Waterborne coating compositions for soft touch coatings
AssigneePPG Industries Ohio, Inc.
InventorsColin O. Schmucker, Steven Bowles, Irina Schwendeman, Venkateshwarlu Kalsani, Sarah K. Elzer
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Abstract
A waterborne coating composition includes an aqueous polyurethane resin, a reactive silicone component, and a crosslinker. The aqueous polyurethane resin can have urethane linkages, hydrazinecarboxamide linkages, and reactive hydrazide functional groups. The polyurethane resin can have a glass transition temperature of less than 25° C. Methods of preparing waterborne coating compositions and substrates at least partially coated with waterborne coating compositions are also disclosed.
Claims23
A waterborne coating composition comprising:
- an aqueous polyurethane resin comprising urethane linkages, hydrazinecarboxamide linkages, and reactive hydrazide functional groups, wherein the aqueous polyurethane resin has a glass transition temperature of less than 25° C.;
- a reactive silicone component;
- and
- a crosslinker.
A method of preparing a waterborne coating composition comprising:
- a) mixing a diol or polyol and an isocyanate to form an isocyanate functional polyurethane resin;
- b) mixing, in an aqueous medium, the isocyanate functional polyurethane resin and adipic acid dihydrazide to form an aqueous polyurethane resin comprising urethane linkages, hydrazinecarboxamide linkages, and reactive hydrazide functional groups, wherein the aqueous polyurethane resin has a glass transition temperature of less than 25° C.;
- c) mixing a reactive silicone component with the aqueous polyurethane resin;
- and
- d) combining the mixture of the reactive silicone component and aqueous polyurethane resin with a crosslinker.
Dependencies are inferred from the claim text.