Water absorbent resin production method and usage

专利名称：Water absorbent resin production method

and usage thereof

发明人：Kazushi Torii,Taishi Kobayashi申请号：US12530976申请日：20080314公开号：US08044157B2公开日：20111025

专利附图：

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 morefunctional groups each of which allows formation of an ester bond or an amide bond byreacting with a carboxyl group so as to obtain a cross-linked polymer hydrogel; (ii)crushing the cross-linked polymer hydrogel obtained in the step (i); and (iii) dryingcrushed cross-linked polymer hydrogel products obtained in the step (ii), wherein: anamount of the internal cross-linking agent (A) is 0.01 mol % or more and 0.2 mol % orless relative to an amount of the unsaturated monomer containing a carboxyl group, anda molar ratio (B)/(A) of the internal cross-linking agent (A) and the non-polymeric internalcross-linking agent (B) is 0.01 or more and 1.8 or less.

申请人：Kazushi Torii,Taishi Kobayashi

地址：Hyogo JP,Hyogo JP

国籍：JP,JP

代理机构：Roylance, Abrams, Berdo & Goodman, L.L.P.

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