Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1982-06-23
1987-06-02
Spear, Frank
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
21050036, 210640, 521 27, B01D 1300
Patent
active
046701460
ABSTRACT:
A composite hydrophilic membrane comprising a very thin semipermeable hydrophilic membrane containing a sulfonic group and a polyethylenic microporous membrane containing sulfonic group. This hydrophilic membrane has specially high permeation rate of water and excellent separation ability.
The composite hydrophilic membrane is manufactured by a method which comprises fusing a very thin membrane containing an ethylenic copolymer onto the surface of a polyethylenic microporous membrane or a polyethylenic membrane capable of being converted into a microporous membrane thereby forming a composite film, converting the resin film prior to and/or during and/or after sulfonation into a microporous membrane, and causing the composite film to react with a sulfonating agent. This method permits easy and efficient production of the composite hydrophilic membrane.
REFERENCES:
patent: 3679538 (1972-07-01), Druin et al.
patent: 3925332 (1975-12-01), Haito et al.
patent: 3945927 (1976-03-01), Imai et al.
patent: 4199445 (1980-04-01), Chiang et al.
patent: 4409339 (1983-10-01), Matsuda et al.
Inoue Tadashi
Kuwabara Tsumoru
Yoshie Kiyotaka
Asahi Kasei Kogyo Kabushiki Kaisha
Spear Frank
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