| abstract |
A pigment paste containing water-dilutable hydroxy-functional polyurethaneurea paste resins with a urea group content (calculated as -NHCONH-) of 10 to 300 mmol, a urethane group content (calculated as -NHCOO-) of 20 to 300 mmol, each per 100 g of solid resin, an OH value of 20 to 250 mg KOH/g, an acid value of 15 to 80 and a molecular weight Mn of 1000 to 20000 obtainable byI) preparing a NCO group-containing polyurethane prepolymer by reactinga1) hydroxy-functional compounds with a molecular weight (Mn) of 360 to 8000 witha2) polyisocyanates anda3) compounds with at least one group which can react with isocyanate and at least one ionic group,II) subsequent reaction of the prepolymer witha4) hydroxy-functional monoamines and optionally polyols andIII) neutralisation of groups which can be converted into ionic groups. |