Process for making a heterogeneous membrane film

Details Process for making a heterogeneous membrane film Process for making a heterogeneous membrane film

1988-10-19

1990-03-20

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 453, 264 459, 264 461, 2642106, 2642888, B29C 6720

Patent

active

049099710

ABSTRACT:
A film having a porous core layer and nonporous outer layers is made from a composition of certain polymers, particularly ethylene polymers, a particulate filler which has little affinity for the polymer, and optionally an organic compound which decreases the tendency for affinity of the particulate for the polymer. The film is produced by extruding the composition through a die gap of at least 250 .mu.m, and subsequently stretching the film after cooling to a temperature below the melting temperature of the polymer.

REFERENCES:
patent: 4613441 (1986-09-01), Kohno et al.
patent: 4734196 (1988-03-01), Kono et al.
patent: 4743375 (1988-05-01), Seita et al.
patent: 4767580 (1988-08-01), Shingo et al.
patent: 4794128 (1988-12-01), Kawaguchi et al.

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