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1. 发明授权

US10662300B2 Method for producing polyacrylic acid (salt)-based water-absorbent resin 有权
公开(公告)号：US10662300B2
公开(公告)日：2020-05-26
申请号：US14888964
申请日：2014-05-09
申请人： Nippon Shokubai Co., Ltd.
发明人： Motohiro Imura , Hidenori Wada , Seiji Kato
IPC分类号： C08J3/24 , A61L15/24
摘要： A method is disclosed for inexpensively and stably producing, with high productivity, water absorbent resin having excellent damage resistance. 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.

2. 发明申请

US20150240013A1 PROCESS FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER ABSORBENT RESIN 有权
标题翻译：生产聚丙烯酸（盐） - 水吸收树脂的方法
公开(公告)号：US20150240013A1
公开(公告)日：2015-08-27
申请号：US14418796
申请日：2013-08-01
申请人： Nippon Shokubai Co., Ltd.
发明人： Makoto Matsumoto , Seiji Kato , Shinichi Fujino , Noboru Nabara , Ryuichi Otani , Yasuhiro Kawaguchi , Narimasa Okugawa , Kentaro Ichikawa , Makoto Eto
IPC分类号： C08F222/02 , C08F222/10
CPC分类号： C08F222/02 , B07B1/28 , B07B1/46 , B07B1/50 , B07B1/54 , B07B1/56 , B07B2201/04 , C08F220/06 , C08F222/1006 , C08J3/245 , C08J2333/02
摘要： Provided is a method for producing a polyacrylic acid (salt)-based water absorbent resin in which the physical properties (especially liquid permeability) are improved and maintained even in large scale production. The method for producing a polyacrylic acid (salt)-based water absorbent resin, which sequentially includes a polymerization step, in which a monomer aqueous solution having acrylic acid (salt) as a main component is polymerized, a drying step, in which a water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, and a classification step, in which a polymer obtained in the drying step is classified, wherein a rocking-type sieve classification apparatus is used in the classification step, and the rocking-type sieve classification apparatus has a sieve net having a trajectory and a rotation speed in the following ranges; radial gradient R: from 5 to 40 mm, tangential gradient T: from 0.1 to 25 mm, eccentric gradient E: from 40 to 80 mm, and rotation speed F: from 60 to 600 rpm.
摘要翻译：本发明提供一种即使在大规模生产中改善和维持物理性质（尤其是液体渗透性）的聚丙烯酸（盐）基吸水树脂的制备方法。以聚丙烯酸（盐）为主成分的单体水溶液聚合的顺序包括聚合工序的聚丙烯酸（盐）系吸水性树脂的制造方法为干燥工序，将在聚合工序中得到的凝胶状交联聚合物进行干燥，对分级工序进行分类，其中在干燥步骤中获得的聚合物被分级，其中在分级步骤中使用摇摆式筛分分级装置，型筛分分级装置具有轨迹和转速在以下范围内的筛网; 径向梯度R：5〜40mm，切向梯度T：0.1〜25mm，偏心梯度E：40〜80mm，转速F：60〜600rpm。

3. 发明授权

US09796820B2 Method for producing water absorbent resin 有权
公开(公告)号：US09796820B2
公开(公告)日：2017-10-24
申请号：US14136339
申请日：2013-12-20
申请人： Nippon Shokubai Co., Ltd.
发明人： Kenji Kadonaga , Kenji Tada , Masazumi Sasabe , Seiji Kato
IPC分类号： C08J3/24 , C08F20/06 , B01F7/00 , B01F7/16 , C08F220/06
CPC分类号： C08J3/245 , B01F7/00466 , B01F7/169 , C08F20/06 , C08F220/06 , C08J2333/02
摘要： The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.

4. 发明授权

US11459431B2 Method for producing polyacrylic acid (salt)-based water absorbent resin 有权
公开(公告)号：US11459431B2
公开(公告)日：2022-10-04
申请号：US16904428
申请日：2020-06-17
申请人： NIPPON SHOKUBAI CO., LTD.
发明人： Hidenori Wada , Motohiro Imura , Katsuyuki Wada , Seiji Kato
IPC分类号： C08J3/24 , C08J3/075 , A61L15/24 , A61L15/42 , A61L15/60
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).

5. 发明授权

US09550843B2 Method for producing polyacrylic acid (salt)-based water absorbent resin 有权
标题翻译：制备聚丙烯酸（盐）基吸水树脂的方法
公开(公告)号：US09550843B2
公开(公告)日：2017-01-24
申请号：US14647311
申请日：2013-11-27
申请人： NIPPON SHOKUBAI CO., LTD.
发明人： Satoshi Matsumoto , Makoto Matsumoto , Seiji Kato , Kazumasa Konishi , Kenji Kadonaga , Shinichi Fujino
IPC分类号： C08F120/06 , C08J3/12 , C08F22/02 , C08J3/24
CPC分类号： C08F22/02 , C08J3/245 , C08J2333/02
摘要： An object of the present invention is to provide a simple method for improving and stabilizing the physical properties (for example, liquid permeability) of a water absorbent resin, without requiring investment in expensive facilities or modification of raw materials. In particular, the object is to provide a method which is useful in the large-scale production of a water absorbent resin. The method for producing polyacrylic acid (salt)-based water absorbent resin of the present invention includes, in order, a step in which an acrylic acid (salt)-based monomer aqueous solution is polymerized, a step in which the water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, a step in which the dried polymer obtained in the drying step is pulverized, and a classification step which takes place after the drying step or after the pulverizing step, wherein, at the time of providing the dried polymer to the roll mill used in the pulverizing step, the dried polymer is provided in a dispersed state in the axial direction of the roll of the roll mill.
摘要翻译：本发明的目的是提供一种用于改善和稳定吸水性树脂的物理性能（例如透液性）的简单方法，而不需要投资昂贵的设备或改变原料。特别地，本发明的目的是提供一种在大规模生产吸水性树脂中有用的方法。本发明的聚丙烯酸（盐）系吸水性树脂的制造方法依次包括丙烯酸（盐）类单体水溶液聚合的工序，其中含水凝胶在聚合步骤中获得的类似的交联聚合物被干燥，将在干燥步骤中获得的干燥聚合物粉碎的步骤和在干燥步骤之后或粉碎步骤之后发生的分级步骤，其中在将干燥的聚合物提供给在粉碎步骤中使用的辊磨机中，干燥的聚合物以辊磨机的辊的轴向分散状态提供。

6. 发明授权

US09644058B2 Process for producing polyacrylic acid (salt)-based water absorbent resin 有权
公开(公告)号：US09644058B2
公开(公告)日：2017-05-09
申请号：US14418796
申请日：2013-08-01
申请人： Nippon Shokubai Co., Ltd.
发明人： Makoto Matsumoto , Seiji Kato , Shinichi Fujino , Noboru Nabara , Ryuichi Otani , Yasuhiro Kawaguchi , Narimasa Okugawa , Kentaro Ichikawa , Makoto Eto
IPC分类号： C08F222/02 , C08J3/12 , C08F220/06 , C08J3/24 , B07B1/46 , B07B1/54 , C08F222/10 , B07B1/28 , B07B1/50 , B07B1/56
CPC分类号： C08F222/02 , B07B1/28 , B07B1/46 , B07B1/50 , B07B1/54 , B07B1/56 , B07B2201/04 , C08F220/06 , C08F222/1006 , C08J3/245 , C08J2333/02
摘要： Provided is a method for producing a polyacrylic acid (salt)-based water absorbent resin in which the physical properties (especially liquid permeability) are improved and maintained even in large scale production. The method for producing a polyacrylic acid (salt)-based water absorbent resin, which sequentially includes a polymerization step, in which a monomer aqueous solution having acrylic acid (salt) as a main component is polymerized, a drying step, in which a water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, and a classification step, in which a polymer obtained in the drying step is classified, wherein a rocking-type sieve classification apparatus is used in the classification step, and the rocking-type sieve classification apparatus has a sieve net having a trajectory and a rotation speed in the following ranges; radial gradient R: from 5 to 40 mm, tangential gradient T: from 0.1 to 25 mm, eccentric gradient E: from 40 to 80 mm, and rotation speed F: from 60 to 600 rpm.

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