Vehicle pane with an opaque cover layer

Abstract

Vehicle pane (10) at least comprising a substrate (1) made from glass with an outer surface (I) and an interior surface (II) wherein - the substrate (1) comprises, an opaque layer (5) applied on the interior surface (II) and covering at least 50 % of the total surface of the interior surface, - the opaque layer (5) comprises at least one layer (5.1) based on titanium-aluminum nitride.

Description

VEHICLE PANE WITH AN OPAQUE COVER LAYER

[0001] The invention relates to a vehicle pane with an opaque cover layer, to a method for the production thereof, and to the use thereof.

[0002] Composite panes, which comprise at least two panes and at least one polymer film adhesively bonded between the panes, have been used for decades in large quantities in various technical fields, in particular in building glazing and in vehicle construction.

[0003] In many industries, having a wide variety of product variants can be costly for businesses, especially those involved in manufacturing and distribution. The reason for this is because every variant of a product typically requires its own unique set of materials, production processes, and storage requirements. These costs can quickly add up, resulting in increased expenses that can ultimately impact a company's bottom line.

[0004] Therefore, reducing the number of product variants can be a smart business strategy for companies looking to streamline their operations and improve profitability. By focusing on a smaller range of products, companies can reduce production costs and provide a better customer experience, which can ultimately lead to increased sales and higher profits.

[0005] One example are vehicles with glass sunroofs and metal roofs. If an equipment manufacturer wants to sell a vehicle with glass sunroofs and metal aspect roofs, he needs different body shapes and therefore also different production lines and tools.

[0006] Therefore, for certain application such as sunroof, transparent and nontransparent aspect is researched. There is also a need to achieve a look like piano lacquer. This is known as a deep black glossy surface and is a hallmark of a distinctive noble surface.

[0007] One way to obtain a nontransparent aspect is to use tinted polymer films such as tinted PVBs to make the roofs opaque. However, such solution is expensive and can generates haze issues. Furthermore, it does not create the particular look researched.

[0008] It is also known to use black enamel on region in which the pane is adhesively bonded to the body, or regions in which electrical connections are placed, i.e. peripheral part of the glazing. However, black enamel has some disadvantages in processability such as higher production costs, sticking during the bending process, a gray appearance due to too low pre-firing temperatures, reduction of glass robustness... Therefore, it is not interesting to use it to cover large parts of a substate.

[0009] Accordingly, there is a need to develop vehicle panes with opaque layers that confers to the pane a nontransparent piano lacquer aspect and which have a good processability. The object of the present invention is to provide such an improved vehicle pane with an opaque layer, a method for the production thereof and a use thereof.

[0010] According to the invention, this object is achieved by a vehicle pane according to Claim 1. Preferred embodiments result from the dependent claims.

[0011] The invention concerns a vehicle pane (10) at least comprising a substrate (1 ) made from glass with an outer surface (I) and an interior surface (II) wherein- the substrate (1 ) comprises, an opaque layer (5) applied on the interior surface (II) and covering at least 50 % of the total surface of the interior surface,- the opaque layer (5) comprises at least one layer (5.1 ) based on titaniumaluminum nitride.

[0012] Preferably, the opaque cover layer (5) covers :- at least 60 %, at least 70, at least 80 %, at least 90 % of the total surface of the interior surface, and / or- at most 100 %, at most 98 %, most 97 %, at most 96 %, at most 95 %, at most 94 %, at most 93 %, at most 92 %, at most 91 %, at most 90 %, at most 85 %, at most 80 %, at most 75 %, at most 70 %, at most 65 %, at most 60 %, at most 55 %.

[0013] The substrate (1 ) further comprises an edge region (R) on the interior surface (II) arranged peripherally directly adjacent to a peripheral edge (K) of the substrate not covered by the opaque cover layer (5). That means that the opaque cover layer is not present on the interior surface directly adjacent to a peripheral edge (K).

[0014] By using a coating based on titanium aluminum nitride (TiAIN), it is possible to obtain an opaque cover layer that has a black appearance and creates a piano lacquer finish on the outside.

[0015] The object of the invention enables to obtain:- a Good TTS (~26%) due to 0%TL and a moderate absorption in the near infrared region NIR (),- non-transparent roof,- dark black appearance on side 1 , with tunable reflection aesthetics,- which can be combined with a solar control coating on side 3- coating which can be recycled very well in the float process,- as the coating is not sensitive to the corrosion, no demarging area is required (less complex process in transformation line).

[0016] The opaque cover layer of the invention is used to cover an important part of the surface of the substrate and not only particular regions.

[0017] The vehicle pane comprises at least one substrate made from glass with an outer surface (side I), an interior surface (side II) and an edge region R arranged peripherally directly adjacent to the peripheral edge of the substrate. According to one embodiment, the substrate (1 ) does not comprise an opaque cover layer in the edge region on the interior surface.

[0018] The vehicle pane according to the invention preferably comprises a second substrate, which is connected to the substrate via a thermoplastic intermediate layer to form a composite pane. The second substrate has an outer surface, also referred to as side III, and an interior surface, also called side IV. The thermoplastic intermediate layer connects the interior surface (side II) of the substrate and the outer surface (side III) of the second substrate wherein the substrate represents the outer pane and the second substrate represents the inner pane. Preferably, the opaque cover layer (5) is arranged on the interior surface (II) of the substrate (1 ). Preferably, a sun protection coating (4) is applied on the exterior surface (III) of the second substrate.

[0019] The opaque cover layer based on titanium-aluminum nitride has no negative effects on the float process and the product quality of the glass panes produced therein, so that the vehicle panes according to the invention have good recyclability. In addition, layers based on titanium-aluminum nitride have very good thermomechanical resistance, which, on the one hand, facilitates the transport and further processing of the panes in the production process and, on the other hand, ensures a long product life. The latter applies primarily if the titanium-aluminum nitride layer in the installation position of the vehicle pane in the vehicle represents a surface of the vehicle pane that is exposed to the environment. Furthermore, layers based on titanium-aluminum nitride are heat-resistant and oxidation-resistant so that they can be applied to the vehicle pane prior to any bending thereof. In addition, layers based on titanium- aluminum nitride have a low surface roughness compared to enamel prints. As a result, the opaque layer according to the invention is suitable for applying further functional layers, such as infrared-reflecting and / or electricallyconductive coatings, on its surface. On an opaque cover print made from enamel, this is not possible or not possible with sufficient coating quality.

[0020] The layer based on titanium-aluminum nitride is preferably a non conductive coating material. As it is non conductive and thereby has a relatively high transparency in the infrared, it is mean that high frequency signals will not be attenuated by the coating.

[0021] Preferably, the opaque layer is applied directly to the substrate, i.e. , no further layers are present between this layer and the substrate.

[0022] The opaque layer can be adapted to the dimensions of the vehicle pane. According to one embodiment, the opaque layer is not formed peripherally along the peripheral edge of the pane in the edge region of the vehicle pane.

[0023] Preferably, the opaque cover layer consists of a single layer based on titanium-aluminum nitride. A single layer is sufficient in this case in order to obtain the desired opaque properties. Moreover, the deposition of a single layer is more cost-effective than that of a multilayer stack.

[0024] All the describes light features are obtained according to the principles and methods of the ISO 9050 standard relating to the determination of the light and solar features of the glazings used in glass for the construction industry. The light characteristics are measured using the illuminant D65 at 2° perpendicularly to the material mounted in a single glazing (unless otherwise indicated). TL corresponds to light transmission in the visible range in %.

[0025] The opaque cover layer within the meaning of the invention is a layer that prevents the view through the composite pane. In this case, at most 5%, preferably at most 2%, particularly preferably at most 1 %, in particular at most 0.1 %, of the light of the visible spectrum in the wavelength range of 380 nm to 780 nm is transmitted through the opaque cover layer.

[0001] The vehicle pane (10) can have a light transmission of less than 5%, less than 2%, less than 1 % or less than 0.1 %, when the light transmission is measured on a surface comprising the opaque layer.

[0026] The term "flatly arranged on top of one another" is understood to mean that the projection of a first layer into the plane of a second layer is at least partially congruent with the second layer.

[0027] If a layer is formed “based on” a material, the layer consists predominantly of this material, in particular substantially of this material, in addition to any impurities or doping. The layer based on titanium-aluminum nitride thus predominantly consists of titanium-aluminum nitride.

[0028] The layer based on titanium-aluminum nitride preferably contains at least 90 percent by weight titanium-aluminum nitride, particularly preferably at least 95 percent by weight titanium-aluminum nitride and particularly preferably at least 99 percent by weight titanium-aluminum nitride. This results in a layer with good mechanical stability and heat resistance. The layer based on titanium-aluminum nitride is particularly preferably doped with chromium, silicon, tungsten, molybdenum, zirconium, hafnium, vanadium, niobium and / or tantalum, preferably chromium and / or silicon. This improves the opacity and / or the thermomechanical properties of the layer. This also enables to modify the reflection color according to specific customer wishes, e.g. to obtain a more greyisch reflection aesthetics if desired.

[0029] Furthermore, the layer based on titanium-aluminum nitride can contain carbon or oxygen, as a result of which the corresponding carbides (TiAICN) or oxides (TiAION) are at least partially formed. The addition of carbon improves the mechanical properties of the layer. A certain content of oxygen can result from partial oxidation of the layer. The oxides, nitrides and carbides mentioned can be deposited stoichiometrically, hypostoichiometrically or hyperstoichiometrically (even if a stoichiometric total formula is indicated forbetter understanding). They may have dopings, e.g., chromium, tungsten, molybdenum, zirconium, hafnium, vanadium, niobium and / or tantalum.

[0030] The layer based on titanium-aluminum nitride preferably has a ratio of titanium to aluminum Ti / AI between 40 atomic percent to 60 atomic percent and 60 atomic percent to 40 atomic percent. A ratio of titanium to aluminum between 45 atomic percent Ti 1 55 atomic percent Al and 55 atomic percent Ti 145 atomic percent Al has proven to be particularly advantageous. In particular, titanium and aluminum are in each case present at approximately 50 atomic percent.

[0031] The layer based on titanium-aluminum nitride preferably has a thickness of 100 nm to 5000 nm, particularly preferably 200 nm to 3000 nm, in particular 500 nm to 2500 nm. Good opaque properties could be achieved in these ranges.The opaque layer preferably can comprise an adhesion-promoting layer, which is attached directly to the substrate between the substrate and the layer based on titanium-aluminum nitride. The term "directly to the substrate" means that no further layers are located between the adhesion-promoting layer and the substrate. The adhesion-promoting layer improves the adhesion of the opaque cover layer to the substrate. The adhesion-promoting layer preferably has a thickness of 5 nm to 100 nm, particularly preferably of 10 nm to 70 nm, in particular of 10 nm to 50 nm. In these ranges, there is a sufficient improvement in the adhesion of the opaque cover layer with the smallest possible layer thickness of the adhesion-promoting layer, which ensures cost-effective deposition. Adhesion-promoting layers comprising silicon oxide, silicon nitride and / or aluminum nitride have proven to be particularly advantageous with regard to their adhesion-promoting properties, wherein silicon oxide is in particular preferred.

[0032] According to one embodiment, the substrate (1 ) further comprises an edge region (R) on the interior surface (II) arranged peripherally directly adjacent to a peripheral edge (K) of the substrate. This edge region can be covered by an opaque cover print cover layer based on enamel, preferably black enamel.

[0033] The opaque cover print currently comprised black enamel composed as a type of ceramic composite made from glass frits with further elements. Printed enamel containing SiO2, Bi2O3, ZnO and pigments are preferably used. Enamels comprising these constituents are known and are produced, for example, by baking printing pastes into glass surfaces. Suitable printing pastes for automotive glazings and building glazings are commercially available and generally contain solvents in addition to the constituents mentioned. The solvent evaporates during the baking process and is no longer present in the resulting enamel. These pigments containing commercially available printing pastes are used to color the pane for aesthetic reasons and to protect the edge bonding of the panes from light.

[0034] In addition, the opaque cover layer can contain a protective layer, which is attached to the surface of the layer based on titanium-aluminum nitride that faces away from the substrate. The protective layer prevents the oxidation of the layer based on titanium-aluminum nitride, in particular in the case of temperature treatments, such as during bending of the substrate. The protective layer preferably comprises silicon nitride and / or aluminum nitride.

[0035] In an embodiment, the opaque layer consists of a layer based on titanium-aluminum nitride. In a second embodiment, the opaque layer consists of an adhesion promoter layer applied directly to the substrate and a layer based on titanium-aluminum nitride, which is located on the adhesion promoter layer. In a third embodiment, the opaque cover layer consists of a layer based on titanium-aluminum nitride, which is located on the substrate, and a cover layer applied thereto. In a fourth embodiment, the opaque cover layer consistsof, starting from the substrate in this order, an adhesion promoter layer, a layer based on titanium-aluminum nitride, and a protective layer.

[0036] One of the substrate may have further suitable coatings known per se, e.g., anti-reflective coatings, non-stick coatings, anti-scratch coatings, photocatalytic coatings, reflection coatings, sun protection coatings (also referred to as IR-reflecting coatings), and / or heat protection coatings (also known as low-E coatings). These coatings are preferably applied above the opaque cover layer. This has the advantage that the coating is optically concealed in the edge region of the substrate in the view through the substrate.

[0037] The optionally sun protection coating reflects portions of the incident solar radiation outside the visible spectral range, in particular in the infrared spectral range. The sun protection coating reduces the heating of the vehicle interior by direct solar irradiation. The sun protection coating comprises at least one functional layer containing silver. In an advantageous embodiment, the sun protection coating comprises two or three functional layers. Sun protection coatings with a plurality of functional layers enable high reflectivity for infrared radiation with simultaneously high transmission in the visible spectral range.

[0038] The thickness of each functional layer of the sun protection coating is preferably 5 nm to 25 nm, particularly preferably 10 nm to 20 nm. The total layer thickness of all functional layers of the sun protection coating is preferably 20 nm to 80 nm, particularly preferably 30 nm to 60 nm. In these ranges for the thickness of the functional layer and the total thickness of all functional layers, particularly good results with regard to the sun protection function and the transparency are achieved. The sun protection coating preferably comprises at least one dielectric layer. Each functional layer is particularly preferably arranged between two dielectric layers. The functional layers and the dielectric layers are preferably arranged in such a way that at least one dielectric layer is arranged between each two adjacent functional layers between which no further functional layer is arranged, and that at least onefurther dielectric layer is arranged above the uppermost functional layer, and that at least one further dielectric layer is arranged below the lowermost functional layer. The dielectric layers of the sun protection coating preferably contain at least silicon nitride. The silicon nitride can have dopings, in particular aluminum. The dielectric layers preferably have thicknesses of 10 nm to 100 nm, particularly preferably of 20 nm to 70 nm. The dielectric layers of the sun protection coating can, however, also contain other suitable materials known to the person skilled in the art. Dielectric layer are chosen from oxide, nitride or oxynitride of one or more elements selected from silicon, aluminum, zinc, tin, zirconium, titanium, bismuth and / or niobium e.g., at least one metal oxide, such as SnO2, Bi20s, TiO2, ZnO, and / or at least one metal nitride, such as Si N , AIN. The sun protection coating can comprise further layers, which are known per se to the person skilled in the art, e.g., smoothing layers and / or blocker layers.

[0039] Such a sun protection coating comprising functional silver layers can be heated by applying an electrical voltage. The opaque cover layer according to the invention is preferably conductive for electrical current, wherein an electrical conductivity of preferably at least 10’8S / cm, particularly preferably at least 10’7S / cm, is present. This is particularly advantageous if the described sun protection coating and / or other electrically conductive coatings are to be applied to the opaque cover layer, i.e. , above the opaque cover layer. Electrical contacting of the electrically conductive coating can, in this case, take place with the aid of the electrically conductive opaque cover layer.

[0040] If a first layer is arranged above a second layer, this means, in the sense of the invention, that the first layer is arranged further away from the substrate on which the coating is applied than the second layer. If a first layer is arranged below a second layer, this means, in the sense of the invention, that the second layer is arranged further away from the substrate than the first layer. With respect to the sun protection coating and the opaque cover layer, this meansthat a sun protection coating applied above the opaque cover layer is further away from the substrate surface than the opaque layer.

[0041] An opaque cover layer on the outer pane can be applied to the interior surface of the outer pane and / or to the outer surface of the outer pane. In this case, the interior surface of the outer pane is preferred in that the opaque cover print is protected from weather effects. Particularly preferably, at least one opaque cover layer in the form of an opaque cover print is applied on the interior surface of the outer pane and / or the outer surface of the inner pane. An opaque cover print applied to the outer surface of the inner pane also conceals the view from the vehicle interior through the composite pane to the outside. For example, components, such as electrical connections, laminated into the composite pane can be concealed. There is also the wish on the part of the customer to be able to freely select the position of the cover print and, if necessary, to also be able to apply it to the interior surface or outer surface of the inner pane.

[0042] In a first preferred embodiment, the substrate (1 ) forms the outer pane of the composite pane and the opaque cover layer is applied on the interior surface of the substrate.

[0043] A sun protection coating is applied on the outside surface of the substrate (2). The sun protection coating can in particular be heated and comprises bus bars in the edge region. The bus bars are optically concealed by the opaque cover layer.

[0044] The opaque cover layer can be applied by physical or chemical vapor deposition (PVD or CVD), atmospheric plasma or cold gas spraying. The method use local deposition or masking techniques. With these processes, it is very easy to apply a coating on large areas such as a complete roof panel. Additionally, we can also coat this material on curved substrate if needed.

[0045] Preferably, the opaque cover layer is a coating applied by cathode sputtering ("sputtered on", in particular a coating applied by magnetic-field- assisted cathode sputtering (“magnetron sputtering”). An optionally present sun protection coating can be applied in the same way. This has the advantage that both the opaque cover layer and the sun protection coating can be deposited using the same method.

[0046] The vehicle pane comprising a substrate and a second substrate, which are laminated to one another to form a composite pane, is preferably a windshield. The optionally present sun protection coating is in the see-through region of the composite pane. In one embodiment of the windshield for a motor vehicle, the total transmission through the composite pane is at least 70% based on light type A. The term "total transmission" relates to the method defined by ECE-R 43, Annex 3, Section 9.1 for testing the light transmission of motor vehicle panes.

[0047] The second substrate and the substrate preferably contain or consist of glass, particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass, alumino silicate glass, or clear plastics, preferably rigid clear plastics, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride, and / or mixtures thereof.

[0048] The thickness of the substrate and of the optionally present second substrate (outer pane and inner pane) can vary greatly and be adapted to the requirements of the individual case, wherein the pane thickness also depends on the use of the pane as an inner pane or outer pane. Preferably, panes with the standard thicknesses of 0.5 mm to 5 mm and preferably of 1.0 mm to 2.5 mm are used. The size of the panes can vary widely and depends upon the use.

[0049] The vehicle pane may have any three-dimensional shape. Preferably, the outer pane and the inner pane do not have any shadow zones, so that theycan be coated, for example, by cathode sputtering. The outer pane and the inner pane are preferably flat or slightly or strongly curved in one direction or in several directions of the space.

[0050] The thermoplastic intermediate layer contains or consists of at least one thermoplastic polymer, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), and / or polyurethane (PU), or copolymers or derivatives thereof, where applicable, in combination with polyethylene terephthalate (PET). However, the thermoplastic intermediate layer may, for example, also contain polypropylene (PP), polyacrylate, polyethylene (PE), polycarbonate (PC), polymethyl methacrylate, polyvinyl chloride, polyvinyl acetate resin, casting resin, acrylate, fluorinated ethylene propylene, polyvinyl fluoride, and / or ethylene tetrafluoroethylene, or a copolymer or mixture thereof.

[0051] The thermoplastic intermediate layer is preferably designed as at least one thermoplastic composite film and contains or consists of polyvinyl butyral (PVB), particularly preferably of polyvinyl butyral (PVB), and additives, such as plasticizers, known to the person skilled in the art. The thermoplastic intermediate layer preferably contains at least one plasticizer.

[0052] Plasticizers are chemical compounds that make plastics softer, more flexible, smoother and / or more elastic. They shift the thermoelastic range of plastics to lower temperatures so that the plastics have the desired more elastic properties in the range of the operating temperature. Preferred plasticizers are carboxylic esters, in particular low-volatile carboxylic esters, fats, oils, soft resins and camphor. Further plasticizers are preferably aliphatic diesters of tri- or tetraethylene glycols. Particular preferably used as plasticizers are 3G7, 3G8 or 4G7, wherein the first number denotes the number of ethylene glycol units and the last digit denotes the number of carbon atoms in the carboxylic acid portion of the compound. 3G8 thus stands for triethylene glycol bis(2-ethylhexanoate), i.e., for a compound of the formula C4H9CH (CH2CH3) CO (OCH2CH2)3O2CCH (CH2CH3) C4H9.

[0053] The thermoplastic intermediate layer based on PVB preferably contains at least 3 percent by weight, preferably at least 5 percent by weight, particularly preferably at least 20 percent by weight, even more preferably at least 30 percent by weight and in particular at least 35 percent by weight of a plasticizer. The plasticizer contains or consists, for example, of triethylene glycol bis(2- ethylhexanoate).

[0054] The thermoplastic intermediate layer may be formed by a single film or also by more than one film. The thermoplastic intermediate layer may be formed by one or more thermoplastic films arranged one above the other, wherein the thickness of the thermoplastic intermediate layer is preferably 0.25 mm to 1 mm, typically 0.38 mm or 0.76 mm.

[0055] The thermoplastic intermediate layer may also be a functional thermoplastic intermediate layer, in particular an intermediate layer with acoustically damping properties, an intermediate layer reflecting infrared radiation, an intermediate layer absorbing infrared radiation, and / or an intermediate layer absorbing UV radiation. Thus, the thermoplastic intermediate layer may, for example, also be a band filter film that blocks out narrow bands of visible light.

[0056] Furthermore, the invention comprises a method for producing a vehicle pane according to the invention. The method comprises at least the steps of: a) providing a substrate having an outer surface (side I), an interior surface (side II), b) applying an opaque cover layer, at least comprising a layer based on titanium-aluminum nitride in the interior surface (side II).

[0057] The layer based on titanium-aluminum nitride is, in this case, applied by means of physical or chemical vapor deposition.

[0058] In a preferred embodiment, the substrate is laminated after step b) to a second substrate, with a thermoplastic intermediate layer between them, to form a composite pane.

[0059] In a preferred embodiment of the method, a sun protection coating is applied, in a step c), by means of physical vapor deposition. The sun protection coating can preferably be heated, for which purpose electrical conductors for applying an electrical voltage are applied to the sun protection coating.

[0060] The lamination of the layer stack takes place under the action of heat, vacuum, and / or pressure, wherein the individual layers are connected (laminated) to one another by at least one thermoplastic intermediate layer. Methods known per se for producing a composite pane can be used. For example, so-called autoclave processes can be carried out at an elevated pressure of about 10 bar to 15 bar and temperatures of 130°C to 145°C over about 2 hours. Vacuum bag or vacuum ring methods known per se operate, for example, at approximately 200 mbar and 130°C to 145°C. The outer pane, the inner pane, and the thermoplastic intermediate layer may also be pressed in a calender between at least one roller pair to form a composite pane. Systems of this type for producing composite panes are known and usually have at least one heating tunnel upstream of a pressing unit. The temperature during the pressing process ranges, for example, from 40°C to 150°C. Combinations of calender and autoclave methods have proven particularly successful in practice. Vacuum laminators can be used as an alternative. They consist of one or more heatable and evacuable chambers, in which the outer pane and the inner pane can be laminated within, for example, approximately 60 minutes at reduced pressures of 0.01 mbar to 800 mbar and temperatures of 80°C to 170°C.

[0061] Methods for applying the opaque cover layer and the sun protection coating have already been explained in the description of the layers themselves.

[0062] The method features explained in the description of the vehicle pane according to the invention also apply to the method according to the invention, and vice versa.

[0063] The vehicle pane according to the invention is preferably used as a roof pane, rear pane, side pane in vehicles for traffic on land, in the air or in water, particularly preferably in motor vehicles. In particular as a sunroof.

[0064] The various embodiments of the invention may be implemented individually or in any combinations. In particular, the features mentioned above and to be explained below can be used not only in the specified combinations but also in other combinations or alone without departing from the scope of the present invention.

[0065] The invention is explained in more detail below with reference to exemplary embodiments, wherein reference is made to the accompanying figures. In a simplified, not-to-scale representation:Figure 1 a shows a plan view of a vehicle pane according to the invention, Figure 1 b shows a cross section through the vehicle pane of Figure 1 a along the section line AA‘,Figure 2a shows a plan view of a further embodiment of the vehicle pane according to the invention as a composite pane,Figure 2b shows a cross section through the vehicle pane of Figure 2a along the section line BB‘,Figures 3a-d show various embodiments of the opaque cover layer according to the invention of the vehicle pane.

[0066] Figures 1 a and 1 b show a plan view of a vehicle pane 10 according to the invention and a cross-sectional view of the vehicle pane 10 along the section line AA‘. The vehicle pane 10 comprises a substrate 1. The substrate 1 has an outer surface I, which in the installed state in a vehicle body faces theenvironment, and an interior surface II, which in the installed state is oriented toward the vehicle interior. An opaque cover layer 5 is applied to the interior surface II. Possible embodiments of the opaque cover layer 5 are described in Figures 3a-d.

[0067] Figures 2a and 2b show a plan view and a cross-sectional view of an exemplary embodiment of the vehicle pane 10 according to the invention as a windshield. The cross-sectional view of Figure 2b corresponds to section line BB‘ of the vehicle pane 10, as indicated in Figure 2a.

[0068] The vehicle pane 10 as a windshield is a composite pane comprising a substrate 1 as an outer pane and a second substrate 2 as an inner pane, which are connected via a thermoplastic intermediate layer 3. The substrate 1 has an outer surface I and an interior surface II, while the second substrate 2 has an exterior surface III and an interior surface IV. The interior surface II of the substrate 1 is connected to the exterior surface III of the second substrate 2 via the thermoplastic intermediate layer 3 to form a composite pane. The outer surface I of the substrate 1 faces away from the thermoplastic intermediate layer 3 and is, at the same time, the outer surface of the composite pane. The interior surface II of the substrate 1 and the outer surface III of the second substrate 2 each face the intermediate layer 3. The interior surface IV of the second substrate 2 faces away from the thermoplastic intermediate layer 3 and is, at the same time, the surface of the composite pane 10 that faces the vehicle interior in the installed state. It is understood that the composite pane 10 can have any suitable geometric shape and / or curvature. As a composite pane 10, it typically has a convex curvature.

[0069] The substrate 1 and the second substrate 2 each consist of glass, preferably thermally pre-stressed soda-lime glass, and are transparent to visible light. The thermoplastic intermediate layer 3 comprises a thermoplastic plastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) and / or polyethylene terephthalate (PET).

[0070] The windshield has a peripheral edge K, which is composed of an engine edge M, a roof edge D, and two side edges S. The edge that is adjacent to the engine hood in the installation position of the windshield in a vehicle body is referred to as the engine edge M. Located opposite the engine edge M is the roof edge, which adjoins the vehicle roof in the installed state. The engine edge M and the roof edge D are connected by two mutually opposite side edges S. The cover layer 5 is opaque and prevents the view to structures arranged on the inside of the vehicle pane 10. The opaque cover layer 5 prevents the view through the composite pane 10, as a result of which, for example, an adhesive strand for adhesively bonding the composite pane 10 into a vehicle body is not visible from the vehicle environment.

[0071] A sun protection coating 4, which is located above the opaque cover layer 5 is applied flatly to the outside surface III of the substrate 2. The opaque cover layer 5 and the sun protection coating 4 are applied by means of physical vapor deposition. Possible embodiments of the opaque cover layer 5 are described in Figures 3a-d.

[0072] Figures 3a-d show various embodiments according to the invention of the opaque cover layer 5, which is attached to the interior surface II of the substrate 1 . According to Figure 3a, the opaque cover layer 5 consists of a layer 5.1 based on titanium-aluminum nitride. According to Figure 3b, the reflection layer 9 consists of an adhesion-promoting layer 5.2 and a layer 5.1 based on titanium-aluminum nitride, which are attached in this order to the interior surface II of the substrate 1 . Figure 3c shows an opaque cover layer 5 consisting of a layer 5.1 based on titanium-aluminum nitride and a protective layer 5.3, which are applied in this order to the interior surface II of the substrate 1 . In a further embodiment according to Figure 3d, the opaque cover layer 5 consists of, starting from the interior surface II of the substrate 1 in this order, an adhesion-promoting layer 5.2, a layer 5.1 based on titanium- aluminum nitride, and a protective layer 5.3.List of reference signs10 Vehicle pane1 Substrate2 Second Substrate3 Thermoplastic intermediate layer4 Sun protection coating5 Opaque cover layer5.1 Layer based on titanium-aluminum nitride5.2 Adhesion-promoting layer5.3 Protective layerR Edge regionK Peripheral edgeM Engine edgeD Roof edgeS Side edgesI Outer surface of the outer pane 111 Interior surface of the outer pane 1III Outer surface of the inner pane 2IV Interior surface of the inner pane 2A-A Section lineBB‘ Section line

Claims

Claims1. Vehicle pane (10) at least comprising a substrate (1 ) made from glass with an outer surface (I) and an interior surface (II) wherein- the substrate (1) comprises, an opaque layer (5) applied on the interior surface (II) and covering at least 50 % of the total surface of the interior surface,- the opaque layer (5) comprises at least one layer (5.1 ) based on titaniumaluminum nitride.

2. Vehicle pane (10) according to Claim 1 , wherein the opaque cover layer (5) covers at least 80 % of the total surface of the interior surface.

3. Vehicle pane (10) according to one of Claims 1 to 2, wherein the layer based on titanium-aluminum nitride has a ratio of titanium to aluminum Ti / AI between 40 atomic percent to 60 atomic percent and 60 atomic percent to 40 atomic percent.

4. Vehicle pane (10) according to any one of the preceding claims, wherein it has a light transmission of less than 5%, when the light transmission is measured on a surface comprising the opaque layer.

5. Vehicle pane (10) according to any one of the preceding claims, wherein substrate (1 ) further comprises an edge region (R) on the interior surface (II) arranged peripherally directly adjacent to a peripheral edge (K) of the substrate not covered by the opaque cover layer (5).

6. Vehicle pane (10) according to any one of the preceding claims, wherein the substrate (1 ) further comprises an edge region (R) on the interior surface (II) arranged peripherally directly adjacent to a peripheral edge (K) of the substrate covered by an opaque print cover layer based on enamel.

7. Vehicule pane (10) according to any one of the preceding claims, wherein the layer (5.1 ) based on titanium-aluminum nitride contains at least 90 percent by weight titanium-aluminum nitride, preferably at least 95 percent by weight titanium-aluminum nitride, and particularly preferably at least 99 percent by weight titanium-aluminum nitride.

8. Vehicle pane (10) according to one of Claims 1 to 7, wherein the layer(5.1 ) based on titanium-aluminum nitride is doped with chromium, tungsten, molybdenum, zirconium, hafnium, vanadium, niobium and / or tantalum and optionally contains carbon and / or oxygen.

9. Vehicle pane (10) according to one of Claims 1 to 8, wherein the layer(5.1 ) based on titanium-aluminum nitride has a thickness of 100 nm to 5000 nm, preferably 200 nm to 3000 nm, particularly preferably 500 nm to 2500 nm.

10. Vehicle pane (10) according to one of Claims 1 to 9, wherein the opaque cover layer (5) comprises an adhesion-promoting layer (5.2), which is attached directly to the substrate (1 ) between the substrate (1 ) and the layer (5.1 ) based on titanium-aluminum nitride and preferably has a thickness of 5 nm to 100 nm, particularly preferably 10 nm to 70 nm, in particular 10 nm to 50 nm, and contains, for example, silicon oxide, silicon nitride and / or aluminum nitride.

11. Vehicle pane (10) according to one of Claims 1 to 10, wherein the opaque cover layer (5) comprises a protective layer (5.3) applied to the layer(5.1 ) based on titanium-aluminum nitride on the surface thereof facing away from the substrate (1 ).

12. Vehicle pane (10) according to one of Claims 1 to 11 , at least comprising a second substrate (2) having an outer surface (III) and an interior surface (IV) and a thermoplastic intermediate layer (3), wherein the thermoplastic intermediate layer (3) connects the interior surface (II) of the substrate (1 ) andthe outer surface (III) of the second substrate (2) to one another to form a composite pane.

13. Vehicle pane (10) according to Claim 12, wherein the substrate (1 ) forms the outer pane of the composite pane and the opaque cover layer (5) is arranged on the interior surface (II) of the substrate (1 ).

14. Vehicle pane (10) according to Claim 12 or 13, wherein a sun protection coating (4) is applied on the exterior surface (III) of the second substrate.

15. Method for producing a vehicle pane (10) according to one of Claims 1 to 14, wherein a) a substrate (1 ) having an outer surface (I) and an interior surface (II) is provided, b) an opaque cover layer (5) at least comprising a layer (5.1 ) based on titanium-aluminum nitride is applied at least on the interior surface (II) and covers at least 50 % of the total surface of the interior surface, wherein the layer (5.1 ) based on titanium-aluminum nitride is applied by means of physical or chemical vapor deposition.

16. Method according to Claim 15, wherein after step b), the substrate (1 ) is laminated to a second substrate (2), with a thermoplastic intermediate layer (3) between them, to form a composite pane, preferably the second substrate comprise a sun protection coating (4) applied to the substrate (2) by means of physical vapor deposition.

17. Use of a vehicle pane according to one of Claims 1 to 14 as a roof pane, rear pane, side pane of a vehicle.

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