| 摘要 |
PROBLEM TO BE SOLVED: To provide a treating method for a hollow thread film for imparting a suitable water-permeability and a controlled fraction molecular weight to a polysulfone based hollow thread film. SOLUTION: The polysulfone based hollow thread film being subjected to a dry/wet spinning is immersed in a glycol represented by the formula: HO(CH2 ) nOH (wherein (n) is 2, 3 or 4) and is subjected to an immersion treatment at a temperature of 100 to 150 deg.C. The polysulfone based hollow thread film subjected to the immersion treatment by this method can stably impart an effective hollow thread film as a hydrophilic ultrafiltration membrane.
|
