Process for producing porous polymer film

Details Process for producing porous polymer film Process for producing porous polymer film

1976-08-02

1978-08-08

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

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

Making hole or aperture in article

264147, 264DIG47, B29D 2700, B29D 724

Patent

active

041057376

ABSTRACT:
A porous polymer film having many fine voids which are flat in the thickness direction can be prepared by forming many fine cracks in a stretchable polymer composition having a fine phase separation structure, heating the thus treated polymer composition to its stretching temperature under tension, and then stretching the polymer composition at the temperature.

REFERENCES:
patent: 3441638 (1969-04-01), Patchell et al.
patent: 3468461 (1969-09-01), Rasmussen
patent: 3679538 (1972-07-01), Druin et al.
patent: 3903234 (1975-09-01), Ikeda et al.

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