| 摘要 |
The present invention relates to coating compositions comprising (A) at least one hydroxyl-containing polyacrylate and/or at least one hydroxyl-containing polymethacrylate and (B) at least one compound (B) containing isocyanate groups and having at least one structural unit (I) of the formula (I)—NR—(X—SiR″x(OR′)3-x) (I), and having at least one structural unit (II) of the formula (II)—N(X—SiR″x(OR′)3-x)n(X′—SiR″y(OR′)3-y)m (II), where (i) the hydroxyl-containing polyacrylate and/or the hydroxyl-containing polymethacrylate have/has a glass transition temperature of less than 10° C., (ii) the compound (B) containing isocyanate groups contains more than 10 mol % to 90 mol % of at least one structural unit of the formula (I) and 10 to less than 90 mol % of at least one structural unit of the formula (II), based in each case on the entirety of the structural units (I) and (II), and (iii) 10 to 60 mol % of the isocyanate groups of the diisocyanate and/or polyisocyanate parent structure of the compound (B) have been reacted to form the structural units of the formulae (I) and (II). The present invention additionally provides multistage coating processes using these coating compositions, and also the use of the coating compositions as clearcoat or application of the coating process for automotive OEM finishing, the finishing of surface-mounted automotive components, and automotive refinish.
|
