Evonik Degussa Gmbh

Andrea Heuschen

Burkhard Standke

Christoph Batz-Sohn

Stefan Scharfe

Christian Wassmer

Heinz Lach

Markus Ruf

Christian Waβmer

Guenter Stein

Tobias Banert

Florian Zschunke

Juergen Behnisch

The invention relates to novel quaternary amino alcohol functional organosilicon compounds, aqueous compositions containing the latter, and a method for their production, in particular in the form of oligomers and polymers which can be present in the partially or fully hydrolyzed form and are in particular water-soluble. The compositions comprise only an extremely small portion of VOCs. The invention further relates to their use, preferably in the production of inkjet photographic papers.

Quaternary amino alcohol functional organosilicon compounds, composition containing the latter and their production and use

Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m/g and 100 to 300 &#x3bc;g of cationizing agent per square meter of the BET surface area of the silicon dioxide particles, wherein the cationizing agent is obtainable by reacting at least one haloalkyl-functional alkoxysilane, hydrolysis products, condensation products and/or mixtures thereof with at least one aminoalcohol and water; and optionally removing the resulting hydrolysis alcohol from the reaction mixture. Also the process for preparing the dispersion, wherein the cationizing agent comprises one or more quaternary, aminoalcohol-functional, organosilicon compounds of formula III and/or condensation products thereof, wherein Ru and Rv are independently Calkyl group, m is 2-5 and n is 2-5. 

Methods for producing a dispersion containing silicon dioxide particles and cationization agent

Dispersion obtainable by reacting a) in 50 to 75 parts by weight of water b) 25 to 50 parts by weight of silica particles having a BET surface area of 30 to 500 m/g and c) 100 to 300 &#x3bc;g/mBET surface area of the silica particles from b) parts by weight of one or more aminofunctional, organosilicon compounds, the aminofunctional, organosilicon compound being a quaternary, aminofunctional, organosilicon compound which is obtainable by reacting at least one haloalkylfunctional silane as component A with a tertiary amine as component B in the presence of a defined amount of water and at least partly removing the resulting hydrolysis alcohol from the system.

Dispersion containing silica particles surface-modified with quaternary, aminofunctional organosilicon compounds

The invention relates to stabilized dispersions of precipitated silicon dioxide, to a process for production thereof and to the use thereof, especially for production of paper coatings for glossy photo paper for inkjet printing.

Stable aqueous dispersions of precipitated silica

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Floersbachtal, Germany

Andrea Heuschen