Bindemiddelblanding, fremgangsmåte for dens fremstilling av dens anvendelse

摘要

Binder mixture for preparing solvent-free hard coatings,consisting of (A) a polyisocyanate component consisting of at least one organic polyisocyanate and (B) a solvent-free polyhydroxy component consisting of (B1) a hydroxy-functional polyacrylate component and (B2) one or more compounds containing ether groups and carrying one or hydroxyl groups, and (B3) optionally further hydroxy-functional compounds, in an NCO:OH equivalent ratio of 0.5:1 to 2.0:1; provided that (i) the polyacrylate component (B1) is prepared by polymerising a mixture of olefinically unsaturated monomers of which at least one must be hydroxy-functional, in the presence of component (B2) and optionally (B3); and (ii) the polyhydroxy component (B) has a OH group content of 3.0-18 (5.0- 15.0) wt. % and a viscosity at 23 degrees C of 200-10,000 (300-5000) mPa.s.