Patent ID: 6649663
Filing Date: 2003-11-18
Classification: B01J,C02F,C08F

Abstract:
A process for preparing monodisperse ion exchangers having chelating functional groups comprising(a) reacting monomer droplets made from at least one monovinylaromatic compound and at least one polyvinylaromatic compound to give a monodisperse, crosslinked bead polymer, (b) amidomethylating the monodisperse, crosslinked bead polymer from step (a) with phthalimide or methylphthalimide, (c) converting the amidomethylated bead polymer from step (b) to an aminomethylated bead polymer, and (d) converting the aminomethylated bead polymer from step (c) to ion exchangers having chelating groups of the formula whereinR1 is hydrogen or a radical CH2â€”COOH or CH2 P(O)(OH)2, R2 is a radical CH2COOH or CH2P(O)(OH)2, and n is an integer from 1 to 4.