Derivatized polycarboxylate dispersants

US6310143A · kind A · utility

Assignee

• MBT Holding AG · CH

Inventors

• Thomas M. Vickers, Jr. · Powell, US
• Rainer Packe-Wirth · Trostberg, DE
• Jeffrey R. Bury · Macedonia, US
• Jesse Osborne · Garfield Heights, US
• Runhai Lu · Vernon Hills, US
• John Moreau · Macedonia, US
• Lynn E. Brower · Solon, US
• Samy M. Shendy · Cuyahoga Falls, US
• John Pickett · Kimpton, GB

Key dates

• Filing date: Dec 16, 1998
• Grant date: Oct 30, 2001
• Expiry date: Dec 16, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/932
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention is directed to derivatized polycarboxylate dispersants for cementitious mixtures, including those mixtures with high percentages of pozzolan cement replacement and dry cast applications. In particular, the invention is directed to a cementitious mixture comprising cement, including cements with high percentages of pozzolan cement replacement, water, coarse aggregate, fine aggregate, and including a dispersant, wherein said dispersant is a derivatized polycarboxylate dispersant, or combination of polycarboxylate dispersants, which is a derivatized polymer comprising a backbone having moieties derived from (a) an unsaturated hydrocarbon; (b) at least one of a substituted carboxylic acid monomer, a substituted ethylenically unsaturated monomer, and maleic anhydride; and (c) optionally including an N-polyoxyalkylene succinimide; and wherein derivative moieties are pendant to the backbone monomer by at least one ester linkage and at least one amide linkage. The derivatized polycarboxylate dispersant provides for a longer shelf life dispersant, improved dispersability of cementitious mixtures, water reduction in cementitious mixtures, and is an effective dispersant …