TITLE: Highly anisotropic membranes and process for making same.
European Patent Application EP0042766 A2

ABSTRACT:
There are disclosed highly anisotropic membranes comprising cellulose
nitrate or cellulose nitrate-cellulose acetate mixed ester polymers,
and comprising an integral bilayer of a first layer of cells and a
second layer of cells, the cells of the first layer being at least 3
times larger (preferably 5+/- 1 times larger) than the cells of the
second layer. There is also disclosed a process for making such
membranes by casting from a solution of said polymer in a solvent and a
non-solvent. The membranes have many uses, e.g. in laboratory and
industrial filtration of liquids, bacterial sterilisation etc.

INVENTORS:
Kesting, Robert Emil

APPLICATION NUMBER: EP19810302838
PUBLICATION DATE: 12/30/1981
FILING DATE: 06/24/1981

ASSIGNEE: PUROPORE INC (US)
INTERNATIONAL CLASSES: B01D61/00; A61L2/02; B01D71/20; B05D5/00; (IPC1-7): B01D13/04
EUROPEAN CLASSES: B01D71/20; A61L2/02F; B01D67/00K14B; B01D71/16

FOREIGN REFERENCES:
DE2622814A1
4035459  Process for spinning dry-fiber cellulose acetate hollow fiber
membranes
3789993  CELLULOSIC REVERSE OSMOSIS MEMBRANES HAVING HIGH FLUX AND HIGH
SALT REJECTION
3026571  Method of continuous manufacture of membrane filters
GB1430323A