| Solvent-free, aliphatic polyurethane resin dispersion in water. Binder for waterborne, air- and oven-drying base coats in two-coat systems for the coating of plastics and as a combination binder for soft-touch coatings. Properties / Applications: When used in two-layer systems with two-component polyurethane clearcoats, metallic basecoats formulated with Bayhydrol® UH 650 are characterized by good adhesion to many types of plastics, good overcoatability and good water resistance. The metallic basecoat can be oversprayed with a two-component polyurethane clearcoat after predrying e.g. for 5 min at an ambient temperature of 80 °C or for 15 min at room temperature. Forced drying is possible at temperatures as low as 60 °C. Bayhydrol® UH 650 is compatible with water-thinnable polyesters and some acrylic dispersions. Given the many resins available, compatibility testing is recommended. Information provided by Covestro |
