Glass composition, glass article and method for producing same

Abstract

The present disclosure relates to glass and glass articles. The glass articles include flat glass suitable for use in display devices such as electronic devices including smartphones, smart watches, and tablet computers. Methods of making the glass articles are also described.

Description

[Technical field]

[0001] The present disclosure relates to glass and glass articles. The glass articles include flat glass suitable for use in display devices such as electronic devices including smartphones, smart watches, and tablet computers. Methods of making the glass articles are also described.

[0002] Background technology Foldable display devices, such as smartphones and tablet computers, are becoming increasingly popular. Foldable devices combine the advantages of a large screen when unfolded with the advantages of a portable size when folded. For glass sheets to be usable in such foldable display devices, the glass sheets must be very thin. Very thin glass is prone to breaking. Also, such glass must be strong enough to withstand repeated folding and unfolding operations.

[0003] Aluminosilicate glass is commonly used in portable electronic devices. Aluminosilicate glass has certain properties that make it suitable for use as display glass. These properties include the ability to be manufactured with very small thicknesses. For a display cover glass to be flexible or foldable, its thickness must be very small, for example less than 100 μm or even less than 30 μm. The smaller the thickness, the lower the impact resistance. As a result, measures must be taken to strengthen the glass. Some prior art glasses, although temperable, lack chemical resistance.

[0004] It would be advantageous to have a glass that overcomes the shortcomings of the prior art.

[0005] Detailed Description In a first aspect, the present disclosure provides a method for treating a cancer cell comprising: i. SiO2, ii. Al2O3 and / or B2O3 in a total amount of 5.0 to 25.0 wt. %; ii. ZrO2 and / or Y2O3 in a total amount of at least 3.0 wt. %; iii. 10.0 to 40.0 wt. % in total of one or more oxides selected from ZnO, Li2O, Na2O, KO, MgO, CaO, SrO, BaO, and combinations thereof; and iv. Optionally, one or more components selected from P2O5 and TiO2. The present invention relates to a glass comprising:

[0006] In a second aspect, the present disclosure provides a composition comprising the following components, in weight percent: [Table 1] where R2O is the sum of the amounts of alkali metal oxides and R'O is the sum of the amounts of all alkaline earth metal oxides.

[0007] The inventors have found that the glasses according to the first and second aspects offer a novel combination of desirable properties. The glasses are remarkably easy to chemically strengthen. That is, when immersed in a salt bath for chemical strengthening, the glasses build up high compressive stresses on their surface in a very short time. In one embodiment, this susceptibility to compressive stresses is 800 MPa, or even 1000 MPa, within 30 minutes after chemical strengthening. Despite this significant susceptibility to compressive stresses, the glasses exhibit only moderate thermal expansion, such as a thermal expansion coefficient of less than 8.8 ppm / K, or even less than 8.0 ppm / K. This moderate thermal expansion allows the manufacture of articles with good dimensional properties. During the manufacture of thin glass, for example in the downdraw process, the glass is cooled rapidly. In general, the cooling rate is not exactly the same in all parts of the glass. This leads to warping of the glass article. The warping is greater for articles manufactured with glasses having a higher thermal expansion coefficient. The low coefficient of thermal expansion of the glasses of the present disclosure allows for the production of glass articles that are particularly prone to warping.

[0008] Additionally, the glasses of the present disclosure have excellent chemical resistance, which is very useful in glasses for display applications. Prior art glasses that have significant chemical strengthening properties generally have not exhibited very good or poor chemical resistance.

[0009] In a third aspect, the present disclosure relates to a glass article comprising or consisting of the glass described herein.

[0010] In a fourth aspect, the present disclosure relates to a glass article comprising or consisting of the glass described herein, the glass article including an ion-exchange layer on one or both of its major surfaces.

[0011] In a fifth aspect, the present disclosure relates to an electronic device comprising the glass or glass article described herein.

[0012] In a sixth aspect, the present disclosure relates to a method for making a glass or glass article of the present disclosure.

[0013] definition Thermal expansion coefficient ( C coefficient of t hermal e Coefficient of linear thermal expansion ("CTE") is the average value of the coefficient of linear thermal expansion over the temperature range 20 to 300° C. It is determined in accordance with DIN ISO 7991:1987.

[0014] Ease of compressive stress ( C ompressive s TRES sThe Compressive Stress Score (CSS) is given in MPa. It is the measure of compressive stress measured on a specimen of glass under specific test conditions. In this test, the specimen can be in the form of a 200 μm or 30 μm thick sheet. The specimen is subjected to an ion exchange treatment in an alkali metal nitrate bath (100%) for 30 or 15 minutes. The temperature can be selected to obtain the highest chemical stress. The alkali metal nitrate depends on the type of ion exchange treatment to be performed, i.e., which ions need to be exchanged. Optionally, the alkali metal nitrate is KNO3 and the bath temperature is 440°C. The use of a 200 μm or 30 μm thick sheet in the form of a sheet for measuring the CSS does not mean that it is limited to a thin glass article, or even a sheet of that thickness. Instead, CSS is a property of the glass material that is measured on a sheet manufactured from the glass. Although CSS is affected by the thermal history of the glass, CSS is a characteristic of the glass material or glass article. It should be noted that CSS is a characteristic of a material or article that is not reinforced, i.e., that is not ion-exchange treated. Each thickness that involves a CSS value is CSS 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0 30μm These are indicated by subscripts, such as:

[0015] "1000MPa IOX time" is the ion exchange treatment time required to build up a compressive stress of at least 1000MPa on the surface of the glass. The corresponding experiment is the same as the CSS measurement, i.e. the test piece is a 200μm thick plate glass immersed in an alkaline nitrate bath. The temperature can be selected as 380°C for sodium nitrate bath and 440°C for other alkaline nitrate baths. "1000MPa IOX time" is reached when the compressive stress of the test piece is at least 1000MPa.

[0016] Compressive stress (CS) is the compression of the glass network induced after ion exchange at the glass surface layer. CS usually decreases from a maximum value at the surface of the glass layer (surface CS) toward the inside of the glass layer. As is customary in the art, the indication of CS in this disclosure is with respect to the maximum value at each surface. Commercially available testing machines such as FSM6000LE (Orihara Seisakusho) or SLP1000 (Orihara Seisakusho, Japan) can be used to measure CS.

[0017] The depth of layer (DoL) is the thickness of the layer at the surface of the glass article where CS exists, which essentially corresponds to the thickness of the ion-exchange layer. A commercially available tester such as FSM6000 (Lukeo Co., Ltd., Tokyo, Japan) can be used to measure the DoL by a waveguide mechanism.

[0018] “Diffusivity” (D(μm 2 The diffusion coefficient (D) (μm / h) is a material property of glass that describes the ability to build up an ion-exchange layer during chemical strengthening / ion exchange. This property can be calculated by examining the depth of the ion-exchange layer (DoL (μm)) during ion exchange after a certain ion-exchange time (IET (h)). The higher the diffusion coefficient, the deeper the DoL after a given ion-exchange time. The corresponding formula is D=DoL 2 / (7.84×IET). In this disclosure, unless otherwise indicated, all indications of D refer to chemical strengthening with alkali metal nitrate (100%) for 30 minutes, and for small glass thicknesses the chemical strengthening time can be reduced, for example to 15 minutes. The temperature can be selected to be 380°C for sodium nitrate baths and 440°C for other alkali nitrate baths. The alkali nitrates are the nitrates of the alkali metal ions with the next largest diameter compared to the alkali metal oxide most abundant in the glass composition. The diameters of the alkali metal ions are Cs>K>Na>Li, and for example, if the alkali metal oxide most abundant in the glass is sodium, D is indicated for ion exchange with 100% KNO3 at 440°C for 30 minutes.

[0019] Central Tension (CT): When a CS is induced on one or both sides of a glass sheet, to balance the stresses according to the third law of motion, a tensile stress must be induced in the central region of the glass, which is called the central tension. CT can be calculated from the measured CS and DoL.

[0020] As used herein, "surface roughness" refers to the average roughness R, which is a measure of the texture of a surface. a Generally, the amplitude parameter characterizes a surface based on the vertical deviation of the roughness profile from the mean line. R a is the arithmetic mean of the absolute values ​​of these vertical deviations, which can be determined in accordance with DIN EN ISO 4287:2010-07.

[0021] Warpage is the difference between the maximum and minimum distances of the midplane of a free, unclamped glass article from a reference plane. Warpage can be measured as described in SEMI MF1390.

[0022] Total thickness variation ( t otal t Hickness v Total thickness variation (TTV) is the difference between the maximum and minimum thickness of a glass article. It can be measured as described in SEMI MF1530.

[0023] "Hydrolysis resistance" refers to the extracted Na2O equivalent. It is determined according to ISO 719:2020-09. It is a measure of the extractability of basic compounds from the glass in water at 98°C. The result is μg of extracted Na2O equivalent per gram of glass.

[0024] "Alkaline resistance" is the resistance of glass to attack by alkali. It is determined using boiling aqueous solutions of sodium carbonate and sodium hydroxide in accordance with ISO 695:1991-05. The test is performed as described in Section 6.2 "Glass as a material". The results are reported as the mass loss per unit surface area of ​​the glass sample (mg / dm 2 ).

[0025] "Acid resistance" is the resistance of the glass to attack by acids. It is determined using boiling aqueous hydrochloric acid according to DIN 12116:2001-03. The test is carried out as described in section 6.3 "Glass as a material". The results are reported as the mass loss per unit surface area of ​​the glass sample (mg / dm 2 ).

[0026] "T4" means that the glass is 10 4 T4 is the temperature at which the glass has a viscosity of 100 dPas. T4 can be measured by methods known to those skilled in the art for measuring the viscosity of glasses, for example according to ISO 7884-2:1987-12. 13 " means that the glass is 10 13 is the temperature at which the liquid has a viscosity of 100 dPas. n The other temperatures indicated are those at which the glass is heated to 10 n For example, "T5" is the temperature at which the glass has a viscosity of 10 5 This is the temperature at which the liquid has a viscosity of 100 dPas.

[0027] Three-point bending strength is a test of the bending strength of a material. It can be determined by the method described in ASTM C1161-13. An exemplary test setup is as follows: cylindrical steel bearing with a radius of 2 mm; support span of 16 mm; size 28 x 28 x 0.2 mm. 3 Test specimen; prepared according to standard procedure 7.2.4; loading speed 5 mm / min.

[0028] Vickers hardness was measured using a standard Vickers indenter as specified in ASTM C 1327 (2015). The following parameters were used:n (max)=1N; Approximate speed = 4μm / min; Loading speed 2N / min; Holding time 20s; Release speed 6N / min.

[0029] Usually, the Vogel-Fulcher-Tammann (VFT) equation is used to calculate the temperature required to achieve a certain viscosity of a glass (see the ISO 7884 series of standards, e.g. ISO 7884-1:1987-12, 7884-2:1987-12; 7884-3:1987-12; 7884-4:1987-12): lgη=A+B / (T-T0).

[0030] In the VFT equation, η is the viscosity, A and B are material parameters, T is temperature, and T0 is the Vogel temperature. A, B, and T0 are constants for any particular glass. By showing these constants, more detailed information can be obtained about the viscosity behavior of a particular glass composition.

[0031] The "major surfaces" of an article are the two surfaces having the largest area among all surfaces of the article.

[0032] Compositional aspects In this disclosure, the alkali metal oxides R2O include oxides of lithium, sodium, potassium, and cesium. The alkaline earth metal oxides R'O include oxides of magnesium, calcium, strontium, and barium. In some embodiments, the glass does not include cesium, strontium, and / or barium.

[0033] The glasses of the present disclosure include: i. SiO2, ii. Al2O3 and / or B2O3 in a total amount of 5.0 to 25.0 wt. %; ii. ZrO2 and / or Y2O3 in a total amount of at least 3.0 wt. %; iii. 10.0 to 40.0 wt. % in total of one or more oxides selected from ZnO, Li2O, Na2O, KO, MgO, CaO, SrO, BaO, and combinations thereof; and iv. Optionally, one or more components selected from P2O5 and TiO2. may include.

[0034] Optionally, the glass contains the following components in weight percent: [Table 2] where R2O is the sum of the amounts of alkali metal oxides and R'O is the sum of the amounts of all alkaline earth metal oxides.

[0035] In embodiments, the glass has a combined amount of alkali metal oxides, alkaline earth metal oxides, and ZnO of 27.0 wt.% or less, 25.0 wt.% or less, 23.0 wt.% or less, or 20.0 wt.% or less. Optionally, the combined amount of RO+RO+ZnO is at least 10.0 wt.%, at least 12.0 wt.%, or at least 14.0 wt.%. In embodiments, the combined amount is in the range of up to 19.5 wt.%, up to 19.0 wt.%, or up to 18.0 wt.%. For example, the combined amount of RO+RO+ZnO is 10.0-27.0 wt.%, 12.0-25.0 wt.%, 12.0-23.0 wt.%, or 14.0-19.5 wt.%.

[0036] In embodiments, the glass has a combined amount of alkaline earth metal oxides and ZnO of 15.0 wt.% or less, 14.0 wt.% or less, 13.0 wt.% or less, 12.0 wt.% or less, 11.0 wt.% or less, 10.0 wt.% or less, 9.0 wt.% or less, 8.0 wt.% or less, 7.0 wt.% or less, or 6.0 wt.% or less. Optionally, the combined R'O+ZnO is at least 0.1 wt.%, at least 0.2 wt.%, at least 0.5 wt.%, at least 1.0 wt.%, or at least 2.0 wt.%. For example, the total R'O+ZnO is 0 to 15.0 wt%, 0 to 14.0 wt%, 0 to 13.0 wt%, 0 to 12.0 wt%, 0 to 11.0 wt%, 0.1 to 10.0 wt%, 0.2 to 9.0 wt%, 0.5 to 8.0 wt%, 1.0 to 7.0 wt%, or 2.0 to 6.0 wt%.

[0037] The glass may include one or more alkali metal oxides. Optionally, the ratio of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A in weight percent is less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. The "most abundant" alkali metal oxide is the alkali metal oxide that has the highest proportion based on weight percentage in the glass. Thus, the "second most abundant" is the alkali metal oxide that has the second highest proportion based on weight percentage, and so on. In one embodiment, A is Na2O and B is KO, and in an alternative embodiment, B is Na2O and A is KO. In some embodiments, the ratio can be 0.10 or less, 0.08 or less, or even 0.04 or less. In some cases, the ratio can be 0.

[0038] In one embodiment, the ratio of the weight of KO to the sum of the weights of LiO and NaO in the glass composition is less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. In some embodiments, the ratio can be 0.10 or less, 0.08 or less, or even 0.04 or less. In some cases, the ratio can be zero.

[0039] In alternative embodiments, the ratio of the weight of Na2O to the sum of the weights of Li2O and KO is less than 0.23, less than 0.22, less than 0.18, less than 0.16, less than 0.12, or less than 0.10. In some embodiments, the ratio can be 0.10 or less, 0.08 or less, or even 0.04 or less. In some cases, the ratio can be zero.

[0040] In one embodiment, the ratio of the weight of SiO2 to the sum of the weights of Li2O and Na2O in the glass is less than 5.5, optionally less than 4.9, or less than 4.5. Optionally, the ratio can be at least 2.0, at least 3.0, or at least 3.5. For example, the ratio can be in the range of 2.0 to 5.5, 3.0 to 4.9, or 3.5 to 4.5. The inventors have found that this ratio has a positive effect on the thermal expansion and CSS properties of the glass.

[0041] In embodiments, the ratio of the content, in weight percent, of (a) the second most abundant alkali metal oxide to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is between 0.0 and 0.4, between 0.0 and 0.3, or between 0.0 and 0.2, which helps achieve a desired CSS of the glass.

[0042] The glass includes SiO2, optionally in an amount of at least 50.0 wt%, at least 51.0 wt%, at least 53.0 wt%, at least 55.0 wt%, or at least 57.0 wt%. In embodiments, the SiO2 content is up to 70.0 wt%, up to 68.0 wt%, up to 66.0 wt%, or up to 64.0 wt%. In some embodiments, the relative amount of this component is 50.0-70.0 wt%, 51.0-68.0 wt%, 53.0-66.0 wt%, or 55.0-64.0 wt%. SiO2 helps to achieve the desired thermal expansion behavior and chemical resistance.

[0043] Al2O3 can be used to help achieve the desired ease of chemical strengthening. Optionally, the amount of this component is at least 2.0 wt%, at least 3.0 wt%, at least 4.0 wt%, at least 5.0 wt%, at least 6.0 wt%, at least 7.0 wt%, at least 8.0 wt%, or at least 9.0 wt%. In embodiments, the Al2O3 content can be limited to a maximum of 18.0 wt%, a maximum of 17.0 wt%, a maximum of 16.0 wt%, a maximum of 15.0 wt%, a maximum of 14.0 wt%, a maximum of 13.0 wt%, or a maximum of 12.0 wt%. For example, the content of this oxide can be in the range of 0.0 to 18.0 weight%, 2.0 to 17.0 weight%, 3.0 to 17.0 weight%, 4.0 to 16.0 weight%, 5.0 to 16.0 weight%, 6.0 to 15.0 weight%, 7.0 to 14.0 weight%, 8.0 to 13.0 weight%, or 9.0 to 12.0 weight%.

[0044] The glass may contain B2O3 in a proportion of up to 12.0 wt%, up to 11.0 wt%, or up to 10.0 wt%. In some embodiments, the content of this component is as low as 8.0 wt% or less, 5.0 wt% or less, or even 3.0 wt% or less. Some embodiments contain less than 0.1 wt% B2O3. When present, B2O3 helps to balance the devitrification tendency that may result from the use of ZrO2. Optionally, the content of B2O3 ranges from 0 to 12.0 wt%, 0 to 11.0 wt%, or 0 to 10.0 wt%. In some embodiments, B2O3 is used in an amount of at least 1.0 wt%, or at least 2.0 wt%.

[0045] The glass may contain Al2O3 and / or B2O3 in a total amount of 5.0-25.0 wt%, optionally 7.0-22.0 wt%, 8.5-20.5 wt%, or 10.0-17.0 wt%. In an embodiment, the sum of the Al2O3 and B2O3 contents is less than 20.5 wt%, less than 19.5 wt%, less than 18.0 wt%, less than 17.0 wt%, or less than 16.0 wt%. Optionally, the sum of the Al2O3 and B2O3 contents is at least 5.0 wt%, at least 7.0 wt%, at least 8.5 wt%, at least 10.0 wt%, or at least 10.5 wt%.

[0046] P2O5 is an optional component. It may be used in a proportion of at least 0.5 wt%, at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%. Suitable upper limits are 8.0 wt%, 7.0 wt%, 6.0 wt%, and 5.0 wt%. Optionally, P2O5 may be used in the ranges of 0-8.0 wt%, 1.0-7.0 wt%, 2.0-6.0 wt%, or 3.0-5.0 wt%.

[0047] Some embodiments include TiO2 as a glass component, which can be used in amounts of 0-3.0 wt%, 0-2.0 wt%, 0-1.0 wt%, or less than 100 ppm.

[0048] ZrO2 is an important component in the glass composition. It has been found that at least one of ZrO2 and Y2O3 must be present to achieve the desired CSS properties. Desirably, the amount of ZrO2 is at least 3.0 wt%, at least 3.5 wt%, at least 4.0 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.1 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.8 wt%, or at least 7.5 wt%. In embodiments, the amount of this component ranges up to 15.0 wt%, up to 14.0 wt%, or up to 13.5 wt%. Optionally, the content of ZrO2 in the glass can be in the range of 3.0-15.0 wt%, 3.5-15.0 wt%, 4.0-15.0 wt%, 4.5-15.0 wt%, 5.0-14.0 wt%, 5.1-14.0 wt%, 5.5-14.0 wt%, 6.8-13.0 wt%, or 7.5-12.5 wt%. In one embodiment, the amount of ZrO2 is at least 4.5 wt%, at least 5.1 wt%, or at least 6.0 wt%. In some embodiments, the amount of ZrO2 can be at least 8.0 wt%, at least 9.0 wt%, or >10.0 wt%, for example at least 10.1 wt%. Thus, in one embodiment, the amount of ZrO2 can be in the range of 10.1-15.0 wt%.

[0049] The amount of Y2O3 can be at least 5.0 wt%, at least 6.0 wt%, at least 7.0 wt%, or at least 8.5 wt%. In embodiments, the amount of this component ranges up to 20.0 wt%, up to 15.0 wt%, up to 10.0 wt%, or up to 5.0 wt%. Optionally, the content of Y2O3 in the glass can range from 0.0 to 20.0 wt%, 0.0 to 15.0 wt%, 0.0 to 10.0 wt%, or 0.0 to 5.0 wt%.

[0050] ZrO2 and / or Y2O3 may be present in a total amount of at least 3.0 wt%, at least 5.0 wt%, at least 6.0 wt%, or at least 6.5 wt%. In an embodiment, the total amount of these components ranges up to 21.0 wt%, up to 19.5 wt%, or up to 19.0 wt%. Optionally, the total content of ZrO2 and / or Y2O3 in the glass can range from 3.0 to 21.0 wt%, 5.0 to 21.0 wt%, 6.0 to 21.0 wt%, or 6.5 to 19.5 wt%. In an embodiment, the total content of ZrO2 and / or Y2O3 can be at least 8.0 wt%, at least 9.0 wt%, or at least 10.1 wt%. Thus, in an embodiment, the total amount of these components can range from 10.1 to 15.0 wt%.

[0051] In some embodiments, the ratio of the sum of the (a) ZrO2 and Y2O3 contents in weight percent to the (b) SiO2 content in weight percent is 0.08 to 0.40, 0.10 to 0.35, or 0.19 to 0.25. In an embodiment, the ratio is at least 0.08, at least 0.10, at least 0.15, or at least 0.19. The ratio can be in the range of up to 0.40, up to 0.38, up to 0.35, up to 0.30, or up to 0.25.

[0052] Optionally, the ratio of the sum of the contents, in weight percent, of (a) ZrO2 and Y2O3 to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is 0.30 to 2.0, such as 0.35 to 1.80, 0.50 to 1.50, 0.65 to 1.25, or 0.75 to 1.10. In an embodiment, the ratio is at least 0.30, at least 0.35, at least 0.50, at least 0.65, or at least 0.75. The ratio can be up to 2.0, up to 1.80, up to 1.50, up to 1.25, up to 1.10, or up to 0.75.

[0053] In some embodiments, the sum of the contents, in weight percent, of Al2O3 and ZrO2 is 10.0-30.0, 15.0-28.0, or 22.0-26.0. The ratio of the amount, in weight percent, of ZrO2 to the amount, in weight percent, of Al2O3 can be at least 0.30, at least 0.35, at least 0.45, at least 0.50, or even at least 0.70. Optionally, the ratio can be at most 1.80, at most 1.30, or at most 1.10. In some embodiments, the ratio is 0.30-1.80, 0.45-1.30, or 0.50-1.10. It has been found that these ratios provide good chemical resistance within the composition matrix of the present disclosure.

[0054] Optionally, the glass includes alkali metal oxides. The total amount of alkali metal oxides R2O can be 10.0-30.0 wt%. Optionally, this amount is at most 25.0 wt%, at most 22.0 wt%, at most 20.0 wt%, at most 18.0 wt%, or at most 16.0 wt%. A certain amount of alkali metal oxides may be necessary to obtain sufficient CSS properties. Thus, a minimum amount can be 10.0 wt%, 11.0 wt%, 12.0 wt%, or even 13.0 wt%. For example, the amount of R2O can range from 10.0-25.0 wt%, 11.0-20.0 wt%, 11.0-18.0 wt%, or 12.0-16.0 wt%. In some embodiments, the total content of all alkali metal oxides R2O is less than 19.5 wt%, less than 19.0 wt%, or less than 18.5 wt%.

[0055] Optionally, the ratio of (a) the sum of the contents, in weight percent, of all alkali metal oxides R2O to the content, in weight percent, of (b) SiO2 is 0.0 to <0.37, 0.0 to <0.35, <0.30, or <0.28.

[0056] In one embodiment, the most abundant alkali metal oxide in the glass composition is Na2O, the second most abundant alkali metal oxide, if present, is K2O, and the third most abundant alkali metal oxide, if present, is Li2O. Alternatively, the most abundant alkali metal oxide may be K2O, the second most abundant alkali metal oxide, if present, is Na2O, and the third most abundant alkali metal oxide, if present, is Li2O. In one embodiment, Li2O is not the most abundant alkali metal oxide. Optionally, the most abundant alkali metal oxide is either Na2O or K2O. For example, Li2O may be present in a lesser amount than Na2O and / or in a lesser amount than K2O.

[0057] Li2O can be present in the glass in an amount of up to 5.0 wt%, up to 4.0 wt%, up to 3.0 wt%, up to 2.5 wt%, up to 2.0 wt%, up to 1.5 wt%, up to 1.0 wt%, up to 0.5 wt%, up to 0.2 wt%, or up to 0.1 wt%. In some embodiments, the glass is free of Li2O.

[0058] KO can be present in the glass in an amount of up to 20.0 wt%, up to 18.0 wt%, or up to 16.0 wt%. In some embodiments, the KO content can be at least 10.0 wt%, or at least 12.0 wt%. In one embodiment, the glass composition includes KO in an amount of 5.0 wt% or less, 4.5 wt% or less, 4.0 wt% or less, 3.5 wt% or less, 3.0 wt% or less, 2.8 wt% or less, 2.5 wt% or less, or 2.0 wt% or less, or 1.5 wt% or less. Alternatively, it can be used in a proportion of at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%.

[0059] Na2O can be present in the glass in an amount of up to 20.0 wt%, up to 18.0 wt%, or up to 16.0 wt%. In some embodiments, the Na2O content can be at least 10.0 wt%, or at least 12.0 wt%. In one embodiment, the glass composition includes Na2O in an amount of 3.0 wt% or less, 2.8 wt% or less, 2.5 wt% or less, or 2.0 wt% or less.

[0060] Optionally, the total amount of Na2O and / or K2O can range from 10.0 to 20.0 wt%, 12.0 to 18.0 wt%, or 12.0 to 16.0 wt%.

[0061] One or more oxides selected from ZnO, Li2O, Na2O, KO, MgO, CaO, SrO, BaO, and combinations thereof can be present in the glass in a total amount of 10.0 to 40.0 wt.%, and in most embodiments, this total amount is less than 30.0 wt.%, less than 25.0 wt.%, or less than 22.0 wt.%.

[0062] The amount of CaO in the glass can be, for example, at most 7.0 wt.%, at most 5.0 wt.%, at most 3.0 wt.%, at most 2.0 wt.%, at most 1.0 wt.%, at most 0.5 wt.%, at most 0.2 wt.%, or at most 0.1 wt.%. The glass may be free of CaO.

[0063] The amount of SrO in the glass can be, for example, at most 7.0 wt.%, at most 5.0 wt.%, at most 3.0 wt.%, at most 2.0 wt.%, at most 1.0 wt.%, at most 0.5 wt.%, at most 0.2 wt.%, or at most 0.1 wt.%. The glass may be free of SrO.

[0064] The amount of BaO in the glass can be, for example, at most 7.0 wt.%, at most 5.0 wt.%, at most 3.0 wt.%, at most 2.0 wt.%, at most 1.0 wt.%, at most 0.5 wt.%, at most 0.2 wt.%, or at most 0.1 wt.%. The glass may be free of BaO.

[0065] The sum of the amounts of CaO, SrO and BaO in the glass can be, for example, at most 7.0% by weight, at most 5.0% by weight, at most 3.0% by weight, at most 2.0% by weight, at most 1.0% by weight, at most 0.5% by weight, at most 0.2% by weight, or at most 0.1% by weight. The glass may be free of CaO, SrO and BaO.

[0066] In the present disclosure, when a glass is described as being free of or free from a certain component, this means that this component is only permitted to be present in the glass as an impurity. This means that this component is not added in a substantial amount. By not in a substantial amount, we mean an amount of less than 500 ppm (wt), less than 400 ppm (wt), less than 300 ppm (wt), less than 200 ppm (wt), less than 100 ppm (wt), in particular less than 50 ppm (wt), or less than 10 ppm (wt).

[0067] The amount of ZnO in the glass can range from 0-5.0 wt%, 0-4.0 wt%, 0-3.0 wt%, or 0-2.0 wt%. Some embodiments contain less than 100 ppm ZnO. In some embodiments, the amount of ZnO can range from 0.5-5.0 wt%, or 1.0-4.0 wt%.

[0068] The total amount of alkaline earth metal oxides plus the amount of ZnO can be 0 to 15.0% by weight, 0 to 10.0% by weight, 0 to 7.5% by weight, or 0 to 5.0% by weight.

[0069] Optionally, the amount of alkaline earth metal oxide R'O is less than 10.0 wt%, less than 6.0 wt%, less than 4.0 wt%, or less than 2.0 wt%, or it can be used in a proportion of at least 1.0 wt%, at least 2.0 wt%, or at least 3.0 wt%.

[0070] In one embodiment, the ratio of the sum of the contents, in weight percent, of all alkaline earth metal oxides R'O (a) to the content, in weight percent, of (b) SiO2 is 0.00 to <0.06, 0.0 to <0.05, <0.04, <0.03, <0.02, or <0.01. Optionally, this ratio can be >0.01, >0.02, or >0.03. For example, this ratio can be >0.01 to <0.06, or >0.02 to <0.05.

[0071] In some embodiments, the glass may include MgO in an amount of 0.0-6.0 wt%, 0.1-5.0 wt%, or 0.5-4.0 wt%. Optionally, the amount of MgO is at least 0.1 wt%, at least 0.5 wt%, or at least 1.0 wt%, such as at least 1.5 wt%, at least 2.0 wt%, or at least 2.5 wt%. MgO may be advantageous with respect to devitrification resistance. Additionally, MgO may be advantageous with respect to chemical strengthening performance. In some embodiments, the glass does not include MgO.

[0072] Optionally, the sum of the weight percent content of MgO and the second most abundant alkali metal oxide is less than 8.0 wt.%, less than 6.0 wt.%, or less than 4.0 wt.%. In one embodiment, MgO can be used in a proportion of at least 1.0 wt.%, at least 2.0 wt.%, or at least 3.0 wt.%.

[0073] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 3] Includes.

[0074] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 4] Includes.

[0075] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 5] Includes.

[0076] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 6] Includes.

[0077] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 7] Includes.

[0078] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 8] Includes.

[0079] Any potassium- and yttrium-containing glass of the present disclosure may contain the following components in weight percent: [Table 9] Includes.

[0080] Any potassium-containing glass of the present disclosure may contain the following components in weight percent: [Table 10] Includes.

[0081] Any yttrium-containing glass of the present disclosure may comprise the following components, in weight percent: [Table 11] Includes.

[0082] Any boron-containing glass of the present disclosure may contain the following components, in weight percent: [Table 12] Includes.

[0083] Any phosphorus-containing glass of the present disclosure may comprise the following components in weight percent: [Table 13] Includes.

[0084] Any magnesium-containing glass of the present disclosure may comprise the following components, in weight percent: [Table 14] Includes.

[0085] Any phosphorus- and zinc-containing glass of the present disclosure may contain the following components in weight percent: [Table 15] Includes.

[0086] Any zinc-containing glass of the present disclosure may contain the following components in weight percent: [Table 16] Includes.

[0087] Any glass of the present disclosure may comprise the following components, in weight percent: [Table 17] where R'O is the sum of the amounts of all alkaline earth metal oxides.

[0088] The glass may include one or more fining agents such as CeO2, SnO2, Cl, SO3. Optionally, Fe2O3 may be used as a fining aid. Thus, the glass may optionally include Fe2O3. Since it is desirable to avoid arsenic and antimony, which are toxic fining agents, the sum of the amounts of arsenic and antimony may be less than 100 ppm. Due to toxicity concerns, the sum of the amounts of lead and bismuth may be less than 100 ppm. In an embodiment, the glass may include F in an amount less than 1 wt.%.

[0089] Parameters The thermal expansion coefficient of glass is 8.8 x 10 -6 K -1 Less than 8.5×10 -6 K -1 Less than or equal to 8.2 x 10 -6 K -1 In an exceptional embodiment, the thermal expansion coefficient can be up to 10.0×10 -6 K -1 , up to 9.5×10 -6 K -1 , or up to 9.2×10 -6 K -1 Optionally, the thermal expansion coefficient is at least 6.0×10 -6 K -1 , at least 7.0 × 10 -6 K -1 , or at least 7.2 × 10 -6 K -1 In an embodiment, the thermal expansion coefficient of the glass is 6.0×10 -6 K -1 ~9.2×10 -6 K -1 , 7.0×10 -6 K -1 ~8.8×10 -6 K -1 , or 7.2 × 10 -6 K -1 ~8.2×10 -6 K-1 In one embodiment, the thermal expansion coefficient is in the range of 8.0×10 -6 K -1 Less than or even 7.9×10 -6 K -1 is less than.

[0090] The glass may have a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa. Optionally, the Young's modulus is up to 90 GPa, up to 88 GPa, or up to 86 GPa. In embodiments, the Young's modulus of the glass ranges from 70 GPa to 90 GPa, 74 GPa to 88 GPa, or 75 GPa to 86 GPa. In some embodiments, the Young's modulus is at least 80 GPa, or even at least 82 GPa.

[0091] In one embodiment, the glass has a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250. Optionally, the Poisson's ratio can be less than 0.260, less than 0.255, or less than 0.250. In an embodiment, the Poisson's ratio is at least 0.220, at least 0.225, or at least 0.230.

[0092] Optionally, the glass has a viscosity of 2.530 to 2.800 g / cm 3 , 2.580~2.700g / cm 3 , or 2.600~2.690g / cm 3 The density is at least 2.530 g / cm 3 , at least 2.580g / cm 3 , or at least 2.600 g / cm 3 In an embodiment, the density can be up to 2.800 g / cm 3 , up to 2.700g / cm 3 , up to 2.690g / cm 3 , or up to 2.680g / cm 3 It becomes.

[0093] In one embodiment, the glass has a glass transition temperature T of at least 590° C., at least 610° C., or at least 625° C. g In one embodiment, T g may be at least 655°C or at least 665°C, while certain embodiments have a T of greater than 710°C. g Optionally, T g may be less than 860° C., or less than 810° C. In an embodiment, T g is in the range of 590 to 860°C, 610 to 860°C, or 625 to 810°C. g High T of the glass allows it to tolerate high temperatures during the ion exchange process. g When the temperature is high, the T g The stress relaxation induced by ion exchange at high temperatures is smaller than at lower temperatures. High temperatures accelerate the ion exchange process, making ion exchange more economical.

[0094] In one embodiment, the glass can have a strain point of at least 580°C, at least 600°C, or at least 615°C. In some embodiments, the strain point can be at least 645°C, or at least 655°C, while certain embodiments can have strain point values ​​above 700°C. Optionally, the strain point can be less than 850°C, or less than 800°C. In embodiments, the strain point ranges from 580-850°C, 600-850°C, or 615-800°C. A high strain point allows for high temperatures during the ion exchange process. A high strain point glass results in less stress relaxation induced by ion exchange at high temperatures than a low strain point glass. The high temperatures accelerate the ion exchange process, making ion exchange more economical.

[0095] Optionally, the glass composition comprises: a temperature T4 of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C; a temperature T3 of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C or at least 1450°C, · VFT constant A < 0.00, optionally -4.00 to -2.00; VFT constant B >5,000°C, optionally 6,000-8,000°C, and 150~550℃, e.g. 200~400℃, or VFT constant T0 up to 355℃ Indicates one or more of the following:

[0096] The glasses of the present disclosure can have a significant steepness of the temperature viscosity curve. The steepness of the curve is determined by the temperature T4 and T 7.6 In glasses of the present disclosure, this difference can be at least 250K, at least 265K, at least 280K, or at least 300K. Optionally, this value does not exceed 400K, 380K, or 360K. For example, temperatures T4 and T 7.6 The difference from can be in the range of 250-400K, 265-380K, or 280-360K.

[0097] All these parameters describe the viscous behavior of the glass. The glasses of the present disclosure have a fairly high characteristic temperature, which allows the use of high temperatures during ion-exchange, thereby accelerating the ion-exchange process.

[0098] An important property of the glasses of the present disclosure is their ability to build up high compressive stresses in a very short time. This property is quantified by the CSS score (or simply "CSS"), which corresponds to the compressive stresses formed in the test specimen. Further subscripts used indicate the thickness of the glass used to measure the CSS. The glass compositions of the present disclosure have significant CSS values ​​at small glass thicknesses.

[0099] Optionally, the glasses of the present disclosure have a CSS of at least 800 MPa, at least 900 MPa, at least 1000 MPa, at least 1150 MPa, or even at least 1250 MPa.200μm This is a very significant ease of compressive stress, which makes it possible to introduce very high compressive stresses into the glass in a short time. 200μm In an embodiment, the CSS 200μm The compressive stress ranges from 800 MPa to 1800 MPa, 900 MPa to 1600 MPa, or 1000 MPa to 1500 MPa. Prior art glass compositions reach such high compressive stresses after much longer ion-exchange times. In many cases, prior art glass compositions reach a compressive stress of 1000 MPa after more than four hours of ion-exchange, or never reach this compressive stress at all.

[0100] Optionally, the glasses of the present disclosure have a CSS of at least 600 MPa, at least 700 MPa, at least 800 MPa, at least 850 MPa, or even at least 900 MPa. 30μm Optionally, CSS 30μm is in the range of up to 1200 MPa, up to 1100 MPa, or up to 1000 MPa. 30μm In one embodiment, the CSS 30μm What is a score? 30μm Prior art glass compositions do not reach such high compressive stresses at such small thicknesses.

[0101] Another way to express the remarkable property of this glass tolerating compressive stress is the 1000 MPa IOX time, i.e., the time of ion exchange treatment in an alkali nitrate bath required for a glass specimen to reach a compressive stress of 1000 MPa at its surface. Optionally, the 1000 MPa IOX time of the glasses of the present disclosure is less than 60 minutes, less than 30 minutes, or even less than 20 minutes. In one embodiment, the 1000 MPa IOX time refers to the IOX time in a potassium nitrate bath.

[0102] The remarkable ability of this glass to be chemically strengthened is further explained in relation to its diffusivity. A high diffusivity means that the glass can acquire a compressive stress layer of sufficient depth in a short time, making the manufacturing process of the glass more economical. In certain embodiments, the glasses of the present disclosure have a diffusivity of at least 10 μm. 2 / h, 14μm 2 / h, 18μm 2 / h, 25μm 2 / h, 35μm 2 / h. Optionally, this value is up to 80 μm 2 / h, 70μm 2 / h, or 60μm 2 In one embodiment, the diffusion rate can be in the range of 10 to 80 μm / h. 2 / h, 14~70μm 2 / h, or 18 to 60 μm 2 / h.

[0103] The glasses of the present disclosure include: (a) a hydrolysis resistance value in μg / g sodium equivalent of less than 100, less than 60, less than 40, or less than 30; (b) mg / dm 2 Alkali resistance values ​​of less than 50, less than 40, less than 30, or less than 20 in weight loss units; (c) mg / dm 2 Acid resistance values ​​of less than 30, less than 20, less than 15, less than 10, or less than 5 in weight loss units The chemical resistance can be characterized by one or more of the following:

[0104] Optionally, the hydrolysis resistance value in μg / g sodium equivalent can be at least 1, at least 5, or at least 10. In one embodiment, the hydrolysis resistance value in mg / dm 2 The alkali resistance value in weight loss units is at least 1, at least 5, or at least 8. Further, 2 The acid resistance value in weight loss units can be at least 1, at least 2, or at least 3.

[0105] The glasses of the present disclosure have a compressive stress susceptibility CSS in MPa as a function of the total content in weight percent of alkali metal oxide R2O and alkaline earth metal oxide R'O. 200μm / ([RO]+[RO]) is significant. Prior art glasses require very large amounts of alkali metal oxides or alkaline earth metal oxides to achieve compressive stress during ion exchange. In contrast, the compositions described herein build high compressive stresses even with moderate proportions of alkali metals and alkaline earth metals. Optionally, CSS 200μm / ([RO]+[RO]) is at least 35, at least 50, at least 60, at least 80, or at least 90. 200μm / ([R2O]+[R'O]) is at least 100, at least 120, or at least 140. 200μm / ([RO]+[RO]) is in the range of up to 250, up to 200, or up to 150. 200μm / ([R2O]+[R'O]) is 50 to 250, 60 to 200, or 60 to 150. For ease of viewing, the units (MPa / wt%) of this parameter are not shown.

[0106] In one embodiment, the present disclosure provides a CSS in MPa versus thermal expansion coefficient in ppm / K in the temperature range of 20 to 300° C. 200μm , i.e. CSS 200μm / CTE of at least 85, at least 100, at least 110, at least 120, or at least 130. Prior art glass compositions often have a 9.0×10 -6 K -1 The glass composition of the present disclosure has a disadvantage of having a high thermal expansion coefficient exceeding 100%. 200μm For example, CSS from 100 to 250, 110 to 220, or 120 to 200 200μmFor example, CSS / CTE can range up to 250, up to 220, or up to 200. For ease of viewing, the units (MPa·K / ppm) of this parameter are not shown.

[0107] The refractive index of the glass used in the display should not be too high in order to provide limited reflectivity. Optionally, the refractive index n of the glass of the present disclosure d is less than 1.600, less than 1.550, or even less than 1.540. In some embodiments, the refractive index is in the range of 1.520 to 1.600, or 1.530 to 1.550.

[0108] In one embodiment, the glass is particularly suitable for processing (viscosity 10 4 dPas), which is useful because the glass can be produced by a downdraw process. In one embodiment, the glass can be produced by a downdraw process such as slot downdraw or overflow fusion downdraw. 4 No devitrification at all is desirable at 10 dPas. However, slightly higher viscosities, especially at 10 5 At a viscosity of 10 dPas, a low crystal growth rate can be tolerated. 5 Glasses with crystal growth rates below 0.5 μm / min at viscosities of 100 dPas are generally suitable for production by downdraw.

[0109] Therefore, in this disclosure, the devitrification resistance is 10 5 It can be expressed as the crystal growth rate at a viscosity in dPas. The lower the crystal growth rate, the higher the resistance to devitrification and therefore the yield. Methods for measuring the crystallization rate are well known. The crystallization rate is measured along the formed crystals, i.e. at their greatest extension. In particular, the crystallization rate is determined when the glass is subjected to a gradient heat treatment (for example using a gradient furnace).

[0110] The so-called lower devitrification temperature (LDT) is the temperature at which devitrification begins in the heating regime. Above the liquidus temperature (also called upper devitrification temperature (UDT)), crystallization does not occur even after a long time. The values ​​of LDT and UDT generally vary from glass to glass. In this specification, the terms "crystallization" and "devitrification" are used synonymously, unless otherwise specified.

[0111] If crystallization does occur, it will occur above a lower devitrification temperature (LDT) and below an upper devitrification temperature (UDT), i.e., in the range between the LDT and UDT. Typically, tests are performed at different temperatures to determine the crystal growth rate at different viscosities. This also allows the determination of the LDT and UDT as the lower and upper limits, respectively, of the temperature range in which crystallization occurs.

[0112] The crystal growth rate can be determined by heat treating the glass in a gradient furnace with an increasing temperature regime for 16 hours. A gradient furnace is a furnace with different heating zones and therefore areas at different temperatures. An increasing temperature regime means that the temperature of the glass is lower than the temperature of any area of ​​the furnace before entering the furnace. Therefore, the temperature of the glass increases by entering the furnace regardless of which area of ​​the furnace the glass is placed in. Therefore, devitrification can be measured by heat treating the glass in a gradient furnace with different temperature zones (preheated) for 16 hours. Because gradient furnaces are divided into different locations or zones of temperature, they have a location-based gradient rather than a time-based gradient.

[0113] Because the furnace is divided into several heating zones, it is possible to test different temperatures (and therefore different viscosities) simultaneously. This is a particular advantage of gradient furnaces. The temperatures must be selected so that the crystallization kinetics can be determined at different temperatures (and therefore different viscosities) in the range between the LDT and UDT. If the LDT and UDT are unknown, it is useful to test a relatively wide range of temperatures to enable the determination of the LDT and UDT. For example, the minimum temperature of the gradient furnace can be selected to be about 350 K below the process temperature (working point) of the glass. The working point is 10 4 Corresponds to a viscosity in dPas.

[0114] As mentioned above, 10 5 The crystal growth rate at a viscosity of 100 dPas is important for productivity by downdraw processes. Optionally, the glass of the present invention has a crystal growth rate of 100 dPas, especially when the glass is heat treated in a gradient furnace for 16 hours in an increasing temperature regime. 5 The devitrification resistance is such that the crystal growth rate at a viscosity of 10 dPas is at most 0.5 μm / min, at most 0.4 μm / min, at most 0.3 μm / min, at most 0.2 μm / min, at most 0.1 μm / min, at most 0.05 μm / min, at most 0.02 μm / min, or at most 0.01 μm / min. 5 The important thing is that there is no devitrification at all at a viscosity of 10 dPas. 5 If no devitrification occurs at a viscosity of 10 dPas, 5 The inability to determine crystal growth rates at viscosities of 10 dPas. 5 The absence of devitrification at a viscosity of dPas can also be expressed as a crystal growth rate of 0 μm / min.

[0115] Optionally, the crystallization rate is determined using glass particles, in particular glass particles with a diameter of about 2 mm to 3 mm. Such glass particles are placed on a carrier, such as a platinum carrier for gradient heat treatment. For example, the carrier can be provided with depressions for respectively catching the glass particles and with holes at the bottom of each depression, so that the crystallization rate can be determined under a microscope. Taking into account the size of the glass particles, the diameter of each depression can be 2 mm and the diameter of each hole can be 0.9 mm.

[0116] After heat treatment, it is possible to examine under a microscope what crystal growth rate occurred at what temperature range (and therefore what viscosity). 5 The crystal growth rate at a viscosity in dPas is determined based on the known correlation between temperature and viscosity. In particular, based on the glass composition, it is known what viscosity corresponds to what temperature. The LDT and UDT can be determined as the lower and upper limits, respectively, of the temperature range in which crystallization occurs. Since it is known what temperature was at what position in the furnace and what glass grain was at what position in the furnace during the heat treatment, different glass grains can be easily assigned to different temperatures in the gradient furnace.

[0117] Items that can be enhanced The glass article of the present disclosure can have a thickness of 1,000 μm or less and can include or consist of the glass described herein. In general, the article can also be referred to as a thin glass article or a sheet of glass. It can have a thickness of less than 850 μm, less than 500 μm, less than 300 μm, less than 200 μm, or less than 100 μm. In some embodiments, the thickness can be as low as 80 μm or less, or less than 70 μm. Some articles have a thickness of 50 μm or less, or less than 40 μm or less. Such thin glass articles have folding and / or foldable properties. For such flexible or foldable cover glass, the desired thickness can be less than 100 μm, less than 80 μm, less than 60 μm, or less than 40 μm. A minimum thickness may be required for the article to have sufficient impact resistance. The minimum thickness can be at least 5 μm, at least 10 μm, or at least 15 μm.

[0118] Due to the outstanding property of having low CTE and other desirable features, the glass article can be manufactured with warpage of less than 3.0 mm, less than 2.0 mm, or less than 1.0 mm. Generally, the glass article can be manufactured by a drawing process, where the temperature difference between different parts of the glass causes warpage. The glass of the present disclosure has low CTE and other desirable properties, such as good viscosity characteristics, so that the article can be obtained with less warpage. In some embodiments, the warpage is at least 5 μm, at least 10 μm, at least 100 μm, or at least 250 μm.

[0119] Optionally, the article can have a total thickness variation of less than 15 μm, less than 10 μm, less than 7 μm, or less than 5 μm. In an embodiment, the TTV can range from 1 μm to 10 μm. In one embodiment, the TTV is ±10%, ±5%, or ±3% of the thickness of the glass article.

[0120] The item must be at least 10cm 2 , at least 15 cm 2 , or at least 20 cm2 In an embodiment, the article may have an area of ​​10,000 cm 2 Less than 1,000cm 2 Less than or equal to 200cm 2 It may have an area of ​​less than 100 mm.

[0121] The article has a surface roughness R of 5.0 nm or less, 3.0 nm or less, or 1.5 nm or less on one or both of its major surfaces. a Such very small roughness can be obtained in a downdraw process.

[0122] The article may have significant chemical resistance on one or both of its major surfaces. (a) a hydrolysis resistance value in μg / g sodium equivalent of less than 100, less than 60, less than 40, or less than 30; (b) mg / dm 2 Alkali resistance values ​​of less than 50, less than 40, less than 30, or less than 20 in weight loss units; (c) mg / dm 2 Acid resistance values ​​of less than 30, less than 20, less than 15, less than 10, or less than 5 in weight loss units The present invention may be characterized by one or more of the following:

[0123] The glass article may have a Vickers hardness of at least 580, at least 590, or at least 600. Optionally, the Vickers hardness is in the range of 580-800, 590-700, or 600-630.

[0124] In one embodiment, the glass article exhibits excellent three-point bend strength, exhibiting a three-point bend strength of at least 100 MPa, at least 200 MPa, or at least 300 MPa. It is surprising that such strength can be achieved without ion exchange strengthening. With such high initial strength, the strength of the article after ion exchange is even more remarkable. Optionally, the three-point bend strength can range from 100 MPa to 600 MPa, 200 MPa to 500 MPa, or 300 MPa to 400 MPa.

[0125] Enhanced Items The glass article may include an ion exchange layer on one or both of its major surfaces. The ion exchange layer imparts high strength to the glass article. Optionally, the article may have a compressive stress of at least 400 MPa, at least 700 MPa, at least 800 MPa, or at least 900 MPa on one or both of its major surfaces. In embodiments, the compressive stress may range from up to 1800 MPa, up to 1600 MPa, up to 1500 MPa, or up to 1400 MPa. For example, the compressive stress may range from 400 MPa to 1800 MPa, 700 MPa to 1600 MPa, or 800 MPa to 1400 MPa.

[0126] In one embodiment, the glass article has a thickness of 20 to 40 μm, for example 25 to 35 μm, and has a compressive stress on one or both of its major surfaces of at least 800 MPa, at least 850 MPa, or at least 900 MPa.

[0127] Optionally, the glass article exhibits a DoL of 6 to 12 μm, or 7 to 11 μm on one or both of its major surfaces. For example, the DoL may be at least 6 μm, at least 7 μm, or at least 8 μm. Alternatively or additionally, the DoL may range up to 15 μm, up to 13 μm, up to 12 μm, or up to 11 μm.

[0128] In one embodiment, the DoL is 15%-25% of the thickness of the article, or 16%-20% of the thickness of the article. In an embodiment, the DoL is at least 15% of the thickness of the article, at least 16% of the thickness of the article, or at least 17% of the thickness of the article. The DoL can be up to 33%, up to 25%, or up to 20% of the thickness of the article. In this context, the DoL refers to the depth of one compressive stress layer. The sum of the DoLs of all compressive stress layers can be greater.

[0129] One surprising property of the articles of the present disclosure is that very high compressive stresses can be achieved even in thin articles. In an embodiment, the glass article has, on one or both of its major surfaces, a ratio of compressive stress in MPa to the thickness of the article in μm of at least 4.0, at least 5.0, at least 6.0, or at least 10.0. In an embodiment, this value can reach up to 40.0, up to 35.0, or up to 30.0. Optionally, the ratio of compressive stress in MPa to the thickness of the article in μm is up to 10.0, up to 8.0, or up to 7.0. In an embodiment, the ratio of compressive stress in MPa to the thickness of the article in μm is in the range of 4.0 to 40.0, 5.0 to 35.0, 5.0 to 30.0, or 10.0 to 29.0. In one particular embodiment, this value is in the range of 20.0 to 30.0. In one embodiment, the ratio of compressive stress in MPa to the thickness of the article is at least 20.0, or at least 25.0.

[0130] Optionally, the article can have, on one or both of its major surfaces, a ratio of compressive stress in MPa to depth of the ion exchange layer in μm of at least 50, at least 75, or at least 90. In an embodiment, this value is even at least 100, at least 120, or at least 140. For example, the ratio of compressive stress in MPa to depth of the ion exchange layer in μm can range from 50 to 400, 75 to 300, or 90 to 200. In an embodiment, the ratio of compressive stress in MPa to depth of the ion exchange layer in μm is up to 400, up to 300, or up to 200.

[0131] In one embodiment, the present disclosure relates to a glass article exhibiting a three-point bend strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa.

[0132] In one embodiment, the glass article exhibits excellent three-point bend strength, exhibiting a three-point bend strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa. It is surprising that such strengths can be achieved. Optionally, the three-point bend strength can range from 400 MPa to 1200 MPa, 500 MPa to 1000 MPa, or 600 MPa to 800 MPa.

[0133] electronic equipment The glass and / or glass articles can be used in electronic devices such as portable computers, smart phones, tablet computers, and other handheld or wearable devices. The glass and / or glass articles can be part of a display.

[0134] Thus, an electronic device according to the present disclosure can comprise a glass or glass article according to the present disclosure. The electronic device can comprise a display, the display comprising a glass and / or glass article of the present disclosure. The glass article can be a cover glass for the electronic device.

[0135] The electronic device can be a flexible and / or foldable device, for example a flexible and / or foldable smartphone or tablet computer.

[0136] Manufacturing method Glass can be produced by melting a batch of suitable raw materials to obtain the composition of the present disclosure. For example, glass can be melted in a platinum crucible. After melting, the glass melt can be refined with one or more fining agents to remove bubbles. Instead of using chemical fining agents, physical fining methods such as vacuum fining can also be used.

[0137] On an industrial scale, glass articles can be produced by float or downdraw processes such as slot downdraw and overflow fusion downdraw, with slot downdraw being preferred because it allows very small thicknesses to be achieved.

[0138] After molding, the article can be strengthened by ion exchange (also called "chemical strengthening"). Strengthening can include immersion of the article in a molten salt bath. The salt is selected based on the desired ion exchange process. In a preferred embodiment, the salt is an alkali salt, such as an alkali nitrate. In one embodiment, the salt bath includes potassium nitrate, optionally about 100% KNO3.

[0139] Chemical strengthening of glass articles by ion exchange is well known to those skilled in the art. The strengthening process can be carried out by immersing the glass article in a salt bath containing monovalent ions to exchange with the alkali ions in the glass. The monovalent ions in the salt bath replace the alkali ions in the glass, e.g., Na + , K + and / or Cs + The ions have a larger radius than the cations. Compressive stresses build up in the glass after ion exchange as the larger ions are forced into the glass network. The strength of the glass is significantly increased after ion exchange. Furthermore, the CS induced by chemical strengthening improves the bending properties of the strengthened glass article and improves the scratch resistance of the glass article. Typical salts used for chemical strengthening are e.g. K + The optional salt bath for chemical strengthening is a molten salt or salt mixture containing Na + Contains and / or K +The optional salts are NaNO3, KNO3, CsNO3, NaCl, KCl, CsCl, Na2SO4, K2SO4, Cs2SO4, Na2CO3, K2CO3, Cs2CO3 and K2Si2O5. To better control the ion exchange rate for chemical strengthening, additives such as NaOH, KOH and other sodium and potassium salts are also used. Ion exchange can be carried out, for example, in KNO3, at temperatures in the range of 300-480 ° C, or in the range of 340-480 ° C, in particular in the range of 340-450 ° C, or in the range of 390-450 ° C. Chemical strengthening is not limited to a single step. To achieve better strengthening performance, chemical strengthening can include multiple steps in one or more salt baths with various concentrations of alkali metal ions and / or different ions in the salt bath. Thus, chemically strengthened glass articles can be strengthened in a single step or through multiple steps, for example a two-step step. Two-step chemical strengthening is particularly applicable to Li2O-containing glasses, since lithium can be exchanged for sodium and potassium ions.

[0140] The inventors have found that the glass exhibits very rapid ion exchange and achieves high compressive stresses in a short time. The time for immersion of the article in the molten salt bath at the indicated temperature can range from 20 minutes to 12 hours, 25 minutes to 4 hours, or 30 minutes to 2 hours. Optionally, the time is at least 20 minutes, at least 25 minutes, or at least 30 minutes. In embodiments, the ion exchange time is 2 hours or less, or 1 hour or less.

[0141] Optionally, during the ion exchange, the temperature of the salt bath is T g -400~T g -100°C or T g -250~T g The temperature range is -150℃.

[0142] In one embodiment, the method comprises: - melting a batch of raw materials as required to obtain a glass according to the present disclosure; forming a glass article, such as a glass article described herein; strengthening the article by ion exchange treatment in an ion exchange bath; Includes.

[0143] Items of this disclosure Each of the following items represents a specific embodiment of the glasses, glass articles, and other aspects of the present disclosure described in detail herein above.

[0144] Item 1 is the following: i. SiO2, ii. Al2O3 and / or B2O3 in a total amount of 5.0 to 25.0 wt. %; ii. ZrO2 and / or Y2O3 in a total amount of at least 3.0 wt. %; iii. 10.0 to 40.0 wt. % in total of one or more oxides selected from ZnO, Li2O, Na2O, KO, MgO, CaO, SrO, BaO, and combinations thereof; and iv. Optionally, one or more components selected from P2O5 and TiO2. The present invention relates to a glass comprising:

[0145] Item 2 has a thermal expansion coefficient of 10.0×10 in the temperature range of 20 to 300°C. -6 K -1 Less than 9.5×10 -6 K -1 Less than 9.2 x 10 -6 K -1 Less than 8.8×10 -6 K -1 Less than 8.5×10 -6 K -1 Less than or equal to 8.2 x 10 -6 K -1 The glass of item 1,

[0146] Item 3 relates to the glass of items 1 or 2 having a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa.

[0147] Item 4 relates to at least one glass according to items 1 to 3, having a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250.

[0148] Item 5 relates to at least one glass of items 1 through 4 having a 1000 MPa IOX time of less than 60 minutes.

[0149] Item 6: 2.530~2.800g / cm 3 , 2.580~2.700g / cm 3 , or 2.600~2.690g / cm 3 The glass of claim 1, wherein the glass has a density of

[0150] Item 7 is a glass transition temperature T of at least 590° C., at least 610° C., or at least 625° C. g 7. The glass of claim 1, wherein

[0151] Item 8 is CSS in a 100% KNO3 bath. 200μm The glass of claim 1, further comprising a compressive stress susceptibility, defined as a compressive stress score, of at least 800 MPa.

[0152] Item 9 is as follows: (a) a hydrolysis resistance value in μg / g sodium equivalent of less than 100, less than 60, less than 40, or less than 30; (b) mg / dm 2 Alkali resistance values ​​of less than 50, less than 40, less than 30, or less than 20 in weight loss units; (c) mg / dm 2 Acid resistance values ​​of less than 30, less than 20, less than 15, less than 10, or less than 5 in weight loss units 9. The glass of claim 1, further comprising at least one of the following chemical resistance properties:

[0153] Item 10 is the compressive stress susceptibility CSS in MPa versus the total content in weight percent of alkali metal oxides R2O and alkaline earth metal oxides R'O 200μm 10. The glass of claim 1, wherein / ([RO]+[RO]) is at least 35, at least 50, at least 60, or at least 80.

[0154] Item 11 is the ease of compressive stress in MPa relative to the thermal expansion coefficient in ppm / K in the temperature range of 20 to 300°C, i.e., CSS 200μm 11. At least one of the glasses of items 1 to 10, wherein the CTE is at least 85, at least 100, at least 110, or at least 120.

[0155] Item 12 relates to at least one glass according to items 1 to 11, in which the total amount of alkali metal oxides, alkaline earth metal oxides and ZnO is 27.0% by weight or less.

[0156] Item 13 relates to at least one of the glasses of items 1 to 12, wherein the ratio, in weight percent, of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A is less than 0.23, less than 0.22, or less than 0.18.

[0157] Item 14 relates to the glasses of item 13, in which A=Na2O and B=K2O or B=Na2O and A=K2O.

[0158] Item 15 relates to at least one of the glasses of items 1 to 14, wherein the ratio of the weight of K2O to the sum of the weights of Li2O and Na2O is less than 0.23, less than 0.22, or less than 0.18.

[0159] Item 16 relates to at least one of the glasses of items 1 to 15, wherein the ratio of the weight of Na2O to the sum of the weights of Li2O and K2O is less than 0.23, less than 0.22, or less than 0.18.

[0160] Item 17 relates to at least one of the glasses of items 1 to 16, wherein the ratio of the weight of SiO2 to the sum of the weights of Li2O and Na2O is less than 5.5, less than 4.9, or less than 4.5.

[0161] Item 18 is as follows: - SiO2 in an amount of at least 50.0% by weight or at least 55.0% by weight and / or K2O in an amount of less than 3.0% by weight 18. The glass of claim 1, further comprising at least one of said glasses.

[0162] Item 19 relates to at least one of the glasses according to items 1 to 18, in which the sum of the Al2O3 and B2O3 contents is less than 20.5% by weight, less than 18.0% by weight, or less than 17.0% by weight.

[0163] Item 20 relates to at least one of the glasses of items 1 to 19, wherein the sum of the Al2O3 and B2O3 content is at least 5.0 wt.-%, at least 7.0 wt.-%, at least 8.5 wt.-%, or at least 10.5 wt.-%.

[0164] Item 21 relates to at least one of the glasses according to items 1 to 20, in which the sum of the content of all alkali metal oxides R2O is less than 20.5% by weight, less than 19.5% by weight, or less than 18.5% by weight.

[0165] Item 22 relates to at least one of the glasses according to items 1 to 21, in which the ratio of the content, in weight percent, of (a) the second most abundant alkali metal oxide to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is 0.0 to 0.4, 0.0 to 0.3, or 0.0 to 0.2.

[0166] Item 23 relates to at least one of the glasses of items 1 to 22, wherein the sum of the contents, in weight percent, of MgO and the second most abundant alkali metal oxide is less than 8.0 wt.%, less than 6.0 wt.%, or less than 4.0 wt.%.

[0167] Item 24 is a glass having the following components, in weight percent: [Table 18] wherein R2O is the sum of the amounts of alkali metal oxides and R'O is the sum of the amounts of all alkaline earth metal oxides.

[0168] Item 25 is a glass having the following components, in weight percent: [Table 19] 25. The glass of claim 1, further comprising at least one of said glasses.

[0169] Item 26 is a glass having the following components, in weight percent: [Table 20] 25. The glass of claim 1, further comprising at least one of said glasses.

[0170] Item 27 is a glass having the following components, in weight percent: [Table 21] 25. The glass of claim 1, further comprising at least one of said glasses.

[0171] Item 28 is a glass having the following components, in weight percent: [Table 22] 25. The glass of claim 1, further comprising at least one of said glasses.

[0172] Item 29 relates to at least one of the glasses of items 1 to 28, wherein the amount of ZrO2 is at least 4.5 wt.-%, at least 5.1 wt.-%, or at least 6.0 wt.-%.

[0173] Item 30 relates to at least one of the glasses of items 1 to 29, having a total amount of arsenic and antimony of less than 100 ppm.

[0174] Item 31 relates to at least one glass of items 1 to 30, having a total amount of lead and bismuth of less than 100 ppm.

[0175] Item 32 is (A) the most abundant alkali metal oxide is Na2O and, if present, the second most abundant alkali metal oxide is K2O and, if present, the third most abundant alkali metal oxide is Li2O; or (B) the most abundant alkali metal oxide is K2O, if present, the second most abundant alkali metal oxide is Na2O, and if present, the third most abundant alkali metal oxide is Li2O; 31. relating to at least one glass according to items 1 to 31

[0176] Item 33 relates to at least one of the glasses of items 1 to 32, in which the amount of alkaline earth metal oxides R'O is less than 10.0 wt.%, less than 6.0 wt.%, less than 4.0 wt.%, or less than 2.0 wt.%.

[0177] Item 34 is a glass composition comprising: a temperature T4 of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C; a temperature T3 of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C or at least 1450°C, · VFT constant A < 0.00, optionally -4.00 to -2.00; VFT constant B >5,000°C, optionally 6,000-8,000°C, and 150~550℃, e.g. 200~400℃, or VFT constant T0 up to 355℃ The present invention relates to at least one glass of items 1 to 33, which shows one or more of the following:

[0178] Item 35 relates to at least one of the glasses according to items 1 to 34, in which the ratio of (a) the sum of the contents, in weight percent, of all alkaline earth metal oxides R'O to (b) the content, in weight percent, of SiO2 is 0.0 to <0.06, <0.05, <0.04, <0.03, <0.02, or <0.01.

[0179] Item 36 relates to at least one of the glasses according to items 1 to 35, in which the ratio of (a) the sum of the contents, in weight percent, of all alkali metal oxides R2O to (b) the content, in weight percent, of SiO2 is 0.0 to <0.37, <0.35, <0.30, or <0.28.

[0180] Item 37 relates to at least one of the glasses according to items 1 to 36, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to (b) the content, in weight percent, of SiO2 is 0.08 to 0.40, 0.10 to 0.35, or 0.19 to 0.25.

[0181] Item 38 relates to at least one of the glasses according to items 1 to 37, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is 0.30 to 2.00, 0.35 to 1.80, or 0.65 to 1.25.

[0182] Item 39 relates to at least one of the glasses according to items 1 to 38, in which the sum of the contents, in weight percent, of Al2O3 and ZrO2 is 10.0 to 30.0, 15.0 to 28.0, or 22.0 to 26.0.

[0183] Item 40 is a glass having a steepness of the temperature-viscosity curve of the glass, and this steepness is determined by the temperature T4 and T 7.6 40. The glass according to claim 1, wherein the difference between the temperature of the glass and the glass temperature of the other glass is 250 to 400K, 265 to 380K, or 280 to 360K.

[0184] Item 41 relates to at least one of the glasses of items 1 to 40, in which the amount of ZrO2 is at least 6.8% by weight, or at least 7.5% by weight.

[0185] Item 42 relates to at least one of the glasses of items 1 to 41, in which the ratio of the amount, in weight percent, of ZrO2 to the amount, in weight percent, of Al2O3 is at least 0.30, or at least 0.45.

[0186] Item 43 is at least 10 μm 2 / h, at least 14μm 2 / h, or at least 18 μm 2 / h

[0187] Item 44 is up to 80 μm 2 / h, max. 70μm 2 / h, or up to 60μm 2 / h

[0188] Item 45: CSS 30μm 45. The glass of claim 1, wherein the compressive stress susceptibility, defined as a compressive stress score, is at least 600 MPa, at least 700 MPa, or at least 800 MPa.

[0189] Item 46 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - CSS 30μm The compressive stress susceptibility, defined as the score, is at least 600 MPa; - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 46. ​​The glass of claim 1, wherein the glass has at least one of the following properties:

[0190] Item 47 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - Diffusion rate of at least 18 μm 2 / h, - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 47. The glass of claim 1, wherein the glass has at least one of the following properties:

[0191] Item 48 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - 1000MPa IOX time is less than 60 minutes; - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 48. The glass of claim 1, wherein the glass has all of the above.

[0192] Item 49 has the following characteristics: - P2O5 in an amount of at least 1.0% by weight, for example 1.0-8.0% by weight; - ZnO in an amount between 0.5 and 5.0% by weight, - K2O in an amount of at least 1.0% by weight, - MgO in an amount of at least 1.0% by weight 49. The glass of claim 1, further comprising one or more of:

[0193] Item 50 contains the following components in weight percent: [Table 23] where R2O is the sum of the amounts of alkali metal oxides and R'O is the sum of the amounts of all alkaline earth metal oxides.

[0194] Item 51 is a glass having the following components, in weight percent: [Table 24] Item 50 relates to glass, including

[0195] Item 52 is a glass having the following components, in weight percent: [Table 25] wherein the total amount of Al2O3 and B2O3 is 7.0 to 22.0 wt.%, The ratio of the content of (a) ZrO2 and Y2O3 in weight percent to the content of (b) SiO2 in weight percent is 0.15 to 0.40; Relating to glass of item 50 or 51.

[0196] Item 53 is a glass having the following components, in weight percent: [Table 26] wherein the ratio of the amount of ZrO2, in weight percent, to the amount of Al2O3, in weight percent, is at least 0.50.

[0197] Item 54 is a glass having the following components, in weight percent: [Table 27] 54. The glass of claim 50, further comprising at least one of said glasses.

[0198] Item 55 is a glass having the following components, in weight percent: [Table 28] 55. The glass of claim 50, further comprising at least one of said glasses.

[0199] Item 56 is a glass transition temperature T of at least 590° C., at least 610° C., or at least 625° C. g 56. The glass of claim 50, wherein the glass has a thickness of 100 nm to 150 nm.

[0200] Item 57 is a method for the determination of CSS in a 100% KNO3 bath. 200μm 57. At least one of the glasses of items 50 to 56, having a compressive stress susceptibility, defined as a compressive stress score, of at least 800 MPa.

[0201] Item 58 is as follows: (a) a hydrolysis resistance value in μg / g sodium equivalent of less than 100, less than 60, less than 40, or less than 30; (b) mg / dm 2 Alkali resistance values ​​of less than 50, less than 40, less than 30, or less than 20 in weight loss units; (c) mg / dm 2 Acid resistance values ​​of less than 30, less than 20, less than 15, less than 10, or less than 5 in weight loss units 58. The glass of claim 50, further comprising at least one of said glasses, each of which has a chemical resistance characterized by one or more of the following:

[0202] Item 59 is the compressive stress susceptibility CSS in MPa versus the total content of alkali metal oxides R2O and alkaline earth metal oxides R'O in weight percent. 200μm59. At least one of the glasses according to items 50 to 58, wherein / ([R2O]+[R'O]) is at least 35, at least 50, at least 60, or at least 80.

[0203] Item 60 is the ease of compressive stress in MPa relative to the coefficient of thermal expansion in ppm / K in the temperature range of 20 to 300°C, i.e., CSS 200μm 59. At least one of the glasses of items 50 to 59, wherein the CTE is at least 85, at least 100, at least 110, or at least 120.

[0204] Item 61 relates to at least one glass of items 50 to 60, in which the total amount of alkali metal oxides, alkaline earth metal oxides and ZnO is less than 27.0 wt.-%.

[0205] Item 62 relates to at least one of the glasses of items 50 to 61, in which the ratio, in weight percent, of the second most abundant alkali metal oxide B to the most abundant alkali metal oxide A is less than 0.23, less than 0.22, or less than 0.18.

[0206] Item 63 relates to the glasses of item 62, in which A=Na2O and B=K2O or B=Na2O and A=K2O.

[0207] Item 64 relates to at least one of the glasses of items 50 to 63, in which the ratio of the weight of K2O to the sum of the weights of Li2O and Na2O is less than 0.23, less than 0.22, or less than 0.18.

[0208] Item 65 relates to at least one of the glasses of items 50 to 64, in which the ratio of the weight of Na2O to the sum of the weights of Li2O and K2O is less than 0.23, less than 0.22, or less than 0.18.

[0209] Item 66 relates to at least one of the glasses of items 50 to 65, wherein the ratio of the weight of SiO2 to the sum of the weights of Li2O and Na2O is less than 5.5, less than 4.9, or less than 4.5.

[0210] Item 67 is as follows: - SiO2 in an amount of at least 50.0% by weight or at least 55.0% by weight and / or K2O in an amount of less than 3.0% by weight 67. The glass of claim 50, further comprising at least one of said glasses.

[0211] Item 68 relates to at least one of the glasses of items 50 to 67, in which the sum of the Al2O3 and B2O3 contents is less than 20.5% by weight, less than 18.0% by weight, or less than 17.0% by weight.

[0212] Item 69 relates to at least one of the glasses of items 50 to 68, in which the sum of the Al2O3 and B2O3 content is at least 5.0 wt.-%, at least 7.0 wt.-%, at least 8.5 wt.-%, or at least 10.5 wt.-%.

[0213] Item 70 relates to at least one of the glasses of items 50 to 69, in which the sum of the content of all alkali metal oxides R2O is less than 20.5 wt.-%, less than 19.5 wt.-%, or less than 18.5 wt.-%.

[0214] Item 71 relates to at least one of the glasses of items 50 to 70, in which the ratio of the content, in weight percent, of (a) the second most abundant alkali metal oxide to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is 0.0 to 0.4, 0.0 to 0.3, or 0.0 to 0.2.

[0215] Item 72 relates to at least one of the glasses of items 50 to 71, wherein the sum of the contents, in weight percent, of MgO and the second most abundant alkali metal oxide is less than 8.0 wt.%, less than 6.0 wt.%, or less than 4.0 wt.%.

[0216] Item 73 is a glass having the following components, in weight percent: [Table 29] 73. The glass of claim 50, further comprising at least one of said glasses.

[0217] Item 74 is a glass having the following components, in weight percent: [Table 30] 74. The glass of claim 50, further comprising at least one of said glasses.

[0218] Item 75 is a glass having the following components, in weight percent: [Table 31] 50 to 74, comprising at least one glass of items 50 to 74.

[0219] Item 76 is a glass having the following components, in weight percent: [Table 32] 50 to 75, comprising at least one glass of any one of items 50 to 75.

[0220] Item 77 relates to at least one of the glasses of items 50 to 76, wherein the amount of ZrO2 is at least 4.5 wt.-%, at least 5.1 wt.-%, or at least 6.0 wt.-%.

[0221] Item 78 relates to at least one of the glasses of items 50 to 77, having a total amount of arsenic and antimony of less than 100 ppm.

[0222] Item 79 relates to at least one of the glasses of items 50 to 78, having a total amount of lead and bismuth of less than 100 ppm.

[0223] Item 80 is (A) the most abundant alkali metal oxide is Na2O and, if present, the second most abundant alkali metal oxide is K2O and, if present, the third most abundant alkali metal oxide is Li2O; or (B) the most abundant alkali metal oxide is K2O, if present, the second most abundant alkali metal oxide is Na2O, and if present, the third most abundant alkali metal oxide is Li2O; Item 50 to 79 relates to at least one glass.

[0224] Item 81 relates to at least one of the glasses of items 50 to 80, in which the amount of alkaline earth metal oxides R'O is less than 10.0 wt.%, less than 6.0 wt.%, less than 4.0 wt.%, or less than 2.0 wt.%.

[0225] Item 82 is a glass composition comprising: a temperature T4 of at least 1040°C, at least 1090°C, at least 1140°C, at least 1190°C, at least 1200°C, or at least 1250°C; a temperature T3 of at least 1180°C, at least 1240°C, at least 1300°C, at least 1350°C, at least 1400°C or at least 1450°C, · VFT constant A < 0.00, optionally -4.00 to -2.00; VFT constant B >5,000°C, optionally 6,000-8,000°C, and 150~550℃, e.g. 200~400℃, or VFT constant T0 up to 355℃ The present invention relates to at least one glass of items 50 to 81, which shows one or more of the following:

[0226] Item 83 relates to at least one of the glasses of items 50 to 82, in which the ratio of (a) the sum of the contents, in weight percent, of all alkaline earth metal oxides R'O to (b) the content, in weight percent, of SiO2 is 0.0 to <0.06, <0.05, <0.04, <0.03, <0.02, or <0.01.

[0227] Item 84 relates to at least one of the glasses of items 50 to 83, in which the ratio of (a) the sum of the contents, in weight percent, of all alkali metal oxides R2O to (b) the content, in weight percent, of SiO2 is 0.0 to <0.37, <0.35, <0.30, or <0.28.

[0228] Item 85 relates to at least one of the glasses of items 50 to 84, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to (b) the content, in weight percent, of SiO2 is 0.08 to 0.40, 0.10 to 0.35, or 0.19 to 0.25.

[0229] Item 86 relates to at least one of the glasses of items 50 to 85, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to the sum of the contents, in weight percent, of (b) Al2O3 and B2O3 is 0.30 to 2.00, 0.35 to 1.80, or 0.65 to 1.25.

[0230] Item 87 relates to at least one of the glasses of items 50 to 86, in which the sum of the contents, in weight percent, of Al2O3 and ZrO2 is 10.0 to 30.0, 15.0 to 28.0, or 22.0 to 26.0.

[0231] Item 88 is a glass having a steepness of the temperature-viscosity curve of the glass, and this steepness is determined by the temperature T4 and T 7.6 and the difference between the temperature and the glass temperature is 250 to 400K, 265 to 380K, or 280 to 360K.

[0232] Item 89 relates to at least one of the glasses of items 50 to 88, in which the amount of ZrO2 is at least 6.8% by weight, or at least 7.5% by weight.

[0233] Item 90 relates to at least one of the glasses of items 50 to 89, in which the ratio of the amount, in weight percent, of ZrO2 to the amount, in weight percent, of Al2O3 is at least 0.30, or at least 0.45.

[0234] Item 91 is at least 10 μm 2 / h, at least 14μm 2 / h, or at least 18 μm 2 / h

[0235] Item 92 is up to 80 μm 2 / h, max. 70μm 2 / h, or up to 60μm 2 / h

[0236] Item 93: CSS 30μm The glass of claim 50, wherein the compressive stress susceptibility, defined as a compressive stress score, is at least 600 MPa, at least 700 MPa, or at least 800 MPa.

[0237] Item 94 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - CSS 30μm The compressive stress susceptibility, defined as the score, is at least 600 MPa; - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 The present invention relates to at least one glass of items 50 to 93, wherein

[0238] Item 95 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - Diffusion rate of at least 18 μm 2 / h, - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 The present invention relates to at least one glass of items 50 to 94,

[0239] Item 94 has the following characteristics: - the amount of ZrO2 is at least 6.8% by weight; - 1000MPa IOX time is less than 60 minutes; - the ratio of the amount of ZrO2 in weight percent to the amount of Al2O3 in weight percent is at least 0.45 The present invention relates to at least one glass of items 50 to 95,

[0240] Item 95 has the following characteristics: - P2O5 in an amount of at least 1.0% by weight, for example 1.0-8.0% by weight; - ZnO in an amount between 0.5 and 5.0% by weight, - K2O in an amount of at least 1.0% by weight, - MgO in an amount of at least 1.0% by weight The glass of claim 50, further comprising one or more of the following:

[0241] Item 96 has a thermal expansion coefficient of 10.0×10 in the temperature range of 20 to 300°C. -6 K -1 Less than 9.5×10 -6 K -1 Less than 9.2 x 10 -6 K -1 Less than 8.8×10 -6 K -1 Less than 8.5×10 -6 K -1 Less than or equal to 8.2 x 10 -6 K-1 The glass of at least one of items 50 to 95,

[0242] Item 97 relates to at least one of the glasses of items 50 to 96 having a Young's modulus of at least 70 GPa, at least 74 GPa, at least 75 GPa, or at least 78 GPa.

[0243] Item 98 relates to at least one of the glasses of items 50 to 97, having a Poisson's ratio of 0.220 to 0.260, 0.225 to 0.255, or 0.230 to 0.250.

[0244] Item 99 relates to at least one of the glasses of items 50 to 98 having a 1000 MPa IOX time of less than 60 minutes.

[0245] Item 100, 2.530~2.800g / cm 3 , 2.580~2.700g / cm 3 , or 2.600~2.690g / cm 3 The present invention relates to at least one glass of items 50 to 99 having a density of

[0246] Item 101 is a glass having the following components, in weight percent: [Table 33] The present invention relates to at least one glass of items 50 to 100, including:

[0247] Item 102 is a glass having the following components, in weight percent: [Table 34] The present invention relates to at least one glass of items 50 to 101, including

[0248] Item 103 is a glass having the following components, in weight percent: [Table 35] 103. The glass of claim 50, further comprising at least one of said glasses.

[0249] Item 104 is a glass having the following components, in weight percent: [Table 36] 104. The glass of claim 50, further comprising at least one of said glasses.

[0250] Item 105 is a glass having the following components, in weight percent: [Table 37] 105. The glass of claim 104, further comprising at least one of said glasses.

[0251] Item 106 is a glass article, optionally having a thickness of 1,000 μm or less, and comprising: (A) Glass according to any one of items 1 to 49; or (B) Glass according to any one of items 50 to 105 The present invention relates to a glass article comprising or consisting of:

[0252] Item 107 relates to the glass article of item 106, having a thickness of less than 1,000 μm, less than 850 μm, less than 300 μm, less than 200 μm, or less than 100 μm.

[0253] Item 108 relates to the glass article according to items 106 or 107, having a thickness of at least 5 μm, at least 10 μm, or at least 15 μm.

[0254] Item 109 relates to the glass article of any one of items 106 to 108, having a thickness of less than 80 μm, less than 60 μm, or less than 40 μm.

[0255] Item 110 relates to the glass article according to at least one of items 106 to 109, having a warpage of less than 3.0 mm, less than 2.0 mm, or less than 1.0 mm.

[0256] Item 111 relates to a glass article according to at least one of items 106 to 110, having a total thickness variation of less than 15 μm, less than 10 μm, or less than 5 μm.

[0257] Item 112 is at least 10 cm 2 , at least 15 cm 2 , or at least 20 cm 2 112. The glass article according to claim 106, having an area of

[0258] Item 113 is 10,000 cm 2 Less than 1,000cm 2 Less than or equal to 200cm 2 113. The glass article according to at least one of items 106 to 112, having an area of ​​less than

[0259] Item 114 is a surface roughness R of 5.0 nm or less, 3.0 nm or less, or 1.5 nm or less on one or both of its major surfaces. a 114. The glass article according to claim 106, wherein the glass article has a diameter of 10 mm or less.

[0260] Item 115 shall, on one or both of its main faces, state the following: (a) a hydrolysis resistance value in μg / g sodium equivalent of less than 100, less than 60, less than 40, or less than 30; (b) mg / dm 2 Alkali resistance values ​​of less than 50, less than 40, less than 30, or less than 20 in weight loss units; (c) mg / dm 2 Acid resistance values ​​of less than 30, less than 20, less than 15, less than 10, or less than 5 in weight loss units 115. The glass article according to claim 106, further comprising a chemical resistance characterized by one or more of the following:

[0261] Item 116 relates to a glass article according to at least one of items 106 to 115, having a Vickers hardness of at least 580, at least 590, or at least 600.

[0262] Item 117 relates to a glass article according to at least one of items 106 to 116, exhibiting a three-point bending strength of at least 100 MPa, at least 200 MPa, or at least 300 MPa.

[0263] Item 118 is as follows: - thickness less than 100 μm, - CSS 30μm Glass having a compressive stress susceptibility, defined as a score, of at least 600 MPa; - Composition of the following components in weight percent: [Table 38] 118. The glass article according to at least one of items 106 to 117,

[0264] Item 119 is as follows: - thickness less than 100 μm, - Diffusion rate of at least 18μm 2 / h, - Composition of the following components in weight percent: [Table 39] Item 119. The glass article according to at least one of items 106 to 118,

[0265] Item 120 relates to a glass article according to at least one of items 106 to 119, comprising an ion exchange layer on one or both of its major surfaces.

[0266] Item 121 relates to the glass article of item 120 having a compressive stress on one or both of its major surfaces of at least 400 MPa, at least 700 MPa, at least 800 MPa, or at least 900 MPa.

[0267] Item 122 relates to the glass article according to items 120 or 121, having on one or both of its main surfaces a ratio of compressive stress in MPa to the thickness of the article in μm of at least 4.0, at least 5.0, or at least 6.0.

[0268] Item 123 relates to a glass article according to at least one of items 120 to 122, having a ratio of compressive stress in MPa to depth of the ion exchange layer in μm on one or both of its main surfaces of at least 50, at least 75, or at least 90.

[0269] Item 124 relates to a glass article according to at least one of items 120 to 123, exhibiting a three-point bending strength of at least 400 MPa, at least 500 MPa, or at least 600 MPa.

[0270] Item 125 relates to a glass article according to at least one of items 120 to 124, having a thickness of 20 to 40 μm, for example 25 to 35 μm, and having a compressive stress on one or both of its main surfaces of at least 800 MPa, at least 850 MPa, or at least 900 MPa.

[0271] Item 126 relates to a glass article according to at least one of items 120 to 125, having a DoL of 6 to 12 μm, or 7 to 11 μm, on one or both of its major surfaces.

[0272] Item 127 relates to a glass article according to at least one of items 120 to 126, having a DoL of at least 6 μm, at least 7 μm, or at least 8 μm.

[0273] Item 128 relates to a glass article according to at least one of items 120 to 127, having a DoL of at most 15 μm, at most 13 μm, at most 12 μm, or at most 11 μm.

[0274] Item 129 relates to a glass article according to at least one of items 120 to 128, having a DoL of 15% to 25% of the article thickness, or 16% to 20% of the article thickness.

[0275] Item 130 relates to a glass article according to at least one of items 120 to 129, having a DoL of at least 15% of the article thickness, at least 16% of the article thickness, or at least 17% of the article thickness.

[0276] Item 131 relates to a glass article according to at least one of items 120 to 130, having a DoL of at most 33%, at most 25%, or at most 20% of the thickness of the article.

[0277] Item 132 is as follows: - thickness less than 100 μm, - Composition of the following components in weight percent: [Table 40] 132. The glass article according to claim 120, wherein the glass article has a diameter of 100 mm or less.

[0278] Item 133 is as follows: - thickness less than 80 μm, - Composition of the following components in weight percent: [Table 41] 133. The glass article according to claim 120, wherein the glass article has a diameter of 1 mm or less.

[0279] Item 134 is as follows: - thickness less than 60 μm, - Composition of the following components in weight percent: [Table 42] 134. The glass article according to claim 120, wherein the glass article has a diameter of 100 mm or less.

[0280] Item 135 is as follows: - thickness less than 80 μm, - DoL of 6 to 12 μm, - Composition of the following components in weight percent: [Table 43] 135. The glass article according to claim 120, wherein the glass article has a diameter of 100 mm or less.

[0281] Item 136 is as follows: (A) a glass according to any one of items 1 to 49; (B) Glass according to any one of items 50 to 105; (C) a glass article according to any one of items 106 to 119, and / or (D) Glass articles according to items 120 to 135 The present invention relates to an electronic device comprising:

[0282] Item 137 includes a display, the display displaying: (A) a glass according to any one of items 1 to 49; (B) Glass according to any one of items 50 to 105; (C) a glass article according to any one of items 106 to 119, and / or (D) Glass articles according to items 120 to 135 The electronic device according to item 136, further comprising:

[0283] Item 138 relates to the electronic device according to item 136 or 137, wherein the electronic device is a foldable device, such as a foldable smartphone or tablet computer.

[0284] Item 139 contains the following components in weight percent: [Table 44] where R'O is the sum of the amounts of all alkaline earth metal oxides.

[0285] Item 140 relates to the glass according to item 139, wherein the amount of ZrO2 is at least 5.0 wt.%.

[0286] Item 141 relates to the glass according to item 139, wherein the amount of ZrO2 is at least 5.1 wt.-%.

[0287] Item 142 relates to the glass according to at least one of items 139 to 141, wherein the glass does not contain BaO.

[0288] Item 143 relates to the glass according to at least one of items 139 to 142, in which the glass comprises SiO2 in an amount of up to 64.0% by weight.

[0289] Item 144 relates to the glass according to at least one of items 139 to 143, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to (b) the content, in weight percent, of SiO2 is at least 0.08.

[0290] Item 145 relates to the glass according to at least one of items 139 to 144, in which the ratio of (a) the sum of the contents, in weight percent, of ZrO2 and Y2O3 to (b) the sum of the contents, in weight percent, of Al2O3 and B2O3 is at least 0.30.

[0291] Item 146 relates to the glass according to at least one of items 139 to 145, wherein the glass comprises MgO in an amount of at least 0.5% by weight.

[0292] Item 147 is a graph showing the effect of heat treatment of glass in a gradient furnace for 16 hours in a temperature-increasing regime. 5 147. The glass according to at least one of items 139 to 146, having a crystal growth rate of at most 0.5 μm / min at a viscosity of 100 dPas.

[0293] Item 148 relates to the glass according to at least one of items 139 to 147, in which the amount of Li2O is at most 0.5% by weight.

[0294] Item 149 relates to the glass according to at least one of items 139 to 148, in which the sum of R'O+ZnO is 13.0% by weight or less.

[0295] Item 150 relates to the glass according to at least one of items 139 to 149, in which the Al2O3 content is in the range of 5.0 to 16.0% by weight.

[0296] Working Example Exemplary compositions of glasses according to the invention were produced by melting appropriate glass raw materials. The following table summarizes the composition and properties of these glasses.

[0297] 1. Test Composition [Table 45]

[0298] [Table 46]

[0299] 2. Ion exchange treatment Thin glass sheets were produced from compositions 1-4 and 6-8. The thickness of the sheets was 200 μm. The sheets were then subjected to an ion-exchange treatment in a 100% KNO3 salt bath at 440°C for 30 minutes. The resulting compressive stress and depth of ion-exchange layer (DoL) are shown in the table below.

[0300] [Table 47]

[0301] 3. Mechanical Testing The articles having compositions 1 and 2 were tested for hardness and three-point bending (3PB) strength. Vickers hardness tests were performed on the articles without the ion-exchange layer. Three-point bending tests were performed on both the non-ion-exchanged articles and the compressive stressed glass articles having the compositions of Example 1 (CS=1239 MPa, DoL=10.0 μm) and Example 2 (CS=1431 MPa, DoL=14.6 μm) with a thickness of 200 μm, respectively. The results are shown below.

[0302] [Table 48]

[0303] 4. Further Compositions The following compositions are within the scope of this disclosure. The totals of the individual components in the table may add up to slightly more or less than 100%, which may be due to rounding. Fining agents such as 0.1% SnO2 and 0.2 Cl are not shown in the table below.

[0304] [Table 49]

[0305] [Table 50]

[0306] [Table 51]

[0307] [Table 52]

[0308] 5.Chemical resistance The hydrolytic resistance was tested according to ISO 719. The alkali resistance was measured according to ISO 695 and the acid resistance was tested according to DIN 12116. The results are shown in the table below.

[0309] [Table 53]

[0310] 6. Further Test Compositions Further exemplary compositions of glasses were produced by melting appropriate glass raw materials. The following table summarizes the compositions and properties of these glasses.

[0311] [Table 54]

[0312] [Table 55]

[0313] [Table 56]

[0314] 7.Ion exchange treatment Thin glass sheets were produced from compositions 9-11, 28, 30-35, 37-40, and 42-49. The thickness of the sheets was 200 μm. The sheets were then subjected to an ion exchange treatment in a 100% KNO3 salt bath at 440° C. for 30 minutes. The resulting compressive stress and depth of ion exchange layer (DoL) are shown in the table below.

[0315] [Table 57]

[0316] [Table 58]

[0317] [Table 59]

[0318] 8. Mechanical Testing Articles having compositions 1, 3, 4, 6-11, 28, 30, 32-35, 37, 38 and 40 were tested for three-point bend (3PB) strength. Three-point bend tests were performed with the ion-exchanged articles at the compressive stresses and DoLs shown in the table below. The thickness of the articles was 500 μm. The results are shown in the table below.

[0319] [Table 60]

[0320] [Table 61]

[0321] [Table 62]

[0322] 9. Devitrification For compositions 1, 5, 7, 34, 37, 40 to 44, 46, 48 and 49, 10 5 The devitrification resistance was determined as the crystal growth rate (μm / min) at a viscosity in dPas. The lower the crystal growth rate, the higher the devitrification resistance. Methods for measuring the crystal growth rate are well known. The crystal growth rate is measured along the formed crystals, i.e. at their greatest extension.

[0323] Briefly, the crystal growth rate was determined by heat treating the glasses in a gradient furnace for 16 h at an increasing temperature regime. 5 If no devitrification occurs at a viscosity of 10 dPas, 5The problem is that it is not possible to determine the crystal growth rate at 10 dPas. 5 It can also be expressed as a crystal growth rate of 0 μm / min at dPas.

[0324] The crystallization rate was determined using glass particles with a diameter of about 2 mm to 3 mm. The glass particles were placed on a platinum support for gradient heat treatment. The support was provided with depressions to capture the glass particles, and holes for optical inspection were provided at the bottom of each depression, so that the crystal growth rate was determined under a microscope. The diameter of each depression was 2 mm, and the diameter of each hole was 0.9 mm.

[0325] The results are shown in the table below.

[0326] [Table 63]

Claims

1. below: i. SiO ２ 、 ii. Al in a total amount of 5.0 to 25.0 wt. % ２ O ３ and / or B ２ O ３ , ii. ZrO in a total amount of at least 3.0 wt.% ２ and / or Y ２ O ３ , iii. ZnO, Li in a total amount of 10.0 to 40.0 wt. % ２ O, Na ２ O.K. ２ one or more oxides selected from O, MgO, CaO, SrO, BaO, and combinations thereof; and iv. Optionally, P ２ O ５ and TiO ２ One or more ingredients selected from Including glass.

2. The thermal expansion coefficient in the temperature range of 20 to 300°C is 10.0 x 10 －６ K －１ Less than 9.5 x 10 －６ K －１ Less than 9.2 x 10 －６ K －１ Less than 8.8 x 10 －６ K －１ Less than 8.5 x 10 －６ K －１ Less than or equal to 8.2 x 10 －６ K －１ The glass of claim 1 , wherein the tensile strength is less than 1000 MPa.

3. SiO in an amount of at least 50.0 wt. % or at least 55.0 wt. % ２ and / or K in an amount of less than 3.0 wt.% ２ O The glass of claim 1 comprising:

4. CSS ３０μｍ 2. The glass of claim 1, wherein the glass has a compressive stress susceptibility, defined as a score, of at least 800 MPa.

5. ZrO ２ 10. The glass of claim 1, wherein the amount of is at least 6.8 wt.%, or >10.0 wt.%.

6. Al ２ O ３ ZrO in terms of the amount in weight percent ２ 2. The glass of claim 1, wherein the ratio of the amounts in weight percent of

7. 10. The glass of claim 1, wherein the 1000 MPa IOX time is less than 60 minutes.

8. A glass transition temperature T of at least 590°C, at least 610°C, or at least 625°C ｇ 10. The glass of claim 1, wherein

9. The glass has a steepness of the temperature-viscosity curve of the glass, and the steepness is ４ and T ７．６ 2. The glass according to claim 1, wherein the difference between the temperature and the temperature is 250 to 400K.

10. The glass has a thickness of at least 10 μm ２ / h, or at least 18 μm ２ 2. The glass of claim 1, wherein the glass has a diffusivity of 0.15 to 0.25 wt %.

11. 10. The glass of claim 1, wherein the glass has a combined amount of alkaline earth metal oxides and ZnO of 15.0 wt.% or less.

12. The glass contains alkali metal oxides, and the alkali metal oxide contained in the glass in the largest amount is Li ２ 2. The glass of claim 1, wherein the crystalline structure is not O.

13. ZrO ２ 2. The glass of claim 1, wherein the amount of is at least 4.5 wt.%.

14. When the glass was heat treated in a gradient furnace for 16 hours in a temperature-rising regime, ５ 2. The glass of claim 1, which has a crystal growth rate of at most 0.5 μm / min at a viscosity of 0.05 dPas.

15. A glass article comprising or consisting of the glass of claim 1.

16. 16. The glass article of claim 15, having a thickness of less than 100 μm, less than 80 μm, less than 60 μm, or less than 40 μm.

17. 16. The glass article of claim 15, comprising an ion-exchange layer on one or both major surfaces of the glass article.

18. 18. The glass article of claim 17, having a compressive stress of at least 400 MPa, at least 700 MPa, or at least 800 MPa on one or both of the major surfaces of the glass article.

19. 18. The glass article of claim 17, wherein the ratio of compressive stress in MPa to article thickness in μm on one or both major surfaces of the glass article is at least 4.0, at least 5.0, or at least 20.

0.

20. 18. The glass article of claim 17, wherein the ratio of compressive stress in MPa to the depth of the ion exchange layer in μm on one or both of the major surfaces of the glass article is at least 50, at least 75, or at least 90.

21. An electronic device comprising the glass according to any one of claims 1 to 14 and / or the glass article according to any one of claims 15 to 20.