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1.发明公开
公开(公告)号：EP2995639A4
公开(公告)日：2016-12-07
申请号：EP14795139
申请日：2014-05-09
发明人： IMURA MOTOHIRO , WADA HIDENORI , KATO SEIJI
CPC分类号： C08J3/245 , A61L15/24 , C08J2333/02 , C08J2333/08 , C08L33/08
摘要： The present invention has an object to provide a method for inexpensively and stably producing, with high productivity, water absorbent resin having excellent damage resistance, and is a method for producing a polyacrylic acid (salt)-based water absorbent resin, the method comprising a surface-crosslinking step, the surface-crosslinking step including a reaction step, the reaction step involving using a reactor having (i) an inner wall surface having a temperature within a range of 100°C to 250°C and (ii) an inside atmosphere having a dew point within a range of 60°C to 100°C, the reaction step including heat-treating a water absorbent resin mixture so as to produce water absorbent resin powder having a temperature within a range of 90°C to 130°C.
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公开(公告)号：EP2527390A4
公开(公告)日：2015-01-07
申请号：EP11734735
申请日：2011-01-20
发明人： TAKAAI TOSHIHIRO , FUJINO SHINICHI , WADA HIDENORI
CPC分类号： C08F6/008 , A61L15/60 , B01J20/267 , B01J2220/68 , C08J3/075 , C08J3/12 , C08J3/122 , C08J2300/14
摘要： With regard to a method for producing a water absorbent resin by drying a particulate hydrogel crosslinked polymer having a high solid content concentration (of 45% by weight or more, further 50% by weight or more, and particularly 55% by weight or more), to provide a method for efficient drying of a water absorbent resin having maintained/improved physical properties. A production method in which a through-circulation belt type dryer or a through-circulation stationary batch type dryer is used in the drying step and the drop and scatter ratio of a particulate hydrogel crosslinked polymer is set to 1% by weight or less.
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公开(公告)号：EP2527391A4
公开(公告)日：2014-10-01
申请号：EP11734736
申请日：2011-01-20
发明人： TAKAAI TOSHIHIRO , FUJINO SHINICHI , WADA HIDENORI
CPC分类号： C08F6/008 , A61L15/60 , B01J20/267 , B01J20/28004 , B01J20/28047 , B01J2220/68 , C08F6/006 , C08F20/04 , C08F20/06 , C08J3/12 , C08J3/245 , C08J9/28 , C08J2300/14 , C08J2333/02 , C08L33/02
摘要： In a method for producing a water absorbent resin by drying a particulate hydrogel having a high solid content concentration (of 45% by weight or more, preferably 50% by weight or more, and more preferably 55% by weight or more), a method for efficient drying water absorbent resin having maintained/improved physical properties is provided. Disclosed is a method for producing a water absorbent resin, comprising: a polymerization step to polymerize an unsaturated monomer, and; a drying step to dry a particulate hydrogel crosslinked polymer, which is obtained by micronization of a hydrogel polymer during or after the polymerization and which has a solid content concentration of 45% by weight or more, wherein, an amount of a peroxide in the particulate hydrogel crosslinked polymer to be dried in the drying step is 1 to 100 ppm relative to the weight of the solid content of the particulate hydrogel crosslinked polymer, and a drying temperature of the particulate hydrogel crosslinked polymer in the drying step is 160°C or more.
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4.发明公开
公开(公告)号：EP2589613A4
公开(公告)日：2014-06-25
申请号：EP11800917
申请日：2011-06-29
发明人： TAKAAI TOSHIHIRO , WADA HIDENORI , FUJINO SHINICHI
IPC分类号： C08F20/06 , A61L15/60 , C08F220/06 , C08J3/12 , C08J9/12
CPC分类号： C08J9/122 , A61L15/24 , A61L15/60 , C08F2/01 , C08F20/00 , C08F220/06 , C08J3/245 , C08J9/20 , C08J9/36 , C08J2203/06 , C08J2205/05 , C08J2333/02 , C08J2335/02 , Y10T428/2982 , C08L33/02 , C08F2222/1013
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5.发明公开
公开(公告)号：EP2927266A4
公开(公告)日：2016-07-27
申请号：EP13860396
申请日：2013-12-03
发明人： WADA HIDENORI , IMURA MOTOHIRO , WADA KATSUYUKI , KATO SEIJI
摘要： As a method for producing a polyacrylic acid (salt)-based water absorbent resin particle which less generates fine powder and has an excellent impact resistance and a high moisture content even in a case where the polyacrylic acid (salt)-based water absorbent resin particle is produced on a large scale, employed is a production method including the steps of: (a) adding a surface crosslinking agent solution to water absorbent resin powder to obtain a mixture; (b) reacting the mixture; and, thereafter (c) adding an aqueous liquid to at least one selected from the group consisting of (i) the water absorbent resin powder during the step (b) and (ii) the water absorbent resin powder after the step (b), an atmospheric dew point being not lower than 20°C in the step (c), and a temperature of the water absorbent resin powder being higher than the atmospheric dew point in the step (c).
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