| 摘要 |
PROBLEM TO BE SOLVED: To obtain an additive for cement which reduces deposition of a cement composition onto a bucket, a hopper, or the like used for transport at application of the cement composition, improves workability of the cement composition and reduces industrial wastes such as washing waste water and sludge. SOLUTION: This additive for cement contains a polyether compound (A) of formula (1) or (2) (wherein Z is a residue of a compound having≥20 nitrogen atoms and 40-250 active hydrogens bound to the nitrogen atoms; A<SP>1</SP>O and A<SP>2</SP>O are each a specific 2-4C oxyalkylene group; (a) and (b) satisfy the relation: 1<b/a≤50; R<SP>1</SP>is hydrogen atom or a 1-8C hydrocarbon group; and (n) is 40-250). COPYRIGHT: (C)2005,JPO&NCIPI
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