| abstract |
The curing time of the cellulose ether containing cement composition comprises i) a cation-modified or secondary or tertiary amino-modified cellulose ether, or ii) a hydroxyethoxyl substituent, alone or in combination with one or more other substituents bonded to oxygen. Cellulose ether wherein ethylene oxide molar substituted MS hydroxyethoxyl is 2.2 to 3.2 and the percentage of unsubstituted anhydroglucose unit is 8.5% or less, or ethylene oxide molar substituted MS hydroxyethoxyl is less than 2.2, The percentage of unsubstituted anhydroglucose units is 12% or less) can be adjusted by incorporating into the cement composition. |