Aqueous composition for corrosion resistant fastener coatings
AssigneeE. I. Du Pont de Nemours and Company
InventorsXUEPU MAO, Jeffrey Hugh Hamilton, Michael J. Witsch, Craig King Hennessey
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Abstract
The present invention provides aqueous coating compositions for metal substrates, where the coating provides improved corrosion resistance compared to conventional aqueous corrosion resistant coatings. The coating comprises (a) one or more functionalized acrylic polymer; (b) one or more melamine resin; (c) one or more perfluorinated polymer; and (d) one or more dispersing polymer selected from the group consisting of polyimide (P1), polyamideimide (PAI), polyether sulfone (PES), polyphenylene sulfide (PPS), and a mixture thereof. The composition is particularly useful for fasteners, such as nuts and bolts, used in marine environments.
Claims20
An aqueous coating composition comprising, based on weight percent of solids expressed as a percentage of the total weight of solids in the composition:
- (a) 20-90 weight % of one or more functionalized acrylic polymer;
- (b) 1-30 weight % of one or more melamine resin;
- (c) 5-30 weight % of one or more perfluorinated polymer;
- and
- (d) 1-35 weight % of one or more dispersing polymer selected from the group consisting of polyimide (P1), polyamideimide (PAI), polyether sulfone (PES), polyphenylene sulfide (PPS) and a mixture thereof.
Dependencies are inferred from the claim text.