Importance

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Abstract

Partly hydrophobic metal oxides are prepared by silylating a metal oxide with

I) an organosilane of the formulaR1nSiX4-n where n is 1, 2 or 3or mixtures of these organosilanes, R1 each being an identical or different monovalent, optionally halogenated hydrocarbon radical having 1 to 24 carbon atoms, and being saturated, aromatic, monounsaturated, or polyunsaturation,X being halogen, a nitrogen-containing radical, OR2, OCOR2, O(CH2)xOR2,R2 being hydrogen or a monovalent hydrocarbon radical having 1 to 12 carbon atoms,x being 1, 2 or 3;or II) an organosiloxane composed of units of the formula(R13SiO1/2), and/or(R12SiO2/2), and/or(R1SiO3/2),the number of R1 units in one organosiloxane being at least 2; I and II used individually or in any desired mixture in a total amount of from 0.015 mmol/g to 0.15 mmol/g per 100 m2/g of metal oxide BET surface area.

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First Claim