| abstract |
The present invention relates to an aqueous composition containing uretdione groups, said composition comprising or consisting of (A) at least one polyisocyanate-containing compound based on aliphatic, cycloaliphatic, araliphatic and/or aromatic A curing agent for uretdione groups, which does not contain chemically bonded hydrophilizing groups; (B) at least one hydroxyl-containing polyol containing at least one chemically bonded carboxylic acid group; (C) optionally and (D) optional auxiliaries and additives; wherein the amount ratio of components (A) and (B) is metered such that the NCO groups of the curing agent (A) present as uretdione and the polyol (B) has a molar ratio of NCO-reactive groups of 3:0.5 to 0.5:3 and wherein A and B are present as a physical mixture. Furthermore, the invention relates to a process for producing a polyurethane layer using the aqueous uretdione group-containing composition according to the invention, the polyurethane layer obtained by this process, and substrates coated or bonded with said polyurethane layer. |