Patent ID: 6534554
Filing Date: 2003-03-18
Classification: B01J

Abstract:
A multicomponent ion exchange resin comprising dry granules, wherein each granule comprises at least one microdomain of at least one basic resin dispersed in a continuous phase of at least one acidic resin, wherein the granules have an absorbance under no load of 25 grams or less of tap water per gram of granules, and, after hydration, have a volume no more than ten times greater than a volume of the granules prior to hydration,wherein the basic resin is selected from the group consisting of a poly(vinylamine), a poly(dialkylaminoalkyl (meth)acrylamide), a polymer prepared from the ester analog of an N-(dialkyamino (meth)acrylamide), a polyethylenimine, a poly(vinylguanidine) a poly(allylguanidine), a poly(allylamine), a poly(dimethyldialkylammonium hydroxide), a guanidine-modified polystyrene, a quaternized polystyrene, a quaternized poly(meth)acrylamide or ester analog thereof, poly(vinyl alcohol-co-vinylamine), and mixtures thereof, and wherein the acidic resin is selected from the group consisting of polyacrylic acid, a hydrolyzed starch-acrylonitrile graft copolymer, a starch-acrylic acid graft copolymer, a saponified vinyl acetate-acrylic ester copolymer, a hydrolyzed acrylonitrile polymer, a hydrolyzed acrylamide copolymer, an ethylene-maleic anhydride copolymer, an isobutylene-maleic anhydride copolymer, a poly(vinylphosphonic acid), a poly(vinylsulfonic acid), a poly(vinylphosphoric acid), a poly(vinylsulfuric acid), a sulfonated polystyrene, a poly(aspartic acid), a poly(lactic acid), and mixtures thereof.