Wacker Chemie Ag

Wacker-chemie Gmbh

Wacker Polymer Systems Gmbh & Co. Kg

Peter Fritze

Hans-Peter Weitzel

Hermann Lutz

Theo Mayer

Harald Zeh

Stefan Killat

Ulf Dietrich

Klas Sorger

Jürgen Bezler

Marion Killat

Wolfgang Hagen

Reinold H&auml;rzschel

Open time and creep resistance of hydraulically settable inorganic construction materials such as mortars and tile adhesives are both improved at the same time by the addition of a polymer mixture in the form of an aqueous dispersion or water-redispersible powder, containing one or more protective colloid-stabilized polymers having units derived from 20% to 30% by weight of vinyl chloride, 50% to 75% by weight of vinyl acetate, 5% to 20% by weight of ethylene, and one or more protective colloid-stabilized, vinyl halide-free polymers of one or more ethylenically unsaturated monomers.

Polymer blends in the form of aqueous dispersions or powders that can be redispersed in water

The invention relates to gypsum-containing construction material compounds, containing gypsum, if necessary one or more polymers, if necessary one or more aggregates, and if necessary one or more additives, characterised in that the gypsum-containing construction material compounds contain one or more types of cement and one or more types of pozzolana.

Gypsum-containing construction material compounds

Hydrophobicizing additives are water-redispersible powders or aqueous dispersions containing:

Hydrophobicizing additives

Water-redispersible polymer powder compositions based on a) homo- or copolymers of one or more monomers from the group consisting of vinyl esters of unbranched or branched Calkylcarboxylic acids methacrylic esters and acrylic esters of Calcohols, vinylaromatics, olefins, dienes, and vinyl halides, with one or more protective colloids, and optionally, one or more antiblocking agents, in conjunction with one or more alkali metal or alkaline earth metal Ccarboxylates as setting accelerants added following polymerization accelerate the setting of construction chemistry products with hydraulically setting binders.

Use of redispersion powder compositions with accelerated-setting action

Water-redispersible polymer powder compositions based on homopolymers or copolymers of one or more monomers from the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic esters and acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and vinyl halides, one or more protective colloids, if desired antiblocking agents, contain one or more compounds from the group of pozzolanas. The pozzolanic compounds preferably take the place of anti-blocking agents conventionally used.

Redispersible powders comprising pozzolanic components

The vinyl aromatic-1,3-diene copolymers stabilized with protection colloids are used in the form of aqueous polymer dispersions or water-redispersible polymer powders for modifying materials that contain plaster or calcium carbonate. The polymer dispersions or polymer powders are obtained by the emulsion-polymerization of a mixture containing at least one vinyl aromatic and at least one 1,3-diene in the presence of at least one protection colloid and without any emulsifier, and by optionally drying the aqueous polymer dispersions thus obtained.

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Haiming, Germany

Peter Fritze