Permselective membrane
AssigneeAsahi Glass Company, Limited
InventorsHiroshi Kawahara, Tetsuro Yasuda
Life of this patent
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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.
Claims10
A permselective membrane which is obtained by fabricating and crosslinking a methylolated vinylphenol polymer having repeat units having the formula ##STR5## 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", ##STR6## so as to copolymerize a vinyl monomer CH.sub.2 .dbd.CXY with a vinylphenol;
- and R, R' and R" represent hydrogen atom or a C.sub.1 -C.sub.4 alkyl group.
Dependencies are inferred from the claim text.