Construction Research & Technology Gmbh

Toshimi Matsumoto

Gerhard Albrecht

Klaus Lorenz

Christian Scholz

Petra Wagner

Viswanath Mahadevan

Minoru Yaguchi

Fang Hua Lei

Sven Asmus

Kenichi Umezawa

A dispersant composition includes a) at least one polymer constituted of monomers having naphthalene ring and/or melamine; b). at least one polymer having carboxylic acid and/or phosphoric acid group and/or any group that is hydrolyzed into carboxylic or phosphoric; and c). at least one polymer having a structure of Formula I: Ris hydrogen or alky group having carbon number not less than 1, cycloalkyl or cycloalkenyl group having carbon number not less than 3, alkenyl group having carbon number not less than 2, aryl group having carbon number not less than 6; Ris hydrogen or alky group having carbon number from 1 to 3; A is alkylene group having carbon number from 3 or 4; m and n are positive numbers wherein m is more than n and the sum of m and n is more than 9 and less than 12. Also provided is a method of using the dispersant composition in a mortar or concrete, and the weight percentage of the dispersant composition is from 0.01% to 2.5% based on the weight of cement in mortar. Further provided is an aqueous composition including the dispersant composition.

Dispersant composition

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.

Cement additive

Growing community of inventors

Kanagawa, Japan

Toshimi Matsumoto