# US 12,001,034 B2 · Near infrared control coating, articles formed therefrom, and methods of making the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,034 B2 - Document ID: US12001034B2 - Status: Granted - Kind: B2 - Application number: 18/052,619 - Filed: 2022-11-04 - Published: 2023-04-13 - Granted: 2024-06-04 - Earliest claimed: 2019-01-07 - Assignees: PPG Industries Ohio, Inc. - Applicants: PPG Industries Ohio, Inc. - Inventors: Shuyu Fang; Eldon L. Decker; Kristen M. Kruszewski - Web page: https://patentgrep.com/patent/US12001034B2 ## CPC - C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes - G02B 5/08: Mirrors {(vehicle mirrors involving special optical features B60R1/08)} - G06K 7/10: by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation - C09D 5/004: {Reflecting paints; Signal paints} - G02B 5/0808: {having a single reflecting layer (G02B5/0883, G02B5/0891 take precedence)} - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract A coating composition for application over a retroreflective substrate, a retroreflective article comprising a coating formed from the coating composition, and a method of production thereof are provided. The coating composition comprises a pigment suitable to absorb and/or scatter electromagnetic radiation in a wavelength range of 800 nm to 2000 nm. The coating comprises a ratio of reduction in electromagnetic radiation retroreflectance at a wavelength of 905 nm and/or 1550 nm to reduction in electromagnetic radiation retroreflectance averaged over a wavelength range of 400 nm to 700 nm of at least 2:1. ## Claims ### Claim 1 A method for producing a retroreflective article with reduced electromagnetic radiation retroreflection at a wavelength of 905 nm and/or 1550 nm, the method comprising: depositing a coating composition over a retroreflective substrate to form a coating on the retroreflective substrate and thereby the retroreflective article, the coating composition comprising: a film-forming resin; and a pigment suitable to absorb and/or scatter electromagnetic radiation in a wavelength range of 800 nm to 2000 nm; wherein the coating comprises a ratio of reduction in electromagnetic radiation retroreflectance at a wavelength of 905 nm and/or 1550 nm to reduction in electromagnetic radiation retroreflectance averaged over a wavelength range of 400 nm to 700 nm of at least 2:1. ### Claim 2 (depends on 1) The method of claim 1, wherein the depositing is performed on-site. ### Claim 3 (depends on 1) The method of claim 1, wherein the depositing is performed during manufacture of the retroreflective article. ### Claim 4 (depends on 1) The method of claim 1, wherein the depositing comprises at least one of spray coating, spin coating, dip coating, roll coating, flow coating, and film coating. ### Claim 5 (depends on 1) The method of claim 1, further comprising curing the coating composition to form the coating. ### Claim 6 (depends on 1) The method of claim 1, wherein the deposition is performed such that a dry film thickness of the coating composition is in a range of 0.2 um to 500 um. ### Claim 7 (depends on 1) The method of claim 1, wherein the coating composition is deposited directly on the retroreflective substrate. ### Claim 8 (depends on 1) The method of claim 1, wherein the coating composition is deposited on an underlying layer on the retroreflective substrate. ### Claim 9 (depends on 1) The method of claim 1, wherein the retroreflective article further comprises a clear coat, a primer, or a combination thereof. ### Claim 10 (depends on 1) The method of claim 1, wherein the retroreflective article comprises at least one of a tape, a sign, a vehicle, a marker, and clothing. ### Claim 11 (depends on 10) The method of claim 10, wherein the retroreflective article comprises the sign and the sign comprises at least one of a stop sign, a yield sign, and a one-way sign. ### Claim 12 (depends on 10) The method of claim 10, wherein the retroreflective article comprises the marker and the marker comprises at least one of a barrier, a barricade, a speed bump, a traffic cone, and a road surface. ### Claim 13 (depends on 10) The method of claim 10, wherein the retroreflective article comprises the vehicle and the vehicle comprises at least one of an automobile, a bicycle, a truck, a bus, an airplane, a boat, a drone, and a submarine. ### Claim 14 (depends on 1) The method of claim 1, wherein the coating composition is manufactured into a preformed film and the preformed film is deposited over the retroreflective substrate. ### Claim 15 (depends on 1) The method of claim 1, wherein the coating comprises a ratio of reduction in electromagnetic radiation retroreflectance at a wavelength of 905 nm and/or 1550 nm to reduction in electromagnetic radiation retroreflectance averaged over a wavelength range of 400 nm to 700 nm of at least 4:1. ### Claim 16 (depends on 1) The method of claim 1, wherein the coating absorbs at least 0.1 absorbance units of electromagnetic radiation at a wavelength of 905 nm, the coating absorbs at least 0.2 absorbance units of electromagnetic radiation at a wavelength of 1550 nm, or a combination thereof. ### Claim 17 (depends on 1) The method of claim 1, wherein the pigment comprises at least one of zinc oxide, alumina, antimony tin oxide, tungsten oxide, gold nanoparticles, silver nanoparticles, copper nanoparticles, lanthanum hexaboride, dicopper hydroxide phosphate, and a phthalocyanine. ### Claim 18 (depends on 1) The method of claim 1, wherein the pigment comprises an average particle size of 1 nm to 5000 nm. ### Claim 19 (depends on 1) The method of claim 1, wherein the film-forming resin comprises at least one of a thermosetting film-forming resin and a thermoplastic film-forming resin. ### Claim 20 (depends on 1) The method composition of claim 1, wherein the coating transmits 80 percent or less of electromagnetic radiation at a wavelength of 905 nm.