Method of forming a porous polyolefin film

Details Method of forming a porous polyolefin film Method of forming a porous polyolefin film

1988-11-02

1990-05-01

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

049216538

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: 3758661 (1973-09-01), Yamamoto
patent: 3903234 (1975-09-01), Ikeda
patent: 4668463 (1987-05-01), Cancio et al.
patent: 4814124 (1989-03-01), Aoyama

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