Coated pane suitable for automotive glazing

Abstract

The invention relates to a coated pane, in particular a coated pane suitable for automotive glazing, comprising a coating sequence comprising a multi-layer top coating in direct contact with a silver-based functional layer, the multi-layer top coating comprising a first top layer and a second top layer, a first upper layer in direct contact with the silver-based functional layer and comprising an oxide of zinc; and the second upper layer is in direct contact with the first upper layer and comprises an oxide of zinc and tin, to a method for manufacturing said coated glass sheet, to a laminated glazing comprising said coated glass sheet, and to a method for manufacturing said laminated glazing.

Description

[0001] The present invention relates to a coated glass sheet, in particular a coated glass sheet suitable for automotive window glass. The present invention also relates to a method for manufacturing the coated glass sheet, a laminated window glass comprising the coated glass sheet, and a method for manufacturing the laminated window glass.

[0002] The glass manufacturing industry has a continuous demand for coated glass substrates that can meet the demanding performance requirements of automotive window glass. Such window glass must comply with the required safety standards, be shaped to meet the physical and aesthetic requirements of the structures in which they are placed, and fulfill their primary function of light transmission. It is also desirable for such window glass to have a pleasing color in terms of transmission and / or reflection.

[0003] In addition, a vehicle window glass may comprise a heating coating for reducing condensation on the interior of the window glass and / or defrosting ice on the exterior of the window glass. Such a heating coating may comprise a transparent conductive layer.

[0004] A glass coating comprising a transparent conductive layer may consist of, for example, the following repeating sequence:

[0005] ‘substrate / dielectric layer sequence / [silver (Ag) layer / dielectric layer sequence] n ’

[0006] wherein each layer does not have to have the same thickness or composition as another layer. It has become more common in the glass manufacturing industry for the above sequence to have an ‘n’ equal to 2, 3, 4 or even more than 5, thus allowing the production of a coating comprising 2, 3, 4 or even more than 5 silver layers. Such a coating can be deposited by, for example, a physical vapor deposition process such as sputtering.

[0007] With the increasing electrification of vehicles, there is still a need to provide window glass with a heating coating that is suitable for hybrid or electric vehicles. Hybrid or electric vehicles can supply power to the heating coating in a low voltage range such as 12 or 14V, a medium voltage such as 48V, or even a high voltage of more than 100V. It is desirable to provide a heating coating that can operate effectively within a certain voltage range, particularly in a low voltage range.

[0008] In addition, in order to provide window glass that meets the required safety standards, the glass sheet is typically subjected to thermal strengthening, wherein the glass sheet is heated to a temperature close to or above the glass softening point and then rapidly cooled to impart stress in the glass sheet. The glass sheet can be strengthened to provide different degrees of stress and thus higher or lower strength as required.

[0009] Similarly, in order to provide window glass that conforms to the required shape, the glass sheet is typically subjected to thermal bending, wherein the glass sheet is heated to a temperature close to or above the glass softening point and then bent by means of a suitable bending device.

[0010] In some cases, a simultaneous bending and strengthening process can be used. This process of using heat to change the shape and / or properties of a glass sheet is called "heat treatment".

[0011] Many window glasses comprise soda-lime-silica glass, which is typically produced using the float process. Strengthening or bending of a standard float soda-lime-silica glass is usually achieved by heating the glass to a temperature of about 580 - 690 °C, during which the glass sheet is held within this temperature range for a few minutes before the actual tempering and / or bending process is started.

[0012] Thus, in the following specification and claims, the term "heat treatment" refers to a thermal process such as bending and / or thermal strengthening, during which the coated glass sheet reaches a temperature in the range of 580 - 690 °C for at least 5 minutes. A glass sheet that has undergone such treatment is called "heat-treated".

[0013] It is also possible to subject the coated glass sheet to a strengthening and bending process. However, the coated glass sheet is usually incompatible with heat treatment and may be damaged by this process. Typical damage to the coated glass sheet caused by heat treatment can be indicated by increased haze (usually perceived as cloudiness), pinholes, and spots. The functionality of the window glass may also be impaired, resulting in a reduced light transmittance and / or a reduced effectiveness of the low-emissivity coating, such as an increase in sheet resistance value. Thus, a coated glass sheet damaged by heat treatment may be unacceptable due to its appearance and / or its reduced functionality. A coated glass sheet that exhibits such damage during heat treatment is called "non-heat-treatable". In contrast, if the coated glass sheet survives heat treatment without significant damage, it is considered "heat-treatable". A coated glass sheet that shows damage upon heating may be "hazy", which reduces the clarity of the view through the window glass reaching the observer. It is particularly desirable to provide a low-haze window glass for use as a vehicle windshield, since high haze may interfere with the driver's vision, thereby increasing the risk of accidents.

[0014] Therefore, it is desirable to produce "heat-treatable" coated glass sheets.

[0015] The object of the present invention is to provide a heat-treatable, in particular bendable, coated glass sheet suitable for laminating to provide a vehicle windshield, which has a sufficiently high light transmittance to provide a light transmittance of more than 70% in the laminated vehicle windshield, while also providing a resistivity such that the heating power per square meter in the laminated windshield is sufficiently high to provide effective defogging performance, and which also has a reduced haze to improve the view through the window glass.

[0016] According to a first aspect of the present invention, there is provided a coated glass sheet suitable for automotive window glass, which comprises a glass substrate and a coating sequence, wherein the coating sequence comprises, in order starting from the glass substrate:

[0017] A base layer in direct contact with the glass substrate;

[0018] A first subjacent coating;

[0019] A first silver-based functional layer in direct contact with the first subjacent coating;

[0020] A first superjacent coating in direct contact with the first silver-based functional layer;

[0021] A first intermediate dielectric coating;

[0022] A second subjacent coating;

[0023] A second silver-based functional layer in direct contact with the second subjacent coating;

[0024] A second superjacent coating in direct contact with the second silver-based functional layer; and

[0025] An upper dielectric coating, wherein:

[0026] The coating sequence includes multiple superjacent coatings in direct contact with the silver-based functional layer;

[0027] The multiple superjacent coatings include a first superjacent layer and a second superjacent layer;

[0028] The first superjacent layer is in direct contact with the silver-based functional layer and contains an oxide of zinc; and

[0029] The second superjacent layer is in direct contact with the first superjacent layer and contains oxides of zinc and tin.

[0030] The inventors have recognized that low-voltage power supplies, such as 12 or 14 V, require low-resistivity heating coatings to meet heating performance requirements, such as heating power per square meter (W / m 2 ). The present invention provides a heat-treatable, particularly bendable coated glass sheet, which is suitable for laminating to provide a vehicle windshield with a light transmittance higher than 70% and defogging performance while improving haze. In particular, a low-haze, low-resistivity coated glass sheet is provided, which has a sheet resistance in the range of 0.5 to less than 1.3 ohms per square.

[0031] Silver-based functional layer

[0032] The coating sequence includes at least a first silver-based functional layer and a second silver-based functional layer. However, other silver-based functional layers with associated subjacent coatings, superjacent coatings, and intermediate coatings are not excluded. Such additional silver-based functional layers can improve the conductivity of the coating.

[0033] Thus, in some embodiments, the coated glass sheet further comprises, between the second overcoat and the upper dielectric coating:

[0034] a second intermediate dielectric coating;

[0035] a third undercoat;

[0036] a third silver-based functional layer in direct contact with the third undercoat; and

[0037] a third overcoat in direct contact with the third silver-based functional layer.

[0038] In some embodiments, the coated glass sheet further comprises, between the third overcoat and the upper dielectric coating:

[0039] a third intermediate dielectric coating;

[0040] a fourth undercoat;

[0041] a fourth silver-based functional layer in direct contact with the fourth undercoat; and

[0042] a fourth overcoat in direct contact with the fourth silver-based functional layer.

[0043] A glass sheet comprising a coating sequence with a higher number of silver layers can increase the infrared reflection ability of the glass sheet. Those skilled in the art will understand upon reviewing this specification that further sequences can be inserted to increase the number of silver-based functional layers, for example, 5 or even more silver-based functional layers can be considered.

[0044] (One or more) silver-based functional layers preferably consist essentially of silver without any additives, as is usually the case in the field of low-emissivity and / or solar control coatings. However, within the scope of the present invention, the performance of (one or more) silver-based functional layers can be altered by adding dopants, alloying additives, etc. or even adding very thin layers of metals or metal compounds, provided that the performance of (one or more) silver-based functional layers required to act as (one or more) IR reflection layers with high light transmittance and low light absorption is not significantly impaired thereby.

[0045] The thickness of each silver-based functional layer is governed by its technical purpose. For typical low-emissivity and / or solar control purposes, the preferred layer thickness of the silver-based functional layer can preferably be: 1 to 30 nm; more preferably 5 to 20 nm; even more preferably 8 to 18 nm; even more preferably 10 to 16 nm. With such layer thicknesses, a light transmittance value above 70% and a normal emissivity below 0.05 can be easily achieved after heat treatment. Preferably, the first silver-based functional layer has a thickness of 3 nm to 20 nm, preferably, each silver-based functional layer has a thickness of 3 nm to 20 nm, more preferably, each silver-based functional layer has a thickness of 5 nm to 18 nm.

[0046] Preferably, the coating sequence does not include a nickel- and chromium-containing layer adjacent to the silver-based functional layer, and more preferably, the coating sequence does not include a nickel- and chromium-containing layer.

[0047] A lower voltage source requires a coating with lower resistance to obtain the same heating power. The heating power can be in the range of 200 W / m 2 to 1000 W / m 2 For "defrosting" products, a high heating power within this range is preferred, while for "demisting" products, a lower heating power within this range is preferred. Preferably, for demisting products, the heating power is between 300 and 600 W / m 2 For a 14 V power supply, this corresponds to a sheet resistance from 0.5 ohm / square to less than 1.3 ohm / square.

[0048] The sheet resistance (Rs) depends on the number and thickness of the silver layers in the coating. The greater the number of silver layers or the greater the thickness will contribute to a lower measured sheet resistance. Preferably, the sheet resistance RS is less than 1.3 Ω / □.

[0049] Overcoat

[0050] The coating sequence includes multiple overcoats, which include a first overcoat and a second overcoat. Such overcoats are preferably provided to protect the silver-based functional layer during the deposition of subsequent layers and to prevent damage to the silver-based functional layer during the heat treatment. At least a portion of the overcoat in direct contact with the silver-based functional layer is preferably deposited using non-reactive sputtering to avoid silver damage. It has been found that excellent protection of the silver-based functional layer during the deposition process and high optical stability during the heat treatment can be achieved if the layer includes a mixed metal oxide layer sputtered from a mixed metal oxide target.

[0051] Preferably, the first overcoat has a thickness of 0.5 to 10 nm, preferably 0.5 to 5 nm, more preferably 0.5 to 3 nm, and most preferably 0.5 to 2 nm.

[0052] Preferably, the second overcoat has a thickness of 0.5 to 20 nm, preferably 0.5 to 10 nm, more preferably 0.5 to 5 nm, more preferably 0.5 to 3 nm, and most preferably 0.5 to 2 nm.

[0053] In some embodiments, the first overcoat has a thickness of 0.5 - 3 nm and the second overcoat has a thickness of 0.5 - 3 nm. Such thicknesses provide excellent barrier properties and thus reduce the haze caused by the heat treatment step.

[0054] The coating sequence includes at least one multi-layer overcoat. However, other multi-layer overcoats are not excluded.

[0055] Thus, in some embodiments, each overcoat in direct contact with the silver-based functional layer comprises a multi-layer overcoat in direct contact with the silver-based functional layer;

[0056] Each multi-layer overcoat comprises a first overcoat layer and a second overcoat layer;

[0057] Each first overcoat layer is in direct contact with the silver-based functional layer and comprises an oxide of zinc; and

[0058] Each second overcoat layer comprises oxides of zinc and tin.

[0059] Preferably, each first overcoat layer has a thickness of 0.5 to 10 nm, preferably 0.5 to 5 nm, more preferably 0.5 to 3 nm, and most preferably 0.5 to 2 nm.

[0060] Preferably, the first overcoat layer based on zinc oxide comprises a mixed metal oxide, such as ZnO:Al. In particular, good results can be achieved if the ZnO:Al-based layer is sputtered from a conductive ZnO:Al target. ZnO:Al can be deposited in its fully oxidized form or in its slightly sub-oxidized form.

[0061] The second overcoat layer comprises oxides of zinc and tin. The second overcoat layer comprising oxides of zinc and tin preferably comprises (by weight of the total metal content of the layer): 10 to 90 wt% zinc and 90 to 10 wt% tin; more preferably 40 to 60 wt% zinc and 40 to 60 wt% tin; even more preferably approximately 50 wt% each of zinc and tin. In some preferred embodiments, the layer comprising oxides of zinc and tin comprises at most 18 wt% tin, more preferably at most 15 wt% tin, and even more preferably at most 10 wt% tin. The layer comprising oxides of zinc and tin is preferably deposited by reactive sputtering of a mixed ZnSn target in the presence of O2.

[0062] In some embodiments, each second overcoat layer has a thickness of 0.5 to 15 nm, preferably 0.5 to 10 nm, more preferably 0.5 to 5 nm, and even more preferably 0.5 to 2 nm. Alternatively, each second overcoat layer between two silver-based functional layers has a thickness of 0.5 - 10 nm, preferably 0.5 - 5 nm, more preferably 0.5 - 3 nm, and most preferably 0.5 - 2 nm, and the uppermost overcoat layer has a thickness of 10 - 15 nm. This arrangement allows for a more robust coated window glass. Alternatively, each second overcoat layer has a thickness of 10 - 15 nm.

[0063] The multi-layer overcoat preferably has a thickness of less than or equal to 10 nm.

[0064] Base coat

[0065] The coated glass sheet of the present invention comprises a base coating which comprises a base layer in contact with the glass substrate.

[0066] Preferably, the base layer comprises an oxide of zirconium and / or titanium or a nitride and / or oxide of silicon, preferably, wherein the base layer comprises an oxide of zirconium and / or titanium or a nitride and / or oxide of silicon, having a thickness of 5 to 100 nm, preferably 10 to 50 nm, more preferably 20 to 40 nm. Such a thickness of this base layer allows the production of a coated glass sheet that is particularly resistant to heat treatment damage, while also providing improved impact and optical properties.

[0067] In the case where the base layer comprises a nitride of silicon, preferably, the nitride of silicon is doped with aluminum. The doping with aluminum is preferably between 5 and 15% by weight, more preferably between 8 and 10% by weight. Such a base layer allows the production of a coated glass sheet that is particularly resistant to heat treatment damage.

[0068] Preferably, the base layer comprising an oxide of zirconium and titanium comprises Zr x Ti y O z , and the atomic ratio of Zr atoms based on Zr and Ti in the base layer, calculated as x / (x + y), is 0.40 - 0.95.

[0069] As used herein, the atomic ratio of zirconium (Zr) based on zirconium and titanium (Ti), calculated as x / (x + y), is calculated by dividing the atomic percentage of zirconium in the total composition by the sum of the atomic percentages of zirconium and titanium in the total composition. For example, a layer having atomic percentages Zr(20), Ti(20), O(60) has a Zr atomic ratio of 0.5. Preferably, the atomic ratio of Zr atoms based on Zr and Ti in the base layer, calculated as x / (x + y), is 0.50 - 0.90. Preferably, the atomic ratio of Zr atoms based on Zr and Ti in the base layer, calculated as x / (x + y), is 0.55 - 0.85. More preferably, the atomic ratio of Zr based on Zr and Ti in the base layer, calculated as x / (x + y), is 0.60 - 0.80. More preferably, the atomic ratio of Zr atoms based on Zr and Ti in the base layer, calculated as x / (x + y), is 0.62 - 0.67. A coated glass sheet comprising a base layer having such a Zr atomic ratio has particularly good heat treatment properties.

[0070] Preferably, calculated as Ti in the total composition, the atomic % of titanium in the base layer is 1 to 25, preferably 5 to 20, more preferably 8 to 15.

[0071] Preferably, calculated as O in the total composition, the atomic % of oxygen in the base layer is 60 - 70, preferably 62 - 66, more preferably 63 - 65.

[0072] Preferably, calculated as Zr in the total composition, the atomic % of zirconium in the base layer is 12 - 35, preferably 15 - 25.

[0073] The base coating may include other layers between the base layer and the first undercoat. For example, the base coating may include a layer containing oxides of zinc and tin between the base coating and the first undercoat. Such a layer containing oxides of zinc and tin in the base coating can improve the optical properties and the stability to heat treatment of the coated glass sheet.

[0074] When the base coating includes a layer containing oxides of zinc and tin, the layer containing oxides of zinc and tin preferably contains (by weight % of the total metal content of the layer): 10 to 90% by weight of zinc and 90 to 10% by weight of tin; more preferably 40 to 60% by weight of zinc and 40 to 60% by weight of tin; even more preferably about 50% by weight each of zinc and tin. In some preferred embodiments, the layer containing oxides of zinc and tin contains at most 18% by weight of tin, more preferably at most 15% by weight of tin, even more preferably at most 10% by weight of tin. The layer containing oxides of zinc and tin is preferably deposited by reactive sputtering of a mixed ZnSn target in the presence of O2.

[0075] The layer containing oxides of zinc and tin preferably has a thickness of at least 10 nm. More preferably, the layer containing oxides of zinc and tin has a thickness of 10 nm to 20 nm. Even more preferably, the layer containing oxides of zinc and tin has a thickness of 12 nm to 16 nm. Most preferably, the layer containing oxides of zinc and tin has a thickness of 12 nm to 14 nm.

[0076] Undercoat

[0077] The coating sequence includes an adjacent undercoat and a lower silver-based functional layer. The undercoat does not include the underlying base coating or intermediate coating. It is desired that the undercoat provides a well-oriented crystal structure for the subsequent growth of the silver-based functional layer, thereby improving its conductivity.

[0078] Any or all of the undercoats may preferably have a thickness of at least 2 nm. More preferably, any or all of the undercoats may preferably have a thickness of 2 to 20 nm; or 3 to 12 nm. Even more preferably, any or all of the undercoats may preferably have a thickness of 12 to 18 nm. Most preferably, any or all of the undercoats have a thickness of 15 - 17 nm.

[0079] Preferably, the first undercoat includes a layer containing zinc oxide in direct contact with the overlying silver-based functional layer, and preferably, each undercoat includes a layer containing zinc oxide in direct contact with the overlying silver-based functional layer.

[0080] Preferably, the first underlying coating and / or the second underlying coating and / or the third underlying coating and / or the fourth underlying coating, when present, comprise a layer containing zinc oxide, preferably zinc oxide doped with aluminum. Such a layer allows for the deposition of a silver-based functional layer with improved conductivity. Among them, the underlying coating containing a layer of zinc oxide doped with aluminum has a doping of up to about 10% by weight. The typical content of aluminum is about 2% by weight.

[0081] The layer of zinc oxide of the underlying coating directly adjacent to the silver-based functional layer is preferably deposited by reactive sputtering from a zinc target in an oxygen (O2)-containing atmosphere or by sputtering from a ceramic target (e.g., based on zinc oxide and optionally doped with aluminum) in an atmosphere containing zero or only a small amount (i.e., generally not exceeding about 5% by volume) of oxygen.

[0082] Intermediate dielectric coating

[0083] The coated glass plate according to the present invention comprises a first intermediate dielectric coating and may comprise additional intermediate dielectric coatings.

[0084] Preferably, such an intermediate dielectric coating comprises a layer containing zinc oxide with a thickness greater than 10 nm, preferably a layer of zinc oxide doped with aluminum with a thickness greater than 10 nm. Preferably, the layer containing zinc oxide doped with aluminum contains 1% to 15% aluminum by weight.

[0085] In some cases, the intermediate dielectric layer may comprise a layer of an oxide of zirconium and titanium, Zr x Ti y O z In some embodiments, the layer of the oxide of zirconium and titanium, Zr x Ti y O z of the intermediate dielectric layer may contain zirconium with an atomic ratio of 0.40 to 0.95, based on Zr and Ti, calculated as x / (x + y).

[0086] Preferably, the intermediate dielectric coating comprises a first intermediate layer containing zinc oxide and a second intermediate layer containing a nitride of silicon and / or aluminum. Preferably, each intermediate dielectric coating comprises a first intermediate layer containing zinc oxide and a second intermediate layer containing a nitride of silicon and / or aluminum.

[0087] Preferably, the first intermediate layer containing zinc oxide has a thickness of 10 to 20 nm. Preferably, each first intermediate layer containing zinc oxide has a thickness of 10 to 20 nm.

[0088] Preferably, the second intermediate layer containing a nitride of silicon and / or aluminum has a thickness of 30 to 60 nm. Preferably, each second intermediate layer containing a nitride of silicon and / or aluminum has a thickness of 30 to 60 nm.

[0089] Upper dielectric coating

[0090] The coating sequence comprises an upper dielectric coating. The upper dielectric coating does not comprise an overlying layer thereunder.

[0091] Preferably, the upper dielectric coating sequentially comprises, starting from the glass substrate, a layer containing a nitride of silicon and / or aluminum, and an outermost layer.

[0092] The layer containing oxides of zinc and tin in the upper dielectric coating may preferably have a thickness of 0.5 to 20 nm, more preferably 1 to 10 nm, and even more preferably 1.5 to 3 nm. These preferred thicknesses enable further easy deposition and improvement of optical properties such as haze, while maintaining mechanical durability.

[0093] The layer in the upper dielectric coating based on aluminum (oxy)nitride or silicon (oxy)nitride may preferably include at least 5 nm; preferably a thickness of 20 to 40 nm. Such a thickness provides a further improvement in the mechanical robustness of the coated glass sheet. The layer based on aluminum (oxy)nitride, silicon (oxy)nitride may preferably be in direct contact with the layer containing zinc (Zn) oxide in the upper dielectric layer.

[0094] The layer based on aluminum (oxy)nitride and / or silicon (oxy)nitride may comprise a major part of the upper dielectric coating, and provide stability (better protection during heat treatment) and diffusion barrier properties. The layer is preferably deposited as an Al nitride and / or Si nitride layer by reactive sputtering of a Si, Al or mixed SiAl target, such as a Si 90 Al 10 target in an N2-containing atmosphere. The composition of the layer based on aluminum (oxy)nitride and / or silicon (oxy)nitride may be substantially stoichiometric Si 90 Al 10 N x .

[0095] Preferably, the oxide layer in the upper dielectric coating is based on a substantially stoichiometric metal oxide. Using a layer based on a substantially stoichiometric metal oxide instead of a metal or a layer less than 95% stoichiometric results in extremely high optical stability of the coating during heat treatment, and effectively helps to maintain small optical modifications during the heat treatment process. Additionally, using a layer based on a substantially stoichiometric metal oxide provides a benefit in terms of mechanical robustness.

[0096] In some cases, the upper dielectric coating may comprise a layer containing oxides of zirconium and titanium Zr x Ti y O z In some embodiments, the upper dielectric layer containing oxides of zirconium and titanium Zr x Ti y O zThe layer may contain Zr in an atomic ratio of 0.40 to 0.95, based on Zr and Ti, calculated as x / (x + y).

[0097] Preferably, the upper dielectric coating comprises an outermost layer that contains oxides of zirconium, oxides of silicon and / or aluminum, oxides of zinc and tin, or nitrides of silicon and / or aluminum. When incorporated into a laminated window glass, these layers can improve the impact performance of the coated glass sheet.

[0098] The outermost layer is preferably a protective layer, which is the outermost layer of the coating, for increasing mechanical and / or chemical robustness, such as scratch resistance. In some embodiments, the outermost layer comprises a layer based on oxides of zinc and tin. In addition to zinc and tin, the protective layer may also contain zirconium. Preferably, the outermost layer based on oxides of zinc, tin, and zirconium contains 12 to 35 atomic % of zirconium. More preferably, the outermost layer based on oxides of zinc, tin, and zirconium contains 15 to 33 atomic % of zirconium. Most preferably, the outermost layer based on oxides of zinc, tin, and zirconium contains 18 to 33 atomic % of zirconium.

[0099] Preferably, the heat-treatable coated glass sheet provides a haze scan value of less than 90, more preferably less than 60, still more preferably less than 50, when heat-treated to a heat-treated coated glass sheet.

[0100] In some embodiments, the heat-treated coated glass sheet shows a haze scan value of less than 90. A haze scan value of less than 80 is preferably desired, and even more preferably less than 70. In some applications, where clarity is a priority, a haze scan value of less than 60, preferably less than 50, is desired.

[0101] Preferably, the substrate is a soda-lime-silica glass sheet. The soda-lime-silica glass sheet is particularly suitable for bending operations. Preferably, the substrate is a soda-lime-silica glass sheet with a thickness less than or equal to 3.5 mm. More preferably, the substrate is a soda-lime-silica glass sheet with a thickness less than or equal to 2.5 mm. This thickness of the soda-lime-silica glass sheet is particularly suitable for bending and / or laminating operations.

[0102] In some embodiments, the coated glass sheet is a heat-treated coated glass sheet. Preferably, the heat-treated coated glass sheet is a heat-bent coated glass sheet or a heat-strengthened coated glass sheet.

[0103] The coated glass sheet that has undergone heat bending includes a radius of curvature in at least one direction. Preferably, the coated glass sheet that has undergone heat bending includes a radius of curvature of 500 mm to 20,000 mm in at least one direction. More preferably, the coated glass sheet that has undergone heat bending includes a radius of curvature of 1000 mm to 8000 mm in at least one direction.

[0104] A coated glass sheet that has undergone heat tempering preferably has at least twice the strength of annealed glass of a similar thickness. A coated glass sheet that has undergone heat tempering preferably has at least four times the strength of annealed glass of a similar thickness. Preferably, the heat-strengthened heat-treated coated glass sheet includes a compressive stress on the surface of 400 to 1500 kg / m 2 In the case where the heat-strengthened heat-treated coated glass sheet comprises a toughened glass sheet, preferably, the coated glass sheet includes a compressive stress on the surface of 750 to 1500 kg / m 2 Alternatively, the heat-strengthened heat-treated coated glass sheet may include a compressive stress on the surface of 400 to 700 kg / m 2 of compressive stress, and such a sheet is referred to in the art as a "heat strengthened" rather than a "toughened" sheet.

[0105] Glass sheets that have undergone heat strengthening are controlled by standards such as EN 12600, BS 6206:1981 and other standards. Preferably, the heat-strengthened coated glass sheet meets Class 1 to EN 12600. Preferably, the heat-tempered coated glass sheet meets Class 1 to EN 12600 in the mode of fracture type C. More preferably, the heat-tempered coated glass sheet meets Class 1 (C) 1 to EN 12600. Preferably, the heat-tempered coated glass sheet complies with Class C of BS 6206:1981, more preferably Class B, and still more preferably Class A.

[0106] According to EN356, window glass can be classified according to its resistance to artificial attack. Preferably, the heat-tempered coated glass sheet complies with at least P1A and / or P6B according to EN356.

[0107] Preferably, the glass sheet that has undergone heat tempering has been subjected to homogenizing heat treatment.

[0108] It should be understood that the coating sequence according to the present invention may include additional coating layers, and any additional layer may contain additives that change its properties and / or facilitate its manufacture, for example, reaction products of dopants or reactive sputtering gases. In the case of an oxide-based layer, nitrogen can be added to the sputtering atmosphere, resulting in the formation of nitrogen oxides instead of oxides, and in the case of a nitride-based layer, oxygen can be added to the sputtering atmosphere, also resulting in the formation of nitrogen oxides instead of nitrides.

[0109] When adding any such additional partial layer to the basic layer sequence of the glass sheet of the present invention, care must be taken to make appropriate material, structure and thickness selections so that properties mainly targeted at, for example, high thermal stability are not significantly impaired thereby.

[0110] In addition, in the context of the present invention, when a layer is said to be "based on" one or more specific materials, this means that the layer predominantly comprises at least 50 atomic % of said one or more materials, i.e., a layer based on ZnO x :Al should have a total atomic percentage of Zn, O and Al greater than 50%, unless otherwise stated.

[0111] When a layer is based on ZnSnO x then "ZnSnO x " refers to the oxides of Zn and Sn as described and defined elsewhere in the specification. Preferably, the oxides of zinc and tin have a metal Zn:Sn weight ratio of 1:1. Alternatively, the oxides of zinc and tin can comprise a metal Zn:Sn weight ratio of 0.1:1 to 1:0.1.

[0112] In some embodiments, the coating sequence is removed around the perimeter of the coated glass sheet. This "edge removal" results in no coating around the perimeter of the coated glass sheet to prevent articles adjacent to the coated glass sheet from becoming charged when the coating sequence is charged. This edge removal can be achieved, for example, by grinding, laser, etching and / or masking the sheet prior to the coating step.

[0113] According to a second aspect of the present invention, there is provided a method of manufacturing a coated glass sheet according to the first aspect, comprising the steps of:

[0114] i) providing a glass substrate; and

[0115] ii) sequentially coating the glass substrate with the coating by sputtering.

[0116] Preferably, after step ii), the method further comprises the steps of:

[0117] iii) heat treating the glass substrate,

[0118] Preferably, wherein heat treating the glass substrate includes bending or tempering.

[0119] Regarding the second aspect of the present invention, it should be understood that all features of the first aspect of the present invention, such as the glass substrate, the base layer, the upper dielectric layer and the silver-based functional layer, can also be applied to the second aspect in any combination.

[0120] The present invention is not limited to the specific production methods of the coatings. However, it is particularly preferred that at least one layer, most preferably all layers, are applied by magnetron cathodic sputtering, whether in DC mode, pulsed mode, medium frequency mode or any other suitable mode, thereby sputtering metal or ceramic targets reactively or non-reactively in a suitable sputtering atmosphere. Depending on the material to be sputtered, planar or rotating tubular targets can be used.

[0121] Preferably, the base coating, and / or the silver-based functional layer, and / or the upper dielectric coating, and / or the intermediate dielectric coating are provided by physical vapor deposition.

[0122] In the context of the present invention, the term "non-reactive sputtering" includes sputtering an oxide target in a low oxygen atmosphere (i.e., having zero or at most 10% by volume of oxygen) to provide a substantially stoichiometric oxide.

[0123] In some embodiments, the base layer is prepared by reactive sputtering from a TiZr metal target in an Ar / O2 atmosphere. Alternatively, the base layer is prepared by co-sputtering a titanium metal target and a zirconium metal target in an Ar / O2 atmosphere. Alternatively, the base layer is produced by sputtering from a Ti x Zr y O x ceramic target in an atmosphere having less than 10% oxygen.

[0124] Layers based on oxides of Zn, Ti, ZnSn, InSn, Zr, Al, Sn and / or Si and / or (oxy)nitrides of Si and / or Al can be deposited by non-reactive sputtering. The layers can be sputtered from a ceramic target.

[0125] Layers based on oxides of Zn, Ti, ZnSn, InSn, Zr, Al, Sn and / or Si and / or (oxy)nitrides of Si and / or Al can also be deposited by reactive sputtering. The layers can be sputtered from one or more metal targets.

[0126] The layer can be provided to its total final thickness in a single coating pass. Alternatively, multiple coating passes can be used, which employ the same coating chemistry to provide a single layer of the final thickness. As used herein, sub-layers of substantially the same composition provided by multiple passes are considered together as a single layer having a thickness equal to the sum of the sub-layer thicknesses.

[0127] To minimize any light absorption in the coating and to reduce the increase in light transmittance during heat treatment (which is undesirable), preferably, all individual layers of the upper and lower dielectric coatings are deposited with a substantially stoichiometric composition. In particular, it is preferred to carry out the coating process by setting appropriate coating conditions such that any oxygen (or nitrogen) deficiency in any oxide (or nitride) layer of the coating remains low to achieve high stability of the light transmittance and color of the coated glass sheet during heat treatment.

[0128] The light transmittance values referred to in this specification are generally specified with reference to a coated glass sheet comprising a 4 mm thick standard float glass sheet, which has a light transmittance TL of about 90% in the absence of a coating.

[0129] According to a third aspect of the present invention, there is provided a laminated window glass, preferably a windshield, comprising a coated glass sheet according to the first aspect of the present invention, a further glass sheet, and an intermediate layer between the coated glass sheet and the further glass sheet.

[0130] Preferably, the thicknesses of both the substrate and the further glass sheet are less than 2.5 mm, preferably less than or equal to 2.1 mm, and the intermediate layer comprises a polyvinyl butyral (PVB) sheet.

[0131] According to a fourth aspect of the present invention, there is provided a method of manufacturing a laminated window glass according to the third aspect of the present invention, comprising the steps of:

[0132] i) providing an apparatus comprising a coated glass sheet according to the first aspect of the present invention, a further glass sheet, and an intermediate layer between the coated glass sheet and the further glass sheet; and

[0133] ii) subjecting the apparatus to a lamination process, preferably in an autoclave.

[0134] According to a fifth aspect of the present invention, there is provided a vehicle window glass comprising a laminated window glass according to the third aspect of the present invention.

[0135] Preferably, the vehicle window glass further comprises a bus bar and / or a connector for supplying electrical energy to the coating sequence. Such connectors and bus bars are known to those skilled in the art. The connector can be preferably soldered to the bus bar with lead-free solder.

[0136] The optional or advantageous features of the first aspect of the present invention can be combined with the second, third, fourth, and fifth aspects of the present invention in any combination.

[0137] The embodiments of the present invention will now be described by way of non-limiting examples and with reference to Figures 1 to 2 the embodiments of the present invention described herein.

[0138] Figure 1 A schematic cross-sectional view of a coated glass sheet according to a first embodiment of the present invention is shown.

[0139] Figure 2 A schematic cross-sectional view of a laminated window glass according to the third aspect (with a coated glass sheet according to a second embodiment of the present invention) is shown.

[0140] Figure 1 A coated glass sheet 100 suitable for a vehicle window glass is depicted, which comprises a glass substrate 10 and a coating sequence 11, wherein the coating sequence 11 sequentially comprises, starting from the glass substrate 10:

[0141] a base layer 1 in direct contact with the glass substrate 10;

[0142] a first undercoat 21;

[0143] A first silver-based functional layer 31 in direct contact with the first lower coating 21;

[0144] A first upper layer 41 in direct contact with the first silver-based functional layer 31;

[0145] A first intermediate dielectric coating 51;

[0146] A second lower coating 22;

[0147] A second silver-based functional layer 32 in direct contact with the second lower coating 22;

[0148] A second upper layer 42 in direct contact with the second silver-based functional layer 32; and

[0149] An upper dielectric coating 6, wherein:

[0150] The coating sequence includes a plurality of upper layers 41 in direct contact with the first silver-based functional layer 31;

[0151] The plurality of upper layers 41 includes a first upper layer and a second upper layer;

[0152] The first upper layer is in direct contact with the first silver-based functional layer 31 and includes zinc oxide; and

[0153] The second upper layer is in direct contact with the first upper layer and includes oxides of zinc and tin.

[0154] In this embodiment, the coating sequence 11 further includes:

[0155] A second intermediate dielectric coating 52;

[0156] A third lower coating 23;

[0157] A third silver-based functional layer 33 in direct contact with the second lower coating 23;

[0158] A third upper layer 43 in direct contact with the third silver-based functional layer 33, and

[0159] The upper dielectric coating 6 includes a first layer 61 and an outermost layer 62.

[0160] Those skilled in the art will understand that although in this embodiment the first upper layer is a plurality of upper layers, and the second upper layer is not a plurality of upper layers, alternative embodiments may be provided, wherein:

[0161] The first upper layer is a plurality of upper layers, and the second upper layer is a plurality of upper layers, and the third upper layer is a plurality of upper layers; or

[0162] The first upper layer is not a multi-layer upper layer, and the second upper layer is a multi-layer upper layer, and the third upper layer is a multi-layer upper layer; or

[0163] The first upper layer is not a multi-layer upper layer, and the second upper layer is not a multi-layer upper layer, and the third upper layer is a multi-layer upper layer; or

[0164] In other alternative combinations, the first upper layer is not a multi-layer upper layer, the second upper layer is a multi-layer upper layer, and the third upper layer is not a multi-layer upper layer.

[0165] Figure 2 A laminated window glass 200 according to a second embodiment of the present invention is depicted, which includes a coated glass plate 100, a second glass plate 300, and an intermediate layer 400 therebetween.

[0166] Exemplary embodiments of the present invention will now be described herein only by way of example.

[0167] For all embodiments, using an AC and / or DC magnetron (or pulsed DC) sputtering device, a coating is deposited on a standard float glass plate with a thickness of 4 mm and a light transmittance of about 90%, and medium frequency sputtering is applied where appropriate.

[0168] A layer containing oxides of zirconium and titanium can be reactively co-sputtered from a first titanium metal target and a second zirconium metal target in an argon / oxygen (Ar / O2) sputtering atmosphere.

[0169] A layer containing oxides of zinc and tin is reactively sputtered from a zinc-tin target (weight ratio of metal Zn:Sn is about 50:50) in an argon / oxygen (Ar / O2) sputtering atmosphere.

[0170] A layer containing oxides of zinc (Zn), tin (Sn), and zirconium (Zr) is co-sputtered using metal ZnSn (weight ratio of Zn:Sn is about 50:50) and a Zr target in an Ar / O2 or pure argon (Ar) atmosphere.

[0171] A layer containing aluminum-doped zinc oxide (ZnO:Al) is sputtered from an Al-doped Zn target (aluminum (Al) content is about 2 wt%) in an Ar / O2 sputtering atmosphere.

[0172] In all embodiments, in an Ar sputtering atmosphere, without any added oxygen and at a residual oxygen partial pressure below 10 -5 mbar, a functional layer composed of substantially pure silver (Ag) is sputtered from a silver target.

[0173] In a pure argon (Ar) sputtering atmosphere with less than 5% oxygen, from a conductive ZnO containing 2 wt% AlO x of x: A layer containing aluminum-doped zinc oxide that is directly adjacent to the Al target sputtered silver-based functional layer.

[0174] Table 1 provides details of the coated glass plates of the present invention. When providing a NiCrO x layer instead of the ZnO:Al / ZnSnO of Examples 1A and 2A x multilayer, the layer thicknesses in Examples 1B and 2B were changed to maintain the optical properties. Examples 1A and 1B have a zirconia outer layer.

[0175] Table 1

[0176] Example 1A Example 1B Example 2A Example 2B Glass Glass Glass Glass SiNx(30) SiNx(30) SiNx(30) SiNx(30) ZnO:Al(16.4) ZnO:Al(16.4) ZnO:Al(16.4) ZnO:Al(16.4) Ag(15.1) Ag(15.1) Ag(15.1) Ag(15.1) ZnO:Al(2) NiCrOx(0.4) ZnO:Al(2) NiCrOx(0.4) ZnSnOx(2) ZnSnOx(2) ZnO:Al(12.5) ZnO:Al(14.9) ZnO:Al(12.5) ZnO:Al(14.9) SiNx(46.8) SiNx(46.8) SiNx(46.8) SiNx(46.8) ZnO:Al(15.9) ZnO:Al(15.9) ZnO:Al(15.9) ZnO:Al(15.9) Ag(15.7) Ag(15.7) Ag(15.7) Ag(15.7) ZnO:Al(2) NiCrOx(0.4) ZnO:Al(2) NiCrOx(0.4) ZnSnOx(2) ZnSnOx(2) ZnO:Al(10.4) ZnO:Al(12.8) ZnO:Al(10.4) ZnO:Al(12.8) SiNx(48.9) SiNx(48.9) SiNx(48.9) SiNx(48.9) ZnO:Al(15.9) ZnO:Al(15.9) ZnO:Al(15.9) ZnO:Al(15.9) Ag(13.8) Ag(13.8) Ag(13.8) Ag(13.8) ZnO:Al(2) NiCrOx(0.4) ZnO:Al(2) NiCrOx(0.4) ZnSnOx(2) ZnSnOx(2) ZnO:Al(11.2) ZnO:Al(13.8) ZnO:Al(11.2) ZnO:Al(13.6) SiNx(20.6) SiNx(20.6) SiNx(26.6) SiNx(26.6) ZrO2(6) ZrO2(6)

[0177] After coating deposition, the samples were heat-treated at about 650 °C for 5 minutes. Then, haze scans, sheet resistance (Rs HT), and transmittance (TL% HT) were measured. Table 2 provides the measured properties of the coated glass plates of the examples.

[0178] Table 2

[0179] Example 1A Example 1B Example 2A Example 2B Haze scan 59 102 45 97 Rs HT 1.13 0.96 1.24 0.98 TL%HT 75.9 75.9 75.0 75.7

[0180] As can be seen from Table 2, Examples 1B and 2B have a certain level of haze scan, which may provide a very high visual haze for the observer, which is undesirable when used in vehicle window glass, especially windshields. The removal of the NiCrO x layer and its replacement with an overcoat on the multilayer result in a greatly improved haze scan while maintaining similar transmittance and sheet resistance. This indicates that a heated vehicle window glass incorporating a coated plate according to Example 1A or 2A will have greatly improved visual clarity compared to Example 1B or 2B, while still providing acceptable defogging performance.

[0181] The method for collecting the data in Table 2 is described below.

[0182] Transmittance - The percentage (%) of transmittance of the coated glass plate during heat treatment. The value of the transmittance is obtained from measurements using a light source D65 for a 10-degree observer field of view in the wavelength range of 350 - 1050 nm.

[0183] Sheet resistance / sheet resistance change of the examples - Sheet resistance measurements were performed using a NAGY SRM-12. This device uses an inductor to generate eddy currents in a 100 mm × 100 mm coated sample. This generates a measurable magnetic field, the magnitude of which is related to the resistivity of the sample. Using this method, the sheet resistance can be calculated. The instrument was used to measure the sheet resistance of the sample before and after heat treatment at 650 °C for 5 minutes.

[0184] Haze Scanning – The haze scoring system was applied to each of the examples and comparative examples, where the haze was measured after heat treatment. The quality assessment evaluation system described below was also used to more clearly distinguish the visual quality of the coatings under bright light conditions; performance that is not fully reflected in the standard haze value measured according to ASTM D1003.

[0185] The evaluation system takes into account the more macroscopic effects of visible defects in the coating, which cause local color changes at damaged or imperfect areas of the coating (haze scanning in Table 1). This evaluation analyzes the light levels in an image of the heat-treated sample taken using fixed lighting conditions and geometry.

[0186] To produce an image for calculating the haze scanning value, the sample was placed inside a black box, 30 cm from the camera lens. The sample was illuminated with a standard 1200 lumen light, and the brightness was between 2400 and 2800 Lux when measured at the sample position. The sample was then photographed with a standard aperture size of f5.6 and an exposure length of 1 second, at a focal length of 105 mm and ISO 400. The gray scale of each pixel in the resulting image was then recorded, with a value of 0 representing black and 255 representing white. These values were statistically analyzed to give an overall assessment of the sample haze, referred to herein as the haze scanning value. The lower the recorded haze scanning value, the better the result. Generally, it is desirable for the haze scanning value to be less than 90, preferably less than 80, and even more preferably less than 70. In some specialized applications, where clarity is a priority, it is desirable for the haze scanning value to be less than 60.

[0187] Surprisingly, the coatings of the present invention exhibit parameters indicating that they are suitable for applications requiring tempered sheets. In particular, the haze scanning of the examples according to the present invention measured after heat treatment is significantly low, in some cases less than 50.

Claims

1. A coated glass sheet (100) suitable for automotive window glass, comprising a glass substrate (10) and a coating sequence (11), wherein the coating sequence (11) sequentially comprises, starting from the glass substrate (10): A base coating (1), which comprises a base layer in direct contact with the glass substrate (10); A first undercoat (21); A first silver-based functional layer (31) in direct contact with the first undercoat (21); A first overcoat (41) in direct contact with the first silver-based functional layer (31); A first intermediate dielectric coating (51); A second undercoat (22); A second silver-based functional layer (32) in direct contact with the second undercoat (22); A second overcoat (42) in direct contact with the second silver-based functional layer (32); and An upper dielectric coating (6), wherein: The coating sequence comprises a multi-layer overcoat in direct contact with the silver-based functional layer; The multi-layer overcoat comprises a first overcoat layer and a second overcoat layer; The first overcoat layer is in direct contact with the silver-based functional layer and comprises an oxide of zinc; and The second overcoat layer is in direct contact with the first overcoat layer and comprises oxides of zinc and tin.

2. The coated glass sheet (100) according to any one of the preceding claims, wherein the first overcoat layer has a thickness of 0.5 - 10 nm, preferably 0.5 - 5 nm, more preferably 0.5 - 3 nm, and most preferably 0.5 - 2 nm.

3. The coated glass sheet (100) according to any one of the preceding claims, wherein the second overcoat layer has a thickness of 0.5 to 20 nm, preferably 0.5 to 10 nm, more preferably 0.5 to 5 nm, more preferably 0.5 to 3 nm, and most preferably 0.5 to 2 nm.

4. The coated glass sheet (100) according to any of the preceding claims, further comprising, between the second overcoat layer (42) and the upper dielectric coating (6): A second intermediate dielectric coating (52); A third undercoat (23); A third silver-based functional layer (33) in direct contact with the third undercoat (23); and A third overcoat (43) in direct contact with the third silver-based functional layer (33).

5. The coated glass sheet (100) according to claim 4, further comprising, between the third overcoat layer (43) and the upper dielectric coating (6): A third intermediate dielectric coating; A fourth undercoat; A fourth silver-based functional layer in direct contact with the fourth undercoat; and A fourth overcoat in direct contact with the fourth silver-based functional layer.

6. The coated glass sheet (100) according to any one of the preceding claims, wherein each overcoat layer in direct contact with the silver-based functional layer comprises a multi-layer overcoat in direct contact with the silver-based functional layer; Each multi-layer overcoat comprises a first overcoat layer and a second overcoat layer; Each first overcoat layer is in direct contact with the silver-based functional layer and comprises an oxide of zinc; and Each second overcoat layer comprises oxides of zinc and tin.

7. The coated glass sheet (100) according to claim 6, wherein each first overcoat layer has a thickness of 0.5 - 10 nm, preferably 0.5 - 5 nm, more preferably 0.5 - 3 nm, and most preferably 0.5 - 2 nm.

8. Coated glass sheet (100) according to claim 6 or claim 7, wherein each second upper layer has a thickness of 0.5 - 20 nm, 0.5 - 15 nm, preferably 0.5 - 10 nm, more preferably 0.5 - 5 nm, even more preferably 0.5 - 2 nm.

9. Coated glass sheet (100) according to claim 6 or claim 7, wherein each second upper layer between two silver-based functional layers has a thickness of 0.5 to 10 nm, preferably 0.5 to 5 nm, more preferably 0.5 to 3 nm, most preferably 0.5 to 2 nm, and wherein the uppermost upper layer has a thickness of 10 to 15 nm.

10. Coated glass sheet (100) according to any one of the preceding claims, wherein the base layer comprises an oxide of zirconium and / or titanium or a nitride and / or oxide of silicon, preferably wherein the base layer comprises an oxide of zirconium and / or titanium or a nitride and / or oxide of silicon and has a thickness of 5 to 100 nm, preferably 10 to 50 nm, more preferably 20 to 40 nm.

11. Coated glass sheet (100) according to any one of the preceding claims, wherein the first lower coating comprises a layer containing zinc oxide in direct contact with the overlying silver-based functional layer, preferably each lower coating comprises a layer containing zinc oxide in direct contact with the overlying silver-based functional layer.

12. Coated glass sheet (100) according to any one of the preceding claims, wherein the coating sequence (11) does not comprise a layer containing nickel and chromium adjacent to the silver-based functional layer, preferably, the coating sequence (11) does not comprise a layer containing nickel and chromium.

13. Coated glass sheet (100) according to any one of the preceding claims, wherein the intermediate dielectric coating (51, 52) comprises a first intermediate layer containing zinc oxide in direct contact with the multi-layer upper coating on the silver-based functional coating, preferably, each intermediate dielectric coating (51, 52) comprises a first intermediate layer containing zinc oxide in direct contact with the multi-layer upper coating on the silver-based functional coating.

14. Coated glass sheet (100) according to any one of the preceding claims, wherein the intermediate dielectric coating (51, 52) comprises a first intermediate layer in direct contact with the multi-layer upper coating on the silver-based functional coating and having a thickness of 10 - 20 nm, preferably each intermediate dielectric coating (51, 52) comprises a first intermediate layer in direct contact with the multi-layer upper coating on the silver-based functional coating, and the first intermediate layer has a thickness of 10 - 20 nm.

15. Coated glass sheet (100) according to claim 13 or claim 14, wherein the intermediate dielectric coating comprises a second intermediate layer containing a nitride of silicon and / or aluminum, and the second intermediate layer has a thickness of 30 - 60 nm, preferably each intermediate dielectric coating comprises a second intermediate layer containing a nitride of silicon and / or aluminum, and the second intermediate layer has a thickness of 30 - 60 nm.

16. Coated glass sheet (100) according to any one of the preceding claims, wherein the upper dielectric coating (6) sequentially comprises a layer (61) containing a nitride of silicon and / or aluminum starting from the glass substrate, and an outermost layer (62).

17. The coated glass sheet (100) according to any one of the preceding claims, wherein the upper dielectric coating (6) comprises an outermost layer (62), and the outermost layer comprises an oxide of zirconium, an oxide of silicon and / or aluminum, an oxide of zinc and tin, or a nitride of silicon and / or aluminum.

18. The coated glass sheet (100) according to any one of the preceding claims, wherein the first silver-based functional layer has a thickness of 3 nm to 20 nm, preferably each silver-based functional layer has a thickness of 3 nm to 20 nm, and more preferably each silver-based functional layer has a thickness of 5 nm to 18 nm.

19. The coated glass sheet (100) according to any one of the preceding claims, wherein the coating sequence (11) is removed around the perimeter of the coated glass sheet (100).

20. A method of manufacturing a coated glass sheet (100) according to any one of the preceding claims, comprising the following steps: i) providing a glass substrate; and ii) sequentially coating the glass substrate with coatings by sputtering.

21. The method of manufacturing a coated glass sheet (100) according to claim 20, further comprising the following step after step ii): iii) heat-treating the glass substrate, preferably, wherein heat-treating the glass substrate comprises bending or tempering.

22. A laminated window glass (200), preferably a windshield, comprising the coated glass sheet (100) according to any one of claims 1 to 19, a further glass sheet (300), and an intermediate layer (400) between the coated glass sheet (100) and the further glass sheet (300).

23. A method of manufacturing a laminated window glass (200) according to claim 22, comprising the following steps: i) providing an assembly comprising the coated glass sheet (100) according to any one of claims 1 to 19, a further glass sheet (300), and an intermediate layer (400) between the coated glass sheet (100) and the further glass sheet (300); and ii) subjecting the assembly to a lamination process, preferably in an autoclave.

24. A vehicle window glass comprising the laminated window glass (200) according to claim 22.

25. The vehicle window glass according to claim 24, further comprising a bus bar and / or a connector for supplying electrical energy to the coating sequence (11).

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