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:
Apr. 27, 1982
Filed:
Aug. 04, 1980
Applicant:
Inventors:
Hiroshi Kawahara, Yokohama, JP;
Tetsuro Yasuda, Yokohama, JP;
Assignee:
Asahi Glass Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
2105002 ; 427245 ;
Abstract
A permselective membrane is obtained by fabricating and crosslinking a methylolated vinylphenol polymer having repeat units having the formula ##STR1## wherein p, q and r are respectively 1 or 2; x and y are respectively selected so as to give a ratio of methylol groups/hydroxy groups of from 0.01 to 2.0; m and n are respectively integers to provide 1.gtoreq.m/m+n.gtoreq.0.2; and X and Y are selected from the group consisting of --R, --Cl, --Br, --CO.sub.2 R, ##STR2## so as to copolymerize a vinyl monomer CH.sub.2 =CXY with a vinylphenol; and R, R' and R' represent hydrogen atom or a C.sub.1 -C.sub.4 alkyl group.