The invention relates to a cationically hydrophilized polyurethaneurea characterized in that it is synthesized froma) at least one aliphatic, araliphatic and/or cycloaliphatic polyisocyanate,b) polyols having a number-average molecular weight Mn ≥ 400 and ≤ 6000 g/mol and a hydroxyl functionality of ≥ 1.5 and ≤ 4, comprising at least one polyester polyol b1), which has an amorphous structure and which comprises as synthesis component at least one aromatic dicarboxylic acid and/or the corresponding carboxylic anhydride, the fraction of aromatic dicarboxylic acids and/or their anhydrides in the polyester polyol being ≥ 35 wt%, based on the overall mass of the polyester polyol,c) at least one cationically hydrophilizing component which has at least one group that is reactive towards isocyanate groups, and has at least one cationic or potentially cationic group,d) at least one aliphatic, amino-functional compound which has at least two isocyanate-reactive amino groups,e) optionally at least one alcohol which has at least two hydroxyl groups and a molar mass ≥ 60 and ≤ 399 g/mol andf) optionally at least one compound which has a group that is reactive towards isocyanate groups.;The invention further relates to an aqueous dispersion comprising the polyurethaneurea and to a coating composition comprising the polyurethaneurea or the corresponding aqueous dispersion. Further subjects of the invention are a method for coating substrates using the coating composition of the invention, and the coated substrate obtainable in such a method.
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机译：本发明涉及阳离子亲水化的聚氨酯脲，其特征在于它是由a）至少一种脂族，芳脂族和/或脂环族多异氰酸酯，b）数均分子量Mn≥400且≤6000g/ mol且羟基官能度≥1.5且≤4的多元醇，其包含至少一种聚酯多元醇b1），其具有无定形结构并且包含作为合成组分至少一种芳族二羧酸和/或相应的羧酸酐，基于聚酯多元醇的总质量，聚酯多元醇中芳族二羧酸和/或其酸酐的比例≥35 wt％，c）至少一种阳离子亲水化组分，其具有至少一个对异氰酸酯基具有反应性的基团，并且具有至少一个阳离子或潜在的阳离子基团，d）至少一种具有至少两个异氰酸酯反应性氨基的脂族氨基官能化合物，e）任选地至少一种具有至少两个羟基且摩尔质量≥60且≤399 g / mol的醇，和f）任选地至少一种具有对异氰酸酯基团具有反应性的基团的化合物。;本发明还涉及包含聚氨酯脲的水性分散体以及包含聚氨酯脲或相应的水性分散体的涂料组合物。本发明的其他主题是使用本发明的涂料组合物涂覆基材的方法，以及可通过这种方法获得的涂覆的基材。
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