Coating system exhibiting cool dark color
A layered coating composition for use in producing a cool dark coating composition. The coating system includes an IR reflecting layer, having IR-reflective pigments in a resinous binder. A radiation absorbing layer is coated onto the IR reflecting layer. The radiation absorbing layer includes nano-sized pigments dispersed in a resinous binder.
1. A layered coating system comprising:
a first IR-reflecting layer comprising IR-reflective pigments in a resinous binder; and
a second visible radiation absorbing layer that is transparent to IR radiation, said second layer comprising a plurality of tints in a resinous binder, said tints comprising nano-sized pigments having an average primary particle size of up to 100 nm, wherein at least one of said tints comprises a non-black pigment,
wherein said layered coating system exhibits a jetness value of at least 240.
2. The layered coating system of claim 1 , wherein said nano-sized pigments have an average primary particle size of up to 50 nm.
3. The layered coating system of claim 1 , wherein said nano-sized pigments have an average primary particle size of up to 30 nm.
4. The layered coating system of claim 1 , wherein said tints each have a maximum haze of 10%.
5. The layered coating system of claim 4 , wherein said tints each have a maximum haze of 1%.
6. The layered coating system of claim 4 , wherein no such tints comprise carbon black pigment.
7. The layered coating system of claim 1 , wherein at least one of the tints comprises a dispersant comprising a tri-block copolymer comprising:
(i) a first block comprising an oxirane functional monomer reacted with a carboxylic acid;
(ii) a second block comprising a (meth)acrylic acid alkyl ester; and
(iii) a third block comprising a (meth)acrylic acid alkyl ester, wherein the third block is different from the second block.
8. The layered coating system of claim 1 , wherein said tints do not comprise a carbon black pigment.
9. A coating exhibiting a jet black color, wherein:
(a) the coating is deposited from a composition comprising:
(i) a resinous binder; and
(ii) a plurality of tints having a maximum haze of 10% and comprising nano-sized pigments having an average primary particle size of up to 100 nanometers, wherein at least one of the tints comprises a non-black pigment; and
(b) the coating has a jetness value of at least 240.
10. The coating of claim 9 , wherein the tints each have a maximum haze of 1%.
11. The coating of claim 10 , wherein none of said plurality of tints comprises carbon black.
12. The coating of claim 9 , wherein at least one of the tints comprises a dispersant comprising a tri-block copolymer comprising:
(i) a first block comprising an oxirane functional monomer reacted with a carboxylic acid;
(ii) a second block comprising a (meth)acrylic acid alkyl ester; and
(iii) a third block comprising a (meth)acrylic acid alkyl ester, wherein the third block is different from the second block.
13. The coating of claim 9 , wherein said tints do not comprise a carbon black pigment.