Th. Goldschmidt Ag

Herbert Giesing

Christian Weitemeyer

Gotz Koerner

Eckehard Schamberg

Harald Rau

Hans-Jurgen Patzke

Herbert Quilitsch

Fritz Spieker

Jakob Wassermeyer

Vaclay Kropac

Method for impregnating mineral building materials, with aqueous solutions of silanols and/or siloxanols is disclosed. The solution is obtained by continuous hydrolysis of alkoxysilanes and/or alkoxysiloxanes, of the general formula ##EQU1## wherein R.sup.1 =alkyl with 1 to 8 carbon atoms, at least 90% of the R.sup.1 groups in the average molecule being alkyl groups with 1 to 4 carbon atoms,

Method for impregnating mineral building materials

A continuous process for the preparation of alkoxypolysiloxane in which silane or a silane mixture and a mixture of hydrogen chloride-containing alcohol and water is fed continuously into the lower region of preferably cylindrical stirred reactor, the reaction product formed together with excess hydrogen chloride-containing alcohol is drawn off continuously after residence time of 30 to 180 minutes at the upper end of the reactor and the undissolved, gaseous portion of hydrogen chloride is carried off at the head of the reactor, the temperature of the reaction mixture or the reaction product, as it flows through the reactor, being raised from a range of -17.degree. to +30.degree. C. to range of +30.degree. to +80.degree. C., the temperature gradient having to be at least 10.degree. C., and the excess alcohol and dissolved hydrogen chloride being removed outside of the reactor in a known manner from the reaction product formed, and the hydrogen chloride-containing alcohol obtained while working up to reaction product being recycled to the reactor. The invention furthermore relates to an apparatus which is particularly suitable for implementing the process.

Process and apparatus for continuously synthesizing alkoxypolysiloxanes

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Essen, Germany

Herbert Giesing