Beschichtungsmittel auf Basis eines hydroxylgruppenhaltigen Polyacrylatharzes und seine Verwendung in Verfahren zur Herstellung einer Mehrschichtlackierung

摘要

The subject matter of the present invention is a coating agent which is characterized in that the binder component is obtained by polymerising: (a) 10 to 51 wt % of a mixture of: (a1) 4-hydroxy-n-butyl(methacrylate) and/or 3-hydroxy-n-butyl(meth)acrylate and (a2) 3-hydroxy-n-propyl(meth)acrylate and/or 2-hydroxy-n-propyl(meth)acrylate; (b) 0 to 20 wt % of at least one further monomer containing hydroxyl groups; (c) 28 to 85 wt % of at least one (cyclo)aliphatic (meth)acrylic acid ester; (d) 0 to 25 wt % of at least one vinyl aromatic; (e) 0 to 5 wt % of at least one unsaturated carboxylic acid; and (f) 0 to 20 wt % of further monomers, to form a polyacrylate resin having a hyroxyl number from 60 to 200, an acid number from 0 to 35 and an Mn of 1000 to 5000. The cross-linking component is a mixture of a polyisocyanate having an average functionality of 3 to 4 and an uretdione group content of