| abstract |
(57) [Summary] [Structure] A crosslinkable anion exchanger having the following general formula (I): (In the general formula (I), A is a direct bond or a linear or branched alkylene group having 1 to 4 carbon atoms, B is a linear, branched or cyclic alkylene group having 1 to 8 carbon atoms, R 1 , R 2 , R 3 represents an alkyl group having 1 to 4 carbon atoms which may be the same or different, or an alkanol group, X represents a counter ion coordinated to an ammonium group, and benzene ring D is It may be substituted with an alkyl group or a halogen atom. ) A silica-removing resin containing a structural unit represented by the formula (4) and a structural unit derived from an unsaturated hydrocarbon group-containing crosslinkable monomer. [Effect] Silica in water can be efficiently removed over a wide range of temperatures. |