| 发明名称 |
Use of cellulose mixed ethers as additives for earth pressure shields |
| 摘要 |
The present invention relates to water-soluble, particularly ternary, preferably ionic, cellulose mixed ethers, more particularly to anionic water-soluble cellulose mixed ethers, as additives for drilling fluid applications.
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| 申请公布号 |
US5808052(A) |
申请公布日期 |
1998.09.15 |
| 申请号 |
US19960662751 |
申请日期 |
1996.06.10 |
| 申请人 |
WOLFF WALSRODE AG |
发明人 |
SZABLIKOWSKI, KLAUS;LANGE, WERNER;PANNEK, JOERN-BERND;KIESEWETTER, RENE |
| 分类号 |
E21D9/13;B01F17/00;C08B11/193;C09K8/035;C09K8/38;C09K17/32;E21D9/06;(IPC1-7):C08B11/193;C08B11/08;C09K7/00 |
主分类号 |
E21D9/13 |
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