Smooth thin film powder coatings
AssigneeMorton International, Inc.
InventorsAndrew T. Daly, Navin B. Shah, Glenn D. Correll, Karl R. Wursthorn
Life of this patent
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Abstract
A coating powder consisting essentially of generally spherical particles ranging in size from less than 2 to about 40 microns, 75% of whose volume consists of particles of from about 2 to about 20 microns in size, is provided by dissolving the components of the coating powder in a supercritical fluid without the aid of a surfactant and spraying the solution into a zone whose pressure is less than that of the fluid. A very smooth continuous film of a cured thermosettable coating powder is achieved even when the film thickness is less than 1 mil, e.g., from about 0.2 and greater. The advantages of powder coatings may now be realized fully in the automobile and can industries.
Claims14
A coating powder consisting essentially of cellular, generally spherical particles wherein about 96% by volume of the particles have a size of about 20 microns or less.
A method for applying a continuous film of cured coating powder to a substrate, said method comprising spraying a powder consisting essentially of cellular, generally spherical particles having a particle size distribution such that about 96% by volume of the particles have a size of about 20 microns or less onto a substrate, fusing the powder, and curing the powder.
A powder coated wooden article prepared by applying a coating powder consisting essentially of cellular, generally spherical particles having a particle size distribution such that about 96% by volume of the particles have a size of about 20 microns or less, heating the powder to fuse it, and, optionally, heating the resultant fused film to cure it.
A powder coated article prepared by applying a coating powder consisting essentially of cellular, generally spherical particles having a particle size distribution such that about 96% by volume of the particles have a size of about 20 microns or less, heating the powder to fuse it, and, optionally, heating the resultant fused film to cure it.
Dependencies are inferred from the claim text.