Smooth thin film powder coatings

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/46 (2006.01) B05D 3/02 (2006.01) C08J 3/12 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2163936

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.

Divulgation d'une poudre de revêtement constituée principalement de particules, en général sphériques, dont la taille varie de moins de 2 à environ 40 microns. Cette poudre est constituée à 75 %, en volume, de particules de taille allant d'environ 2 à environ 20 microns. Les constituants de cette poudre de revêtement sont dissous dans un fluide supercritique, sans l'aide d'un surfactant, et la solution obtenue est pulvérisée dans une zone dont la pression est inférieure à celle du fluide. On obtient un film continu très lisse de poudre de revêtement polymérisée et durcissable à chaud, même lorsque l'épaisseur du film est inférieure à 1 mil, par exemple, d'environ 0,2 ou plus. Les avantages de ces poudres de revêtement peuvent maintenant être pleinement exploités dans les industries automobile et des boîtes métalliques.

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