High solids clear coating composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsIsao Nagata, Peter William Uhlianuk
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Abstract
The present invention provides for an etch and mar resistant low VOC clear coating composition most suitable for use as a top clear coat in multi-layered OEM or refinish automotive coatings. The coating composition includes isocyanate, carbonate and melamine components. The isocyanate component includes an aliphatic polyisocyanate. The composition may be formulated as a two-pack or one-pack coating composition, wherein the isocyanate functionalities are blocked with a blocker such as a mono-alcohol.
Claims26
A clear coating composition comprising isocyanate, cyclic carbonate and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities.
A method of producing a clear coating on a substrate comprising:
- applying a layer of a one-pack clear coating composition comprising isocyanate, cyclic carbonate and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities wherein said isocyanate functionalities of the polyisocyanate are blocked by reacting said polyisocyanate with a monomeric alcohol;
- and
- curing said layer into said clear coating at an elevated baking temperature in the range 80° C. to 160° C.
A method of producing a clear coating on a substrate comprising:
- applying a layer of a two-pack clear coating composition consisting essentially of isocyanate, cyclic carbonate and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities;
- and
- curing said layer into said clear coating under ambient conditions or at an elevated baking temperature in the range 80° C. to 160° C.
Dependencies are inferred from the claim text.