Cement dispersing polymers for high flow, high strength and selfcompacting concrete

A water-soluble acrylic copolymer with cement dispersing, set-accelerating and anticorrosive properties to steel,

• obtained by copolymerization of an α,β-olefinic monocarboxylic acid or its salt shown by formula 1 given below,
• a second acrylic monomer shown by formula 2 given below, optionally a third-acrylic monomer shown by formula 3 given below, a fourth acrylic monomer shown by formula 4 given below, and optionally a fifth acrylic monomer given by formula 5,
• such that the molar ratio of constituent monomer units 1, 2, 3, 4, and 5 is
• a:b:c:d:e=1:(0.01-0.80):(0-0.80):(0.001-0.3):(0-0.5), and
• a:(b+c+d+e)=0.1:0.9 to 0.9:0.1,
• wherein
• a designates the molar concentration range of constituent monomers 1,
• b designates the molar concentration range of constituent monomers 2,
• c designates the molar concentration range of constituent monomers 3,
• d designates the molar concentration range of constituent monomers 4,
• e designates the molar concentration range of constituent monomers 5,
• said monomers having the structural formulas shown below:
• wherein each R independently from each other represents a hydrogen atom or a methyl group,
• R1 and R2 independently from each other represent a C1-C4-alkyl, a hydroxyethyl (CH2CH2OH) group, an acetoxyethyl group (CH2CH2OCOCH3) group, a hydroxy-isopropyl (CH2—CHOH—CH3) group, an acetoxy-isopropyl (CH2—CHOCOCH3) group, or R1 and R2 may together with the nitrogen atom to which they are bonded, form a morpholine ring;
• R3 is a C1-C4-alkyl,
• R4 and R5 independently represent an aliphatic, cyoloaliphatic, araliphatic or aromatic or R4 and R5 may together with the nitrogen atom to which they are bonded form a morpholine or imidazole ring system,
• M represents hydrogen, an alkali metal ion, an alkaline earth metal ion, an aluminum ion, an ammonium- or organic ammonium group;
• and
• x and y independently represent integers from 2-300.