| abstract |
PROBLEM TO BE SOLVED: To provide a super-absorbent polymer composition having excellent balance of absorbency under pressure, re-absorbability, elastic modulus, dryness, etc., a method for producing the same, and a method using the polymer composition. To provide a highly water-absorbing applied article. SOLUTION: A specific ratio of an aqueous solution of acrylic acid and a polyfunctional monomer having at least two ethylenically unsaturated double bonds is added to a specific ratio of a catalyst composed of a redox catalyst and a pyrolytic free radical initiator. It is added to the aqueous solution at a specific temperature, and in an exothermic reaction under specific temperature conditions, the temperature is raised to a temperature not exceeding 90 ° C under adiabatic conditions to form a polymer gel, and the residual monomer content is reduced to 1000 ppm or less. Maintain the temperature within 10 ° C. of the maximum temperature for a sufficient time, neutralize about 50% or more of the carboxylic acid groups with an aqueous base solution, add a predetermined amount of a post-crosslinking agent capable of forming ions or covalent bonds with the carboxylic acid groups, and add It is dried by heating at a temperature and pulverized to obtain a superabsorbent polymer. |