Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1982-06-21
1984-02-21
Jacobs, Lewis T.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427410, 523458, 523466, B05D 302
Patent
active
044330146
ABSTRACT:
A pigmented, thermosetting organic solvent solution coating composition having improved capacity to resist acid rain is disclosed in which a resinous polyepoxide, a phenoplast resin cross-linking agent for said polyepoxide (preferably a xylolol-formaldehyde condensate), a phosphoric acid ester catalyst, a chromium-containing pigment providing resistance to corrosion, and a clay having the capacity to fix phosphate, are combined. For package stability, the catalyst is the reaction product of ortho phosphoric acid with an aliphatic diol, there being sufficient hydroxy in said diol to provide at least 1 equivalent of hydroxy for each acid equivalent in said phosphoric acid. These coatings are applied as a prime coating which is baked to remove solvents and provide a dry film without removing the phosphoric acid contained therein. The dry primer is then overcoated with a topcoat, and the doubly coated substrate is baked to cure the first coating.
REFERENCES:
patent: 3262903 (1966-07-01), Robertson
patent: 3759751 (1973-09-01), Smith
patent: 4210569 (1980-07-01), Sysjuk et al.
Gaske Joseph E.
Pennanen Hannu K.
DeSoto, Inc.
Jacobs Lewis T.
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