Glazing

Description of the invention

The present invention relates to glazing panes and a method for manufacturing a glazing pane, and more particularly glazing panes that are intended to be heat treated after the application of a regulating solar filter.

EP 233003A shows a glazing unit having an optical filter coated by sputtering with the structure: glass substrate / basic SnO2 dielectric / first metal barrier of Al, Ti, Zn, Zr or Ta / Ag / second metal barrier of Al, Ti, Zn, Zr or Ta / surface SnO2 dielectric. The purpose of the optical filter is to block a significant portion of the incident radiation in the infrared portion of the spectrum and allow a significant portion of the incident radiation to pass through in the visible portion of the spectrum. In this way, the filter reduces the thermal effect of the incident sunlight, allowing good visibility through the glazed window, and is particularly suitable for windshields.

In this type of structure, the Ag layer reflects the incident infrared radiation. For this to occur, it must be held as metallic silver rather than silver oxide, and should not be significantly contaminated by adjacent layers. The dielectric layers that encase the Ag layer serve to reduce the reflection of the visible spectrum that would otherwise be caused by the Ag layer. The second barrier is to prevent oxidation of the Ag layer during sputtering of the SnO2 dielectric layer, which is on it, in an oxidizing atmosphere. This barrier is at least partially oxidized during the process. The main task of the first barrier is to prevent oxidation of the silver layer during the heat treatment of the coating (e.g. during bending and / or toughening) of the glazing unit by oxidizing it rather than by allowing oxygen to pass through the Ag layer. This oxidation of the barrier during the heat treatment increases the TL of the glazing unit.

EP 792847A discloses a heat treated solar control glazing unit which is based on this principle and has the structure: glass substrate / ZnO dielectric / Zn / Ag barrier / Zn barrier / ZnO dielectric / Zn / Ag barrier / ZnO barrier / ZnO dielectric. The Zn barriers below each Ag layer are designed for complete oxidation during heat treatment. These barriers protect the Ag layers from oxidation. As is well known in the art, a structure having two spaced Ag layers rather than a single Ag layer increases the selectivity of the filter.

EP 275474A discloses a heat treated solar control window having the structure: glass substrate / zinc tin dielectric / Ti barrier / Ag / Ti barrier / zinc tin dielectric. Generally, Ti barriers are preferred in a heat treated structure of this type because of their high affinity for oxygen and the relative ease with which they can be oxidized to form titanium oxide.

The subject of the invention is a glazing pane characterized in that it comprises, in a specific sequence, at least:

- glass substrate,

- a base anti-reflection layer comprising at least a base anti-reflection bottom layer and a base anti-reflection top layer which has a composition different from that of the base anti-reflection bottom layer, the base top anti-reflection layer comprising a mixed Zn oxide and at least one additional X material, wherein the weight ratio X / Zn in the base anti-reflective upper layer is in the range from 0.02 to 0.5, and where X is Sn and optionally one or more materials selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti,

- the first layer that reflects infrared radiation, containing silver,

- the first barrier layer,

a middle antireflection layer comprising at least a middle bottom antireflection layer and a middle top antireflection layer which is of a different composition to the bottom middle antireflection layer, the middle bottom antireflection layer being in direct contact with the first barrier layer and a middle top antireflection layer containing mixed Zn oxide and at least one additional Y material, where the weight ratio Y / Zn in the upper middle antireflection layer is in the range from 0.02 to 0.5 and where Y is Sn and optionally one or more materials selected from the group consisting of Al, Ga, In, Zr, Sb , Bi, Mg, Nb, Ta and Ti,

- a second, infrared reflecting layer containing silver,

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- a second barrier layer, and

- surface anti-reflection layer.

Preferably, the base upper anti-reflection layer is in direct contact with the first infrared reflecting layer.

Preferably, the top middle antireflection layer is in direct contact with the second infrared reflecting layer.

Preferably, the top layers of both the base antireflection layer and the middle antireflection layer have a geometric thickness in the range of about 3 nm to 20 nm.

Preferably, the lower middle anti-reflective layer comprises a mixed Zn oxide and at least one additional W material, the weight ratio W / Zn of the lower middle anti-reflective layer being between 0.5 and 2, and further W is Sn and optionally one or more. than one material selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti.

Preferably the base lower anti-reflective layer comprises a mixed Zn oxide and at least one additional W material, the weight ratio W / Zn of the base anti-reflective layer being between 0.5 and 2, and further W is Sn and optionally one or more than one material selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti.

Preferably, the first barrier layer comprises titanium.

Preferably, the second barrier layer comprises titanium.

Preferably, the anti-reflective surface layer comprises at least one layer that comprises a mixed Zn oxide and at least one additional material W, where W is Sn and optionally one or more materials selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti.

Preferably, the surface antireflection layer comprises at least one layer that comprises a mixed Zn oxide and at least one additional material W, the layer having a W / Zn weight ratio in the range of 0.02 to 0.5, and further W is Sn and optionally one or more materials selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti and which is in direct contact with the second barrier layer.

Preferably, the glazing pane is a heat-treatable glazing pane.

Preferably, the glazing pane is a heat-treated glazing pane without fogging.

Preferably, it comprises a glass substrate on which a coating unit is deposited, the coating unit having the following layers in a specific sequence:

- a base antireflection layer comprising a base lower antireflection layer and a base top antireflection layer which has a composition different from that of the base antireflection bottom layer, the base antireflection layer comprising a mixed Zn and Sn oxide with a Sn / Zn weight ratio ranging from 0.5 to 2, and the base upper anti-reflection layer comprises a mixed Zn and Sn oxide with a Sn / Zn weight ratio in the range of 0.02 to 0.5,

- the first infrared reflecting layer containing metallic silver,

- the first barrier layer,

- a middle antireflection layer comprising a middle lower antireflection layer and a middle top antireflection layer which is of a different composition to the bottom middle antireflection layer, with the middle bottom antireflection layer in direct contact with the first barrier layer and containing a mixed Zn oxide; and Sn with a Sn / Zn weight ratio in the range from 0.5 to 2, and the middle upper anti-reflection layer contains a mixed Zn and Sn oxide with a Sn / Zn weight ratio between 0.02 and 0.5,

- a second infrared reflecting layer containing metallic silver,

- a second barrier layer, and

- surface anti-reflection layer.

The present invention relates to a method for manufacturing a multi-layer glazing unit, which comprises a glazing pane comprising a glass substrate on which a coating unit is deposited, the coating unit having the following layers in a specific sequence:

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- a base anti-reflection layer comprising a base lower anti-reflection layer and a base upper anti-reflection layer which has a composition different from that of the base anti-reflection bottom layer, the base lower anti-reflection layer comprising a Zn and Sn mixed oxide with a Sn / Zn weight ratio ranging from 0.5 to 2, and the base upper anti-reflection layer comprises a mixed Zn and Sn oxide with a Sn / Zn weight ratio in the range of 0.02 to 0.5,

- the first infrared reflecting layer containing metallic silver,

- the first barrier layer,

- a middle antireflection layer comprising a middle lower antireflection layer and a middle top antireflection layer which is of a different composition to the bottom middle antireflection layer, with the middle bottom antireflection layer in direct contact with the first barrier layer and containing a mixed oxide of Zn and Sn with a Sn / Zn weight ratio in the range from 0.5 to 2, and the middle upper anti-reflection layer contains a mixed Zn and Sn oxide with a Sn / Zn weight ratio between 0.02 and 0.5,

- a second infrared reflecting layer containing metallic silver,

- a second barrier layer, and

- a surface anti-reflection layer;

heated and bent at a temperature of at least 570 ° C to the desired shape after deposition of the coating unit.

Furthermore, the invention also relates to a glazing pane, characterized in that it comprises a glass substrate covered with a stacked layer system comprising at least the following layers in a specific sequence:

a base antireflective layer comprising at least a base antireflective lower layer and a base antireflective top layer that has a composition different from that of the base antireflective layer, the base antireflective top layer comprising a mixed Zn oxide and at least one additional component X, wherein the weight ratio X / Zn in the base upper anti-reflection layer is in the range from 0.02 to 0.5, wherein X is Sn and optionally one or more components selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti;

- the first infrared reflecting layer containing silver,

- the first barrier layer,

a middle antireflection layer comprising at least a middle lower antireflection layer and a middle top antireflection layer which is of a different composition to the bottom middle antireflection layer, the middle top antireflection layer comprising a mixed Zn oxide and at least one additional component Y, the weight ratio Y / Zn in the upper middle anti-reflection layer is in the range from 0.02 to 0.5, wherein Y is Sn and optionally one or more components selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti;

- a second infrared reflecting layer containing silver,

- a second barrier layer, and

- a surface antireflection layer; where the glazing glass has at least one of the following characteristics:

(A) the glazing has an emission factor of less than 0.35, (B) the glazing has an electrical resistance of less than 3 ohms per surface, (C) the multi-layer glazing has color axes in the CIElab pattern L * = 40 ± 2.5 a * = -6 ± 2.5 b * = -2 ± 2.5, (D) the multi-layer glazing has a light transmittance TL of at least 75%, (E) the multi-layer glazing shows a color change ΔΕ * on the surface of the glazed window less than 2 (F) the glazing pane shows a haze after heat treatment not exceeding 0.3, (G) the glazing pane shows, during the heat treatment, an increase in light transmittance TL in absolute terms by at least 5%.

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Preferably, it has at least two of said features (A) to (G).

Preferably, it has at least three of said features (A) to (G).

Preferably, it has at least four of said features (A) to (G).

Preferably, it has at least five of said features (A) to (G).

Preferably, it has at least one additional layer provided above, below or in the middle of the tier layer system.

Preferably, it has at least one of the following further features (H) to (R):

(H) the base top anti-reflection layer is in direct contact with the first infrared reflecting layer, (I) the middle top anti-reflection layer is in direct contact with the second infrared reflecting layer (J) the top layer of the base anti-reflection layer has a geometric thickness within the range from 3 nm to 20 nm, (K) the top layer of the middle antireflection layer has a geometric thickness ranging from 3 nm to 20 nm, (L) the middle bottom antireflection layer comprises a mixed Zn oxide and at least one additional W component, the middle W / Zn weight ratio in the middle the lower antireflection layer is in the range of 0.5 to 2, W being Sn and optionally one or more components selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti ;

(M) the primary lower anti-reflective layer comprises a mixed Zn oxide and at least one additional component W, the weight ratio W / Zn in the lower middle anti-reflective layer being between 0.5 and 2, with W being Sn and optionally one or more than one component selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta, and Ti;

(N) the first barrier layer comprises titanium, (O) the second barrier layer comprises titanium, the (P) surface antireflection layer comprises at least one layer which comprises a mixed Zn oxide and at least one additional component W, the weight ratio W / Zn in this layer it is in the range from 0.02 to 0.5, where W is Sn and optionally one or more components selected from the group consisting of Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti and which is in direct contact with the second barrier layer;

(Q) the glazing unit is heat treatable. (R) the glazing shows no haze when heat treated.

Preferably, it comprises a glass substrate on which a stacked layer system is deposited, the stacked layer system having the following layers in a specific sequence:

- a base anti-reflection layer comprising a base lower anti-reflection layer and a base upper anti-reflection layer which has a composition different from that of the base anti-reflection bottom layer, the base anti-reflection layer comprising a mixed oxide of Zn and Sn, with the Sn / Zn weight ratio ranging from 0.5 to 2, and the base top anti-glare layer contains a mixed oxide of Zn and Sn, the Sn / Zn weight ratio being in the range from 0.02 to 0.5;

- the first infrared reflecting layer containing metallic silver,

- the first barrier layer,

a middle antireflection layer comprising a middle lower antireflection layer and a middle top antireflection layer which is of a different composition to the bottom middle antireflection layer, the middle bottom antireflection layer comprising a mixed oxide of Zn and Sn, the weight ratio of Sn / Zn being between 0.5 to 2, and the middle top anti-glare layer contains a mixed oxide of Zn and Sn, the Sn / Zn weight ratio is in the range from 0.02 to 0.5,

- a second infrared reflecting layer containing metallic silver,

- a second barrier layer, and

- a surface antireflection layer; where the glazing glass has at least one of the following characteristics:

(A) the glazing has an emission factor of less than 0.35, (B) the glazing has an electrical resistance of less than 3 ohms to the surface,

(C) the multi-layer glazing has color axes in the CIElab pattern L * = 40 ± 2.5; a * = -6 ± 2.5; b * = -2 ± 2.5, (D) the multi-layer glazing has a light transmittance TL of at least 75%, (E) the multi-layer glazing shows a color change ΔΕ * on the surface of the glazed window of less than 2, (F) the glass pane the glazing unit exhibits a haze of no more than 0.3 after heat treatment, (G) the glazing pane shows, during the heat treatment, an increase in light transmittance TL in absolute terms by at least 5%.

Preferably, it has at least one additional layer provided above, below or in the middle of the stacked layer system.

The coating layers are preferably deposited by sputtering, preferably magnetron sputtering, but other deposition techniques may be used. Different layers of the coating unit may be deposited using different techniques.

The top layers in the base and middle antireflection layers may be of the same or largely the same composition. This may facilitate the use of virtually similar objects for the deposition of these layers and / or of virtually similar deposition conditions.

The combination of the defined top layers in the primary and middle anti-reflective layers as part of the defined coating unit can facilitate the production of glazing panes (and particularly multi-layer vehicle windscreens) having a TL greater than 75% after heat treatment while providing a favorable combination of reproducible heat stability during heat treatment a little haze mechanical and chemical resistance and the desired color in reflection and / or transmittance.

One additional material, or preferably both additional materials, X and Y are preferably Sn and / or Al, which can give a particularly advantageous combination of properties.

The proportion of Zn in the mixed oxide that forms the primary top anti-reflective layer and / or that forms the middle top anti-reflective layer may be such that the weight ratio X / Zn and / or the weight ratio Y / Zn ranges from about 0.03 to 0.3.

Placing one or each of the upper layers in the base anti-reflection layer and / or the middle anti-reflection layer in direct contact with the infrared reflecting layer thereon may also facilitate high TL levels during heat treatment. Alternatively, an additional layer, for example a barrier layer, may be interposed between one or each of the top layers in the base antireflective layer and the middle antireflective layer and the infrared reflecting layer thereon. Such additional barrier may be a layer containing Ti and / or containing Ti oxide. The additional barrier layer may have a geometric thickness of between about 5^.10^-1 nm [5 A] and 6 nm [60 A].

The base top anti-reflection layer and / or middle top anti-reflection layer may have a geometric thickness of less than about 20 nm [200 A], less than about 15 nm [150 A], less than about 13 nm [130 A], or less than about 11 nm [110 A]. This can provide the coating unit with favorable mechanical properties, especially as regards the peel-off resistance.

The base top anti-reflection layer and / or middle top anti-reflection layer can have a geometric thickness greater than about 3 nm [30 A], greater than about 5 nm [50 A], greater than about 10 nm [100 A]. This can provide a sufficient thickness which improves the properties of the coating unit, especially as regards the TL obtained after heat treatment.

The middle, bottom anti-reflective layer may include at least one layer that provides sufficient blocking of the migration of oxygen and / or sodium and / or other materials to prevent significant fouling and / or diffusion of the coating assembly layers. Preferably, the middle, lower anti-reflection layer is in direct contact with the first barrier layer and comprises a material that is resistant to diffusion of the first barrier layer during heat treatment. The combination of the middle lower anti-reflection layer with a first barrier that is deposited at least partially metallic or highly metallic and then oxidized during heat treatment (and particularly with a barrier that when deposited contains or consists primarily of metallic Ti ), can allow the coating unit to have a particularly high thermal stability during the heat treatment. It is believed that the diffusion of material from the first

The barrier layer to the middle anti-reflective lower layer during heat treatment, and particularly during severe heat treatment, may, in certain coating unit systems, be a decisive factor in determining the thermal stability of the coating unit. The composition of the middle anti-reflective layer can significantly reduce this diffusion.

To prevent significant fouling and / or diffusion of the coating assembly layers, the base anti-reflection bottom layer may include at least one layer that provides sufficient blocking of the migration of oxygen and / or sodium and / or other materials. The use of a primary backing anti-reflective layer can facilitate this, further making it easier to establish and control the deposition conditions.

The use of a defined anti-reflection surface layer can facilitate the setting and control of the deposition conditions for the entire coating unit. The layer may further be customized to provide blocking of oxygen migration during the heat treatment and / or diffusion of the second barrier layer.

The surface antireflection layer may comprise at least one layer which comprises a mixed Zn oxide and at least one additional W material, characterized in that the W / Zn weight ratio in this layer is in the range of 0.02 to 0.5, and thereto that W is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti. This may improve the thermal stability of the coating unit during the heat treatment and / or its chemical and / or mechanical resistance.

The invention may provide an advantageous combination of properties for a glazed window, for example:

• particularly good TL levels after heat treatment, • particularly good thermal stability during heating of the glazing unit, for example during toughening and / or bending. This can facilitate bending of coated glazing panes, particularly to produce complex shapes, without causing unacceptable color variations to the surface of the glazing pane. The lack of thermal stability of the coating assembly after subjecting it to the conditions necessary for bending and / or toughening the glass substrate can cause color changes during the heat treatment. This aspect can be improved especially by the use of a middle lower anti-reflection layer to inhibit the significant diffusion of the first barrier layer. Ease and controllability of the deposition: the anti-reflective layers according to the present invention can be deposited more easily and in a more controlled manner than, for example, Al2O3 or SiO2. Although Al2O3 and SiO2 exhibit a good degree of heat stability, they are difficult to deposit using conventional sputtering techniques. Good mechanical resistance: anti-reflective layers can be used without compromising the mechanical resistance of the coating. They can perform particularly well in tests using a compactor when glazing is used in the multilayer structure.

• Ag compatibility: crystallization of the Ag layer influences its optical properties. The pure ZnO layer adhering to the Ag can lead to excessive Ag crystallization and haze problems in the coating, especially during heat treatment. However, when the anti-reflective layer is not composed of ZnO, recrystallization of the Ag layers may be insufficient, resulting in the level of infrared radiation reflection and the level of electrical conductivity in the coating below the achievable optimum. The present invention can be used to aid crystallization to an extent sufficient to provide good IR reflectivity while avoiding excessive haze. In particular, it can provide an advantageous crystallization compared to an anti-reflective layer consisting of TiO2 or SnO2. Perhaps the explanation for this is that the presence of additional X or Y material in the zinc oxide structure can reduce crystal grain growth in the mixed oxide layer, especially perpendicular to the substrate. This may result in a less crystalline, more amorphous, diffusion-reducing structure that would otherwise likely appear within the crystal grain boundaries.

• manufacturing cycle time: an oxide layer, which is a mixture of Zn and at least one of the specified additional materials, may have a refractive index higher than anti-reflective layers with, for example, ZnO and SnO2, typically used in similar structures, and yet will deposit faster than known anti-reflective layers having relatively high refractive indices, e.g., TiO2. Consequently, this may allow the production cycle time to be improved.

• good selectivity: a higher refractive index may furthermore facilitate an increase in the selectivity of the coating unit, • a low emission factor, especially an emission factor lower than 0.35, preferably lower than 0.32 or lower than 0.30, especially after treatment thermal.

• low electrical resistance, especially surface resistance, less than 3 ohms per surface, preferably less than 2.8, 2.5 or 2.3 ohms per surface, especially after heat treatment.

Particularly advantageous properties can be obtained if the additional material X or Y consists of • mainly Sn, • Sn with one or more additional material from a specific group of materials, for example, Ti and Al, • mainly Al, • Al with with one or more additional materials from a particular group of materials.

The present invention can be particularly advantageous as it facilitates the production of multi-layer windshields for vehicles or other glazed windows having CIElab color axes L * = 40 ± 2.5; a * = -6 ± 2.5; b * = -2 ± 2.5. While known coating units can make it possible to manufacture such vehicle windshields, especially for simple models that do not require harsh heating conditions to provide the desired configurations after bending, the present invention, by proposing a coating unit that is particularly stable during the heat treatment of a glazing unit. can allow for the production of more complex bent molds and / or can provide significantly better industrial performance with fewer scrap products and / or can allow for less complicated bending methods and / or can ensure that such characteristics can be obtained in industrially manufactured glazed windows continuously while still providing a TL of at least 75%, and indeed a TL which may be 75% or more.

Likewise, the present invention may facilitate the production of multi-layer windshields for vehicles or other glazed windows in which the color change ∆Ε * on the glazed window surface is less than 2, preferably less than 1.5 or 1.2 and more preferably less than 1 when the color change ∆E * is calculated as:

ΔE * = ^ (L *² + a *² + b *²), where L * a * and b * are measured in the CIElab system.

The color change in the surface of the vehicle windshield depends on the complexity of the vehicle windshield, the method of heating and the conditions used to bend the glazing unit, and the thermal stability of the coating unit to such color changes. While prior art coating systems may allow similar low levels of color change to be achieved particularly with straight vehicle windshields or under certain heating conditions or with certain levels of non-compliance rejection, the present invention can be used to facilitate the industrial manufacture of such vehicle windshields under much more favorable industrial conditions. .

The term "heat-treated glazing glass pane as used herein means that the glazing pane having a coating unit is capable of bending and / or thermal toughening and / or thermal curing operations and has no haze of the glazing unit so treated exceeding 0.5, and preferably" there is no haze exceeding 0.3. The term "glazing unit heat treated to a large extent without fogging as used herein means a glazing unit that has been bent and / or thermally toughened and / or thermally toughened and has a haze not exceeding 0.5, and preferably not exceeding 0.3." The invention can be particularly advantageous as it facilitates a production wherein the coating unit is deposited onto an actually even or flat glass substrate to produce a glazing unit which can then be heat treated, for example bent or toughened.

The filter assembly may include one or more barrier layers underneath and / or on the infrared reflecting layer as is known in the art. Barriers may be used, for example, of one or more of the following materials: Ti, Zn, Cr, "stainless steel, Zr, Ni, NiCr, ZnTi, NiTi, and ZnAl." Such barriers can be deposited, for example, as metallic layers or suboxides (ie partially oxidized layers). Alternatively, nitrided barrier layers can also be used. The barrier layers in such coating units can serve to prevent the infrared reflecting layers from degrading to unacceptable levels during the deposition of the layers that will come on them and / or during the heat treatment of the coating unit.

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One or more such barrier may comprise the same materials as the mixed oxide layer, particularly an adjacent mixed oxide layer. This may facilitate the achievement of the objectives and the control of the deposition conditions, and in the latter case may ensure good adhesion between the layers and therefore good mechanical durability of the coating assembly.

The heat treatment may increase the TL of the glazing unit. Such an increase in TL may be advantageous in terms of providing a sufficiently large TL for a glazing unit used in a vehicle windshield. TL may increase in absolute terms during heat treatment by, for example, about 2.5%, more than about 3%, more than about 5%, more than about 8%, or more than about 10%.

An example of the present invention will now be shown in connection with Fig. 1, which is a cross section of a glazing unit prior to the bending and toughening operation (for ease of presentation, the relative thickness of the glazing and coating layers is not shown on the scale).

Example 1

Figure 1 shows a heat treated Ag double layer coating layer deposited on an essentially flat or flat glass substrate by magnetron sputtering and having the following structure:

<td></td><td>Number layers</td><td>Geometric thickness</td><td>Ratio weight Sn / Zn</td>

<td>Glass substrate</td><td> 10</td><td>2Ί0³ m [2 mm]</td><td></td>

<td>Basic anti-glare layer containing:</td><td> 11</td><td rowspan="2">20 nm [200 A]</td><td></td>

<td>the lower layer of ZnSnOx</td><td> 12</td><td> 0,7</td>

<td>the upper layer of ZnSnOx</td><td> 13</td><td>10 nm [100 A]</td><td> 0,17</td>

<td>Ag</td><td> 14</td><td>10 nm [100 A]</td><td></td>

<td>Barrier overlying Ti</td><td> 15</td><td>4 nm [40 A]</td><td></td>

<td>Middle anti-glare layer containing:</td><td> 16</td><td rowspan="2">65 nm [650 A]</td><td></td>

<td>middle bottom layer of ZnSnOx</td><td> 17</td><td> 0,7</td>

<td>the upper layer of ZnSnOx</td><td> 18</td><td>10 nm [100 A]</td><td> 0,17</td>

<td>Ag</td><td> 19</td><td>10 nm [100 A]</td><td></td>

<td>Barrier overlying Ti</td><td> 20</td><td>4 nm [40 A]</td><td></td>

<td>A surface anti-reflection layer containing:</td><td> 21</td><td rowspan="2">8 nm [80 A]</td><td></td>

<td>the lower layer of ZnSnOx</td><td> 22</td><td> 0,7</td>

<td>the upper layer of ZnSnOx</td><td> 23</td><td>14 nm [140 A]</td><td> 0,17</td>

<td>Protective sheath made of Ti</td><td> 24</td><td>3 nm [30 A]</td><td></td>

wherein ZnSnOx is a mixed oxide containing Zn and Sn deposited in this example by reactive sputtering of an object which is an alloy or mixture of Zn and Sn in the presence of oxygen.

Alternatively, the mixed oxide layer may be formed by sputtering an object that is a mixture of zinc oxide and an oxide of an additional material, particularly in an argon gas or argon-enriched oxygen-containing atmosphere.

To deposit a barrier that is not completely oxidized, the Ti barriers are deposited by sputtering a Ti object that is in an argon-enriched oxygen-containing atmosphere.

The oxidation state in each of the base, middle, and surface ZnSnOx dielectric layers need not necessarily be the same. Likewise, the oxidation state in each of the Ti barriers need not be the same.

Each barrier on the silver layer protects the layer of silver beneath it from oxidation during the sputter deposition of the ZnSnOx layer that will be on the barrier. Although further oxidation may occur during the deposition of the oxide layers which will end up on the barrier layers, some of the barriers preferably remain in the form of

A metal or oxide form that is not completely oxidized, which provides a barrier to and during further heat treatment of the glazing unit.

This specific glazing pane is intended to be incorporated into a multi-layer windscreen of a vehicle and has the following properties:

<td>Property</td><td>Before heat treatment, see Note 1 below</td><td>After heat treatment, see Note 2 below</td>

<td>TL (Illuminating factor A)</td><td> 63%</td><td> 76%</td>

<td>TE (Moon 2 System)</td><td> 38%</td><td> 42%</td>

<td>Haze</td><td> 0,1</td><td> 0,25</td>

<td>and*</td><td>-10 (glass side)</td><td>-6 (external)</td>

<td>b *</td><td>+ 10 (glass side)</td><td>-3 (external)</td>

<td>RE (Moon 2 System)</td><td>29% (glass side)</td><td>32% (external)</td>

Note 1: Measured for a monolithic glazing unit with a coating before heat treatment

Note 2: Measured after heat treatment at 650 ° C during 10 minutes followed by bending, toughening and layering, with clear glass sheet 2^. 10^-3 m [2 mm] and clear pvb 7.6^. 10^-4 m [0.76 mm]

The heat treatment preferably causes virtually complete oxidation of all barrier layers and the protective mantle.

The color axes of the example are particularly suitable for car windshields because they give a neutral or slightly blue or slightly green appearance in reflection when the windshield is mounted at an angle to the body. For other applications, e.g. architectural applications, the color in reflection may be adjusted, as is known in the art, by adjusting the thickness of the dielectric layers and / or the layer (s) reflecting (reflecting) the infrared radiation.

If necessary, additional layers may be provided above, below or in the center of the stacked layers without prejudice to the spirit of the invention.

In addition to the favorable optical properties that can be obtained, the example provides a coating layer that can be electrically heated, for example, in an electrically heated car windshield to provide a demisting and / or defrosting function , using appropriately positioned electrical connectors.

The TL of the glazing unit can be customized to suit the desired application. E.g.

• if the glazing is to be used as a windshield for a vehicle in the European market, a TL greater than 75% can be selected (as required by European regulations).

• if the glazing unit is to be used as a windshield for a vehicle in the US market, a TL greater than 70% may be selected (as required by US regulations).

• if the glazing is to be used as a front side light of the vehicle, the TL can be adjusted to a value greater than 70% (as required by European regulations), • if the glazing is to be used as a rear side light of the vehicle or a rear window for the vehicle, TL can be selected such that the value is between about 30% and 70%.

Such TL adjustment can be achieved, for example, by adjusting the thickness of the layers of the coating unit, especially the thickness of the dielectric layers and / or the infrared reflecting (reflecting) layer (s).

• by combining the coating unit with a colored glass substrate, for example to increase selectivity.

• by combining the coating unit with a colored pvb and another layer forming a delamination.

A possible way to determine the composition of the coating unit is to use the secondary ion mass spectroscopy method. This method relies on ion bombardment of the coating unit by analyzing, particularly by mass analysis, the material ejected from the coating unit. Such analysis can be used to provide an indication of the composition and thickness of the layers of the coating unit.

PL 200 326 B1

In this description, unless the context requires otherwise, the following terms have the following meanings:

<td>and*</td><td></td><td>color axis measured in the CIElab system under normal incidence</td>

<td>Ag</td><td>silver</td><td></td>

<td>Al</td><td>aluminum</td><td></td>

<td>Al2O3</td><td>alumina</td><td></td>

<td>b *</td><td></td><td>color axis measured in the CIElab system under normal incidence</td>

<td>Bi</td><td>bismuth</td><td></td>

<td>Cr</td><td>chrome</td><td></td>

<td>Ga</td><td>gal</td><td></td>

<td>factor emissions</td><td></td><td>the emission factor of a given surface at a given temperature is defined as the ratio of the energy emitted by the surface to the energy of a perfect emitter (black body emission factor = 1.0) at the same temperature. For the glazed windows in question, the emission factor is often measured at 25 ° C on the coated side of the substrate.</td>

<td>haze</td><td></td><td>Percentage of transmitted light which, when passing through the sample, deviates from the incident beam due to earlier scattering, measured according to determination AsTM D 1003-61 (Reapproved 1988)</td>

<td>In</td><td>indium</td><td></td>

<td>material reflecting infrared radiation</td><td></td><td>a material that has a reflectance greater than that of the soda-lime glass in the wavelength range between 780 nm and 50 micrometers</td>

<td>Mg</td><td>magnesium</td><td></td>

<td>On</td><td>sodium</td><td></td>

<td>Nb</td><td>niobium</td><td></td>

<td>Ni</td><td>nickel</td><td></td>

<td>RE</td><td>Reflection energetic</td><td>solar radiation flux (light or non-light) reflected from the ground as a percentage of the incident solar radiation flux</td>

<td>Sat</td><td>antimony</td><td></td>

<td>selectivity</td><td></td><td>ratio of light transmittance to solar radiation coefficient ie TL / TE</td>

<td>SiO2</td><td>silicon oxide</td><td></td>

<td>SnO₂</td><td>tin oxide</td><td></td>

<td>Yeah</td><td>tantalum</td><td></td>

<td>THESE</td><td>permeable nity energetic</td><td>solar radiation flux (light or non-light) transmitted through the substrate as a percentage of the incident solar radiation flux</td>

<td>Ti</td><td>titanium</td><td></td>

<td>TL</td><td>light transmittance</td><td>luminous flux transmitted through the substrate as a percentage of the incident luminous flux</td>

<td>Zn</td><td>zinc</td><td></td>

<td>ZnO</td><td>zinc oxide</td><td></td>

<td>Zr</td><td>zirconium</td><td></td>

PL 200 326 B1

The combination of anti-reflective layers in the coating unit serves to reduce the overall reflection of the coating unit in the visible portion of the spectrum, as will be known to those skilled in the art. The composition and thickness of each anti-reflection layer can be selected accordingly.