Biaxially stretched multilayer film and process for manufacturing same
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United States of America Patent
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Dec 21, 1993
Grant Date -
N/A
app pub date -
Apr 19, 1991
filing date -
Apr 27, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tubular multilayer film including at least two, biaxially stretched tubular layers each formed of a polypropylene resin, wherein the innermost layer contains spherical antiblocking agent particles having an average particle size of 0.2 to 5 .mu.m in an amount of 0.1 to 0.7% by weight, and the outermost layer is free of the spherical antiblocking agent particles is disclosed. The multilayer film may be prepared by biaxially stretching a multilayer tubular raw sheet having an innermost polypropylene layer containing spherical antiblocking agent particles and an outermost polypropylene layer free of such antiblocking agent particles.
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