Uniaxially shrinkable biaxially oriented polypropylene film and

Details Uniaxially shrinkable biaxially oriented polypropylene film and Uniaxially shrinkable biaxially oriented polypropylene film and

1995-04-25

1997-11-25

Dye, Rena

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428 349, 4283179, 4283499, 428323, 428327, 428328, 428451, 428516, 428910, B32B 2708, B32B 2732, B32B 516

Patent

active

056910436

ABSTRACT:
A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt % of said multilayer film and at least one polyolefin-containing skin layer adjacent said core layer is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40% in the machine direction. The core layer contains isotactic polypropylene and a modifier which reduces the crystallinity of the polypropylene by increasing chain imperfections or reducing isotacticity of the polypropylene-containing core. Such modifiers can be selected from the group consisting of atactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, propylene-butylene copolymer, ethylene-propylene-butylene terpolymer, and linear low density polyethylene. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butylene terpolymer.

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patent: 5254394 (1993-10-01), Bothe et al.
patent: 5292561 (1994-03-01), Peiffer et al.
patent: 5620803 (1997-04-01), Oyama et al.

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