Organosilicon Hydrophobing Agents

A process for rendering a construction material more hydrophobic, wherein at least one surface of the construction material is treated with an oil-in-water emulsion comprising an organosilane having the formula

• where R is an alkyl or cycloalkyl group having 4 to 30 carbon atoms comprising or alternatively consisting of an alkyl chain of 4 or more carbon atoms or an aryl or aralkyl group comprising or a benzene ring, and R′ and R″ each represent hydrogen or an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms or a phenyl group.

(canceled)

An oil-in-water emulsion characterised in that the disperse oil phase is an organosilane of the formula

• where R is an alkyl or cycloalkyl group having 4 to 30 carbon atoms comprising or alternatively consisting of an alkyl chain of 4 or more carbon atoms or an aryl or aralkyl group comprising a benzene ring, and R′ and R″ each represent hydrogen or an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms or a phenyl group.

(canceled)

(canceled)

An oil-in-water hydrophobing agent for a construction material or a textile material or a particulate filler comprising an organosilane having the formula

• where R is an alkyl or cycloalkyl group having 4 to 30 carbon atoms comprising or alternatively consisting of an alkyl chain of 4 or more carbon atoms or an aryl or aralkyl group comprising a benzene ring, and R′ and R″ each represent hydrogen or an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms or a phenyl group.