Lignosulfonic graft copolymer as a cement dispersant

Details Lignosulfonic graft copolymer as a cement dispersant Lignosulfonic graft copolymer as a cement dispersant

1988-11-28

1990-12-11

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From lignin, tannin, or derivative reactant

523131, 106823, C08H 502, C09K 700, C09D 400

Patent

active

049772279

ABSTRACT:
This invention provides a cement dispersant of a lignosulfonic acid graft copolymer, obtained by a redox free radical reaction of lignosulfonic acid or its salts with one or more acrylic or vinylic monomers containing functional groups, in an aqueous solution in the presence of a radical initiator, e.g, redox catalyst. The lignosulfonic acid graft copolymer has a molecular weight distribution of from 5.times.10.sup.2 to 5.times.10.sup.6.

REFERENCES:
patent: 3784493 (1974-01-01), Giguere et al.
patent: 4276077 (1981-07-01), Zaslavsky et al.
patent: 4387205 (1983-07-01), Zaslavsky et al.

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