C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 163/00 (2006.01) C08J 3/12 (2006.01) C08L 67/06 (2006.01) C09D 5/03 (2006.01) C09D 133/04 (2006.01) C09D 167/06 (2006.01) C08L 63/00 (2006.01) C08L 91/06 (2006.01)
Patent
CA 2444305
The present invention provides ultraviolet (UV) curable powders for powder coatings comprising one or more than one free radical curable epoxy resin and one or more than one second free radical curable resin, or, alternatively, one or more than one free radical curable unsaturated polyester resin in combination with one or more than wax, and one or more than one free radical photoinitiator, wherein the coating powder ha.s an average particle size of to 25 microns. Further, the present invention provides a method for making a powder for thin (1.0 to 4.0 mil), smooth coatings having an average particle size of from 5 to 25 microns, the method preferably comprising jet milling dry powder or spray drying an aqueous emulsion, fluid mixture, or a supercritical suspension of a powder or of the composition for making the powder. Still further, the present invention provides a method of making a powder coating comprising applying the powder to a substrate, preferably hardwood, heat fusing the applied powder, and UV curing at a temperature and for an amount of time sufficient to form a powder coating having a low gloss finish.
Daly Andrew T.
Kraski Richard A. Jr.
Shah Navin
Gowling Lafleur Henderson Llp
Rohm & Haas Company
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