TITLE: ANISOTROPIC MEMBRANES
European Patent EP0036315
 B1

ABSTRACT:
Abstract of EP0036315
There is disclosed, in one aspect, an improved highly anisotropic
membrane comprising a skin and a porous asymmetric support. The skin
contains pores which have an average pore diameter from about 0.005 to
about 3.0 microns and this asymmetric support comprises a reticulated
structure which contains pores which have pore sizes ranging from about
10 to about 20,000 times as large as the average pore diameter of the
pores of the skin. The membrane has a bulk porosity greater than about
70%. In another aspect, there is disclosed a process for preparing
these membranes. This process comprises casting a polymer dope while
the dope is in a metastable liquid dispersion condition. The
concentration of polymer in the polymer dope should be high enough to
produce a coherent membrane yet low enough to form a substantially
all-reticulated structure within the asymmetric support. The membranes
are characterized by high flow rates, excellent retention properties
and improved resistance to fouling.

INVENTORS:
Wrasidlo, Wolfgang J.

APPLICATION NUMBER: EP19810301074
PUBLICATION DATE: 01/22/1986
FILING DATE: 03/13/1981

ASSIGNEE: BRUNSWICK CORPORATION
INTERNATIONAL CLASSES: B32B5/32; B01D39/16; B01D65/10; B01D67/00; B01D69/02; B01D69/06;
B01D69/10; B01D71/28; B01D71/34; B01D71/42; B01D71/56; B01D71/68;
B32B5/14; B32B27/30; B32B27/36; C08J9/28; (IPC1-7): B01D13/04
EUROPEAN CLASSES: B01D67/00K14B; B01D31/00; B01D65/10; B01D69/02