| 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>, R<2>, R<3> each designate hydrogen, C1-C24 alkyl or C6 - C24 alkenyl; R<4> designates hydrogen; R<5>, R<6> a) together designate C4-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 R<6> 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 C2-C6 alkane-diyl; and R<7> has the same meaning as R<5> or R<6> with the exception that R<7> is not a group of formula II, R<5> and R<6> carrying a total of between 2 and 5 hydroxyl groups bonded to aliphatic carbon atoms; and R<5> and/or R<6> 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. |