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US 12,480,002 B2Granted
Direct-to-metal coating composition
AssigneeSwimc LLC
InventorsSundaresan Avudaiappan, Wendy M. Novelli, Ganesh S. Desai
Life of this patent
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Abstract
A fast drying, heavy metal-free, high performance coating composition with outstanding UV resistance, and excellent corrosion resistance coupled with fast dry and long pot life. This coating can be applied over DTM, such as blasted cold rolled steel, or treated cold rolled steel, aluminum and treated aluminum. High corrosion resistance without sacrificing gloss or UV resistance achieved by selecting proper pigments and proper pigment design and packing by advantageously utilizing differing pigment morphologies (sizes and shape).
Claims12
A coating composition comprising:
- (a) a binder resin system selected from the group consisting of one or more acrylic resin, polyester polyol resin, and aspartic ester resin;
- (b) a crosslinker resin;
- (c) a plurality of filler and extender pigments having median particle size of 0.1 to 10 μm comprising
- (i) between 5 to 50 wt %, spherical shaped pigment;
- (ii) between 3 to 30 wt acicular shaped pigment;
- and
- (iii) between 1 to 30 wt % platy-shaped pigment;
- and
- (d) a corrosion inhibiting pigment,
- wherein the coating composition is applied to a substrate as a direct-to-metal coating having creep from scribe of less than 3 mm after 500 hours of salt spray testing according to ASTM B117, and color change (ΔE) of less than about 0.5 after 1200 hours of uv exposure in Xenon Accelerated Weather testing according to ASTM G155-05a Cycle 7A.
7 more elements
Dependencies are inferred from the claim text.