| 发明名称 |
Cement admixture and cement composition |
| 摘要 |
The invention provides: a cement admixture which has excellent cement dispersibility and can afford high slump retainability; and a cement composition which has excellent cement dispersibility and high slump retainability. The cement admixture comprises a polycarboxylic acid as an effective component, wherein the polycarboxylic acid is obtained by a process including the steps of: charging "a" parts by weight of a polyalkylene glycol (A) and "b" parts by weight of a (meth)acrylic acid monomer (B) into a reactor in the range of {(a/n+E,fra 1/2+EE )/b}x100</=200, wherein n is an average molar number of the added oxyalkylene groups in the polyalkylene glycol (A) and is a number of 1 to 300; carrying out an esterification reaction of the resultant mixture in the reactor, thus obtaining a polyalkylene glycol (meth)acrylate (C); and copolymerizing the resultant polyalkylene glycol (meth)acrylate (C) and the (meth)acrylic acid monomer (B), thus obtaining the polycarboxylic acid.
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| 申请公布号 |
US6166112(A) |
申请公布日期 |
2000.12.26 |
| 申请号 |
US19980082835 |
申请日期 |
1998.05.21 |
| 申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
HIRATA, TSUYOSHI;YUASA, TSUTOMU;NAGARE, KOICHIRO |
| 分类号 |
C04B24/26;C04B24/32;C08F220/06;C08F222/10;C08F283/01;C08F290/06;C08F290/14;C08G65/332;C08L71/02;(IPC1-7):C08K3/00 |
主分类号 |
C04B24/26 |
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