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Title:
SEMIPERMEABLE MEMBRANE AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH01115407
Kind Code:
A
Abstract:

PURPOSE: To obtain the title semipermeable membrane having open cells in its thickness direction and having reticular structure without requiring an additive, etc., by forming the membrane from a mixture contg. a specified weight ratio of polyaryl resin and polysulfone resin.

CONSTITUTION: (A) The polyaryl resin having a repeating unit shown by formula I or (B) the polysulfone resin having a repeating unit shown by formula II or III are mixed in the weight ratio A/B=0.1W10 (in the formulas IWIII, R1WR4 are a 1W5C lower alkyl group). The mixture is dissolved in a solvent such as N-methylpyrrolidone to obtain a membrane forming soln., the soln. is cast on a glass sheet, the sheet is immediately dipped in the liq. coagulant consisting of water, N-methylpyrrolidone, etc., to gel the soln., the gel is washed with water to remove the solvent, and a membrane is formed. The semipermeable membrane thus obtained has the pores having ≤0.05μm pore diameter on the surface, and forms fibrillar structure in the cross-sectional direction of the membrane.


Inventors:
YOSHIDA MASASHI
KIDA FUMIO
OKAMURA KIYOUJI
Application Number:
JP27167087A
Publication Date:
May 08, 1989
Filing Date:
October 29, 1987
Export Citation:
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Assignee:
NIKKISO CO LTD
International Classes:
A23C1/01; A61M1/16; B01D67/00; B01D69/02; B01D71/48; B01D71/68; C08J5/18; D01F6/62; D01F6/92; D01F6/94; (IPC1-7): A23C1/01; A61M1/16; B01D13/00; B01D13/04; C08J5/18; D01F6/62; D01F6/92; D01F6/94
Attorney, Agent or Firm:
Naoki Fukumura