Wacker Chemie Ag

Wacker Polymer Systems Gmbh & Co. Kg

Marion Killat

Abdulmajid Hashemzadeh

Stefan Killat

Peter Fritze

The invention relates to water-redispersible dispersion powder compositions based on polymers of one or more ethylenically unsaturated monomers, wherein one or more gemini surfactants are present.

Dispersion powder compositions comprising gemini surfactants

The invention relates to silane modified additives obtained by condensation of one or a plurality of silanes of the general formula (RO)RSi(RX)(1), wherein R is an optionally substituted alkyle, aryle or alkoxyalkyl radical with 1 to 10 carbon atoms or hydrogen, Ran optionally substituted hydrocarbon radical with 1 to 12 carbon atoms or hydrogen, Ran optionally substituted alkylene radical with 1 to 20 carbon atoms, wherein methylene units that are not adjacent to one another can be substituted by groups &#x2014;O&#x2014;, and X is bound to Rvia a covalent bond and stands for an amino radical NHR, an epoxy radical CR(O)CRR, an urethane radical NR&#x2014;C(&#x2550;O)OR, an urea radical NR&#x2014;C(&#x2550;O)NRR, a phosphorous acid radical P(&#x2550;O)(OH), an anhydride radical C(&#x2550;O)O(O&#x2550;)CRor a carbon acid radical, wherein Ris hydrogen or an optionally substituted alkyle, aryle or amino alkyle radical with 1 to 10 carbon atoms, R, R, Rhydrogen or an optionally substituted alkyle or aryle radical with 1 to 10 carbon atoms, wherein the respective radicals R, R, R, R, Rand Reach obtain their values independently from each other, and n takes on the value 0, 1, 2, or 3, in an aqueous solvent by mixing with one or a plurality of water solvent polymers, wherein the content of water soluble polymers is &#x2267;15 wt. %, based on the dry weight of the silane modified additives, and optionally drying of the thus obtained aqueous mixture.

Silane-modified additives and silane-modified polymer compounds

Water-redispersible polymer powder compositions are obtained by means of free-radical-initiated polymerization in aqueous medium of one or more monomers 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 and subsequent drying of the polymer dispersion, wherein one or more silanes of the general formula (RO)RSiRX (1) where X is an amino- or epoxy-containing radical are added before drying of the polymer dispersion. The powders are especially useful in tile adhesives for tiles having low water absorbtion capacity.

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Burghausen, Germany

Marion Killat