| 摘要 |
<p>1. Aqueous dispersions with a content of organic solids of 30 to 80 % by weight, based on the aqueous dispersion, which are based on I. 60 to 90 % by weight, based on the sum of I + II, of oil-free polyester or alkyl resin, II. 10 to 40 % by weight, based on the sum of I + II, of crosslinking agent, III. 0 to 1.5 % by weight, based on the sum of I + II, of emulsifier and, if appropriate, IV. customary amounts of auxiliaries and additives, characterized in that the oil-free polyesters and alkyd resins I have an average functionality of 2.5 to 10, an average degree of condensation of 10 to 25, and an average content of urethane groups of 3 to 6 per molecule and contain radicals of cocondensed 2,2-di(hydroxy-methyl)-carboxylic acids corresponding to an acid number of 15 to 30, at least 80 % of which are neutralized, in that the crosslinking agent II consists of a) water-soluble aminoplast resin and b) blocked polyisocyanate, the weight ratio of a/b being 0.33 to 1.0, and in that the content of organic solvent is less than 8 % by weight, based on the dispersion.</p> |
