COATING AGENT AND COATINGS PRODUCED THEREFROM HAVING HIGH SCRATCH RESISTANCE WHILE YIELDING GOOD RESULTS IN THE ERICHSEN DEPTH TEST AND HAVING GOOD STONE CHIPPING RESISTANCE PROPERTIES.

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.