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Patent Searching and Data


Title:
PREPARATION OF POROUS POLYSULFONE MEMBRANE
Document Type and Number:
Japanese Patent JPS5958041
Kind Code:
A
Abstract:

PURPOSE: To prepare the titled porous membrane having excellent permeability and suitable as a membrane filter and a blood-treatment membrane, by forming a solution composed of a polysulfone resin, a solvent of the resin, a cationic metal salt, and an alcohol in the form of a film, and coagulating the film in a coagulation bath.

CONSTITUTION: A polysulfone resin solution is prepared by mixing (A) a polysulfone resin preferably a polymer containing ≥50mol% of the recurring unit of formula I or formula II with (B) a solvent which dissolves ≥15wt% of the polysulfone resin at ≤50°C, (C) a univalent or bivalent cationic metal salt, and (D) a 2W15C monohydric alcohol. The concentration of the resin, the salt and the alcohol in the resin solution are 8W35wt%, 0.3W7wt% and 15W55wt%, respectively, and the weight ratio of alcohol/polysulfone resin is ≥2.5. The solution is cast or spun at a temperature near the clouding point (±30°C) to form a membrane, and the product is immersed and coagulated in a coagulation bath (water or an aqueous organic liquid) to obtain a porous membrane having micropores with 0.05W5μ diameter at the surface layer.


Inventors:
UEDA FUMIO
MORI KOU
Application Number:
JP16749582A
Publication Date:
April 03, 1984
Filing Date:
September 28, 1982
Export Citation:
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Assignee:
TEIJIN LTD
International Classes:
C08J9/28; B01D71/68; (IPC1-7): B01D13/04; C08J9/28
Attorney, Agent or Firm:
Maeda Junhiro