发明名称 |
WATER-ABSORBENT AND PROCESS FOR PREPARING THE SAME |
摘要 |
A hydrogel polymer obtained by polymerizing a monomer component including acrylic acid (salt) is post-neutralized so that each of polymer particles derived from a polymer produced by neutralizing the hydrogel polymer has an allowable neutralization ratio. The polymer as obtained by neutralizing the hydrogel polymer is reacted with a crosslinking agent reactive to a functional group of the polymer. The allowable neutralization ratio, for example, is a neutralization ratio which is not lower, by not less than 20 mole percent, or more than, at least 55 mole percent, than an average neutralization ratio of a mass of the polymer particles, and the post-neutralization is carried out so that a number of polymer particles having a non-allowable neutralization ratio outside the allowable neutralization range is not more than 10 in 200 polymer particles, thus obtaining a water-absorbent agent having high absorbency under no applied pressure and high pressure wherein the amount of water soluble component is lower compared with the conventional water-absorbent agent and a change in pH of a swollen gel is small. <IMAGE> |
申请公布号 |
EP0882502(A4) |
申请公布日期 |
2002.11.13 |
申请号 |
EP19970933898 |
申请日期 |
1997.08.05 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
YANASE, TORU;KIMURA, KAZUKI;FUJINO, SHIN-ICHI;NAGASUNA, KINYA;ISHIZAKI, KUNIHIKO;FUJIMARU, HIROTAMA;HARADA, NOBUYUKI |
分类号 |
A61L15/60;B01J20/26;C08F2/00;C08F8/00;C08F8/44 |
主分类号 |
A61L15/60 |
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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