Huels Aktiengesellschaft

Huls Aktiengesellschaft

Evonik Degussa Gmbh

Christine Fliedner

Friedhelm Schnippering

Burkhard Standke

Jaroslaw Monkiewicz

Michael Horn

Dietrich Maschmeyer

Roland Edelmann

Hans-Guenther Srebny

Albert Frings

Hans-Joachim Koetzsch

Reinhard Matthes

Gerhard Rehfeld

Michael Schottler

Thomas Roehrig

Reinhard Mattes

Karl-Martin Rodder, Deceased

Thomas Rohrig

Thomas Röhrig

An aqueous oil-in-water emulsion containing a propylethoxysilane oligomer mixture or a mixture of a propylethoxysilane oligomer mixture and octyltriethoxysilane in a weight ratio of 3:1 to 1:3, at least one emulsifier or an emulsifier system, at least one content of a 2-aminoethanol and water is used as an addition in the production of hydraulically setting cement mixtures such as mortar, screed or concrete for reduction of the shrinkage characteristics.

Use of aqueous emulsions based on propylethoxysilane oligomers as an additive in hydraulically setting cement compositions for reduction of shrinkage characteristics

Water-based organopolysiloxane-containing compositions which are essentially free from organic solvents, have a flashpoint above 80.degree. C., and essentially liberate no alcohols by hydrolysis on dilution with water are obtainable by mixing water-soluble aminoalkylalkoxysilanes with alkyltrialkoxysilanes and/or dialkyldialkoxysilanes and/or mixtures of alkyltrialkoxysilanes and dialkyldialkoxysilanes which are not water-soluble, adding water to the mixture, adjusting the pH of the reaction mixture to a value of between 1 and 8 and removing any alcohol already present and/or formed during the reaction. Such compositions are especially useful for hydrophobicizing the surface of building materials such as brick, concrete, lime sand brick, and mortar.

Water-based organic polysiloxane-containing compositions, processes for

A binder composition for storable zinc dust paints contains a mixture of silicic acid esters, solvents, curing agents, an antideposition agent, and a dearomatized aliphatic hydrocarbon mixture with an average molecular weight of 133. The binder composition has a flash point distinctly higher than 21.degree. C.

Binder for storable coating compositions

A binder composition for zinc dust paints contains silicic acid esters, solvents, curing agents, an anti-settling agent and n-butyl acetate. The composition has a flash point above 21.degree. C.

Binders for storage-stable coating compositions

The invention relates to polycrystalline, sintered abrasive granules based on .alpha.-Al.sub.2 O.sub.3 with a density of &gt;98% of the theoretical density of corundum, a Vickers hardness of 21 GPa and greater and a crystallite size of 0.05 to 1.3 micron, as well as abrasives made from these abrasive granules and the use of these abrasive granules for the production of ceramic, refractory products. The polycrystalline, sintered abrasive granules based on .alpha.-Al.sub.2 O.sub.3 are produced by .alpha.-Al.sub.2 O.sub.3 crystal nuclei being added to a boehmite dispersion, the mixture of the boehmite dispersion and the crystal nuclei being acidified and gelled and the gel being dried, crushed, and sintered. In doing so, 0.5 to 35% by weight of .alpha.-Al.sub.2 O.sub.3 crystal nuclei, relative to the sintered abrasive granules, is added and the mixture of the boehmite dispersion and of the crystal nuclei is refluxed, while the pH of the mixture is kept in a range of 2.5 to 3.5 by adding acid.

Polycrystalline, sintered abrasive granules based on .alpha.-Al.sub.2 O.sub

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Bonn, Germany

Christine Fliedner