UV curable powder coating compositions for improved through-cure
OwnerOwen H. Decker, Frederick L. Bailey +3inventors
InventorsOwen H. Decker, Frederick L. Bailey, Denis K. Desai, Zbigniew Stachyra, M. Aaron Sparks
Life of this patent
Estimating the term…
Abstract
UV curable powder coating compositions containing 5 to 60 wt % spherical or near spherical particles having a median diameter of greater than 10, and most preferably greater than 15 microns, which refract and scatter applied UV light in all directions through the coating layer during curing to enhance the through-cure properties of the resulting coating.
Claims12
An ultraviolet radiation curable powder coating composition wherein the improvement is the use in the composition of light-refractive spheroidal particles, wherein the spheroidal particles comprise 5 to 50 wt % of the coating composition and wherein said spheroidal particles have a median particle diameter of greater than 10 microns and have a maximum particle diameter of about 50 microns.
An ultraviolet radiation curable powder coating composition containing a particulate blend of
- (a) at least one ethylenically unsaturated, photopolymerizable resin,
- (b) a pigment or a dye, and
- (c) a photoinitiator,
- wherein the improvement is the use in the composition of light-refractive glass or polymer microbeads, which refract and scatter applied UV light in all directions through the coating layer during curing.
A process of improving the through-cure of a ultraviolet radiation curable powder coating, comprising the step of adding to a powder coating composition between 5 and 60 wt %, based on the weight of the composition, of spheroidal particles having a median particle diameter of greater than 10 microns and a maximum diameter of about 50 microns.
Dependencies are inferred from the claim text.