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US 7,018,682 B1Granted
Method for refinishing defects in stoved enamels with powder coatings
AssigneeE. I. DuPont de Nemours and Company
InventorsArmin Rettig, Olaf Thiele
Life of this patent
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Abstract
Method of repairing defective areas in a stoving lacquer coating, in which the defective area ready for repair lacquering is coated with a powder coating composition or with an aqueous powder coating slurry, and the applied powder coating is then melted and cured by irradiation with near infrared radiation (NIR).
Claims19
A method of repairing at least one defective area in at least one stoving lacquer coating comprising the steps of:
- (a) applying a pulverulent powder coating directly to at least one defective area, wherein said powder coating has a mean particle size ranging from about 1 to about 90 μm and comprises a heat-curable binder system selected from the group consisting of a self-crosslinking system and an externally crosslinked system;
- and
- (b) melting and curing the applied powder coating by irradiation for 1 to 300 seconds with near infrared radiation in the wave length range from about 760 nm to about 1500 nm emitted by a high-energy near infrared radiation radiator having a radiation density of more than 1 W/cm2 to 15 MW/m2 and operated at a radiator surface temperature of 2000 to 3000 K. to form a repaired area.
Dependencies are inferred from the claim text.