TITLE: ULTRAPOROUS AND MICROPOROUS MEMBRANES AND METHOD OF MAKING MEMBRANES
European Patent Application EP0589897 A4

ABSTRACT:
Abstract not available for EP0589897
Abstract of corresponding document: US5171445
Ultraporous and microporous polymer membranes cast from metastable
dispersions are significantly improved by limiting the time of
environmental exposure to less than about 0.5, preferably less than
0.25 seconds, between casting about 10 DEG to about 20 DEG C. lower
than the usual prior art values. The resulting membranes have far less
debris entrained in the membrane, far more consistent and uniform pore
sizes, a substantially greater number of skin pores, and greatly
increased flow rates for any given pore diameter.

INVENTORS:
Zepf, Robert F. (US)

APPLICATION NUMBER: EP19920908893
PUBLICATION DATE: 07/06/1994
FILING DATE: 03/13/1992

ASSIGNEE: MEMTEC AMERICA CORP (US)
INTERNATIONAL CLASSES: B01D53/22; B01D67/00; B01D69/02; B01D71/68; C08J9/00; C08J9/28;
(IPC1-7): B01D39/00
EUROPEAN CLASSES: B01D71/68; B01D67/00K14B; B01D67/00K14D; B01D69/02