The present invention provides a polyurethane resin obtainable by(A) in a first reaction stage (A) reacting(a) one or more di- and/or polyisocyanates,(b) one or more compounds (b) which have at least one group which ensures dispersibility in water and more than one group which is reactive toward isocyanate groups, and(c) if desired, one or more compounds having at least 2 and not more than 3 OH groupsto give an intermediate (A) having free isocyanate groups and having urethane groups,(B) in a second reaction stage (B) adding(d) one or more monoisocyanatesto the intermediate (A) obtained in stage (A), and(C) subsequently reacting the resulting mixture (B) with one or more hydroxyl-containing polymers (D) to give the polyurethane resin (P), using less than 20% by weight, based on the weight of the polyurethane resin (solids content), of polyalkylene oxide diols and/or polyalkylene oxide polyols to prepare the polyurethane resin.
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