Heterogeneous membranes from highly filled thermoplastic orienta

Details Heterogeneous membranes from highly filled thermoplastic orienta Heterogeneous membranes from highly filled thermoplastic orienta

1988-03-25

1989-06-27

Foelak, Morton

Liquid purification or separation

Filter

Material

210490, 264 41, 2642888, B01D 1300, B01D 1304

Patent

active

048427411

ABSTRACT:
A film having a porous core layer and nonporous outer layers is disclosed. It is suitable for controlled atmosphere packaging end uses. The film 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.

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