Construction Research & Technology Gmbh

Sven Asmus

Gerhard Albrecht

Klaus Lorenz

Christian Scholz

Petra Wagner

Toshimi Matsumoto

The present invention concerns a cement additive containing copolymers comprising one or more constitutional units represented by formula A: (A) Ris 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; Sand Sare, independently of one another, &#x2014;OCH&#x2014; or &#x2014;OCHCHR&#x2014;, 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&#x3c;_m+m&#x3c;_25.

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Shanghai, China

Sven Asmus