Patent ID: 9701796
Date: 2017-07-11
CPC Classifications: A61L,C08F,C08J

Claim:
1. A method of preparing a superabsorbent polymer, the method comprising the steps of: performing thermal polymerization or photo-polymerization of a monomer composition comprising a water-soluble ethylene-based unsaturated monomer, an internal crosslinking agent, and a polymerization initiator to prepare a hydrogel polymer having a gel strength of 10,000 Pa to 13,000 Pa, wherein the internal crosslinking agent includes polyethyleneglycol diacrylate, and hexanediol diacrylate at a concentration of 4,000 ppm to 7,500 ppm, based on the total weight of the water-soluble ethylene-based unsaturated monomer comprised in the monomer composition; coarsely pulverizing the hydrogel polymer by extruding the hydrogel polymer through an outlet having holes; drying the coarsely pulverized hydrogel polymer; pulverizing the dried polymer; and mixing the pulverized polymer and a surface crosslinking agent to perform a surface crosslinking reaction of the mixture.