Multipurpose cement dispersing polymers for high flow and high strength concrete

A modified acrylic polymer prepared by reacting, in the presence of sulfuric acid or p-toluene sulfonic acid, 1 mol of a poly(acrylic acid) A-1 or a C1-C5-ester thereof, having a number average molecular weight of from 500 to 20,000,

• with 0.01-0.30 mol of a tertiary alkanolamine or a derivative thereof, represented by formula B-1,
• and, optionally,
• with 0-0.80 mol of a monofunctional polyalkyleneglycol-monoalkylether, represented by formula D-1,
• Ho—(CH2CHRO)x—R3 D-1
• and/or optionally
• with 0-0.60 mol of an α-amino-polyalkyleneglycol-ω-alkylether of formula E-1,
• H2N—(CH2CHRO)y—R3 E-1
• wherein each R independently represents a hydrogen atom or a methyl group;
• R1 and R2 independently represent a methyl group, a hydroxyethyl (CH2CH2OH) group, an acetoxyethyl (CH2CH2OCOCH3) group, a hydroxy-isopropyl (CH2—CHOH—CH3) group, or an acetoxy-isopropyl(CH2—CHOCOCH3—CH3) group;
• R3 is a C1-C4-alkyl group, M represents hydrogen, a C1-C5-alkyl group or an alkali metal ion, an alkaline earth metal ion or an ammonium group or a mixture thereof;
• a is an integer of 5 to 270;
• x and y independently represent integers from 2-250, and wherein the monofunctional polyalkyleneglycol-monoalkylether of formula D-1, and/or the α-amino-polyalkyleneglycol-ω-alkylether of formula E-1 is present during the reaction.