Patent ID: 6566444
Filing Date: 2003-05-20
Classification: C08G,C08L,C09D,Y10T

Abstract:
A water-dilutable binder composition comprisingA) at least one water-dilutable hydroxy-functional polyurethane urea resin having a urea group content (calculated as â€”NHCONHâ€”) of 10 to 300 mmol in 100 g of solid resin, a urethane group content (calculated as â€”NHCOOâ€”) of 20 to 300 mmol in 100 g of solid resin, an OH number of 20 to 250 and a number average molar mass Mn of 1000 to 20,000 g/mol; and B) 2.0 to 25 wt. % of at least one polyether polyol having a molar mass of 400 to 5000 g/mol, said wt. % of the polyether polyol being based on the solids content of the polyurethane urea resin used; â€ƒwherein the polyurethane urea resin of A) is formed by the following steps: I) preparing an NCO-group-containing polyurethane prepolymer by reacting: a1) at least one hydroxy-functional compound having a number-average molar mass Mn of 360 to 8000 g/mol; a2) at least one polyisocyanate; and a3) at least one compound having at least one group that reacts with isocyanate and at least one group that is ionic or capable of forming ions; II) reacting the NCO-group-containing polyurethane prepolymer prepared in step I with a4) at least one hydroxy-functional monamine and optionally with at least one polyol, in such relative amounts that the resulting polyurethane urea resin has the said hydroxyl numbers and said urea and urethane group content; III) neutralizing at least some of the ionic groups or groups that can be converted into ionic groups of the resulting polyurethane before or after the reaction in step II, and transferring the resulting reaction product into the aqueous phase.