摘要 |
<p>Use of at least one copolymer or its salts comprising at least one substituted ethylene unit (I) or (II) as water reducing agent in hydraulic binders, where the copolymer has a molecular weight of 10000-400000 Daltons, and the copolymer contains no crosslinking units, is claimed. Use of at least one copolymer or its salts comprising at least one substituted ethylene unit of formula (-CR 1>R 2>-CR 3>(-[CH 2] m-[C(=O)] n-[W 1>] q-[R 4>-O-] r-R 5>)-) (I) or (-CR1aR2a-CR3a(-[CH 2] m-C(=O)-[W 1>] q-[R 4>-O-] r-R 8>)-) (II) as water reducing agent in hydraulic binders, where the copolymer has a molecular weight of 10000-400000 Daltons, and the copolymer contains no crosslinking units, is claimed. R 1>-R 3> : H, phenyl or 1-20C alkyl; R1a-R3a : H, 1-20C alkyl, phenyl, or COOR 9>; R 9> : H, 1-4C alkyl or monovalent, divalent, or trivalent quaternary ammonium group; R 4> : 2-20C alkyl; R 5> : group of formula (-P(OR 6>)(=O)-OR 6>) or (-[CH 2] t-NR 7>-[CH 2] t-PO 3(R 6>) 2); R 6> : H, 1-20C alkyl, or monovalent, divalent, or trivalent quaternary ammonium group; R 7> : H, 1-18C alkyl, or group of formula (-[CH 2] t-PO 3(R 6>) 2); R 8> : 1-20C alkyl or H; W 1> : O, NH or N; m : 0-2; n, q : 0 or 1; r : 0-500; and t : 0-18. Independent claims are included for: (1) hydraulic binder comprising at least one copolymer or its salt; and (2) elements for the construction field obtained from a hydraulic binder.</p> |