High solids clear coating composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsUhlianuk Peter William, Isao Nagata, Jun Lin, Donald Albert Pacquet, Jr.
Life of this patent
Estimating the term…
Abstract
The present invention provides for a 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 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.
Claims21
A low VOC clear high solids coating composition consisting essentially of isocyanate and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2.5 to 6 isocyanate functionalities, wherein said isocyanate functionalities are unblocked or blocked by reacting with a monomeric alcohol selected from the group consisting of methanol, ethanol, propanol, butanol, isopropanol, isobutanol, hexanol, 2-ethylhexanol and cyclohexanol;
- and wherein said melamine component comprises an alkoxy monomeric melamine, polymeric melamine, or a combination thereof.
A method of producing a clear coating on a substrate comprising:
- applying a layer of a low VOC clear high solids coating composition consisting essentially of isocyanate and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2.5 to 6 isocyanate functionalities, wherein said isocyanate functionalities are unblocked or blocked by reacting with a monomeric alcohol selected from the group consisting of methanol, ethanol, propanol, butanol, isopropanol, isobutanol, hexanol, 2-ethylhexanol and cyclohexanol, and wherein said melamine component comprises a an alkoxy monomeric melamine, polymeric melamine, or a combination thereof, and
- curing said layer into said clear coating.
Dependencies are inferred from the claim text.