Construction Research & Technology Gmbh

Goldschmidt Gmbh

Basf Se Corporation

Evonik Degussa Gmbh

Christian Hübsch

Bernd Bruchmann

Gerhard Albrecht

Alexander Kraus

Harald Grassl

Angelika Hartl

Alfred Kern

Hans-Joachim Hähnle

Robert Feuerhake

Ulrich Fischer

Paola Uribe Arocha

Kerstin Becher

Stefanie Scheul

Daniel Schönfelder

Ralph Baumgärtner

Statistic comb polymers obtainable by the radical copolymerization of a vinylic poly(alkylenoxide) compound (A) with an ethylenically unsaturated monomer compound (B) according to the catalytic chain transfer method (CCT). The comb polymers are extremely suitable for hydraulic binder suspensions based on cement, lime, gypsum and anhydrite as they have, for the same dosage, an improved water reducing power over conventional flow agents. The corresponding building material mixtures are characterized by a substantially reduced stickiness and plastic viscosity once said comb polymers are added, which dramatically improves the plasticity of very cement-rich building material mixtures, such as concretes. The building material mixtures using the inventive flow agents have a considerably increased slump flow and an increased shear-thinning behavior as compared to conventional concretes without the tendency to segregate.

Statistic comb polymers, method for producing the same and their use

The use of block copolymers which were prepared by polymerization of a poly(alkylene oxide) compound (A) with at least one ethylenically unsaturated monomer compound (B), as dispersants for aqueous suspensions of solids, in particular based on hydraulic binders, such as, for example, cement, lime, gypsum or anhydrite, is described. Surprisingly, these block copolymers have a substantially better water-reducing power at the same dose in comparison with conventional superplasticizers based on comb polymers. Moreover, the slump loss can also be reduced in comparison with conventional superplasticizers by modification of the adhesive block.

Use of block copolymers as dispersants for aqueous suspensions of solids

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Gmund, Germany

Christian Hübsch