Coating processes – Spraying – Heated coating material
Patent
1998-05-08
1999-11-09
Dudash, Diana
Coating processes
Spraying
Heated coating material
4274071, 427409, 427410, B05D 102, B05D 302, B05D 726, B05D 136
Patent
active
059809930
ABSTRACT:
A method of applying a color-plus-clear composite coating to a substrate is provided comprising: applying to the substrate a colored film-forming composition to form a base coat and applying to the base coat a clear film-forming composition to form a transparent top coat over the base coat. Prior to application to the base coat, the clear film-forming composition is heated to a temperature and for a time sufficient to lower its viscosity such that the composition can be atomized and applied as a smooth continuous film. At a temperature of 20-25.degree. C., the clear film-forming composition has a high viscosity such that it cannot be atomized and applied as a smooth continuous film. The clear film-forming composition comprises (1) about 65 to about 85 percent by weight, based on the total weight of resin solids in the clear film-forming composition, of a hydroxyl functional acrylic polymer having a weight average molecular weight of about 5000 to about 25,000 as determined by gel permeation chromatography using a polystyrene standard, and having a glass transition temperature of at least about 10.degree. C.; and (2) about 15 to about 35 percent by weight, based on the total weight of resin solids in the clear film-forming composition, of an aminoplast crosslinking agent.
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Coleridge Edward R.
Emch Donaldson J.
Martin Roxalana L.
Mauer George W.
Dudash Diana
PPG Industries Ohio Inc.
Shideler Krisanne
Uhl William J.
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