Construction Research & Technology Gmbh

Basf Se Corporation

Evonik Degussa Gmbh

Goldschmidt Gmbh

Degussa Construction Chemicals Gmbh

Harald Grassl

Alexander Kraus

Gerhard Albrecht

Torben Gädt

Luc Nicoleau

Kerstin Becher

Torben Gadt

Martin Winklbauer

Angelika Hartl

Philipp Wieland

Alfred Kern

Joachim Dengler

Jochen Mezger

Torben Gaedt

Christian Hübsch

Stefanie Scheul

Helmut Mack

Michael Schinabeck

Klaus Lorenz

Christian Scholz

Petra Wagner

Barbara Wimmer

Mario Vierle

Frank Dierschke

Sophie Putzien

Silke Flakus

Maxim Pulkin

Oliver Mazanec

Hubert Leitner

Ulrich Fischer

Alfons Smeets

Eva Jetzlsperger

Nina Susanne Hillesheim

Michael Dietzsch

Martina Brandl

Thomas Schuhbeck

Christian Huebsch

Fabian Becker

Iris Loescher

Karin Groess

Antonia Grafetstetter

Alexander Schoebel

Christian H&uuml;bsch

Julien Bizzozero

The present invention relates to an additive for hydraulically setting compositions comprising a colloidally disperse preparation comprising at least one salt of a polyvalent metal cation with at least one organic phosphonate and/or phosphate compound as anion and at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains. The additive is especially suitable as slump retainer and for improving early strength.

Additive for hydraulically setting compositions

A set control composition for cementitious systems comprises (a) an amine-glyoxylic acid condensate, and (b) at least one of (i) a borate source and (ii) a carbonate source. The carbonate source is selected from inorganic carbonates having an aqueous solubility of 0.1 gLor more, and organic carbonates. The set control composition improves workability of cementitious systems for prolonged periods of time without compromising early compressive strength. Due to the retarding action of the set control composition, the dosage of dispersant(s) necessary to obtain a desired flowability of the cementitious system can be reduced.

Set control composition for cementitious systems

The invention relates to a process for modifying polymer particles of an aqueous polymer dispersion in which positively or negatively charged polymer particles are provided with an inorganic salt shell. The inorganic shell leads to an improved drying ability and storage stability of the latex and improves the storage stability of the resulting polymer powder. The obtained polymer powder exhibits an improved viscosity and faster skin-forming time in the final application and is therefore particularly useful in a building material composition.

Process for modifying polymer particles of an aqueous polymer dispersion, an aqueous polymer dispersion obtainable by said process, a redispersible polymer powder, and a composition comprising the redispersible polymer powder

The invention relates to a dispersant comprising a polymer obtainable by copolymerization of monomers including 5 to 80 mol % of a hydroxyalkyl acrylate phosphate and/or hydroxyalkylacrylamide phosphate (monomer 1), 0 to 20 mol % of a di(hydroxyalkyl acrylate) phosphate and/or di(hydroxyalkylacrylamide) phosphate (monomer 2) and 1 to 80 mol % of a polyalkylene glycol-containing macromonomer comprising an alkene group (monomer 3). Further disclosed is a process for preparing the polymers of the invention and the use thereof as dispersants in calcium sulphate-containing compositions. A further aspect of the invention is a process for producing shaped gypsum bodies, and also shaped gypsum bodies, more particularly gypsum plasterboards and self-levelling screeds, comprising the dispersant of the invention.

Polymeric dispersant

The present invention relates to an additive for hydraulically setting compositions, comprising a colloidally disperse preparation of at least one salt of a mono- or polyvalent metal cation and of at least one compound which is able to release an anion which forms a low-solubility salt with the metal cation, and of at least one polymeric sulphonated dispersant. The additive is suitable particularly as a slump retainer.

The present invention relates to an additive for hydraulically setting compositions, comprising a colloidally disperse preparation of at least one water-soluble salt of a polyvalent metal cation, at least one compound capable of releasing an anion which forms a sparingly soluble salt with the polyvalent metal cation, and at least one polymeric dispersant which comprises anionic and/or anionogenic groups and polyether side chains.

Additive for hydraulically setting compounds

The invention concerns a process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound, said reaction being carried out in the presence of an aqueous solution which contains a water-soluble comb polymer suitable as a plasticizer for hydraulic binders, wherein the water-soluble comb polymer is present as a copolymer which is produced by free radical polymerization in the presence of a phosphorylated monomer and a (meth)acrylic acid ester based polyether macromonomer.

Hardening accelerator composition

The present invention relates to an additive for hydraulically setting compositions, comprising an aqueous, colloidally disperse preparation of at least one salt of a polyvalent metal cation and of at least one polymeric dispersant which comprises anionic and/or anionogenic groups and polyether side chains. The additive is suitable particularly as a slump retainer.

The invention relates to a process for the preparation of a phosphated polycondensate, at least one sulphonic acid being used as catalyst, and to the use of the phosphated polycondensate obtained as an admixture for aqueous suspensions of hydraulic and/or latently hydraulic binders.

Method for producing phosphated polycondensation products and the use thereof

Dispersion which is free of binders and which contains silica and at least one superplasticizer, the silica being a precipitated silica having a surface area greater than 50 m/g, the aggregates and/or agglomerates in the dispersion having a median diameter of less than 1 &#x3bc;m and the proportion of silica being from 5 to 50% by weight, based on the total amount of the dispersion, and a process for the preparation thereof and the use thereof as a concrete admixture in cement-containing preparations.

Aqueous dispersions of silica for increasing early strength in cementitious preparations

A process for the preparation of a copolymer in semicontinuous operation in a polymerization apparatus, comprising a polymerization reactor connected to a metering device, acid monomer being initially taken in the metering device and polyether macromonomer, acid monomer and water in the polymerization reactor, acid monomer being metered from the metering device into the polymerization reactor, the metering of the acid monomer being effected with the proviso that at least 70 mol % of the acid monomer metered in altogether are metered in the course of 5 to 19 minutes at a metering rate that is constant or varies to a limited extent.

Semi continuously operated method for producing copolymers

The invention relates to a process for the preparation of polymers by free radical polymerization of monomers in the presence of water, electrochemically produced free radicals being used for initiating the free radical polymerization.

Method for initiating radical polymerizations

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 invention relates to a process for the preparation of a copolymer by free radical mass polymerization of a maleic acid monoester derivative with vinyl ester in the presence of an acid having a pKa of less than 1.8. The copolymer is suitable as a dispersant for hydraulic binders.

Vinyl ester maleic acid derivative copolymers

Pulverulent polycondensation products are described, consisting of The pulverulent polycondensation products according to the invention are outstandingly suitable in construction material mixtures in an amount of from 0.1 to 5% by weight, based on the weight of the construction material. The pulverulent polycondensation products have a number of advantages here, such as, for example, excellent storage stability, good liquefying action at low dosage and industrially simple production.

Pulverulent polycondensation products

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Feichten an der Alz, Germany

Harald Grassl