based resin film made of a laminate of 3 or more layers of a substrate layer having a melting point of 155° C. or less, an intermediate layer and a thermal adhesion layer having a melting point of 150° C. or less, wherein the intermediate layer has a xylene-soluble content of 2.5% or less, the substrate layer has a melting point higher than that of the intermediate layer, and the intermediate layer has a thickness of 4 μm or above.

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