(19)
(11)EP 0 228 072 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
05.07.1989 Bulletin 1989/27

(43)Date of publication A2:
08.07.1987 Bulletin 1987/28

(21)Application number: 86117950.5

(22)Date of filing:  23.12.1986
(51)International Patent Classification (IPC)4B01D 61/14, B01D 71/68, B01D 71/64, C08J 3/11, C08L 81/06, C08L 79/08
(84)Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30)Priority: 23.12.1985 US 812260
23.12.1985 US 812343
15.08.1986 US 897045

(71)Applicant: GELMAN SCIENCES, INC.
Ann Arbor, Michigan 48106 (US)

(72)Inventors:
  • Kraus, Menahem A.
    Ann Arbor Michigan 48105 (US)
  • Heisler, Mark D.
    Saline Michigan 48176 (US)
  • Katsnelson, Inessa (NMI)
    An Arbor Michigan 48104 (US)
  • Velazquez, Diosie J.
    Saline Michigan 48176 (US)

(74)Representative: Patentanwälte Lippert, Stachow, Schmidt & Partner 
Postfach 30 02 08
51412 Bergisch Gladbach
51412 Bergisch Gladbach (DE)


(56)References cited: : 
  
      


    (54)Filtration membrane and method of making the same


    (57) Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.





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