Amphoteric ion exchange resins

Details Amphoteric ion exchange resins Amphoteric ion exchange resins

C - Chemistry, Metallurgy

08

J

403/4

C08J 5/20 (2006.01) B01J 43/00 (2006.01) C08F 8/00 (2006.01) C08F 265/00 (2006.01) C08F 267/00 (2006.01) C08F 271/00 (2006.01) C08J 9/04 (2006.01) C08J 9/28 (2006.01) C08L 57/00 (2006.01)

Patent

CA 1090045

ABSTRACT A process for making a thermally reversible amphoteric ion exchange resin suitable for use in the demineralization of water which process comprises dis- persing particles of an ion exchange resin comprising either weakly basic or weakly acidic ionogenic groups in a solution comprising one or more monomers containing an ionogenic group, or organic precursor thereof, of opposite acid-base character to the ionogenic groups of the ion exchange resin particles, a crosslinking agent comprising two or more vinylic or allylic groups, and a porogen; secondly polymerizing the monomer to give a macroporous crosslinked polymer matrix; and thirdly treating the polymeric composition to convert any organic precursors to ionogenic groups to form an amphoteric ion exchange resin.

256215

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