Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating
Patent
1992-11-13
1993-10-26
Shine, W. J.
Coating processes
Applying superposed diverse coating or coating a coated base
Synthetic resin coating
427410, B05D 136, B05D 714, B05D 704
Patent
active
052564525
ABSTRACT:
A stable one package etch-resistant film-forming composition is disclosed. The composition includes a polyepoxide component having an epoxy equivalent weight on resin solids of less than about 600. The composition further includes a polyacid curing agent having an average acid functionality of greater than 2. The composition is substantially free of basic esterification catalyst, has a cured softening point of greater than about 20.degree. C., and is stable for use as a single-component composition. Also disclosed is a process for applying a color-plus-clear composite coating to a substrate which includes applying a acid-catalyzed thermosetting film-forming composition to a substrate to form a basecoat. The process also comprises applying a stable etch-resistant film-forming composition to the basecoat which includes a polyepoxide and a polyacid curing agent as described above, wherein the topcoat is substantially free of basic esterification catalyst, has a cured softening point of greater than about 20.degree. C. The composition and process are useful in original equipment finishing of automobile and trucks.
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Klanica Joseph A.
Mayo Michael A.
McMonigal Susan U.
Simpson Dennis A.
Singer Debra L.
McGinty Douglas J.
PPG Industries Inc.
Shine W. J.
Uhl William J.
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