A method for preparing an ion-exchange resin in the form of large spheroidal beads from seed beads.

摘要

Ion-exchange resins in the form of large, spheroidal beads having improved integrity and increased resistance to osmotic shock are prepared from a seed bead of a cross-linked addition copolymer having a monomer mixture of a mono- and polyethylenically unsaturated monomer imbibed and subsequently polymerized therein. For example, the spheroidal beads prepared by the imbibition and subsequent copolymerization of styrene and divinylbenzene within a seed bead of a copolymer of the same monometric components can be aminated to form anion-exchange beads having a particle diameter of at least 1.0mm which exhibit reduced breakage and/or increased osmotic shock resistance.