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1. 发明授权

US08188163B2 Process for producing water-absorbing resin 有权
标题翻译：吸水树脂的制造方法
公开(公告)号：US08188163B2
公开(公告)日：2012-05-29
申请号：US12675364
申请日：2008-08-27
申请人： Makoto Matsumoto , Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino , Satoshi Matsumoto , Seiji Kato
发明人： Makoto Matsumoto , Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino , Satoshi Matsumoto , Seiji Kato
IPC分类号： C09B67/00
CPC分类号： C08F6/008 , C08F20/06 , C08J3/12 , C08J3/126 , C08J3/245 , C08J2300/14 , F26B3/08
摘要： A water absorbent resin is dried in a continuous fluidized bed having a heat transfer tube and at least two drying rooms. Pulverization is performed between a first drying room at not less than 80° C. to not more than 200° C. and a second or subsequent room at not less than 100° C. to not more than 220° C. A method for producing a water absorbent resin includes: (1) polymerizing a monomer aqueous solution; (2) drying a hydrogel polymer of step (1); (3) performing particle size control of the dry polymer of the step (2); (5) surface crosslinking the water absorbent resin powder of step (3), and step (4) of performing a second heat drying on the water absorbent resin powder of step (3), preceding step (5). The water absorbent resin has a moisture content of 0 wt % to 3 wt % before the step (5).
摘要翻译：在具有传热管和至少两个干燥室的连续流化床中干燥吸水性树脂。在不低于80℃至不超过200℃的第一干燥室和不低于100℃至不超过220℃的第二或后续室之间进行粉碎。一种生产方法吸水性树脂包括：（1）聚合单体水溶液; （2）干燥步骤（1）的水凝胶聚合物; （3）对步骤（2）的干燥聚合物进行粒度控制; （5）在步骤（5）之前，将步骤（3）的吸水性树脂粉末与步骤（3）的吸水性树脂粉末进行第二次加热干燥的步骤（4）进行表面交联。在步骤（5）之前，吸水性树脂的水分含量为0重量％〜3重量％。

2. 发明申请

US20100249320A1 Process for producing water-absorbing resin 有权
标题翻译：吸水树脂的制造方法
公开(公告)号：US20100249320A1
公开(公告)日：2010-09-30
申请号：US12675364
申请日：2008-08-27
申请人： Makoto Matsumoto , Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino , Satoshi Matsumoto , Seiji Kato
发明人： Makoto Matsumoto , Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino , Satoshi Matsumoto , Seiji Kato
IPC分类号： C08F6/00 , C08F20/04 , F26B3/02
CPC分类号： C08F6/008 , C08F20/06 , C08J3/12 , C08J3/126 , C08J3/245 , C08J2300/14 , F26B3/08
摘要： Drying is performed in a continuous fluidized bed having at least two drying rooms. Drying is performed after pulverization is performed between drying in a first drying room and drying in a second or subsequent room. Drying is performed in a continuous fluidized bed whose fluidized bed contains a heat transfer tube. The second or subsequent drying room has a higher drying temperature than the first drying room. Drying is performed with the drying temperature of the first drying room falling within a range of not less than 80° C. to not more than 200° C. and with the drying temperature of the second or subsequent drying room falling within a range of not less than 100° C. to not more than 220° C. Further, a method for producing a water absorbent resin includes: a sequence of the steps of: (1) polymerizing a monomer aqueous solution; (2) drying a hydrogel polymer obtained in the step (1); (3) performing particle size control by either pulverizing or pulverizing and classifying a dry polymer obtained in the step (2); and (5) performing surface crosslinking on water absorbent resin powder whose particle size has been controlled in the step (3), the method further including the step (4) of performing second heat drying on the water absorbent resin powder whose particle size has been controlled in the step (3), the step (4) preceding the step (5). Further, the water absorbent resin has a moisture content (defined by a loss on drying performed for three hours at 180° C.) of 0 wt % to 3 wt % before it is supplied to the step (5). (This makes it possible to provide a method for producing a water absorbent resin which method makes it possible to obtain a particulate water absorbent resin of excellent properties at low cost with high productivity.
摘要翻译：在具有至少两个干燥室的连续流化床中进行干燥。在第一干燥室中干燥之后进行粉碎并在第二或随后的室中进行干燥之后进行干燥。干燥在其流化床含有传热管的连续流化床中进行。第二干燥室或干燥室的干燥温度比第一干燥室高。在第一干燥室的干燥温度为80℃以上且200℃以下的干燥温度下进行干燥，第二干燥室的干燥温度落在不干燥范围内低于100℃至不超过220℃。此外，吸水性树脂的制造方法包括以下工序：（1）使单体水溶液聚合; （2）干燥步骤（1）中获得的水凝胶聚合物; （3）通过对步骤（2）中获得的干燥聚合物进行粉碎或粉碎和分级来进行粒度控制; 和（5）在步骤（3）中对其粒径进行了控制的吸水性树脂粉末进行表面交联，该方法还包括步骤（4），其在粒径已经达到的吸水性树脂粉末上进行第二加热干燥在步骤（3），在步骤（5）之前的步骤（4）中控制。此外，吸水性树脂在供给步骤（5）之前具有0重量％至3重量％的含水量（在180℃下进行干燥3小时的损失限定）。（这使得可以提供一种生产吸水性树脂的方法，该方法可以以低成本，高生产率获得具有优异性能的颗粒状吸水性树脂。

3. 发明授权

US09175143B2 Method for producing particulate water-absorbent resin 有权
标题翻译：颗粒状吸水性树脂的制造方法
公开(公告)号：US09175143B2
公开(公告)日：2015-11-03
申请号：US13258645
申请日：2010-03-31
申请人： Yorimichi Dairoku , Toshihiro Takaai , Shinichi Fujino , Satoshi Matsumoto
发明人： Yorimichi Dairoku , Toshihiro Takaai , Shinichi Fujino , Satoshi Matsumoto
IPC分类号： C08F20/06 , C08J3/12 , C08J3/24 , C08F220/06
CPC分类号： C08J3/12 , B01J20/267 , B01J2220/68 , C08F20/06 , C08F220/06 , C08J3/245 , C08J2333/02
摘要： A production of a water-absorbent resin by which a particle diameter of the water-absorbent resin can be controlled simply and conveniently, and a content of fine powder can be decreased, without necessity of change of raw materials or expensive facility investment is to be provided. The method is a continuous production method of a polyacrylic acid (salt)-based water-absorbent resin, comprising a polymerization step of an aqueous solution containing acrylic acid (salt), a drying step of the resultant hydrogel-like polymer, a pulverization step of the dried substance, a classification step of the pulverized substance, and optionally a surface cross-linking step of the classified substance, wherein (a) the drying step and the pulverization step are connected via a storage step and a transportation step; and (b) a time of holding the dried substance from a time of completing the drying step to a time of starting the pulverization step is set at 3 minutes or longer.
摘要翻译：可以简单方便地制造吸水性树脂的粒径，并且可以减少细粉的含量，而不需要改变原料或昂贵的设备投资。提供。该方法是以聚丙烯酸（盐）为基础的吸水性树脂的连续制备方法，其包括含有丙烯酸（盐）的水溶液的聚合步骤，所得水凝胶状聚合物的干燥步骤，粉碎步骤干燥物质的分级步骤，以及任选的分级物质的表面交联步骤，其中（a）干燥步骤和粉碎步骤通过储存步骤和运输步骤连接; 和（b）从完成干燥步骤的时间到开始粉碎步骤的时间将干燥物质的时间设定为3分钟以上。

4. 发明申请

US20120016084A1 Method for Producing Particulate Water-Absorbent Resin 有权
标题翻译：生产颗粒吸水树脂的方法
公开(公告)号：US20120016084A1
公开(公告)日：2012-01-19
申请号：US13258645
申请日：2010-03-31
申请人： Yorimichi Dairoku , Toshihiro Takaai , Shinichi Fujino , Satoshi Matsumoto
发明人： Yorimichi Dairoku , Toshihiro Takaai , Shinichi Fujino , Satoshi Matsumoto
IPC分类号： C08J3/12 , C08F8/14 , C08F8/30 , C08F8/42 , C08F8/32 , C08F2/10 , C08F8/18
CPC分类号： C08J3/12 , B01J20/267 , B01J2220/68 , C08F20/06 , C08F220/06 , C08J3/245 , C08J2333/02
摘要： A production of a water-absorbent resin by which a particle diameter of the water-absorbent resin can be controlled simply and conveniently, and a content of fine powder can be decreased, without necessity of change of raw materials or expensive facility investment is to be provided. The method is a continuous production method of a polyacrylic acid (salt)-based water-absorbent resin, comprising a polymerization step of an aqueous solution containing acrylic acid (salt), a drying step of the resultant hydrogel-like polymer, a pulverization step of the dried substance, a classification step of the pulverized substance, and optionally a surface cross-linking step of the classified substance, wherein (a) the drying step and the pulverization step are connected via a storage step and a transportation step; and (b) a time of holding the dried substance from a time of completing the drying step to a time of starting the pulverization step is set at 3 minutes or longer.
摘要翻译：可以简单方便地制造吸水性树脂的粒径，并且可以减少细粉的含量，而不需要改变原料或昂贵的设备投资。提供。该方法是以聚丙烯酸（盐）为基础的吸水性树脂的连续制备方法，其包括含有丙烯酸（盐）的水溶液的聚合步骤，所得水凝胶状聚合物的干燥步骤，粉碎步骤干燥物质的分级步骤，以及任选的分级物质的表面交联步骤，其中（a）干燥步骤和粉碎步骤通过储存步骤和运输步骤连接; 和（b）从完成干燥步骤的时间到开始粉碎步骤的时间将干燥物质的时间设定为3分钟以上。

5. 发明授权

US08420752B2 Production method and production apparatus of particulate water absorbing agent containing water absorbent resin as main component 有权
标题翻译：以吸水树脂为主要成分的颗粒吸水剂的生产方法和生产设备
公开(公告)号：US08420752B2
公开(公告)日：2013-04-16
申请号：US12933524
申请日：2009-03-31
申请人： Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino
发明人： Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino
IPC分类号： C08F2/04 , C08F20/06 , B01J19/24 , C07C57/07
CPC分类号： C08J3/245 , A61L15/60 , B01J19/0086 , B01J2219/00006 , C07C51/41 , C07C51/50 , C08F2/10 , C08F2/48 , C08F20/06 , C08F220/06 , C08F222/1006 , C08J2333/02 , Y10T137/4673 , Y10T137/469 , Y10T137/86187
摘要： An apparatus (2) includes a neutralization tank (3), a pump (4), a heat exchanger (6), a line mixer (8), a polymerizer (10), a first pipe (12), a second pipe (14), a third pipe (16), a fourth pipe (18), and a fifth pipe (20). Continuously supplied into the neutralization tank (3) are a monomer aqueous solution and a basic aqueous solution, so as to prepare a mixture solution. The mixture solution is circulated through the first pipe (12), the pump (4), the second pipe (14), the heat exchanger (6), and the third pipe (16). The mixture solution is supplied to the polymerizer through the fourth pipe (18). The apparatus (2) satisfies a requirement that a value X is not more than 200, which value X is found according to the following expression: “X=(V/F)·A”, wherein V is a volume of the mixture solution present in a neutralization system, F is a flow volume of the mixture solution to be supplied to a polymerization system, and A is a contact area of the mixture solution present in the neutralization system with a device(s) and a pipe(s) constituting the neutralization system. With this arrangement, it is possible to provide a water absorbent resin having superior whiteness.
摘要翻译：设备（2）包括中和罐（3），泵（4），热交换器（6），管线混合器（8），聚合器（10），第一管（12），第二管 14），第三管（16），第四管（18）和第五管（20）。连续供给到中和罐（3）中的是单体水溶液和碱性水溶液，以制备混合溶液。混合溶液通过第一管（12），泵（4），第二管（14），热交换器（6）和第三管（16）循环。混合溶液通过第四管（18）供给聚合反应器。装置（2）满足X值为200以下的要求，根据下式求出X值：X =（V / F）·A，其中，V为混合溶液的体积中和系统F是待供给到聚合体系的混合溶液的流量，A是中和系统中存在的混合溶液与构成该中和系统的装置和管道的接触面积。中和系统通过这种布置，可以提供具有优异白度的吸水性树脂。

6. 发明申请

US20110021725A1 Production method and production apparatus of particulate water absorbing agent containing water absorbent resin as main component 有权
标题翻译：以吸水树脂为主要成分的颗粒吸水剂的生产方法和生产设备
公开(公告)号：US20110021725A1
公开(公告)日：2011-01-27
申请号：US12933524
申请日：2009-03-31
申请人： Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino
发明人： Toshihiro Takaai , Yorimichi Dairoku , Shinichi Fujino
IPC分类号： C08F2/01 , B01J19/00 , C08F220/06
CPC分类号： C08J3/245 , A61L15/60 , B01J19/0086 , B01J2219/00006 , C07C51/41 , C07C51/50 , C08F2/10 , C08F2/48 , C08F20/06 , C08F220/06 , C08F222/1006 , C08J2333/02 , Y10T137/4673 , Y10T137/469 , Y10T137/86187
摘要： An apparatus (2) includes a neutralization tank (3), a pump (4), a heat exchanger (6), a line mixer (8), a polymerizer (10), a first pipe (12), a second pipe (14), a third pipe (16), a fourth pipe (18), and a fifth pipe (20). Continuously supplied into the neutralization tank (3) are a monomer aqueous solution and a basic aqueous solution, so as to prepare a mixture solution. The mixture solution is circulated through the first pipe (12), the pump (4), the second pipe (14), the heat exchanger (6), and the third pipe (16). The mixture solution is supplied to the polymerizer through the fourth pipe (18). The apparatus (2) satisfies a requirement that a value X is not more than 200, which value X is found according to the following expression: “X=(V/F)·A”, wherein V is a volume of the mixture solution present in a neutralization system, F is a flow volume of the mixture solution to be supplied to a polymerization system, and A is a contact area of the mixture solution present in the neutralization system with a device(s) and a pipe(s) constituting the neutralization system. With this arrangement, it is possible to provide a water absorbent resin having superior whiteness.
摘要翻译：设备（2）包括中和罐（3），泵（4），热交换器（6），管线混合器（8），聚合器（10），第一管（12），第二管 14），第三管（16），第四管（18）和第五管（20）。连续供给到中和罐（3）中的是单体水溶液和碱性水溶液，以制备混合溶液。混合溶液通过第一管（12），泵（4），第二管（14），热交换器（6）和第三管（16）循环。混合溶液通过第四管（18）供给聚合反应器。设备（2）满足值X不大于200的要求，根据以下表达式找到该值X：“X =（V / F）·A”，其中V是混合溶液的体积存在于中和系统中，F是供给聚合体系的混合溶液的流动体积，A是中和系统中存在的混合溶液与装置和管道的接触面积，构成中和体系。通过这种布置，可以提供具有优异白度的吸水性树脂。

7. 发明申请

US20120296057A1 METHOD FOR PRODUCING WATER ABSORBENT RESIN 有权
标题翻译：生产吸水树脂的方法
公开(公告)号：US20120296057A1
公开(公告)日：2012-11-22
申请号：US13574281
申请日：2011-01-20
申请人： Toshihiro Takaai , Shinichi Fujino , Hidenori Wada
发明人： Toshihiro Takaai , Shinichi Fujino , Hidenori Wada
IPC分类号： C08F20/06
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.
摘要翻译：在通过干燥具有高固含量浓度（45重量％以上，优选50重量％以上，更优选55重量％以上）的颗粒状水凝胶制造吸水性树脂的方法中，提供了具有保持/改善的物理性能的高效干燥吸水性树脂。公开了一种吸水性树脂的制造方法，其特征在于，包括：使不饱和单体聚合的聚合工序; 干燥步骤，其干燥颗粒状水凝胶交联聚合物，其通过在聚合期间或之后微粒化水凝胶聚合物并且固体成分浓度为45重量％以上，其中颗粒中的过氧化物的量在干燥步骤中要干燥的水凝胶交联聚合物相对于颗粒状水凝胶交联聚合物的固体含量的重量为1至100ppm，干燥步骤中颗粒状水凝胶交联聚合物的干燥温度为160℃，或更多。

8. 发明授权

US09074030B2 Polyacrylic acid-type water absorbent resin and method for producing same 有权
标题翻译：聚丙烯酸型吸水性树脂及其制造方法
公开(公告)号：US09074030B2
公开(公告)日：2015-07-07
申请号：US13807530
申请日：2011-06-29
申请人： Toshihiro Takaai , Hidenori Wada , Shinichi Fujino
发明人： Toshihiro Takaai , Hidenori Wada , Shinichi Fujino
IPC分类号： C08F20/00 , C08J9/20 , A61L15/24 , A61L15/60 , C08F220/06 , C08J3/24 , C08J9/36 , C08F2/01
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
摘要： Provided is a method for producing a water absorbent resin, which promotes the formation of interconnected voids (continuous gas bubbles) in a foamed polymer (foam-like water absorbent resin) by a more convenient method, and produces with high efficiency a water absorbent resin which exhibits a high water absorption rate even when stepped into a sheet form or a powder form in hygiene articles and the like. Disclosed is a a method for producing a polyacrylic acid-type water absorbent resin, comprising (A) a step of obtaining an aqueous solution of acrylic acid-type monomers containing gas bubbles dispersed therein; (B) a step of polymerizing the aqueous monomer solution and thereby obtaining a foamed polymer; and (C) a step of heating and drying the foamed polymer, wherein gas bubbles are incorporated such that the volumetric expansion factor defined by the following formula (1); [Formula 1] Volumetric expansion factor=(Volume of aqueous monomer solution after gas bubble dispersion)/(volume of aqueous mononer solution before gas bubble dispersion) Formula (1); exceeds 1.1 times, and the aqueous monomer solution having a monomer concentration defined by the following formula (2); [Formula 2] Monomer concentration [wt %]=(Weight of a monomer)/{(weight of a monomer)+(weight of solvent)}×100 Formula (2); of 40% by weight or greater is boiling polymerized at a temperature of 100° C. or higher.
摘要翻译：提供一种通过更方便的方法促进发泡聚合物（泡沫状吸水性树脂）中形成互连空隙（连续气泡）的吸水性树脂的制造方法，高效率地制造吸水性树脂即使在卫生用品等中成为片状或粉末状时，也显示出高的吸水率。本发明提供一种聚丙烯酸型吸水性树脂的制造方法，其特征在于，包括：（A）获得含有分散在其中的气泡的丙烯酸型单体的水溶液的工序; （B）使单体水溶液聚合，得到发泡聚合物的工序; 和（C）加热和干燥发泡聚合物的步骤，其中加入气泡，使得由下式（1）定义的体积膨胀系数; [式1]体积膨胀系数=（气泡分散后的单体水溶液的体积）/（气泡分散前的单体溶液的体积）式（1）超过1.1倍，单体浓度由下式（2）定义的单体水溶液; [式2]单体浓度[wt％] =（单体重量）/ {（单体重量）+（溶剂重量）}×100式（2）为40重量％以上时，在100℃以上的温度下进行沸腾聚合。

9. 发明申请

US20130101851A1 POLYACRYLIC ACID-TYPE WATER ABSORBENT RESIN AND METHOD FOR PRODUCING SAME 有权
标题翻译：聚丙烯酸型吸水树脂及其制造方法
公开(公告)号：US20130101851A1
公开(公告)日：2013-04-25
申请号：US13807530
申请日：2011-06-29
申请人： Toshihiro Takaai , Hidenori Wada , Shinichi Fujino
发明人： Toshihiro Takaai , Hidenori Wada , Shinichi Fujino
IPC分类号： C08F20/00
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
摘要： Provided is a method for producing a water absorbent resin, which promotes the formation of interconnected voids (continuous gas bubbles) in a foamed polymer (foam-like water absorbent resin) by a more convenient method, and produces with high efficiency a water absorbent resin which exhibits a high water absorption rate even when stepped into a sheet form or a powder form in hygiene articles and the like. Disclosed is a a method for producing a polyacrylic acid-type water absorbent resin, comprising (A) a step of obtaining an aqueous solution of acrylic acid-type monomers containing gas bubbles dispersed therein; (B) a step of polymerizing the aqueous monomer solution and thereby obtaining a foamed polymer; and (C) a step of heating and drying the foamed polymer, wherein gas bubbles are incorporated such that the volumetric expansion factor defined by the following formula (1); [Formula 1] Volumetric expansion factor=(Volume of aqueous monomer solution after gas bubble dispersion)/(volume of aqueous monomer solution before gas bubble dispersion) Formula (1) ; exceeds 1.1 times, and the aqueous monomer solution having a monomer concentration defined by the following formula (2); [Formula 2] Monomer concentration [wt %]=(Weight of a monomer)/{(weight of a monomer)+(weight of solvent)}×100 Formula (2) ; of 40% by weight or greater is boiling polymerized at a temperature of 100° C. or higher.
摘要翻译：提供一种通过更方便的方法促进发泡聚合物（泡沫状吸水性树脂）中形成互连空隙（连续气泡）的吸水性树脂的制造方法，高效率地制造吸水性树脂即使在卫生用品等中成为片状或粉末状时，也显示出高的吸水率。本发明提供一种聚丙烯酸型吸水性树脂的制造方法，其特征在于，包括：（A）获得含有分散在其中的气泡的丙烯酸型单体的水溶液的工序; （B）使单体水溶液聚合，得到发泡聚合物的工序; 和（C）加热和干燥发泡聚合物的步骤，其中加入气泡，使得由下式（1）定义的体积膨胀系数; [式1]体积膨胀系数=（气泡分散后的单体水溶液体积）/（气泡分散前的单体溶液的体积）式（1）超过1.1倍，单体浓度由下式（2）定义的单体水溶液; [式2]单体浓度[wt％] =（单体重量）/ {（单体重量）+（溶剂重量）}×100式（2）为40重量％以上时，在100℃以上的温度下进行沸腾聚合。

10. 发明授权

US09321855B2 Method for producing water absorbent resin 有权
标题翻译：吸水树脂的制造方法
公开(公告)号：US09321855B2
公开(公告)日：2016-04-26
申请号：US13574281
申请日：2011-01-20
申请人： Toshihiro Takaai , Shinichi Fujino , Hidenori Wada
发明人： Toshihiro Takaai , Shinichi Fujino , Hidenori Wada
IPC分类号： C08J9/28 , C08F6/00 , A61L15/60 , B01J20/26 , B01J20/28 , C08J3/24 , C08F20/06 , C08F20/04 , C08J3/12
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.
摘要翻译：在通过干燥具有高固含量浓度（45重量％以上，优选50重量％以上，更优选55重量％以上）的颗粒状水凝胶制造吸水性树脂的方法中，提供了具有保持/改善的物理性能的高效干燥吸水性树脂。公开了一种吸水性树脂的制造方法，其特征在于，包括：使不饱和单体聚合的聚合工序; 干燥步骤，其干燥颗粒状水凝胶交联聚合物，其通过在聚合期间或之后微粒化水凝胶聚合物并且固体成分浓度为45重量％以上，其中颗粒中的过氧化物的量在干燥步骤中要干燥的水凝胶交联聚合物相对于颗粒状水凝胶交联聚合物的固体含量的重量为1至100ppm，干燥步骤中颗粒状水凝胶交联聚合物的干燥温度为160℃，或更多。

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