| abstract |
The present invention relates to aqueous compositions containing uretdione groups, comprising or consisting of (A) at least one hardener containing uretdione groups, based on aliphatic, cycloaliphatic, araliphatic and / or aromatic polyisocyanates, which contains no chemically bound hydrophilizing groups; (B) at least one polyacrylate copolymer; (C) optionally solvent; and (D) optionally auxiliaries and additives; the quantitative ratio of components (A) and (B) being such that the molar ratio of the NCO groups of the hardener (A) present as uretdione to NCO-reactive groups of the polyacrylate copolymer (B) 3: 0.5 to 0.5 : 3 and where A and B exist as a physical mixture.n n n Furthermore, the invention relates to a method for producing a polyurethane layer using the aqueous uretdione group-containing composition of the present invention, the polyurethane layer obtained therefrom and a substrate which is coated or bonded with this polyurethane layer. |