The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2005
Filed:
Dec. 19, 2002
Andrew T. Daly, Sinking Spring, PA (US);
Navin Shah, Sinking Spring, PA (US);
Richard A. Kraski, Jr., Pittsburgh, PA (US);
Andrew T. Daly, Sinking Spring, PA (US);
Navin Shah, Sinking Spring, PA (US);
Richard A. Kraski, Jr., Pittsburgh, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
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 one wax, and one or more than one free radical photoinitiator, wherein the coating powder has an average particle size of 5 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.