Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
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.
Coughlin Michael C.
Moss Arthur Z.
Stevens Kenneth E.
Du Pont Canada Inc.
Lorin Hubert C.
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