发明名称 |
WATER ABSORBENT RESIN PRODUCTION METHOD, WATER ABSORBENT RESIN, AND USAGE THEREOF |
摘要 |
A method for producing a water absorbent resin comprises the steps of: (i) polymerizing a monomer including an unsaturated monomer containing a carboxyl group, in the presence of an internal cross-linking agent (A) having two or more radical polymerizable unsaturated groups in its single molecule and in the presence of a non-polymeric internal cross-linking agent (B) having in its single molecule two or more functional groups each of which allows formation of an ester bond or an amide bond by reacting with a carboxyl group, while crushing a cross-linked polymer hydrogel; and (ii) drying the cross-linked polymer hydrogel obtained in the step (i), wherein: an amount of the internal cross-linking agent (A) is 0.01 mol % or more and 0.2 mol % or less relative to an amount of the unsaturated monomer containing a carboxyl group, and a molar ratio (B)/(A) of the internal cross-linking agent (A) and the non-polymeric internal cross-linking agent (B) is 0.01 or more and 1.8 or less. |
申请公布号 |
EP2125917(A1) |
申请公布日期 |
2009.12.02 |
申请号 |
EP20080722551 |
申请日期 |
2008.03.14 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
TORII, KAZUSHI;KOBAYASHI, TAISHI |
分类号 |
C08F220/06;C08J3/24;C08L33/02 |
主分类号 |
C08F220/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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