Biaxially oriented polyolefin film, process for its preparation

Details Biaxially oriented polyolefin film, process for its preparation Biaxially oriented polyolefin film, process for its preparation

1994-10-25

1998-05-26

Chen, Vivian

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428 351, 428 357, 428 3692, 428331, 428515, 428516, 428523, 428910, 264345, B32B 2708, B32B 2716, B32B 2720, B32B 2732

Patent

active

057561699

ABSTRACT:
A bowing value, expressed in terms of the curvature, of less than 10 mm is obtained by an additional heat treatment step at temperatures greater than 40.degree. C. to 80.degree. C. after the transverse stretching, the heat-setting and the cooling of the film. The polyolefin film contains a propylene polymer with at least 90% by weight of polypropylene or contains a polypropylene blend.

REFERENCES:
patent: 4311660 (1982-01-01), Barham et al.
patent: 4415523 (1983-11-01), Barham et al.
patent: 5152946 (1992-10-01), Gillette
patent: 5158637 (1992-10-01), Takashige et al.
patent: 5364704 (1994-11-01), Murschall et al.
patent: 5411695 (1995-05-01), Yamada et al.
Database WPI, Derwent Publications Ltd., London, GB; AN 93-231949.
An Attempt to Simulate the Bowing Phenomenon in Tenter with Simple Models, Toshiro Yamada and Chisato Nonomura, Toyobo Co., Ltd., Toyobo Research Institute, pp. 1399-1408 Jul. 1993.

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