Flat permeable membrane and for manufacture thereof

Details Flat permeable membrane and for manufacture thereof Flat permeable membrane and for manufacture thereof

1987-08-12

1990-10-23

Spear, Frank

Liquid purification or separation

Filter

Material

264 41, 210654, B01D 7126

Patent

active

049649914

ABSTRACT:
A flat permeable membrane of polyolefin 10 to 500 .mu.m in thickness, which membrane has compact layers of intimately bound fine particles of polyolefin formed one each in the opposite surface regions of the membrane and a layer of an aggregate of fine discrete particles of an average diameter of 0.01 to 5 .mu.m formed between the compact layers and, consequently, has fine through pores labyrinthically extended in the direction of thickness of the membrane to establish communication between the opposite surfaces of the membrane and a method for the manufacture of the permeable membrane.

REFERENCES:
patent: 3351495 (1967-11-01), Larsen et al.
patent: 3729332 (1973-04-01), Grubb et al.
patent: 3830733 (1972-03-01), Spivack et al.
patent: 3937758 (1976-02-01), Castagna
patent: 4197148 (1980-04-01), Shinomura
patent: 4206050 (1980-06-01), Walch et al.
patent: 4253900 (1981-03-01), Dege et al.
patent: 4401567 (1983-08-01), Shindo et al.
patent: 4438850 (1984-03-01), Kahn
patent: 4539256 (1985-04-01), Shipman
patent: 4613441 (1986-08-01), Kohno et al.
patent: 4743375 (1988-05-01), Seita et al.
EPO 0108601--5/16/84.
EPO 0105629--4/18/84.

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