Opaque vehicle composite pane with sunscreen coating and heat ray reflective coating

Abstract

The invention relates to a composite glass pane (100) for a vehicle, comprising at least an outer glass pane (1) having an outer surface (I) and an inner surface (II); an inner pane (2) having an outer surface (III) and an inner surface (IV); the thermoplastic intermediate layer (3) is arranged between the outer pane (1) and the inner pane (2), a sunscreen coating (4) is arranged on an inner surface (II) of the outer pane (1), a heat-ray-reflecting coating (5) is arranged on an inner surface (IV) of the inner pane (2), the thermoplastic intermediate layer (3) and / or the inner pane (2) is colored, and the heat-ray-reflecting coating (5) is arranged on an inner surface (IV) of the inner pane (2). The thermoplastic intermediate layer (3) and the inner pane (2), together with a heat-ray-reflecting coating (5) arranged on the inner surface (IV), have a light transmission TL3 + 2 + 5 of less than 0.5%, the outer pane (1) has a light transmission TL1 of greater than 90%, and the vehicle composite pane (100) has a total transmitted thermal radiation TTS100 of at most 13%.

Description

[0001] This invention relates to an opaque laminated carrier glass panel having a sun-protective coating and a heat radiation-reflective coating, a method of its production, and its use.

[0002] It is known that transparent laminated vehicle glass panels are equipped with sun-protective coatings and heat radiation-reflective coatings to prevent overheating of the vehicle's interior and reduce heat absorption by the laminated vehicle glass panels.

[0003] DE 19927683 C1 discloses a laminated glass pane having at least two glass panes and a transparent laminate connecting them, and having a sun protection layer that substantially reflects radiation outside the visible spectrum of solar radiation, particularly infrared radiation. The laminated glass pane has an additional transparent coating on its interior space-facing surface, which is spatially separated from the sun protection layer and substantially reflects thermal radiation (a low-E layer). The purpose of DE 19927683 C1 is to provide a laminated glass pane with sun-protective properties, which significantly reduces heat absorption from the interior space of a vehicle through large-area glazing at low outdoor temperatures. The light transmittance through this laminated glass pane is, for example, 31%.

[0004] WO 2019 / 110172 A1 discloses a laminated glass sheet comprising an outer glass sheet having an outer surface and an inner surface, an inner glass sheet having an outer surface and an inner surface, and a thermoplastic interlayer connecting the inner surface of the outer glass sheet to the outer surface of the inner glass sheet. The laminated glass sheet has at least one sun-protective coating between the outer and inner glass sheets, which substantially reflects or absorbs radiation outside the visible spectrum of solar radiation, particularly infrared radiation. The laminated glass sheet also has a heat-reflective coating on the inner surface of the inner glass sheet. The laminated glass sheet has a transmittance index A of 0.02 to 0.08, wherein the transmittance index A is determined according to the following formula: A = TL 层压玻璃板 / (TL 低辐射涂覆玻璃板 TE), where TL is the light transmittance and TE is the energy transmittance as measured according to ISO 9050.

[0005] Compared to vehicles with metal roofs, vehicles with sunroofs require different body shapes, and therefore different production lines and tools.

[0006] Restricting manufacturing to vehicles with sunroofs to avoid different production lines and tools would be detrimental to end consumers who want opaque roofs.

[0007] The purpose of this invention is to provide an opaque laminated carrier glass plate with good thermal properties.

[0008] According to the present invention, this objective is achieved by a laminated carrier glass panel according to claim 1. The laminated carrier glass panel according to the present invention comprises an outer glass panel having an outer surface and an inner surface, an inner glass panel having an outer surface and an inner surface, and a thermoplastic interlayer, wherein the thermoplastic interlayer is disposed between the outer glass panel and the inner glass panel. The laminated carrier glass panel has a sun-protective coating on the inner surface of the outer glass panel, which substantially reflects or absorbs radiation outside the visible spectrum of solar radiation, particularly infrared radiation. Furthermore, the laminated carrier glass panel has a heat-reflective coating on the inner surface of the inner glass panel. The thermoplastic interlayer and / or the inner glass panel are colored.

[0009] According to the present invention, the outer glass plate has a light transmittance of more than 90%, the thermoplastic intermediate layer and the inner glass plate together with the heat radiation reflective coating disposed on the inner surface of the inner glass plate have a light transmittance of less than 0.5%, and the laminated carrier glass plate has a total transmitted heat radiation of up to 13%.

[0010] It should be understood that the laminated carrier glass has a light transmittance of less than 0.5% because the thermoplastic interlayer and the inner glass, together with the heat radiation reflective coating disposed on the inner surface of the inner glass, have a light transmittance of less than 0.5%.

[0011] The light transmittance of the outer glass plate was subsequently designated as TL1. The light transmittance exhibited by the combination of the thermoplastic interlayer and the inner glass plate with the heat radiation reflective coating applied to the inner surface of the inner glass plate was subsequently designated as TL1. 3+2+5 The light transmittance of the laminated carrier glass plate was subsequently designated as TL. 100 The total transmitted thermal radiation of the laminated carrier glass plate was subsequently designated as TTS. 100 The light transmittance of the thermoplastic interlayer was subsequently designated as TL3. The light transmittance of the inner glass plate with a heat radiation reflective coating applied to the inner surface of the inner glass plate was subsequently designated as TL3. 2+5 The light transmittance of the outer glass panel with a sun-protective coating applied to the inner surface of the outer glass panel was subsequently designated as TL. 1+4 .

[0012] The value of light transmittance (TL) (as is commonly used in automotive glass) relates to the light source A, which is the visible portion of sunlight at wavelengths between 380 nm and 780 nm.

[0013] In the context of this invention, the term "opaque laminated carrier glass" refers to a laminated carrier glass having a light transmittance of less than 0.5%.

[0014] The total transmitted solar thermal radiation through a laminated carrier glass plate represents a measure of a particular sun protection property, and is measured, for example, according to ISO 13837.

[0015] The laminated carrier glass plate according to the invention is characterized by its excellent thermal properties. As described above, the total transmitted thermal emissivity of the laminated carrier glass plate according to the invention is at most 13%.

[0016] The laminated carrier glass panel is configured to separate the interior space of the carrier from the external environment at a window opening. The laminated carrier glass panel is a laminate and includes a first glass panel and a second glass panel, referred to in the context of this invention as an outer glass panel and an inner glass panel, connected to each other via a thermoplastic interlayer. In the context of this invention, the term "inner glass panel" is understood to refer to the glass panel facing the interior space when in the installation position. The outer glass panel refers to the glass panel facing the external environment when in the installation position. In the context of this invention, the inner surface (or inner or side surface) is understood to be the glass panel surface facing the interior space when in the installation position. In the context of this invention, the outer surface (or outer or side surface) is understood to be the glass panel surface facing the external environment when in the installation position.

[0017] The surfaces of glass plates are typically named as follows: The outer side of the outer glass panel is called surface I. The inner side of the outer glass panel is called surface II. The outer side of the inner glass panel is called surface III. The inner side of the inner glass panel is called surface IV.

[0018] The inner surface of the outer glass panel and the outer surface of the inner glass panel face each other and are bonded together by means of a thermoplastic interlayer.

[0019] As described above, in the laminated carrier glass sheet according to the present invention, the thermoplastic interlayer and / or the inner glass sheet are colored. Therefore, in the laminated carrier glass sheet according to the present invention, either the thermoplastic interlayer is colored and the inner glass sheet is clear, or the thermoplastic interlayer is clear and the inner glass sheet is colored, or both the thermoplastic interlayer and the inner glass sheet are colored.

[0020] In a preferred embodiment of the laminated carrier glass plate according to the invention, the thermoplastic interlayer is colored and has a light transmittance of less than 0.5%, preferably less than 0.3%, particularly preferably less than 0.1%, and very particularly preferably 0.0%. In these embodiments, the inner glass plate may be colorless or also colored.

[0021] In a further preferred embodiment of the laminated carrier glass plate according to the invention, the inner glass plate is colored, and the inner glass plate with a heat radiation reflective coating disposed on its inner surface has a light transmittance of less than 0.5%, preferably less than 0.3%, and particularly preferably less than 0.1%. In these embodiments, the thermoplastic interlayer may be colorless or also colored.

[0022] If the thermoplastic interlayer is colored, it contains dye. The dye can be, for example, ink or colored pigment. In particular, the thermoplastic interlayer contains colored pigment.

[0023] If the inner glass is colored, it contains ink or dye. The dye can be, for example, ink or colored pigment. In particular, the inner glass contains colored pigment.

[0024] Suitable inks or color pigments are known to those skilled in the art, and therefore will not be discussed in more detail below. Carbon black is particularly preferred as a dye.

[0025] In a preferred embodiment, the laminated carrier glass plate according to the invention has a light transmittance of less than 0.3%, particularly preferably less than 0.1%.

[0026] In a particularly preferred embodiment, the laminated carrier glass plate according to the invention has a light transmittance of 0.0%; therefore, in such an embodiment, no light can pass through the laminated carrier glass plate.

[0027] In a preferred embodiment, the laminated carrier glass plate has a total transmitted thermal radiation of less than 12%.

[0028] As described above, according to the present invention, the thermoplastic interlayer and / or inner glass panel are colored. The preferred color is black, but other colors are also possible. For example, the color can be adapted to the vehicle body surrounding the laminated vehicle glass panel when it is installed in a vehicle.

[0029] The sun-protective coating essentially covers the entire surface of the laminated carrier glass panel, that is, the entire surface or the entire surface except for the peripheral edge area. The peripheral edge area has a width of, for example, up to 20 cm. It prevents the sun-protective coating from direct contact with the surrounding atmosphere, thereby protecting the sun-protective coating inside the laminated carrier glass panel from corrosion and damage.

[0030] The function of a sun-protective coating is to filter out a portion of solar radiation, particularly in the infrared range. Therefore, sun-protective coatings are preferably infrared-reflective coatings, especially those containing a metallic layer. The sun-protective coating preferably comprises at least one thin, transparent metallic layer embedded between at least two dielectric layers. Silver has become the preferred metal for this layer. The function of the dielectric layer is to improve the optical properties of the coated glass through its refractive index and to protect the metallic functional layers from oxidation. Such sun-protective coatings, which can be manufactured, for example, by reactive sputtering, are widely used in prefabricated glass for buildings, but have also been used in motor vehicles. In most cases, a layer system with two silver functional layers is used, but three or four silver functional layers are also used, each embedded between two dielectric layers.

[0031] The dielectric layer is preferably formed based on dielectric oxides or nitrides, such as ZnO, SnZnO, AlN, SiO2, TiO2 or Si3N4.

[0032] In a particularly preferred embodiment, the sun-protective coating has at least the following layers or layer sequence, arranged in a specified order from the outer glass plate to the inner glass plate: - The first dielectric layer or layer sequence is designated as module M1. - First silver layer Ag1, - The second dielectric layer or layer sequence serves as module M2. - Second silver layer Ag2, - The third dielectric layer or layer sequence is used as module M3. - The third silver layer, Ag3, and - The fourth dielectric layer or layer sequence is used as module M4.

[0033] In this embodiment, the coating may comprise an additional silver layer and dielectric module disposed above the fourth dielectric module M4. Besides the silver layer, other metal-containing layers may also be present, which do not significantly contribute to the sun-protective properties of the coating but serve another purpose. This is particularly suitable for metal barrier layers with a geometrical thickness of less than 1 nm, preferably disposed between the silver layer and the dielectric module.

[0034] The silver layer imparts a basic infrared reflective effect to the sunscreen coating. The term "silver layer" here refers to the layer formed from silver. The silver layer is formed, for example, from silver. The silver layer preferably contains at least 90% by weight of silver, particularly preferably at least 99% by weight of silver, and very particularly preferably at least 99.9% by weight of silver. The silver layer may contain dopants such as palladium, gold, copper, or aluminum.

[0035] In one embodiment, all dielectric layers have a refractive index greater than 1.8, preferably greater than 1.9. In other words, all dielectric layers or layer sequences of the dielectric module are exclusively formed of dielectric layers having a refractive index greater than 1.8. The dielectric layers may be formed, for example, based on silicon nitride, silicon-metal mixed nitrides (such as silicon-zirconium nitride (SiZrN), silicon-aluminum mixed nitride, silicon-hafnium mixed nitride, or silicon-titanium mixed nitride), aluminum nitride (AlN), tin oxide (SnO), manganese oxide (MnO), tungsten oxide (WO3), niobium oxide (Nb2O5), bismuth oxide (Bi2O3), titanium dioxide (TiO2), zinc oxide (ZnO), or tin-zinc mixed oxide (SnZnO).

[0036] In the context of this invention, the refractive index is specified in all cases relative to a wavelength of 550 nm. The materials mentioned in this specification can be deposited stoichiometrically, substoichiometrically, or superstoichiometrically. The material may contain dopants, particularly aluminum, boron, zirconium, or titanium. Due to the dopants, the dielectric material can be provided with a certain degree of conductivity. Nevertheless, as is customary in the field of thin layers, those skilled in the art will recognize it as a dielectric layer for its function. The material of the dielectric layer preferably has a refractive index of less than 10. -4 The conductivity (reciprocal of specific resistance) is S / m. The material of the silver layer preferably has a conductivity greater than 10. 4 Conductivity in S / m.

[0037] The first, second, third, and / or fourth dielectric modules preferably contain a dielectric layer that acts as an antireflection layer. In an advantageous embodiment, each dielectric module contains a dielectric layer as an antireflection layer. The antireflection layer reduces the reflection of visible light and thus increases the transparency of the coated glass plate. The antireflection layer is formed, for example, based on silicon nitride (Si3N4), silicon oxide (SiO2), silicon oxynitride, silicon-metal mixed nitrides such as silicon-zirconium nitride (SiZrN), aluminum nitride (AlN), or tin oxide (SnO). Furthermore, the antireflection layer may contain dopants. The antireflection layer preferably has a geometric thickness of 5 nm to 100 nm, particularly preferably 10 nm to 60 nm.

[0038] In an advantageous embodiment, one or more dielectric layer modules have a first adapter layer, preferably disposed below at least each dielectric module under the silver layer. The first adapter layer is preferably disposed above the antireflective layer. The first adapter layer is preferably disposed directly below the first silver layer so that it is in direct contact with the corresponding silver layer. This is particularly advantageous for the crystallinity of the silver layer. In an advantageous embodiment, one or more dielectric modules have a second adapter layer, preferably disposed above each dielectric layer sequence above the silver layer. The second adapter layer is preferably disposed below the antireflective layer.

[0039] The first adapter layer and / or the second adapter layer preferably contain zinc oxide (ZnO). The first adapter layer and / or the second adapter layer also preferably contain a dopant. The first adapter layer and / or the second adapter layer may contain, for example, aluminum-doped zinc oxide (ZnO:Al). The zinc oxide is preferably deposited with respect to oxygen substoichiometry to avoid excessive oxygen reacting with the silver-containing layer. The geometric layer thickness of the first and second adapter layers is preferably 5 nm to 20 nm, particularly preferably 8 nm to 20 nm.

[0040] In an advantageous embodiment, one or more dielectric modules have at least one dielectric layer as a smoothing layer, preferably disposed between two silver layers in each dielectric module, and particularly preferably with an additional lowermost first dielectric module. If such a first adapter layer is present, at least one smoothing layer is disposed below the first adapter layer, preferably disposed between the antireflective layer and the first adapter layer. The smoothing layer is particularly preferably in direct contact with the first adapter layer. The smoothing layer optimizes, in particular smooths, the surface of the silver layer subsequently applied above. The silver layer deposited on the smooth surface has high transmittance while having low sheet resistance. The geometric thickness of the smoothing layer is preferably 5 nm to 20 nm, particularly preferably 5 nm to 12 nm. The smoothing layer preferably has a refractive index of less than 2.2.

[0041] The smoothing layer preferably contains at least one amorphous oxide. The oxide can be amorphous or partially amorphous (and therefore partially crystalline), but not fully crystalline. The amorphous smoothing layer has low roughness and thus creates a favorable smooth surface for the layer to be applied over it. The amorphous smoothing layer also achieves an improved surface structure for the layer deposited directly over it (preferably the first adapter layer). The smoothing layer can contain at least one oxide of one or more of the elements tin, silicon, titanium, zirconium, hafnium, zinc, gallium, and indium. The smoothing layer particularly preferably contains an amorphous mixed oxide. The smoothing layer particularly preferably contains a tin / zinc mixed oxide (ZnSnO). This mixed oxide may have a dopant. The smoothing layer may contain, for example, an antimony-doped tin / zinc mixed oxide. This mixed oxide preferably has a substoichiometric oxygen content.

[0042] In an advantageous embodiment, the sunscreen coating comprises one or more barrier layers. Preferably, at least one silver layer, and particularly preferably each silver layer is associated with at least one barrier layer. The barrier layer is in direct contact with the silver layer and is disposed directly above or immediately below the silver layer. Thus, no additional layer is disposed between the silver layer and the associated barrier layer. The barrier layer may also be disposed directly above or immediately below the silver layer. The barrier layer preferably contains niobium, titanium, nickel, chromium, and / or alloys thereof, particularly preferably a nickel-chromium alloy. The geometric thickness of the barrier layer is preferably from 0.1 nm to 1.5 nm, particularly preferably from 0.1 nm to 1.0 nm. The barrier layer immediately below the silver layer is particularly useful for stabilizing the silver layer during temperature treatment and improving the optical quality of the sunscreen coating. The barrier layer immediately above the silver layer prevents the sensitive silver layer from contacting the oxidizing reactive atmosphere during the deposition of the next layer, such as a second adapter layer, by reactive cathode sputtering.

[0043] If a layer is formed based on a certain material, the layer is composed primarily of that material, except for any impurities or dopants. If the first layer is disposed above the second layer, this in the sense of the invention means that the first layer is disposed further away from the substrate on which the coating is applied than the second layer. If the first layer is disposed below the second layer, this in the sense of the invention means that the second layer is disposed further away from the substrate than the first layer. If the first layer is disposed above or below the second layer, this in the sense of the invention does not necessarily mean that the first and second layers are in direct contact with each other. One or more additional layers may be disposed between the first and second layers, provided that this is not explicitly excluded.

[0044] Suitable sun protection coatings are known, for example, from WO2013 / 104439A1, DE 19927683C1, WO2019 / 110172A1 or WO2022 / 112231A1.

[0045] As an alternative to inorganic, particularly silver-based, coatings, sunscreen coatings can also be based on non-metallic, organic materials. In such cases, the sunscreen coating is preferably a stack of several, typically hundreds, organic layers with different or alternating refractive indices. This stack is a birefringent dielectric interference stack that reflects infrared radiation due to interference effects. Compared to metallic coatings, such organic coatings have the advantages of higher color neutrality and higher light transmittance. Furthermore, they do not interfere with the transmission of electromagnetic signals. For example, 3M offers such sunscreen coatings on PET carrier films under the trademark "Ultra-Clear Solar Film".

[0046] According to the present invention, a heat-reflecting coating is applied to the inner surface of the inner glass panel. Such coatings are known, for example, from WO2013 / 131667A1. The heat-reflecting coating may also be referred to as a low-emissivity coating, a low-emissivity coating, a low-E coating, or a low-emissivity layer. Its function is to reflect heat radiation, specifically infrared radiation with wavelengths longer than the infrared component of solar radiation. At low outdoor temperatures, the low-emissivity coating reflects heat back into the interior space and reduces cooling. At high outdoor temperatures, the low-emissivity coating reflects the heat radiation from the heated laminated carrier glass panel outwards and reduces heating in the interior space. On the inner side of the inner glass panel, the coating according to the present invention is particularly effective in reducing heat radiation emitted by the glass panel into the interior space in summer and in reducing heat loss to the external environment in winter.

[0047] The heat-reflective coating substantially covers the entire surface of the laminated carrier glass plate, i.e., the entire surface or the entire surface except for the peripheral edge region. The peripheral edge region has a width of, for example, up to 20 cm. Particularly preferably, the heat-reflective coating covers the entire surface of the laminated carrier glass plate.

[0048] The heat-reflective coating preferably comprises a functional layer containing a transparent conductive oxide (TCO), preferably indium tin oxide (ITO), tin oxide doped with antimony or fluorine, or zinc oxide doped with gallium or aluminum (ZnO:Ga or ZnO:Al), with indium tin oxide being preferred. However, the functional layer may also contain other conductive oxides, such as fluorine-doped tin oxide (SnO2:F), antimony-doped tin oxide (SnO2:Sb), mixed indium-zinc oxide (IZO), gallium-doped or aluminum-doped zinc oxide, niobium-doped titanium oxide, cadmium stannate, or zinc stannate. This achieves particularly good results in terms of the emissivity and flexibility of the coating according to the invention. The refractive index of the functional layer material is preferably from 1.7 to 2.5.

[0049] Indium tin oxide (ITO) is preferably deposited by magnetic field-assisted cathode sputtering using an ITO target. The target preferably contains 75% to 95% by weight of indium oxide and 5% to 25% by weight of tin oxide, as well as manufacturing-related dopants. Tin-doped ITO is preferably deposited under a protective gas atmosphere, such as argon. A small proportion of oxygen may also be added to the protective gas, for example, to improve the uniformity of the functional layer.

[0050] Alternatively, the target may preferably contain at least 75% to 95% by weight of indium and 5% to 25% by weight of tin. Indium tin oxide is then preferably deposited during cathode sputtering with oxygen added as a reactive gas.

[0051] In addition, thermal radiation reflective coatings typically contain a dielectric layer, particularly formed of dielectric oxides or nitrides, such as ZnO, SnZnO, AlN, TiO2, SiO2, or Si3N4.

[0052] The thickness of the functional layer is preferably from 40 nm to 200 nm, particularly preferably from 60 nm to 150 nm, and very particularly preferably from 65 nm to 85 nm, for example, about 75 nm. Within this thickness range, the particularly advantageous ability of the thermal radiation reflective coating to withstand mechanical deformation such as bending or prestressing without damage is achieved.

[0053] In a particularly preferred embodiment, the thermal radiation reflective coating, starting from the inner surface, consists of a Si3N4 layer with a thickness of 25 nm to 35 nm, a SiO2 layer with a thickness of 10 nm to 20 nm, an indium tin oxide layer with a thickness of 65 nm to 75 nm, a Si3N4 layer with a thickness of 8 nm to 12 nm, and a SiO2 layer with a thickness of 45 nm to 55 nm.

[0054] The outer and inner glass panels are preferably made independently of each other from glass or plastic, preferably from soda-lime glass, alkali aluminosilicate glass, polycarbonate, or polymethacrylate. In a particularly preferred embodiment, the outer and inner glass panels are made of glass.

[0055] The outer glass plate and / or the inner glass plate preferably have a thickness of 0.1 to 4 mm, more preferably 1 to 4 mm, and particularly preferably 1.6 mm to about 2.1 mm, independent of each other.

[0056] The thermoplastic interlayer preferably contains polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), and / or mixtures thereof and / or copolymers thereof, with polyvinyl butyral being particularly preferred. It should be understood that the colored thermoplastic interlayer described above contains dyes.

[0057] The thermoplastic interlayer preferably has a thickness of about 0.2 mm to 1 mm, for example 0.38 mm or 0.76 mm.

[0058] The present invention also relates to a method for manufacturing a laminated carrier glass plate according to the invention, wherein the method comprises at least the following steps: a) A stacking sequence is provided, comprising an outer glass plate having an outer surface and an inner surface, an inner glass plate having an outer surface and an inner surface, and a thermoplastic interlayer, wherein the thermoplastic interlayer is disposed between the outer glass plate and the inner glass plate, a sun-protective coating is disposed on the inner surface of the outer glass plate, a heat-reflective coating is disposed on the inner surface of the inner glass plate, the thermoplastic interlayer and / or the inner glass plate are colored, the thermoplastic interlayer and the inner glass plate together with the heat-reflective coating disposed on the inner surface of the inner glass plate have a light transmittance of less than 0.5%, and the outer glass plate has a light transmittance of greater than 90%. b) Lamination stacking sequence.

[0059] Lamination is preferably performed under the influence of heat, vacuum, and / or pressure. Known lamination methods can be used, such as autoclave lamination, vacuum bag lamination, vacuum ring lamination, calendering, vacuum laminator lamination, or combinations thereof.

[0060] The present invention also relates to the use of the laminated vehicle glass panel according to the invention in land, air or water transport vehicles, preferably as a roof pane, and particularly preferably as a roof pane of a motor vehicle, especially a passenger car.

[0061] The invention will now be explained in more detail with the aid of the accompanying drawings and exemplary embodiments. The drawings are schematic and not to scale. The drawings do not limit the invention in any way.

[0062] In the attached diagram: Figure 1 The image shows a cross-section of a laminated carrier glass plate according to one embodiment of the invention.

[0063] Figure 1 The diagram shows a cross-section through one embodiment of a laminated carrier glass plate 100 according to the invention. The laminated carrier glass plate 100 includes an outer glass plate 1 and an inner glass plate 2, which are connected to each other via a thermoplastic interlayer 3. The laminated carrier glass plate 100 has, for example, approximately 1 m². 2The outer glass panel 1 is sized and designed as the roof glass panel of a passenger vehicle, wherein the outer glass panel 1 is intended to face the external environment, and the inner glass panel 2 is intended to face the interior space of the vehicle. The outer glass panel 1 has an outer surface I and an inner surface II. The inner glass panel 2 has an outer surface III and an inner surface IV. In the mounting position, outer surfaces I and III face the external environment, while inner surfaces II and IV face the interior space of the vehicle. The inner surface II of the outer glass panel 1 and the outer surface III of the inner glass panel 2 face each other. The outer glass panel 1 and the inner glass panel 2 contain, for example, soda-lime glass, and each has, for example, a thickness of 2.1 mm. A thermoplastic interlayer 3 contains, for example, polyvinyl butyral (PVB) or is composed of polyvinyl butyral (PVB), and has, for example, a thickness of 0.76 mm. The thermoplastic interlayer 3 is colored and has a light transmittance TL3 of 0.0%.

[0064] A sun-protective coating 4 is applied to the inner surface II of the outer glass panel 1. The sun-protective coating 4 extends over the entire inner surface II, minus an outer perimeter frame-shaped uncoated region with a width of 8 mm. The uncoated region is hermetically sealed by bonding it to a thermoplastic interlayer 3. This advantageously protects the sun-protective coating 4 from damage and corrosion.

[0065] A thermal radiation reflective coating 5 is disposed on the inner surface IV of the inner glass plate 2. The thermal radiation reflective coating 5, for example, starting from the inner surface, consists of a Si3N4 layer with a thickness of 25 nm to 35 nm, a SiO2 layer with a thickness of 10 nm to 20 nm, an indium tin oxide layer with a thickness of 65 nm to 75 nm, a Si3N4 layer with a thickness of 8 nm to 12 nm, and a SiO2 layer with a thickness of 45 nm to 55 nm.

[0066] The inner glass plate 2 is gray tinted glass, and the light transmittance TL of the inner glass plate 2 is achieved by applying a heat radiation reflective coating 5 to its inner surface IV. 2+5 For example, 27.8%. It should be understood that the inner glass panel 2 can alternatively be clear glass. The outer glass panel 1 is clear glass and has, for example, 91% light transmittance TL1.

[0067] By reflecting infrared radiation, the sun-protective coating 4 reduces heat generation in the vehicle's interior space and the inner glass panel 2. On one hand, the heat-reflective coating 5 reduces heat radiation emitted through the laminated vehicle glass panel into the vehicle's interior space, especially at high outdoor temperatures. On the other hand, the heat-reflective coating 5 also reduces heat radiation emitted from the vehicle's interior space at low outdoor temperatures.

[0068] The sun protection coating 4 is designed, for example, to include three functional silver layers. For example, the sun protection coating is designed as described in WO 2022 / 112231 A1.

[0069] refer to Figure 1 The invention will now be explained in more detail with reference to non-limiting exemplary embodiments and comparative examples.

[0070] Table 1 Use the following abbreviations: TL1: Light transmittance of outer glass plate 1 TL 1+4 Light transmittance of the outer glass panel 1 with sun protection coating 4 TL 2+5 The light transmittance of the inner glass plate 2 with the heat radiation reflective coating 5 TL3: Light transmittance of thermoplastic interlayer 3 TL 3+2+5 The light transmittance of the combination of thermoplastic interlayer 3 and inner glass plate 2 with heat radiation reflective coating 5 TL 100 Light transmittance of 100% of laminated carrier glass plate TTS 100 Total transmitted thermal radiation of the laminated carrier glass plate 100.

[0071] In embodiment A, the laminated carrier glass plate 100 is as follows: Figure 1 The design shown is shown in the image.

[0072] The laminated carrier glass plate 100 of the present invention according to Example B differs from the laminated carrier glass plate according to Example A only in that the thermoplastic intermediate layer 3 has a light transmittance TL3 of 0.40%.

[0073] The difference between the laminated carrier glass plate of the comparative example and the laminated glass plate 100 of the present invention according to Example A is that the thermoplastic interlayer 3 has a light transmittance TL3 of 30.8%. Therefore, in the comparative example, neither the inner glass plate 2 with the heat radiation reflective coating 5 nor the thermoplastic interlayer 3 has a light transmittance of less than 0.5%. In the comparative example, the thermoplastic interlayer and the inner glass plate, together with the heat radiation reflective coating disposed on the inner surface of the inner glass plate, have a light transmittance of 9%.

[0074] It has been shown that, compared with corresponding non-inventory laminated carrier glass panels (where the thermoplastic interlayer and inner glass panel together with the heat radiation reflective coating disposed on the inner surface of the inner glass panel have high light transmittance), the opaque laminated carrier glass panel according to the invention, wherein the thermoplastic interlayer and inner glass panel together with the heat radiation reflective coating have light transmittance of less than 0.5%, exhibits lower transmitted heat radiation and thus provides greater thermal comfort.

[0075] Reference tag list: 1. Outer glass panel 2. Inner glass plate 3. Thermoplastic interlayer 4. Sunscreen coating 5. Thermal radiation reflective coating 100-layer pressurized glass plate I. Outer surface of outer glass plate 1 II. Inner surface of outer glass plate 1 III. Outer surface of inner glass plate 2 IV. Inner surface of inner glass plate 2.

Claims

1. A laminated carrier glass panel (100) comprising at least an outer glass panel (1) having an outer surface (I) and an inner surface (II), an inner glass panel (2) having an outer surface (III) and an inner surface (IV), and a thermoplastic interlayer (3), The thermoplastic interlayer (3) is disposed between the outer glass plate (1) and the inner glass plate (2). The sun protection coating (4) is applied to the inner surface (II) of the outer glass plate (1). A heat radiation reflective coating (5) is applied to the inner surface (IV) of the inner glass plate (2). The thermoplastic interlayer (3) and / or the inner glass plate (2) are colored. The thermoplastic interlayer (3) and the inner glass plate (2), together with the heat radiation reflective coating (5) disposed on the inner surface (IV), have a light transmittance TL of less than 0.5%. 3+2+5 , The outer glass plate (1) has a light transmittance TL1 greater than 90%, and the laminated carrier glass plate (100) has a total transmitted thermal radiance TTS of up to 13%. 100 .

2. The laminated carrier glass plate (100) according to claim 1, wherein the thermoplastic intermediate layer (3) is colored and has a light transmittance TL3 of less than 0.5%.

3. The laminated carrier glass plate (100) according to claim 2, wherein the thermoplastic intermediate layer (3) comprises ink or colored pigment, particularly colored pigment.

4. The laminated carrier glass plate (100) according to any one of claims 1 to 3, wherein the inner glass plate (2) is tinted and the inner glass plate (2) having a heat radiation reflective coating (5) disposed on the inner surface (IV) has a light transmittance TL of less than 0.5%. 2+5 .

5. The laminated carrier glass plate (100) according to claim 4, wherein the inner glass plate (2) contains ink or colored pigment, particularly colored pigment.

6. The laminated carrier glass plate (100) according to any one of claims 1 to 5, wherein the laminated carrier glass plate (100) has a light transmittance TL of less than 0.3%, preferably less than 0.1%. 100 .

7. The laminated carrier glass plate (100) according to claim 6, wherein the laminated carrier glass plate (100) has a light transmittance TL of 0.0%. 100 .

8. The laminated carrier glass plate (100) according to any one of claims 1 to 7, wherein the sun protection coating (4) comprises a layer system having at least one metal layer, particularly at least one metallic silver layer, embedded between dielectric oxide layers or nitride layers.

9. The laminated carrier glass panel (100) according to claim 8, wherein the sun-protective coating (4) has at least the following layers or layer sequence, arranged in a specified order from the outer glass panel (1) to the inner glass panel (2): - First dielectric layer or layer sequence - First silver layer, - Second dielectric layer or layer sequence - Second silver layer, - The third dielectric layer or layer sequence - The third silver layer, and - The fourth dielectric layer or layer sequence.

10. The laminated carrier glass plate (100) according to any one of claims 1 to 9, wherein the heat radiation reflective coating (5) comprises indium tin oxide, antimony or fluorine-doped tin oxide, or aluminum-doped zinc oxide, or gallium-doped zinc oxide, wherein indium tin oxide is preferred.

11. The laminated carrier glass plate (100) according to any one of claims 1 to 10, wherein the thermoplastic intermediate layer (3) and / or the inner glass plate (2) is colored black.

12. A method for manufacturing a laminated carrier glass plate (100) according to any one of claims 1 to 11, wherein at least (a) A stacking sequence is provided comprising an outer glass plate (1) having an outer surface (I) and an inner surface (II), an inner glass plate (2) having an outer surface (III) and an inner surface (IV), and a thermoplastic interlayer (3), wherein the thermoplastic interlayer (3) is disposed between the outer glass plate (1) and the inner glass plate (2), a sun-protective coating (4) is disposed on the inner surface (II) of the outer glass plate (1), and a heat-reflective coating (5) is disposed on the inner surface (IV) of the inner glass plate (2), wherein the thermoplastic interlayer (3) and / or the inner glass plate (2) are colored, and the thermoplastic interlayer (3) and the inner glass plate (2), together with the heat-reflective coating (5) disposed on the inner surface (IV), have a light transmittance TL of less than 0.5%. 3+2+5 Furthermore, the outer glass plate (1) has a light transmittance TL1 greater than 90%; (b) The stacked sequence is connected by lamination.

13. Use of the laminated vehicle glass panel (100) according to any one of claims 1 to 11 in a land, air or water transport vehicle, wherein the laminated vehicle glass panel (100) is preferably a top glass panel.

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