Process for producing a porous film

Details Process for producing a porous film Process for producing a porous film

1988-08-08

1990-05-01

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264DIG47, B29C 6720, B29C 5504

Patent

active

049216520

ABSTRACT:
A process for producing a porous film having practically sufficient mechanical strengths, good flexibility, uniform fine pores and high moisture vapor permeability, and further an extremely thin porous film, which process comprises blending 30 to 80 parts by weight of an inorganic fine powder having a specific surface area of 15 m.sup.2 /g or less and an average particle size of 0.4 to 4 .mu.m with 20 to 70 parts by weight of a polyolefin resin, followed by melt-molding the resulting blend into a film and then stretching the film to 2 to 7 times the original length at least in the uniaxial direction.

REFERENCES:
patent: 3903234 (1975-09-01), Ikeda et al.
patent: 3929950 (1975-12-01), Nakamura et al.
patent: 4187210 (1980-02-01), Howard, Jr.
patent: 4350655 (1982-09-01), Hoge
patent: 4704238 (1987-11-01), Okuyama et al.

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