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Title:
POROUS MEMBRANE AND PROCESS FOR ITS MANUFACTURE
Document Type and Number:
WIPO Patent Application WO/1990/003210
Kind Code:
A1
Abstract:
The invention relates to a porous membrane having excellent durability and being useful as an ultrafiltration membrane, which substantially comprises a phenylene sulfide copolymer represented by the formula (-Ph-S-)m(-Ph-X-)n and which has a nonuniform structure wherein a dense layer or layers substantially governing the separating function of the membrane are formed on one side or both sides of the membrane and a porous layer having a larger void volume is formed in contact with said dense layer. In said formula Ph represents a phenylene group, X represents -SO2 - or -CO-, and m and n each represents a natural number.

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Inventors:
HIMESHIMA YOSHIO (JP)
TANISUGI HIDEAKI (JP)
WATANABE TETSUO (JP)
UEMURA TADAHIRO (JP)
KURIHARA MASARU (JP)
Application Number:
PCT/JP1989/000996
Publication Date:
April 05, 1990
Filing Date:
September 29, 1989
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B01D71/66; (IPC1-7): B01D13/00; B01D13/04; D01F6/76; C08J9/28
Foreign References:
JPS63225636A1988-09-20
JPS62213813A1987-09-19
JPS60248202A1985-12-07
JPS5782515A1982-05-24
Other References:
See also references of EP 0417287A1
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