The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1990
Filed:
Jan. 17, 1989
Mitsuo Kinoshita, Aichi, JP;
Toshihide Shimono, Aichi, JP;
Shozo Yamaguchi, Aichi, JP;
Tsuneo Yamamoto, Aichi, JP;
Takemoto Yushi Kabushiki Kaisha, Aichi, JP;
Abstract
A cement dispersion agent contains a water-soluble vinyl copolymer having numerical average molecular weight of 2000-15000 which is obtainable by copolymerization of at least three kinds of monomers shown by Formulas A, B and C given below at copolymerization ratio of 10-50/3-25/80-40 by weight: ##STR1## where R.sup.1, R.sup.2, and R.sup.3 are H or CH.sub.3, R.sup.4 is alkyl group with 1-3 carbon atoms, M.sup.1 and M.sup.2 are alkali metal, alkali earth metal, ammonium or organic amine, and n is an integer in the range 5-25. Such a dispersion agent is produced by aqueous solution polymerization of monomers of these kinds at a weight ratio within the range given above in the presence of a radical polymerization initiating agent. Fluidizing property can be provided to a hydraulic cement composition like concrete, cement paste and mortar by adding an agent of this invention by 0.01-0.2 wt % by solid cement component.