Process for producing porous films involving a stretching step a

Details Process for producing porous films involving a stretching step a Process for producing porous films involving a stretching step a

1984-12-14

1987-11-10

Anderson, Philip

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 41, 264147, 264154, 2642888, 2642902, 264DIG13, 521134, 521143, 521144, 521149, B29C 6720, B29C 5510

Patent

active

047058137

ABSTRACT:
A process for producing porous films which comprises blending 100 parts by weight of a polyolefin resin with 50 to 500 parts by weight of barium sulfate preferably having an average particle diameter of 0.1 to 7 .mu.m, melting the resulting resin composition and forming it into a film, and then stretching the film at least uniaxially by a factor of 1.5 to 7.

REFERENCES:
patent: 3783088 (1974-01-01), Yoshiyasu et al.
patent: 4472328 (1984-09-01), Sugimoto et al.
The Encyclopedia of Patent Practice and Invention Management Robert Calvert, Edt., New York, Reinhold, 1964, pp. 151-153.

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