Process for producing microporous film having breakage resistanc

Details Process for producing microporous film having breakage resistanc Process for producing microporous film having breakage resistanc

1991-08-08

1993-11-02

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

2642107, 2642356, 2642884, 2642888, 264DIG73, B29C 5506, B29C 6720, B29C 7100

Patent

active

052581560

ABSTRACT:
A process for producing a microporous stretched polyolefin film having a large number of micropores, whereby an unstretched polyolefin film is stretched to predetermined strain amount at a constant stretching temperature by using different strain rates in the initial stage to the final stage. A microporous polyolefin film obtained by the above process can retain a film state even at the melting point or higher temperatures when the film is fixed at the periphery.

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