Patent ID: 7790823
Filing Date: 2010-09-07
Classification: C08F,Y10T

Abstract:
1. A process for preparing a hydrogel-forming polymer capable of absorbing aqueous fluids, comprising a step of surface postcrosslinking a base polymer having a pH of not more than 5.7 with a surface postcrosslinking agent consisting of a di- or polyglycidyl compound, a polyamine, a polyamidoamine, a polyamidoamine reaction product with epichlorohydrin, a polyamide reaction product with epichlorohydrin, or 2-oxazolidinone, wherein said hydrogel-forming polymer is an acrylic acid (co)polymer partially neutralized with an alkali metal, alkaline earth metal, ammonium, or amine salt and having a pH absorbency index pH wherein ΔpH=7−pH of product, AUL