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Abstract

A polymer dispersant useful for improving the fluidity of cementitious compositions comprises a substituted polyimide or polyamide backbone, having at least some proportion of oligomeric or polymeric grafted side chains includi ng one of amides, esters, and thioesters, having the general formula: wherein X is at least one of hydrogen, an alkali earth metal ion, an alkalin e earth metal ion, ammonium ion, and amine; R is at least one of C1 to C6 alkyl(ene) ether and mixtures thereof and C1 to C6 alkyl(ene) imine and mixtures thereof; Q i s at least one of oxygen, nitrogen, and sulfur; p is a number from 1 to about 300 resulting in at least one of a linear and branched side chain; R1 is at leas t one of hydrogen, C 1 to Co hydrocarbon, and functionalized hydrocarbon containing a t least one of -OH, -COOH, a derivative of -COOH, sulfonic acid, a derivative of sulfonic acid, amine, and epoxy; Y is a hydrophobic hydrocarbon or polyalkylene oxide moiety that functions as a defoamer; m, m', m' , n, n', and n' are eac h independently 0 or an integer between 1 and about 20; Z is a moiety containi ng at least one of i) a compound containing at least one amine and one acid group, ii) two functional groups capable of incorporating into the backbone selected fr om the group consisting of dianhydrides, dialdehydes, and di-acid chlorides, and ii i) a succinimide residue; and wherein a, b, c and d reflect the mole fraction of each unit wherein the sum of a, b, c and d equal one, wherein a, b, c and d are each a decimal of value greater than or equal to zero and less than one, and at lea st two of a, b, c and d are greater than zero.

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First Claim

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