| 摘要 |
PCT No. PCT/EP97/01730 Sec. 371 Date May 22, 1998 Sec. 102(e) Date May 22, 1998 PCT Filed Apr. 8, 1997 PCT Pub. No. WO97/39037 PCT Pub. Date Oct. 23, 1997The invention relates to a random styrene-maleic anhydride (SMA) copolymer in free acid or salt form wherein the copolymer has the following types and numbers of monomer units in which M is selected from hydrogen, a cation and a residue of a hydrophobic polyalkylene glycol or polysiloxane, R is the residue of methylpoly(ethylene)glycol of molecular weight (weight-average) 900-2000, x=0.35-0.75 and y=0.25-0.65. These copolymers are particularly useful as superplasticizers in cementitious compositions such as concretes and mortars.
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