Highly efficient cement dispersants

US6136950A · kind A · utility

Assignee

• MBT Holding AG · CH

Inventors

• Thomas M. Vickers, Jr. · Powell, US
• Runhai Lu · Vernon Hills, US
• Lynn E. Brower · Solon, US
• Samy M. Shendy · Cuyahoga Falls, US
• Rainer Packe-Wirth · Trostberg, DE
• Hong P. Gao · Austin, US

Key dates

• Filing date: Sep 23, 1997
• Grant date: Oct 24, 2000
• Expiry date: Sep 23, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/408
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention is directed to a polymer dispersant comprising a substituted polyimide or polyamide backbone, having at least some proportion of oligomeric or polymeric grafted side chains including one of amides, esters, and thioesters, having the general formula: wherein X is at least one of hydrogen, an alkali earth metal ion, an alkaline earth metal ion, ammonium ion, and amine; R is at least one of C.sub.1 to C.sub.6 alkyl(ene) ether and mixtures thereof and C.sub.1 to C.sub.6 alkyl(ene) imine and mixtures thereof; Q is 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; R.sub.1 is at least one of hydrogen, C.sub.1 to C.sub.20 hydrocarbon, and functionalized hydrocarbon containing at 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 each independently 0 or an integer between 1 and about 20; Z is a moiety containing at least one of i) a compound containing at least one amine and one acid group, ii) two functio…