Preparation of gas permeable porous film

Details Preparation of gas permeable porous film Preparation of gas permeable porous film

1987-01-20

1989-03-21

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642106, 2642107, 264284, 2642888, 2642896, 264DIG47, B29C 5502, B29C 6720

Patent

active

048141240

ABSTRACT:
A gas permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simultaneously allowing the stretched film to contract.

REFERENCES:
patent: 3407253 (1968-10-01), Yoshimura et al.
patent: 3679538 (1972-07-01), Orwin et al.
patent: 3758661 (1973-09-01), Yamamoto et al.
patent: 3765999 (1973-10-01), Toyoda
patent: 3903234 (1975-09-01), Ikeda et al.
patent: 4255376 (1981-03-01), Soehngen
patent: 4613643 (1986-09-01), Nakamura

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