发明名称 |
METHOD OF PRODUCING ABSORBENT RESIN |
摘要 |
Provided is a method which does not require alteration of the raw materials or high capital investment, and improves and stabilizes the physical property (for example, liquid permeability) of a water absorbent resin by means of a simple technique. A method for producing a water absorbent resin is disclosed, which method includes a polymerization step of polymerizing an aqueous solution of acrylic acid (salt) to obtain a water-containing gel-like crosslinked polymer; a drying step of drying the water-containing gel-like crosslinked polymer to obtain a water absorbent resin powder; a classification step of classifying the water absorbent resin powder; and a surface crosslinking step of surface crosslinking the water absorbent resin powder, wherein in the classification steps that are carried before the surface crosslinking step and/or after the surface crosslinking step, the stretch tension (tension) of the metal sieve mesh used in the classification step is from 35 [N/cm] to 100 [N/cm]. |
申请公布号 |
EP2548910(A4) |
申请公布日期 |
2015.03.25 |
申请号 |
EP20110756400 |
申请日期 |
2011.03.17 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
OKUDA, SUMIO;KANZAKI, SYUJI;ISHIZAKI, KUNIHIKO;FUJINO, SHINICHI;NOGI, KOZO |
分类号 |
C08J3/12;B01J20/26;B07B1/28;B07B1/46;B07B1/56;B07B9/00;C08F6/00;C08F20/06;C08F120/06;C08F220/06;C08J3/075;C08J3/24 |
主分类号 |
C08J3/12 |
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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