Patent ID: 6569910
Filing Date: 2003-05-27
Classification: B01J,C02F,C08F

Abstract:
An ion exchange resin comprising a dry, granulated polymerization product of (a) an &agr;,&bgr;-unsaturated acid or salt thereof, (b) one or more optional vinyl monomers, (c) a bulk crosslinking agent in an amount of about 0.01 to bout 3 mole %, based on the total number of moles of the &agr;,&bgr;-unsaturated carboxylic acid and optional vinyl monomers, (d) a latent crosslinking agent in an amount of 0.1 to about 6 mole %, based on the total number of moles of the &agr;,&bgr;-unsaturated carboxylic acid and optional vinyl monomers, and (e) a surface crosslinking agent in an amount of 0.1 to about 2% by weight of the granules, 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.