Shrink films of ethylene/.alpha.-olefin copolymers

Details Shrink films of ethylene/.alpha.-olefin copolymers Shrink films of ethylene/.alpha.-olefin copolymers

1984-04-09

1986-07-01

Seccuro, Carman J.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

2642884, 2642896, 2642902, 525240, 5263481, 5263482, 5263484, C08J 518, C08L 2318, C08F 1014

Patent

active

045979200

ABSTRACT:
A shrink film having high optical clarity, good shrink properties, and good mechanical properties is obtained by stretching biaxially, without prior crosslinking, a film made of a copolymer of ethylene with at least one C.sub.8 -C.sub.18 .alpha.-olefin, which copolymer has two distinct crystallite melting points below 128.degree. C., the difference between these melting points being at least 10.degree. C., and stretching being carried at a temperature within the range defined by these melting points. The above copolymer may be blended with a homopolymer of an .alpha.-olefin or copolymer with another .alpha.-olefin or another ethylenically unsaturated comonomer, which may constitute up to about 95 weight % of the blend. The shrink film of this invention is particularly suitable for wrapping consumer goods which have to maintain good sales appeal.

REFERENCES:
patent: 3141912 (1964-07-01), Goldman et al.
patent: 3299194 (1967-01-01), Golike
patent: 3663662 (1972-05-01), Golike et al.
patent: 4076698 (1978-02-01), Anderson et al.
patent: 4128607 (1978-12-01), Shiomura et al.
patent: 4205021 (1980-05-01), Morita et al.
Dowlex.RTM. Polyethylene Resins Bulletin, pp. 1, 2, 11, Dow Chem. Co., 1979.

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