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US 12,454,622 B2Granted
Coating providing controlled absorption and scattering
AssigneeEastman Kodak Company
InventorsKevin D. Lofftus, Nair Mridula, Sreekumar Cumar
Life of this patent
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Abstract
An article includes a substrate with a surface, a coating disposed over the surface, and a subtractive colorant which absorbs electromagnetic radiation according to a specified absorption spectrum. The coating includes a binder material and 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.
Claims17
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.
9 more elements
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 porous polymer particles include:
- a first set of porous polymer particles having pores with a first average pore size adapted to scatter electromagnetic radiation in a first wavelength band;
- and
- a second set of porous polymer particles having pores with a second average pore size adapted to scatter electromagnetic radiation in a second wavelength band, 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 material.
9 more elements
Dependencies are inferred from the claim text.