DE19616841B4 - Coated glassy material panel with high translucency, low solar factor and neutral appearance when reflected and used in a multiple glazing unit - Google Patents

Abstract

A coated glassy material sheet having a high degree of light transmission, a low solar factor and a neutral reflection appearance, comprising a surface bearing the following coating layers in the order listed:
(i) a first layer of transparent dielectric non-absorbing material adjacent to the wafer having an optical thickness of between 63 and 72 nm;
(ii) a first layer of silver or silver alloy having a geometric thickness of between 9.5 and 10.5 nm;
(iii) a second layer of transparent dielectric non-absorbing material having an optical thickness of between 144 and 160 nm;
(iv) a second layer of silver or silver alloy having a geometric thickness of between 13 and 14 nm;
(v) a third layer of transparent dielectric non-absorbing material having an optical thickness of between 50 and 58 nm;
so that the coated disc shows the following properties:
a light transmittance TLC of more ...

Description

These The invention relates to a coated pane of vitreous material, in particular a coated disc of vitreous material with a high degree Light transmission, a low solar factor and a neutral appearance in reflection, and their use in a multiple glazing unit.

coated Substrates find use in different fields for different Purposes. For example, coated glass becomes less emissive or solar shielding discs for use in buildings and Vehicles used.

Around give the coated substrate specific desired properties, For example, the coating may comprise multiple layers, each of which meets special requirements of the coating. The layer compositions and their thicknesses are ordinary narrowly defined to meet the specific requirements of the To ensure coated substrate in total.

WO 90/02653 A1 describes a solar control layer coating for glass windows.

U.S. Patent 4,996,105A describes a transparent, laminated product.

The U.S. Patent 4,985,312A relates to a glass sheet having a multi-layer coating to impart heat-reflecting properties to the glass. A base layer of indium-tin oxide or AlN is deposited on the wafer, followed by alternating heat-reflecting layers of silver or copper having a thickness of 40 to 200 Å (4 to 20 nm), barrier layers of metallic zinc having a thickness of 20 to 200 Å 2 to 20 nm and protective layers of the same material as the base layer.

EP 110 277 228 B1 relates to a glass assembly which deals with the transmission of light in the visible spectrum while blocking the solar radiation outside the visible spectrum. The assembly comprises a glass substrate having successively from the substrate a stack of coating layers, a first layer of dielectric material, a second layer of reflective material, third and fourth layers of dielectric material, a fifth layer of reflective material, and a sixth layer of dielectric material, wherein the illumination A transmission through the array is at least 70% and the total solar transmission is less than 55%.

The WO 90/05439 A1 Similarly, it relates to transparent glazing units having transparent coating stacks for reducing solar permeability and increasing solar reflectance. The coatings comprise electrically conductive components which permit the optical heating of the glazing units. In its broadest aspect, the claimed stack comprises at least two layers of 80 to 180 Å 8-18 nm thick silver metal sandwiched between layers of dielectric material and further comprising a transparent protective cover, whereby the glazing unit has an illumination A transmittance of at least 70% Lighting C-reflection of not more than 12.5%, a total solar reflection of at least 29% and a total solar permeability of not more than 42%. The dielectric layers outside the silver layers are 200-500 Å 20-50 nm thick, and the dielectric layers between the silver layers are 400-1500 Å 40-150 nm thick.

The The present invention relates to specific components and specifically elected Ranges of thicknesses of the layers in a coating stack, to the desired Combination of a high degree of Light transmission, a low solar factor and a neutral appearance in reflection to obtain.

For coated substrates to be used in windows for buildings or vehicles, it is desirable that the product from which the coated substrate forms part should transmit a not too large part of the total incident solar radiation, ie the interior of the building or vehicle is not overheated in sunny weather. The permeability of the total incident solar radiation can be expressed by the "solar factor" (here F _S ). As used herein, the term "solar factor" means the sum of the energy that is transmitted directly and the energy that is absorbed and re-radiated on the side away from the energy source and is part of the total radiant energy incident on the coated substrate. The solar factor values given here are measured according to document no. 20 of 1972 of the CIE (Commision Internationale de I'Eclairage).

The international patent application WO 93/19936 A1 (CARDINAL IG COMPANY) shows a Be Layer for a transparent substrate showing a neutral color when transmitted over a wide range of angles of incidence of the light. The coating uses a base layer adjacent to the transparent substrate having a thickness of not more than about 27.5 nm, and may comprise two reflective metal layers having an intermediate layer of an antireflective metal oxide and an outer antireflective layer of metal oxide over the second reflective metal layer. Such a multi-layer coated substrate gives a light transmittance of only 60% with a strong blue color upon reflection. However, it is desirable that the coated substrate have high visible transmission such that, for example, the occupants of a building can see out and enough light enters the building to allow residents to work without undue use of artificial light. As used herein, the term "light transmission" (here TLC) means the flux of light left through the coated substrate as a percentage of the incident light flux expressed by standard illumination C (CIE).

in the Commercially available Solar shielding products are glass panes, which are a single or wear a multiple coating.

It is desired To provide coated substrates, which in reflection from the Side opposite the coated side (the "opposite" side as used here) are practically neutral, d. H. the purity of the reflected color is low. It has been found that low purity of color especially difficult at the same time with a low solar factor and to achieve a high degree of light transmission. The purity of a color is defined according to a linear scale, where a defined white light source a Purity of zero and a pure color of 100% purity. By the term "color purity" as used here is, is the excitation or the excitation purity meant, measured with illumination C, as defined in International Lighting Vocabulary, issued by the International to Commission Illumination (C. I.E.), 1987, pages 87 and 89. The "color purity" is from the opposite side of the product.

Coated substrates of the prior art tend to have a predominant wavelength (λ _D ) upon reflection and a change in color purity according to the viewing angle and, in particular, that coated substrates have a pinkish appearance when viewed at 45 ° to the opposite surface to be viewed as.

It One object of the present invention is a coated substrate with a high degree of light transmission, a low solar factor and a neutral appearance in reflection to deliver.

It it was found that this Target can be achieved and other benefits can be achieved through a multi-coated substrate in which the coating layers are made of specific materials and within more specific Thickness limits are present.

• (i) eine erste Schicht von transparentem dielektrischem nicht-absorbierenden Material, angrenzend an die Scheibe, mit einer optischen Dicke von zwischen 63 und 72 nm;
• (ii) eine erste Schicht von Silber oder Silberlegierung mit einer geometrischen Dicke von zwischen 9,5 und 10,5 nm;
• (iii) eine zweite Schicht von transparentem dielektrischem nicht-absorbierendem Material mit einer optischen Dicke von zwischen 144 und 160 nm;
• (iv) einer zweiten Schicht von Silber oder Silberlegierung mit einer geometrischen Dicke von zwischen 13 und 14 nm;
• (v) eine dritte Schicht aus transparentem dielektrischem nicht-absorbierenden Material mit einer optischen Dicke von zwischen 50 und 58 nm;

so daß die beschichtete Scheibe die folgenden Eigenschaften zeigt:
eine Lichtdurchlässigkeit TLC von mehr als 70%, vorzugsweise wenigstens 75%;
einen Solarfaktor F_S von weniger als 47%, vorzugsweise nicht mehr als 46% und
am meisten bevorzugt nicht mehr als 45%; und
eine Reinheit der Färbung bei Reflexion senkrecht zur entgegengesetzten Oberfläche von nicht mehr als 12%, vorzugsweise nicht mehr als 10% und am meisten bevorzugt nicht mehr als 9%.According to the invention there is provided a coated glassy material sheet having a high degree of light transmission, a low solar factor and a neutral reflection appearance, comprising a surface bearing the following coating layers in the order given:

• (i) a first layer of transparent dielectric non-absorbing material adjacent to the wafer having an optical thickness of between 63 and 72 nm;
• (ii) a first layer of silver or silver alloy having a geometric thickness of between 9.5 and 10.5 nm;
• (iii) a second layer of transparent dielectric non-absorbing material having an optical thickness of between 144 and 160 nm;
• (iv) a second layer of silver or silver alloy having a geometric thickness of between 13 and 14 nm;
• (v) a third layer of transparent dielectric non-absorbing material having an optical thickness of between 50 and 58 nm;

so that the coated disc has the following properties:
a light transmittance TLC of more than 70%, preferably at least 75%;
a solar factor F _S of less than 47%, preferably not more than 46% and
most preferably not more than 45%; and
a purity of coloration when reflected perpendicularly to the opposite surface of not more than 12%, preferably not more than 10%, and most preferably not more than 9%.

The mentioned properties of the coated disc are based on a single slice of ordinary Clear soda-lime glass with a thickness of 6 mm, observed from the Side, opposite to the coated side, d. H. from the glass side. In this regard, note that the opposite side usually is uncoated.

The Relationship between the thickness of different layers of non-absorbent material and the optical properties of the coated disc will not perfectly understood, however, it is clear that the thickness of these layers is critical.

at the arrangement and the thickness of the coating layers as here are defined and claimed, the coated disc (substrate) has a high light transmission, a low solar factor and a neutral color in reflection of the opposite side. Furthermore is the stability the coloring high, d. H. that in the Case of a limited change in the thickness of one of the layers (for example of a Lack of uniformity the thickness between one point on the substrate to another comes) no significant change in the coloring occurs and that the coloring close to neutral, if the viewing angle tends towards to go the vertical to the opposite side.

on the other hand The coated disc according to the invention contributes to coloration Reflection when observed perpendicular to the opposite side the aesthetic pleasant without them yellow or pink would be. If the purity of the reflection is low, there may be a hint of yellow or pink be noticeable. This coloring remains aesthetic pleasant, even when viewed at an angle to the surface is, d. H. the reflected color will not turn yellow or pink, though the observation angle decreases. This is a very important factor if you consider glazing panes, in a big one building are. Actually for example, the viewing angle of the facade of a building is different, if a stationary Viewer on the ground floor, a middle storey or the top floor of the building looks. If the glazing panes on the ground floor appear blue-green while those in a middle storey appear pink, this change is quite noticeable. In a similar way, when the viewer turns would move would the Changing viewing angles, however, the coloring should remain the same within the preferred aesthetic norms.

On the other hand, this particular arrangement of layers allows low light reflection (here R _L ) to be obtained near the light reflection achieved with an uncoated substrate.

In the coated wafers according to the invention, the nature and thickness of the coating layers may be such that the direct energy transmission T _ED (defined as the fraction of solar energy transmitted through the coated wafer without change in wavelength) is preferably 34% to 40% %, advantageously 36% to 39%.

The The type and thickness of the coating layers may be such that the color purity remains neutral when the observation angle changes, in particular that the coated disc a purity of color in reflection at one Angle of 45 ° to opposite surface less than 9%, most preferably less than 6%.

at an angle of 60 ° to opposite surface (Conventionally, the perpendicular to the surface is taken as 0 °) is the purity the reflected color preferably less than 1%.

When the coated disc is used in a simple glazing unit consisting of a single coated disc of clear glass with a thickness of 6 mm, the light transmittance TLC is preferably between 70% and 81%, advantageously 75% to 79%, the solar factor is preferred 41% to 46%, and the light reflection R _L is preferably not more than 8%. The color of the reflection from the opposite side is neutral with a purity of preferably not more than 10%, more preferably not more than 9%. The dominant wavelength of reflection is preferably between 485 and 505 nm. Above this range, yellowing is observed. Below this range, a pink color is observed as the viewing angle changes. When the purity of the color is at least 3% when reflected normal to the opposite surface, it is easier to prevent the color from pinking as the viewing angle moves away from the vertical, especially when the dominant wavelength is at the lower end of the preferred range , In fact, when the purity is on the order of 1 to 2% and the dominant wavelength is less than 495 nm, the color tends to pink as the viewing angle moves away from the vertical, and this is particularly noticeable by the eye despite the very low purity ,

The Metal layers include silver or a silver alloy, such as alloys of silver with platinum or palladium.

The coated disc according to the invention may further comprise a layer of sacrificial material overlying (i. H. subsequently) deposited and provided in contact with each metal layer. The purpose of this layer of sacrificial material is the silver or the silver alloy during the deposition of the next to protect non-absorbent layer.

The coating layers are preferably applied by cathode spraying. For reasons relating to the cathode sputtering process, each metal layer is coated with a thin layer of sacrificial metal (a "barrier" layer) which is converted into the oxide during the coating process. This sacrificial metal is preferably titanium, although zinc, copper, a nickel / chromium alloy or aluminum may alternatively be used. A corresponding barrier layer may optionally be arranged below each metal layer. The sacrificial material is preferably present in a substantially fully oxidized state, since the unoxidized material may have the effect of decreasing light transmission. The sacrificial material is oxidized during deposition of the next layer when the next layer is deposited in a reactive (eg, O ₂ ) atmosphere. The term "sacrificial material" as used herein is intended to encompass not only the sacrificial metal as deposited on the silver or silver alloy layers, but also the oxide or partial oxide into which the sacrificial metal is transferred during further processing. While these sacrificial layers provide an improvement by protecting the silver layer against oxidation, further improvement in chemical durability by increasing the thickness of the sacrificial layer reduces the light transmissivity of the products. The thickness of the sacrificial material layers, if present, are therefore critical to the present invention.

It is preferred that a first layer of sacrificial material (iia) with a geometric thickness of between 2.5 and 5 nm between the first metal layer (ii) and the second non-absorbing layer (iii) and a second one Layer of sacrificial material (iva) with a geometric thickness of between 3 and 6 nm between the second metal layer (iv) and the third non-absorbing layer (v) is provided.

If the next layer of non-absorbent material is a nitride (eg, Si ₃ N ₄ ) rather than an oxide, the layer is deposited in an atmosphere of nitrogen. In this case, one need not deposit a layer of sacrificial material over the silver or silver alloy before depositing the nitride in a nitrogen atmosphere.

The coating layers can be supplemented by a protective layer, such as a thin (3 nm geometric) layer of SiO ₂ , which protects the coating without appreciably altering the optical properties of the product. Otherwise, the third non-absorbing layer will usually be an exposed layer.

Preferably, the optionally present thin exposed protective additive layer is selected from oxides, nitrides and oxynitrides of silicon. This layer provides the coated disc with improved chemical and / or mechanical durability while minimizing any subsequent change in optical properties. Advantageously, this exposed protective additive layer is SiO ₂ , most preferably with a thickness of 2 to 5 nm (geometric).

Especially, if the thickness of the protective layer is low, its effect on the optical property of the product to be minimal.

The Products according to the invention can to be used with benefit in laminated glass structures. As glazing panes can Products are installed in single or multiple glazing arrangements. The coated discs can for one Area can be used for various purposes, such as glazing units on buildings, especially as double glazing units and also as windscreens for vehicles, like laminated glass structures.

A Multiple glazing unit can have at least two slices of transparent glassy material, the area to area at a distance from each other are arranged and have a gas space in between, by a is limited around the circumference extending spacers, wherein at least one of the discs comprises a coated disc according to the present invention Invention, wherein the coated surface directed against the gas space is.

A laminated glazing unit may consist of at least two panes transparent glassy material containing each other Attached help of an intermediate film of polymer adhesive material wherein at least one of the discs is a coated disc according to the present Invention, wherein the coated surface against the polymer adhesive is directed.

In preferred embodiments of the invention, where the coated pane is built into a double glazing unit consisting of two sheets of clear glass, each 6 mm thick, with an intermediate space of 15 mm filled with argon, the light transmittance TLC is between 62%. and 72%, advantageously between 66% and 70%, the solar factor F _s is between 34% and 40%, advantageously between 36% and 39%, the purity of the color on reflection perpendicular to the opposite surface is not more than 8%, on most preferably not more than 7%, and the light reflection is not more than 12%. For the determination of the properties of such embodiments, the unit is considered to be installed with the coating in position "2" (with the opposite side in position "1"), ie the coated disk is placed against the outside, the coated surface directed against the inner gas space of the double glazing unit.

The non-absorbing layers may be represented by a single non-absorbent material such as zinc oxide, tin oxide or silicon nitride, a mixture or complex of non-absorbent materials such as Zn ₂ SnO _4, or by a number of successive layers.

By the term "non-absorbent material" as used herein is meant materials having a "refractive index" (nλ) greater than, preferably substantially greater than, the value of the "spectral absorption index" k (λ) over the entire visible spectrum (380 to 780 nm). The definitions of refractive index and spectral absorption index can be found in International Lighting Vocabulary, edited by the International Commission on Illumination (CIE), 1987, pages 127, 138, and 139. It has been found particularly advantageous to choose a material for which the refractive index n (λ) is greater than ten times the spectral absorption index k (λ) over the wavelength range 380 to 780 nm. Most preferably, the material of the non-absorbing coating layers, selected from aluminum nitride, silicon nitride, tin IV oxide, zinc oxide, zirconium oxide and mixtures thereof. It should be noted that silicon nitride is deposited using a cathode of silicon doped with, for example, aluminum, nickel, boron, phosphorus and / or tin to facilitate the deposition process. As a result, these dopants may be present in the layer of non-absorbent material. Preferably, the non-absorbing material has a refractive index, measured at 550 nm, between 1.85 and 2.2, advantageously between 1.9 and 2.1. Zinc oxide is a particularly preferred material because of its high deposition rate, well-matched refractive index for the purpose of the invention, and its favorable effect on passivation of the silver layer, but because of its relatively high porosity in thick coatings and poor chemical resistance, it is preferred to use Zinc oxide layer in two or more layers by another non-absorbing material, which is deposited therebetween, such as tin IV oxide. Thus, preferably one or more of these layers of non-absorbent material are composite coating layers, i. h is a single layer containing two or more nonabsorbent materials deposited simultaneously and / or sequentially. Advantageously, one or more of these layers of non-absorbent material is alternately formed by zinc oxide and tin IV oxide, such as ZnO / SnO ₂ / ZnO or ZnO / SnO ₂ / ZnO / SnO ₂ / ZnO / ... etc.

In some embodiments, such as for use in the field of vehicle windows, such as laminated windshields, silicon nitride (Si ₃ N ₄ ) is particularly preferred as a non-absorbent material, particularly with regard to its chemical resistance. In this case, a sacrificial material is not really favorable, and thus it is not necessarily required between the silver layer and the non-adsorbing layer deposited thereon.

It be it noted that it in the non-absorbent material coating layer of metal oxide or -nitride not essential for the metal and the oxygen or nitrogen is in stoichiometric Relationships available to be.

It can still other coating layers should be provided, but was found that this is the Can have an effect to reduce the light transmission. Just Two or three metal layers are therefore preferred.

The substrate is in the form of a sheet of vitreous material, such as glass or some other ren transparent rigid material.

Preferably the substrate is clear glass, although the invention also applies to the Use of colored Extends glass as a substrate where the invention provides the advantage that the inherent Color of the substrate is not appreciably changed by the coating.

The Process for the formation of the products according to the invention can be carried out by introducing of the substrate into a processing chamber containing a suitable magnetron spray source contains and with inlet and outlet gas locks is provided, a transport device for the substrate, energy sources, inlets for the spray gas and an evacuation outlet. The substrate is moved past the activated spray source and cold by means of a suitable atmosphere (oxygen gas in the case an oxide coating), to the desired Layer on the substrate to deliver. This method is used for every coating layer repeated.

The Invention will now be more detailed with reference to the following non-limiting examples.

example 1

A Glass disc (substrate) was introduced into a process chamber, the a number of planar magnetron spray sources and with input gas locks, a conveyor for the Substrate, energy sources, Sprühgaseinlässen and provided an evacuation outlet was. The deposition is achieved by multiplying the substrate is carried out under the same cathodes. The on-line decommissioning apparatus contains two deposition chambers and an entrance lock. The first chamber should for the deposition of oxides (or nitrides) in a reactive atmosphere (oxygen or nitrogen) and contains a number of cathodes, which are provided with targets made of zinc and tin, the for the deposition of the coating are required. The second chamber is for the deposition of metals in an inert atmosphere (Ar) determined and included a silver cathode and a titanium cathode. The substrate makes one Number of return movements under the cathodes, which activated as needed are to the desired To obtain succession of coating layers. The pressure in each chamber was reduced to 0.3 Pa.

The coated product had the following composition and optical properties: substrate: 6 mm clear glass Layer (i) 35 nm zinc oxide Layer (ii) 9.5 nm silver Layer (iia) 3 nm titanium Layer (iii) 75 nm zinc oxide Layer (iv) 13.5 nm silver Layer (iva) 5.5 nm titanium Layer (v) 26 nm zinc oxide Single glazing panel: Permeability (TLC) 76% Solar factor (F _S ) 43.5% Direct energy transmission (T _ED ) 37% light reflection 7 to 8% Purity of the reflexted color (vertical) 6.6% Outer pane of a double glazing unit: Permeability (TLC) 67% Solar factor (F _S ) 37% light reflection 10 to 11% Dominant wavelength λ _D (vertical) 490 nm Purity of color (vertical) 6.3% Dominant wavelength λ _D (45 °) 490 nm Purity of color (45 °) 4.5%

Example 2

In a first modification of Example 1, the layers of zinc oxide were subdivided into ZnO / SnO ₂ / ZnO layers according to the ratios 3/4 ZnO and 1/4 SnO ₂ . The overall thickness of these layers is proportionally reduced to account for the difference between the refractive index of ZnO (about 2.0) and SnO ₂ (about 1.9) to obtain the same optical thickness as the ZnO only layers of Example 1 The observed properties are identical, but the coating is more corrosion resistant.

Examples 3 and 4

In modifications of Example 2, a thin (3 nm) protective layer of SiO _{2 was} deposited on the last coating layer without altering the optical properties of the coated substrate while providing improved chemical and / or mechanical durability to the coated substrate in the case of both Examples 3 and 4, and while this was fully compatible with the PVB (polyvinyl butyral) intermediate film in the case of Example 4.

Example 5 to 9

In further variations of Example 1, coatings of the compositions shown in Table A1 were applied to the glass substrate. According to the definitions in the claims, the thicknesses of the ZnO layers shown are optical thicknesses and those for Ag and Ti are geometric thicknesses. To help compare the optical and geometric thicknesses, it should be noted here that the refractive index of ZnO is 2.0 and the refractive index of TiO _{2 is} about 2.5 (optical thickness = geometric thickness × refractive index).

• * Vergleichsbeispiel

Tabelle A2 Beispiel Einzelverglasung Doppelverglasung TLC (%) F_S (%) λ_D (nm) Reinheit (%) TLC (%) F_S (%) λ_D (nm) Reinheit (%) 5* 74 44.7 456 5 66 37.2 460 3.6 6 72 42 493 12 65 34.9 494 9 7* 73.5 44 493 6 66 37.3 498 3.9 8 76 46 504 6 68 37 500 4 9* 74 46 496 10 66 36 498 7

• * Vergleichsbeispiel

The coated product had the optical properties shown in Table A2. It can be seen that the coating stacks of the invention achieve highly effective combinations of light transmission, solar factor and color purity. Perhaps most notable are the lower solar factors (Example 6) of only 42%. Table A1 example Coating layers (nm) ZnO Ag Ti ZnO Ag Ti ZnO 5 * 60 9 3 135 12 3 40 6 75 11 3 160 15 3 55 7 * 75 10 3 140 14 3 50 8th 75 9.5 3 156 13.5 3 56 9 * 60 9.5 3 156 13.5 3 56

• * Comparative Example

Table A2 example single glazing double glazing TLC (%) F _S (%) λ _D (nm) Purity (%) TLC (%) _S F (%) λ _D (nm) Purity (%) 5 * 74 44.7 456 5 66 37.2 460 3.6 6 72 42 493 12 65 34.9 494 9 7 * 73.5 44 493 6 66 37.3 498 3.9 8th 76 46 504 6 68 37 500 4 9 * 74 46 496 10 66 36 498 7

• * Comparative Example

Claims (18)

A coated glassy material sheet having a high degree of light transmission, a low solar factor and a neutral reflection appearance, comprising a surface bearing the following coating layers in the order listed: (i) a first layer of transparent dielectric non-absorbing material, adjacent to the disk, with an optical thickness of between 63 and 72 nm; (ii) a first layer of silver or silver alloy having a geometric thickness of between 9.5 and 10.5 nm; (iii) a second layer of transparent dielectric non-absorbing material having an optical thickness of between 144 and 160 nm; (iv) a second layer of silver or silver alloy having a geometric thickness of between 13 and 14 nm; (v) a third layer of transparent dielectric non-absorbing material having an optical thickness of between 50 and 58 nm; such that the coated disc exhibits the following properties: a TLC of more than 70%, a solar factor F _S of less than 47%, and a purity of the color when reflected perpendicular to the opposite surface of not more than 12%. Coated disc according to claim 1, characterized in that the nature and thickness of the coating layers are such that the coated disc has a direct energy transmission T _ED of 34 to 40%. Coated disc according to claim 1 or 2, characterized characterized in that the type and thickness of the coating layers such are the light transmittance TLC is not less than 75%. Coated disc according to any one of the preceding claims, characterized in that the nature and thickness of the coating layers are such that the solar factor F _{s is} not more than 46%, preferably not more than 45%. Coated disc according to any one of the preceding Claims, characterized in that the type and thickness of the coating layers so are the purity of the coloring not at reflection perpendicular to the opposite surface is more than 10%, preferably not more than 9%. Coated disc according to any one of the preceding Claims, characterized in that the type and thickness of the coating layers so are the purity of the coloring upon reflection perpendicular to the opposite surface at least 3% is. Coated disc according to any one of the preceding Claims, characterized in that the type and thickness of the coating layers such are that the coated disc with a purity of the coloring at Reflection at an angle of 45 ° to opposite surface of not more than 9%. Coated disc according to any one of the preceding claims, characterized that it further has a sacrificial material over and in contact with each metal layer. Coated disc according to claim 8, characterized in that that the sacrificial metal is titanium. Coated disc according to claim 8 or 9, characterized characterized in that the sacrificial material in virtually fully oxidized Condition exists. Coated disc according to any one of claims 8 to 10, characterized in that it contains: (iia) a first layer of sacrificial material with a geometric thickness of between 2.5 and 5 nm between the first layer of silver or silver alloy and the second layer of non-absorbent material; (Iva) a second layer of sacrificial material having a geometric thickness of between 3 and 6 nm, which is between the second layer of silver or silver alloy and the third layer of non-absorbent material lies. Coated disc according to any one of the preceding Claims, characterized in that the non-absorbing material is selected of zinc oxide, tin oxide, silicon nitride and mixtures thereof. Coated disc according to any one of the preceding Claims, characterized in that the non-absorbent material comprises a Refractive index, measured at 550 nm, has between 1.85 and 2.2. Coated disc according to claim 13, characterized in that that the non-absorbing material measured a refractive index at 550 nm, between 1.9 and 2.1. Coated disc according to any one of the preceding Claims, by characterized in that one or more of these layers of non-absorbent Material composite coating layers are. Coated disc according to any one of the preceding Claims, characterized in that the dominant wavelength of the Reflection from the opposite surface between 485 and 505 nm lies. Use of a coated pane of vitreous Material according to any one of claims 1 to 16 in a multiple glazing unit, containing at least two slices of transparent vitreous Material with the surfaces are spaced apart and a gas space in between by a circumferentially extending spacer is limited, characterized in that at least one of these Slice a coated slice of glassy material after any the claims 1 to 16, wherein the coated surface is directed against this gas space. Use according to claim 17, characterized that the purity of the coloring not at reflection perpendicular to the opposite surface more than 8%, preferably not more than 7%.