Wacker-chemie Gmbh

Wacker Chemie Ag

Hardy Herold

Herbert Eck

Abdulmajid Hashemzadeh

Heinrich Hopf

Walter Dobler

Joachim Schulze

Anke Reinschmidt

Rita Kellermann

Gary P Fischer

Hendrikus Mosseveld

Peter Brandmueller

Roland Schickor

Kenneth Kempinski

Juergen Hinterwinkler

Water-redispersible polymer powders with improved characteristics in building materials are prepared using a drying aid which is a polyvinyl alcohol copolymer also containing vinyl ester monomers and specific comonomers.

Dispersion powder composition containing vinyl alcohol copolymerisate

The invention relates to coating agents based on one or more mineral binders, one or more polymers, one or more fillers, and optionally one or more additives. The invention is characterized in that the coating agents contain 0.05 to 5 wt. %, with respect to the dry weight of the coating agents, of one or more flexibilizers selected from the group comprising hydroxy compounds with 1 to 25 carbon atoms, carboxylic acid compounds with 1 to 25 carbon atoms or the salts thereof, hydroxy carboxylic acid compounds with 1 to 25 carbon atoms or the salts thereof, phosphonic acids or the salts thereof, and phosphoric acids or the salts thereof, and at least 55 wt % polymers, with respect to the dry weight of the polymers and the mineral binders.

Coating agents for producing permanently flexible coatings

The invention provides for the use of coating compositions based on one or more mineral binders, one or more polymers, one or more fillers, and, if desired, one or more additives for producing roof coatings, the coating compositions comprising at least 50% by weight of polymers, based on the dry weight of the polymers and of the mineral binders.

Flexible watertight roof coatings

The invention relates to jointing compounds which are based on vinyl ester-ethylene copolymers or on acrylate polymers in the form of their aqueous dispersions or of water-redispersible powders with, if desired, other additives, such as fillers, plasticizers, thickeners, dispersants, antifoams, preservatives, pigments and water, wherein the jointing compounds contain from 0.01 to 1.0% by weight, based on the total weight of the jointing compound, of alkylalkoxysilanes of the general formula SiR,(OR&prime;),, where n is from 1 to 3, R&prime; represents identical or different alkyl radicals or monoalkyl glycol radicals having from 1 to 8 carbon atoms and R represents identical or different alkyl radicals having from 1 to 8 carbon atoms which may, if desired, be substituted with a halogen such as chlorine, or with ether, ester, amide, hydroxyl, amino, carboxyl, epoxy, carboxylic anhydride or carbonyl groups.

Jointing compounds with improved resilience

A process for the preparation of water-redispersible dispersion powder compositions which are modified with additives and are based on polymers of ethylenically unsaturated compounds, includes drying the corresponding aqueous polymer dispersion and applying additives, which are liquid at a temperature of .ltoreq.50.degree. C., to a pulverulent carrier material, and then adding the resulting powder during or after drying of said dispersion.

Process for the modification of dispersion powder compositions

The invention relates to a redispersible powder composition comprising

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Burghausen, Germany

Hardy Herold