SUBMICROSCOPIC PARTICLES OF ANION EXCHANGE RESINM, ANION EXCHANGE PROCESS MAKING THEM, PROCESSES FOR PREPARING THEM AND INTERMEDIATES THEREFOR

摘要

Submicroscopic particles of anion exchange resin comprise approximately spherical beads of crosslinked copolymer having diameters of 0.01 to 1.5 micrometers and bear 0.7 to 1.5 anion exchange functional groups per monomer unit. The particles may be used in the removal of ionic impurities from liquids and may subsequently be separated from the treated liquids by flocculation. The particles may be made by emulsion polymerization followed by coagulation of the emulsion polymer beads, separation of the resulting coagulum particles from the emulsion polymerization medium and functionalization of the beads, which in some cases will remain as coagulum particles and in other cases will redisperse during functionalization. Also of interest are chloromethylated intermediates for the functionalized resin.