Process for preparing heat shrinkable polyethylene film

Details Process for preparing heat shrinkable polyethylene film Process for preparing heat shrinkable polyethylene film

1989-06-02

1991-01-15

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264567, 2642358, 2642902, 4253261, B29C 5528

Patent

active

049851977

ABSTRACT:
A process for preparing a heat shrinkable film which is made from a copolymer of ethylene and 0.5 to 10% by mole of an .alpha.-olefin having 4 to 12 carbon atoms, the copolymer having a g* value (i.e., intrinsic viscosity of the copolymer/intrinsic viscosity of a linear polyethylene having the same molecular weight) of 0.3 to 0.7, a melt index of 0.3 to 2.0 g/10 min., and a density at 25.degree. C. of 0.86 to 0.92 g/cm.sup.3, wherein a tubular film of the copolymer is stretched under the following conditions:

REFERENCES:
patent: 3510549 (1970-05-01), Tsuboshima et al.
patent: 3985849 (1976-10-01), Notomi et al.
patent: 4354997 (1982-10-01), Mizutani et al.
patent: 4463153 (1984-07-01), Mizutani et al.
patent: 4597920 (1986-07-01), Golike
patent: 4734245 (1988-03-01), Takashige et al.

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