发明名称 |
METHOD FOR PRODUCING WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER, AND WATER ABSORBENT POLYACRYLIC ACID (SALT) RESIN POWDER |
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. |
申请公布号 |
EP2557095(A1) |
申请公布日期 |
2013.02.13 |
申请号 |
EP20110765979 |
申请日期 |
2011.04.07 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
MACHIDA, SAYAKA;TORII, KAZUSHI;SHIRAI, YOKO;IKEUCHI, HIROYUKI;SAKAMOTO, SHIGERU;TACHI, KOJI;NAKATSURU, REIKO |
分类号 |
C08F6/00;C08F220/06;C08J3/12 |
主分类号 |
C08F6/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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