| 摘要 |
A process for preparing polyester-polyurethane resin dispersions that includes: A) reacting one or more polyol components i) having an average molecular weight of at least 300, at least one of the components being a polyester polyol and the fraction of polyester polyol based on aromatic polycarboxylic acids being more than 50% by weight with a polyisocyanate to form a prepolymer, B) dissolving the prepolymer in an organic solvent; C) reacting the prepolymer with aliphatic polyamines having a molecular weight of 60 to 300 or hydrazine and a hydrophilicized aliphatic diamine, D) precipitating the product from C) by adding water to form a dispersion, and E) removing the organic solvent. The resulting polyester-polyurethane resin dispersions can be used in coating compositions and in coating systems that include a substrate and one or more coating films, at least one of which includes the polyester-polyurethane resin dispersion.
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