Hydrophobic, functionalized particles

A stable mixture comprising surface-modified particles which are obtained by reacting metal oxide or semimetal oxide particles with at least one compound of the general formula (I)

• R1n—Si(OR2)4-n (I)
• where R1, R2 and n have the following meanings:
• R1 are each, independently of one another, hydrogen, linear or branched, optionally functionalized C1-C30-alkyl, linear or branched, optionally functionalized C2-C30-alkenyl, linear or branched, optionally functionalized C2-C30-alkynyl, optionally functionalized C3-C20-cycloalkyl, optionally functionalized C3-C20-cycloalkenyl, optionally functionalized C1-C20-heteroalkyl, optionally functionalized C5-C22-aryl, optionally functionalized C6-C23-alkylaryl, optionally functionalized C6-C23-arylalkyl, optionally functionalized C5-C22-heteroaryl,
• R2 are each, independently of one another, hydrogen, linear or branched, optionally functionalized C1-C30-alkyl, linear or branched, optionally functionalized C2-C20-alkenyl, linear or branched, optionally functionalized C2-C20-alkynyl, optionally functionalized C3-C20-cycloalkyl, optionally functionalized C3-C20-cycloalkenyl, optionally functionalized C1-C20-heteroalkyl, optionally functionalized C5-C22-aryl, optionally functionalized C6-C23-alkylaryl, optionally functionalized C6-C23-arylalkyl, optionally functionalized C5-C22-heteroaryl
• and/or
• group of the general formula (IIa)
• —SiR1m(OR2)3-m (IIa)
• where R1 and R2 independently of one another have the above-mentioned meanings and m is independently of one another 0, 1, 2 or 3,
• n 1, 2 or 3,
• and at least one solvent, at least one surface-active substance or a mixture thereof.