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1. 发明授权

US09334376B2 Water-absorbable polyacrylic acid resin powder, and process for production thereof 有权
标题翻译：吸水性聚丙烯酸树脂粉末及其制造方法
公开(公告)号：US09334376B2
公开(公告)日：2016-05-10
申请号：US13518438
申请日：2010-12-23
申请人： Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
发明人： Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
IPC分类号： B01J20/26 , C08J3/12 , C08F220/06 , A61L15/48 , A61L15/60 , C08F20/06
CPC分类号： C08J3/12 , A61L15/48 , A61L15/60 , C08F20/06 , C08F220/06 , C08J2333/08 , C08J2333/10 , C08L33/02
摘要： A process according to the present invention for production of water-absorbable polyacrylic acid resin powder, including: (a) polymerizing an acrylic acid-based monomer aqueous solution containing bubbles, and (b) drying a hydrogel crosslinked polymer thus obtained in the step of polymerizing, further includes (c) lowering solubility of dissolved gas in a monomer aqueous solution in the presence of a surfactant and/or a dispersing agent, so as to generate the bubbles in the acrylic acid-based monomer aqueous solution. With this arrangement, it is possible to provide white water-absorbable resin with better water absorbing rate, keeping or without significantly losing the other properties (permeability potential, bulk specific gravity, surface tension, absorbency against pressure, impact resistance, etc.)
摘要翻译：根据本发明的用于制造吸水性聚丙烯酸树脂粉末的方法，包括：（a）使含有气泡的丙烯酸类单体水溶液聚合，和（b）将由此得到的水凝胶交联聚合物干燥，聚合，还包括（c）在表面活性剂和/或分散剂存在下降低溶解气体在单体水溶液中的溶解度，以便在丙烯酸类单体水溶液中产生气泡。通过这种布置，可以提供具有更好吸水率的白色吸水性树脂，保持或不显着损失其它性能（渗透性潜力，体积比重，表面张力，抗压力，耐冲击性等）

2. 发明申请

US20120258851A1 WATER-ABSORBABLE POLYACRYLIC ACID RESIN POWDER, AND PROCESS FOR PRODUCTION THEREOF 有权
标题翻译：水可吸收聚丙烯酸树脂粉及其生产方法
公开(公告)号：US20120258851A1
公开(公告)日：2012-10-11
申请号：US13518438
申请日：2010-12-23
申请人： Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
发明人： Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
IPC分类号： B01J20/26 , B01J20/32 , B01J20/30
CPC分类号： C08J3/12 , A61L15/48 , A61L15/60 , C08F20/06 , C08F220/06 , C08J2333/08 , C08J2333/10 , C08L33/02
摘要： A process according to the present invention for production of water-absorbable polyacrylic acid resin powder, including: (a) polymerizing an acrylic acid-based monomer aqueous solution containing bubbles, and (b) drying a hydrogel crosslinked polymer thus obtained in the step of polymerizing, further includes (c) lowering solubility of dissolved gas in a monomer aqueous solution in the presence of a surfactant and/or a dispersing agent, so as to generate the bubbles in the acrylic acid-based monomer aqueous solution. With this arrangement, it is possible to provide white water-absorbable resin with better water absorbing rate, keeping or without significantly losing the other properties (permeability potential, bulk specific gravity, surface tension, absorbency against pressure, impact resistance, etc.)
摘要翻译：根据本发明的用于制造吸水性聚丙烯酸树脂粉末的方法，包括：（a）使含有气泡的丙烯酸类单体水溶液聚合，和（b）将由此得到的水凝胶交联聚合物干燥，聚合，还包括（c）在表面活性剂和/或分散剂存在下降低溶解气体在单体水溶液中的溶解度，以便在丙烯酸类单体水溶液中产生气泡。通过这种布置，可以提供具有更好吸水率的白色吸水性树脂，保持或不显着损失其它性能（渗透性潜力，体积比重，表面张力，抗压力，耐冲击性等）

3. 发明授权

US09447203B2 Method for producing water absorbent polyacrylic acid (salt) resin powder, and water absorbent polyacrylic acid (salt) resin powder 有权
标题翻译：吸水性聚丙烯酸（盐）树脂粉末和吸水性聚丙烯酸（盐）树脂粉末的制造方法
公开(公告)号：US09447203B2
公开(公告)日：2016-09-20
申请号：US13639082
申请日：2011-04-07
申请人： Sayaka Machida , Kazushi Torii , Yoko Shirai , Hiroyuki Ikeuchi , Shigeru Sakamoto , Koji Tachi , Reiko Nakatsuru
发明人： Sayaka Machida , Kazushi Torii , Yoko Shirai , Hiroyuki Ikeuchi , Shigeru Sakamoto , Koji Tachi , Reiko Nakatsuru
IPC分类号： B01J20/26 , C08F6/00 , C08F220/06 , C08J3/24 , B29B9/06 , B29C47/00 , B29C47/38 , C08F222/10 , B29C47/30 , B29C47/66 , B29C47/92 , B29B9/16
CPC分类号： B01J20/267 , B01J20/28004 , B01J20/28016 , B01J20/3007 , B01J20/3021 , B01J20/3078 , B01J20/3085 , B29B9/06 , B29B2009/161 , B29C47/0011 , B29C47/30 , B29C47/385 , B29C47/667 , B29C47/92 , B29C2947/9259 , B29C2947/92704 , C08F6/008 , C08F220/06 , C08F220/20 , C08F222/1006 , C08J3/245 , C08J2333/02 , Y10T428/2982 , C08L33/02
摘要： An object of the present invention is to provide a method for producing water absorbent resin powder in which permeability potential (SFC) is improved while a water absorbing rate (FSR) is being kept. The method is a method for producing water absorbent polyacrylic acid (salt) resin powder including the steps of: (i) polymerizing an acrylic acid (salt) monomer aqueous solution; (ii) during or after the step of (i), performing gel grinding of a hydrogel crosslinked polymer obtained by the polymerization, wherein the hydrogel crosslinked polymer has resin solid content of 10 wt % to 80 wt %, and the gel grinding is carried out with gel grinding energy (GGE) of 18 [J/g] to 60 [J/g]; (iii) drying a particulate hydrogel crosslinked polymer obtained by the gel grinding, wherein the drying is performed at 150° C. to 250° C.; and (iv) carrying out a surface treatment to the particulate hydrogel crosslinked polymer thus dried.
摘要翻译：本发明的目的是提供一种吸水性树脂粉末的制造方法，其中在保持吸水率（FSR）的同时提高渗透率（SFC）。该方法是生产吸水性聚丙烯酸（盐）树脂粉末的方法，包括以下步骤：（i）使丙烯酸（盐）单体水溶液聚合; （ii）在（i）的步骤期间或之后，进行通过聚合获得的水凝胶交联聚合物的凝胶研磨，其中所述水凝胶交联聚合物的树脂固含量为10重量％至80重量％，并且进行凝胶研磨（GGE）为18 [J / g]至60 [J / g]; （iii）干燥通过凝胶研磨获得的颗粒状水凝胶交联聚合物，其中干燥在150℃至250℃下进行; 和（iv）对由此干燥的颗粒状水凝胶交联聚合物进行表面处理。

4. 发明申请

US20130102750A1 METHOD FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER ABSORBENT RESIN POWDER 有权
标题翻译：生产聚丙烯酸（盐） - 水吸收树脂粉末的方法
公开(公告)号：US20130102750A1
公开(公告)日：2013-04-25
申请号：US13643682
申请日：2011-04-27
申请人： Yusuke Watanabe , Kazushi Torii , Kozo Nogi , Kunihiko Ishizaki , Reiko Nakatsuru , Shigeru Sakamoto
发明人： Yusuke Watanabe , Kazushi Torii , Kozo Nogi , Kunihiko Ishizaki , Reiko Nakatsuru , Shigeru Sakamoto
IPC分类号： C08J3/12 , C08F122/10
CPC分类号： C08J3/12 , C08F6/008 , C08F122/105 , C08F220/06 , C08J3/122 , C08J3/245 , C08J2333/02 , C08L33/02
摘要： A water absorbent resin having less fine powder or powdery dust and a controlled particle size is provided, and the water absorption rate of the water absorbent resin is increased by a simple method at low cost, while maintaining or improving other physical properties such as liquid permeability. Disclosed is a method for producing a polyacrylic acid (salt)-type water absorbent resin powder, which includes, in sequence, a step of polymerizing an aqueous solution of acrylic acid (salt)-type monomer; a step of gel-crushing a gel of a water-containing gel-like crosslinked polymer during polymerization or after polymerization; a step of drying the water-containing gel-like crosslinked polymer; and a step of pulverizing and classifying the dried polymer, wherein water absorbent resin fine particles having a particle size of less than 150 μm or a hydrated-particles thereof is added to a step prior to the drying step, and in the drying step, hot air drying is carried out with a hot air having an average flow velocity of 1.0 to 3.0 [m/s], a dew point of 30° C. to 100° C., and a hot air temperature of 140° C. to 235° C.
摘要翻译：提供具有较少粉末或粉末粉尘和受控粒度的吸水性树脂，并且通过简单的方法以低成本提高吸水性树脂的吸水率，同时保持或改善其它物理性质如液体渗透性。公开了一种聚丙烯酸（盐）型吸水性树脂粉末的制造方法，其中，依次包括使丙烯酸（盐）型单体的水溶液聚合的工序; 在聚合过程中或聚合后凝胶化凝胶状凝胶状交联聚合物凝胶的步骤; 干燥含水凝胶状交联聚合物的工序; 以及将干燥聚合物粉碎分级的步骤，其中将粒径小于150μm的吸水性树脂细颗粒或其水合物颗粒加入到干燥步骤之前的步骤中，并且在干燥步骤中，热使用平均流速为1.0〜3.0 [m / s]，露点为30℃〜100℃，热风温度为140℃〜235℃的热风进行空气干燥 C。

5. 发明授权

US08765906B2 Method for producing polyacrylic acid (salt) type water absorbent resin powder 有权
标题翻译：聚丙烯酸（盐）型吸水性树脂粉末的制造方法
公开(公告)号：US08765906B2
公开(公告)日：2014-07-01
申请号：US13643682
申请日：2011-04-27
申请人： Yusuke Watanabe , Kazushi Torii , Kozo Nogi , Kunihiko Ishizaki , Reiko Nakatsuru , Shigeru Sakamoto
发明人： Yusuke Watanabe , Kazushi Torii , Kozo Nogi , Kunihiko Ishizaki , Reiko Nakatsuru , Shigeru Sakamoto
IPC分类号： C08G63/02 , C08G63/00
CPC分类号： C08J3/12 , C08F6/008 , C08F122/105 , C08F220/06 , C08J3/122 , C08J3/245 , C08J2333/02 , C08L33/02
摘要： A water absorbent resin having less fine powder or powdery dust and a controlled particle size is provided, and the water absorption rate of the water absorbent resin is increased by a simple method at low cost, while maintaining or improving other physical properties such as liquid permeability. Disclosed is a method for producing a polyacrylic acid (salt)-type water absorbent resin powder, which includes, in sequence, a step of polymerizing an aqueous solution of acrylic acid (salt)-type monomer; a step of gel-crushing a gel of a water-containing gel-like crosslinked polymer during polymerization or after polymerization; a step of drying the water-containing gel-like crosslinked polymer; and a step of pulverizing and classifying the dried polymer, wherein water absorbent resin fine particles having a particle size of less than 150 μm or a hydrated-particles thereof is added to a step prior to the drying step, and in the drying step, hot air drying is carried out with a hot air having an average flow velocity of 1.0 to 3.0 [m/s], a dew point of 30° C. to 100° C., and a hot air temperature of 140° C. to 235° C.
摘要翻译：提供具有较少粉末或粉末粉尘和受控粒度的吸水性树脂，并且通过简单的方法以低成本提高吸水性树脂的吸水率，同时保持或改善其它物理性质如液体渗透性。公开了一种聚丙烯酸（盐）型吸水性树脂粉末的制造方法，其中，依次包括使丙烯酸（盐）型单体的水溶液聚合的工序; 在聚合过程中或聚合后凝胶化凝胶状凝胶状交联聚合物凝胶的步骤; 干燥含水凝胶状交联聚合物的工序; 将干燥聚合物粉碎并分级的步骤，其中在干燥步骤之前的步骤中加入粒径小于150μm的吸水性树脂微粒或其水合颗粒，并且在干燥步骤中，热使用平均流速为1.0〜3.0 [m / s]，露点为30℃〜100℃，热风温度为140℃〜235℃的热风进行空气干燥 C。

6. 发明申请

US20130026412A1 METHOD FOR PRODUCING WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER, AND WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER 有权
标题翻译：生产水吸收聚丙烯酸（盐）树脂粉的方法和水吸收聚丙烯酸（盐）树脂粉
公开(公告)号：US20130026412A1
公开(公告)日：2013-01-31
申请号：US13639082
申请日：2011-04-07
申请人： Sayaka Machida , Kazushi Torii , Yoko Shirai , Hiroyuki Ikeuchi , Shigeru Sakamoto , Koji Tachi , Reiko Nakatsuru
发明人： Sayaka Machida , Kazushi Torii , Yoko Shirai , Hiroyuki Ikeuchi , Shigeru Sakamoto , Koji Tachi , Reiko Nakatsuru
IPC分类号： B01J20/26 , C08F222/20
CPC分类号： B01J20/267 , B01J20/28004 , B01J20/28016 , B01J20/3007 , B01J20/3021 , B01J20/3078 , B01J20/3085 , B29B9/06 , B29B2009/161 , B29C47/0011 , B29C47/30 , B29C47/385 , B29C47/667 , B29C47/92 , B29C2947/9259 , B29C2947/92704 , C08F6/008 , C08F220/06 , C08F220/20 , C08F222/1006 , C08J3/245 , C08J2333/02 , Y10T428/2982 , C08L33/02
摘要： An object of the present invention is to provide a method for producing water absorbent resin powder in which permeability potential (SFC) is improved while a water absorbing rate (FSR) is being kept. The method is a method for producing water absorbent polyacrylic acid (salt) resin powder including the steps of: (i) polymerizing an acrylic acid (salt) monomer aqueous solution; (ii) during or after the step of (i), performing gel grinding of a hydrogel crosslinked polymer obtained by the polymerization, wherein the hydrogel crosslinked polymer has resin solid content of 10 wt % to 80 wt %, and the gel grinding is carried out with gel grinding energy (GGE) of 18 [J/g] to 60 [J/g]; (iii) drying a particulate hydrogel crosslinked polymer obtained by the gel grinding, wherein the drying is performed at 150° C. to 250° C.; and (iv) carrying out a surface treatment to the particulate hydrogel crosslinked polymer thus dried.
摘要翻译：本发明的目的是提供一种吸水性树脂粉末的制造方法，其中在保持吸水率（FSR）的同时提高渗透率（SFC）。该方法是生产吸水性聚丙烯酸（盐）树脂粉末的方法，包括以下步骤：（i）使丙烯酸（盐）单体水溶液聚合; （ii）在（i）的步骤期间或之后，进行通过聚合获得的水凝胶交联聚合物的凝胶研磨，其中所述水凝胶交联聚合物的树脂固含量为10重量％至80重量％，并且进行凝胶研磨（GGE）为18 [J / g]至60 [J / g]; （iii）干燥通过凝胶研磨获得的颗粒状水凝胶交联聚合物，其中干燥在150℃至250℃下进行; 和（iv）对由此干燥的颗粒状水凝胶交联聚合物进行表面处理。

7. 发明申请

US20070207924A1 Aqueous-Liquid-Absorbing Agent and its Production Process 有权
标题翻译：水性吸液剂及其制备方法
公开(公告)号：US20070207924A1
公开(公告)日：2007-09-06
申请号：US10593706
申请日：2005-03-11
申请人： Hiroyuki Ikeuchi , Kazushi Torii , Shigeru Sakamoto , Taku Iwamura , Sayaka Machida
发明人： Hiroyuki Ikeuchi , Kazushi Torii , Shigeru Sakamoto , Taku Iwamura , Sayaka Machida
IPC分类号： B01J20/26
CPC分类号： C08J3/245
摘要： An object of the present invention is to provide an aqueous-liquid-absorbing agent which comprises water-absorbent resin particles as essential components and is suitable for uses in sanitary materials. As a means of achieving this object, an aqueous-liquid-absorbing agent according to the present invention is an aqueous-liquid-absorbing agent comprising water-absorbent resin particles as essential components, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer and have a crosslinked structure in their inside; with the aqueous-liquid-absorbing agent exhibiting an absorption rate (FSR) of not less than 0.2 g/g/s, a water absorption capacity (CRC) of 5 to 25 g/g, a saline flow conductivity (SFC) of not less than 400×10−7 cm3·s/g, and a wet porosity of not less than 20%. A process according to the present invention for obtaining such an aqueous-liquid-absorbing agent is characterized by comprising the steps of: obtaining a hydrogel from an aqueous monomer solution including a water-soluble ethylenically unsaturated monomer and an internal-crosslinking agent of not less than 0.2 mol % in ratio to the monomer; and then extruding this hydrogel from a perforated structure having perforation diameters in the range of 0.3 to 6.4 mm to thereby pulverize the hydrogel.
摘要翻译：本发明的目的是提供一种含水吸收剂，其包含作为必需成分的吸水性树脂粒子，适用于卫生材料。作为实现该目的的手段，本发明的水性液体吸收剂是以吸水性树脂粒子为必须成分的水性液体吸收剂，其中吸水性树脂粒子是通过包括聚合水溶性烯键式不饱和单体并在其内部具有交联结构的步骤; 吸水率（FSR）为0.2g / g / s以上，吸水容量（CRC）为5〜25g / g，盐水流动电导率（SFC）不为小于400×10 -3 cm 3 / g，湿气孔率不小于20％。根据本发明的用于获得这种水性液体吸收剂的方法的特征在于包括以下步骤：从包含水溶性烯键式不饱和单体和不少于少量的内部交联剂的单体水溶液获得水凝胶与单体的比例为0.2摩尔％以上; 然后从穿孔直径在0.3至6.4mm范围内的穿孔结构体挤出该水凝胶，从而粉碎水凝胶。

8. 发明申请

US20060073969A1 Vater-absorbent resin composition and its production process 有权
标题翻译：吸水树脂组合物及其制备方法
公开(公告)号：US20060073969A1
公开(公告)日：2006-04-06
申请号：US10544348
申请日：2004-02-06
申请人： Kazushi Torii , Yoshiro Mitsukami , Motohiro Imura , Taku Iwamura , Toshimasa Kitayama , Kenji Kadonaga , Hiroki Inoue , Koji Miyake , Kozo Nogi , Masatoshi Nakamura , Shigeru Sakamoto
发明人： Kazushi Torii , Yoshiro Mitsukami , Motohiro Imura , Taku Iwamura , Toshimasa Kitayama , Kenji Kadonaga , Hiroki Inoue , Koji Miyake , Kozo Nogi , Masatoshi Nakamura , Shigeru Sakamoto
IPC分类号： B01J20/00
CPC分类号： A61L15/60
摘要： There are disclosed a water-absorbent resin composition and its production process, wherein the water-absorbent resin composition causes little gel-blocking and is excellent in the liquid permeability and liquid diffusibility and is high also in the absorption performances and further is strong also against the physical damage; and there are further disclosed a water-absorbent resin composition and its production process, wherein the water-absorbent resin composition has the following further advantages, in addition to the above, of involving little segregation of the metal compound and further having a dust prevention effect. One of water-absorbent resin compositions according to the present invention is a water-absorbent resin composition comprising water-absorbent resin particles obtained by polymerizing a monomer including acrylic acid and/or its salt, with the composition having a mass-average particle diameter of 100 to 600 μm and comprising water-soluble polyvalent metal salt particles and the water-absorbent resin particles that have been surface-crosslinked.
摘要翻译：公开了吸水性树脂组合物及其制造方法，其中吸水性树脂组合物几乎没有凝胶阻塞，并且液体渗透性和液体扩散性优异，并且吸收性能也高，并且还强物理伤害; 并且还公开了一种吸水性树脂组合物及其制造方法，其中除了上述之外，吸水性树脂组合物具有以下进一步的优点，即涉及金属化合物几乎不偏析并且还具有防尘效果。根据本发明的吸水性树脂组合物之一是吸收性树脂组合物，其包含通过使包含丙烯酸和/或其盐的单体聚合而获得的吸水性树脂颗粒，其组成物的质量平均粒径为 100〜600μm，含有水溶性多价金属盐粒子和表面交联的吸水性树脂粒子。

9. 发明授权

US06881792B2 Production processes for basic water-absorbent resin and water-absorbing agent, and use thereof 有权
标题翻译：碱性吸水性树脂和吸水剂的制造方法及其用途
公开(公告)号：US06881792B2
公开(公告)日：2005-04-19
申请号：US10689075
申请日：2003-10-21
申请人： Nobuyuki Harada , Shigeru Sakamoto , Yoshifumi Adachi , Kazuhisa Hitomi , Kazushi Torii , Toshimasa Kitayama
发明人： Nobuyuki Harada , Shigeru Sakamoto , Yoshifumi Adachi , Kazuhisa Hitomi , Kazushi Torii , Toshimasa Kitayama
IPC分类号： A61L15/22 , C08J3/12 , C08J3/24 , C08F8/00
CPC分类号： C08J3/245 , C08J3/12 , C08J3/122 , C08J2300/14 , Y10T428/2982
摘要： The present invention provides: a production process for a basic water-absorbent resin to be a main component of a water-absorbing agent which exhibits an excellent water absorption capacity under a load with high productivity; a production process for a water-absorbing agent; and use thereof. The production process for an irregular shape basic water-absorbent resin comprises the step of reacting a basic resin and a crosslinking agent in order to obtain the basic water-absorbent resin, with the process forwarding a crosslinking reaction and pulverizing the resultant product at the same time. The first production process for a water-absorbing agent comprises the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the above-mentioned process. The second production process for a water-absorbing agent comprises the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the above-mentioned process.
摘要翻译：本发明提供：作为吸水剂的主要成分的碱性吸水性树脂的制造方法，其在高生产率的负载下表现出优异的吸水能力; 吸水剂的生产方法; 及其用途。不规则形状的基本吸水性树脂的制造方法包括使碱性树脂和交联剂反应以获得碱性吸水性树脂的步骤，其中进行交联反应并将所得产物在相同的条件下粉碎时间。吸水剂的第一种制备方法包括将酸性吸水性树脂与通过上述方法获得的碱性吸水性树脂混合的步骤。吸水剂的第二制造方法包括以下步骤：当进行交联反应和粉碎时，通过与酸性吸水性树脂共存获得酸性吸水性树脂和碱性吸水性树脂的混合物上述过程。

10. 发明授权

US09187579B2 Particle-shaped water absorbing agent and method for producing the same 有权
标题翻译：颗粒状吸水剂及其制造方法
公开(公告)号：US09187579B2
公开(公告)日：2015-11-17
申请号：US12524989
申请日：2008-02-04
申请人： Hiroyuki Ikeuchi , Hirotama Fujimaru , Makoto Nagasawa , Kazuhiko Sakamoto , Shigeru Sakamoto , Kazushi Torii , Ryoko Tahara
发明人： Hiroyuki Ikeuchi , Hirotama Fujimaru , Makoto Nagasawa , Kazuhiko Sakamoto , Shigeru Sakamoto , Kazushi Torii , Ryoko Tahara
IPC分类号： B01J20/22 , B01J20/26 , C08F20/06 , C08F2/44 , C08F220/06 , C08L33/02 , A61F13/53 , C08F222/10 , C08K5/00 , C08L71/02
CPC分类号： C08F2/44 , A61F2013/530583 , C08F220/06 , C08F222/1006 , C08K5/0008 , C08L33/02 , C08L71/02 , Y10T428/2982 , C08L2666/22
摘要： An object of the present invention is to provide a particle-shaped water absorbing agent having a remarkably improved surface color and excellent water-absorbing properties (better water absorption capacity, and lower water soluble content and residual monomer content) at the same time. In order to attain the object, a particle-shaped water absorbing agent according to the present invention is a particle-shaped water absorbing agent whose main component is a polyacrylic acid and/or a salt thereof, the particle-shaped water absorbing agent having a surface color of Hunter b value in a range of −5 to 10, and having a cross-linking absorption property index (CPI) in a range of 1 to 100, the CPI defined by the following two equations: GEX=(GVs+17)/Ln (water soluble content); Equation 1: CPI=(GEX/residual monomer content)×100 Equation 3: where GVs is gel volume in saline, Ln (water soluble content) is a logarithm natural of water soluble content.
摘要翻译：本发明的目的是提供一种具有显着改善的表面颜色和优异的吸水性（更好的吸水能力，更低的水溶性含量和残留的单体含量）的颗粒状吸水剂。为了达到上述目的，本发明的颗粒状吸水剂是主要成分为聚丙烯酸和/或其盐的颗粒状吸水剂，该颗粒状吸水剂具有 Hunter b值的表面颜色在-5至10的范围内，并且交联吸收特性指数（CPI）在1至100的范围内，由以下两个等式定义的CPI：GEX =（GVs + 17 ）/ Ln（水溶性成分）; 方程1：CPI =（GEX /残留单体含量）×100等式3：其中GV是盐水中的凝胶体积，Ln（水溶性含量）是水溶性含量的对数自然。

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