Coating compositions with good storage stability and coatings with high scratch resistance of the at the same time good weathering stability

摘要

The present invention relates to coating compositions containing(A) at least a hydroxyl-containing polyacrylate and / or polymethacrylate and / or polyurethane and / or polyester and / or polysiloxane and(B) at least one compound (b) having blocked isocyanate groups and with alkoxysilane groups,characterized in that(i) the hydroxyl groups of component (a) with at least one acyclic ortho esters are blocked,(ii) the compound (b) at least one structural unit (ii) comprises-N (x - sir"_x(Or)_{3 - x})_n(X '- sir"_y(Or)_{3 - y})_m (Ii),whereinR = hydrogen, cycloalkyl radical or an alkyl group,X, x '= linear and / or branched alkylene or cyclo alkylene radical having 1 to 20 carbon atoms,R "= alkyl, cycloalkyl, aryl, or aralkyl,n, m, x, y = 0 to 2, as well as m + n = 2 is,and(iii) at least 90 mol -% of the alkoxysilane groups ethoxy silane groups are.The present invention also relates to multi-stage coating process using these coating compositions as well as the use of the coating compositions as a clear varnish or application of the coating process for the automotive oem finishing and the coating of automobile - add-on parts.