| abstract |
Aqueous dispersions containing a polyurethane(A) having structural units derivedfrom compounds of the formula (I) (see fig. I) in which the substituents have the following meanings: R1, R2, R3 independently denote hydrogen, C1-C24 alkyl or C6-C24 alkenyl R4 denotes hydrogen R5, R6 (a) together denote C4-C10 alkanediyl, (b) each denotes C2-C10 alkyl, C5-C8 cycloalkyl or C7-C20 aralkyl, (c) each denotes a hydroxyl-terminated poly(C2-C4 alkylene oxide), or (d) one radical R5 or R6 has the meaning stated under (a) to (c) and the other is hydrogen or a radical of the formula II (see fig. II) in which X denotes C2-C6 alkanediyl and R7 has the same meaning as R5 or R6 except that R7 does not denote a radical of the formula II, where . - the radicals R5 and R6 in each of the cases (a) and (d) carry a total of one (1 ) hydroxyl group attached to an aliphatic carbon atom, - optionally the radical R5 and/or R6 carries 1 or 2 hydroxyl groups bonded to an aromatic carbon atom or one nitrile, tertiary amino, carboxylic acid or sulfonic acid group which are optionally present in the form of their salts, and- the average functionality (F) of all structural components of the polyurethane (A) is from 1.5 to 2.2, based on the functionalities which interreact during thesynthesis of the polyurethane (A) in an addition reaction. |