Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1989-01-17
1990-10-09
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526287, C08F22802
Patent
active
049621734
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.
REFERENCES:
patent: 4434257 (1984-02-01), Narisawa
patent: 4808641 (1989-02-01), Yagi
Kinoshita Mitsuo
Shimono Toshihide
Yamaguchi Shozo
Yamamoto Tsuneo
Henderson Christopher
Takemoto Yushi Kabushiki Kaisha
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