发明名称 |
POLYACRYLIC ACID (SALT) WATER ABSORBENT RESIN AND METHOD FOR PRODUCING SAME |
摘要 |
Disclosed is a method for producing a water absorbent resin, by which a surface-crosslinked water absorbent resin having excellent physical properties can be efficiently obtained at low cost, while assuring high productivity. When the production scale is increased to a continuous production at 1 t/hr or more, the physical properties are improved and stabilized (for example, standard deviation of the physical properties is reduced) by a surface-crosslinking treatment, and the absorption against pressure (AAP) and liquid permeability (SFC) are further improved. Specifically disclosed is a method for producing a water absorbent resin, which is characterized in that the stirring shaft of the continuous mixing apparatus for the surface-crosslinking agent is heated during the mixing step of the surface-crosslinking agent or that the continuous mixing apparatus for the surface-crosslinldng agent is operated at a pressure that is reduced relative to the ambient pressure and a gas flow is passed through the mixing apparatus during the mixing of the surface-crosslinking agent so that the gas flow in the mixing apparatus is 40°C or more (when defined with respect to the gas temperature at the exit). |
申请公布号 |
EP2471844(B1) |
申请公布日期 |
2016.03.30 |
申请号 |
EP20100812021 |
申请日期 |
2010.08.27 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
NOGI, KOZO;ISHIZAKI, KUNIHIKO;KANZAKI, SYUJI |
分类号 |
C08J3/24;A61L15/24;A61L15/60;C08F120/06;C08F220/06 |
主分类号 |
C08J3/24 |
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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