Coating compositions and coatings produced therefrom with improved soiling resistance and (self-)cleaning properties and use thereof

A nonaqueous coating composition comprising:

• (A) at least one hydroxyl group-containing compound (A) having a hydroxyl number of 100 to 400 mg KOH/g and a Tg>−35° C., which is present at not less than 25 wt %, based on the binder fraction of the coating composition,
• (B) at least one isocyanate group-containing compound (B) having free or blocked isocyanate groups, compound (B) comprising at least one structural unit of the formula (I)
• —NR—(X—SiR″x(OR′)3-x) (I),
• and/or at least one structural unit of the formula (II),
• —N(X—SiR″x(OR′)3-x)n(X′—SiR″y(OR′)3-y)m (II),
• where
• R=hydrogen, alkyl, cycloalkyl, aryl, or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur, or NRa groups, with Ra=alkyl, cycloalkyl, aryl, or aralkyl,
• R′=hydrogen, alkyl, or cycloalkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur, or NRa groups,
• X, X′=linear and/or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms,
• R”=alkyl, cycloalkyl, aryl, or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur, or NRa groups,
• n=0 to 2, m=0 to 2, m+n=2, and x, y=0 to 2,
• and
• (C) at least one catalyst (C) for the crosslinking of silane groups,
• wherein additionally there is
• (D) at least one alkoxysilyl-functional siloxane of the formula (III)
• R1—SiR22-Ax-By—O—SiR32—R4 (III)
• in which
• A is a group —[O—SiR52]— and B is a group —[O—SiR6R7]—,
• R2, R3, R5, and R6 independently of one another are linear or branched alkyl groups having 1 to 4 carbon atoms,
• R1, R4, and R7 independently of one another are a group -L-R8,
• in which L=a linear or branched divalent alkyl group and
• R8=H or —Si(R9)z(OR10)3-z with R9, R10=a linear or branched alkyl group having 1-4 carbon atoms and z=0, 1, or 2,
• with the proviso that at least one of the radicals R1 or R4 and/or at least one group B constitutes a group R8=—Si(R9)z(OR10)3-z,
• x independently is an integer of 1-20,
• y independently is an integer of 0-10.