| 摘要 |
The curing time of cementitious cellulose ether comprising-compositions can be controlled by incorporation into the composition i) a cationically-modified or a secondary or tertiary amino-modified cellulose ether or ii) a cellulose ether comprising a hydroxyethoxyl substituent alone or in combination with one or more other substituents bound to oxygen, wherein the ethylene oxide molar substitution MS<SUB>hydroxyethoxyl </SUB>is either from 2.2 to 3.2 and the percentage of unsubstituted anhydroglucose units is up to 8.5 percent or the ethylene oxide molar substitution MS<SUB>hydroxyethoxyl </SUB>is less than 2.2 and the percentage of unsubstituted anhydroglucose units is up to 12 percent.
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