Composite pane with an IR-reflective coating

Abstract

The present invention relates to a composite pane having an IR-reflective coating (20), comprising a first dielectric layer module (M1), a first silver layer (Ag1), a second dielectric layer module (M2), a second silver layer (Ag2), and a third dielectric layer module (M3). The first silver layer (Ag1) and the second silver layer (Ag2) each have a thickness of 6 nm to 16 nm. The optical thickness of the first dielectric layer module (M1) is from 30 nm to 110 nm, that of the second dielectric layer module (M2) is from 150 nm to 210 nm, and that of the third dielectric layer module (M3) is from 50 nm to 100 nm. The ratio of the optical thickness of the first dielectric layer module (M1) to that of the second dielectric layer module (M2) is from 0.15 to 0.55, the ratio of the optical thickness of the first dielectric layer module (M1) to that of the third dielectric layer module (M3) is from 0.55 to 1.55, and the ratio of the optical thickness of the second dielectric layer module (M2) to that of the third dielectric layer module (M3) is from 2.15 to 2.85. Each dielectric layer module (M1, M2, M3) contains an optically highly refractive antireflection layer (22b.1, 22c.1, 22b.2, 22c.3) having a refractive index of more than 2.1.

Description

[0001] Saint-Gobain Sekurit France 2024326-WO-PCT

[0002] Composite disc with an IR-reflective coating

[0003] The invention relates to a composite disc with an IR-reflective coating.

[0004] It is known that laminated glass can be provided with transparent IR-reflective coatings. Such coatings are commonly used, for example, on vehicle windows and are also known as solar control coatings. These coatings reflect portions of solar radiation in the near-infrared range and can thereby reduce the heating of the vehicle interior, thus improving thermal comfort. Such coatings typically contain metallic layers, particularly silver-based ones. References to WO03024155A2, US20070082219A1, and US20070020465A1 are provided by way of example.

[0005] Reference is made to WO2013104438A1 or W02013004439A1. The corrosion-prone IR-reflective coatings are typically located inside the laminated glass, so that they have no contact with the surrounding atmosphere.

[0006] Types of IR-reflective coatings are also known, for example, from CN106116177A, CN105271815A, EP1828074A1, CN201817404U and WO2018012883A1.

[0007] IR-reflective coatings are practically indispensable, especially for vehicle roof windows, because otherwise a critical amount of thermal energy would enter the vehicle interior. To further improve thermal insulation, such laminated glass panes often have an emissivity-reducing coating (so-called Low-E coating) on ​​the interior surface of the inner pane. An emissivity-reducing coating is reflective in the mid-infrared range. This reduces the heat radiation from the heated laminated glass into the interior and, at low outside temperatures, reduces heat radiation from the interior. This further improves thermal comfort. Laminated glass panes with a solar control coating and an emissivity-reducing coating are, for example, from W02019110172A1 and WO2021180544A1.

[0008] The IR-reflective coatings have a significant impact on the aesthetic appearance of the laminated glass, particularly the exterior reflection color. An observer perceives the laminated glass with a characteristic color impression. This reflection color is typically highly dependent on the viewing angle, which can be distracting. This is especially true for curved laminated glass, such as that used in the Saint-Gobain Sekurit France 2024326-WO-PCT.

[0009] This can occur in the vehicle area, which is problematic because a stationary observer sees different areas of the laminated glass from different viewing angles due to the curvature of the glass, which can lead to an inconsistent color impression.

[0010] Therefore, there is a need for laminated glass panes with an IR-reflective coating, characterized by a pleasant and as neutral a color appearance as possible, which is also as independent as possible from the viewing angle. The laminated glass pane should also effectively reduce the thermal energy input into the interior space it encloses.

[0011] The present invention is based on the objective of providing such an improved composite disc.

[0012] The object of the present invention is achieved according to the invention by a composite disk according to claim 1. Preferred embodiments are described in the dependent claims.

[0013] The composite disc according to the invention with an IR-reflecting coating comprises an outer disc and an inner disc which are connected to each other via a thermoplastic intermediate layer.

[0014] The laminated glass pane is designed to separate the interior space from the exterior environment in a window opening (for example, in a building or, preferably, in a vehicle). For the purposes of the invention, the term "inner pane" refers to the pane of the laminated glass facing the interior space (in particular, the vehicle interior). The term "outer pane" refers to the pane facing the exterior environment.

[0015] The outer pane and the inner pane each have an outer and an inner surface and a circumferential side edge running between them. For the purposes of the invention, the outer surface is defined as the main surface which, in the installed position, is intended to face the external environment. For the purposes of the invention, the inner surface is defined as the main surface which, in the installed position, is intended to face the interior. The inner surface of the outer pane and the outer surface of the Saint-Gobain Sekurit France 2024326-WO-PCT

[0016] The inner discs face each other and the intermediate layer and are connected to each other by the thermoplastic intermediate layer.

[0017] The laminated glass pane also includes an IR-reflective coating on the surface of the outer pane or the inner pane facing the interlayer, i.e., on the interior surface of the outer pane or the exterior surface of the inner pane. It has been shown that the optical and thermal properties of the IR-reflective coating are particularly advantageous when it is applied to the surface of the outer pane facing the interlayer, which is therefore preferred, especially with regard to a neutral reflection color and good shielding against the IR components of solar radiation.

[0018] The IR-reflective coating exhibits reflective properties in the infrared spectral range (IR range), particularly in the near-IR range. Such IR-reflective coatings are also known as solar control coatings. Their function is to reflect the infrared components of solar radiation. The IR-reflective coating is, in particular, a transparent, electrically conductive coating. A transparent coating is defined as one that has an average transmission in the visible spectral range of at least 70%, meaning it does not significantly impair visibility through the pane. Preferably, at least 80% of the surface area of ​​the laminated pane is coated with the solar control coating.In particular, the solar control coating is applied across the entire surface, with the exception of a perimeter border and optionally local areas that, as communication, sensor, or camera windows, are intended to ensure the transmission of electromagnetic radiation through the laminated glass and are therefore not coated. The perimeter uncoated border, for example, has a width of up to 20 cm. It prevents direct contact between the IR-reflective coating and the surrounding atmosphere, thus protecting the coating inside the laminated glass from corrosion and damage.

[0019] The IR-reflective coating is a stack or sequence of layers, in particular thin films, comprising several electrically conductive, in particular metal-containing, layers, wherein each electrically conductive layer is arranged between two dielectric layer modules. The coating is thus a thin-film stack with n electrically conductive layers and (n+1) dielectric layer modules, where n is a natural number and where a lower dielectric layer module is located in the Saint-Gobain Sekurit France 2024326-WO-PCT

[0020] A conductive layer is followed by a dielectric layer module. Each layer module can consist of a single dielectric layer or of several dielectric layers, i.e., a dielectric layer sequence. The layer modules are therefore designed as dielectric layers or layer sequences.

[0021] The electrically conductive layers impart their IR-reflective properties and electrical conductivity to the IR-reflective coating. These electrically conductive layers are silver (Ag) based, meaning they consist essentially of silver, apart from any dopants or impurities. For the purposes of this invention, these electrically conductive layers are therefore also referred to as silver layers. In an advantageous embodiment, each silver layer contains at least 90 wt.% silver, preferably at least 99 wt.% silver, and particularly preferably at least 99.9 wt.% silver. The silver layers may contain dopants, for example, palladium, gold, copper, or aluminum.

[0022] If a thin film is formed based on a material, the film consists mostly of this material in addition to any impurities or dopants.

[0023] The IR-reflective coating according to the invention comprises at least two silver layers. The natural number n is therefore at least 2. Starting from the surface on which the coating is applied (the inner surface of the outer pane or the outer surface of the inner pane), the IR-reflective coating according to the invention thus comprises, in the specified order, at least

[0024] - a first dielectric layer module,

[0025] - a first layer of silver,

[0026] - a second dielectric layer module,

[0027] - a second layer of silver,

[0028] - a third dielectric layer module.

[0029] The first dielectric layer modulus is preferably the lowest layer modulus of the IR-reflecting coating, and the third dielectric layer modulus is the uppermost layer modulus of the IR-reflecting coating. Therefore, preferably no further silver layer is arranged below the first dielectric layer modulus, nor above the third dielectric layer modulus. Saint-Gobain Sekurit France 2024326- WO-PCT

[0030] Terms such as "above", "below", "over", "below", "top", and "bottom" always refer, within the meaning of the invention, to the sequence of layers starting from the surface on which the IR-reflecting coating is applied. If a first layer is arranged above a second layer, this means, within the meaning of the invention, that the first layer is arranged further away from said surface than the second layer. If a first layer is arranged below a second layer, this means, within the meaning of the invention, that the second layer is arranged further away from said surface than the first layer.

[0031] The IR-reflective coating is characterized according to the invention by the fact that

[0032] - the first silver layer and the second silver layer each have a thickness of 6 nm to 16 nm,

[0033] - the optical thickness of the first dielectric layer modulus ranges from 30 nm to 110 nm,

[0034] - the optical thickness of the second dielectric layer modulus ranges from 150 nm to 210 nm,

[0035] - the optical thickness of the third dielectric layer modulus is from 50 nm to 100 nm,

[0036] - the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the second dielectric layer modulus is between 0.15 and 0.55,

[0037] - the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the third dielectric layer modulus is between 0.55 and 1.55,

[0038] - the ratio of the optical thickness of the second dielectric layer modulus to the optical thickness of the third dielectric layer modulus is between 2.15 and 2.85.

[0039] Preferably, the optical thickness of the first dielectric layer modulus is from 30 nm to 100 nm, the optical thickness of the second dielectric layer modulus is from 150 nm to 200 nm, and the optical thickness of the third dielectric layer modulus is from 50 nm to 100 nm.

[0040] Furthermore, according to the invention, each dielectric layer module contains an optically high-refractive-index anti-reflective layer with a refractive index of more than 2.1.

[0041] The refractive index is specified within the scope of the present invention with reference to a wavelength of 550 nm, unless explicitly stated otherwise. The refractive index is fundamentally independent of the measurement method. It can be determined, for example, by ellipsometry. Ellipsometers are commercially available, for example from Sentech. Saint-Gobain Sekurit France 2024326- WO- PCT

[0042] Unless otherwise specified, layer thicknesses or thicknesses refer to the geometric thickness of a layer. If optical thickness is meant instead, this will be explicitly stated. The optical thickness within the meaning of the invention is the product of the geometric thickness and the refractive index at 550 nm. The ratio of the (optical) thickness of a first layer (sequence) to the (optical) thickness of a second layer (sequence) is calculated as the quotient of the (optical) thickness of the first layer (sequence) divided by the (optical) thickness of the second layer (sequence).

[0043] The inventors have recognized that an IR-reflective coating with the features of the invention gives the laminated glass a very pleasant, and in particular neutral, reflection color. Furthermore, the reflection color does not depend significantly on the viewing angle. This ensures a pleasing aesthetic impression of the laminated glass for the observer. In addition, the coating gives the laminated glass effective shielding properties against the IR components of solar radiation, thus significantly improving thermal comfort in the interior. These are major advantages of the present invention.

[0044] The laminated glass has an outer reflective color characterized in the Lab color space by a* values ​​in the range of -2.0 to 0.5, preferably from -1.25 to 0.25, and b* values ​​in the range of -5.0 to 0.0, preferably from -2.5 to -1.25. This corresponds to a neutral to slightly bluish outer reflective color, which is typically desired by vehicle manufacturers. The specified a* and b* values ​​refer to both a viewing angle of 8° and a viewing angle of 60°. A change in the viewing angle is therefore accompanied by at most a slight change in the reflective color, which is aesthetically pleasing. Curved laminated glass, in particular, where the viewing angle varies locally due to the curvature of the glass, thus exhibit a comparatively homogeneous color appearance. These reflective colors are achieved with the IR-reflective coating according to the invention.The specified value ranges refer specifically to a laminated glass unit with a clear outer pane of soda-lime glass with a thickness of 2.1 mm and a light transmission of 91%, an intermediate layer of tinted PVB film with a thickness of 0.76 mm and a light transmission of 4%, and a tinted inner pane of soda-lime glass with a thickness of 1.6 mm and a light transmission of 82%, wherein the IR-reflective coating is applied to the interior surface of the outer pane and the laminated glass unit has no other coatings. The exterior reflection color is measured by irradiating the exterior surface of the outer pane with a standard D65 light source at an angle of 8° and 60° (to the surface normal; angle of incidence and viewing angle), using a 10° detector.

[0045] The laminated glass preferably has a TTS value of less than 25%, more preferably less than 22%, and a RE value of more than 32%, more preferably more than 35%. The laminated glass preferably has an integrated external reflectance of less than 15%, more preferably less than 13%. These specifications also refer in particular to a laminated glass with a clear outer pane made of soda-lime glass with a thickness of 2.1 mm and a light transmission of 91%, an intermediate layer of a tinted PVB film with a thickness of 0.76 mm and a light transmission of 4%, and a tinted inner pane made of soda-lime glass with a thickness of 1.6 mm and a light transmission of 82%, wherein the IR-reflective coating is arranged on the inner surface of the outer pane and the laminated glass has no further coatings.

[0046] The TTS value describes the total solar energy received and is measured according to ISO 13837 (Convention A, wind speed 4 m / s). The RE value describes the energy reflection and is measured according to ISO 9050 with an assumed air mass of 1.5. The integrated external reflectance refers to the spectral range from 380 nm to 780 nm, measured at an angle of 8° (to the surface normal) with illuminant A and a 2° detector (the 2° indicates the angle at which the light ray strikes the retina in the eye). The integral reflectance is determined by recording a reflection spectrum at an angle of 8° (angle of incidence = angle of reflection = 8°), multiplying the reflection spectrum by the spectrum of the light source (illuminant A) and the eye's sensitivity curve (for 2°, daytime vision), and then integrating over the relevant spectral range (380 nm to 780 nm).The reflection spectrum is recorded with a measuring device without considering the light source used. For this purpose, a calibration is performed, whereby the measured value with the light source switched off corresponds to a value of 0 for all wavelengths, and the measured value with the light source switched on corresponds to a value of 1 for all wavelengths. The reflection spectrum is then measured with the standardized or calibrated measuring device, which then yields a standardized reflectance for each wavelength. The spectrum of illuminant A and the eye sensitivity curve, which are multiplied by the reflection spectrum, are standardized, with the maximum in each case corresponding to a value of 1. Saint-Gobain Sekurit France 2024326- WO-PCT.

[0047] In an advantageous embodiment, the first silver layer and the second silver layer have a thickness of 7 nm to 14 nm, preferably 8 nm to 13 nm. This achieves particularly good results.

[0048] In an advantageous embodiment, the ratio of the thickness of the first silver layer to the thickness of the second silver layer is from 0.45 to 2.2, preferably from 0.9 to 2.0, particularly preferably from 1.0 to 1.8, and most preferably from 1.2 to 1.6. This achieves particularly good results.

[0049] In an advantageous embodiment, it amounts to

[0050] - the optical thickness of the first dielectric layer modulus from 50 nm to 90 nm, preferably from 65 nm to 85 nm,

[0051] - the optical thickness of the second dielectric layer modulus from 155 nm to 190 nm, preferably from 160 nm to 180 nm,

[0052] - the optical thickness of the third dielectric layer modulus of 60 nm to 90 nm, preferably of 65 nm to 85 nm, particularly of 65 nm to 75 nm.

[0053] This leads to particularly good results.

[0054] In an advantageous embodiment, it amounts to

[0055] - the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the second dielectric layer modulus of 0.2 to 0.5, preferably of 0.4 to 0.5,

[0056] - the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the third dielectric layer modulus of 0.6 to 1.5, preferably of 0.9 to 1.3, in particular of 0.9 to 1.1 ,

[0057] - the ratio of the optical thickness of the second dielectric layer modulus to the optical thickness of the third dielectric layer modulus of 2.2 to 2.7, preferably of 2.2 to 2.6, in particular of 2.2 to 2.4.

[0058] All layers of the dielectric layer modules preferably have a refractive index of at least 1.8, particularly preferably at least 1.9.

[0059] Each dielectric layer module contains an antireflection module, which is formed by one or more directly successive dielectric antireflection layers. The antireflection modules reduce the reflection of visible light and thus increase the transparency of the coated disc. Saint-Gobain Sekurit France 2024326- WO- PCT

[0060] According to the invention, each anti-reflective module contains an optically high-refractive-index anti-reflective coating with a refractive index greater than 2.1 (or greater than 2.10). Such anti-reflective coatings can, for example, be based on silicon-metal mixed nitride (e.g., silicon zirconium nitride, silicon hafnium nitride, or silicon titanium nitride), titanium oxide, silicon carbide, manganese oxide, tungsten oxide, niobium oxide, zirconium nitride, or aluminum nitride. The refractive index is, for example, between 2.10 and 2.30. Silicon zirconium nitride is particularly preferred because of its good deposition rates and optical properties.

[0061] In an advantageous embodiment, the first dielectric layer module and the third dielectric layer module each contain an optically high-refractive-index antireflective coating with a refractive index of at least 2.3 (or at least 2.30, respectively), preferably from 2.30 to 2.60. Such antireflective coatings are preferably based on silicon-metal mixed nitride (for example, silicon zirconium nitride, silicon hafnium nitride, or silicon titanium nitride), titanium oxide or silicon carbide, manganese oxide, tungsten oxide, niobium oxide, zirconium nitride, or aluminum nitride, and particularly preferably on silicon-metal mixed nitride (for example, silicon zirconium nitride, silicon hafnium nitride, or silicon titanium nitride), titanium oxide, or silicon carbide. Silicon zirconium nitride is also particularly preferred in this respect. The higher refractive index results in particular from a higher proportion of zirconium.It has been shown that the desired neutral and angle-independent reflection color can be achieved with thicker silver layers, which is advantageous in terms of the stability of the silver layers and their IR-reflecting effect. Furthermore, the optical properties, especially the reflection color, are less susceptible to slight changes in layer thickness. The refractive index of the aforementioned materials can be adjusted within certain limits, both by modifying the stoichiometry and by doping.

[0062] The anti-reflective modulus can be formed solely by the aforementioned high-refractive-index anti-reflective coating. However, in an advantageous embodiment, each anti-reflective modulus also includes a dielectric layer with a refractive index of at most 2.1 (or at most 2.10), preferably from 1.90 to 2.10. This is advantageous with regard to a lower surface resistance of the IR-reflecting coating while maintaining high transmission and high color neutrality. Such anti-reflective coatings are preferably based on silicon nitride or tin oxide. Silicon nitride is particularly preferred due to its good deposition properties, easy availability, and excellent barrier effect against the diffusion of alkali ions from the glass sheet into the coating.

[0063] In a preferred embodiment, the optical thickness is

[0064] - of the antireflection modulus of the first dielectric layer modulus from 20 nm to 70 nm, preferably from 25 nm to 45 nm,

[0065] - of the antireflection modulus of the second dielectric layer modulus from 80 nm to 170 nm, preferably from 85 nm to 125 nm,

[0066] - of the antireflection modulus of the third dielectric layer modulus from 30 nm to 70 nm, preferably from 35 nm to 55 nm, particularly preferably from 40 nm to 50 nm.

[0067] The proportion of the aforementioned optically high-refractive anti-reflective coating with a refractive index of more than 2.1 or at least 2.3

[0068] - the optical thickness of the antireflection modulus of the first dielectric layer modulus is preferably from 0.3 to 0.8, particularly preferably from 0.4 to 0.7, most preferably from 0.4 to 0.6,

[0069] - the optical thickness of the antireflection modulus of the second dielectric layer modulus is preferably from 0.1 to 1.0, particularly preferably from 0.1 to 0.5, most preferably from 0.1 to 0.3,

[0070] - the optical thickness of the antireflection modulus of the third dielectric layer modulus is preferably from 0.1 to 0.8, particularly preferably from 0.3 to 0.7, most preferably from 0.3 to 0.6, in particular from 0.3 to 0.5 or from 0.4 to 0.6.

[0071] It is possible that a dielectric layer sequence contains more than one optically high-refractive-index antireflective layer, for example, an optically high-refractive-index antireflective layer with a refractive index between 2.10 and 2.30 and an optically high-refractive-index antireflective layer with a refractive index of at least 2.30. Information regarding the optical thickness of the optically high-refractive-index antireflective layer within the scope of the present invention then refers to the entirety of the optically high-refractive-index antireflective layers.

[0072] It is also possible that a layer of an anti-reflective coating is divided into two sublayers. These are layers of the same material with at least one layer of a different material positioned between them. Based on their optical properties, such sublayers of the same material are classified within the same Saint-Gobain Sekurit France 2024326- WO-PCT

[0073] The anti-reflective module is understood to be an anti-reflective layer. Specifications regarding the thickness of anti-reflective layers within the scope of the present invention therefore refer to the entirety of such anti-reflective layers of the same material. More precisely, each layer module contains at least one optically high-refractive-index anti-reflective layer, and the specifications refer to the entirety of the optically high-refractive-index anti-reflective layers; the optical thickness, for example, refers to the sum of the optical thicknesses of all optically high-refractive-index anti-reflective layers.

[0074] The dielectric layer modules can contain additional dielectric layers besides the anti-reflective modules, with preferred layers being presented below. The proportion of said optically high-refractive-index end-reflective layers with a refractive index of more than 2.1 or at least 2.3 is [not specified in the original text].

[0075] - the optical thickness of the first layer modulus is preferably from 0.1 to 0.4, particularly preferably from 0.2 to 0.3,

[0076] - the optical thickness of the second layer modulus is preferably from 0.1 to 0.6, particularly preferably from 0.1 to 0.2,

[0077] - the optical thickness of the third layer modulus is preferably from 0.1 to 0.5, particularly preferably from 0.3 to 0.4.

[0078] In an advantageous embodiment, each dielectric layer module arranged below a silver layer has an upper matching layer. The upper matching layer is arranged above the anti-reflective module, i.e., between the anti-reflective module and the silver layer deposited directly above the layer module. Preferably, the upper matching layer is located directly below the silver layer. This is particularly advantageous with regard to the crystallinity of the electrically conductive silver layer. Optionally, however, a thin metallic blocking layer can be present between the silver layer and the upper matching layer.

[0079] In an advantageous embodiment, each dielectric layer module arranged above a silver layer has a lower matching layer. The lower matching layer is preferably arranged below the anti-reflective module, i.e., between the anti-reflective module and the silver layer on which the layer module is deposited. Thus, each silver layer is preferably arranged between the upper matching layer of the layer module below and the lower matching layer of the layer module above. Saint-Gobain Sekurit France 2024326- WO- PCT

[0080] The matching layers preferably have a refractive index of 1.90 to 2.10.

[0081] The thicknesses of the upper matching layer and the lower matching layer are preferably from 3 nm to 20 nm, particularly preferably from 5 nm to 15 nm, and most preferably from 8 nm to 14 nm.

[0082] The upper and lower adaptation layers improve the coating's surface resistance. These layers preferably contain zinc oxide (ZnOi-Δn) with Δn < Δn < 0.01. The zinc oxide is preferably deposited substoichiometrically with respect to oxygen to prevent a reaction of excess oxygen with the silver layer. The zinc oxide preferably has a refractive index of about 2.0 (particularly about 2.00).

[0083] In an advantageous embodiment, each dielectric layer module arranged below a silver layer has a smoothing layer. The smoothing layer is arranged above the anti-reflective module and preferably between the anti-reflective module and the upper matching layer, if one is present. The smoothing layer is particularly preferably in direct contact with the upper matching layer. The smoothing layer optimizes, in particular smooths, the surface for a silver layer subsequently applied above it. A silver layer deposited on a smoother surface exhibits a higher transmittance with a simultaneously lower surface resistance.

[0084] The smoothing layers preferably have a refractive index of 1.90 to 2.10.

[0085] The thickness of the smoothing layers is preferably from 5 nm to 20 nm, particularly preferably from 7 nm to 13 nm.

[0086] The smoothing layer preferably contains at least one non-crystalline oxide. The oxide can be amorphous or partially amorphous (and thus partially crystalline), but is not fully crystalline. The non-crystalline smoothing layer has low roughness and thus forms an advantageously smooth surface for the layers to be applied above the smoothing layer. The non-crystalline smoothing layer further improves the surface structure of the layer deposited directly above the smoothing layer, which is preferably the upper matching layer. The smoothing layer can, for example, contain at least one oxide of one or more of the elements tin, silicon, titanium, zirconium, hafnium, zinc, gallium, and Saint-Gobain Sekurit France 2024326-WO-PCT

[0087] The smoothing layer contains indium. It particularly preferably contains a non-crystalline mixed oxide. The smoothing layer most preferably contains a tin-zinc mixed oxide (SnZnO). The mixed oxide preferably has a substoichiometric oxygen content. The tin content is preferably between 10 and 40 wt.%, particularly preferably between 12 and 35 wt.%. The tin-zinc mixed oxide preferably has a refractive index of about 2.05.

[0088] In an advantageous embodiment, the IR-reflective coating comprises one or more blocker layers. Preferably, at least one, and more preferably each, silver layer is assigned at least one blocker layer. The blocker layer is in direct contact with the silver layer and is arranged directly above or directly below it. No further layer is arranged between the silver layer and the blocker layer. Alternatively, a blocker layer can be arranged directly above and directly below each silver layer. However, a single blocker layer directly above each silver layer is preferred – this is sufficient and particularly effective for protecting the silver layer. The blocker layer preferably contains niobium, titanium, nickel, chromium, and / or alloys thereof, particularly nickel-chromium alloys.The thickness of the blocker layer is preferably from 0.1 nm to 1 nm, particularly preferably from 0.1 nm to 0.5 nm. A blocker layer directly below the silver layer serves in particular to stabilize the silver layer during heat treatment and improves the optical quality of the IR-reflecting coating. A blocker layer directly above the silver layer prevents contact between the sensitive silver layer and the oxidizing reactive atmosphere during the deposition of the subsequent layer by reactive cathode sputtering, for example, the lower matching layer.

[0089] The layers of the IR-reflecting coating, in particular the dielectric layers, may contain dopants, especially aluminum, boron, antimony, zirconium, or titanium. These dopants can impart a certain electrical conductivity to materials that are inherently dielectric. However, a person skilled in the art will still recognize them as dielectric layers with regard to their function, as is common practice in the field of thin films. The material of the dielectric layers preferably has an electrical conductivity (inverse of the resistivity) of less than 10⁻⁶. 4 S / m. The material of the electrically conductive layers preferably has an electrical conductivity greater than 10. 4 S / m on. Saint-Gobain Sekurit France 2024326- WO- PCT

[0090] The oxides, nitrides and carbides mentioned in this description can be deposited stoichiometrically, substoichiometrically or superstoichiometrically with respect to oxygen, nitrogen or carbon content.

[0091] The inventors have recognized that a comparatively high ratio of the sum of the geometric thicknesses of the oxide dielectric layers ("total oxide thickness") to the sum of the geometric thicknesses of the nitride dielectric layers ("total nitride thickness") of the IR-reflecting coating is advantageous for the bendability of the coating. This ratio of total oxide thickness to total nitride thickness is preferably at least 0.6 (for example, from 0.6 to 1.0), particularly preferably at least 0.7 (for example, from 0.7 to 1.0), most preferably at least 0.8 (for example, from 0.8 to 1.0), and particularly preferably at least 0.9 (for example, from 0.9 to 1.0). The coating can then advantageously be applied to a flat disc and bent along with this disc without the formation of cracks or haze in the coating.The oxide layers are preferably the matching layers (especially based on zinc oxide) and the smoothing layers (especially based on tin-zinc mixed oxide). The nitride layers are preferably the optically high-refractive-index antireflective layers (especially based on silicon-metal mixed nitride such as silicon-zirconium nitride) and the dielectric layers with a refractive index of at most 2.1 (especially based on silicon nitride).

[0092] A particularly preferred embodiment is characterized by the fact that

[0093] - the first dielectric layer module o an antireflection module comprising a dielectric layer with a refractive index of at most 2.1 and an optically high-refractive-index antireflection layer with a refractive index of more than 2.1, preferably at least 2.3, o a smoothing layer, o an upper matching layer,

[0094] - the second dielectric layer module o a lower matching layer, o an antireflection module comprising a dielectric layer with a refractive index of not more than 2.1 and an optically high refractive index antireflection layer with a refractive index of more than 2.1 , o a smoothing layer, Saint-Gobain Sekurit France 2024326- WO-PCT o an upper matching layer,

[0095] - the third dielectric layer module o a lower matching layer, o an antireflection module comprising an optically high refractive index antireflection layer with a refractive index of more than 2.1, preferably at least 2.3, and a dielectric layer with a refractive index of at most 2.1, each in the specified order in a direction starting from the surface on which the coating is deposited (i.e., “from bottom to top”).

[0096] The materials and thicknesses of the individual layers are as described above. The smoothing layers preferably have a refractive index of 1.90 to 2.10 and are particularly preferably based on tin-zinc mixed oxide. The matching layers preferably have a refractive index of 1.90 to 2.10 and are particularly preferably based on zinc oxide. The dielectric layers with a refractive index of at most 2.1 preferably have a refractive index of 1.90 to 2.10 and are particularly preferably based on silicon nitride. The dielectric layers with a refractive index greater than 2.1 preferably have a refractive index between 2.10 and 2.30 and are particularly preferably based on silicon-metal mixed nitride, especially silicon-zirconium nitride.The dielectric layers with a refractive index of at least 2.3 preferably have a refractive index of 2.30 to 2.60 and are particularly preferably based on silicon-metal mixed nitride (especially silicon-zirconium nitride), titanium oxide or silicon carbide.

[0097] The order of the individual layers within the anti-reflective modules is, in principle, arbitrary. However, it may be preferred if, in all anti-reflective modules of layer modules arranged below a silver layer, the anti-reflective layer with the lower refractive index is arranged below the one with the higher refractive index, and conversely, in the anti-reflective module of the uppermost layer module, the anti-reflective layer with the lower refractive index is arranged above the one with the higher refractive index.

[0098] Optionally, the top layer module can include a top layer, which in particular improves the scratch resistance of the coating during the manufacture of Saint-Gobain Sekurit France 2024326- WO-PCT

[0099] Improved composite disc. Such a cover layer is preferably based on titanium zirconium oxide, zirconium oxide, or silicon zirconium oxide, alternatively on carbon or a titanium-zirconium-hafnium alloy. The cover layer preferably has a thickness of 2 nm to 10 nm, particularly preferably 3 nm to 5 nm.

[0100] The IR-reflective coating can, in principle, comprise further layers. In preferred embodiments, however, the coating consists only of the layers described here and has no further layers. In a particularly preferred embodiment, the uppermost layer module has the aforementioned top layer. In another particularly preferred embodiment, the uppermost layer module does not have the aforementioned top layer, which is advantageous with regard to a simple layer structure and cost-effective manufacturing.

[0101] In a particularly preferred embodiment, the IR-reflective coating comprises exactly two silver layers and three layer modules. The IR-reflective coating does not include any further silver layers or dielectric layer modules. The number n is therefore exactly 2. Starting from the surface on which the coating is applied (the inner surface of the outer pane or the outer surface of the inner pane), the IR-reflective coating thus consists of the following components in the specified order:

[0102] - the first dielectric layer module,

[0103] - the first layer of silver,

[0104] - the second dielectric layer module,

[0105] - the second silver layer,

[0106] - the third dielectric layer module.

[0107] It has been shown that IR-reflective coatings with exactly two silver layers are more stable with regard to their reflection color against slight variations in layer thickness, which are unavoidable in industrial mass production. The desired reflection color can therefore be achieved with greater reliability.

[0108] The above general statements apply with regard to geometric and optical layer thicknesses and materials.

[0109] Table 1 summarizes the optical layer thicknesses of the dielectric layer modules and the geometric layer thicknesses of the silver layers and blocker layers for six particularly preferred embodiments of Saint-Gobain Sekurit France 2024326-WO-PCT. The layers are listed in order of increasing distance from the surface on which the coating is deposited, in each case in nanometers.

[0110] Table 1

[0111] These configurations are particularly preferred and achieve especially good results, with the thicknesses of the silver layers corresponding to the specified geometric layer thicknesses plus / minus ( + / .) 1 nm, preferably 0.5 nm, and the optical thicknesses of the dielectric layer modules correspond to the specified optical layer thicknesses plus / minus ( + 20 nm, preferably 10 nm, particularly preferably 5 nm. The notation "plus / minus (+ / -)" indicates a thickness range or interval of possible thicknesses. A layer with a thickness of x + / - y nm has a thickness that lies in the range of (x- y) nm to (x+y) nm.

[0112] In particularly preferred embodiments, the aforementioned embodiments 1-6 are each realized by a sequence of individual layers and anti-reflective modules, as summarized in Table 2. The geometric layer thicknesses are given, except for the anti-reflective modules and the layers upon which they are built, for which the optical layer thicknesses are given. The layers are listed in order of increasing distance from the surface on which the coating is deposited, in nanometers. The material on which the respective layer is based is given in square brackets (except for the anti-reflective modules). However, other materials with the same refractive index can also be used. Saint-Gobain Sekurit France 2024326- WO-PCT

[0113] Table 2

[0114] The thicknesses of the silver layers correspond to the specified geometric layer thicknesses plus / minus ( + / .) 1 nm, preferably 0.5 nm. The geometric thicknesses of the dielectric layers correspond to the specified geometric layer thicknesses plus / minus ( + / .) 5 nm, preferably 2 nm, particularly preferably 1 nm. The optical thicknesses of the antireflection modules and the optically high-refractive-index layers correspond to the specified optical layer thicknesses plus / minus ( + 10 nm, preferably 5 nm.

[0115] In particularly preferred embodiments, the aforementioned embodiments 1-6 are each realized by a sequence of individual layers as summarized in Table 3. The geometric layer thicknesses are given in each case. The layers are listed in order of increasing distance from the surface on which the Saint-Gobain Sekurit France 2024326-WO-PCT coating is deposited, in each case in nanometers. The material on which the respective layer is based is given in square brackets. In principle, however, other materials with the same refractive index can also be used.

[0116] The thicknesses of the silver layers correspond to the specified geometric layer thicknesses plus / minus ( + / .) 1 nm, preferably 0.5 nm. The thicknesses of the dielectric layers correspond to the specified geometric layer thicknesses plus / minus ( +5 nm, preferably 2 nm, particularly preferably 1 nm.

[0117] The order of the anti-reflective layers within the individual anti-reflective modules can also be reversed. It is also conceivable that an anti-reflective layer is divided into several sub-layers of the same material, where the sum of the thicknesses of the sub-layers corresponds to the thickness specified here.

[0118] Regarding the materials, SiN stands for silicon nitride (refractive index especially around 2.0), ZnO for zinc oxide (refractive index especially around 2.0), SnZnO for tin-zinc mixed oxide (refractive index especially around 2.05), SiZrN 2 2 for silicon zirconium nitride with a refractive index of approximately 2.2 and SiZrN 2 4 for silicon zirconium nitride with a refractive index of approximately 2.4.

[0119] An optional topcoat layer can be present above the uppermost dielectric anti-reflective layer, preferably based on titanium zirconium oxide, zirconium oxide, silicon zirconium oxide, carbon, or a titanium-zirconium-hafnium alloy with a layer thickness of 2 nm to 10 nm, and particularly preferably based on titanium zirconium oxide with a layer thickness of 3 nm to 5 nm. In a preferred embodiment, however, no topcoat layer is present, and the coating consists only of the layers specified. Saint-Gobain Sekurit France 2024326-WO-PCT

[0120] Table 3 Saint-Gobain Sekurit France 2024326-WO-PCT

[0121] In an alternative preferred embodiment, the IR-reflecting coating between the first dielectric layer modulus and the first silver layer also comprises, in the specified order starting from the first dielectric layer modulus:

[0122] - another layer of silver,

[0123] - another dielectric layer module.

[0124] The IR-reflective coating preferably comprises exactly three silver layers and four layer modules. The number n is therefore exactly 3. Starting from the surface on which the coating is applied (the inner surface of the outer pane or the outer surface of the inner pane), the IR-reflective coating consists of the following components in the specified order:

[0125] - the first dielectric layer module,

[0126] - the further silver layer,

[0127] - the further dielectric layer module,

[0128] - the first layer of silver,

[0129] - the second dielectric layer module,

[0130] - the second silver layer,

[0131] - the third dielectric layer module.

[0132] The advantage of an IR-reflective coating with three silver layers lies in its improved IR-reflective effect, because more silver can be present for the same transparency. This results in higher energy reflection and a lower TTS value.

[0133] The additional silver layer preferably has a thickness of 6 nm to 16 nm, particularly preferably 7 nm to 12 nm, and most preferably 8 nm to 10 nm. The additional silver layer is preferably thinner than the first and second silver layers. The ratio of the thickness of the first silver layer to the thickness of the additional silver layer is preferably between 1.0 and 2.0, and particularly preferably between 1.0 and 1.5. The ratio of the thickness of the second silver layer to the thickness of the additional silver layer is also particularly preferably within these ranges. This results in particularly good results.

[0134] The optical thickness of the additional dielectric layer modulus is preferably from 100 nm to 150 nm, particularly preferably from 120 nm to 140 nm. The optical thickness of the additional layer modulus is preferably greater than the optical thickness of the first and third layer moduli and less than the optical thickness of the second layer modulus. Saint-Gobain Sekurit France 2024326- WO- PCT

[0135] In an advantageous embodiment, this amounts to

[0136] - the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the further dielectric layer modulus of 0.3 to 0.8, preferably of 0.4 to 0.6, in particular of 0.45 to 0.55,

[0137] - the ratio of the optical thickness of the second dielectric layer modulus to the optical thickness of the further dielectric layer modulus of 1.1 to 1.5, preferably of 1.2 to 1.4, in particular of 1.25 to 1.35,

[0138] - the ratio of the optical thickness of the third dielectric layer modulus to the optical thickness of the further dielectric layer modulus of 0.3 to 0.8, preferably of 0.4 to 0.6, in particular of 0.45 to 0.55.

[0139] The further dielectric layer module also includes an antireflection module with at least one optically high-refractive-index antireflection layer having a refractive index of more than 2.1, preferably between 2.10 and 2.30, or with a refractive index of at least 2.3, preferably from 2.3 to 2.6. The antireflection module preferably also includes a dielectric layer with a refractive index of at most 2.1, preferably from 1.90 to 2.10. The above descriptions regarding suitable materials apply in connection with the first to third layer modules.

[0140] The optical thickness of the antireflection modulus of the further dielectric layer module is preferably from 50 nm to 100 nm, particularly preferably from 60 nm to 80 nm. The proportion of said at least one optically high-refractive-index antireflection layer to the optical thickness of the antireflection modulus of the further layer module is preferably from 0.4 to 1.0, particularly preferably from 0.5 to 0.9, particularly preferably from 0.6 to 0.8.

[0141] The further dielectric layer module preferably also comprises a lower matching layer below the antireflection layer, an upper matching layer above the antireflection layer, and a smoothing layer between the antireflection layer and the upper matching layer. Regarding suitable materials and layer thicknesses, the above description applies in connection with the first to third layer modules. The proportion of said at least one optically high-refractive-index antireflection layer to the optical thickness of the further layer module is preferably from 0.4 to 0.8, and particularly preferably from 0.5 to 0.7.

[0142] Regarding the geometric and optical layer thicknesses and materials of the first and second silver layers and the first, second, and third optical layer modules of Saint-Gobain Sekurit France 2024326-WO-PCT, the above general statements apply. Furthermore, the following configurations are particularly preferred in the variant with three silver layers:

[0143] - The thickness of the first and second silver layers is preferably from 9 to 11 nm.

[0144] - The ratio of the thickness of the first silver layer to the thickness of the second silver layer is preferably from 0.9 to 1.2.

[0145] - The optical thickness of the first dielectric layer modulus is preferably from 60 nm to 80 nm, that of the second layer modulus from 155 nm to 175 nm, that of the third layer modulus from 55 nm to 75 nm.

[0146] - The ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the second dielectric layer modulus is preferably from 0.3 to 0.5, the ratio of the optical thickness of the first dielectric layer modulus to the optical thickness of the third dielectric layer modulus is preferably from 1.0 to 1.2 and the ratio of the optical thickness of the second dielectric layer modulus to the optical thickness of the third dielectric layer modulus is preferably from 2.5 to 2.7.

[0147] - The proportion of the optically high-refractive-index anti-reflective layer to the optical thickness of the anti-reflective modulus of the first layer module is preferably from 0.2 to 0.4, to the optical thickness of the anti-reflective modulus of the second layer module preferably from 0.1 to 0.3, and to the optical thickness of the anti-reflective modulus of the third layer module preferably from 0.3 to 0.5.

[0148] In a particularly preferred embodiment, the IR-reflecting coating in the variant with three silver layers comprises, starting from the surface on which the coating is deposited, in the following order:

[0149] - the first layer module with an optical thickness of 68 nm, 7.20 nm, preferably 7.10 nm, particularly preferably 7.5 nm,

[0150] - the further silver layer with a thickness of 8.7 nm 7.1 nm, preferably 7.05 nm,

[0151] - a blocker layer with a thickness of 0.1 to 0.2 nm,

[0152] - the further layer modulus with an optical thickness of 128 nm, 7.20 nm, preferably 7.10 nm, particularly preferably 7.5 nm,

[0153] - the first silver layer with a thickness of 10.8 nm 7.1 nm, preferably 7.05 nm,

[0154] - a blocker layer with a thickness of 0.1 to 0.2 nm,

[0155] - the second layer module with an optical thickness of 164 nm, 7.20 nm, preferably 7.10 nm, particularly preferably 7.5 nm,

[0156] - the second silver layer with a thickness of 10.5 nm 7.1 nm, preferably 7.0.5 nm,

[0157] - a blocker layer with a thickness of 0.1 to 0.2 nm, Saint-Gobain Sekurit France 2024326- WO- PCT

[0158] - the third layer module with an optical thickness of 63 nm + / 20 nm, preferably + / 10 nm, particularly preferred + / . 5 nm.

[0159] In a particularly preferred embodiment, this embodiment is realized by the following sequence of individual layers and anti-reflective modules, in the specified order starting from the surface on which the coating is deposited:

[0160] - Anti-reflective module with an optical thickness of 32.4 nm, of which an optically high-refractive-index anti-reflective layer with an optical thickness of 22.4 nm,

[0161] - Smoothing layer with a thickness of 8 nm, preferably based on SnZnO,

[0162] - upper matching layer with a thickness of 10 nm, preferably based on ZnO,

[0163] - another silver layer with a thickness of 8.7 nm,

[0164] - Blocker layer with a thickness of 0.1 to 0.2 nm,

[0165] - lower matching layer with a thickness of 10 nm, preferably based on ZnO,

[0166] - Anti-reflective module with an optical thickness of 71.6 nm, of which an optically high-refractive-index anti-reflective layer with an optical thickness of 51.6 nm,

[0167] - Smoothing layer with a thickness of 8 nm, preferably based on SnZnO,

[0168] - upper matching layer with a thickness of 10 nm, preferably based on ZnO,

[0169] - first silver layer with a thickness of 10.8 nm + / 1 nm, preferably + / . 0.5 nm,

[0170] - Blocker layer with a thickness of 0.1 to 0.2 nm,

[0171] - lower matching layer with a thickness of 10 nm, preferably based on ZnO,

[0172] - Anti-reflective module with an optical thickness of 107.4 nm, including an optically high-refractive-index anti-reflective layer with an optical thickness of 22.2 nm,

[0173] - Smoothing layer with a thickness of 8 nm, preferably based on SnZnO,

[0174] - upper matching layer with a thickness of 10 nm, preferably based on ZnO,

[0175] - second silver layer with a thickness of 10.5 nm,

[0176] - Blocker layer with a thickness of 0.1 to 0.2 nm,

[0177] - lower matching layer with a thickness of 10 nm, preferably based on ZnO,

[0178] - Anti-reflective module with an optical thickness of 43.2 nm, of which an optically high-refractive-index anti-reflective layer with an optical thickness of 24.0 nm.

[0179] The geometric layer thicknesses are specified in each case, except for the anti-reflective modules and the layers that make them up, for which the optical layer thicknesses are given. The thicknesses of the silver layers correspond to the specified geometric layer thicknesses plus / minus ( + / .) 1 nm, preferably 0.5 nm. The geometric thicknesses of the dielectric layers correspond to the specified Saint-Gobain Sekurit France 2024326- WO- PCT geometric layer thicknesses plus / minus ( + / .) 5 nm, preferably 2 nm, particularly preferably 1 nm. The optical thicknesses of the antireflection modules and the optically high-refractive-index layers correspond to the specified optical layer thicknesses plus / minus (+ 10 nm, preferably 5 nm.

[0180] An optional topcoat layer can be present above the uppermost dielectric anti-reflective layer, preferably based on titanium zirconium oxide, zirconium oxide, silicon zirconium oxide, carbon, or a titanium-zirconium-hafnium alloy with a layer thickness of 2 nm to 10 nm, and particularly preferably based on titanium zirconium oxide with a layer thickness of 3 nm to 5 nm. In a preferred embodiment, however, no topcoat layer is present, and the coating consists only of the layers specified.

[0181] In a particularly advantageous embodiment, an emissivity-reducing coating is arranged on the surface of the inner disc facing away from the intermediate layer, i.e., the interior surface of the inner disc. The emissivity-reducing coating comprises a layer based on a transparent conductive oxide (TCO).

[0182] Such an emissivity-reducing coating is typically a transparent stack of thin films. The emissivity-reducing coating preferably comprises at least one, and more preferably exactly one, electrically conductive layer, which provides the IR-reflective properties. The conductive layer is preferably based on a transparent conductive oxide (TCO), in particular indium tin oxide (ITO), alternatively indium zinc mixed oxide (IZO), gallium-doped tin oxide (GZO), fluorine-doped tin oxide (FTO, SnO₂:F), antimony-doped tin oxide (ATO, SnO₂:Sb), or niobium-doped titanium oxide (TiÜ₂:Nb). Unlike metals, TCOs are not susceptible to corrosion, so they can be used on the exposed inner surface of the inner disc.In addition to the conductive layer, the coating typically has dielectric layers (for example, based on silicon oxide or nitride), which serve in particular to optimize the optical properties (for example, light transmission) or to act as barrier layers to regulate oxygen diffusion during the deposition of the coating.

[0183] The outer and inner panes are preferably made of glass, in particular soda-lime glass, which is common for window panes. The panes can, in principle, be made of Saint-Gobain Sekurit France 2024326-WO-PCT, but also of other types of glass (for example, borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (for example, polymethyl methacrylate or polycarbonate). The thickness of the outer and inner panes can vary widely. Preferably, panes with a thickness in the range of 0.8 mm to 5 mm, more preferably from 1.2 mm to 3 mm, are used, for example, with the standard thicknesses of 1.6 mm or 2.1 mm.

[0184] The outer pane, the inner pane, and the thermoplastic interlayer can be clear and colorless, or tinted or colored. The outer pane and the inner panes can be independently unstressed, partially stressed, or stressed (thermally or chemically).

[0185] In a preferred embodiment, the outer pane is clear, which is advantageous with regard to effective reflection of IR radiation because sunlight is absorbed very little before it reaches the IR-reflecting coating. The intermediate layer and the inner pane are preferably tinted, particularly if the laminated pane is intended to have a comparatively low light transmission, for example, as a vehicle roof window. However, a tinted intermediate layer and a clear inner pane can also be used, for example.

[0186] The thermoplastic interlayer contains at least one thermoplastic polymer, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), or polyurethane (PU), or mixtures, copolymers, or derivatives thereof, particularly preferably PVB. The interlayer is typically formed from at least one thermoplastic film (bonding film), preferably based on one of the aforementioned polymers, especially PVB. The thickness of the interlayer is preferably from 0.2 mm to 2 mm, particularly preferably from 0.5 mm to 1 mm.

[0187] If a polymeric film or layer is formed on the basis of a material, this means, in the sense of the invention, that the film or layer contains predominantly the said material (proportion of greater than 50 wt.%) and may optionally contain further components, for example plasticizers, stabilizers, UV or IR absorbers.

[0188] The laminated glass pane has a transparent viewing area intended for seeing through. The laminated glass pane may also have an opaque masking area. Such masking areas are common, for example, in Saint-Gobain Sekurit France 2024326-WO-PCT vehicle windows (especially windshields, rear windows, and roof windows). The masking area is located around the perimeter and surrounds the central viewing area. The masking area is typically formed by an opaque coating printed on the surface of the outer and / or inner pane. This coating is typically made of an enamel containing glass frits and a pigment, which is screen-printed and then fired onto the glass surface. Alternatively, opaque films can be used in the interlayer.The IR-reflective coating preferably covers the entire transmission area (except for any local uncoated areas that act as data transmission windows to ensure the transmission of high-frequency radiation) and extends into the masking area. Preferably, the side edge of the IR-reflective coating is located within the masking area so that it is not visible.

[0189] The laminated glass is preferably curved in one or more spatial directions, as is common for automotive windshields, with typical radii of curvature ranging from approximately 10 cm to approximately 40 m. However, the laminated glass can also be flat, for example, when intended for use as building glazing or as a windshield for buses, trains, or tractors.

[0190] The composite pane according to the invention can be used as any window pane, for example as a window pane, door pane or facade glazing of a building or as a window pane of a vehicle. The composite pane according to the invention is preferably a vehicle pane, for example a windshield, roof pane, side window or rear window of a land, sea or air vehicle, particularly preferably a vehicle roof pane, especially the roof pane of a passenger car or truck.

[0191] The invention also comprises a method for manufacturing a composite disc according to the invention, wherein in the specified sequence

[0192] (a) the outer pane and the inner pane are provided,

[0193] (b) a surface of the outer pane or the inner pane is provided with the IR-reflective coating, Saint-Gobain Sekurit France 2024326- WO- PCT

[0194] (c) the outer pane and the inner pane are joined together via the thermoplastic intermediate layer, with said surface facing the intermediate layer.

[0195] The IR-reflective coating is typically applied from the gas phase (gas-phase deposition). The IR-reflective coating is preferably applied to the surface by physical vapor deposition (PVD), particularly preferably by sputtering, and most preferably by magnetron sputtering. However, the coating can also be applied, for example, by chemical vapor deposition (CVD), such as plasma-enhanced chemical vapor deposition (PECVD), by evaporation, or by atomic layer deposition (ALD).

[0196] If the laminated glass pane is to be curved, the outer and inner panes are preferably bent before lamination in process step (c) and preferably after coating in process step (b). Preferably, the outer and inner panes are bent congruently together while lying on top of each other (i.e., simultaneously and using the same tool), because this ensures that the shape of the panes is optimally matched for the subsequent lamination. Typical temperatures for glass bending processes are, for example, 500°C to 700°C. All standard bending methods can be used, such as gravity bending, press bending, and / or suction bending.

[0197] The coating is preferably subjected to a heat treatment, particularly preferably at a temperature of at least 300°C. This heat treatment increases the transparency and reduces the surface resistance of the IR-reflective coating. The heat treatment can be carried out as part of a bending process in which the coated disc is already heated to a high temperature.

[0198] The joining of the outer and inner panes in process step (c) is carried out by methods known per se. The outer and inner panes are laminated together via the intermediate layer, for example by autoclave processes, vacuum bag processes, vacuum ring processes, calender processes, vacuum laminators, or combinations thereof. The joining of the outer and inner panes is usually carried out under the influence of heat, vacuum, and / or pressure. Saint-Gobain Sekurit France 2024326- WO-PCT

[0199] The invention further comprises the use of a composite pane according to the invention in a building or a vehicle on land, water, or in the air, preferably a motor vehicle, rail vehicle, aircraft, or ship, in particular a passenger car or truck. The composite pane is preferably used as a vehicle window, especially preferably as a window pane of a passenger car or truck. The composite pane is used, for example, as a windshield, rear window, side window, or roof window, preferably as a roof window.

[0200] Saint-Gobain Sekurit France 2024326-WO-PCT

[0201] The invention is explained in more detail below with reference to a drawing and exemplary embodiments. The drawing is a schematic representation and not to scale. The drawing does not limit the invention in any way.

[0202] They show:

[0203] Fig. 1 shows a cross-section through a composite disk according to the invention,

[0204] Fig. 2 shows a cross-section through an IR-reflecting coating according to the invention on an outer disc and

[0205] Fig. 3 shows a cross-section through a further IR-reflecting coating according to the invention on an outer disc.

[0206] Figure 1 shows a cross-section of a composite pane according to the invention, which is intended and designed as a roof pane for a passenger car. The composite pane consists of an outer pane 1 and an inner pane 2, which are connected to each other via a thermoplastic intermediate layer 3. In its installed position, the outer pane 1 faces the external environment, and the inner pane 2 faces the vehicle interior.

[0207] The outer pane 1 has an outer surface I, which, when installed, faces the external environment, and an inner surface II, which, when installed, faces the interior. Similarly, the inner pane 2 has an outer surface III, which, when installed, faces the external environment, and an inner surface IV, which, when installed, faces the interior. The outer pane 1 and the inner pane 2 are made, for example, of soda-lime glass. The outer pane 1 has, for example, a thickness of 2.1 mm, and the inner pane 2 has a thickness of 1.6 mm. The intermediate layer 3 is, for example, made of a PVB film with a thickness of 0.76 mm.

[0208] The laminated glass pane is provided with an IR-reflective coating 20, which is applied to the interior surface II of the outer pane 1. The IR-reflective coating 20 is designed to reflect infrared components of solar radiation and thereby improve thermal comfort in the vehicle interior. The IR-reflective coating 20 is a thin-film stack with n silver layers and (n+1) dielectric layer modules arranged alternately, such that each silver layer is positioned between two dielectric layer modules. n is a natural number greater than or equal to 2, in particular 2 or 3.

[0209] The interior surface II of the outer pane 1 is also provided with a black masking print 4 around its perimeter, forming an opaque masking area. This masking area surrounds a central transparent viewing area of ​​the laminated pane like a frame. The IR-reflective coating 20 does not extend to the side edge of the laminated pane; its edge is located within the aforementioned masking area, and may be positioned above or below the masking print 4. The IR-reflective coating 20 has no contact with the surrounding atmosphere, thus protecting the corrosion-prone silver layers.

[0210] An emissivity-reducing coating 30 is applied to the interior surface IV of the inner pane 2. It comprises a functional layer based on indium tin oxide (ITO) and dielectric layers. The emissivity-reducing coating 30 reflects thermal radiation. In summer, it reduces the radiation of heat from the heated laminated pane into the interior, and in winter, it reduces the radiation of heat from the interior. The emissivity-reducing coating 30 thus contributes to a further improvement in thermal comfort in the interior.

[0211] Figure 2 shows the layer sequence of an embodiment of the IR-reflecting coating 20 according to the invention on the outer disk 1. The IR-reflecting coating 20 comprises three dielectric layer sequences M1, M2, M3 and two silver layers Ag1, Ag2. A thin blocker layer 26.1, 26.2 is arranged between each silver layer Ag1, Ag2 and the overlying dielectric layer sequence M2, M3.

[0212] The first dielectric layer sequence M 1 is composed of an antireflection module 22.1, a smoothing layer 23.1 and an upper matching layer 24.1.

[0213] The second dielectric layer sequence M2 consists of a lower matching layer 25.2, an antireflection module 22.2, a smoothing layer 23.2, and an upper matching layer 24.2. Saint-Gobain Sekurit France 2024326-WO-PCT

[0214] The third dielectric layer sequence M3 is composed of a lower matching layer.

[0215] 25.3 and an anti-reflective module 22.3.

[0216] The anti-reflective modules 22.1, 22.2, and 22.3 each consist of two anti-reflective layers. The first anti-reflective module 22.1 comprises a dielectric anti-reflective layer 22a.1 with a refractive index of at most 2.1 and an optically high-refractive-index anti-reflective layer 22c.1 with a refractive index of at least 2.3. The second anti-reflective module 22.2 comprises a dielectric anti-reflective layer 22a.2 with a refractive index of at most 2.1 and an optically high-refractive-index anti-reflective layer 22b.2 with a refractive index greater than 2.1. The third anti-reflective module 22.3 comprises an optically high-refractive-index anti-reflective layer 22c.3 with a refractive index of at least 2.3 and a dielectric anti-reflective layer 22a.3 with a refractive index of at most 2.1.

[0217] The layer sequence can be seen schematically in the figure. The layer sequence of a composite disc with such an IR-reflecting coating 20 on the inner surface II of the outer disc 1, together with the materials, refractive indices no (at 550 nm) and layer thicknesses of the individual layers, is shown in Table 4 for five examples 1 to 5 according to the invention. Here, Ag stands for silver, NiCr for a nickel-chromium alloy, SnZnO for tin-zinc mixed oxide, ZnO for zinc oxide, and SiN for silicon nitride. SiZr17N stands for a silicon-zirconium mixed nitride that was deposited in a nitrogen atmosphere with added argon using a silicon-zirconium target having a zirconium content of 17 wt.%. SiZr27N stands for a silicon-zirconium mixed nitride deposited in a nitrogen atmosphere with added argon using a silicon-zirconium target containing 27 wt.% zirconium.The SnZnO-based layers are doped with antimony, and the ZnO, SiN, or SiZrN-based layers with aluminum. Saint-Gobain Sekurit France 2024326-WO-PCT.

[0218] Table 4

[0219] The layer sequence of a composite pane with an IR-reflective coating 20 also according to the invention on the interior surface II of the outer pane

[0220] Figure 1, together with the materials, refractive indices no, and layer thicknesses of the individual layers, is shown in Table 5 for a further example 6 according to the invention. In contrast to the embodiment of Figure 2 and Table 4, the antireflection module 22.1 of the first dielectric layer module M1 has an optically high-refractive-index antireflection layer 22b.1 with a refractive index of more than 2.1 instead of the optically high-refractive-index antireflection layer 22c.1 with a refractive index of at least 2.3. The remaining layers correspond with respect to their material to Examples 1 to 5. Saint-Gobain Sekurit France 2024326-WO-PCT

[0221] Table 5

[0222] Figure 3 shows the layer sequence of a further embodiment of the IR-reflecting coating 20 according to the invention on the outer disk 1. The IR-reflecting coating 20 comprises four dielectric layer sequences M1, M2, M3, M4 and three silver layers Ag1, Ag2, Ag3. A thin blocker layer 26.1, 26.2, 26.3 is arranged between each silver layer Ag1, Ag2, Ag3 and the overlying dielectric layer sequence M2, M3, M4.

[0223] Compared to the configuration of Example 6 from Table 5, a further silver layer Ag3 and a further dielectric layer module M4 are arranged between the first dielectric layer module M1 and the first silver layer Ag1. The first, second, and third dielectric layer modules are structured identically to Example 6 with respect to the individual layers and their materials. Saint-Gobain Sekurit France 2024326-WO-PCT

[0224] Table 6 Saint-Gobain Sekurit France 2024326-WO-PCT

[0225] The further layer module M4 is composed of a lower matching layer 25.4, an antireflection module 22.4, a smoothing layer 23.4 and an upper matching layer 24.4. The antireflection module 22.4 is formed from four antireflection layers, namely a dielectric layer 22a.4 with a refractive index of at most 2.1, two optically high-refractive-index layers 22b.4, 22b.4' with a refractive index of more than 2.1 and an optically high-refractive-index layer 22c.4 with a refractive index of at least 2.3.

[0226] The layer sequence can be seen schematically in the figure. The layer sequence of a composite pane with such an IR-reflecting coating 20 on the inner surface II of the outer pane 1, together with the materials, refractive indices no and layer thicknesses of the individual layers, is shown in Table 6 for a further example 7 according to the invention.

[0227] Table 7 summarizes some information regarding the layer thicknesses of examples 1 to 7. The following abbreviations apply:

[0228] - d Agi), d(Ag2'), d(Ag3') : the geometric layer thickness of the first silver layer Ag1 , the second silver layer Ag2 and the third silver layer Ag3 respectively,

[0229] - d opt (Mi), d opt (M2),d opt (M3),d opt(M4): the optical layer thicknesses of the dielectric layer modulus M1, M2, M3 and M4 respectively, each calculated as the sum of the optical thicknesses of the individual layers of the respective layer modulus, which in turn are calculated as the product of the geometric thickness and the refractive index no,

[0230] - d opt (22c / b. 1), d opt (22b.2),d opt (22c. 3), d opt 22c + b. A), : the geometric layer thickness of the optically high-refractive-index anti-reflective layer 22c.1 (Examples 1-5) or 22b.1 (Examples 6-7) of the first layer module M1, the optically high-refractive-index layer 22b.2 of the second layer module M2, the optically high-refractive-index layer 22c.3 of the third layer module M3 and the entirety of the optically high-refractive-index layers 22b.4, 22b.4', 22c.4 of the fourth layer module M4,

[0231] - d opt (22.1),d opt (22.2),d opt (22.3), d opt(22.A)-. the optical layer thicknesses of the antireflection modulus 22.1 , 22.2, 22.3, 22.4 of the dielectric layer modulus M1 , M2, M3 and M4 respectively, each calculated as the sum of the optical thicknesses of the individual layers of the respective antireflection modulus, which in turn are calculated as the product of the geometric thickness and the refractive index no.

[0232] - y(O / N): the ratio of the sum of the geometric thicknesses of the oxide layers to the sum of the geometric thicknesses of the nitride layers of the IR-reflecting coating 20. Saint-Gobain Sekurit France 2024326-WO-PCT

[0233] Table 7 Saint-Gobain Sekurit France 2024326-WO-PCT

[0234] Table 8 summarizes some observations on the composite panes of examples 1 to 7. The following abbreviations are used: a*(8°), b*(8°): external reflection colors a* and b* in the Lab color space at an angle of incidence and observation angle of 8°, measured with a standard D65 light source and a 10° detector; a*(60°), b*(60°): external reflection colors a* and b* in the Lab color space at an angle of incidence and observation angle of 60°, measured with a standard D65 light source and a 10° detector.

[0235] - TL: Light transmission (total transmission according to ECE-R 43, Annex 3, § 9.1),

[0236] - RL: the integrated external reflectance from 380 nm to 780 nm at a

[0237] Incident angle and observation angle of 8°, measured with the standard light source A and a 2° detector,

[0238] - RE: Energy reflection determined according to ISO 9050 (air mass 1.5),

[0239] - TTS: TTS value determined according to ISO 13837 (Convention A, wind speed 4m / s).

[0240] Table 8

[0241] The values ​​were determined on a laminated glass pane with a clear outer pane 1 made of soda-lime glass with a thickness of 2.1 mm and a light transmission of 91%, an intermediate layer 3 made of a tinted PVB film with a thickness of 0.76 mm and a light transmission of 4%, and a tinted inner pane 2 made of soda-lime glass with a thickness of 1.6 mm and a light transmission of 82%, where the IR-reflecting Saint-Gobain Sekurit France 2024326- WO-PCT

[0242] The coating 20 was arranged on the interior surface II of the outer pane 1. The laminated pane did not have an emissivity-reducing coating 30.

[0243] Table 8 shows that all examples exhibit a neutral to slightly bluish exterior reflection color, both at an angle of 8° and at an angle of 60°. This ensures an aesthetically pleasing and uniform appearance of the laminated glass. Furthermore, the laminated glass has a relatively low reflectance and provides good shielding against the IR components of solar radiation.

[0244] Saint-Gobain Sekurit France 2024326-WO-PCT

[0245] Reference symbol list:

[0246] (1) Outer pane

[0247] (2) Inner disc

[0248] (3) thermoplastic intermediate layer

[0249] (4) Cover printing

[0250] (20) IR-reflective coating

[0251] (M1), (M2), (M3) 1st, 2nd, 3rd dielectric layer module

[0252] (M4) further dielectric layer module

[0253] (Ag1), (Ag2) 1st, 2nd silver layer

[0254] (Ag3) further silver layer

[0255] (22.1), (22.2), (22.3), (22.4) anti-reflection module of M1, M2, M3, M4

[0256] (22a.1), (22a.2), (22a.3), (22a.4) dielectric antireflection layer (no s 2,1) of (22.1),

[0257] (22.2), (22.3), (22.4)

[0258] (22b.1), (22b.2), (22b.4) optically high refractive index antireflection layer (no > 2,1) of (22.1), (22.2), (22.4)

[0259] (22b.4') further optically high-refractive-index anti-reflective coating (no

[0260] > 2.1) of (22.4)

[0261] (22c.1), (22c.3), (22c.4) optically high refractive index antireflection layer (no s 2,3) of (22.1), (22.3), (22.4)

[0262] (23.1), (23.2), (23.4) Smoothing layer of M1 , M2, M4

[0263] (24.1), (24.2), (24.4) upper adaptation layer of M1, M2, M4

[0264] (25.2), (25.3), (25.4) lower matching layer of M2, M3, M4

[0265] (26.1), (26.2), 1st, 2nd blocker layer

[0266] (26.3) further blocker layer

[0267] (30) emissivity-reducing coating

[0268] (I) outer surface of the outer pane 1

[0269] (II) interior surface of the outer pane 1

[0270] (III) outer surface of the inner pane 2

[0271] (IV) interior surface of the inner pane 2

Claims

Saint-Gobain Sekurit France 2024326-WO-PCT Patent claims 1. Composite disc with an IR-reflective coating (20), comprising - an outer pane (1) and an inner pane (2) connected to each other via a thermoplastic intermediate layer (3), - an IR-reflective coating (20) on the surface (II, III) of the outer pane (1) or the inner pane (2) facing the intermediate layer (3), wherein the IR-reflective coating (20) comprises, starting from said surface (II, III), in the order specified: - a first dielectric layer module (M1), - a first layer of silver (Ag1), - a second dielectric layer modulus (M2), - a second silver layer (Ag2), - a third dielectric layer module (M3), wherein - the first silver layer (Ag1) and the second silver layer (Ag2) each have a thickness of 6 nm to 16 nm, - the optical thickness of the first dielectric layer modulus (M1) ranges from 30 nm to 110 nm, - the optical thickness of the second dielectric layer modulus (M2) ranges from 150 nm to 210 nm, - the optical thickness of the third dielectric layer modulus (M3) is from 50 nm to 100 nm, - the ratio of the optical thickness of the first dielectric layer modulus (M1) to the optical thickness of the second dielectric layer modulus (M2) is between 0.15 and 0.55, - the ratio of the optical thickness of the first dielectric layer modulus (M1) to the optical thickness of the third dielectric layer modulus (M3) is from 0.55 to 1.55, - the ratio of the optical thickness of the second dielectric layer module (M2) to the optical thickness of the third dielectric layer module (M3) is from 2.15 to 2.85, and wherein each dielectric layer module (M1 , M2, M3) contains an optically high refractive antireflection layer (22b.1 , 22c.1 , 22b.2, 22c.3) with a refractive index of more than 2.

1. Saint-Gobain Sekurit France 2024326-WO-PCT 2. Composite disc according to claim 1, which has an outer reflection color at both an observation angle of 8° and an observation angle of 60°, characterized in the Lab color space by an a* value in the range of -2.0 to 0.5, preferably from -1.25 to 0.25, and a b* value in the range of -5.0 to 0.0, preferably from -2.5 to -1.25, measured with the light source D65 and a 10° detector.

3. Composite disc according to claim 1 or 2, wherein the optically high refractive index antireflective coatings (22b.1 , 22c.1 , 22b.2, 22c.3) are based on silicon-metal mixed nitride, titanium oxide, silicon carbide, manganese oxide, tungsten oxide, niobium oxide, zirconium nitride or aluminum nitride, preferably based on silicon-metal mixed nitride, in particular silicon-zirconium nitride.

4. Composite disc according to one of claims 1 to 3, wherein the first dielectric layer module (M1) and the third dielectric layer module (M3) each contain an optically high refractive index antireflective layer (22c.1 , 22c.3) with a refractive index of at least 2.3, preferably based on silicon-metal mixed nitride, titanium oxide or silicon carbide, in particular silicon zirconium nitride.

5. Composite disc according to any one of claims 1 to 4, wherein the first silver layer (Ag1) and the second silver layer (Ag2) each have a thickness of 7 nm to 14 nm, preferably 8 nm to 13 nm, and wherein the ratio of the thickness of the first silver layer (Ag1) to the thickness of the second silver layer (Ag2) is preferably 0.45 to 2.2, particularly preferably 0.9 to 2.0, most preferably 1.0 to 1.8, and particularly preferably 1.2 to 1.

6.

6. Composite disc according to one of claims 1 to 5, wherein - the optical thickness of the first dielectric layer modulus (M1) is from 30 nm to 100 nm, preferably from 50 nm to 90 nm, particularly preferably from 65 nm to 85 nm, - the optical thickness of the second dielectric layer modulus (M2) is from 150 nm to 200 nm, preferably from 155 nm to 190 nm, particularly preferably from 160 nm to 180 nm, and - the optical thickness of the third dielectric layer modulus (M3) is from 60 nm to 90 nm, preferably from 65 nm to 85 nm, particularly from 65 nm to 75 nm. Saint-Gobain Sekurit France 2024326-WO-PCT 7. Composite disc according to one of claims 1 to 6, wherein - the ratio of the optical thickness of the first dielectric layer modulus (M1) to the optical thickness of the second dielectric layer modulus (M2) is from 0.2 to 0.5, preferably from 0.4 to 0.5, - the ratio of the optical thickness of the first dielectric layer modulus (M1) to the optical thickness of the third dielectric layer modulus (M3) is from 0.6 to 1.5, preferably from 0.9 to 1.3, in particular from 0.9 to 1.1 , - the ratio of the optical thickness of the second dielectric layer modulus (M2) to the optical thickness of the third dielectric layer modulus (M3) is from 2.2 to 2.7, preferably from 2.2 to 2.6, in particular from 2.2 to 2.

4.

8. Composite disc according to one of claims 1 to 7, wherein the proportion of the optically high refractive index anti-reflective layer (22b.1 , 22c.1 , 22b.2, 22c.3) to the optical thickness - of the first layer modulus (M1) preferably from 0.1 to 0.4, preferably from 0.2 to 0.3, - of the second layer modulus (M2) is from 0.1 to 0.6, preferably from 0.1 to 0.2, - of the third layer modulus (M3) is from 0.1 to 0.5, preferably from 0.3 to 0.

4.

9. Composite disc according to one of claims 1 to 8, wherein the layer modules (M1 , M2, M3) are formed from oxide and nitride dielectric layers and wherein the ratio of the sum of the geometric thicknesses of the oxide dielectric layers to the sum of the geometric thicknesses of the nitride dielectric layers of the IR-reflecting coating (20) is at least 0.6, for example from 0.6 to 1.0, preferably at least 0.7, particularly preferably at least 0.8, in particular at least 0.

9.

10. Composite disc according to any one of claims 1 to 9, wherein - the first dielectric layer module (M1) o an antireflection module (22.1), comprising a dielectric layer (22a.1) with a refractive index of at most 2.1, preferably based on silicon nitride, and an optically high refractive index antireflection layer (22b.1 , 22c.1) with a refractive index of more than 2.1, preferably at least 2.3, Saint-Gobain Sekurit France 2024326- WO-PCT o a smoothing layer (23.1) with a refractive index of 1.9 to 2.1, preferably based on tin-zinc mixed oxide, o an upper matching layer (24.1) with a refractive index of 1.9 to 2,1 , preferably based on zinc oxide, - the second dielectric layer modulus (M2) o a lower matching layer (25.2) with a refractive index of 1.9 to 2,1 , preferably based on zinc oxide, o an antireflection module (22.2) comprising a dielectric layer (22a.2) with a refractive index of at most 2.1 , preferably based on silicon nitride, and an optically high refractive index antireflection layer (22b.2) with a refractive index of more than 2.1 , o a smoothing layer (23.2) with a refractive index of 1.9 to 2.1 , preferably based on tin-zinc mixed oxide , o an upper matching layer (24.2) with a refractive index of 1.9 to 2,1 , preferably based on zinc oxide, - the third dielectric layer modulus (M3) o a lower matching layer (25.3) with a refractive index of 1.9 to 2,1 , preferably based on zinc oxide, o an antireflection module (22.3), comprising an optically high refractive index antireflection layer (22c.3) with a refractive index of more than 2.1 , preferably at least 2.3 , and a dielectric layer (22a.2) with a refractive index of at most 2.1 , preferably based on silicon nitride , each in the specified order in one direction starting from said surface (II, III).

11. Composite disc according to claim 10, wherein - the optical thickness of the antireflection modulus (22.1) of the first dielectric layer modulus (M1) is from 20 nm to 70 nm, preferably from 25 nm to 45 nm, - the optical thickness of the antireflection modulus (22.2) of the second dielectric layer modulus (M2) is from 80 nm to 170 nm, preferably from 85 nm to 125 nm, - the optical thickness of the antireflection modulus (22.3) of the third dielectric layer modulus (M3) is from 30 nm to 70 nm, preferably from 35 nm to 55 nm, particularly preferably from 40 nm to 50 nm, and wherein the proportion of the optically high refractive index antireflection layer (22b.1 , 22c.1 ; 22b.2; 22c.3) Saint-Gobain Sekurit France 2024326-WO-PCT - the optical thickness of the antireflection modulus (22.1) of the first dielectric layer modulus (M1) is from 0.3 to 0.8, preferably from 0.4 to 0.7, particularly preferably from 0.4 to 0.6, - the optical thickness of the antireflection modulus (22.2) of the second dielectric layer modulus (M2) is from 0.1 to 1.0, preferably from 0.1 to 0.5, particularly preferably from 0.2 to 0.4, - the optical thickness of the antireflection modulus (22.3) of the third dielectric layer modulus (M3) is from 0.1 to 0.8, preferably from 0.3 to 0.7, particularly preferably from 0.3 to 0.

6.

12. Composite disc according to one of claims 1 to 11, wherein the IR-reflecting coating (20) comprises exactly two silver layers (Ag1 , Ag2) and three dielectric layer modules (M1 , M2, M3).

13. Composite disc according to one of claims 1 to 11, wherein the IR-reflecting coating (20) between the first dielectric layer module (M1) and the first silver layer (Ag1) further comprises, in the specified order starting from the first dielectric layer module (M1): - another silver layer (Ag3), - another dielectric layer module (M4), and wherein - the thickness of the further silver layer (Ag3) is from 6 nm to 16 nm, preferably from 7 nm to 12 nm, preferably from 8 nm to 10 nm, - the optical thickness of the further dielectric layer modulus (M4) is from 100 nm to 150 nm, preferably from 120 nm to 140 nm, - the proportion of the optically high refractive index antireflection layer (22b.4, 22c.4, 22b.4') to the optical thickness of the further layer modulus (M4) is from 0.4 to 0.8, preferably from 0.5 to 0.

7.

14. Composite disc according to one of claims 1 to 13, wherein an emissivity-reducing coating (30) is arranged on the surface (IV) of the inner disc (2) facing away from the intermediate layer (3), which comprises a layer based on a transparent conductive oxide (TCO).

15. Composite disc according to one of claims 1 to 14, which is a vehicle- It's a roof disc.

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