Patent ID: 7276554
Filing Date: 2007-10-02
Classification: C08G,C09D,Y10T

Abstract:
1. Coating materials comprising I) one or more dispersions of hydroxyl-free polyurethanes and/or polyurethane-ureas (PU dispersions) II) one or more aqueous solutions or dispersions of ionically modified, hydroxyl-containing polyurethanes and/or polyurethane-ureas, other than the constituents of component I), and III) at least one crosslinker and IV) optionally other film-forming resins, wherein the PU dispersions used in I) are obtained by A) preparing an NCO-containing polyurethane prepolymer by reacting B) either dissolving the prepolymer obtained from step A) in aliphatic ketones or, diluting the prepolymer solution if the preparation has already been carried out in the presence of A6) by further addition of aliphatic ketones, and C) reacting the remaining free NCO groups of the prepolymer with a chain extender component comprising with the proviso that