Title:
PRODUCTION OF CELLULOSE ESTER HOLLOW FIBER MEMBRANE
Document Type and Number:
Japanese Patent JP2818366
Kind Code:
B
Abstract:
PURPOSE: To produce a cellulose ester hollow fiber membrane useful for a ultrafiltration method or dialytic method.
CONSTITUTION: In a hollow fiber membrane producing method extruding a spinning dope prepared by dissolving cellulose ester in a mixed soln. consisting of an org. solvent and a swelling agent from the outer pipe of a nozzle having a double pipe structure and also extruding a core soln. from the inner pipe of the nozzle at the same time and spinning both of them by a dry/wet system to produce a hollow fiber membrane, as the core soln., a water-soluble org. polymeric compd. liquid at spinning temp. and having an m.p. equal to or higher than the temp. of a coagulation bath, for example, polyethylene glycol with an average mol.wt. of 600-2000 is used. By this constitution, the hollow fiber membrane having a uniform and thin thickness, excellent in inner surface smoothness and easy in the washing of the core soln. can be industrially produced.
Inventors:
Maruo, Susumu
Omichi, Takahiro
Matsuda, Hiroo
Kawaguchi, Takeyuki
Omichi, Takahiro
Matsuda, Hiroo
Kawaguchi, Takeyuki
Application Number:
JP1993000232241
Publication Date:
August 21, 1998
Filing Date:
August 26, 1993
Export Citation:
Assignee:
TEIJIN LTD
International Classes:
B01D69/08; B01D71/14; B01D71/16; D01D5/24; D01F2/28; B01D69/00; B01D71/00; D01D5/00; D01F2/24; (IPC1-7): B01D71/14; B01D69/08; B01D71/16; D01D5/24; D01F2/28
Previous Patent: ACTIVE TYPE OPTICAL FIBER COUPLER AND ITS PRODUCTION
Next Patent: METHOD FOR DETECTING POSITION OF FILM CORRESPONDING TO DIE
Next Patent: METHOD FOR DETECTING POSITION OF FILM CORRESPONDING TO DIE