| 摘要 |
The present invention relates to coating agents comprising (A) at least one polyacrylate comprising hydroxyl groups and/or at least one polymethacrylate comprising hydroxyl groups, and (B) at least one compound (B) comprising isocyanate groups having at least one structural unit (I) of the formula (I) -NR-(X-SiR"x(OR')3-x) (I), and 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), characterized in that (i) the polyacrylate comprising hydroxyl groups and/or the polymethacrylate comprising hydroxyl groups comprise a glass transition temperature of less than 10°C, (ii) the compound (B) comprising isocyanate groups comprises more than 10 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), each relative to the entirety of the structural units (I) and (II), and (iii) 10 to 60 mol % of the isocyanate groups of the di- and/or polyisocyanate base body of the compound (B), have been converted to the structural units of the formulas (I) and (II). The present invention further relates to a multistage coating method using said coating agent and to the use of the coating agent as a clear varnish, or to the use of the coating method for series painting of automobiles, painting of automobile accessories, and repair painting of automobiles. |
