Patent ID: 9701763
Date: 2017-07-11
CPC Classifications: C08F,C08J,C08L

Claim:
1. A method for preparing super absorbent polymer comprising the steps of: performing photopolymerization of a monomer composition comprising water soluble ethylene unsaturated monomers, a thermal polymerization initiator and a photopolymerization initiator at a temperature of 30 to 55° C.; performing a thermal polymerization and a photopolymerization at a temperature of 55 to 120° C. to form a hydrogel polymer; and drying the hydrogel polymer, wherein the temperature of the monomer composition reaches 55° C. or more in the step of performing photopolymerization of the monomer composition, and the thermal polymerization is progressed at the temperature of 55° C. or more.