Methods of making thick, highly oriented, opaque, low-density, microporous polyolefin films and the films made thereby
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
Apr 28, 2004
filing date -
May 8, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of making a polyolefin film in accordance with this invention includes the steps of: blending a propylene block copolymer with a beta nucleating agent; extruding a film layer from the blend and providing a total area draw ratio in excess of 20, where at least one part of the stretching occurs at <120.degree. C., for forming the film with a density no greater than 0.40 g/cm.sup.3 and a thickness greater than 160 gauge. The film also constitutes a part of this invention
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