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Abstract

The present invention relates to a copolymer which is obviously by polymerizing monomer components comprising: (a) a compound represented by formula (A1): Y—B-0-(A-0)_mR²(A1) wherein Y represents an alkenyl group containing two or more carbon atoms, B represents a C_2-18 oxyalkylene group; R² represents a hydrogen atom or a C_1-30 hydrocarbon group and m represents an integer of from 0 to 300; and/or an addition product obtained by the addition of 0-8 moles of any alkylene oxide having 2 to 4 carbon atoms to one equivalent of amino residues in polyamide polyamine obtained by condensation of 1.0 moles of apolyalkylene polyamine, 0.8-0.95 mole of a dibasic acid or an ester of the dibasic acid with a lower alcohol having 1 to 4 carbon atoms, and 0.05-0.18 mole of acrylic acid or methacrylic acid, or an ester of acrylic acid or methacrylic acid with a lower alcohol having 1 to 4 carbon atoms; (b) an unsaturated monocarboxylic acid or a salt thereof, or an unsaturated dicarboxylic carboxylic acid or a salt thereof or an anyhydride of an unsaturated cicarboxylic acid; and (c) a compound represent by formula (C): R¹¹R¹²C═CR¹³—(CR³R⁴)_n—O—CO—CH═CH—COOR¹⁶(C) wherein R³ and R⁴ independently from each other are hydrogen or an alkyl group, wherein one of R¹¹, R¹² and R¹³ is methyl and the other two groups are hydrogen or wherein all of R¹¹, R¹² and R¹³ are hydrogen, wherein R¹⁶ is hydrogen, an alkaline metal atom, an earth alkaline metal atom, ammonium or an organic ammonium group and wherein n is 1 or 2 and to a dispersant inorganic binders (such as cement) comprising said copolymer; and, when m is 0, esterifying the resulting copolymer with a compound of formula HO-(A-O—)₂R², wherein R² represents a hydrogen atom or a C_1-30 hydrocarbon group and z represents an integer of from 1 to 300.

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First Claim