| 摘要 |
The present invention relates to an aqueous binder composition containing A) an aqueous solution or dispersion of a water-dilutable organic polyol component containing A1) at least one water-dilutable polyester resin containing sulfonate and hydroxyl groups and having a molecular weight (M n) of 500 to 50,000, an OH number of 20 to 240 mg KOH/g, a content of sulfonate groups (-SO3-) of 4 to 70 milliequivalents per 100 g of polyester resin and a content of carboxylate groups (-COO-) of 0 to 40 milliequivalents per 100 g of polyester resin and A2) optionally a reactive thinner containing at least one water-soluble monohydric or polyhydric alcohol which has a molecular weight (M n) below 500 and which is non-distillable at normal pressure or has a boiling point of at least 150.degree.C, and B) a polyisocyanate component which is emulsified in the aqueous solution or dispersion A), has a viscosity at 23.degree.C of 50 to 10,000 mPa.s and contains at least one organic polyisocyanate, wherein components A) and B) are present at an NCO:OH equivalent ratio of 0.5:1 to 5:1. The present invention also relates to a process for the production of a coating or sealing composition containing this aqueous binder.
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