| abstract |
The invention concerns aqueous dispersions containing a polyurethane (A), containing structural units derived from compounds of formula (I), in which the substituents have the following meanings: R?1, R2, R3¿ each designate hydrogen, C¿1?-C24 alkyl or C6 - C24 alkenyl; R?4¿ designates hydrogen; R5, R6 a) together designate C¿4?-C10 alkane-diyl, b) each designate C2-C10 alkyl, C5-C8 cycloalkyl or C7-C20 aralkyl, c) each designate a hydroxyl-terminated poly(C2-C4 alkylene oxide), or d) designate an R?5 or R6¿ group with the meaning given in (a) to (c) and the other group designating hydrogen or a group of formula (II), in which X designates C¿2?-C6 alkane-diyl; and R?7¿ has the same meaning as R5 or R6 with the exception that R7 is not a group of formula II, R?5 and R6¿ carrying a total of between 2 and 5 hydroxyl groups bonded to aliphatic carbon atoms; and R5 and/or R6 optionally carrying 1 or 2 aromatically bonded hydroxyl groups or 1 nitrile, tertiary amino, carboxylic acid or sulphonic acid group which are optionally present in the form of their salts. |