Curable polyurethane polymer dispersion based on this polymer, processing for preparing the dispersion, and its use

A curable polyurethane polymer which comprises in copolymerized form

• A) from 40 to 80% by weight, based on the overall weight of components A) to F), of at least one hydroxyl-containing prepolymer having at least one free-radically or photochemically polymerizable α,β-ethylenically unsaturated double bond, where the prepolymer is selected from the group consisting of polyether acrylates, epoxy acrylates, reaction products and mixtures thereof, and the hydroxyl number of the prepolymer lies within a range from 121 to 300 mg of KOH/g,
• B) from 0.1 to 20% by weight, based on the overall weight of components A) to F), of at least one compound having at least one isocyanate-reactive hydroxyl group and/or primary or secondary amino group and, in addition, at least one polar functional group,
• C) from 0.1 to 10% by weight, based on the overall weight of components A) to F), of at least one compound selected from diamines, polyamines and mixtures thereof,
• D) from 0 to 20% by weight, based on the overall weight of components A) to F), of at least one further compound other than A), B), C) and E), having at least two isocyanate-reactive groups, which are hydroxyl groups and mixtures of hydroxyl groups and/or primary or secondary amino groups,
• E) from 0 to 20% by weight, based on the overall weight of components A) to F), of at least one compound having an isocyanate-reactive group,
• F) from 10 to 50% by weight, based on the overall weight of components A) to F), of at least one polyisocyanate,
• or a salt thereof.