| 摘要 |
The present invention relates to a process for preparing aqueous binders f or aqueous coating compositions by reacting a mixture of A) 9.9 to 85 wt.% of a hydroxy- and acid-functional poly(meth)acrylate a nd B) 14.9 to 90 wt.% of a hydroxy-functional, fatty acid-modified polyeste r with C) 0.1 to 20 wt.% of a diisocyanate having a molecular weight of 140 to 31 8, to form urethane groups and then dissolving or dispersing the reaction produ ct in water with prior or simultaneous neutralization of at least a portion of the carboxyl groups present, wherein the sum of the percentages of A) to C) add up to 100 . The present invention also relates to the aqueous binders obtained by th is process and their use, optionally combined with other oxidatively drying lacquer resins, in air- and/or heat-drying, two-component coating compositions, preferably aqueous polyurethane coating compositions, or in combination with optionally blocked polyisocyanates and/or amino cross-linking agents in aqueous heat- curing coating compositions.
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