Carrier glass sheet with opaque cover layer

Abstract

The invention relates to a vehicle pane (10) comprising at least a substrate (1) made of glass, said substrate (1) having an outer side surface (I), an inner side surface (II) and an edge region (R) arranged circumferentially directly adjacent to a peripheral edge (K) of the substrate (1), the substrate (1) comprising an opaque cover layer (5) on the outer side surface (I) and / or the inner side surface (II) in the edge region (R) at least in sections, and the opaque cover layer (5) comprises at least one titanium aluminum nitride-based layer (5.1).

Description

[0001] The invention relates to a carrier glass plate with an opaque covering layer, to a manufacturing method thereof, and to a use thereof.

[0002] Laminated glazing panels comprising at least two glass panes and at least one polymer film bonded between the glass panes have been used for decades in a wide variety of technical fields, in particular in architectural glazing and carrier construction. The choice of materials used and the dimensioning of the components are carried out according to the requirements of the specific intended purpose, in particular with regard to the desired mechanical load-bearing capacity of the finished glazing, taking into account the boundary conditions set by the frame and any accessories.

[0003] US 3,437552 A discloses a laminated glass pane comprising two glass panes and an intermediate polyvinyl butyral (PVB) layer.

[0004] US Pat. No. 6,708,595 B1 discloses an armored composite glass pane for a motor vehicle, which comprises a stacked sequence of a plurality of glass panes and a plurality of adhesive interlayers therebetween.

[0005] Motor vehicle glazing panels often include an opaque cover print, also called black print or black enamel, to cover specific areas of the glazing, such as where the glazing panel is bonded to the body, or where electrical connections are placed. In addition to optical concealment, the opaque cover print serves to protect the bond from the effects of UV light to avoid decomposition of the adhesive.

[0006] The opaque cover print currently used as a standard is a black enamel, which is composed in the form of a class of ceramic composite materials, which are made of glass frit and other elements. Preferably, a printing enamel containing SiO2, Bi2O3, ZnO and pigments is used. Enamels containing these ingredients are known and are produced, for example, by baking a printing paste to the glass surface. Printing pastes suitable for automotive glazing and architectural glazing are commercially available and usually contain solvents in addition to the ingredients mentioned. The solvent evaporates during the baking process and is no longer present in the resulting enamel. These commercially available printing pastes containing pigments are used to color the glass sheets for aesthetic purposes and to protect the edge bonding of the glass sheets from the influence of light. In the automotive field, in windshields and rear glass panels, opaque cover prints containing black enamel are usually applied in the edge area along the peripheral edge.

[0007] In the sustainable transformation of the economic cycle, cover prints made of black enamel are disadvantageous because such printed glass cannot be recycled in large quantities in the float process. The float process represents the most common and cost-effective production method for flat glass, and carrier assembly glass is especially manufactured by this method. In the float process, in addition to raw materials such as sand, glass fragments are also used as starting materials for recycling. Nowadays, fragments generated during the cutting process of float glass are mainly used. On the other hand, carrier glass plates printed with enamel are not very suitable for recycling in float glass systems because they contaminate the glass melt and are further processed to form low-quality products such as asphalt. This has an adverse effect on the overall CO2 balance.

[0008] Furthermore, the black enamel is applied using a variety of solvents which are questionable for health and environmental reasons. Finally, the process generally requires pre-sintering of the enamel glass, which represents an additional cost factor.

[0009] Furthermore, it is known that enameling of glass reduces its mechanical stability, wherein this effect can be quite significant, depending on the composition and thickness of the enamel. In order to apply the enamel to the glass, a printing paste is first applied, which is fired to give the enamel. In doing so, however, pores are formed in the enamel produced, defect sites corresponding to the respective pores are transferred to the underlying glass and thus lead to an undesirable reduction in strength.

[0010] With regard to pre-coated float glass, the firing of black enamels represents a particular challenge, especially if the coating is a coating with low emissivity (a so-called "low-E coating"). Low-E coatings absorb incoming heat poorly, whereas enamels absorb heat strongly. As a result, significant thermal gradients can occur during heating and cooling, and ultimately glass cracking can occur.

[0011] Therefore, there is a need for a carrier glass sheet having an opaque cover layer that does not affect the strength of the glass, that can be applied without the use of environmentally harmful solvents, and that can be recycled using the float glass process.

[0012] WO 2021136079A1 discloses a curved glass plate containing an inorganic layer, wherein the inorganic layer includes a light-transmitting color layer and a light-shielding layer. The light-transmitting color layer is formed of an inorganic oxide and / or an elemental metal. The light-transmitting color layer and the light-shielding layer can be attached to the same or opposite surfaces of the glass plate.

[0013] JP S63265844A describes a method for coating a glass substrate by magnetron sputtering, wherein a metal nitride layer is deposited.

[0014] EP 3756882 A1 discloses a carrier laminated glass pane with a sensor area, comprising an inner glass pane and an outer glass pane connected to each other via a thermoplastic interlayer, wherein an insert is attached between the inner glass pane and the outer glass pane outside the sensor area and causes a local variation in the thickness of the thermoplastic interlayer in the sensor area.

[0015] The object of the present invention is to provide such an improved carrier glass pane with an opaque cover layer, a method for its production and its use.

[0016] According to the invention, this object is achieved by a carrier glass pane according to claim 1. Preferred embodiments result from the dependent claims.

[0017] The carrier glass pane comprises at least one substrate made of glass, which has an outer surface (surface I), an inner surface (surface II) and an edge region arranged circumferentially directly adjacent to the outer peripheral edge of the substrate. In the edge region, the substrate comprises an opaque cover layer at least in sections on the outer surface and / or the inner surface. The opaque cover layer comprises at least one layer based on titanium aluminum nitride.

[0018] In the carrier laminated glass pane according to the invention, the opaque cover print customarily used in the edge region of the carrier glass pane according to the prior art is replaced by an opaque layer based on titanium aluminum nitride. The carrier glass pane according to the invention thus has no opaque cover print containing enamel. The exemption of the cover print based on enamel enables the recycling of the carrier glass pane in the float glass system. The opaque layer based on titanium aluminum nitride has no adverse effect on the product quality of the float process and the glass pane manufactured therein, so that the carrier glass pane according to the invention has good recyclability. In addition, the layer based on titanium aluminum nitride has very good thermomechanical resistance, which is beneficial on the one hand for the transportation and further processing of the glass pane in the production process, and on the other hand ensures a long product life. The latter is mainly applicable when the titanium aluminum nitride layer at the mounting position of the carrier glass pane in the carrier represents the surface of the carrier glass pane exposed to the environment. In addition, the layer based on titanium aluminum nitride is heat-resistant and oxidation-resistant, so that they can be applied to the carrier glass pane before any bending thereof. In addition, the layer based on titanium aluminum nitride has a low surface roughness compared to the enamel print. As a result, the opaque cover layer according to the invention is suitable for applying other functional layers on its surface, such as infrared reflecting and / or conductive coatings. On opaque cover prints made of enamel, this is not achievable or possible with sufficient coating quality.

[0019] Preferably, the opaque cover layer is applied directly to the substrate, ie no further layers are present between the layer and the substrate. As a result, any further layers applied to the carrier glass pane are hidden in the edge region by the opaque cover layer.

[0020] The opaque covering layer can be adapted to the dimensions of the carrier glass pane.The opaque covering layer is preferably formed circumferentially along the peripheral edge of the glass pane in the edge region of the carrier glass pane, wherein the width of the covering layer varies.

[0021] The opaque cover layer is preferably used to conceal the integration of a vehicle pane (for example as a rear pane, roof pane or windshield) into the body. This achieves a harmonious overall impression of the pane in the installed state. In addition, the opaque cover layer serves as UV protection for the adhesive material used.

[0022] Preferably, the opaque cover layer consists of a single layer based on titanium aluminum nitride. In this case, a single layer is sufficient to obtain the desired opaque properties. In addition, the deposition of a single layer is more cost-effective than the deposition of a multilayer stack.

[0023] The opaque covering layer can be applied to one or more glass sheet surfaces. An advantage of the invention in this respect is that the opaque covering layer is suitable for attachment to a freely exposed surface of the substrate. The surface on which the opaque covering layer is to be placed can thus be freely selected according to the wishes of the consumer. In the meaning of the present invention, an exposed surface is understood to mean a surface that is accessible and in direct contact with the surrounding atmosphere. It may also be referred to as an outer surface.

[0024] Within the meaning of the present invention, an opaque covering layer is a layer which prevents viewing through the laminated glass 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 in the visible spectrum in the wavelength range of 380 nm to 780 nm is transmitted through the opaque covering layer.

[0025] The term “flatly arranged one above the other” is understood to mean that a projection of the first layer onto the plane of the second layer at least partially overlaps the second layer.

[0026] If a layer is formed “based on” a material, then the layer consists essentially of this material, in particular substantially of this material, apart from any impurities or dopings. A layer based on titanium aluminum nitride thus consists essentially of titanium aluminum nitride.

[0027] The layer based on titanium aluminum nitride preferably contains at least 90% by weight of titanium aluminum nitride, particularly preferably at least 95% by weight of titanium aluminum nitride and particularly preferably at least 99% by weight of titanium aluminum nitride. This produces a layer with good mechanical stability and heat resistance. The layer based on titanium aluminum nitride is particularly preferably doped with chromium, tungsten, molybdenum, zirconium, hafnium, vanadium, niobium and / or tantalum. This improves the opacity and / or thermomechanical properties of the layer. In addition, the layer based on titanium aluminum nitride can contain carbon or oxygen, thereby at least partially forming corresponding carbides (TiAlCN) or oxides (TiAlON). The addition of carbon improves the mechanical properties of the layer. A certain amount of oxygen can be produced by partial oxidation of the layer. The oxides, nitrides and carbides mentioned can be deposited stoichiometrically, substoichiometrically or superstoichiometrically (even if the stoichiometric total formula is indicated for better understanding). They may have dopants, such as chromium, tungsten, molybdenum, zirconium, hafnium, vanadium, niobium and / or tantalum.

[0028] The layer based on titanium aluminum nitride preferably has a titanium to aluminum ratio Ti / Al of 40 to 60 atom % and 60 to 40 atom %. A titanium to aluminum ratio of 45 atom % Ti / 55 atom % Al to 55 atom % Ti / 45 atom % Al has proven to be particularly advantageous. In particular, titanium and aluminum are present in each case at approximately 50 atom %.

[0029] The titanium aluminum nitride-based layer 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 opacity properties can be achieved within these ranges.

[0030] The opaque cover layer preferably comprises an adhesion promoting layer, which is directly attached to the substrate between the substrate and the layer based on titanium aluminum nitride. The term "directly attached to the substrate" means that no other layer is 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 5nm to 100nm, particularly preferably 10nm to 70nm, particularly 10nm to 50nm. Within these ranges, the adhesion of the opaque cover layer is fully improved with the minimum possible layer thickness of the adhesion promoting layer, which ensures cost-effective deposition. It has been proven that the adhesion promoting layer comprising silicon oxide, silicon nitride and / or aluminum nitride is particularly advantageous in its adhesion promoting properties, wherein silicon oxide is particularly preferred.

[0031] Furthermore, the opaque cover layer preferably contains a protective layer which is attached to the surface of the titanium aluminum nitride-based layer facing away from the substrate. The protective layer prevents oxidation of the titanium aluminum nitride-based layer, in particular in the case of high temperature processing, for example during bending of the substrate. The protective layer preferably contains silicon nitride and / or aluminum nitride.

[0032] In a first preferred embodiment, the opaque cover layer consists of a layer based on titanium aluminum nitride. In a second preferred embodiment, the opaque cover layer consists of an adhesion promoter layer applied directly to the substrate and a layer based on titanium aluminum nitride located on the adhesion promoter layer. In a third preferred embodiment, the opaque cover layer consists of a layer based on titanium aluminum nitride located on the substrate and a cover layer applied thereon. In a fourth preferred embodiment, the opaque cover layer consists of, starting from the substrate, an adhesion promoter layer, a layer based on titanium aluminum nitride and a protective layer.

[0033] The substrate may have other suitable coatings known per se, such as antireflective coatings, non-stick coatings, anti-scratch coatings, photocatalytic coatings, reflective coatings, sun protection coatings (also known as IR reflective coatings) and / or heat protection coatings (also known as low-E coatings). These coatings are preferably applied over the opaque cover layer. This has the advantage that the coating is optically hidden in the edge region of the substrate when viewed through the substrate.

[0034] In the installed state, the reflective coating applied on the inner side of the opaque cover layer in the region of the opaque cover layer enables the carrier glass pane to be used as a projection surface, wherein a light source projects an image onto the reflective coating and the image is reflected to an observer.

[0035] The optional sunscreen coating reflects the part of the incident solar radiation outside the visible spectral range, in particular in the infrared spectral range. The sunscreen coating reduces the heating of the vehicle interior by direct solar radiation. The sunscreen coating comprises at least one functional layer containing silver. In an advantageous embodiment, the sunscreen coating comprises two or three functional layers. A sunscreen coating with a plurality of functional layers enables a high reflectivity for infrared radiation and at the same time a high transmittance in the visible spectral range.

[0036] The thickness of each functional layer of the sunscreen coating is preferably 5nm to 25nm, particularly preferably 10nm to 20nm. The total layer thickness of all functional layers of the sunscreen coating is preferably 20nm to 80nm, particularly preferably 30nm to 60nm. In these ranges of the thickness of the functional layer and the total thickness of all functional layers, particularly good results with respect to sunscreen function and transparency are achieved. The sunscreen coating preferably includes at least one dielectric layer. Each functional layer is particularly preferably arranged between two dielectric layers. The functional layer and the dielectric layer are preferably arranged in the following manner: at least one dielectric layer is arranged between every two adjacent functional layers, no further functional layer is arranged between the two adjacent functional layers, and at least one further dielectric layer is arranged above the topmost functional layer, and at least one further dielectric layer is arranged below the bottommost functional layer. The dielectric layer of the sunscreen coating preferably contains at least silicon nitride. Silicon nitride may have a dopant, in particular aluminum. The dielectric layer preferably has a thickness of 10nm to 100nm, particularly preferably 20nm to 70nm. However, the dielectric layer of the sun protection coating may also contain other suitable materials known to those skilled in the art, for example at least one metal oxide, such as SnO2, Bi2O3, TiO2, ZnO and / or at least one metal nitride, such as AlN. The sun protection coating may comprise further layers known per se to those skilled in the art, for example smoothing layers and / or barrier layers.

[0037] Such sun protection coatings comprising a functional silver layer can be heated by applying an electric voltage. The opaque cover layer according to the invention is preferably electrically conductive for electric current, wherein there are preferably at least 10 -8 S / cm, particularly preferably at least 10 -7 S / cm. It is particularly advantageous if the sunscreen coating and / or other conductive coating is to be applied to an opaque cover layer, i.e. above an opaque cover layer. In this case, the electrical contacting of the conductive coating can take place by means of the conductive opaque cover layer.

[0038] If the first layer is arranged above the second layer, this means in the sense of the present invention that the first layer is arranged further away from the substrate on which the coating is applied than the second layer. If the first layer is arranged below the second layer, this means in the sense of the present invention that the second layer is arranged further away from the substrate than the first layer. With regard to sunscreen coatings and opaque covering layers, this means that the sunscreen coating applied above the opaque covering layer is further away from the substrate surface than the opaque covering layer.

[0039] The carrier glass pane according to the invention preferably comprises a second glass pane which is connected to the substrate via a thermoplastic interlayer to form a laminated glass pane. The second glass pane has an outer side surface, also referred to as face III, and an inner side surface, also referred to as face IV. The thermoplastic interlayer connects the inner side surface of the substrate (face II) and the outer side surface of the second glass pane (face III), wherein the substrate represents the inner glass pane and the second glass pane represents the outer glass pane, or the thermoplastic interlayer connects the inner side surface of the second glass pane (face IV) and the outer side surface of the substrate (face I), wherein the second glass pane forms the outer glass pane and the substrate forms the inner glass pane.

[0040] The opaque covering layer on the outer glass pane can be applied to the inner surface of the outer glass pane and / or the outer surface of the outer glass pane. In this case, the inner surface of the outer glass pane is preferred because the opaque covering print is protected from weather influences. Particularly preferably, at least one opaque covering layer in the form of an opaque covering print is applied to the inner surface of the outer glass pane and / or the outer surface of the inner glass pane. The opaque covering print applied to the outer surface of the inner glass pane also hides the view from the inside of the carrier through the laminated glass pane to the outside. For example, components laminated into the laminated glass pane (such as electrical connections) can be hidden. Consumers also want to be able to freely choose the position of the covering print and, if necessary, also be able to apply it to the inner surface or the outer surface of the inner glass pane.

[0041] In a first preferred embodiment, the substrate forms the outer pane of a laminated glazing and an opaque cover layer is applied to the inner surface of the substrate. Particularly preferably, a sun protection coating is applied over the cover layer adjacent thereto, wherein the sun protection coating is particularly heatable and contains bus bars in the edge region. The bus bars are optically concealed by the opaque cover layer and, if the opaque cover layer is electrically conductive, electrical contacting of the sun protection coating is achieved at least partially via the opaque cover layer.

[0042] In a second preferred embodiment, the substrate represents the inner glass pane of a laminated glazing and an opaque covering layer is applied on the outer surface of the substrate and / or on the inner surface of the substrate, preferably on the outer surface of the substrate. The opaque covering layer has proven to be sufficiently stable for use on the surface facing the environment; however, the opaque covering layer is preferably arranged on the surface facing the thermoplastic interlayer.

[0043] The opaque cover layer can be applied by physical or chemical vapor deposition (PVD or CVD), atmospheric plasma or cold gas spraying. Preferably, the opaque cover layer is a coating applied by cathode sputtering ("sputtering on it"), in particular by magnetic field-assisted cathode sputtering ("magnetron sputtering"). The optional sunscreen coating can be applied in the same way. The advantage is that the same method can be used to deposit the opaque cover layer and the sunscreen coating.

[0044] The vehicle glass pane comprising a substrate and a second glass pane laminated to each other to form a laminated glass pane is preferably a windshield. The optional sun protection coating is in the see-through area of ​​the laminated glass pane. In one embodiment of a windshield for a motor vehicle, the total transmittance through the laminated glass pane is at least 70% based on class A light. The term "total transmittance" refers to the method for testing the light transmittance of a motor vehicle glass pane defined by ECE-R 43, Appendix 3, Section 9.1.

[0045] The second glass pane and the substrate preferably contain glass or consist of glass, the glass being particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass, aluminosilicate glass or transparent plastic, preferably hard transparent plastic, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and / or mixtures thereof.

[0046] The thickness of the substrate and of the optionally present second glass pane (outer glass pane and inner glass pane) can vary greatly and can be adapted to the requirements of the individual case, wherein the glass pane thickness also depends on the use of the glass pane as inner glass pane or outer glass pane. Preferably, glass panes with a standard thickness of 0.5 mm to 5 mm and preferably 1.0 mm to 2.5 mm are used. The dimensions of the glass panes can vary widely and depend on the use.

[0047] The carrier glass panes can have any three-dimensional shape. Preferably, the outer glass pane and the inner glass pane do not have any shadow areas, so that they can be coated, for example, by cathode sputtering. The outer glass pane and the inner glass pane are preferably flat or slightly or strongly curved in one or more directions in space.

[0048] 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 also contain, for example, polypropylene (PP), polyacrylates, polyethylene (PE), polycarbonate (PC), polymethyl methacrylate, polyvinyl chloride, polyvinyl acetate resins, casting resins, acrylates, fluorinated ethylene propylene, polyvinyl fluoride and / or ethylene tetrafluoroethylene, or copolymers or mixtures thereof.

[0049] The thermoplastic intermediate layer is preferably designed as at least one thermoplastic composite film and contains polyvinyl butyral (PVB), particularly preferably polyvinyl butyral (PVB) and additives known to those skilled in the art (such as plasticizers), or consists thereof. The thermoplastic intermediate layer preferably contains at least one plasticizer.

[0050] Plasticizers are chemical compounds that make plastics softer, more flexible, smoother and / or more elastic. They transfer the thermoelastic range of plastics to lower temperatures, so that plastics have the desired more elastic properties within the operating temperature range. Preferred plasticizers are carboxylic acid esters, particularly low volatility carboxylic acid esters, fats, oils, soft resins and camphor. Other plasticizers are preferably aliphatic diesters of triethylene glycol or tetraethylene glycol. Particularly preferred plasticizers are 3G7, 3G8 or 4G7, wherein the first digit represents the number of ethylene glycol units, and the last digit represents the number of carbon atoms in the carboxylic acid portion of the compound. 3G8 thus represents triethylene glycol bis (2-ethylhexanoate), i.e. a compound representing the formula C4H9CH(CH2CH3)CO(OCH2CH2)3O2CCH(CH2CH3)C4H9.

[0051] The thermoplastic interlayer based on PVB preferably contains at least 3% by weight, preferably at least 5% by weight, particularly preferably at least 20% by weight, even more preferably at least 30% by weight and in particular at least 35% by weight of plasticizer. The plasticizer contains or consists of, for example, triethylene glycol bis(2-ethylhexanoate).

[0052] The thermoplastic intermediate layer may be formed of a single film, or may be formed of more than one film. The thermoplastic intermediate layer may be formed of one or more superimposed thermoplastic films, wherein the thickness of the thermoplastic intermediate layer is preferably 0.25 mm to 1 mm, typically 0.38 mm or 0.76 mm.

[0053] The thermoplastic interlayer can also be a functional thermoplastic interlayer, in particular an interlayer with acoustic damping properties, an interlayer reflecting infrared radiation, an interlayer absorbing infrared radiation and / or an interlayer absorbing UV radiation. Thus, the thermoplastic interlayer can also be a bandpass filter film that blocks a narrow band of visible light, for example.

[0054] Furthermore, the present invention includes a method for manufacturing a carrier glass plate according to the present invention. The method includes at least the following steps:

[0055] a) providing a substrate having an outer surface (side I), an inner surface (side II) and a peripheral edge region (R),

[0056] b) Applying an opaque covering layer at least in sections to the outer surface (surface I) and / or the inner surface (surface II), said opaque covering layer comprising a layer based on titanium aluminum nitride at least in the edge region.

[0057] In this case, the titanium aluminum nitride-based layer is applied by physical or chemical vapor deposition.

[0058] In a preferred embodiment of the method, in step c) after step b), a sunscreen coating is applied over the opaque cover layer by physical vapor deposition. The sunscreen coating can preferably be heated, for which purpose an electrical conductor for applying a voltage is applied to the sunscreen coating.

[0059] In a preferred embodiment, after step b) or after step c), the substrate is laminated to a second glass pane with a thermoplastic interlayer therebetween to form a laminated glass pane.

[0060] The lamination of the layer stack is carried out under the action of heat, vacuum and / or pressure, wherein the individual layers are connected to each other (laminated) by at least one thermoplastic interlayer. A method known per se for manufacturing a laminated glass sheet can be used. For example, the so-called autoclave method can be carried out at an elevated pressure of about 10 bar to 15 bar and a temperature of 130°C to 145°C for about 2 hours. The vacuum bag or vacuum ring method known per se operates, for example, at about 200 mbar and 130°C to 145°C. The outer glass sheet, the inner glass sheet and the thermoplastic interlayer can also be pressed in a calender between at least one pair of rollers to form a laminated glass sheet. Systems of this type for manufacturing laminated glass sheets are known and typically have at least one heating channel upstream of the pressing unit. The temperature during the pressing process is, for example, 40°C to 150°C. The combination of a calender and an autoclave method has proven to be particularly successful in practice. A vacuum laminator can be used as an alternative. They consist of one or more heatable and evacuable chambers, in which outer and inner glass panes can be laminated at a reduced pressure of 0.01 mbar to 800 mbar and a temperature of 80° C. to 170° C. within, for example, about 60 minutes.

[0061] The methods for applying the opaque covering layer and the sunscreen coating have already been explained in the description of the layers themselves.

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

[0063] The vehicle glass pane according to the invention is preferably used as a roof pane, rear pane, side pane or windshield in a vehicle for land, air or water transportation, particularly preferably in a motor vehicle. In particular, as a windshield, the vehicle glass pane can be part of a projection device.

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

[0065] The invention will be explained in more detail below with reference to exemplary embodiments, wherein reference is made to the accompanying drawings. In the simplified, not to scale illustrations:

[0066] Figure 1a shows a plan view of a carrier glass sheet according to the invention,

[0067] Figure 1b Shows the cross section along section line AA' Figure 1a The cross section of the carrier glass plate,

[0068] Figure 2a A plan view showing another embodiment of a carrier glass pane according to the invention as a laminated glass pane,

[0069] Figure 2b Shown along the section line BB' through Figure 2a The cross section of the carrier glass plate,

[0070] Figure 3a -d shows various embodiments of the opaque cover layer according to the invention of a carrier glass pane.

[0071] Figure 1a and 1bA plan view of a carrier glass pane 10 according to the invention and a cross-sectional view of the carrier glass pane 10 along the section line AA' are shown. The carrier glass pane 10 comprises a substrate 1 having a peripheral edge region R, which is arranged in the vicinity of a peripheral edge K of the substrate 1. The substrate 1 has an outer side surface I which faces the environment in the main body in the installed state and an inner side surface II which faces the interior of the carrier in the installed state. In the peripheral edge region R, an opaque cover layer 5 is applied to the inner side surface II. Possible embodiments of the opaque cover layer 5 are described in Figure 3a -d.

[0072] Figure 2a and 2b An exemplary embodiment of a carrier glass pane 10 according to the invention as a windshield is shown in plan view and in cross-sectional view. Figure 2b The cross-section diagram corresponds to Figure 2a The cross-sectional line BB′ of the carrier glass plate 10 is shown in FIG.

[0073] The carrier glass panel 10 as a windshield is a laminated glass panel, which includes a substrate 1 as an outer glass panel and a second glass panel 2 as an inner glass panel, which are connected via a thermoplastic interlayer 3. The substrate 1 has an outer surface I and an inner surface II, and the second glass panel 2 has an outer surface III and an inner surface IV. The inner surface II of the substrate 1 is connected to the outer surface III of the second glass panel 2 via the thermoplastic interlayer 3 to form a laminated glass panel. The outer surface I of the substrate 1 faces away from the thermoplastic interlayer 3, and it is also the outer surface of the laminated glass panel. The inner surface II of the substrate 1 and the outer surface III of the second glass panel 2 each face the interlayer 3. The inner surface IV of the second glass panel 2 faces away from the thermoplastic interlayer 3, and is also the surface of the laminated glass panel 10 facing the interior of the carrier in the installed state. It should be understood that the laminated glass panel 10 can have any suitable geometry and / or curvature. As a laminated glass panel 10, it usually has a convex curvature.

[0074] The substrate 1 and the second glass sheet 2 each consist of glass, preferably thermally prestressed soda-lime glass, and are transparent to visible light. The thermoplastic interlayer 3 comprises a thermoplastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) and / or polyethylene terephthalate (PET).

[0075] The windshield has a peripheral edge K consisting of a motor edge M, a top edge D and two side edges S. The edge adjacent to the motor cover in the installed position of the windshield in the body is called the motor edge M. Located opposite the motor edge M is the top edge, which in the installed state is adjacent to the roof. The motor edge M and the top edge D are connected by two side edges S opposite to each other. Located circumferentially adjacent to the peripheral edge K is a peripheral edge region R, in which a peripheral opaque cover layer 5 in the shape of a frame is attached to the inner surface II of the substrate 1. The cover layer 5 is opaque and prevents observation of structures arranged on the inside of the carrier glass pane 10. The opaque cover layer 5 prevents observation through the laminated glass pane 10, as a result of which, for example, a strip of adhesive for bonding the laminated glass pane 10 to the body is not visible from the carrier environment. The width of the peripheral edge region R is variable along the peripheral edge K. Along the motor edge M, the edge region R with the opaque cover layer 5 located therein widens.

[0076] On the inner surface II of the substrate 1, a sunscreen coating 4 is applied evenly above an opaque cover layer 5. The opaque cover layer 5 and the sunscreen coating 4 are applied by physical vapor deposition. Possible embodiments of the opaque cover layer 5 are described in Figure 3a -d.

[0077] Figure 3a -d shows various embodiments of the invention of an opaque cover layer 5 attached to the inner surface II of the substrate 1. Figure 3a , the opaque cover layer 5 consists of a layer 5.1 based on titanium aluminum nitride. Figure 3b , the reflective layer 9 consists of an adhesion-promoting layer 5 . 2 and a layer 5 . 1 based on titanium aluminum nitride, which adhere to the inner surface II of the substrate 1 in this order. Figure 3c An opaque cover layer 5 consisting of a layer 5.1 based on titanium aluminum nitride and a protective layer 5.3 is shown, which is applied in this order to the inner surface II of the substrate 1. Figure 3d In another embodiment, the opaque cover layer 5 consists, starting from the inner surface II of the substrate 1 , of an adhesion-promoting layer 5 . 2 , a layer 5 . 1 based on titanium aluminum nitride and a protective layer 5 . 3 .

[0078] Reference numerals list

[0079] 10 Carrier Glass Plate

[0080] 1. Substrate

[0081] 2 Second Glass Plate

[0082] 3 Thermoplastic middle layer

[0083] 4 Sunscreen coating

[0084] 5 Opaque Overlay

[0085] 5.1 Titanium aluminum nitride based layers

[0086] 5.2 Adhesion promoting layer

[0087] 5.3 Protection layer

[0088] R Edge area

[0089] K Peripheral edge

[0090] M Engine Edge

[0091] D Top edge

[0092] S side edge

[0093] I The outer surface of the outer glass plate 1

[0094] II Inner surface of outer glass plate 1

[0095] III The outer surface of the inner glass plate 2

[0096] IV Inner surface of inner glass plate 2

[0097] A-A' Hatch Line

[0098] BB' hatch

Claims

1. A carrier glass plate (10) comprising at least a substrate (1) made of glass, the substrate (1) having an outer surface (I), an inner surface (II) and an edge region (R) arranged circumferentially directly adjacent to an outer peripheral edge (K) of the substrate (1), in The substrate (1) comprises an opaque covering layer (5) at least in sections in the edge region (R) on the outer surface (I) and / or the inner surface (II), and - The opaque cover layer (5) comprises at least one layer (5.1) based on titanium aluminum nitride.

2. The carrier glass pane (10) according to claim 1, wherein the layer (5.1) based on titanium aluminum nitride contains at least 90% by weight of titanium aluminum nitride, preferably at least 95% by weight of titanium aluminum nitride, and particularly preferably at least 99% by weight of titanium aluminum nitride.

3. The carrier glass pane (10) according to claim 1 or 2, 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.

4. The carrier glass pane (10) according to claim 1, 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.

5. The carrier glass pane (10) according to claim 1 , wherein the opaque cover layer (5) comprises an adhesion-promoting layer (5.2) which is directly attached 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.

6. The carrier glass pane (10) according to claim 1, wherein the opaque cover layer (5) comprises a protective layer (5.3) applied to the titanium aluminum nitride-based layer (5.1) on its surface facing away from the substrate (1).

7. The carrier glass plate (10) according to any one of claims 1 to 6, wherein the opaque cover layer (5) has at least 10 -8 S / cm, preferably at least 10 -7 The conductivity is S / cm.

8. The carrier glass sheet (10) according to any one of claims 1 to 7, comprising at least a second glass sheet (2) having an outer surface (III) and an inner surface (IV) and a thermoplastic interlayer (3), wherein the thermoplastic interlayer (3) connects the inner surface (II) of the substrate (1) and the outer surface (III) of the second glass sheet (2) or the inner surface (IV) of the second glass sheet (2) and the outer surface (I) of the substrate (1) to each other to form a laminated glass sheet.

9. The carrier glass pane (10) according to claim 8, wherein the substrate (1) forms an outer glass pane of the laminated glass pane and an opaque cover layer (5) is arranged on the inner surface (II) of the substrate (1).

10. The carrier glass pane (10) according to claim 9, wherein a sun protection coating (4) is applied on the inner surface (II) of the cover layer (5), said sun protection coating (4) being preferably heated and comprising bus bars (6) in the edge region (R).

11. The carrier glass pane (10) according to claim 8, wherein the substrate (1) forms the inner glass pane of the laminated glass pane, and the opaque cover layer (5) is arranged on the outer surface (I) of the substrate (1) and / or on the inner surface (II) of the substrate (1), preferably on the outer surface (I) of the substrate (1).

12. A method for manufacturing a carrier glass plate (10) according to any one of claims 1 to 11, wherein: a) providing a substrate (1) having an outer surface (I), an inner surface (II) and a peripheral edge region (R), b) applying an opaque covering layer (5) at least in sections to the outer surface (I) and / or the inner surface (II), said opaque covering layer (5) comprising a layer (5.1) based on titanium aluminum nitride at least in the edge region (R), The titanium aluminum nitride-based layer ( 5 . 1 ) is applied by physical or chemical vapor deposition.

13. The method according to claim 12, wherein the sun protection coating (4) is applied to the substrate (1) by physical vapor deposition over the opaque cover layer (5).

14. A method according to claim 12 or 13, wherein after step b), the substrate (1) is laminated to a second glass pane (2) with a thermoplastic interlayer (3) therebetween to form a laminated glass pane.

15. Use of the vehicle glass pane according to any one of claims 1 to 11 as a roof glass pane, a rear glass pane, a side glass pane, a windshield of a vehicle or as a windshield for a projection device.

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