Multilayered coating with powder clear coating and substrates th

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B32B 904

Patent

active

060776080

ABSTRACT:
Cured thermoset multilayered composite coatings with a powder clear coat and a waterborne base coat have improved chip resistance for the coating. The waterborne base coat composition has one or more crosslinkable film-forming polymers, one or more crosslinking agents for crosslinking the film-forming polymer, and one or more pigments. This basecoat is applied to a bare or previously painted substrate to give a film thickness in the range of about 0.1 to 3 mils (2.54 to 76.2 microns). The basecoat is dehydrated from treatment at a temperature from ambient to an elevated temperature of up to about 90.degree. C. for up to about 15 minutes before it is contacted with powder clear coating composition. The powder clear coating composition has a predominant amount of one or more crosslinkable, meltable and mobile film-forming polymer and/or copolymer having a weight average molecular weight of one or polymers/copolymers in the range of about 2000 to about 6000. The film-forming polymer or copolymer has an amount of functionality for crosslinking of at least 40 weight percent of the total resin solids for the polymers. The glass transition temperature for the powder coating composition is at least about 25.degree. C. The powder coating composition for the clear coat also has one or more crosslinking agents and when cured has a film thickness in the range of about 35 to about 100 microns. The basecoat and clear coat are co-cured. Optionally, one or more primer coats may be beneath the basecoat.

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