Water-absorbent resin and method of producing water-absorbent resin
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United States of America Patent
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Oct 5, 2021
Grant Date -
Jun 25, 2020
app pub date -
Feb 28, 2020
filing date -
Jul 11, 2014
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Abstract
Provided is a method of producing a water-absorbent resin comprising a step of polymerizing a water-soluble ethylenically unsaturated monomer in the presence of an internal-crosslinking agent, and a step of performing post-crosslinking, wherein:
- the step of polymerizing comprises one or more polymerization steps;all the polymerization steps are performed in the presence of both one or more azo based compounds and peroxides so that the both are coexistent in the all steps;in each polymerization step, a proportion of the azo compounds is 40-95 mass % relative to an amount of the azo compounds and the peroxides;the water-absorbent resin has a water-absorption capacity of physiological saline under a load of 4.14 kPa at 120 minutes passed from the start of water absorption of 20 ml/g or more; andthe degree of swelling under a load at 30 minutes is 70%.
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