TWO-COMPONENT WATER-BASED COMPOSITIONS THAT PRODUCE HIGH GLOSS POLYURETHANE COATINGS WITH GOOD APPEARANCE

摘要

Two-component water-based coating compositions are described. The coating compositions include a mixture of components that includes: (a) an aqueous dispersion of a resin comprising functional groups reactive with isocyanates; and (b) a hydrophilicized polyisocyanate. The mixture includes (i) propylene carbonate that is present in the mixture in an amount of greater than 2 percent by weight, based on the total weight of the mixture; and (ii) a ratio of isocyanate groups to functional groups reactive with isocyanates of 0.8 to 3.0:1.

主权项

1. A two-component water-based coating composition comprising a mixture of components comprising:
(a) an aqueous dispersion of a resin comprising functional groups reactive with isocyanates; and (b) a hydrophilicized polyisocyanate, wherein the mixture:
(i) comprises propylene carbonate that is present in the mixture in an amount of greater than 2 percent by weight, based on the total weight of the mixture; and(ii) has a ratio of isocyanate groups to functional groups reactive with isocyanates of 0.8 to 3.0:1.