US 12,454,622 B2
Coating providing controlled absorption and scattering
Kevin D. Lofftus, Fairport, NY (US); Nair Mridula, Penfield, NY (US); and Sreekumar Cumar, Penfield, NY (US)
Assigned to EASTMAN KODAK COMPANY, Rochester, NY (US)
Filed by Eastman Kodak Company, Rochester, NY (US)
Filed on Dec. 8, 2021, as Appl. No. 17/545,058.
Prior Publication US 2022/0204783 A1, Jun. 30, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 5/30 (2006.01); C09D 5/02 (2006.01); C09D 5/32 (2006.01); C09D 7/41 (2018.01); C09D 7/65 (2018.01); C09D 11/023 (2014.01); C09D 11/037 (2014.01); C09D 11/107 (2014.01); C09D 133/04 (2006.01); D06N 3/00 (2006.01); D06N 3/04 (2006.01); D06P 1/00 (2006.01); D06P 1/52 (2006.01)
CPC C09D 5/30 (2013.01) [C09D 5/02 (2013.01); C09D 5/32 (2013.01); C09D 7/41 (2018.01); C09D 7/65 (2018.01); C09D 11/023 (2013.01); C09D 11/037 (2013.01); C09D 11/107 (2013.01); C09D 133/04 (2013.01); D06N 3/0043 (2013.01); D06N 3/0063 (2013.01); D06N 3/0065 (2013.01); D06N 3/042 (2013.01); D06P 1/004 (2013.01); D06P 1/525 (2013.01); D06N 2201/042 (2013.01); D06N 2203/041 (2013.01); D06N 2205/10 (2013.01); D06N 2209/04 (2013.01); D06N 2209/0846 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An article comprising:
a substrate with a surface;
a coating disposed over the surface, including:
a plurality of porous polymer particles having pores with a distribution of pore sizes adapted to scatter electromagnetic radiation in one or more specified wavelength bands, wherein the porous polymer particles have a shell which is impermeable to a liquid; and
a binder material; and
a subtractive colorant which absorbs electromagnetic radiation according to a specified absorption spectrum,
wherein the coating has an interstitial void volume of less than 3 volume % not filled with the binder material, and the plurality of porous polymer particles comprises at least some of one or more of the following sets of porous polymer particles:
a set of near-infrared scattering pores having an average pore size d in the range 0.3≤d/λ≤0.7, wherein λ is a wavelength in the range of 700-3000 nm,
a set of visible light scattering pores having an average pore size d in the range 0.3≤d/λ≤0.7, wherein λ is a wavelength in the range of 400-700 nm, and
a set of ultraviolet scattering pores having an average pore size d in the range 0.3≤d/λ≤0.7, wherein λ is a wavelength in the range of 250-400 nm, and
the absorption spectrum of the subtractive colorant together with scattering characteristics of the porous polymer particles are adapted to match spectral characteristics of a specified background.