Cement dispersion agents
AssigneeTakemoto Yushi Kabushiki Kaisha
InventorsMitsuo Kinoshita, Yoshimasa Miura, Tsuneo Yamamoto
Life of this patent
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Abstract
Cement dispersion agents containing a graft copolymer composed of four kinds of constituent unit each having a specified structure can provide improved fluidity to cementing compositions, prevent slump loss after the kneading process and reduce the drying shrinkage of hardened concrete produced at the same time.
Claims6
A cement dispersion agent containing a graft copolymer comprising first constituent unit shown by Formula (1) given below, second constituent unit shown by Formula (2) given below, third constituent unit shown by Formula (3) given below and fourth constituent unit shown by Formula (4) given below:
- ##STR2## where R.sup.1 .R.sup.5 are each H or CH.sub.3 ;
- R.sup.6 is an alkyl group with 1-5 carbon atoms;
- M.sup.1 and M.sup.2 are each alkali metal, alkali earth metal or organic amine;
- X is CH.sub.2 CH.sub.2 O, CH.sub.2 CH(CH.sub.3)O or CH.sub.2 ;
- Y is a polymer block obtained by radical polymerization of .alpha., .beta.-ethylenically unsaturated monomers having an amide group in the molecule;
- m is 0 or an integer 1-10;
- and n is 0 or an integer 1-50.
Dependencies are inferred from the claim text.