Process of making stretchable, heat shrinkable polyethylene film
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United States of America Patent
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Jul 21, 1992
Grant Date -
N/A
app pub date -
Aug 15, 1989
filing date -
Apr 10, 1989
priority date (Note) -
Expired
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Abstract
A stretchable, heat shrinkable ethylene-.alpha.-olefin copolymer film which has excellent stretchability as well as shrinkability at a low temperature and is useful as a good packaging material is prepared by melt extruding a composition including at least one ethylene-.alpha.-olefin copolymer as a main component to give a non-stretched film and biaxially stretching the film in a temperature region where an orientation can be induced and at an area stretching ratio of not less than 8 under conditions such that a tensile strength is from 30 to 170 kg/cm.sup.2. The film has an index of refraction N of 1.500 to 1.522, a degree of orientation Wk according to X-ray diffraction method of 0.78 to 0.93 and an area shrinkage of not less than 15% at 90.degree. C.
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