Improved Anti-reflective coating systems, production thereof and use thereof

Abstract

The invention relates to coating materials for producing NIR-transparent anti-reflective coatings containing: one-component or two-component binder systems, polymer particles having D50 particle sizes in the range of 40 to 90 μm, and perylene black pigments. The invention also relates to methods for producing said coatings and to the use thereof on devices and components having functions that can be impaired by the reflection of light or by the absorption of infrared radiation.

Description

[0001] Mankiewicz Brothers & Co. 1

[0002] Improved anti-reflectivity coating systems, their manufacture and use

[0003] The invention relates to improved antireflective coatings that are NIR-transparent, i.e., permeable to NIR radiation. The term antireflective coating is understood below to mean coatings that suppress the reflection of light from surfaces. The invention further relates to methods for producing the coatings and their use in devices and components whose functions can be impaired by both the reflection of light and the absorption of infrared radiation. The term light is understood to mean the portions of the electromagnetic spectrum visible to the human eye, with wavelengths between 360 and 830 nm. NIR, or near-infrared, refers to the region of the electromagnetic spectrum with wavelengths between 780 and 1400 nm.

[0004] Different coatings and coating systems are used for coating components, particularly those for vehicle interiors (hereinafter referred to as interior components), depending on the technical requirements. In the following, a coating system is understood to be a structure comprising at least two superimposed layers, each layer consisting of at least one coating. In addition to the usual protective and decorative properties, the technical properties of a coated surface are increasingly coming to the fore. For components containing electronic elements, coatings are needed that do not impair the functionality of these elements. These components include, for example, interior components with operating, display, or control functions, such as control panels.

[0005] 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 2 and dashboards. The usual dark, mostly black, paint finish of these components contributes significantly to the undesirable heating of the vehicle interior when exposed to sunlight due to the absorption of infrared radiation. To prevent malfunctions caused by overheating, additional cooling systems have previously been integrated into the components to protect the temperature-sensitive electronic elements.

[0006] IR-reflective coatings for components are known from publications WO 2008 / 097895 A2 and WO 2011 / 056564 A2. WO 2008 / 097895 A2 describes dark-colored coating systems with an IR-reflective layer applied to a dark or black, IR-transparent paint layer. WO 2011 / 056564 A2 describes IR-reflective colored coatings containing both IR-reflective and IR-transparent pigments. These coatings can be used as a layer in conventional coating systems known to those skilled in the art, for example, as a primer or topcoat. However, the known coatings are not suitable as anti-reflective coatings for components whose functions could be impaired by the reflection of light.

[0007] It is therefore an object of the present invention to provide coatings for substrates, in particular for interior components in vehicles, which suppress the reflection of visible light and are simultaneously transparent to radiation in the infrared range, in particular in the near-infrared.

[0008] The problem is solved by the invention according to the invention.

[0009] Coating materials according to the main claim and by a method for producing NIR-transparent antireflective coatings

[0010] 0070195WC 26 . 07 . 2025 Mankiewicz Gebr. & Co . 3 on components, especially on interior components for vehicles .

[0011] The coating materials according to the invention comprise a binder system, one or more perylene black pigments, and polymer particles with particle sizes d50 in the range of 40 to 90 pm. The value d50 denotes the equivalent particle diameter below which 50 volume percent of the polymer particles lie. This value can be determined using conventional methods for determining particle sizes, such as laser diffraction or sieve analysis.

[0012] According to the invention, suitable polymer particles are made of polyurethanes (PU), polycarbonates (PC), polymethyl methacrylates (PMMA), or polyamides (PA). Polyurethane particles are preferred. The polymer particles used can be transparent or colored with perylene black pigments. Transparent polymer particles are preferred.

[0013] In preferred embodiments, the polymer particles have particle sizes d50 in the range of 50 to 90 pm, particularly in the range of 60 to 85 pm. The use of smaller particles leads to coatings with undesirably glossy surfaces, while the use of larger particles leads to coatings with reduced abrasion resistance.

[0014] According to the invention, the coating materials further comprise one or more matting agents. Suitable matting agents are micronized waxes such as polyethylene waxes, polypropylene waxes, polyamide waxes and PTFE waxes, micronized polymers such as urea sulfate resins, beeswax and carnauba waxes, amorphous silicas, precipitated silicas, and mixtures thereof. Silicas are preferably used.

[0015] 0070195WC 26 . 07. 2025 Mankiewicz Gebr. & Co. 4

[0016] In another embodiment, the coating materials according to the invention can contain further pigments that neither reflect nor absorb NIR radiation. Suitable pigments are, for example, iron oxides, chromium oxides, mica, and mixtures thereof.

[0017] The coating materials according to the invention can comprise one- or two-component binder systems. The two-component coating materials contain binders containing hydroxyl groups in their binder component and hardeners containing isocyanate groups in their hardener component. The two-component coating materials can contain solvent-dilutable or water-dilutable binders. The one-component coating materials contain water-dilutable polyurethane resin dispersions as binders, which cure without the addition of a hardener.

[0018] In a preferred embodiment, the two-component, solvent-dilutable coating materials comprise one or more hydroxy-functional polymers in the binder component. Suitable polymers are polyester polyols, polycarbonate polyols, polyacrylate polyols, polymethacrylate polyols, cellulose acetobutyrates, polycaprolactone polyols, or mixtures thereof. According to the invention, the hydroxy-functional polymers are used in amounts of 10 to 50 wt.%, preferably 15 to 45 wt.%, particularly preferably 20 to 40 wt.%, and most preferably 25 to 35 wt.%, in each case based on the total weight of the binder component.

[0019] In another preferred embodiment, the two-component, water-dilutable coating materials have one or more hydroxy functional compounds in the binder component.

[0020] 0070195WC 07 / 26 / 2025 Mankiewicz Gebr. & Co. 5

[0021] Polyurethane resin dispersions. Suitable dispersions are those of hydroxy-functional polyurethane resins, which have one or more, identical or different, functional groups selected from ester, ether, acrylate, methacrylate, and carbonate groups. Preferred are hydroxy-functional polyacrylate-polyurethane resin dispersions, polyester-polyurethane resin dispersions, polyether-polyurethane resin dispersions, polycarbonate-polyurethane resin dispersions, and mixtures thereof. Hydroxy-functional polycarbonate-polyurethane resin dispersions are particularly preferred. According to the invention, the hydroxy-functional polyurethane resin dispersions are used in amounts of 10 to 50 wt.%, preferably 15 to 45 wt.%, particularly preferably 20 to 40 wt.%, and most preferably 25 to 35 wt.%, in each case based on the total weight of the binder component.

[0022] The solvent- and water-dilutable binder components comprise at least the perylene black pigments and polymer particles mentioned above. The perylene black pigments are used in amounts of 1.5 to 3.5% by weight, preferably 2.0 to 3.3% by weight, and particularly preferably 2.5 to 3% by weight, in each case based on the total weight of the binder component. The polymer particles are used in amounts of 10 to 40% by weight, preferably 12 to 30% by weight, particularly preferably 14 to 25% by weight, and most preferably 16 to 20% by weight, in each case based on the total weight of the binder component. The use of smaller amounts of polymer particles leads to coatings with undesirably glossy surfaces, while the addition of larger amounts leads to coatings with uneven, brittle surfaces.

[0023] Furthermore, the binder components can be the above-mentioned

[0024] Matting agent in amounts of 2 to 8 wt.%, preferably 3

[0025] 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 6 to 7 wt.%, particularly preferably 4 to 6 wt.%, most preferably 4.5 to 5.5 wt.%, based on the total weight of the binder component. Additionally, the binder component may contain the pigments mentioned above, which neither reflect nor absorb NIR radiation.

[0026] The hardener component contains one or more isocyanates. Suitable isocyanates according to the invention are polymers and oligomers such as uretdiones, isocyanurates, allophaneates, biuretes and iminooxadiazindiones based on hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), isophorone diisocyanate (IPDI), 4,4'-diisocyanato-dicyclohexylmethane (HMDI), m-xylylene diisocyanate (XDI), 1,6-diisocyanato-2,2,4(2,4,4)-trimethylhexane (TMDI), tetramethylxylylene diisocyanate (TMXDI), isocyanato-functional reaction products of diisocyanates with mono- or polyhydric alcohols such as, for example, the reaction product of trimethylolpropane with an excess of toluene diisocyanate (available under the trade name "Desmodur L" from Covestro AG). blocked polyisocyanates, microencapsulated polyisocyanates and their mixtures.Preferred are uretdiones, isocyanurates, allophanates, biuretes, iminooxadiazinediones and mixtures thereof based on HDI, PDI or IPDI, particularly preferably based on HDI or PDI.

[0027] The binder component and the hardener component are used in a ratio of the OH groups of the binder to the NCO groups of the hardener in the range of 1 : 0.8 to 1 : 2.6, preferably from 1 : 1 to 1 : 2.4, particularly preferably 1 : 1.2 to 1 : 2.2.

[0028] Furthermore, the binder and hardener components according to the invention can contain one or more solvents. Suitable solvents for solvent-dilutable binders

[0029] 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 7 and hardeners are low-boiling organic solvents such as glycol ethers, esters, ketones, aliphatic hydrocarbons, aromatic hydrocarbons, cycloaliphatic hydrocarbons, and mixtures thereof. Suitable solvents for water-dilutable binders and hardeners are organic, water-miscible solvents such as ethers, ketones, and dimethyl sulfoxide.

[0030] Furthermore, the two-component coating materials according to the invention can contain the usual auxiliary materials and additives known to those skilled in the art, such as defoamers, thickeners, surface additives, wetting and dispersing additives.

[0031] In another preferred embodiment, the one-component coating materials comprise one or more water-dilutable, aliphatic polyurethane resin dispersions as binders. Suitable dispersions are polyurethane resins comprising one or more functional groups, either identical or different, selected from ester, ether, acrylate, methacrylate, and carbonate groups. Polyacrylate-polyurethane resin dispersions, polyester-polyurethane resin dispersions, polyether-polyurethane resin dispersions, polycarbonate-polyurethane resin dispersions, and mixtures thereof are preferred. Polycarbonate-polyurethane resin dispersions are particularly favored.

[0032] The one-component coating materials according to the invention contain 20 to 88 wt.% of one or more polyurethane resin dispersions based on the total weight of the coating material. Preferably, the polyurethane resin dispersions are used in amounts of 40 to 70 wt.%, more preferably 50 to 60 wt.%, and particularly preferably 53 to 57 wt.%.

[0033] 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 8 each based on the total weight of the

[0034] coating material.

[0035] Preferred polyurethane resin dispersions have solids contents in the range of 30 to 50%, preferably in the range of 35 to 45%, and particularly preferably in the range of 37 to 42%. Solids contents below the lower limit of this range result in coatings with significantly reduced resistance. Solids contents above the upper limit of this range result in coatings with undesirably increased gloss. Hereinafter, the solids content of the binder is defined as the mass fraction that remains as residue after evaporation under specified conditions. To determine this, approximately 1 g of substance is evaporated in an aluminum dish with a diameter of 8 cm at 105 °C in a drying oven or convection oven for 30 minutes. After cooling, the weight of the residue is determined. The solids content is the quotient of the weight of the residue and the amount of substance used. It is expressed as a percentage.

[0036] According to the invention, the polyurethane resin dispersions preferably have minimum film formation temperatures in the range of 0°C to 20°C, preferably from 0°C to 15°C, particularly preferably from 0°C to 10°C, and most preferably from 0°C to 5°C. The minimum film formation temperature (abbreviated: MET) is understood below to be the temperature above which a water-dilutable binder dispersion forms a continuous film. Below the minimum film formation temperature, film formation is impaired or incomplete. To determine the minimum film formation temperature, the dispersion is applied to a plate which is heated at one end and cooled at the other. Temperature sensors are installed in

[0037] 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 9 closely spaced along the plate, the minimum film formation temperature of the dispersion can be determined.

[0038] The one-component coating materials according to the invention comprise at least the perylene black pigments and polymer particles mentioned above. The perylene black pigments are used in amounts of 1.5 to 3.5% by weight, preferably 2.0 to 3.3% by weight, and particularly preferably 2.5 to 3% by weight, in each case based on the total weight of the coating material. The polymer particles are used in amounts of 10 to 40% by weight, preferably 12 to 30% by weight, particularly preferably 14 to 25% by weight, and most preferably 16 to 20% by weight, in each case based on the total weight of the coating material.

[0039] Furthermore, the one-component coating materials can contain the aforementioned matting agents in amounts of 2 to 8 wt.%, preferably 3 to 7 wt.%, particularly preferably 4 to 6 wt.%, and most preferably 4.5 to 5.5 wt.%, based on the total weight of the coating material. Additionally, the one-component coating material can contain the aforementioned pigments, which neither reflect nor absorb NIR radiation.

[0040] Furthermore, the one-component coating materials according to the invention can contain the usual auxiliary materials and additives known to those skilled in the art, such as defoamers, pH modifiers, thickeners, surface additives, wetting and dispersing additives.

[0041] Furthermore, the one-component according to the invention can be used in a variety of ways.

[0042] Coating materials contain one or more solvents.

[0043] 0070195WC July 26, 2025 Mankiewicz Gebr. & Co. 10

[0044] Suitable solvents are organic, water-miscible solvents.

[0045] Solvents such as ethers, ketones and dimethyl sulfoxide.

[0046] According to the invention, the one-component coating materials preferably have pigment volume concentrations of at least 70%, preferably at least 73%. The pigment volume concentration (PVC) of a coating material is defined as the ratio of the total volume of its solid particles that do not participate in film formation to the total volume of its non-volatile components. In addition to pigments and fillers, the solid particles also include other particles such as the polymer particles used according to the invention.

[0047] The one- and two-component coating materials according to the invention yield antireflective coatings that exhibit minimal residual gloss and very low reflection of incident light. Gloss refers to the optical property of a surface to reflect light wholly or partially specularly. The gloss level is expressed as the quotient of the specularly reflected component and the diffusely reflected component of a luminous flux incident on a surface. A specular gloss exhibits a diffusely reflected component close to zero, ideally zero. In contrast, a matte gloss or dullness exhibits a specularly reflected component close to zero, ideally zero. The gloss of surface coatings such as varnishes and paints is usually determined using a reflectometer or gloss meter. For this purpose, directed light is shone onto the sample surface at a defined angle.A detector records the light radiation reflected from the sample surface at the same angle. The results obtained are given in gloss units (GU). The angle at which the measurement is taken depends on the material and the detector.

[0048] 0070195WC 26 . 07 . 2025 Mankiewicz Gebr. & Co. 11 expected gloss selected so that the sensitivity of the detector is utilized as effectively as possible. The coatings according to the invention, with their rough, black surfaces, exhibit a very low gloss across the entire angular range, with values ​​in the range of 0 to 0.1 GU.

[0049] Reflectance refers to the optical property of a surface to reflect electromagnetic radiation completely or partially specularly. The THR (Total Hemispherical Reflectance) value describes the reflectance of a surface over the wavelength range between 360 and 740 nm. The higher the value, the more radiation is reflected. The coatings according to the invention exhibit THR values ​​of less than 1.2. These values ​​are determined using a conventional measurement method in which the sample is diffusely illuminated with an Ulbrich sphere, and the reflected and remitted radiation is measured at an angle of 8° to the sample.

[0050] Another aspect of the present invention is a method for producing NIR-reflecting antireflective coating systems, which comprises the following steps:

[0051] (a) Providing a coating material according to the invention,

[0052] (b) Applying the coating material to a NIR-reflective surface by spray application

[0053] (c) Allowing the applied coating film to dry at room temperature in the range between 20 and 35°C

[0054] (d) Drying the film at temperatures between 60 and 120 °C

[0055] 0070195WC July 26, 2025 Mankiewicz Gebr. & Co. 12

[0056] According to the invention, in step (b) the coating material is applied to the surface of a substrate made of NIR-reflecting material or to an NIR-reflecting layer on the substrate surface. These substrates and coatings can, for example, contain NIR-reflecting particles such as titanium dioxide or aluminum flakes.

[0057] In step (a), when using two-component binder systems, the binder and hardener components are homogeneously mixed. Furthermore, thinners in the form of solvents can be added to the coating materials in step (a) to improve their processability. Suitable thinners for solvent-dilutable binder systems are low-boiling organic solvents such as glycol ethers, esters, ketones, aliphatic hydrocarbons, aromatic hydrocarbons, cycloaliphatic hydrocarbons, and mixtures thereof. Suitable thinners for water-dilutable binder systems are water, acetone, ethanol, methanol, butanone, and mixtures thereof.

[0058] Due to their durability and mechanical stability, the coating materials according to the invention can be applied to a substrate surface using conventional spraying and atomizing methods known to those skilled in the art. Airless and compressed air spraying methods are preferred, in which liquid coating materials are applied as a film to the surface of a substrate to be coated using spray guns.

[0059] The coating materials according to the invention are applied to the surface of a substrate to be coated using a commercially available compressed air spray gun. Preferably, a

[0060] 0070195WC 26 . 07. 2025 Mankiewicz Gebr. & Co. 13

[0061] Spray nozzle size in the range of 1.2 to 1.6 mm and a

[0062] The atomizer pressure was set between 3.0 and 4.0 bar.

[0063] The coatings according to the invention preferably have dry film thicknesses of at least 100 pm, more preferably 100 to 180 pm, and particularly preferably 130 to 160 pm. Dry film thickness refers to the thickness of the cured coating. To achieve these dry film thicknesses, the coating materials according to the invention are applied very dry in at least two, more preferably at least three, and particularly preferably at least four spray passes. This means that the spray gun is moved at least twice over the surface to be sprayed at a large distance of at least 20 cm, more preferably 25 cm, and particularly preferably 30 cm, from the surface of the substrate. Repeating the spray passes results in a thick application of the coating materials, whereby, due to the large distance of the spray nozzle, some of the solvents evaporate before reaching the surface.

[0064] To form the coating, the assembly consisting of the substrate and the applied coating material is first allowed to evaporate for approximately 15 minutes at room temperature in the range of 20 to 35°C. Subsequently, the assembly is cured for approximately 30 minutes at temperatures in the range of 60 to 120°C, preferably in the range of 70 to 90°C, and particularly preferably in the range of 75 to 85°C.

[0065] Another aspect of the present invention is components comprising at least two layers. A first layer reflects radiation with wavelengths in the near-infrared range. A second layer applied to the first layer absorbs radiation with wavelengths in the visible light range. The first layer comprises a NIR-reflecting

[0066] 0070195WC July 26, 2025 Mankiewicz Gebr. & Co. 14

[0067] Substrate or an NIR-reflective coating. The second layer is made from coating materials according to the invention.

[0068] In the NIR range, the coating systems and components according to the invention exhibit TSR values ​​between 15 and 35%. The TSR value (Total Solar Reflectance) describes the reflectivity of a surface for electromagnetic radiation with wavelengths in the range of 250 to 2500 nm. The higher the value, the more radiation is reflected on average over the entire wavelength range, and the lower the heating of a surface. These values ​​are determined using a conventional measurement method in which the sample is diffusely illuminated with the aid of an Ulbrich sphere, and the reflected and remitted radiation is measured at an angle of 8° to the sample. These values ​​are determined using a conventional measurement method, for example, with the UV-VIS-IR measuring instrument IR 1503 from Shimadzu.

[0069] Unlike previously known antireflective coatings, which exhibit the same reflection behavior for NIR radiation as for radiation in the visible light range, the coatings according to the invention are NIR-transparent. They can therefore be used to produce antireflective coatings on IR-reflective components, particularly on devices and components where light reflections and heat are undesirable or disruptive. Furthermore, they exhibit high mechanical, thermal, and photochemical stability and can be processed using the standard processes employed for serial coating.

[0070] 0070195WC 26 . 07. 2025 Mankiewicz Gebr. & Co. 15

[0071] The coatings and coating systems according to the invention meet the specifications and standards applicable in the automotive sector. These include, among other things, resistance to creams, hydrolysis resistance, and low outgassing of volatile components (fogging). They can be used, in particular, on interior components for vehicles such as automobiles, aircraft, trains, and ships. They are preferably used on the operating surfaces of dashboards and control panels to prevent unwanted surface reflections and to prevent heating from solar radiation, thus protecting the technical and electronic devices.

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[0073] Examples

[0074] Example 1

[0075] Water-based, two-component coating material

[0076] Binder component

[0077] The hardener component contains oligomeric HDI-isocyanurate with an NCO content of 5.6 mol / kg. The binder and hardener components are used in a ratio of OH groups of the binder to NCO groups of the hardener of 1:1.8.

[0078] 0070195WO 07 / 26 / 2025 Mankiewicz Gebr. & Co. 17

[0079] Example 2

[0080] Solvent-dilutable, two-component coating material

[0081] B by! tt el component

[0082] The hardener component contains oligomeric HDI-isocyanurate with an NCO content of 5.6 mol / kg. The binder and hardener components are used in a ratio of OH groups of the binder to NCO groups of the hardener of 1:1.4.

[0083] 0070195WO 07 / 26 / 2025 Mankiewicz Gebr. & Co. 18

[0084] Example 3

[0085] Water-based, one-component coating material

[0086] Test methods

[0087] To determine the coating properties, test specimens are prepared. First, the coating material is prepared by mixing the components according to the example and applied by spraying onto plastic plates with a NIR-reflective primer. The plates are allowed to flash off for 15 minutes at room temperature and then dried for 30 minutes at 80 °C in a convection oven. The coated, dried plates are then tested.

[0088] 0070195WO July 26, 2025 Mankiewicz Gebr. & Co. 19

[0089] Gloss measurement

[0090] The micro-TRI-gloss gloss meter from BYK-Gardener is used to determine the gloss level. Measurements are taken at an angle of 60° and at an angle of 85°.

[0091] Determination of the THR value

[0092] The measurement is performed using the CM-3700A measuring device from Konica Minolta.

[0093] Determination of the TSR value

[0094] The Shimadzu TR 1503 UV-VIS-IR device is used to measure the TSR value.

[0095] Grid cut test

[0096] The adhesion of the coatings is tested using a cross-cut test. For this purpose, two strips of tape, each with six cuts, are applied to the coating on the test specimen at right angles to each other. The cuts extend down to the substrate surface. After applying the cuts, the cut area is brushed in a defined manner, and then, under defined conditions, the tape is abruptly pulled off. Beiersdorf Tesa tape 4657 is used. The results of the cross-cut test are visually assessed as follows:

[0097] Gt 0 smooth cut edges, no chipping

[0098] Gt 1 up to 5% of the sections have chipped off.

[0099] Gt 2: over 5 to 15% of the sections are chipped off; Gt 3: over 15 to 35% of the sections are chipped off; Gt 4: over 35 to 65% of the sections are chipped off; Gt 5: over 65% of the sections are chipped off

[0100] 0070195WO 26 . 07. 2025 Mankiewicz Gebr. & Co. 20

[0101] Testing the cream's durability

[0102] A piece of gauze bandage (approx. 3 x 3 cm) is placed on the coated surface of the test specimens and coated with test cream (test creams from Thierry GmbH). The cream is pressed through the gauze bandage onto the surface and spread so that the spaces between the meshes are filled with cream. Excess cream is wiped off. The coated test specimen, thus prepared, is stored with the gauze bandage in a convection oven at 80°C for 24 hours. The gauze bandage is then removed and the remaining cream is wiped off with a cloth. Before further testing and evaluation of the surface, the test specimens are conditioned at room temperature for 4 hours. The adhesion of the coating is then determined using the cross-cut test.

[0103] Hydrolysis resistance testing

[0104] After preconditioning (48 hours storage at 60°C), the coated specimens are stored in a climate chamber for 72 hours at 90°C and > 93% relative humidity. The specimens are then conditioned for 30 minutes at room temperature. Finally, the adhesion of the coating is determined using the cross-cut test.

[0105] Condensation constant climate test

[0106] After preconditioning (48 hours at 60°C or 7 days at room temperature), the coated specimens are stored in a climate chamber for 240 hours at 40°C and > 98% relative humidity. The specimens are then conditioned for 60 minutes at room temperature. Subsequently, the adhesion of the coating is determined using the cross-cut test, and its scratch resistance is determined using the Erichsen scratch hardness test.

[0107] 0070195WC 26 . 07. 2025 Mankiewicz Gebr. & Co. 21

[0108] Results

[0109] For comparison, test specimens with an antireflective coating made from a commercially available coating material VI were also examined. Table 1 shows the test results.

[0110] Table 1: Test results

[0111] 0070195WO 26.07.2025

Claims

Mankiewicz Brothers & Co. 22 Patent claims 1. Coating material for the production of an IR-transparent antireflective coating containing - a binder system, - Polymer particles having particle sizes d50 in the range of 40 to 90 pm and one or more perylene black pigments .

2. Coating material according to claim 1, characterized in that the polymer particles are spheres.

3. Coating material according to claim 1 or 2, characterized in that the polymer particles are transparent.

4. Coating material according to claim 1 or 2, characterized in that the polymer particles are colored with perylene black pigments.

5. Coating material according to one of the preceding claims, characterized in that the coating material further comprises matting agents selected from the group comprising micronized waxes, micronized polymers, amorphous silicas, precipitated silicas and mixtures thereof.

6. Coating material according to one of claims 1 to 5, characterized in that the coating material comprises a binder component and a hardener component, wherein the hardener component comprises one or more isocyanates. 0070195WC 26.07.2025 Mankiewicz Brothers & Co. 23 7. Coating material according to claim 6, characterized in that the binder component contains one or more hydroxy-functional polymers.

8. Coating material according to claim 7, characterized in that the binder component contains one or more water-dilutable, aliphatic polyurethane resin dispersions.

9. Coating material according to one of claims 6 to 8, characterized in that the polymer particles are contained in the binder component in amounts of 10 to 40 wt.% based on the total weight of the binder component.

10. Coating material according to any one of claims 6 to 9, characterized in that the perylene black pigments are contained in the binder component in amounts of 1.5 to 3.5% wt.% based on the total weight of the binder component.

11. Coating material according to one of claims 1 to 5, characterized in that the coating material contains one or more water-dilutable, aliphatic polyurethane resin dispersions as a binder.

12. Coating material according to claim 11, characterized in that the polymer particles are contained in amounts of 10 to 40 wt.% based on the total weight of the coating material.

13. Coating material according to claim 11 or 12, characterized in that the perylene black pigments are present in quantities 0070195WC 26.07.2025 Mankiewicz Gebr. & Co. 24 of 1.5 to 3.5% wt.% based on the total weight of the They contain a binder component.

14. Method for producing NIR-reflecting antireflective coating systems comprising the steps: (a) Providing a coating material according to any one of claims 1 to 13, (b) Applying the coating material to a NIR-reflective surface by spray application, (c) Allowing the applied coating film to dry at room temperature in the range between 20 and 35°C, (d) Drying the film at temperatures between 60 and 120 °C.

15. Method according to claim 14, characterized in that the coating material is applied in step (b) to IR-reflecting surfaces of IR-reflecting substrates .

16. Method according to claim 15, characterized in that the coating material is applied in step (b) to substrate surfaces which have IR-reflecting coatings.

17. Component comprising a first layer which reflects radiation with wavelengths in the near-infrared range, and a second layer applied to the first layer which absorbs radiation with wavelengths in the visible range, characterized in that the second layer is made of coating materials according to one of claims 1 to 13. 0070195WC 26.07.2025

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