The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 1998
Filed:
May. 29, 1996
Applicant:
Inventors:
Jae Min Hong, Seoul, KR;
Seong Ryong Ha, Seoul, KR;
Hyun Chae Park, Seoul, KR;
Yong Soo Kang, Seoul, KR;
Kyu Hong Ahn, Seoul, KR;
Assignee:
Korea Institute of Science and Technology, Seoul, KR;
Primary Examiner:
Int. Cl.
CPC ...
C08J / ; B01D / ; B29C / ;
U.S. Cl.
CPC ...
521 64 ; 21050029 ; 21050035 ; 21050038 ; 21050039 ; 2105004 ; 21050041 ; 21050042 ; 21050043 ; 264 41 ; 264 50 ; 264 83 ; 264212 ; 264310 ; 521 88 ; 521 89 ; 521142 ; 521145 ; 521146 ; 521147 ; 521149 ; 521180 ; 521189 ;
Abstract
The present invention describes a method for preparing an asymmetric porous membrane by a dry-wet phase inversion method, which comprises contacting a cast or spun polymer solution with water or organic vapor prior to immersing into the non-solvent precipitation medium, whereby said water or organic vapor is adsorbed onto the cast or spun polymer solution. Higher permeability and excellent rejection ability can be obtained, due to the high porosity and uniform pore size of said membranes according to the present invention.