The invention relates to polyurethane-polyurea dispersions, also called PU dispersion, which contain aralkylamine-blocked isocyanate groups, and to their preparation and use. This blocking agent ahs a significantly lower deblocking temperature as compared with the prior art. Coatings produced from this dispersion have high hydrolysis resistances. The arylamine-blocked isocyanate groups are composed of polyisocyanates, polymeric polyols having average molar weights of 400 to 6000, at least one blocking agent, and either or both of nonionically hydrophilicizing compounds or compounds having at least one ionic or potentially ionic group.
本发明涉及含有烷基胺封端
异氰酸酯基团的聚
氨酯-聚
脲分散体(也称聚
氨酯分散体)及其制备和使用。与现有技术相比,这种封端剂的解封温度要低得多。用这种分散体生产的涂料具有很高的耐
水解性。芳胺封端
异氰酸酯基团由多
异氰酸酯、平均摩尔重量为 400 至 6000 的聚合多元醇、至少一种封端剂以及非离子亲
水化合物或至少具有一个离子基团或潜在离子基团的化合物中的一种或两种组成。