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US 7,618,677 B2Granted
Method of powder coating weldable substrates
AssigneePPG Industries Ohio, Inc.
InventorsRobert R. Roelofs, Hans F. Letzring
Life of this patent
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Abstract
This invention is directed to an improved method of coating a substrate. The improvement includes applying to the substrate a rinse composition which contains one or more surface energy-modifying compounds. The invention is further directed to an improved method of producing weldable parts and the parts prepared by this method. The invention is especially useful for automotive parts using weldable pre-painted metal substrates to which are applied essentially zero VOC powder coatings.
Claims33
A method of coating a substrate comprising:
- (a) optionally, applying a pretreatment composition to the substrate;
- (b) optionally, applying a conductive, weldable coating composition to the substrate;
- (c) optionally, coalescing the conductive, weldable coating composition to form a substantially continuous conductive coating;
- (d) applying a rinse composition to the substrate, said rinse composition comprising one or more surface energy modifying compounds;
- (e) applying a powder coating composition to the substrate of step (d);
- (f) heating the powder coating composition to a temperature and for a period of time sufficient to melt the powder coating composition to form a substantially continuous powder coating on the substrate, but not to crosslink the powder coating composition;
- (g) optionally, applying a clear coating composition over at least a portion of the powder coating;
- and
- (h) heating the substrate to a temperature and for a period of time sufficient to coalesce and crosslink the coating composition applied in step (e) and, optionally, step (g).
6 more elements
A method of coating a substrate comprising:
- (a) optionally, applying a pretreatment composition to at least a portion of the substrate;
- (b) applying a rinse composition to the substrate, said rinse composition comprising one or more surface energy-modifying compounds;
- (c) applying a powder coating composition to the substrate of step (b);
- and
- (d) heating the substrate to a temperature and for a time sufficient to melt and coalesce the powder coating composition to form a substantially continuous powder coating on the substrate, but not to crosslink the powder coating composition;
- and
- (e) heating the substrate for a period of time sufficient to coalesce and crosslink the powder coating composition of step (d).
4 more elements
Dependencies are inferred from the claim text.