Patent ID: 6388000
Filing Date: 2002-05-14
Classification: A61L,C08F

Abstract:
A method for the production of an absorbent resin having a cross-linked structure which comprises preparing a mixture solution of a water-soluble unsaturated monomer or monomer mixture containing 50 mol % or greater of acrylic acid which has been partially neutralized or completely neutralized in an amount of 30 to 100 mol % to form alkali metal and/or ammonium salts, 1 to 1,000 ppm of &bgr;-hydroxy propionic acid or a salt thereof and a first cross-linking agent, polymerizing the mixture solutions drying the gel polymer thus obtained by heating at a temperature of not less than 130Â° C., and optionally pulverizing and/or granulating to obtain powdered absorbent resin.