Cement additive

US7482405B2 · kind B2 · utility

Assignee

• CONSTRUCTION RESEARCH & TECHNOLOGY GMBH · DE

Inventors

• Toshimi Matsumoto · Chigasaki, JP
• Sven Asmus · Shanghai, CN
• Gerhard Albrecht · Prien am Chiemsee, DE
• Klaus Lorenz · Zangberg, DE
• Petra Wagner · Trostberg, DE
• Christian Scholz · Neustadt an der Weinstraße, DE

Key dates

• Filing date: Mar 5, 2004
• Grant date: Jan 27, 2009
• Expiry date: Mar 5, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/34
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention concerns a cement additive containing copolymers comprising one or more constitutional units represented by formula A: (A) R1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 1 to 4 carbon atoms or an aryl group having 6 to 9 carbon atoms; R2 is hydrogen or an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms or an aryl group having 6 to 9 carbon atoms; T is alkylene (including straight-chain and branched alkylene) having 1 to 4 carbon atoms or arylene having 6 to 9 carbon atoms; n is 0 or 1; S1 and S2 are, independently of one another, —OCkH2k— or —OCH2CHR3—, with the proviso that k is 2 or 3, R3 is an alkyl group having 1 to 9 carbon atoms, an aryl group having 6 to 9 carbon atoms; and 6<_m1+m2<_25.