Aqueous polyurethane solutions for polyurethane systems

Preparing aqueous solution of urea group, containing hydroxyl functional polyurethane, comprises producing isocyanate functional prepolymer by reacting at least one hydroxyl and/or amino functional hydrophilic agent with at least one acid group or its salt, or at least one tert.amino group or its salt, at least one polyol, and at least one polyisocyanate; reacting the prepolymer with an amino alcohol component from amino alcohol with a primary or secondary amino group and at least one hydroxyl group; and dissolving the obtained urea group containing, hydroxyl functional polyurethane in water. Preparing aqueous solution of urea group, containing hydroxyl functional polyurethane with hydroxyl group content of 2-10 wt.% and urea group content is 3-20 wt.%, which is derived from amino alcohol with a primary or secondary amino group and at least one hydroxyl group, comprises producing isocyanate functional prepolymer by reacting at least one hydroxyl and/or amino functional hydrophilic agent with at least one acid group or its salt, or at least one tert.amino group or its salt, at least one polyol, and at least one polyisocyanate; reacting the prepolymer with an amino alcohol component from amino alcohol with a primary or secondary amino group and at least one hydroxyl group, where the amount of the amino alcohol with a secondary amino group is at least 60 wt.%; and dissolving the obtained urea group containing, hydroxyl functional polyurethane in water, where before or during the dissolving in water, the acid or tert.amino group of the hydrophilic agent are reacted with a neutralizing agent. Independent claims are included for: (1) the aqueous solution of urea group, containing hydroxyl functional polyurethane, obtained by the above process; (2) a polyurethane system comprising a component, which is urea group containing hydroxyl functional polyurethane or its aqueous solution; and (3) the polyurethane obtained using polyurethane system. Die vorliegende Erfindung betrifft neuartige wässrige Polyurethanlösungen, die darin enthaltenen löslichen Polyurethane, ein Verfahren zur deren Herstellung sowie die Verwendung in Polyurethan-Systemen.