Title:
PRODUCTION OF POLYSULFONE SEPARATION MEMBRANE
Document Type and Number:
Japanese Patent JP3613973
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To freely set the average pore diameter and the rate of perforation of the surface of a membrane and to obtain a polysulfone separation membrane having excellent fractioning performance by dissolving a polysulfone resin in a polar org. solvent, pouring and stretching the resultant soln. and dipping it in an aq.soln. of a surfactant.
SOLUTION: A homogeneous polysulfone soln. is prepd. by mixing 14 pts.wt. polysulfone with 19 pts.wt. polyethylene glycol having an average mol.wt. of 570-630 and 67 pts.wt N,N-dimethylformamide at 70°C. The polysulfone soln. is cooled to 25°C, poured and stretched on a glass substrate and after being cast in a uniform thickness (200 μm) by using a doctor knife set in a casting thickness 200 μm, immediately dipped in a solidifying agent to produce the objective polysulfone separation membrane as a solidified flat membrane. Pure water or an aq.soln. of sodium dodecylsulfate having 0.5, 1.5 or 3.0 g/l concn. is used as the solidifying soln. The average pore diameter of the surface of the membrane is max. and varies when the concn. of the aq.soln. is 0.5 g/l as shown by the diagram.
Inventors:
Kensuke Watanabe
Application Number:
JP10694498A
Publication Date:
January 26, 2005
Filing Date:
April 02, 1998
Export Citation:
Assignee:
NOK CORPORATION
International Classes:
B01D71/68; B29C41/12; B29K281/00; B29L7/00; (IPC1-7): B01D71/68; B29C41/12
Domestic Patent References:
| JP7313852A | ||||
| JP4349927A | ||||
| JP61028408A |
Attorney, Agent or Firm:
Kazunobu Sera
Mayuko Wakuda
Mayuko Wakuda