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US 5,021,297 AGranted
Process for coating plastic substrates with powder coating compositions
AssigneePPG Industries, Inc.
InventorsFrederick F. Rhue, William D. Franks, Gary C. Craig
Life of this patent
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Abstract
A method of coating plastic substrates susceptible to gassing with a powder coating composition is disclosed. The method is effective in sealing the substrate against popping.
Claims14
A process of coating a preformed fiber-reinforced plastic substrate susceptible to gassing upon heating comprising:
- (a) preheating the substrate at temperatures and for time sufficient to degas the substrate, said temperatures above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition;
- (b) applying immediately a thermosetting powder coating composition to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition;
- and
- (c) heating immediately the coated substrate at a temperature and for a time sufficient to cure the thermosetting powder coating composition.
1 more element
A process of coating a preformed glass fiber-reinforced polyester substrate susceptible to gassing upon heating comprising:
- (a) preheating the substrate at a temperature of at least 300.degree. F. (149.degree. C.) for at least 15 minutes to degas the substrate, said temperature being above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition;
- (b) applying immediately a thermosetting powder coating composition at a thickness of from 3 to 6 mils to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition;
- and
- (c) heating at a temperature of at least 250.degree. F. (121.degree. C.) for at least 15 minutes until the powder coating composition is cured.
1 more element
Dependencies are inferred from the claim text.