Method for the manufacture of flat permeable membrane

Details Method for the manufacture of flat permeable membrane Method for the manufacture of flat permeable membrane

1988-01-21

1990-05-22

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

21050036, 2642106, 26421119, 264216, 264234, B29C 6720

Patent

active

049275763

ABSTRACT:
A method of manufacture of flat permeable membrane comprises the steps of mixing a polyolefin, an organic filler uniformly dispersible in the polyolefin in the molten state, and crystal seed forming agent for the polyolefin; discharging the resultant mixture in the molten state through a die; bringing one surface of the discharged molten membrane into contact with a cooling roll; placine the cooled and solidified flat membrane into contact with an extractant capable of dissolving and extracting the organic filler and capable of dissolving the polyolefin; and subjecting the cooled and solidified flat membrane in a fixed state in longitudinal and lateral directions to a heat treatment at a temperature 20.degree. to 50.degree. C. lower than the melting point of the polyolefin.

REFERENCES:
patent: 3937758 (1976-02-01), Castagna
patent: 4100238 (1978-07-01), Shinomura
patent: 4253900 (1981-03-01), Dege et al.
patent: 4402940 (1983-09-01), Nose et al.
patent: 4438850 (1984-03-01), Kahn
patent: 4702917 (1987-10-01), Schindler

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