Ion-exchangeable alkali aluminosilicate glass compositions with improved mechanical durability - Patents.com

Abstract

The glass composition contains 50.0 mol% to 70.0 mol% SiO2; 10.0 mol% to 25.0 mol% Al2O3; 0.0 mol% to 5.0 mol% P2O3; 0.0 mol% to 10.0 mol% B2O3; 5.0 mol% to 15.0 mol% Li2O; 1.0 mol% to 15.0 mol% Na2O; and 0.0 mol% to 1.0 mol% K2O. The total R2O of all alkali oxides present in the glass composition may be in the range of 11.0 mol% to 23.0 mol%. The total of Al2O3 and R2O present in the glass composition may be in the range of 26.0 mol% to 40.0 mol%. The glass composition may satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority under 35 U.S.C. § 119 of U.S. Provisional Patent Application No. 63 / 055,274, filed July 22, 2020, and U.S. Provisional Patent Application No. 62 / 940,452, filed November 26, 2019, the contents of each of which are relied upon and incorporated herein by reference in their entirety. [Technical Field]

[0002] FIELD OF THE INVENTION This specification relates generally to ion-exchangeable glass compositions, and more particularly to ion-exchangeable alkali aluminosilicate glass compositions with improved mechanical durability. [Background technology]

[0003] Due to their portability, portable devices such as smartphones, tablets, portable media players, personal computers, and cameras are particularly vulnerable to accidental drops onto hard surfaces, such as the ground. These devices typically incorporate a cover glass that can be damaged when struck by a hard surface. In many of these devices, the cover glass functions as a display cover and may incorporate touch functionality, which can adversely affect the use of the device if the cover glass is damaged.

[0004] Furthermore, it is desirable that the glass used as the cover glass of a mobile device be as thin as possible. Summary of the Invention [Problem to be solved by the invention]

[0005] Thus, there is a need for glasses that can be strengthened, such as by ion exchange, and that have mechanical properties that allow them to be formed into thin glass articles. [Means for solving the problem]

[0006] According to aspect A1, the glass composition comprises 50.0 mol% or more and 70.0 mol% or less of SiO2; 10.0 mol% or more and 25.0 mol% or less of Al2O3; 0.0 mol% or more and 5.0 mol% or less of P2O3; 0.0 mol% or more and 10.0 mol% or less of B2O3; 5.0 mol% or more and 15.0 mol% or less of Li2O; 1.0 mol% or more and 15.0 mol% or less of Na2O; and 0.0 mol% or more and 1.0 mol% or less of Na2O. 0.0 mol% or less of K2O, where R2O is in the range of 11.0 mol% or more and 23.0 mol% or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 26.0 mol% or more and 40.0 mol% or less; and -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3 (RO is the total alkaline earth metal oxides in the glass composition).

[0007] The second aspect A2 includes the glass composition according to the first aspect A1, in which R2O is in the range of 15.0 mol % or more and 19.0 mol % or less.

[0008] The third aspect A3 includes the glass composition according to the first and second aspects A1-A2, in which Al2O3+R2O is in the range of 28.0 mol % or more and 36.0 mol % or less.

[0009] A fourth aspect A4 includes a glass composition according to any of the first to third aspects A1-A3, wherein 0.0≦(Al 2 O 3 −(R 2 O+RO)) / Li 2 O≦0.1.

[0010] A fifth aspect A5 comprises a glass composition according to any of the first to fourth aspects A1-A4, wherein 0.9≦Al 2 O 3 / (R 2 O+RO)≦1.1.

[0011] A sixth aspect A6 includes a glass composition according to any of the first to fifth aspects A1-A5, wherein Al2O3 + R2O + B2O3 is 32.0 mol% or greater.

[0012] A seventh aspect A7 includes a glass composition according to any of the first to sixth aspects A1-A6, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0013] An eighth embodiment A8 comprises a glass composition according to the seventh embodiment A7, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0014] A ninth embodiment A9 comprises a glass composition according to the eighth embodiment A8, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0015] A tenth aspect A10 comprises a glass composition according to any of the first to ninth aspects A1-A9, further comprising up to 5.0 mol % MgO.

[0016] An eleventh embodiment A11 comprises a glass composition according to any one of the first to tenth embodiments A1-A10, further comprising 0.0 mol % to 2.0 mol % TiO2.

[0017] A twelfth embodiment A12 comprises a glass composition according to any one of the first to eleventh embodiments A1-A11, further comprising 0.0 mol % to 1.0 mol % SnO2.

[0018] A thirteenth embodiment A13 comprises a glass composition according to any of the first to twelfth embodiments A1-A12, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0019] A fourteenth embodiment A14 comprises a glass composition according to any of the first to twelfth embodiments A1-A12, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0020] A fifteenth embodiment A15 comprises a glass composition according to any of the first to twelfth embodiments A1-A12, wherein Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0021] A sixteenth aspect A16 includes a glass composition according to any one of the first to fifteenth aspects A1-A15, in which the glass composition has a density in the range of 2.20 or more and 2.60 or less.

[0022] A seventeenth aspect A17 includes a glass composition according to any one of the first to sixteenth aspects A1-A16, in which the glass composition has a liquidus viscosity in the range of 5.0 kP or more and 175.0 kP or less.

[0023] An eighteenth aspect A18 includes a glass composition according to any one of the first to seventeenth aspects A1 to A17, in which the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0024] A nineteenth embodiment A19 includes the glass composition according to the eighteenth embodiment A18, in which the glass composition has a softening point in the range of 750.0°C or higher and 925.0°C or lower.

[0025] A twentieth embodiment A20 includes a glass composition according to a nineteenth embodiment A19, in which the glass composition has a softening point in the range of 790.0°C or higher and 910.0°C or lower.

[0026] A twenty-first aspect A21 includes a glass composition according to any of the first to seventeenth aspects A1-A17, wherein the glass composition has a softening point of 900.0° C. or less.

[0027] A twenty-second embodiment A22 includes a glass composition according to the twenty-first embodiment A21, wherein the glass composition has a softening point of 875.0° C. or less.

[0028] A twenty-third embodiment A23 includes a glass composition according to the twenty-second embodiment A22, wherein the glass composition has a softening point of 860.0°C or less.

[0029] The 24th aspect A24 is a glass composition having a K of 0.70 or more as measured by a chevron notched short bar method. 1C The present invention also includes a glass-based article having a glass composition according to any of the first to twenty-third aspects A1-A23, wherein the glass composition has fracture toughness.

[0030] The 25th aspect A25 is a glass composition having a K of 0.73 or more as measured by the chevron notched short bar method. 1C The glass-based article according to twenty-fourth aspect A24 has fracture toughness.

[0031] A twenty-sixth aspect A26 includes a glass-based article having a glass composition according to any of the first through twenty-fifth aspects A1-A25, wherein the glass composition is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0032] A twenty-seventh aspect A27 includes the glass-based article according to the twenty-sixth aspect A26, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C or more and 500.0°C or less for a time period of 2 hours or more and 12 hours or less.

[0033] A twenty-eighth embodiment A28 includes the glass-based article according to the twenty-seventh embodiment A27, wherein the ion exchange bath further comprises NaNO 3 .

[0034] A twenty-ninth embodiment, A29, includes the glass-based article according to any of the twenty-sixth to twenty-eighth embodiments, A26-A28, wherein the glass-based article being strengthened has a compressive stress of 600 MPa or greater.

[0035] A thirtieth embodiment, A30, includes the glass-based article according to any of the twenty-sixth to twenty-ninth embodiments, A26-A29, wherein the glass-based article being strengthened has a maximum central tension of 20.0 MPa or greater.

[0036] A thirty-first embodiment, A31, includes the glass-based article according to the thirtieth embodiment, A30, wherein the glass-based article being strengthened has a maximum central tension of 60.0 MPa or greater.

[0037] A thirty-second embodiment, A32, includes a glass-based article according to any of the twenty-sixth through thirty-first embodiments, A26-A31, wherein the glass-based article being strengthened has a compression depth of 0.15t or greater, where t is the thickness of the glass-based article being strengthened.

[0038] A thirty-third embodiment, A33, includes the glass-based article according to the thirty-second embodiment, A32, wherein the glass-based article being strengthened has a compression depth of 0.18t or greater.

[0039] A thirty-fourth embodiment, A34, includes the glass-based article according to any of the twenty-sixth to thirty-third embodiments, A26-A33, wherein the glass-based article being strengthened has a depth of layer of 5.0 μm or greater.

[0040] A thirty-fifth embodiment, A35, includes the glass-based article according to the thirty-fourth embodiment, A34, wherein the glass-based article being strengthened has a depth of layer of 10.0 μm or greater.

[0041] A thirty-sixth embodiment, A36, includes a glass-based article according to any of the twenty-sixth to twenty-eighth embodiments, A26-A28, wherein the glass-based article being tempered has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater (where t is the thickness of the glass-based article being tempered), and a depth of layer of 5.0 μm or greater.

[0042] A thirty-seventh embodiment, A37, includes a glass-based article according to the thirty-sixth embodiment, A36, wherein the glass being tempered has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0043] A thirty-eighth embodiment, A38, includes the glass-based article according to any one of the twenty-sixth to thirty-seventh embodiments, A26-A37, in which the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0044] A thirty-ninth embodiment, A39, includes the glass-based article according to any of the twenty-sixth through thirty-seventh embodiments, A26-A37, wherein the glass-based article being strengthened has a Knoop scratch threshold of 9.0 N or greater.

[0045] A fortieth embodiment, A40, includes the glass-based article according to any of the twenty-sixth to thirty-ninth embodiments, A26-A39, wherein the glass-based article being strengthened has a breakage height of 100.0 cm or greater, measured on a glass-based article having a thickness of 0.5 mm according to the drop test method on 180 grit sandpaper.

[0046] A forty-first embodiment, A41, includes the glass-based article according to the fortieth embodiment, A40, wherein the glass-based article that is strengthened has a breakage height of 120.0 cm or greater.

[0047] A forty-second embodiment, A42, includes the glass-based article according to the forty-first embodiment, A41, wherein the glass-based article that is strengthened has a breakage height of 150.0 cm or greater.

[0048] A forty-third embodiment, A43, includes the glass-based article according to any of the twenty-sixth to thirty-ninth embodiments, A26-A39, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater, measured on a glass-based article having a thickness of 0.6 mm according to the drop test method on 180 grit sandpaper.

[0049] A forty-fourth embodiment, A44, includes the glass-based article according to the forty-third embodiment, A43, wherein the glass-based article that is strengthened has a breakage height of 180.0 cm or greater.

[0050] A forty-fifth embodiment, A45, includes the glass-based article according to the forty-fourth embodiment, A44, wherein the glass-based article that is strengthened has a breakage height of 200.0 cm or greater.

[0051] A forty-sixth embodiment, A46, includes a glass-based article according to any of the twenty-sixth to forty-fifth embodiments, A26-A45, wherein the glass-based article being strengthened has a residual strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0052] A forty-seventh embodiment, A47, includes the glass-based article according to the forty-sixth embodiment, A46, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0053] A forty-eighth embodiment, A48, includes the glass-based article according to the forty-seventh embodiment, A47, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0054] A forty-ninth embodiment, A49, includes the glass-based article according to any of the twenty-sixth to forty-fifth embodiments, A26-A45, wherein the glass-based article being strengthened has a residual strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0055] A fiftieth embodiment, A50, includes the glass-based article according to the forty-ninth embodiment, A49, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0056] A fifty-first embodiment, A51, includes the glass-based article according to the fiftieth embodiment, A50, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0057] A fifty-second embodiment, A52, includes a glass-based article according to any of the twenty-sixth to forty-fifth embodiments, A26-A45, wherein the glass-based article being strengthened has a residual strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0058] A fifty-third embodiment, A53, includes the glass-based article according to the fifty-second embodiment, A52, wherein the tempered glass-based article has a residual strength of 220.0 MPa or greater.

[0059] A fifty-fourth embodiment, A54, includes the glass-based article according to the fifty-third embodiment, A53, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0060] A fifty-fifth embodiment A55 includes a consumer electronic device comprising: a housing having a front, a back, and sides; and an electrical component disposed at least partially within the housing, the electrical component comprising at least a controller, a memory, and a display, the display being disposed on or adjacent to the front of the housing; and a glass composition or glass-based article according to any of the first through fifty-fourth embodiments A1-A54 is disposed over the display, forms part of the housing, or is disposed over the display and forms part of the housing.

[0061] According to a fifty-sixth aspect A56, the glass composition comprises 55.0 mol% or more and 65.0 mol% or less of SiO2; 14.0 mol% or more and 20.0 mol% or less of Al2O3; 0.0 mol% or more and 3.0 mol% or less of P2O3; 1.0 mol% or more and 7.0 mol% or less of B2O3; 5.0 mol% or more and 10.0 mol% or less of Li2O; 5.0 mol% or more and 10.0 mol% or less of Na2O; and 0.0 mol% or more and 1.0 mol% or less of Li2O. 0.0 mol% or less of K2O, where R2O is in the range of 13.0 mol% or more and 20.0 mol% or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 28.0 mol% or more and 40.0 mol% or less; and -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3 (RO is the total alkaline earth metal oxides in the glass composition).

[0062] A fifty-seventh embodiment A57 includes the glass composition according to the fifty-sixth embodiment A56, in which R2O is in the range of 15.0 mol % or more and 18.0 mol % or less.

[0063] A fifty-eighth embodiment A58 includes a glass composition according to the fifty-sixth embodiment A56 or the fifty-seventh embodiment A57, in which Al2O3+R2O is in the range of 32.0 mol % or more and 36.0 mol % or less.

[0064] A fifty-ninth embodiment, A59, comprises a glass composition according to any of the fifty-sixth to fifty-eighth embodiments, A56-A58, wherein 0.0≦(Al 2 O 3 −(R 2 O+RO)) / Li 2 O≦0.1.

[0065] A sixtieth embodiment, A60, comprises a glass composition according to any of the fifty-sixth to fifty-ninth embodiments, A56-A59, wherein 0.9≦Al 2 O 3 / (R 2 O + RO)≦1.1.

[0066] A sixty-first embodiment A61 comprises a glass composition according to any of the fifty-sixth to sixtieth embodiments A56-A60, in which Al2O3 + R2O + B2O3 is 32.0 mol% or greater.

[0067] A62 embodiment A62 includes a glass composition according to any of the 56th to 61st embodiments A56-A61, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0068] A sixty-third embodiment A63 comprises a glass composition according to the sixty-second embodiment A62, in which (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0069] A sixty-fourth embodiment A64 comprises a glass composition according to the sixty-third embodiment A63, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0070] A sixty-fifth embodiment, A65, comprises a glass composition according to any of the fifty-sixth to sixty-fourth embodiments, A56-A64, further comprising up to 3.0 mol % MgO.

[0071] A sixty-sixth embodiment, A66, comprises a glass composition according to any of the fifty-sixth to sixty-fifth embodiments, A56-A65, further comprising 0.0 mol % to 1.0 mol % TiO2.

[0072] A sixty-seventh embodiment, A67, comprises a glass composition according to any one of the fifty-sixth to sixty-sixth embodiments, A56-A66, further comprising 0.0 mol % to 1.0 mol % SnO2.

[0073] A sixty-eighth embodiment, A68, comprises a glass composition according to any of the fifty-sixth to sixty-seventh embodiments, A56-A67, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0074] A sixty-ninth embodiment, A69, comprises a glass composition according to any of the fifty-sixth to sixty-seventh embodiments, A56-A67, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0075] A seventieth embodiment, A70, comprises a glass composition according to any of the fifty-sixth to sixty-seventh embodiments, A56-A67, wherein Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0076] A seventy-first embodiment A71 includes a glass composition according to any one of the fifty-sixth to seventieth embodiments A56-A70, in which the glass composition has a density in the range of 2.20 or more and 2.60 or less.

[0077] A seventy-second embodiment A72 includes a glass composition according to any one of the fifty-sixth to seventy-first embodiments A56-A71, in which the glass composition has a liquidus viscosity in the range of 5.0 kP or more and 150.0 kP or less.

[0078] A seventy-third embodiment A73 includes the glass composition according to any one of the fifty-sixth to seventy-second embodiments A56-A72, in which the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0079] A seventy-fourth embodiment A74 includes the glass composition according to the seventy-third embodiment A73, in which the glass composition has a softening point in the range of 750.0°C or higher and 925.0°C or lower.

[0080] A seventy-fifth embodiment A75 includes the glass composition according to the seventy-fourth embodiment A74, in which the glass composition has a softening point in the range of 790.0°C or higher and 910.0°C or lower.

[0081] A seventy-sixth embodiment, A76, includes a glass composition according to any of the fifty-sixth through seventy-second embodiments, A56-A72, wherein the glass composition has a softening point of 900.0° C. or less.

[0082] A seventy-seventh embodiment, A77, includes a glass composition according to the seventy-sixth embodiment, A76, wherein the glass composition has a softening point of 875.0° C. or less.

[0083] A seventy-eighth embodiment, A78, includes a glass composition according to the seventy-seventh embodiment, A77, wherein the glass composition has a softening point of 860.0° C. or less.

[0084] The 79th aspect A79 is a glass-based article having a K of 0.70 or more as measured by the chevron notched short bar method. 1C The glass-based article has a glass composition according to any of aspects A56-A78, having fracture toughness.

[0085] The 80th aspect A80 is a glass composition having a K of 0.73 or more as measured by the chevron notched short bar method. 1C The glass-based article according to seventy-ninth embodiment A79 has fracture toughness.

[0086] An eighty-first embodiment, A81, includes a glass-based article having a glass composition according to any of the fifty-sixth to seventy-eighth embodiments, A56-A78, wherein the glass composition is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0087] An 82nd embodiment A82 includes a glass-based article according to an 81st embodiment A81, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C or more and 500.0°C or less for a time of 2 hours or more and 12 hours or less.

[0088] An eighty-third embodiment A83 includes the glass-based article according to the eighty-second embodiment A82, wherein the ion exchange bath further comprises NaNO 3 .

[0089] An eighty-fourth embodiment, A84, includes the glass-based article according to any of the eighty-first through eighty-third embodiments, A81-A83, wherein the glass-based article being strengthened has a compressive stress of 600.0 MPa or greater.

[0090] An eighty-fifth embodiment, A85, includes the glass-based article according to any of the eighty-first through eighty-fourth embodiments, A81-A84, wherein the glass-based article being strengthened has a maximum central tension of 20.0 MPa or greater.

[0091] An eighty-sixth embodiment, A86, includes the glass-based article according to the eighty-fifth embodiment, A85, wherein the glass-based article being strengthened has a maximum central tension of 60.0 MPa or greater.

[0092] An eighty-seventh embodiment, A87, includes a glass-based article according to any of the eighty-first to eighty-sixth embodiments, A81-A86, wherein the glass-based article being strengthened has a compression depth of 0.15t or greater, where t is the thickness of the glass-based article being strengthened.

[0093] An eighty-eighth embodiment, A88, includes the glass-based article according to the eighty-seventh embodiment, A87, wherein the glass-based article being strengthened has a compression depth of 0.18t or greater.

[0094] An eighty-ninth embodiment, A89, includes the glass-based article according to any of the eighty-first to eighty-eighth embodiments, A81-A88, wherein the glass-based article being strengthened has a depth of layer of 5.0 μm or greater.

[0095] A ninetieth embodiment, A90, includes the glass-based article according to the eighty-ninth embodiment, A89, wherein the glass-based article being strengthened has a depth of layer of 10.0 μm or greater.

[0096] A 91st embodiment A91 includes a glass-based article according to any of the 81st to 83rd embodiments A81-A83, wherein the glass-based article being tempered has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater (where t is the thickness of the glass-based article being tempered), and a depth of layer of 5.0 μm or greater.

[0097] A ninety-second embodiment, A92, includes a glass-based article according to the ninety-first embodiment, A91, wherein the glass being tempered has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0098] A ninety-third embodiment A93 includes the glass-based article according to any one of the eighty-first to ninety-second embodiments A81-A92, in which the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0099] A ninety-fourth embodiment, A94, includes the glass-based article according to any of the eighty-first through ninety-second embodiments, A81-A92, wherein the glass-based article being strengthened has a Knoop scratch threshold of 9.0 N or greater.

[0100] A ninety-fifth embodiment, A95, includes the glass-based article according to any of the eighty-first to ninety-fourth embodiments, A81-A94, wherein the glass-based article being strengthened has a breakage height of 100.0 cm or greater, measured on a glass-based article having a thickness of 0.5 mm according to the drop test method on 180 grit sandpaper.

[0101] A ninety-sixth embodiment, A96, includes the glass-based article according to the ninety-fifth embodiment, A95, wherein the glass-based article that is strengthened has a breakage height of 120.0 cm or greater.

[0102] A ninety-seventh embodiment, A97, includes the glass-based article according to the ninety-sixth embodiment, A96, wherein the glass-based article that is strengthened has a breakage height of 150.0 cm or greater.

[0103] A ninety-eighth embodiment, A98, includes the glass-based article according to any of the eighty-first to ninety-fourth embodiments, A81-A94, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater, measured on a glass-based article having a thickness of 0.6 mm according to the drop test method on 180 grit sandpaper.

[0104] A ninety-ninth embodiment, A99, includes the glass-based article according to the ninety-eighth embodiment, A98, wherein the glass-based article that is strengthened has a breakage height of 180.0 cm or greater.

[0105] A hundredth embodiment A100 includes a glass-based article according to a ninety-ninth embodiment A99, wherein the glass-based article being strengthened has a breakage height of 200.0 cm or greater.

[0106] A hundred-first embodiment A101 according to any of the eighty-first to hundredth embodiments A81-A100, wherein the glass-based article being strengthened has a residual strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0107] A hundred-second embodiment A102 includes the glass-based article according to the hundred-first embodiment A101, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0108] A hundred-third embodiment A103 comprises a glass composition according to the hundred-second embodiment A102, wherein the glass-based article being strengthened has a residual strength of 200.0 MPa or greater.

[0109] A hundred-fourth embodiment, A104, includes the glass-based article according to any of the eighty-first to hundredth embodiments, A81-A100, wherein the glass-based article being strengthened has a residual strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0110] A hundred-fifth embodiment A105 includes the glass-based article according to the hundred-fourth embodiment A104, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0111] A hundred and sixth embodiment A106 includes the glass-based article according to the hundred and fifth embodiment A105, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0112] A hundred seventh embodiment, A107, includes the glass-based article according to any of the eighty-first to hundredth embodiments, A81-A100, wherein the glass-based article being strengthened has a residual strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0113] A hundred eighth embodiment A108 includes the glass-based article according to the hundred seventh embodiment A107, wherein the tempered glass-based article has a residual strength of 220.0 MPa or greater.

[0114] A hundred-ninth embodiment A109 includes the glass-based article according to the hundred-eighth embodiment A108, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0115] A 110th embodiment A110 includes a consumer electronic device comprising: a housing having a front, a back, and sides; and an electrical component disposed at least partially within the housing, the electrical component comprising at least a controller, a memory, and a display, the display being disposed on or adjacent to the front of the housing, and wherein the glass composition or glass-based article of any of 56 to 109 embodiments A56-A109 is disposed over the display, forms part of the housing, or is disposed over the display and forms part of the housing.

[0116] 111. A glass composition comprising: 55.0 mol% or more and 63.0 mol% or less of SiO2; 15.0 mol% or more and 19.0 mol% or less of Al2O3; 0.5 mol% or more and 2.5 mol% or less of P2O3; 2.0 mol% or more and 6.0 mol% or less of B2O3; 6.0 mol% or more and 10.0 mol% or less of Li2O; 6.0 mol% or more and 10.0 mol% or less of Na2O; and 0.0 mol% or more and It may contain 0.5 mol% or less of K2O, where R2O is in the range of 15.0 mol% or more and 20.0 mol% or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 30.0 mol% or more and 38.0 mol% or less; and -0.1≦(Al2O3−(R2O+R2O)) / Li2O≦0.3 (R2O is the total alkaline earth metal oxides in the glass composition).

[0117] The 112th embodiment A112 includes the glass composition according to the 111th embodiment A111, in which R2O is in the range of 15.0 mol % or more and 17.0 mol % or less.

[0118] The 113th embodiment A113 includes the glass composition according to the 111th embodiment A111 or the 112th embodiment A112, in which Al2O3+R2O is in the range of 32.0 mol % or more and 36.0 mol % or less.

[0119] A one hundred fourteenth embodiment A114 comprises a glass composition according to any of the one hundred eleventh to thirteenth embodiments A111-A113, wherein 0.0≦(Al 2 O 3 −(R 2 O+RO)) / Li 2 O≦0.1.

[0120] A 115th embodiment A115 includes a glass composition according to any of the 111th to 114th embodiments A111-A114, wherein 0.9≦Al 2 O 3 / (R 2 O + RO)≦1.1.

[0121] A 116th embodiment A116 includes a glass composition according to any of the 111th to 115th embodiments A111-A115, wherein Al2O3 + R2O + B2O3 is 32.0 mol% or greater.

[0122] A 117th embodiment A117 includes a glass composition according to any of the 111th to 116th embodiments A111-A116, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0123] A 118th embodiment A118 includes a glass composition according to a 117th embodiment A117, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0124] A 119th embodiment A119 includes a glass composition according to a 118th embodiment A118, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0125] A 120th embodiment A120 comprises a glass composition according to any of the 111th to 119th embodiments A111-A119, further comprising up to 2.0 mol % MgO.

[0126] A 121st embodiment A121 comprises a glass composition according to any of the 111th to 120th embodiments A111-A120, further comprising 0.0 mol % to 1.0 mol % TiO2.

[0127] A 122nd embodiment A122 comprises a glass composition according to any one of the 111th to 121st embodiments A111-A121, further comprising 0.0 mol % to 1.0 mol % SnO2.

[0128] A 123rd embodiment A123 comprises a glass composition according to any of the 111th to 122nd embodiments A111-A122, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0129] A 124th embodiment A124 comprises a glass composition according to any of embodiments A111-A122, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0130] A 125th embodiment A125 comprises a glass composition according to any of the 111th to 122nd embodiments A111-A122, wherein Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0131] A 126th embodiment A126 includes a glass composition according to any one of the 111th to 125th embodiments A111-A125, in which the glass composition has a density in the range of 2.20 or more and 2.60 or less.

[0132] A 127th embodiment A127 includes a glass composition according to any one of embodiments A111 to A126, in which the glass composition has a liquidus viscosity in the range of 5.0 kP or more and 175.0 kP or less.

[0133] A 128th embodiment A128 includes a glass composition according to any one of the 111th to 127th embodiments A111-A127, in which the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0134] A 129th embodiment A129 includes the glass composition according to the 128th embodiment A128, in which the glass composition has a softening point in the range of 750.0°C or more and 925.0°C or less.

[0135] A 130th embodiment A130 includes a glass composition according to a 129th embodiment A129, in which the glass composition has a softening point in the range of 790.0°C or more and 910.0°C or less.

[0136] A 131st embodiment A131 includes a glass composition according to any of embodiments A111 to A127, wherein the glass composition has a softening point of 900.0° C. or less.

[0137] A 132nd embodiment A132 includes a glass composition according to the 131st embodiment A131, wherein the glass composition has a softening point of 875.0°C or less.

[0138] A 133rd embodiment A133 includes a glass composition according to a 132nd embodiment A132, wherein the glass composition has a softening point of 860.0° C. or less.

[0139] A 134th embodiment, A134, is characterized in that the glass composition has a modulus of elasticity of 0.70 MPa.m as measured by the chevron notched short bar method. 1 / 2 More than K 1C The glass-based article includes a glass composition according to any of aspects A111-A133, having fracture toughness.

[0140] A 135th embodiment, A135, is characterized in that the glass composition has a modulus of elasticity of 0.73 MPa.m as measured by the chevron notched short bar method. 1 / 2 More than K 1C The glass-based article according to embodiment A134 has fracture toughness.

[0141] A 136th embodiment A136 includes a glass-based article having a glass composition according to any of embodiments A111 to A133, wherein the glass composition is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0142] A 137th embodiment A137 includes a glass-based article according to a 136th embodiment A136, in which the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C or more and 500.0°C or less for a period of 2 hours or more and 12 hours or less.

[0143] A thirty-eighth embodiment A138 includes a glass-based article according to the thirty-seventh embodiment A137, wherein the ion exchange bath further comprises NaNO 3 .

[0144] A 139th embodiment, A139, includes a glass-based article according to any of A136-A138, A136-A138, wherein the tempered glass-based article has a compressive stress of 600.0 MPa or greater.

[0145] A forty-first embodiment, A140, includes a glass-based article according to any of the thirty-sixth to thirty-ninth embodiments, A136-A139, wherein the glass-based article being strengthened has a maximum central tension of 20.0 MPa or greater.

[0146] A one hundred forty-first embodiment A141 includes a glass-based article according to the one hundred forty-first embodiment A140, wherein the glass-based article being strengthened has a maximum central tension of 60.0 MPa or greater.

[0147] A one hundred forty-second embodiment A142 includes a glass-based article according to any of embodiments A136-A141, wherein the glass-based article being strengthened has a compression depth of 0.15t or greater, where t is the thickness of the glass-based article being strengthened.

[0148] A one hundred forty-third embodiment A143 includes a glass-based article according to the one hundred forty-second embodiment A142, wherein the glass-based article being strengthened has a compression depth of 0.18t or greater.

[0149] A one hundred forty-fourth embodiment A144 includes the glass-based article according to any of the one hundred thirty-sixth to one hundred forty-third embodiments A136-A143, wherein the glass-based article being strengthened has a depth of layer of 5.0 μm or greater.

[0150] A one hundred forty-fifth embodiment A145 includes the glass-based article according to the one hundred forty-fourth embodiment A144, wherein the glass-based article being strengthened has a depth of layer of 10.0 μm or greater.

[0151] A 146th embodiment A146 includes a glass-based article according to any of embodiments A136-A138, wherein the glass being tempered has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater (where t is the thickness of the glass-based article being tempered), and a depth of layer of 5.0 μm or greater.

[0152] A one hundred forty-seventh embodiment A147 includes a glass-based article according to the one hundred forty-sixth embodiment A146, wherein the glass being tempered has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0153] A 148th embodiment A148 includes a glass-based article according to any one of embodiments A136-A147, wherein the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0154] A one hundred forty-ninth embodiment A149 includes the glass-based article according to any of embodiments A136-A147, wherein the glass-based article being strengthened has a Knoop scratch threshold of 9.0 N or greater.

[0155] A fifty-first embodiment, A150, includes the glass-based article according to any of the thirty-sixth to fourteenth embodiments, A136-A149, wherein the glass-based article being strengthened has a breakage height of 100.0 cm or greater, measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.5 mm.

[0156] A one hundred fifty-first embodiment A151 includes a glass-based article according to the one hundred fifty-first embodiment A150, wherein the glass-based article being strengthened has a breakage height of 120.0 cm or greater.

[0157] A fifty-second embodiment A152 includes the glass-based article according to the fifty-first embodiment A151, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater.

[0158] A fifty-third embodiment, A153, includes a glass-based article according to any of embodiments A136-A149, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater, measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0159] A fifty-fourth embodiment A154 includes the glass-based article according to the fifty-third embodiment A153, wherein the glass-based article that is strengthened has a breakage height of 180.0 cm or greater.

[0160] A fifty-fifth embodiment A155 includes the glass-based article according to the fifty-fourth embodiment A154, wherein the glass-based article that is strengthened has a breakage height of 200.0 cm or greater.

[0161] A fifty-sixth embodiment, A156, includes a glass-based article according to any of embodiments A136 to A155, wherein the glass-based article being strengthened has a residual strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0162] A fifty-seventh embodiment A157 includes the glass-based article according to the fifty-seventh embodiment A156, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0163] A fifty-eighth embodiment, A158, includes a glass composition according to the fifty-seventh embodiment, A157, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0164] A 159th embodiment, A159, includes the glass-based article according to any of embodiments 136 to 155, A136-A155, wherein the glass-based article being strengthened has a residual strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0165] A sixty-first embodiment A160 includes a glass-based article according to a fifty-ninth embodiment A159, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0166] A sixty-first embodiment A161 includes a glass-based article according to the sixty-first embodiment A160, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0167] A one hundred sixty-second embodiment, A162, includes a glass-based article according to any of embodiments A136-A155, wherein the glass-based article being strengthened has a residual strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0168] A sixty-third embodiment A163 includes a glass-based article according to the sixty-second embodiment A162, wherein the tempered glass-based article has a residual strength of 220.0 MPa or greater.

[0169] A sixty-fourth embodiment, A164, includes the glass-based article according to the sixty-third embodiment, A163, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0170] A 165th embodiment A165 includes a consumer electronic device comprising: a housing having a front, a back, and sides; an electrical component disposed at least partially within the housing, the electrical component comprising at least a controller, a memory, and a display, the display being disposed on or adjacent to the front of the housing; and wherein the glass composition or glass-based article of any of embodiments A111 to A164 is disposed over the display, forms part of the housing, or is disposed over the display and forms part of the housing.

[0171] According to a sixty-sixth aspect A166, the glass composition may include: 55.0 to 65.0 mol% SiO2; 14.0 to 20.0 mol% Al2O3; 0.0 to 3.0 mol% P2O3; and 1.0 to 7.0 mol% B2O3, where -0.1≦(Al2O3−(R2O+R2O)) / Li2O≦0.3, where R2O is the total alkali metal oxides in the glass composition and R2O is the total alkaline earth metal oxides in the composition, and the glass composition has a softening point of 900.0° C. or less.

[0172] A sixty-seventh embodiment, A167, includes a glass composition according to the sixty-sixth embodiment, A166, wherein the glass composition has a softening point of 875.0° C. or less.

[0173] A 168th embodiment A168 includes a glass composition according to A166 or A167, wherein the glass composition has a softening point of 860.0° C. or less.

[0174] A sixty-ninth embodiment, A169, includes a glass-based article having a glass composition according to any one of embodiments A166-A168, wherein the glass composition is chemically strengthened.

[0175] A 170th embodiment A170 includes a glass-based article according to a 169th embodiment A169, in which the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C or more and 500.0°C or less for a period of 2 hours or more and 12 hours or less.

[0176] A seventy-first embodiment A171 includes a glass-based article according to the seventy-first embodiment A170, wherein the ion exchange bath further comprises NaNO 3 .

[0177] A 172nd embodiment A172 includes a glass-based article according to any of embodiments A169 to A171, wherein the glass-based article being strengthened has a breakage height of 100.0 cm or greater, measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.5 mm.

[0178] A seventy-third embodiment A173 includes the glass-based article according to the seventy-second embodiment A172, wherein the glass-based article being strengthened has a breakage height of 120.0 cm or greater.

[0179] A seventy-fourth embodiment A174 includes the glass-based article according to the seventy-third embodiment A173, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater.

[0180] A 175th embodiment, A175, includes a glass-based article according to any of embodiments 169 to 171, A169-A171, wherein the glass-based article being strengthened has a breakage height of 150.0 cm or greater, measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0181] A seventy-sixth embodiment A176 includes the glass-based article according to the seventy-fifth embodiment A175, wherein the glass-based article that is strengthened has a breakage height of 180.0 cm or greater.

[0182] A seventeenth embodiment, A177, includes the glass-based article according to the seventeenth embodiment, A176, wherein the glass-based article being strengthened has a breakage height of 200.0 cm or greater.

[0183] A seventy-eighth embodiment, A178, includes a glass-based article according to any of the sixty-ninth through seventy-seventh embodiments, A169-A177, wherein the glass-based article being strengthened has a compressive stress of 450.0 MPa or greater.

[0184] A seventy-ninth embodiment, A179, includes a glass-based article according to any of the sixty-ninth through seventy-eighth embodiments, A169-A178, wherein the glass-based article being strengthened has a maximum central tension of 60.0 MPa or greater.

[0185] A one hundred eighty embodiment, A180, includes a glass-based article according to any of embodiments A169-A179, wherein the glass-based article being strengthened has a compression depth of 0.15t or greater, where t is the thickness of the glass-based article being strengthened.

[0186] A one hundred eighty-first embodiment, A181, includes a glass-based article according to any of the one hundred sixty-ninth to one hundred eighty-ninth embodiments, A169-A180, wherein the glass-based article being strengthened has a depth of layer of 5.0 μm or greater.

[0187] A one hundred eighty-second embodiment A182 includes a glass-based article according to any of embodiments A169-A181 of the one hundred sixty-nine through eighty-first embodiments, wherein the glass-based article being strengthened has a Knoop scratch threshold of 6.0 N or greater.

[0188] A one hundred eighty-third embodiment, A183, includes a glass-based article according to any of embodiments A169 to A182, wherein the glass-based article being strengthened has a residual strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0189] A one hundred eighty-fourth embodiment, A184, includes the glass-based article according to the one hundred eighty-third embodiment, A183, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0190] A one hundred eighty-fifth embodiment, A185, includes a glass composition according to the one hundred eighty-fourth embodiment, A184, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0191] A one hundred eighty-sixth embodiment, A186, includes a glass-based article according to any of embodiments A169 to A182, wherein the glass-based article being strengthened has a residual strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0192] A one hundred eighty-seventh embodiment, A187, includes the glass-based article according to the one hundred eighty-sixth embodiment, A186, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0193] A one hundred eighty-eighth embodiment, A188, includes the glass-based article according to the one hundred eighty-seventh embodiment, A187, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0194] A 189th embodiment, A189, includes a glass-based article according to any of embodiments 169 to 182, A169-A182, wherein the glass-based article being strengthened has a residual strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0195] A nineteenth embodiment A190 includes a glass-based article according to a one hundred eighty-ninth embodiment A189, wherein the tempered glass-based article has a residual strength of 220.0 MPa or greater.

[0196] A ninety-first embodiment A191 includes a glass-based article according to the ninety-first embodiment A190, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0197] According to a one hundred ninety-second embodiment A192, a glass-based article that is chemically strengthened may comprise: 55.0 mol% or greater and 65.0 mol% or less of SiO2; 14.0 mol% or greater and 20.0 mol% or less of Al2O3; 0.0 mol% or greater and 3.0 mol% or less of P2O3; and 1.0 mol% or greater and 7.0 mol% or less of B2O3, where -0.1≦(Al2O3−(R2O+R2O)) / Li2O≦0.3, where R2O is the total alkali metal oxides in the glass-based article and R2O is the total alkaline earth metal oxides in the glass-based article, and the strengthened glass-based article has a break height of 100.0 cm or greater, measured according to a drop test method on 180 grit sandpaper for an article having a thickness of less than 0.5 mm.

[0198] A ninety-third embodiment A193 includes a tempered glass-based article according to the ninety-second embodiment A192, wherein the tempered glass-based article has a breakage height of 120.0 cm or greater.

[0199] A ninety-fourth embodiment A194 includes a tempered glass-based article according to the ninety-third embodiment A193, wherein the tempered glass-based article has a breakage height of 150.0 cm or greater.

[0200] A one hundred ninety-fifth embodiment, A195, includes a tempered glass-based article according to any of embodiments A192-A194, wherein the tempered glass-based article has a compressive stress of 450.0 MPa or greater.

[0201] A one hundred ninety-sixth embodiment, A196, includes a tempered glass-based article according to any of the one hundred ninety-second through one hundred ninety-fifth embodiments, A192-A195, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0202] A one hundred ninety-seventh embodiment, A197, includes a tempered glass-based article according to any of embodiments A192-A196, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass article.

[0203] A one hundred ninety-eighth embodiment, A198, includes a tempered glass-based article according to any of embodiments A192-A197, wherein the tempered glass-based article has a depth of layer of 5.0 μm or greater.

[0204] A one hundred ninety-ninth embodiment, A199, includes a tempered glass-based article according to any of embodiments A192-A198, wherein the tempered glass-based article has a Knoop scratch threshold of 6.0 N or greater.

[0205] According to a two hundredth aspect, A200, a chemically strengthened glass-based article may comprise: 55.0 mol% or greater and 65.0 mol% or less of SiO2; 14.0 mol% or greater and 20.0 mol% or less of Al2O3; 0.0 mol% or greater and 3.0 mol% or less of P2O3; and 1.0 mol% or greater and 7.0 mol% or less of B2O3, where -0.1≦(Al2O3−(RO+RO)) / Li2O≦0.3, where RO is the total alkali metal oxides in the glass-based article and RO is the total alkali metal oxides in the glass-based article, and the chemically strengthened glass-based article has a break height of 150.0 cm or greater, as measured according to a drop test method on 180 grit sandpaper for an article having a thickness of less than 0.6 mm.

[0206] A two hundred first embodiment, A201, includes the strengthened glass-based article according to the two hundredth embodiment, A200, wherein the chemically strengthened glass-based article has a breakage height of 180.0 cm or greater.

[0207] A two hundred second embodiment, A202, includes the strengthened glass-based article according to the two hundred first embodiment, A201, wherein the chemically strengthened glass-based article has a breakage height of 200.0 cm or greater.

[0208] A third embodiment A203 includes a tempered glass-based article according to any of embodiments A200-A202, wherein the tempered glass-based article has a compressive stress of 450.0 MPa or greater.

[0209] A two hundred fourth embodiment, A204, includes a tempered glass-based article according to any of the two hundred through two hundred third embodiments, A200-A203, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0210] A two hundred fifth embodiment, A205, includes a tempered glass-based article according to any of embodiments A200-A204, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass article.

[0211] A two hundred sixth embodiment, A206, includes a tempered glass-based article according to any of the two hundred through five embodiments, A200-A205, wherein the tempered glass-based article has a depth of layer of 5.0 μm or greater.

[0212] A two hundred seventh embodiment, A207, includes a tempered glass-based article according to any of the two hundred through sixth embodiments, A200-A206, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0213] According to a two hundred eighth embodiment, A208, a glass-based article comprises: a composition comprising a lithium-based aluminosilicate; first and second opposing surfaces defining a thickness (t) of the glass-based article, the thickness of the glass-based article being greater than or equal to 100 μm and less than or equal to 1000 μm; a breakage height, as measured by drop test on 180 grit sandpaper, of greater than or equal to 100 cm; and a Knoop scratch threshold greater than or equal to 6.0 N and less than or equal to 12.0 N.

[0214] A two hundred ninth embodiment, A209, includes a glass-based article according to the two hundred eighth embodiment, A208, wherein the thickness of the glass-based article is greater than or equal to 400 μm and less than or equal to 800 μm.

[0215] A two hundred and tenth embodiment, A210, includes a glass-based article according to any of the two hundred and nine embodiments, A208-A209, wherein the thickness of the glass-based article is greater than or equal to 400 μm and less than or equal to 700 μm.

[0216] A two hundred and tenth embodiment, A211, includes the glass-based article according to any of the two hundred and eighth to tenth embodiments, A208-A210, having a breakage height of 150 cm or greater as measured by drop test method on 180 grit sandpaper.

[0217] A 212th embodiment, A212, includes a glass-based article according to any of 208 to 211th embodiments, A208-A211, having a breakage height of 200 cm or greater as measured by drop test method on 180 grit sandpaper.

[0218] A two hundred and thirteenth embodiment, A213, includes the glass-based article according to any of the two hundred and twelfth embodiments, A208-A212, wherein the glass-based article has a Knoop scratch threshold of 6.0 N or greater and 12.0 N or less.

[0219] A two hundred and fourteenth embodiment, A214, includes the glass-based article according to any of the two hundred and thirteenth embodiments, A208-A213, wherein the glass-based article has a Knoop scratch threshold of 7.0 N or greater and 12.0 N or less.

[0220] A two hundred fifteenth embodiment, A215, includes the glass-based article according to any of the two hundred eighth through fourteenth embodiments, A208-A214, wherein the glass-based article has a softening point of 650°C or more and 950°C or less.

[0221] A two hundred and sixteenth embodiment, A216, includes the glass-based article according to any of the two hundred and fifteenth embodiments, A208-A215, wherein the glass-based article has a softening point of 650°C or more and 800°C or less.

[0222] The 217th aspect A217 is a glass-based article having a K of 0.70 or more as measured by the chevron notched short bar method. 1C The glass-based article according to any of aspects A208-A216 has fracture toughness.

[0223] A two hundred eighteenth embodiment, A218, includes a glass-based article according to any of embodiments A208 through A217, wherein the glass-based article has a composition comprising: 50.0 mol% to 70.0 mol% SiO2; 10.0 mol% to 25.0 mol% Al2O3; 0.0 mol% to 5.0 mol% P2O3; 0.0 mol% to 10.0 mol% B2O3; 5.0 mol% to 15.0 mol% Li2O; 1.0 mol% to 15.0 mol% Na2O; and 0.0 mol% to 1.0 mol% KO.

[0224] A two hundred nineteenth embodiment, A219, includes a glass-based article according to a two hundred eighteenth embodiment, A218, having R2O equal to or greater than 11.0 mol% and equal to or less than 23.0 mol% (R2O is the sum in mol% of the alkali metal oxides present in the glass-based article); Al2O3 + R2O equal to or greater than 26.0 mol% and equal to or less than 40.0 mol%; and -0.1≦(Al2O3−(R2O+R2O)) / Li2O≦0.3 (R2O is the sum in mol% of the alkali metal oxides present in the glass-based article).

[0225] A two hundred twenty embodiment, A220, includes a glass-based article according to a two hundred twenty embodiment, A219, having R2O equal to or greater than 15.0 mol% and equal to or less than 19.0 mol%.

[0226] A two hundred twenty-first embodiment, A221, includes a glass-based article according to any of the two hundred nineteenth to two hundred twenty-first embodiments, A219-A220, wherein Al2O3 + R2O is greater than or equal to 28.0 mol% and less than or equal to 36.0 mol%.

[0227] A two-hundred-second embodiment, A222, includes a glass-based article according to any of the two-hundred-nine through two-hundred-first embodiments, A219-A221, wherein 0.0≦(Al2O3−(R2O+RO)) / Li2O≦0.1.

[0228] A two hundred twenty-third embodiment, A223, includes a glass-based article according to any of embodiments A219-A222 of the two hundred nineteenth through two hundred twenty-second embodiments, wherein the glass-based article is strengthened and has a compression depth of 0.15t or greater.

[0229] A two hundred twenty-fourth embodiment, A224, includes the glass-based article according to the two hundred twenty-third embodiment, A223, wherein the glass-based article being strengthened has a compressive stress of 600 MPa or greater.

[0230] A two hundred twenty-fifth embodiment, A225, includes a glass-based article according to any of embodiments A223-A224, wherein the glass-based article being strengthened has a maximum central tension of 20.0 MPa or greater.

[0231] A two hundred twenty-sixth embodiment, A226, includes a glass-based article according to any of the two hundred twenty-third through two hundred twenty-fifth embodiments, A223-A225, wherein the glass-based article being strengthened has a depth of layer of 5.0 μm or greater.

[0232] According to a two hundred twenty-seventh aspect, A227, a glass-based article may include a composition comprising a lithium-based aluminosilicate; first and second opposing surfaces defining a thickness (t) of the glass-based article, the opposing surfaces being greater than or equal to 100 μm and less than or equal to 1000 μm; a residual strength of greater than or equal to 150 MPa, measured on a glass-based article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N; and a Knoop scratch threshold of greater than or equal to 6.0 N and less than or equal to 12.0 N.

[0233] A two hundred twenty-eighth embodiment, A228, includes the glass-based article according to the two hundred twenty-seventh embodiment, A227, wherein the glass-based article has a residual strength of 175 MPa or greater, measured on a glass-based article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0234] A two hundred twenty-ninth embodiment, A229, includes the glass-based article according to any of embodiments A227-A228 of the two hundred twenty-ninth embodiments, wherein the glass-based article has a residual strength of 175 MPa or greater, measured on a glass-based article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0235] According to aspect A230, a consumer electronic device includes a housing having a front, a back, and sides; electrical components disposed at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display being disposed on or adjacent to the front of the housing, and wherein the glass-based article of any one of aspects 208 to 229 is disposed over the display, forms at least a portion of the housing, or is formed over the display and forms at least a portion of the housing.

[0236] According to a 231st embodiment A231, the glass-based article of any one of the 208 to 229 embodiments is a cover glass for a mobile phone.

[0237] Additional features and advantages of what is described herein are set forth in the detailed description that follows, and in part will become readily apparent to those skilled in the art from that description, or may be learned by practicing the embodiments described herein, including the following detailed description, claims, and accompanying drawings.

[0238] It should be understood that both the foregoing general description and the following detailed description describe various embodiments and are intended to provide an overview or framework for understanding the nature and character of the claimed subject matter. The accompanying drawings are included to provide a further understanding of the various embodiments, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments described herein and, together with the description, serve to explain the principles and operation of the claimed subject matter. [Brief explanation of the drawings]

[0239] [Figure 1] FIG. 1 is a plan view of an exemplary device dropper that can be used to perform the drop test method. [Figure 2] A top view of the machine in Figure 1, with the device dropper chuck released, the chuck jaws open, and the puck released. [Figure 3] Plan view of the machine in Figure 1 with the falling puck hitting the drop surface. [Figure 4] Schematic diagram of an apparatus for introducing damage into glass products via impact with a striking object. [Figure 5] 1 is a schematic diagram of a cross section of glass having a compressive stress layer on its surface according to an embodiment disclosed and described herein; [Figure 6A] FIG. 1 is a plan view of an exemplary electronic device incorporating any of the glass articles disclosed herein. [Figure 6B]FIG. 6B is a perspective view of the exemplary electronic device of FIG. [Figure 7] Plot of breakage heights of glass compositions of the examples and comparative examples [Figure 8] Another plot of the breakage height of the example glass composition and the comparative example glass composition. [Figure 9] Plot of residual strength of example glass compositions and comparative glass compositions DETAILED DESCRIPTION OF THE INVENTION

[0240] Reference will now be made in detail to various embodiments of ion-exchangeable alkali aluminosilicate glass compositions exhibiting improved mechanical durability. According to embodiments, the glass compositions include 50.0 mol% to 70.0 mol% SiO2; 10.0 mol% to 25.0 mol% Al2O3; 0.0 mol% to 5.0 mol% P2O3; 0.0 mol% to 10.0 mol% B2O3; 5.0 mol% to 15.0 mol% Li2O; 1.0 mol% to 15.0 mol% Na2O; and 0.0 mol% to 1.0 mol% K2O. The sum of R2O of all alkali oxides present in the glass composition can range from 11.0 mol% to 23.0 mol%. The sum of Al2O3 and R2O present in the glass composition can range from 26.0 mol% to 40 mol%. The glass composition may satisfy the relationship: -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3. Various embodiments of the glass composition are referenced herein with particular reference to the accompanying drawings.

[0241] Ranges can be expressed herein as from about one particular value, and / or to about another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values ​​are expressed as approximations, for example, by use of the antecedent "about," it will be understood that the particular value forms another embodiment. Moreover, it will be understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.

[0242] Directional terms used herein (e.g., up, down, right, left, front, back, upper, bottom) are made with reference to the depicted figures only and are not intended to imply absolute directions.

[0243] Unless otherwise expressly stated, it is in no way intended that any method described herein be construed as requiring that its steps be performed in a particular order or that an apparatus require a particular orientation. Thus, where a method claim does not actually recite the order its steps are to follow, or an apparatus claim does not actually recite an order or orientation for individual components, or where the claims or specification otherwise expressly state that the steps are to be limited to a particular order, or where no particular order or orientation for the apparatus components is recited, no order or direction is intended to be inferred in any sense. This applies regardless of any implicit basis for interpretation, such as: logical considerations regarding the arrangement of steps, operational flow, component order, or component direction; plain meaning derived from grammatical organization or punctuation; and the number or type of embodiments described in the specification.

[0244] As used herein, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a" element includes aspects having two or more such elements unless the context clearly dictates otherwise.

[0245] The "base composition" refers to the chemical makeup of the substrate prior to ion exchange (IOX) processing. That is, the base composition is not doped with ions from the IOX. If the IOX processing conditions are such that the ions supplied to the IOX do not diffuse to the center of the substrate, the composition of the center of the IOX-processed glass-based article is typically the same as the base composition. In one or more embodiments, the center composition at the center of the glass article comprises the base composition. The "center" of a glass article may be measured at a thickness of 0.5t and at a distance of at least 0.5t from any edge of the glass article.

[0246] The term "lithium-based" means that lithium constitutes a significant portion of the alkali metal oxides present in the glass composition. Without limitation, "lithium-based" includes glass compositions having at least 5.0 mol % LiO in the glass composition.

[0247] The term "glass-based article" includes glass or glass-ceramic articles formed from the glass compositions disclosed and described herein.

[0248] The term "substantially free," when used to describe the concentration and / or absence of a particular component in a glass composition, means that the component is not intentionally added to the glass composition. However, the glass composition may contain trace amounts of the component as contaminants or tramps in amounts less than 0.05 mol %. Terms such as "0 mol %," "free," and the like, when used to describe the concentration and / or absence of a particular component in a glass-based article, mean that the component is not intentionally added to the glass-based article.

[0249] In the glass composition embodiments described herein, unless otherwise specified, concentrations of components (e.g., SiO2, Al2O3, etc.) are specified in mole percent (mol%) on an oxide basis.

[0250] As used herein, the term "softening point" refers to the point at which the viscosity of a glass composition reaches 1×10 7.6The softening point is the temperature at which the viscosity reaches poise. The softening point was determined using the parallel plate viscosity method of ASTM C1351M-96(2012).

[0251] As used herein, the term "annealing point" refers to the point at which the viscosity of a glass composition reaches 1×10 13 Poise refers to the temperature at which the viscosity becomes poise.

[0252] As used herein, the term "strain point" refers to the point at which the viscosity of a glass composition decreases to 1×10 14.68 This refers to the temperature at which the volume becomes poise.

[0253] As used herein, unless otherwise specified, the term "CTE" refers to the coefficient of thermal expansion of a glass composition over a temperature range from about 20°C to about 300°C.

[0254] As used herein, the term "liquidus viscosity" refers to the viscosity of the glass at the onset of devitrification (i.e., at the liquidus temperature as determined by the gradient furnace method according to ASTM C829-81).

[0255] The elastic modulus of the glasses (also called Young's modulus) is provided in gigapascals (GPa) and is determined by resonant ultrasonic spectroscopy of bulk samples of each glass composition.

[0256] Density is measured by the buoyancy method of ASTM C693-93(2013).

[0257] Glass compositions according to embodiments have high fracture toughness. Without being bound by any particular theory, high fracture toughness can provide glass compositions with improved drop performance. Fracture toughness is determined by the K 1C It is called the K value and is measured by the chevron notched short bar method. 1CThe chevron-notched short bar (CNSB) method used to measure the value is disclosed in Reddy, KPR et al., “Fracture Toughness Measurement of Glass and Ceramic Materials Using Chevron-Notched Specimens,” J. Am. Ceram. Soc., 71 [6], C-310-C-313 (1988), except that Y*m is calculated using Equation 5 in Bubsey, RT et al., “Closed-Form Expressions for Crack-Mouth Displacement and Stress Intensity Factors for Chevron-Notched Short Bar and Short Rod Specimens Based on Experimental Compliance Measurements,” NASA Technical Memorandum 83796, pp. 1-30 (October 1992). The fracture toughness was measured by adding K 1C Measurements are made on untempered glass articles, such as measuring values, thereby characterizing the glass substrate before IOX treatment. The fracture toughness test method described herein is not suitable for glass exposed to IOX treatment. Nevertheless, measurements on a corresponding underlying glass substrate (without IOX treatment) provide valuable information about the IOX-treated glass properties. Thus, the fracture toughness of an IOXed article is measured on an otherwise identical article that is not IOXed. Unless otherwise specified, the CSNB method is used to measure the fracture toughness values ​​described herein.

[0258] As used herein, the term "single ion exchange process" refers to a process in which a glass composition is exposed to a single ion exchange solution, such as a KNO or NaNO molten salt bath.

[0259] As used herein, the term "double ion exchange process" refers to a process in which a glass composition is exposed to a first ion exchange solution and a second ion exchange solution.

[0260] As used herein, the term "multiple ion exchange process" refers to a process in which a glass composition is exposed to three or more ion exchange solutions.

[0261] As used herein, the term "depth of compression" (DOC) refers to the depth at which the stress transitions from positive (compressive) stress to negative (tensile) stress, thus exhibiting a stress value of zero.

[0262] As used herein, the term "depth of layer" (DOL) refers to the depth within a glass-based article to which metal oxide or alkali metal oxide ions (e.g., metal ions or alkali metal ions) diffuse within the glass-based article (i.e., the distance from the surface of the glass-based article to its interior region) where the concentration of the ions reaches a minimum as determined by glow discharge-optical emission spectroscopy (GD-OES). Unless otherwise specified, the DOL is given as the depth of exchange of the slowest-diffusing ion introduced by the ion exchange (IOX) process.

[0263] A non-zero metal oxide concentration that varies from the first surface to the depth of layer (DOL) for a metal oxide, or that varies along at least a significant portion of the thickness (t) of the article, is indicative of stress being generated in the article as a result of ion exchange. The variation in metal oxide concentration may be referred to herein as a metal oxide concentration gradient. A non-zero concentration of a metal oxide that varies from the first surface to the DOL or along a portion of the thickness may be described as generating stress in the glass-based article. The metal oxide concentration gradient or variation is produced by chemically strengthening a glass-based substrate, where a plurality of first metal ions in the glass-based substrate are exchanged for a plurality of second metal ions.

[0264] According to common practice in the art, compression or compressive stress is expressed as a negative (<0) stress, and tension or tensile stress is expressed as a positive (>0) stress. However, throughout this specification, Cs will be expressed as a positive or absolute value—i.e., as described herein, Cs = |Cs|. Compressive stress (Cs) is at or near a maximum value at the surface of the glass, and Cs varies with distance d from the surface according to the function

[0265] Compressive stress (CS) and depth of layer (DOL) are measured by a surface stress meter (FSM) using commercially available equipment such as the FSM-6000 manufactured by Orihara Seisakusho, Japan. Surface stress measurements rely on accurate measurement of the stress-optical coefficient (SOC), which is related to the birefringence of the glass. SOC is measured in accordance with Procedure C (glass disk method) described in ASTM standard C770-16, entitled "Standard Test Method for Measurement of Glass Stress-Optical Coefficient," the entire contents of which are incorporated herein by reference.

[0266] The maximum central tension (CT) or peak tension (PT) values ​​and stress retention values ​​are measured using the scattered light polarizer (SCALP) technique, which is known in the art. The refractive near-field (RNF) method or SCALP can be used to measure the stress profile and depth of compression (DOC). When the RNF method is used to measure the stress profile, the maximum CT value provided by SCALP is utilized in the RNF method. In particular, the stress profile measured by RNF is force balanced and calibrated to the maximum CT value provided by the SCALP measurement. The RNF method is described in U.S. Pat. No. 8,854,623, entitled "Systems and methods for measuring a profile characteristic of a glass sample," which is incorporated herein by reference in its entirety. In particular, the RNF method includes placing a glass article adjacent to a reference block, generating a polarization-switched light beam that is switched between orthogonal polarizations at a rate of 1 Hz to 50 Hz, measuring the amount of power in the polarization-switched light beam, and generating a polarization-switched reference signal, where the amount of power measured at each of the orthogonal polarizations is within 50% of each other. The method further includes transmitting the polarization-switched light beam through the glass sample and the reference block at various depths into the glass sample, and then relaying the transmitted polarization-switched light beam using relay optics to a signal photodetector that generates a polarization-switched detector signal. The method also includes dividing the detector signal by the reference signal to form a normalized detector signal and determining a profile characteristic of the glass sample from the normalized detector signal.

[0267] As used herein, the term "Knoop scratch threshold" refers to the initiation of a lateral crack (in three or more of the five scratch events). To determine the Knoop scratch threshold, a series of increasing constant load scratches (a minimum of three per load, but more per load can be used to increase the confidence level) are performed. In the Knoop scratch threshold test, for each load, the glass substrate and / or article sample is scratched with a Knoop indenter over a length of 10 mm. The following three failure modes are used to determine the Knoop scratch threshold: 1) a persistent side crack greater than twice the width of the groove; 2) the presence of a side crack less than twice the width of the groove, but containing damage within the groove, and visible damage; or 3) the presence of a large subsurface lateral crack greater than twice the width of the groove, and / or a median crack at the apex of the scratch. Thus, the Knoop scratch threshold is the maximum load at which none of the above three failures occur in three or more of the five events.

[0268] As used herein, the term "failure height" refers to the minimum height to which a device containing a glass article can be dropped, causing the glass article to break (i.e., crack). A drop test method is used to determine the failure height of a device. The drop test method involves performing a surface drop test on a pack to which the glass article is attached. The glass article is attached to the pack using tesa® 61385 double-sided adhesive tape, which holds the glass article to the pack during the drop test described below. The glass article being tested has a thickness similar to or equal to that used in a given portable consumer electronic device, such as 0.5 mm or 0.6 mm. A puck refers to a structure intended to mimic the size, shape, and weight distribution of a given device, such as a mobile phone. Hereinafter, the term "puck" refers to a structure weighing 126.0 grams, 133.1 mm long, 68.2 mm wide, and 9.4 mm high. In an embodiment, the puck has dimensions and weight similar to those of a portable electronic device.

[0269] An exemplary device drop machine that can be used to perform the drop test method is shown in FIG. 1 as reference numeral 10. The device drop machine 10 includes a chuck 12 having chuck jaws 14. A puck 16 is loaded onto the chuck jaws 14 with a glass article attached and facing downward. The chuck 12 is ready to be dropped, for example, from an electromagnetic chuck lifter. Referring now to FIG. 2, the chuck 12 is released, and during its drop, the chuck jaws 14 are triggered to open, for example, by a proximity sensor. Once the chuck jaws 14 open, the puck 16 is released. Referring now to FIG. 3, the falling puck 16 impacts a drop surface 18. The drop surface 18 can be sandpaper, such as 180-grit sandpaper, positioned on a steel plate. If the glass article attached to the puck survives the drop (i.e., does not crack), the chuck 12 is set to a higher height and the test is repeated. As a result, the breakage height is the minimum height to which a pack containing the glass article can be dropped and the glass composition will break. A single glass article is tested at multiple heights, such as 22 cm, 30 cm, 40 cm, 50 cm, 60 cm, and 10 cm increments, until the glass article shows damage and breaks. Once the glass breaks, the sandpaper is replaced. Unless otherwise specified, 180-grit sandpaper is used herein.

[0270] As used herein, the term "residual strength" refers to the strength of a glass article after damage is introduced by an impact force when the glass article is bent and subjected to a tensile stress. Damage is introduced according to the method described in U.S. Patent Application Publication No. 2019 / 0072469 A1, which is incorporated herein by reference. For example, an apparatus for impact testing of glass articles is shown in FIG. 4 as reference numeral 1100. Apparatus 1100 includes a pendulum 1102 including a plumb ball 1104 attached to a pivot 1106. As used herein, a "plumb ball" on a pendulum is a weight suspended from and connected to the pivot by an arm. Thus, the plumb ball 1104 shown is connected to the pivot 1106 by an arm 1108. The plumb ball 1104 includes a base 1110 for receiving a glass article, with the glass article attached to the base. The apparatus 1100 further includes a striking object 1140 positioned such that a surface of the plumb ball 1104 contacts the striking object 1140 when the plumb ball 1104 is released from a position at an angle greater than zero from the equilibrium position. The striking object includes an abrasive sheet having an abrasive surface placed in contact with the exterior surface of the glass article. The abrasive sheet may include sandpaper that may have a grit size ranging from 30 grit to 1000 grit, or from 100 grit to 300 grit, such as 80 grit, 120 grit, 180 grit, and 1000 grit sandpaper. Unless otherwise specified, 180 grit sandpaper was used herein.

[0271] For purposes of this disclosure, the impactor was in the form of a 6 mm diameter disk of 80-grit, 120-grit, or 180-grit sandpaper attached to the apparatus. Glass articles having a thickness of approximately 600.0 μm were fixed to a plumb ball. A new sandpaper disk was used for each impact. Damage to the glass articles was achieved with an impact force of approximately 500.0 N by pulling the swing of the apparatus arm to an angle of approximately 90°. Approximately 10 specimens of each glass article were impacted.

[0272] At least 12 hours after damage introduction, the glass articles were fractured in four-point bending (4PB). The damaged glass articles were placed on support rods (support span) with the damaged area on the bottom (i.e., tensile side) and between the load rods (load span). For purposes of this disclosure, the load span was 18 mm and the support span was 36 mm. The radius of curvature of the load rod and support rods was 3.2 mm. A screw-driven testing machine (Instron®, Norwood, Massachusetts, USA) was used to apply a constant displacement rate of 5 mm / min until the glass broke. The 4PB test was conducted at a temperature of 22°C + 2°C and a relative humidity (RH) of 50% + 5%.

[0273] The applied breaking stress (or applied stress to failure) in four-point bending (4PB) was calculated from the following formula:

[0274]

number

[0275] In the formula, P is the maximum load until breakage, L (= 36 mm) is the distance between the support rods (support span), a (= 18 mm) is the distance between the load rods (load span), b is the width of the glass plate, h is the thickness of the glass plate, and ν is the Poisson's ratio of the glass composition. The term (1 / (1-ν)) in formula (1) 2 )) takes into account the hardening effect of the plate. In four-point bending, the stress is constant across the load span, and therefore the damage site is under uniaxial tensile stress loading in mode I. The stress rate for the four-point bending test on the specimens was estimated to be 15-17 MPa per second. The residual strength of the glass composition is the maximum applied fracture stress at which no fracture occurs.

[0276] Alkali aluminosilicate glasses have good ion exchange capacity. Chemical strengthening processes have been used to achieve the high strength and toughness properties of aluminosilicate glasses. Sodium aluminosilicate glasses are highly ion-exchangeable glasses with good glass formability and quality. The substitution of Al2O3 into the silicate glass network increases the interdiffusivity of monovalent cations during ion exchange. Chemical strengthening in a molten salt bath (e.g., KNO3 or NaNO3) can achieve glasses with high strength, high toughness, and high indentation crack resistance.

[0277] Therefore, alkali aluminosilicate glasses with good physical properties, chemical durability, and ion exchange capacity have attracted attention for use as cover glasses. In particular, lithium-containing aluminosilicate glasses with lower annealing and softening temperatures, lower CTE values, and fast ion exchange capacity can achieve larger CT, DOC, and CS through various ion exchange processes provided herein. However, adding lithium to alkali aluminosilicate glasses can lower the melting point, softening point, or liquidus viscosity of the glass.

[0278] Drawing processes for forming glass articles, such as glass sheets, are desirable because they can produce thin glass articles with few defects. It was previously thought that glass compositions needed to have a relatively high liquidus viscosity (e.g., a liquidus viscosity greater than 1000 kP, 1100 kP, or 1200 kP) to be formed by a drawing process, such as melt drawing or slot drawing. However, the development of drawing processes has made it possible to use glasses with lower liquidus viscosities in drawing processes. Thus, glasses used in drawing processes can contain more lithium than previously thought, and can contain more glass network formers, such as SiO , Al O , and BO , for example. Thus, provided herein is a balance of various glass components that allows glasses to realize the benefits of adding lithium and glass network formers to glass compositions without adversely affecting the glass composition.

[0279] In particular, the glass compositions provided herein may contain more LiO, AlO, BO, and MgO, and less P0 and K0, than conventional glass compositions. The glass compositions provided herein may also contain relatively small amounts of TiO. LiO, AlO, B0, and MgO may have a high electric field strength, which may increase bond strength and increase the fracture toughness of the glass composition. P0 and K0 may have the opposite effect. Such combinations of varying elements may result in a lower softening point. Furthermore, the combinations of varying elements in the glass compositions provided herein may result in improved fracture toughness and ion exchange properties (e.g., higher CS and higher DOC), which may lead to improved drop test performance.

[0280] In embodiments of the alkali aluminosilicate glass compositions disclosed herein, SiO2 is the largest component, and therefore, SiO2 is the primary component of the glass network formed from the glass composition. Pure SiO2 has a relatively low CTE and is alkali-free. However, pure SiO2 has a high melting point. Therefore, if the concentration of SiO2 in a glass composition is too high, the formability of the glass composition may be reduced, as a high concentration of SiO2 increases the difficulty of melting the glass, which in turn adversely affects the formability of the glass. In embodiments, the glass composition may contain 50.0 to 70.0 mol% SiO2. In embodiments, the glass composition may contain 55.0 to 65.0 mol% SiO2. In embodiments, the glass composition may contain 57.0 to 63.0 mol% SiO2. In an embodiment, the concentration of SiO in the glass composition is 50.0 to 70.0 mol%, 50.0 to 67.0 mol%, 50.0 to 65.0 mol%, 50.0 to 63.0 mol%, 50.0 to 60.0 mol%, 55.0 to 70.0 mol%, 55.0 to 67.0 mol%, 55.0 to 65.0 mol%, 55.0 to 64.0 mol%, 55.0 to 63.0 mol%, 55.0 to 62.0 mol%, 55.0 to 61.0 mol%, 55.0 to 60.0 mol%, 55.0 to 59.0 mol%, 56.0 to 70.0 mol%, 56.0 to 67.0 mol%, 56.0 to 65.0 mol%, mol%, 56.0 to 64.0 mol%, 56.0 to 63.0 mol%, 56.0 to 62.0 mol%, 56.0 to 61.0 mol%, 56.0 to 60.0 mol%, 56.0 to 59.0 mol%, 57.0 to 70.0 mol%, 57.0 to 67.0 mol%, 57.0 to 65.0 mol%, 57.0 to 64.0 mol%, 57.0 to 63.0 mol%, 57.0 to 62.0 mol%, 57.0 to 61.0 mol%, 57.0 to 60.0 mol%, or 57.0 to 59.0 mol%, or any and all subranges formed from any of these endpoints.

[0281] The glass compositions described herein may further include Al2O3. Similar to SiO2, Al2O3 can function as a glass network former. Al2O3 can increase the viscosity of a glass composition due to its tetrahedral coordination in a glass melt formed from the glass composition. Excessive Al2O3 content can reduce the formability of the glass composition. However, when the Al2O3 concentration is balanced with the SiO2 and alkali oxide concentrations in the composition, Al2O3 can lower the liquidus temperature of the glass melt. Lowering the liquidus temperature improves the liquidus viscosity and improves the compatibility of the glass composition with certain forming processes, such as melt-forming processes. In embodiments, the glass composition may include 10.0 to 25.0 mol% Al2O3. In embodiments, the glass composition may include 14.0 to 20.0 mol% Al2O3. In embodiments, the glass composition may include 15.0 to 19.0 mol% Al2O3. In embodiments, the concentration of Al2O3 in the glass composition is 10.0 to 25.0 mol%, 10.0 to 23.0 mol%, 10.0 to 20.0 mol%, 10.0 to 19.0 mol%, 10.0 to 18.0 mol%, 12.0 to 25.0 mol%, 12.0 to 23.0 mol%, 12.0 to 20.0 mol%, 12.0 to 19.0 mol%, 12.0 to 18.0 mol%, 13.0 to 25.0 mol%, 13.0 to 23.0 mol%, 13.0 to 20.0 mol%, 13.0 to 19.0 mol%, 13.0 to 18.0 mol%, 14.0 to 25.0 mol%, 14.0 to 23.0 mol%, 14.0 to 20 ... The mol% may be in the ranges of 0 to 19.0 mol%, 14.0 to 18.0 mol%, 15.0 to 25.0 mol%, 15.0 to 23.0 mol%, 15.0 to 20.0 mol%, 15.0 to 19.0 mol%, 15.0 to 18.0 mol%, 16.0 to 25.0 mol%, 16.0 to 23.0 mol%, 16.0 to 20.0 mol%, 16.0 to 19.0 mol%, 16.0 to 18.0 mol%, 17.0 to 25.0 mol%, 17.0 to 23.0 mol%, 17.0 to 20.0 mol%, 17.0 to 19.0 mol%, or 17.0 to 18.0 mol%, or any and all subranges formed from any of these endpoints.In embodiments, the concentration of Al2O3 in the glass composition can be 10.0 mol% or more, 11.0 mol% or more, 12.0 mol% or more, 13.0 mol% or more, 14.0 mol% or more, 15.0 mol% or more, 16.0 mol% or more, or 17.0 mol% or more.

[0282] The glass compositions described herein may further include P2O5. Similar to SiO2 and Al2O3, P2O5 may be added to glass compositions as a network former, but this can reduce the meltability and formability of the glass composition. Therefore, P2O5 may be added in an amount that does not excessively reduce these properties. The addition of P2O5 also increases the diffusivity of ions in the glass composition during ion exchange processes, thereby increasing the efficiency of these processes. In embodiments, the glass compositions may include 0.0 to 5.0 mol% P2O5. In embodiments, the glass compositions may include 0.3 to 3.0 mol% P2O5. In embodiments, the glass compositions may include 0.5 to 2.5 mol% P2O5. In the embodiment, the concentration of P2O5 in the glass composition is 0.0 to 5.0 mol%, 0.0 to 4.0 mol%, 0.0 to 3.0 mol%, 0.0 to 2.5 mol%, 0.0 to 2.3 mol%, 0.0 to 2.0 mol%, 0.0 to 1.7 mol%, 0.0 to 1.5 mol%, 0.3 to 5.0 mol%, 0.3 to 4.0 mol%, 0.3 to 3.0 mol%, 0.3 to 2.5 mol%, 0.3 to 2.3 mol%, 0.3 to 2.0 mol%, 0.3 to 1.7 mol%, 0.3 to 1.5 mol%, 0.5 to 5.0 mol%, 0.5 to 4.0 mol%, 0.5 to 3.0 mol%, 0.5 to 2.5 mol%, 0.5 to 2.3 mol%. , 0.5-2.0 mol%, 0.5-1.7 mol%, 0.5-1.5 mol%, 0.7-5.0 mol%, 0.7-4.0 mol%, 0.7-3.0 mol%, 0.7-2.5 mol%, 0.7-2.3 mol%, 0.7-2.0 mol%, 0.7-1.7 mol%, 0.7-1.5 mol%, 1.0-5.0 mol%, 1.0-4.0 mol%, 1.0-3.0 mol%, 1.0-2.5 mol%, 1.0-2.3 mol%, 1.0-2.0 mol%, 1.0-1.7 mol%, or 1.0-1.5 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the glass composition may include 4.0 mol% or less P2O5. In embodiments, the concentration of P2O5 in the glass composition can be 5.0 mol% or less, 4.5 mol% or less, 4.0 mol% or less, 3.5 mol% or less, 3.0 mol% or less, 2.5 mol% or less, 2.0 mol% or less, or 1.5 mol% or less.

[0283] The glass compositions described herein may further include B2O3. Similar to SiO2, Al2O3, and P2O5, B2O3 may be added to glass compositions as a network former, but this reduces the meltability and formability of the glass composition. Therefore, B2O3 may be added in an amount that does not excessively reduce these properties. However, it has been found that the addition of boron significantly reduces the diffusivity of alkali ions in the glass composition, which in turn adversely affects the ion exchange performance of the resulting glass. In particular, it has been found that the addition of boron significantly increases the time required to achieve a given CT and / or DOC compared to a glass composition that does not contain boron. In embodiments, the glass composition may include 0.0 to 10.0 mol% B2O3. In embodiments, the glass composition may include 1.0 to 7.0 mol% B2O3. In embodiments, the glass composition may include 2.0 to 6.0 mol% B2O3. In the embodiment, the concentration of B2O3 in the glass composition is 0.0 to 10.0 mol%, 0.0 to 9.0 mol%, 0.0 to 8.0 mol%, 0.0 to 7.5 mol%, 0.0 to 7.0 mol%, 0.0 to 6.5 mol%, 0.0 to 6.0 mol%, 0.0 to 5.5 mol%, 0.0 to 5.0 mol%, 0.0 to 4.5 mol%, 0.5 to 10.0 mol%. mol%, 0.5 to 9.0 mol%, 0.5 to 8.0 mol%, 0.5 to 7.5 mol%, 0.5 to 7.0 mol%, 0.5 to 6.5 mol%, 0.5 to 6.0 mol%, 0.5 to 5.5 mol%, 0.5 to 5.0 mol%, 0.5 to 4.5 mol%, 1.0 to 10.0 mol%, 1.0 to 9.0 mol%, 1.0 to 8.0 mol%, 1.0 to 7.5 mol %, 1.0 to 7.0 mol%, 1.0 to 6.5 mol%, 1.0 to 6.0 mol%, 1.0 to 5.5 mol%, 1.0 to 5.0 mol%, 1.0 to 4.5 mol%, 1.5 to 10.0 mol%, 1.5 to 9.0 mol%, 1.5 to 8.0 mol%, 1.5 to 7.5 mol%, 1.5 to 7.0 mol%, 1.5 to 6.5 mol%, 1.5 to 6.0 mol% , 1.5 to 5.5 mol%, 1.5 to 5.0 mol%, 1.5 to 4.5 mol%, 2.0 to 10 mol%, 2.0 to 9.0 mol%, 2.0 to 8.0 mol%, 2.0 to 7.5 mol%, 2.0 to 7.0 mol%, 2.0 to 6.5 mol%, 2.0 to 6.0 mol%, 2.0 to 5.5 mol%, 2.0 to 5.0 mol%, 2.0 to 4.5 mol%, 2.5 to 10.0 mol%, 2.5 to 9.0 mol%, 2.5 to 8.0 mol%, 2.5 to 7.5 mol%, 2.5 to 7.0 mol%, 2.5 to 6.5 mol%, 0.0 to 6.0 mol%, 0.0 to 5.5 mol%, 2.5 to 5.0 mol%, 2.5 to 4.5 mol%, 3.0 to 10.0 mol%, 3.0 to 9.0 mol%, 3.0 to 8.0 mol%, 3.0 to 7.5 mol%, 3.0 to 7.0 mol%, 3.0 to 6.5 mol%, 3.0 to 6.0 mol%, 3.0 to 5.5 mol%, 3.0 to 5.0 mol%, 3.0 to 4.5 mol%, 3.5 to 10.0 mol%, 3.5 to 9 0.0 mol%, 3.5 to 8.0 mol%, 3.5 to 7.5 mol%, 3.5 to 7.0 mol%, 3.5 to 6.5 mol%, 3.5 to 6.0 mol%, 3.5 to 5.5 mol%, 3.5 to 5.0 mol%, 3.5 to 4.5 mol%, 4.0 to 10.0 mol%, 4.0 to 9.0 mol%, 4.0 to 8.0 mol%, 4.0 to 7.5 mol%, 4.0 to 7.0 mol%, 4.0 to 6.5 mol%, 4.0 to 6.0 mol%, 4.0 to 5.5 mol%, or 4.0 to 5.0 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of B2O3 in the glass composition can be 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.0 mol% or more, 2.5 mol% or more, 3.0 mol% or more, 3.5 mol% or more, or 4.0 mol% or more.

[0284] In embodiments, the glass compositions described herein can include a relatively high SiO concentration for enhanced durability, and can include B2O3 and Al2O3 for enhanced scratch resistance and P2O5 for improved ion exchange properties. In embodiments, the glass compositions can satisfy the relationship (B2O3 + P2O5 + Al2O3) / (SiO2) ≥ 0.20, (B2O3 + P2O5 + Al2O3) / (SiO2) ≥ 0.30, or (B2O3 + P2O5 + Al2O3) / (SiO2) ≥ 0.40. Therefore, by balancing the amounts of B2O3, P2O5, and Al2O3 within the above ranges, diffusivity and fracture toughness can be balanced.

[0285] The glass compositions described herein may further include Li2O. The effect of Li2O on glass compositions is discussed above. In part, the addition of lithium to the glass allows for better control of the ion exchange process and further reduces the softening point of the glass. In embodiments, the glass compositions may include 5.0 to 15.0 mol% Li2O. In embodiments, the glass compositions may include 5.0 to 10.0 mol% Li2O. In embodiments, the glass compositions may include 6.0 to 9.0 mol% Li2O. In the embodiment, the concentration of LiO in the glass composition is 5.0 to 15.0 mol%, 5.0 to 10.0 mol%, 5.0 to 9.0 mol%, 5.0 to 8.5 mol%, 5.0 to 8.0 mol%, 6.0 to 15.0 mol%, 6.0 to 10.0 mol%, 6.0 to 9.0 mol%, 6.0 to 8.5 mol%, 6.0 to 8.0 mol%, 6.0 to 7.5 mol%, 6.0 to 7.0 mol%, 6.5 to 15.0 mol%, 6.5 to 10.0 mol%, %, 6.5-9.0 mol%, 6.5-8.5 mol%, 6.5-8.0 mol%, 7.0-15.0 mol%, 7.0-10.0 mol%, 7.0-9.0 mol%, 7.0-8.5 mol%, 7.0-8.0 mol%, 7.5-15.0 mol%, 7.5-10.0 mol%, 7.5-9.0 mol%, or 7.5-8.5 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of LiO in the glass composition can be 15.0 mol% or less, 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, or 8.0 mol% or less.

[0286] The glass compositions described herein may further include alkali metal oxides other than LiO, such as NaO. NaO aids in the ion exchange capacity of the glass composition and also increases the melting point, improving the formability of the glass composition. However, adding too much NaO to the glass composition may result in a too low CTE and a too high melting point. Thus, in embodiments, the concentration of LiO present in the glass composition is greater than the concentration of NaO present in the glass composition. In embodiments, the glass composition may include 1.0 to 15.0 mol% NaO. In embodiments, the glass composition may include 4.0 to 10.0 mol% NaO. In embodiments, the glass composition may include 5.0 to 9.0 mol% NaO. In the embodiments, the concentration of NaO in the glass composition is 1.0 to 15.0 mol%, 1.0 to 10.0 mol%, 3.0 to 15.0 mol%, 3.0 to 10.0 mol%, 4.0 to 15.0 mol%, 4.0 to 10.0 mol%, 4.0 to 9.5 mol%, 4.0 to 9.0 mol%, 4.5 to 15.0 mol%, 4.5 to 10.0 mol%, 4.5 to 9.5 mol%, 4.5 to 9.0 mol%, 5.0 to 15 mol%, 5.0 to 10.0 mol%, 5.0 to 9.5 mol%, 5.0 to 9.0 mol%, 5.5 to 15.0 mol%, 5.5 to 10.0 mol%, 5.5 to 9.5 mol%, 5.5 to 9.0 mol%, 6.0-15.0 mol%, 6.0-10.0 mol%, 6.0-9.5 mol%, 6.0-9.0 mol%, 6.5-15.0 mol%, 6.5-10.0 mol%, 6.5-9.5 mol%, 6.5-9.0 mol%, 7.0-15.0 mol%, 7.0-10.0 mol%, 7.0-9.5 mol%, 7.0-9.0 mol%, 7.5-15.0 mol%, 7.5-10.0 mol%, 7.5-9.5 mol%, 8.0-15.0 mol%, or 8.0-10.0 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of Na2O in the glass composition can be 15.0 mol% or less, 10.0 mol% or less, 9.5 mol% or less, or 9.0 mol% or less.

[0287] The glass compositions described herein may further include alkali metal oxides other than LiO and NaO, such as KO. KO promotes ion exchange and increases DOC. However, adding KO may result in a too low CTE and too high melting point. In embodiments, the glass composition may include 0.0 to 1.0 mol% KO. In embodiments, the glass composition may include 0.0 to 0.5 mol% KO. In embodiments, the glass composition may include 0.0 to 0.4 mol% KO. In embodiments, the concentration of KO in the glass composition may be in the range of 0.0 to 1.0 mol%, 0.0 to 0.5 mol%, 0.0 to 0.4 mol%, 0.0 to 0.3 mol%, 0.0 to 0.2 mol%, or 0.0 to 0.1 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the glass composition may include up to 1.0 mol% K2O, up to 0.5 mol% K2O, up to 0.4 mol% K2O, up to 0.3 mol% K2O, up to 0.2 mol% K2O, or up to 0.1 mol% K2O.

[0288] The sum of all alkali oxides is represented herein as R2O. Alkali oxides serve to lower the softening point and forming temperature of a glass composition, thereby offsetting the increase in the softening point and forming temperature of a glass composition that results from a higher amount of SiO2 in the glass composition. The reduction in the softening point and forming temperature can be further enhanced by including a combination of alkali oxides (e.g., two or more alkali oxides) in the glass composition, a phenomenon known as the "mixed alkali effect." However, if the amount of alkali oxide is too high, the average thermal expansion coefficient of the glass composition can increase by 100 x 10 -7 / °C, which may be undesirable.

[0289] In an embodiment, the amount of R2O in the glass composition is 11.0 mol% or more and 23.0 mol% or less, 11.0 mol% or more and 22.0 mol% or less, 11.0 mol% or more and 21.0 mol% or less, 11.0 mol% or more and 20.0 mol% or less, 11.0 mol% or more and 19.0 mol% or less, 11.0 mol% or more and 18.0 mol% or less, 11.0 mol% or more and 17.0 mol% or less, 13.0 mol% or more and 23.0 mol% or less, 13.0 mol% or more and 22.0 mol% or less, 13.0 mol% or more and 21.0 mol% or less, 13.0 The amount of R2O in the glass composition may be in the range of 13.0 mol% to 20.0 mol%, 13.0 mol% to 19.0 mol%, 13.0 mol% to 18.0 mol%, 13.0 mol% to 17.0 mol%, 15.0 mol% to 23.0 mol%, 15.0 mol% to 22.0 mol%, 15.0 mol% to 21.0 mol%, 15.0 mol% to 20.0 mol%, 15.0 mol% to 19.0 mol%, 15.0 mol% to 18.0 mol%, or 15.0 mol% to 17.0 mol%. It should be understood that the amount of R2O in the glass composition may be within the range formed by any one of the lower limits for R2O and any one of the upper limits for R2O described herein.

[0290] In addition to being a glass network former, Al2O3 helps increase the ion exchange capacity of the glass composition. Thus, in embodiments, the amount of Al2O3 and components that can be ion-exchanged can be relatively high. For example, Li2O, Na2O, and K2O are ion-exchangeable components. In embodiments, the amount of Al2O3 + R2O in the glass composition can be 26.0 mol% to 40.0 mol%, 28.0 mol% to 40.0 mol%, 30.0 mol% to 40.0 mol%, 32.0 mol% to 40.0 mol%, 34.0 mol% to 40.0 mol%, 26.0 mol% to 38.0 mol%, 28.0 mol% to 38.0 mol%, 3 The total Al2O3 + R2O content can be in the range of 0.0 mol% to 38.0 mol%, 32.0 mol% to 38.0 mol%, 34.0 mol% to 38.0 mol%, 26.0 mol% to 36.0 mol%, 28.0 mol% to 36.0 mol%, 30.0 mol% to 36.0 mol%, 32.0 mol% to 36.0 mol%, or 34.0 mol% to 36.0 mol%. It should be understood that the amount of Al2O3 + R2O in the glass composition can be within the range formed by any one of the lower limits of Al2O3 + R2O and any one of the upper limits of Al2O3 + R2O described herein. Having the total Al2O3 + R2O within the above range provides a tempered glass article with high compressive stress and good diffusivity.

[0291] In an embodiment, the amount of Al2O3 + R2O + B2O3 in the glass composition is 30.0 mol% or more, 32.0 mol% or more, 34.0 mol% or more, 36.0 mol% or more, or 38.0 mol% or more. In an embodiment, the amount of Al2O3 + R2O + B2O3 in the glass composition is 30.0 mol% or more to 40.0 mol% or less, 30.0 mol% or more to 38.0 mol% or less, 30.0 mol% or more to 36.0 mol% or less, 30.0 mol% or more to 34.0 mol% or less, 30.0 mol% or more to 32.0 mol% or less, 32.0 mol% or more to 40.0 mol% or less, or 32.0 mol% or more to 38.0 mol% or more. The Al2O3+R2O+B2O3 content may be in the range of 32.0 mol% to 36.0 mol%, 32.0 mol% to 34.0 mol%, 34.0 mol% to 40.0 mol%, 34.0 mol% to 38.0 mol%, 34.0 mol% to 36.0 mol%, 36.0 mol% to 40.0 mol%, 36.0 mol% to 38.0 mol%, or 38.0 mol% to 40.0 mol%. It should be understood that the amount of Al2O3+R2O+B2O3 in the glass composition may be within the range formed by any one of the lower limits of Al2O3+R2O+B2O3 and any one of the upper limits of Al2O3+R2O+B2O3 described herein. As noted above, the sum of Al2O3 + R2O within the ranges described herein provides high compressive stress and good diffusivity in the tempered glass article, and B2O3 lowers the softening point of the glass composition. Thus, the sum of Al2O3 + R2O + B2O3 within the above ranges allows the glass composition to have good compressive stress upon ion exchange, along with good formability provided by the lower softening point.

[0292] The glass compositions described herein may further contain MgO. MgO can reduce the viscosity of the glass, increase the formability, strain point, and Young's modulus, and improve the ion exchange capacity. However, adding too much MgO to the glass composition increases the density and CTE of the glass composition. In embodiments, the concentration of MgO in the glass composition is 0.0 to 5.0 mol%, 0.0 to 4.5 mol%, 0.0 to 4.0 mol%, 0.0 to 3.5 mol%, 0.0 to 3.0 mol%, 0.0 to 2.5 mol%, 0.0 to 2.0 mol%, 0.0 to 1.5 mol%, 0.5 to 5.0 mol%, 0.5 to 4.5 mol%, 0.5 to 4.0 mol%, 0.5 to 3.5 mol%, or 0.5 to 3.0 mol%. , 0.5-2.5 mol%, 0.5-2.0 mol%, 0.5-1.5 mol%, 1.0-5.0 mol%, 1.0-4.5 mol%, 1.0-4.0 mol%, 1.0-3.5 mol%, 1.0-3.0 mol%, 1.0-2.5 mol%, 1.0-2.0 mol%, or 1.0-1.5 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of MgO is 5.0 mol% or less, 4.5 mol% or less, 4.0 mol% or less, 3.5 mol% or less, 3.0 mol% or less, 2.5 mol% or less, 2.0 mol% or less, or 1.5 mol% or less. In an embodiment, the concentration of MgO in the glass composition may be greater than 0.0 mol% and less than or equal to 3.0 mol%, greater than 0.0 mol% and less than or equal to 2.5 mol%, greater than 0.0 mol% and less than or equal to 2.0 mol%, or greater than 0.0 mol% and less than or equal to 1.5 mol%.

[0293] The glass compositions described herein may further contain CaO. CaO can reduce the viscosity of the glass, increase the formability, strain point, and Young's modulus, and improve the ion exchange capacity. However, adding too much CaO to the glass composition increases the density and CTE of the glass composition. In an embodiment, the concentration of CaO in the glass composition is 0.0 to 5.0 mol%, 0.0 to 4.0 mol%, 0.0 to 3.5 mol%, 0.0 to 3.0 mol%, 0.0 to 2.5 mol%, 0.0 to 2.0 mol%, 0.0 to 1.5 mol%, 0.0 to 1.0 mol%, 0.0 to 0.5 mol%, 0.0 to 0.1 mol%, 0.5 to 5.0 mol%, 0.5 to 4.0 mol%, 0.5 to 3.5 mol%, 0.5 to 3.0 mol%, 0.5 to 2.5 mol%, 0.5 to 2.0 mol%, 0.5 to 1.5 mol%, 0.5 to 1.0 mol%, 1.0 to 5.0 mol%, 1.0 to 4.0 mol%, 1. In an embodiment, the concentration of CaO in the glass composition may be 0 to 3.5 mol%, 1.0 to 3.0 mol%, 1.0 to 2.5 mol%, 1.0 to 2.0 mol%, 1.5 to 5.0 mol%, 1.5 to 4.0 mol%, 1.5 to 3.5 mol%, 1.5 to 3.0 mol%, 1.5 to 2.5 mol%, 1.5 to 2.0 mol%, 2.0 to 5.0 mol%, 2.0 to 4.0 mol%, 2.0 to 3.5 mol%, 2.0 to 3.0 mol%, 2.0 to 2.5 mol%, 2.5 to 5.0 mol%, 2.5 to 4.0 mol%, 2.5 to 3.5 mol%, or 2.5 to 3.0 mol%, or any and all subranges formed from any of these endpoints. In an embodiment, the concentration of CaO in the glass composition may be 0.1 mol% or less. In an embodiment, the concentration of CaO in the glass composition may be greater than 0.0 mol % and less than 0.1 mol %. In an embodiment, the glass composition is substantially free of, or free of, CaO.

[0294] The glass compositions described herein may further include one or more fining agents. In embodiments, the fining agent may include, for example, SnO. In embodiments, the concentration of SnO in the glass composition may be 0.0 to 1.0 mol%, 0.0 to 0.5 mol%, 0.0 to 0.4 mol%, 0.0 to 0.3 mol%, 0.0 to 0.2 mol%, or 0.0 to 0.1 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of SnO in the glass composition may be 0.1 mol% or less. In embodiments, the concentration of SnO in the glass composition may be in the range of greater than 0.0 mol% to 0.1 mol%, greater than 0.0 mol% to 0.5 mol%, or greater than 0.0 mol% to 1.0 mol%. In embodiments, the glass composition is substantially free of, or free of, SnO.

[0295] The glass compositions described herein may further include TiO. TiO improves the UV absorbance of the glass composition. In embodiments, the concentration of TiO in the glass composition may be 0.0 to 2.0 mol%, 0.0 to 1.5 mol%, 0.0 to 1.0 mol%, 0.0 to 0.5 mol%, 0.0 to 0.4 mol%, 0.0 to 0.3 mol%, 0.0 to 0.2 mol%, 0.0 to 0.1 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of TiO in the glass composition may be greater than 0.0 mol% to 1.5 mol% or greater than 0.0 mol% to 2.0 mol%. In embodiments, the glass composition is substantially free of, or free of, TiO.

[0296] The glass compositions described herein may further include Fe2O3. In embodiments, the concentration of Fe2O3 in the glass composition may be 0.0 to 1.0 mol%, 0.0 to 0.5 mol%, 0.0 to 0.4 mol%, 0.0 to 0.3 mol%, 0.0 to 0.2 mol%, or 0.0 to 0.1 mol%, or any and all subranges formed from any of these endpoints. In embodiments, the concentration of Fe2O3 in the glass composition may be 0.1 mol% or less. In embodiments, the concentration of Fe2O3 in the glass composition may be greater than 0.0 mol% and less than or equal to 0.1 mol%. In embodiments, the glass composition is substantially free of, or free of, Fe2O3.

[0297] In embodiments, the glass compositions described herein may further include divalent cation oxides (referred to herein as RO). As used herein, RO includes, but is not limited to, MgO, CaO, SrO, BaO, FeO, and ZnO. In embodiments, the concentration of RO in the glass composition may be 0.0-5.0 mol%, 0.0-4.0 mol%, 0.0-3.0 mol%, 0.0-2.0 mol%, 0.0-1.0 mol%, 1.0-5.0 mol%, 1.0-4.0 mol%, 1.0-3.0 mol%, 1.0-2.0 mol%, 2.0-5.0 mol%, 2.0-4.0 mol%, 2.0-3.0 mol%, 3.0-5.0 mol%, 3.0-4.0 mol%, or 4.0-5.0 mol%, or any and all subranges formed from any of these endpoints.

[0298] In embodiments, the glass composition is peraluminous (i.e., the amount of Al2O3 in the glass composition is greater than the sum of Li2O, Na2O, KO, and MgO), which can increase the Knoop scratch threshold of the glass composition. In embodiments, the glass composition can satisfy the relationship 0.9≦Al2O3 / (RO+RO)≦1.1 to achieve charge balance, which maximizes the strengthening process by increasing diffusivity. However, once the glass composition becomes peraluminous, this charge balance benefit is no longer achieved. Furthermore, an Al2O3 / (RO+RO) ratio greater than 1.0 results in a high melting point and makes processing and forming difficult.

[0299] In embodiments, the glass can be made peraluminous by controlling the amount of LiO in the glass composition. In embodiments, the glass composition can satisfy the relationship -0.1≦(AlO−(RO+RO)) / LiO≦0.3. In embodiments, the glass compositions may satisfy the relationship: -0.1≦(AlO−(R2O+RO)) / LiO≦0.2, -0.1≦(AlO−(R2O+RO)) / LiO≦0.1, -0.1≦(AlO−(R2O+RO)) / LiO≦0.05, 0.0≦(AlO−(R2O+RO)) / LiO≦0.3, 0.0≦(AlO−(R2O+RO)) / LiO≦0.2, 0.0≦(AlO−(R2O+RO)) / LiO≦0.1, or 0.0≦(AlO−(R2O+RO)) / LiO≦0.05. It should be understood that this relationship may fall within a subrange formed from any and all of the aforementioned endpoints.

[0300] In embodiments, glass compositions may satisfy the relationship Al2O3*(10.832)+BO3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100. According to embodiments, glass compositions that satisfy this inequality have a desired fracture toughness. In embodiments, the glass composition may satisfy the relationship Al2O3*(5.99)+BO3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100. According to embodiments, glass compositions that satisfy this inequality have a desired compressive stress. In embodiments, a glass composition may satisfy the relationship Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100. According to embodiments, glass compositions that satisfy this inequality have a desired softening point. It should be understood that a glass composition may satisfy one or more of the above inequalities depending on the embodiment and the desired properties of the glass composition (such as fracture toughness, compressive stress, and softening point).

[0301] In embodiments, the glass compositions described herein may further include a tramp material, for example, sulfur-based compounds such as MnO, MoO, WO, Y2O3, La2O3, CdO, As2O3, Sb2O3, sulfates, halogens, or combinations thereof. In embodiments, antimicrobial components, or other additional components, may be included in the glass composition.

[0302] In an embodiment, the glass composition includes 57.0 mol% to 64.0 mol% SiO2; 17.0 mol% to 19.0 mol% Al2O3; 1.0 mol% to 3.0 mol% P2O5; 0.0 mol% to 5.0 mol% B2O3; 7.5 mol% to 9.0 mol% Li2O; 7.0 mol% to 9.0 mol% Na2O; and 0.0 mol% to 0.3 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 15.0 mol% to 18.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 34.0 mol% to 36.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0303] In an embodiment, the glass composition includes 57.0 mol% to 67.0 mol% SiO2; 15.0 mol% to 18.0 mol% Al2O3; 0.5 mol% to 1.5 mol% P2O5; 2.0 mol% to 7.0 mol% B2O3; 6.0 mol% to 8.0 mol% Li2O; 4.0 mol% to 9.0 mol% Na2O; and 0.0 mol% to 0.3 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 11.0 mol% to 13.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 26.0 mol% to 36.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0304] In an embodiment, the glass composition includes 55.0 mol% to 62.0 mol% SiO2; 10.0 mol% to 19.0 mol% Al2O3; 0.0 mol% to 10.0 mol% P2O5; 2.0 mol% to 8.0 mol% B2O3; 6.0 mol% to 8.0 mol% Li2O; 7.0 mol% to 10.0 mol% Na2O; and 0.0 mol% to 0.5 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 15.0 mol% to 19.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 28.0 mol% to 36.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0305] In an embodiment, the glass composition includes 55.0 mol% to 65.0 mol% SiO2; 14.0 mol% to 20.0 mol% Al2O3; 0.0 mol% to 3.0 mol% P2O5; 1.0 mol% to 7.0 mol% B2O3; 5.0 mol% to 10.0 mol% Li2O; 5.0 mol% to 10.0 mol% Na2O; and 0.0 mol% to 1.0 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 13.0 mol% to 20.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 28.0 mol% to 40.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0306] In an embodiment, the glass composition includes 55.0 mol% to 63.0 mol% SiO2; 15.0 mol% to 19.0 mol% Al2O3; 0.5 mol% to 2.5 mol% P2O5; 2.0 mol% to 6.0 mol% B2O3; 6.0 mol% to 10.0 mol% Li2O; 6.0 mol% to 10.0 mol% Na2O; and 0.0 mol% to 0.5 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 15.0 mol% to 20.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 30.0 mol% to 38.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0307] In an embodiment, the glass composition includes 56.0 mol% to 60.0 mol% SiO2; 16.0 mol% to 18.0 mol% Al2O3; 1.0 mol% to 2.0 mol% P2O5; 3.0 mol% to 5.0 mol% B2O3; 6.0 mol% to 9.0 mol% Li2O; 7.0 mol% to 9.0 mol% Na2O; and 0.0 mol% to 0.1 mol% K2O. The total R2O of all alkali oxides present in the glass composition can be in the range of 15.0 mol% to 17.0 mol%. The sum of Al2O3 and R2O present in the glass composition can be in the range of 32.0 mol% to 36.0 mol%. The glass composition can satisfy the relationship -0.1≦(Al2O3−(R2O+RO)) / Li2O≦0.3.

[0308] We now discuss the physical properties of the alkali aluminosilicate glass compositions disclosed above. These physical properties can be achieved by varying the amounts of the components of the alkali aluminosilicate glass compositions, as discussed in more detail with reference to the examples.

[0309] Articles formed from the glass compositions described herein can have any suitable thickness (t), which can vary depending on the particular application for which the glass is used. The thickness is defined by the opposing first and second surfaces of the glass substrate. Embodiments of the glass article can have a thickness of 0.3 to 3 mm. In embodiments, the glass article can have a thickness of 5.0 mm or less, 4.5 mm or less, 4.0 mm or less, 3.5 mm or less, 3.0 mm or less, 2.5 mm or less, 2.0 mm or less, 1.0 mm or less, 0.9 mm or less, 0.8 mm or less, 0.7 mm or less, 0.6 mm or less, 0.5 mm or less, 0.4 mm or less, 0.3 mm or less, 0.2 mm or less, 0.1 mm or less, 750.0 μm or less, 500.0 μm or less, or 250.0 μm or less. In embodiments, the glass article may have a thickness of 200.0 μm to 5.0 mm, 500.0 μm to 5.0 mm, 200.0 μm to 4.0 mm, 500.0 μm to 4.0 mm, 200.0 μm to 3.0 mm, or 500.0 μm to 3.0 mm. In embodiments, the glass article may have a thickness in the range of 0.1 mm to 5.0 mm, 0.2 to 5.0 mm, 0.3 to 5.0 mm, 0.4 to 5.0 mm, 0.5 to 5.0 mm, 0.1 mm to 3.0 mm, 0.2 to 3.0 mm, 0.3 to 3.0 mm, 0.4 to 3.0 mm, or 0.5 to 3.0 mm. According to embodiments, the glass article has a thickness of greater than or equal to 100 μm and less than or equal to 1000 μm, e.g., greater than or equal to 400 μm and less than or equal to 800 μm, or greater than or equal to 400 μm and less than or equal to 800 μm. It should be understood that the thickness of the article can fall within subranges formed by any and all of the foregoing endpoints.

[0310] In embodiments, the glass compositions described herein may have a density in the range of 2.20 to 2.60, 2.30 to 2.50, 2.30 to 2.45, 2.30 to 2.40, 2.30 to 2.35, 2.35 to 2.50, 2.35 to 2.45, 2.35 to 2.40, 2.40 to 2.50, 2.40 to 2.45, 2.45 to 2.50, or any and all subranges formed from any of these endpoints.

[0311] In an embodiment, the liquidus viscosity of the glass composition is 5.0 kP or more to 175.0 kP or less, 5.0 kP or more to 150.0 kP or less, 5.0 kP or more to 125.0 kP or less, 5.0 kP or more to 100.0 kP or less, 5.0 kP or more to 75.0 kP or less, 5.0 kP or more to 50.0 kP or less, 5.0 kP or more to 25.0 kP or less, 25.0 kP or more to 175.0 kP or less, 25.0 kP or more to 150.0 kP or less, 25.0 kP or more to 150.0 kP or less, 25.0 kP or more to 125.0 kP or less, 25.0 kP or more to 100.0 kP or less, 25.0 kP or more to 75.0 kP or less, 25.0 kP or more to 50. 0 kP or less, 50.0 kP to 175.0 kP, 50.0 kP to 150.0 kP, 50.0 kP to 125.0 kP, 50.0 kP to 100.0 kP, 50.0 kP to 75.0 kP, 75.0 kP to 175.0 kP, 75.0 kP to 150.0 kP, 75.0 kP to 125.0 kP, 75.0 kP to 100.0 kP, 80.0 kP to 100.0 kP, 90.0 kP to 100.0 kP, 75.0 kP to 95.0 kP, or any and all subranges formed from any of these endpoints.

[0312] The softening point of the glass composition is also affected by the addition of lithium to the glass composition. In embodiments, to achieve a desired softening point, the glass composition may satisfy the relationship Al2O3*(4.90)+BO3*(-8.97)+PO5*(-1.87)+Li2O*(-11.26)+Na2O*(-8.29)+KO*(-11.39)+MgO*(-4.69)+CaO*(-7.16)+SrO*(-2.81)<-100. In embodiments, to obtain a desired softening point, the glass composition may satisfy the relationship Al2O3*(4.52)+B2O3*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100. In embodiments, to obtain a desired softening point, the glass composition may satisfy the relationship Al2O3*(4.20)+B2O3*(-7.69)+PO5*(-1.61)+Li2O*(-9.66)+Na2O*(-7.11)+KO*(-9.78)+MgO*(-4.03)+CaO*(-6.14)+SrO*(-2.41)<-100. In an embodiment, the softening point of the glass composition is 650.0°C or more to 950.0°C or less, 650.0°C or more to 925.0°C or less, 650.0°C or more to 905.0°C or less, 650.0°C or more to 900.0°C or less, 650.0°C or more to 850.0°C or less, 650.0°C or more to 800.0°C or less, 650.0°C or more to 750.0°C or less, 650.0°C or more to 700.0°C or less, 650.0°C or more to 690.0°C or less, 660.0°C or more to 680.0°C or less, 675.0°C or more to 700.0°C or less, 700.0°C or more to 950.0°C or less, 750.0°C or more to 800.0°C or less, 650.0°C or more to 850.0°C or less, 650.0°C or more to 800.0°C or less, 650.0°C or more to 750.0°C or less, 650.0°C or more to 700.0°C or less, 650.0°C or more to 690.0°C or less, 660.0°C or more to 680.0°C or less, 675.0°C or more to 700.0°C or less, 700.0°C or more to 950.0°C or less, °C to 925.0°C, 775.0°C to 925.0°C, 790.0°C to 910.0°C, 795.0°C to 905.0°C, 800.0°C to 905.0°C, 800.0°C to 900.0°C, 800.0°C to 875.0°C, 800.0°C to 850.0°C, 800.0°C to 825.0°C, 825.0°C to 875.0°C, 825.0°C to 850.0°C, 850.0°C to 900.0°C, or any and all subranges between the aforementioned values.In embodiments, the softening point of the glass composition may be 950.0°C or less, 925.0°C or less, 900.0°C or less, 875.0°C or less, 860.0°C or less, 850.0°C or less, 825.0°C or less, 800.0°C or less, 750.0°C or less, 700.0°C or less, 675.0°C or less, or 650.0°C or less.

[0313] Fracture toughness (K 1C ) represents the ability of a glass composition to withstand fracture. Fracture toughness is measured by the K 1C Measurements are made on untempered glass articles, such as measuring K values, thereby characterizing the glass substrate prior to IOX. The fracture toughness test method described herein is not suitable for glass exposed to IOX processing. Nevertheless, measurements on a corresponding underlying glass substrate (without IOX processing) provide valuable information about the properties of the IOXed glass. 1CThe chevron-notched short bar (CNSB) method utilized to measure the values ​​is disclosed in Reddy, KPR et al., "Fracture Toughness Measurement of Glass and Ceramic Materials Using Chevron-Notched Specimens," J. Am. Ceram. Soc., 71 [6], C-310-C-313 (1988), except that Y*m is calculated using Equation 5 in Bubsey, RT et al., "Closed-Form Expressions for Crack-Mouth Displacement and Stress Intensity Factors for Chevron-Notched Short Bar and Short Rod Specimens Based on Experimental Compliance Measurements," NASA Technical Memorandum 83796, pp. 1-30 (October 1992). Unless otherwise stated, all fracture toughness values ​​were measured using the chevron-notched short bar (CNSB) method. In the embodiments, the K values ​​of the glass compositions measured using the chevron-notched short bar method are 1C The fracture toughness may be 0.70 or greater, 0.71 or greater, 0.72 or greater, 0.73 or greater, 0.74 or greater, 0.75 or greater, 0.76 or greater, 0.77 or greater, 0.78 or greater, 0.79 or greater, or 0.80 or greater. In embodiments, the K of the glass composition as measured by the chevron notched short bar method 1C The fracture toughness can range from 0.70 to 0.80 or from 0.73 to 0.75. The fracture toughness can be formed from any of the aforementioned endpoints. It should be understood that the range may be within the specified subranges.

[0314] The critical strain energy release rate is the fracture toughness (K 1C ) divided by Young's modulus, which can be a good indicator of the mechanical strength of a glass composition. In embodiments, the desired critical strain energy release rate Gc (J / m 2), the glass composition can satisfy the relationship Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100. In embodiments, to obtain a desired Gc, the glass composition may satisfy the relationship Al2O3*(9.762)+B2O3*(9.313)+PO5*(12.402)+Li2O*(-2.825)+Na2O*(-6.501)+KO*(12.402)+MgO*(1.946)+CaO*(-4.072)+SrO*(-4.072)>100. In embodiments, to obtain a desired Gc, the glass composition may satisfy the relationship Al2O3*(8.885)+B2O3*(8.477)+PO5*(11.288)+Li2O*(-2.571)+Na2O*(-5.917)+KO*(11.288)+MgO*(1.771)+CaO*(-3.706)+SrO*(-3.706)>100.

[0315] From the above, it can be seen that glass compositions according to embodiments can be formed by any suitable method, such as slot forming, float forming, rolling processes, melt forming processes, and the like.

[0316] Glass articles can be characterized by the method by which they are formed. For example, glass articles can be characterized as float formable (i.e., formed by a float process), down drawable, and especially melt formable or slot drawable (i.e., formed by a down draw process such as a fusion draw process or a slot draw process).

[0317] In embodiments, the glass articles described herein can be formed by a down-draw process. The down-draw process produces glass articles with uniform thickness and relatively flawless surfaces. Because the average bending strength of a glass article is controlled by the amount and size of surface flaws, flawless surfaces with minimal contact have higher initial strength. In addition, the downwardly drawn glass product has a very flat and smooth surface that can be used for its end use without expensive grinding and polishing.

[0318] In embodiments, the glass article can be described as fusion-formable (i.e., formable using the fusion draw process). The fusion process uses a drawing tank having a channel for receiving molten glass frit. The channel has open-topped weirs on either side of the channel along the length of the channel. When the channel is filled with molten material, the molten glass overflows the weirs. Due to gravity, the molten glass flows down the exterior surfaces of the drawing tank as two flowing glass films. These exterior surfaces of the drawing tank extend downward and inward to meet at the lower edge of the drawing tank. The two flowing glass films meet at this edge and fuse to form a single flowing glass article. The fusion draw process offers the advantage that, because the two glass films flowing over the channel fuse together, neither exterior surface of the resulting glass article comes into contact with any part of the equipment. Thus, the surface properties of the fusion-drawn glass article are not affected by such contact.

[0319] In embodiments, the glass articles described herein can be formed by a slot draw process. The slot draw process is different from the fusion draw process. In the slot draw process, molten raw glass is fed into a drawing tank. The bottom of the drawing tank has an open slot with a nozzle extending the length of the slot. The molten glass flows through the slot / nozzle and is drawn downward into an annealing zone as a continuous glass product.

[0320] As noted above, in embodiments, alkali aluminosilicate glass compositions can be strengthened, such as by ion exchange, to create damage-resistant glasses for applications such as, but not limited to, display cover glasses. Referring to FIG. 5 , the glass has a first region under compressive stress (e.g., first and second compressive layers 120, 122 in FIG. 5 ) extending from the surface of the glass to the DOC, and a second region under tensile stress or CT (e.g., central region 130 in FIG. 5 ) extending from the DOC to a central or interior region of the glass. First segment 120 extends from first surface 110 to a depth d1, and second segment 122 extends from second surface 112 to a depth d2. Together, these segments define the compression or CS of glass 100.

[0321] In an embodiment, the CS of the glass composition is 450.0 MPa or more to 950.0 MPa or less, 450.0 MPa or more to 900.0 MPa or less, 450.0 MPa or more to 850.0 MPa or less, 450.0 MPa or more to 800.0 MPa or less, 450.0 MPa or more to 750.0 MPa or less, 450.0 MPa or more to 700.0 MPa or less, 450.0 MPa or more to 650.0 MPa or less, 450.0 MPa or more to 600.0 MPa or less, 450.0 MPa or more to 550.0 MPa or less, 500.0 MPa or more to 950.0 MPa or less, 500.0 MPa or more ~900.0MPa or less, 500.0MPa or more ~ ​​850.0MPa or less, 500.0MPa or more ~ ​​800.0MPa or less, 500.0MPa or more ~ ​​750.0MPa or less, 500.0MPa or more ~ ​​700.0MPa or less, 500.0MPa or more ~ ​​650.0MPa or less, 500.0MPa or more ~ ​​600.0MPa or less, 550.0MPa or more ~ ​​950.0MPa or less, 550.0MPa or more ~ ​​900.0MPa or less, 550.0MPa or more ~ ​​850.0MPa or less, 550.0MPa or more ~ ​​800.0MPa or less, 550.0MPa or more ~ ​​750.0MPa or less MPa or less, 550.0MPa or more to 700.0MPa or less, 550.0MPa or more to 650.0MPa or less, 600.0MPa or more to 950.0MPa or less, 600.0MPa or more to 900.0MPa or less, 600.0MPa or more to 850.0MPa or less, 600.0MPa or more to 800.0MPa or less, 600.0MPa or more to 750.0MPa or less, 600.0MPa or more to 700.0MPa or less, 650.0MPa or more to 950.0MPa or less, 650.0MPa or more to 900.0MPa or less, 650.0MPa or more to 850.0MPa or less, 650.0MPa or more to 800.0MPa or less, 650.0MPa or more to 750.0MPa or less, 700.0MPa or more to 950.0MPa or less, 700.0MPa or more to 900.0MPa or less, 700.0MPa or more to 850.0MPa or less, 700.0MPa or more to 800.0MPa or less, 750.0MPa or more to 950.0MPa or less, 750.0MPa or more to 900.0MPa or less, 750.0MPa or more to 850.0MPa or less, 800.0MPa or more to 950.0MPa or less, 800.0MPa or more to 900.0MPa or less, or 850.The CS of the glass composition may be in the range of 0 MPa or more to 950.0 MPa or less, or any and all subranges between the aforementioned values. In embodiments, the CS of the glass composition may be 450.0 MPa or more, 500.0 MPa or more, 550.0 MPa or more, 600.0 MPa or more, 650.0 MPa or more, 700.0 MPa or more, 750.0 MPa or more, 800.0 MPa or more, 850.0 MPa or more, or 900.0 MPa or more.

[0322] In an embodiment, in order to obtain a desired maximum CT, the glass composition can satisfy 0.95 < Al2O3*(5.9) - B2O3*(3.8) - P2O5*(8.3) + Li2O*(8.5) - Na2O*(4.6) - K2O*(10) + (MgO + CaO + SrO + ZnO)*(1.8) < 1.5. In an embodiment, in order to obtain a desired maximum CT, the glass composition can satisfy the relationship of Al2O3*(6.31) + B2O3*(-4.05) + P2O5*(-8.89) + Li2O*(9.11) + Na2O*(-4.90) + K2O*(-10.73) + MgO*(1.96) + CaO*(1.96) + SrO*(1.96) > 100. In an embodiment, in order to obtain a desired maximum CT, the glass composition can satisfy the relationship of Al2O3*(5.99) + B2O3*(-3.85) + P2O5*(-8.44) + Li2O*(8.65) + Na2O*(-4.65) + K2O*(-10.18) + MgO*(1.86) + CaO*(1.86) + SrO*(1.86) > 100. In an embodiment, in order to obtain a desired maximum CT, the glass composition can satisfy the relationship of Al2O3*(5.70) + B2O3*(-3.66) + P2O5*(-8.03) + Li2O*(8.23) + Na2O*(-4.43) + K2O*(-9.69) + MgO*(1.77) + CaO*(1.77) + SrO*(1.77) > 100. In an embodiment, the maximum CT of the glass composition can be in the range of 20.0 MPa or more to 150.0 MPa or less, 25.0 MPa or more to 125.0 MPa or less, 50.0 MPa or more to 125.0 MPa or less, 60.0 MPa or more to 100.0 MPa or less, 70.0 MPa or more to 100.0 MPa or less, 80.0 MPa or more to 100.0 MPa or less, 90.0 MPa or more to 100.0 MPa or less, 60.0 MPa or more to 90.0 MPa or less, 70.0 MPa or more to 90.0 MPa or less, 80.0 MPa or more to 90.0 MPa or less, 60.0 MPa or more to 80.0 MPa or less, 70.0 MPa or more to 80.0 MPa or less, 60.0 MPa or more to 70.0 MPa or less, or any sub-range between the aforementioned values.In embodiments, the maximum CT of the glass composition may be 20.0 MPa or more, 50.0 MPa or more, 60.0 MPa or more, 65.0 MPa or more, 70.0 MPa or more, to 75.0 MPa or more, 80.0 MPa or more, 85.0 MPa or more, 90.0 MPa or more, 95.0 MPa or more, or 100.0 MPa or more.

[0323] In embodiments, the DOC of the glass composition may be in the range of 0.13t to 0.30t (where t is the thickness of the article), 0.13t to 0.28t, 0.13t to 0.26t, 0.13t to 0.24t, 0.13t to 0.22t, 0.13t to 0.20t, 0.13t to 0.18t, 0.15t to 0.30t, 0.15t to 0.28t, 0.15t to 0.26t, 0.15t to 0.24t, 0.15t to 0.22t, 0.15t to 0.20t, 0.15t to 0.18t, or any and all subranges between the foregoing values. In embodiments, the DOC of the glass composition may be 0.13t or greater (where t is the thickness of the article), 0.14t or greater, 0.15t or greater, 0.16t or greater, 0.17t or greater, 0.18t or greater, 0.19t or greater, 0.20t or greater, 0.21t or greater, 0.22t or greater, 0.23t or greater, 0.24t or greater, 0.25t or greater, 0.26t or greater, 0.27t or greater, 0.28t or greater, 0.29t or greater, or 0.30t or greater.

[0324] In an embodiment, the DOL of the glass composition is 1.0 μm or more to 25.0 μm or less, 5.0 μm or more to 20.0 μm or less, 5.0 μm or more to 18.0 μm or less, 5.0 μm or more to 15.0 μm or less, 5.0 μm or more to 12.0 μm or less, 5.0 μm or more to 10.0 μm or less, 7.0 μm or more to 20.0 μm or less, 7.0 μm or more to 18.0 μm or less, 7.0 μm or more to 15.0 μm or less, 7.0 μm or more to 12.0 μm or less, 7.0 μm or more to 10.0 μm or less, 10.0 μm or more The DOL may be in the range of 5.0 μm or more to 20.0 μm or less, 10.0 μm or more to 18.0 μm or less, 10.0 μm or more to 15.0 μm or less, 10.0 μm or more to 12.0 μm or more, 12.0 μm or more to 20.0 μm or less, 12.0 μm or more to 18.0 μm or less, 12.0 μm or more to 15.0 μm or more, 15.0 μm or more to 20.0 μm or less, 15.0 μm or more to 18.0 μm or more, or 18.0 μm or more to 20.0 μm or less, or any and all subranges therebetween. In embodiments, the DOL may be 5.0 μm or more, 7.0 μm or more, 10.0 μm or more, 12.0 μm or more, 15.0 μm or more, 18.0 μm or more, or 25.0 μm or more.

[0325] In embodiments, the glass compositions may have a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater (where t is the thickness of the article), and a depth of layer of 5.0 μm or greater. In embodiments, the glass compositions may have a compressive stress of 600.0 MPa or greater, a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater. In embodiments, the glass composition has a compressive stress of 450.0 MPa or greater, 500.0 MPa or greater, 550.0 MPa or greater, 600.0 MPa or greater, 650.0 MPa or greater, 700.0 MPa or greater, 750.0 MPa or greater, 800.0 MPa or greater, 850.0 MPa or greater, or 900.0 MPa or greater; and a maximum central tension of 0.13t or greater, 0.14t or greater, 0.15t or greater, 0.16t or greater, 0.17t or greater, 0.18t or greater, 0.19t or greater, 0.20t or greater, 0.21t or greater, 0.22t or greater, 0.23t or greater, 0.24t or greater, 0.25t or greater, 0.26t or greater, 0.27t or greater, 0.28t or greater, 0.29t or greater, or 0.30t or greater; and a DOL of 5.0 μm or greater, 7.0 μm or greater, 10.0 μm or greater, 12.0 μm or greater, 15.0 μm or greater, 18.0 μm or greater, or 25.0 μm or greater.

[0326] In embodiments, the glass compositions may have high crack and scratch resistance, as indicated by a Knoop scratch threshold of at least 6.0 N. In embodiments, the glass compositions may have a Knoop scratch threshold in the range of 6.0 N to 12.0 N. According to embodiments, the Knoop scratch threshold may be greater than or equal to 6.0 N and less than or equal to 9.0 N, e.g., greater than or equal to 6.0 N and less than or equal to 12.0 N, greater than or equal to 7.0 N and less than or equal to 12.0 N, greater than or equal to 7.0 N and less than or equal to 11.0 N, or greater than or equal to 7.0 N and less than or equal to 10.0 N. It should be understood that the Knoop scratch threshold of the glass-ceramic may fall within any and all subranges formed by any and all of the foregoing endpoints.

[0327] In embodiments, the glass compositions may have a breakage height of 100.0 cm or greater, 110.0 cm or greater, 120.0 cm or greater, 130.0 cm or greater, 140.0 cm or greater, 150.0 cm or greater, 160.0 cm or greater, 170.0 cm or greater, 180.0 cm or greater, 190.0 cm or greater, or 200.0 cm or greater, measured on an article having a thickness of 0.5 mm according to a drop test method on 180 grit sandpaper. In embodiments, the glass compositions may have a breakage height in the range of 100.0 cm to 200.0 cm, 120.0 cm to 180.0 cm, 140.0 cm to 160.0 cm, or 145.0 cm to 155.0 cm, measured on an article having a thickness of 0.5 mm according to a drop test method on 180 grit sandpaper. In embodiments, the glass compositions may have a breakage height of 150.0 cm or greater, 160.0 cm or greater, 170.0 cm or greater, 180.0 cm or greater, 190.0 cm or greater, or 200.0 cm or greater, measured on an article having a thickness of 0.6 mm according to a drop test method on 180 grit sandpaper. In embodiments, the glass compositions may have a breakage height in the range of 150.0 cm to 200.0 cm, 160.0 cm to 190.0 cm, 165.0 cm to 185.0 cm, or 170.0 cm to 180.0 cm, measured on an article having a thickness of 0.6 mm according to a drop test method on 180 grit sandpaper.

[0328] In embodiments, the glass composition may have a residual strength of 150.0 MPa or greater, 175.0 MPa or greater, 200.0 MPa or greater, or 225.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N. In embodiments, the glass composition may have a residual strength in the range of 150.0 MPa or greater to 250.0 MPa or less, 175.0 MPa or greater to 225.0 MPa or less, or 190.0 MPa or greater to 210.0 MPa or less, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N. In embodiments, the glass composition may have a residual strength of 150.0 MPa or greater, 175.0 MPa or greater, 200.0 MPa or greater, 225.0 MPa or greater, or 250.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N. In embodiments, the glass composition may have a residual strength in the range of 150.0 MPa to 300.0 MPa, 175.0 MPa to 275.0 MPa, or 200.0 MPa to 250.0 MPa, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N. In embodiments, the glass composition may have a residual strength of 200.0 MPa or greater, 225.0 MPa or greater, 250.0 MPa or greater, or 270.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N. In embodiments, the glass composition may have a residual strength in the range of 200.0 MPa to 300.0 MPa, 225.0 MPa to 290.0 MPa, or 250.0 MPa to 270.0 MPa, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0329] The glass composition can be exposed to an ion exchange solution (e.g., a KNO and / or NaNO molten salt bath) by immersing a glass article made from the glass composition in a bath of the ion exchange solution, spraying the ion exchange solution onto a glass article made from the glass composition, or otherwise physically applying the ion exchange solution to a glass article made from the glass composition. When exposed to the glass composition, the ion exchange solution, according to embodiments, may be at a temperature in the range of 350.0°C to 500.0°C, 360.0°C to 450.0°C, 370.0°C to 440.0°C, 360.0°C to 420.0°C, 370.0°C to 400.0°C, 375.0°C to 475.0°C, 400.0°C to 500.0°C, 410.0°C to 490.0°C, 420.0°C to 480.0°C, 430.0°C to 470.0°C, or 440.0°C to 460.0°C, or any and all subranges between the foregoing values. In embodiments, the glass composition can be exposed to the ion exchange solution for a period of 2 to 48 hours, 2 to 24 hours, 2 to 12 hours, 2 to 6 hours, 8 to 44 hours, 12 to 40 hours, 16 to 36 hours, 20 to 32 hours, or 24 to 28 hours, or any and all subranges between the foregoing values. The glass compositions described herein can undergo a single ion exchange process, a double ion exchange process, or multiple ion exchange processes. After undergoing a single ion exchange process, the glass compositions described herein have similar properties to conventional glass compositions that have undergone multiple ion exchange processes.

[0330] The ion exchange process can be carried out in an ion exchange solution under processing conditions that result in an improved compressive stress profile, as disclosed, for example, in U.S. Patent Application Publication No. 2016 / 0102011, which is incorporated herein by reference in its entirety.

[0331] It should be understood that after the ion exchange process has been performed, the composition of the surface of the glass article may differ from the composition of the as-formed glass article (i.e., the glass article before being subjected to the ion exchange process). + or Na + One type of alkali metal ion in the as-formed glass, e.g., Na + or K + However, the glass composition at or near the center of the depth of the glass article will, in embodiments, have the composition of the as-formed (non-ion exchanged) glass utilized in forming the glass article.

[0332] The glass articles disclosed herein can be incorporated into another article, such as an article or articles with a display (e.g., consumer electronics, including cell phones, tablets, computers, navigation systems, etc.), a building product, a transportation product (e.g., automobiles, trains, aircraft, watercraft, etc.), a household appliance product, or any article requiring some degree of transparency, scratch resistance, abrasion resistance, or a combination thereof. An exemplary article incorporating any of the glass articles disclosed herein is shown in FIGS. 6A and 6B. Specifically, FIGS. 6A and 6B show a consumer electronics device 200 including a housing 202 having a front surface 204, a back surface 206, and sides 208; electrical components (not shown) at least partially within or entirely within the housing, including at least a controller, memory, and a display 210 at or adjacent the front surface of the housing; and a cover substrate 212 at or on the front surface of the housing so as to overlie the display. In embodiments, a portion of the cover substrate 212 and / or a portion of the housing 202 may include any of the glass articles disclosed herein. [Example]

[0333] The embodiments of the glass compositions described herein will be further clarified by the following examples.

[0334] Table 1 shows the glass compositions (in mole percent) of the examples and comparative examples, as well as the properties of each of the glass compositions. Glasses having compositions 1 to 115 and comparative compositions 1 to 16 listed in Table 1 were formed.

[0335] Table 2 shows the CS, DOL, and CT of Comparative Glass Compositions 1 to 4 and Examples 1 to 10 and 100 to 102 after glass articles made from the glass compositions were subjected to an ion exchange solution at a temperature of 380°C for 2 hours. The ion exchange solution applied to Comparative Glass Compositions 1 and 2 and Examples 1 to 10 was a molten salt bath of 80% by mass KNO3 / 20% by mass NaNO3. The ion exchange solution applied to Comparative Glass Compositions 3 and 4 and Examples 100 to 102 was a molten salt bath of 95% by mass KNO3 / 5% by mass NaNO3.

[0336] Table 3 shows the CS, DOL, and CT of Comparative Glass Compositions 1 and 2, and Example Glass Compositions 1 to 10 after glass articles made from the Example Glass Compositions were subjected to an ion exchange solution at a temperature of 380° C. for 3 hours. The ion exchange solution applied to Comparative Glass Compositions 1 and 2 and Example Glass Compositions 1 to 10 was a molten salt bath of 80 wt% KNO3 / 20 wt% NaNO3.

[0337] Table 4 shows the CS, DOL, and CT of Comparative Glass Compositions 1 to 4 and Examples 1 to 10 and 100 to 102 after glass articles made from the glass compositions were subjected to an ion exchange solution at a temperature of 380°C for 4 hours. The ion exchange solution applied to Comparative Glass Compositions 1 and 2 and Examples 1 to 10 was a molten salt bath of 80% by mass KNO3 / 20% by mass NaNO3. The ion exchange solution applied to Comparative Glass Compositions 3 and 4 and Examples 100 to 102 was a molten salt bath of 95% by mass KNO3 / 5% by mass NaNO3.

[0338] Table 5 shows the CS, DOL, and CT of Comparative Glass Compositions 3 and 4, and Example Glass Compositions 100-102 after glass articles made from the Example Glass Compositions were subjected to an ion exchange solution at a temperature of 380° C. for 6 hours. The ion exchange solution applied to Comparative Glass Compositions 3 and 4 and Example Glass Compositions 100-102 was a molten salt bath of 95 wt% KNO / 5 wt% NaNO.

[0339] Table 6 shows the CS, DOL, and CT of Comparative Glass Compositions 5 to 16 and Example Glass Compositions 29 to 34 and 37 to 99 after glass articles made from the Example glass compositions were subjected to an ion exchange solution at a temperature of 430° C. for 4 hours. The ion exchange solution applied to Comparative Glass Compositions 5 to 16 and Example Glass Compositions 29 to 34 and 37 to 99 was a molten salt bath of 80 wt% KNO3 / 20 wt% NaNO3.

[0340] Table 7 shows the CS, DOL, and CT of Comparative Glass Compositions 5 to 16 and Example Glass Compositions 29 to 34 and 37 to 99 after glass articles made from the Example glass compositions were subjected to an ion exchange solution at a temperature of 430° C. for 8 hours. The ion exchange solution applied to Comparative Glass Compositions 5 to 16 and Example Glass Compositions 29 to 34 and 37 to 99 was a molten salt bath of 80 wt% KNO3 / 20 wt% NaNO3.

[0341] Table 8 shows the CS, DOL, and CT of Comparative Glass Compositions 5-16 and Example Glass Compositions 29-34 and 37-99 after glass articles made from the glass compositions were subjected to an ion exchange solution at a temperature of 430°C for 12 hours. Each property was measured by testing a glass having a thickness of 0.8 mm. The ion exchange solution applied to Comparative Glass Compositions 5-16 and Example Glass Compositions 29-34 and 37-99 was a molten salt bath of 80 wt% KNO3 / 20 wt% NaNO3.

[0342] [Table 1-1]

[0343]

Table 1-2

[0344]

Table 1-3

[0345]

Table 1-4

[0346]

Table 1-5

[0347]

Table 1-6

[0348]

Table 1-7

[0349]

Table 1-8

[0350]

Table 1-9

[0351]

Table 1-10

[0352]

Table 1-11

[0353]

Table 1-12

[0354]

Table 1-13

[0355]

Table 1-14

[0356]

Table 1-15

[0357]

Table 2-1

[0358]

Table 2-2

[0359]

Table 2-3

[0360]

Table 3-1

[0361]

Table 3-2

[0362]

Table 4-1

[0363]

Table 4-2

[0364]

Table 4-3

[0365]

Table 5

[0366]

Table 6-1

[0367]

Table 6-2

[0368]

Table 6-3

[0369]

Table 6-4

[0370]

Table 6-5

[0371]

Table 6-6

[0372]

Table 6-7

[0373]

Table 6-8

[0374]

Table 6-9

[0375]

Table 6-10

[0376]

Table 6-11

[0377]

Table 7-1

[0378]

Table 7-2

[0379]

Table 7-3

[0380]

Table 7-4

[0381]

Table 7-5

[0382]

Table 7-6

[0383]

Table 7-7

[0384]

Table 7-8

[0385]

Table 7-9

[0386]

Table 7-10

[0387]

Table 7-11

[0388]

Table 8-1

[0389]

Table 8-2

[0390]

Table 8-3

[0391]

Table 8-4

[0392]

Table 8-5

[0393]

Table 8-6

[0394] [Table 8-7]

[0395] [Table 8-8]

[0396] [Table 8-9]

[0397] [Table 8-10]

[0398] [Table 8-11]

[0399] Table 9 shows the Knoop scratch threshold data for glass articles made from Example glass composition 110 and Comparative Example 1. As shown, the glass article made from Example glass composition 110 has a higher Knoop scratch threshold than Comparative Example 1.

[0400] [Table 9]

[0401] Figure 7 shows the average breakage heights of articles made from Example glass composition 110 and Comparative Example 1, each having a thickness of 0.5 mm and dropped onto 180-grit sandpaper. As shown in Figure 7, the articles made from Example glass composition 110 had breakage heights ranging from 50.0 cm to 100.0 cm, with an average of 77.0 cm. The articles made from Comparative Example 1 had breakage heights ranging from 35.0 cm to 65.0 cm, with an average of 50.0 cm.

[0402] Figure 8 shows the average breakage heights of articles made from Example glass composition 110 and Comparative Example 1, each having a thickness of 0.6 mm and dropped onto 180-grit sandpaper. As shown in Figure 8, the articles made from Example glass composition 110 had breakage heights ranging from 125.0 cm to 175.0 cm, with an average of 154.0 cm. The articles made from Comparative Example 1 had breakage heights ranging from 60.0 cm to 125.0 cm, with an average of 108.0 cm.

[0403] FIG. 9 shows the residual strength of an article made from the example glass composition 110 and an article made from comparative example 1. As shown in FIG. 9, the article made from example glass composition 110 had a residual strength ranging from 175.0 MPa to 225.0 MPa when impacted with 80-grit sandpaper at a force of 500.0 N. The article made from comparative example 1 had a residual strength ranging from 150.0 MPa to 170.0 MPa when impacted with 80-grit sandpaper at a force of 500.0 N. The article made from example glass composition 110 had a residual strength ranging from 175.0 MPa to 275.0 MPa when impacted with 120-grit sandpaper at a force of 500.0 N. The article made from comparative example 1 had a residual strength ranging from 170.0 MPa to 190.0 MPa when impacted with 120-grit sandpaper at a force of 500.0 N. Articles made from Example Glass Composition 110 had a residual strength in the range of 250.0 MPa to 270.0 MPa when impacted with 180-grit sandpaper at a force of 500.0 N. Articles made from Comparative Example 1 had a residual strength in the range of 2000.0 MPa to 208.0 MPa when impacted with 180-grit sandpaper at a force of 500.0 N.

[0404] It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments described herein without departing from the spirit and scope of the claimed subject matter. Thus, it is intended that the present specification cover modifications and variations of the various embodiments described herein, provided that such modifications and variations come within the scope of the appended claims and their equivalents.

[0405] Preferred embodiments of the present invention will be described below in detail.

[0406] Embodiment 1 1. A glass composition comprising: 50.0 mol% or more and 70.0 mol% or less of SiO2; 10.0 mol% or more and 25.0 mol% or less Al2O3; 0.0 mol% or more and 5.0 mol% or less P2O3; 0.0 mol% or more and 10.0 mol% or less B2O3; 5.0 mol% or more and 15.0 mol% or less of Li2O; 1.0 mol% or more and 15.0 mol% or less NaO; and 0.0 mol% or more and 1.0 mol% or less of K2O where: R2O is in the range of 11.0 mol % or more and 23.0 mol % or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 26.0 mol% or more and 40.0 mol% or less; and -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R0 is the total alkaline earth metal oxides in the glass composition; Glass composition.

[0407] Embodiment 2 2. The glass composition according to embodiment 1, wherein R2O is in the range of 15.0 mol % or more and 19.0 mol % or less.

[0408] Embodiment 3 The glass composition according to embodiment 1 or 2, wherein Al2O3+R2O is in the range of 28.0 mol % or more and 36.0 mol % or less.

[0409] Embodiment 4 4. The glass composition according to any one of claims 1 to 3, wherein 0.0≦(Al2O3−(R2O+RO)) / Li2O≦0.1.

[0410] Embodiment 5 5. The glass composition according to any one of claims 1 to 4, wherein 0.9≦Al2O3 / (R2O+RO)≦1.1.

[0411] Embodiment 6 6. The glass composition according to any one of claims 1 to 5, wherein Al2O3 + R2O + B2O3 is 32.0 mol% or more.

[0412] Embodiment 7 7. The glass composition according to any one of claims 1 to 6, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0413] Embodiment 8 8. The glass composition of embodiment 7, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0414] Embodiment 9 9. The glass composition of embodiment 8, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0415] Embodiment 10 10. The glass composition of any of claims 1 to 9, further comprising up to 5.0 mol% MgO.

[0416] Embodiment 11 11. The glass composition according to any one of embodiments 1 to 10, further comprising 0.0 mol % to 2.0 mol % of TiO2.

[0417] Embodiment 12 12. The glass composition according to any one of claims 1 to 11, further comprising 0.0 mol% to 1.0 mol% SnO2.

[0418] Embodiment 13 13. The glass composition of any of the preceding claims, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0419] Embodiment 14 13. The glass composition of any of the preceding claims, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0420] Embodiment 15 13. The glass composition according to any one of claims 1 to 12, wherein Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0421] Embodiment 16 16. The glass composition according to any one of embodiments 1 to 15, wherein the glass composition has a density in the range of 2.20 or more and 2.60 or less.

[0422] Embodiment 17 17. The glass composition according to any one of embodiments 1 to 16, wherein the glass composition has a liquidus viscosity in the range of 5.0 kP or more and 175.0 kP or less.

[0423] Embodiment 18 18. The glass composition according to any one of embodiments 1 to 17, wherein the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0424] Embodiment 19 19. The glass composition according to embodiment 18, wherein the glass composition has a softening point in the range of 750.0°C or higher and 925.0°C or lower.

[0425] Embodiment 20 20. The glass composition according to embodiment 19, wherein the glass composition has a softening point in the range of 790.0°C or more and 910.0°C or less.

[0426] Embodiment 21 18. The glass composition of any one of claims 1 to 17, wherein the glass composition has a softening point of 900.0°C or less.

[0427] Embodiment 22 22. The glass composition of claim 21, wherein the glass composition has a softening point of 875.0°C or less.

[0428] Embodiment 23 23. The glass composition of claim 22, wherein the glass composition has a softening point of 860.0° C. or less.

[0429] Embodiment 24 The glass composition has a K of 0.70 or more as measured by a chevron notched short bar method. 1C 24. A glass-based article comprising the glass composition of any of claims 1 to 23, having fracture toughness.

[0430] Embodiment 25 The glass composition has a K of 0.73 or more as measured by a chevron notched short bar method. 1C 25. The glass-based article of embodiment 24, having fracture toughness.

[0431] Embodiment 26 24. A glass-based article comprising the glass composition of any of claims 1 to 23, wherein the glass-based article is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0432] Embodiment 27 27. The glass-based article of embodiment 26, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO at a temperature of 350.0°C to 500.0°C for a period of 2 hours to 12 hours.

[0433] Embodiment 28 28. The glass-based article of claim 27, wherein the ion exchange bath further comprises NaNO.

[0434] Embodiment 29 29. The glass-based article of any of claims 26 to 28, wherein the tempered glass-based article has a compressive stress of 600 MPa or greater.

[0435] Embodiment 30 30. The glass-based article of any one of claims 26 to 29, wherein the tempered glass-based article has a maximum central tension of 20.0 MPa or greater.

[0436] Embodiment 31 31. The glass-based article of claim 30, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0437] Embodiment 32 32. The glass-based article of any of claims 26-31, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article.

[0438] Embodiment 33 33. The glass-based article of claim 32, wherein the strengthened glass-based article has a compression depth of 0.18t or greater.

[0439] Embodiment 34 34. The glass-based article of any of claims 26 to 33, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0440] Embodiment 35 35. The glass-based article of claim 34, wherein the strengthened glass-based article has a depth of layer of 10.0 μm or greater.

[0441] Embodiment 36 29. The glass-based article of any of claims 26 to 28, wherein the tempered glass-based article has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article, and a depth of layer of 5.0 μm or greater.

[0442] Embodiment 37 37. The glass-based article of claim 36, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0443] Embodiment 38 38. The glass-based article of any one of embodiments 26 to 37, wherein the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0444] Embodiment 39 38. The glass-based article of any one of claims 26 to 37, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0445] Embodiment 40 40. The glass-based article of any of claims 26 to 39, wherein the strengthened glass-based article has a breakage height of 100.0 cm or greater as measured on a glass-based article having a thickness of 0.5 mm according to a drop test method on 180 grit sandpaper.

[0446] Embodiment 41 41. The glass-based article of claim 40, wherein the strengthened glass-based article has a break height of 120.0 cm or greater.

[0447] Embodiment 42 42. The glass-based article of claim 41, wherein the strengthened glass-based article has a break height of 150.0 cm or greater.

[0448] Embodiment 43 40. The glass-based article of any of claims 26 to 39, wherein the strengthened glass-based article has a break height of 150.0 cm or greater, measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0449] Embodiment 44 44. The glass-based article of claim 43, wherein the strengthened glass-based article has a break height of 180.0 cm or greater.

[0450] Embodiment 45 45. The glass-based article of claim 44, wherein the strengthened glass-based article has a break height of 200.0 cm or greater.

[0451] Embodiment 46 46. ​​The glass-based article of any of claims 26 to 45, wherein the tempered glass-based article has a retained strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0452] Embodiment 47 47. The glass-based article of claim 46, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0453] Embodiment 48 48. The glass-based article of claim 47, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0454] Embodiment 49 46. ​​The glass-based article of any of claims 26 to 45, wherein the tempered glass-based article has a retained strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0455] Embodiment 50 50. The glass-based article of claim 49, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0456] Embodiment 51 51. The glass-based article of claim 50, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0457] Embodiment 52 46. ​​The glass-based article of any of claims 26 to 45, wherein the tempered glass-based article has a retained strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0458] Embodiment 53 53. The glass-based article of claim 52, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0459] EMBODIMENT 54 54. The glass-based article of claim 53, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0460] Embodiment 55 1. A consumer electronic device comprising: a housing having a front, a back, and sides; an electrical component disposed at least partially within the housing, the electrical component including at least a controller, a memory, and a display, the display being disposed on or adjacent to the front surface of the housing; Including, The glass composition or glass-based article of any one of claims 1 to 54 is disposed over the display, forms at least a part of the housing, or is disposed over the display and forms at least a part of the housing. Consumer electronic devices.

[0461] Embodiment 56 1. A glass composition comprising: 55.0 mol% or more and 65.0 mol% or less of SiO2; 14.0 mol% or more and 20.0 mol% or less Al2O3; 0.0 mol% or more and 3.0 mol% or less P2O3; 1.0 mol% or more and 7.0 mol% or less B2O3; 5.0 mol% or more and 10.0 mol% or less of Li2O; 5.0 mol% or more and 10.0 mol% or less NaO; and 0.0 mol% or more and 1.0 mol% or less of K2O where: R2O is in the range of 13.0 mol % or more and 20.0 mol % or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 28.0 mol% or more and 40.0 mol% or less; and -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R0 is the total alkaline earth metal oxides in the glass composition; Glass composition.

[0462] Embodiment 57 57. The glass composition according to embodiment 56, wherein R2O is in the range of 15.0 mol % to 18.0 mol %.

[0463] Embodiment 58 58. The glass composition according to embodiment 56 or 57, wherein Al2O3+R2O is in the range of 32.0 mol % or more and 36.0 mol % or less.

[0464] Embodiment 59 59. The glass composition according to any one of claims 56 to 58, wherein 0.0≦(Al2O3−(R2O+RO)) / Li2O≦0.1.

[0465] Embodiment 60 60. The glass composition according to any one of claims 56 to 59, wherein 0.9≦Al2O3 / (R2O+RO)≦1.1.

[0466] Embodiment 61 61. The glass composition of any of embodiments 56 to 60, wherein Al2O3 + R2O + B2O3 is 32.0 mol% or greater.

[0467] Embodiment 62 62. The glass composition according to any one of claims 56 to 61, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0468] Embodiment 63 63. The glass composition of embodiment 62, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0469] EMBODIMENT 64 64. The glass composition of embodiment 63, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0470] Embodiment 65 65. The glass composition of any of embodiments 56 to 64, further comprising up to 3.0 mol% MgO.

[0471] Embodiment 66 66. The glass composition of any of embodiments 56 to 65, further comprising 0.0 mol % to 1.0 mol % TiO2.

[0472] Embodiment 67 67. The glass composition of any of embodiments 56 to 66, further comprising 0.0 mol % to 1.0 mol % SnO2.

[0473] Embodiment 68 68. The glass composition of any of claims 56 to 67, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0474] Embodiment 69 68. The glass composition of any of claims 56 to 67, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0475] Embodiment 70 68. The glass composition of any of claims 56 to 67, wherein Al2O3*(4.52)+BO*(-8.28)+PO5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0476] Embodiment 71 71. The glass composition according to any one of embodiments 56 to 70, wherein the glass composition has a density in the range of 2.20 to 2.60.

[0477] Embodiment 72 72. The glass composition according to any one of embodiments 56 to 71, wherein the glass composition has a liquidus viscosity in the range of 5.0 kP to 150.0 kP.

[0478] Embodiment 73 73. The glass composition according to any one of embodiments 56 to 72, wherein the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0479] EMBODIMENT 74 74. The glass composition according to embodiment 73, wherein the glass composition has a softening point in the range of 750.0°C or higher and 925.0°C or lower.

[0480] Embodiment 75 75. The glass composition according to embodiment 74, wherein the glass composition has a softening point in the range of 790.0°C or more and 910.0°C or less.

[0481] Embodiment 76 73. The glass composition of any one of claims 56 to 72, wherein the glass composition has a softening point of 900.0°C or less.

[0482] Embodiment 77 77. The glass composition of claim 76, wherein the glass composition has a softening point of 875.0°C or less.

[0483] Embodiment 78 78. The glass composition of claim 77, wherein the glass composition has a softening point of 860.0°C or less.

[0484] Embodiment 79 The glass-based article has a K of 0.70 or more as measured by a chevron notched short bar method. 1C 79. A glass-based article comprising the glass composition of any of embodiments 56 to 78, having fracture toughness.

[0485] Embodiment 80 The glass-based article has a K of 0.73 or more as measured by a chevron notched short bar method. 1C 80. The glass-based article of embodiment 79, having fracture toughness.

[0486] Embodiment 81 79. A glass-based article having the composition of any of claims 56 to 78, wherein the glass-based article is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0487] Embodiment 82 82. The glass-based article of embodiment 81, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO at a temperature of 350.0°C to 500.0°C for a period of 2 hours to 12 hours.

[0488] Embodiment 83 83. The glass-based article of embodiment 82, wherein the ion exchange bath further comprises NaNO.

[0489] Embodiment 84 84. The glass-based article of any one of claims 81 to 83, wherein the strengthened glass-based article has a compressive stress of 600.0 MPa or greater.

[0490] Embodiment 85 85. The glass-based article of any of claims 81 to 84, wherein the tempered glass-based article has a maximum central tension of 20.0 MPa or greater.

[0491] Embodiment 86 86. The glass-based article of claim 85, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0492] Embodiment 87 87. The glass-based article of any of claims 81 to 86, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article.

[0493] Embodiment 88 The reinforced glass-based article 88. The glass-based article of embodiment 87, having a compression depth of 0.18t or greater.

[0494] Embodiment 89 89. The glass-based article of any of claims 81 to 88, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0495] Embodiment 90 90. The glass-based article of claim 89, wherein the strengthened glass-based article has a depth of layer of 10.0 μm or greater.

[0496] Embodiment 91 84. The glass-based article of any of claims 81 to 83, wherein the tempered glass-based article has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article, and a depth of layer of 5.0 μm or greater.

[0497] Embodiment 92 92. The glass-based article of claim 91, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0498] Embodiment 93 93. The glass-based article of any one of embodiments 81 to 92, wherein the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0499] Embodiment 94 93. The glass-based article of any of claims 81 to 92, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0500] Embodiment 95 95. The glass-based article of any of claims 81 to 94, wherein the strengthened glass-based article has a break height of 100.0 cm or greater, measured according to a drop test method on 180 grit sandpaper for an article having a thickness of 0.5 mm.

[0501] Embodiment 96 96. The glass-based article of claim 95, wherein the strengthened glass-based article has a break height of 120.0 cm or greater.

[0502] Embodiment 97 97. The glass-based article of claim 96, wherein the strengthened glass-based article has a break height of 150.0 cm or greater.

[0503] Embodiment 98 95. The glass-based article of any of claims 81 to 94, wherein the strengthened glass-based article has a break height of 150.0 cm or greater, as measured according to the drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0504] Embodiment 99 99. The glass-based article of claim 98, wherein the strengthened glass-based article has a breakage height of 180.0 cm or greater.

[0505] Embodiment 100 100. The glass-based article of claim 99, wherein the strengthened glass-based article has a break height of 200.0 cm or greater.

[0506] Embodiment 101 101. The glass-based article of any of claims 81 to 100, wherein the tempered glass-based article has a retained strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0507] Embodiment 102 102. The glass-based article of claim 101, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0508] Embodiment 103 103. The glass-based article of claim 102, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0509] Embodiment 104 101. The glass-based article of any of claims 81 to 100, wherein the tempered glass-based article has a retained strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0510] Embodiment 105 105. The glass-based article of claim 104, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0511] Embodiment 106 106. The glass-based article of claim 105, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0512] Embodiment 107 101. The glass-based article of any of claims 81 to 100, wherein the tempered glass-based article has a retained strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0513] Embodiment 108 108. The glass-based article of claim 107, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0514] Embodiment 109 109. The glass-based article of claim 108, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0515] Embodiment 110 1. A consumer electronic device comprising: a housing having a front, a back, and sides; an electrical component disposed at least partially within the housing, the electrical component including at least a controller, a memory, and a display, the display being disposed on or adjacent to the front surface of the housing; Including, The glass composition or glass-based article of any one of embodiments 56 to 109 is disposed over the display, forms at least a part of the housing, or is disposed over the display and forms at least a part of the housing. Consumer electronic devices.

[0516] Embodiment 111 1. A glass composition comprising: 55.0 mol% or more and 63.0 mol% or less of SiO2; 15.0 mol% or more and 19.0 mol% or less Al2O3; 0.5 mol% or more and 2.5 mol% or less P2O3; 2.0 mol% or more and 6.0 mol% or less B2O3; 6.0 mol% or more and 10.0 mol% or less of Li2O; 6.0 mol% or more and 10.0 mol% or less NaO; and 0.0 mol% or more and 0.5 mol% or less of K2O where: R2O is in the range of 15.0 mol % or more and 20.0 mol % or less (R2O is the total alkali metal oxides in the glass composition); Al2O3 + R2O is in the range of 30.0 mol% or more and 38.0 mol% or less; and -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R0 is the total alkaline earth metal oxides in the glass composition; Glass composition.

[0517] Embodiment 112 112. The glass composition according to embodiment 111, wherein R2O is in the range of 15.0 mol % to 17.0 mol %.

[0518] Embodiment 113 The glass composition according to embodiment 111 or 112, wherein Al2O3+R2O is in the range of 32.0 mol % or more and 36.0 mol % or less.

[0519] Embodiment 114 114. The glass composition of any of embodiments 111 to 113, wherein 0.0≦(Al2O3−(R2O+RO)) / Li2O≦0.1.

[0520] Embodiment 115 115. The glass composition according to any of embodiments 111 to 114, wherein 0.9≦Al2O3 / (R2O+RO)≦1.1.

[0521] Embodiment 116 116. The glass composition of any of embodiments 111 to 115, wherein Al2O3 + R2O + B2O3 is 32.0 mol% or greater.

[0522] Embodiment 117 117. The glass composition of any of embodiments 111 to 116, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.20.

[0523] Embodiment 118 118. The glass composition of embodiment 117, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.30.

[0524] Embodiment 119 119. The glass composition of embodiment 118, wherein (B2O3+P2O5+Al2O3) / (SiO2)≧0.40.

[0525] Embodiment 120 120. The glass composition of any of embodiments 111 to 119, further comprising up to 2.0 mol% MgO.

[0526] Embodiment 121 121. The glass composition of any one of embodiments 111 to 120, further comprising 0.0 mol % to 1.0 mol % TiO2.

[0527] Embodiment 122 122. The glass composition of any of embodiments 111 to 121, further comprising 0.0 mol % to 1.0 mol % SnO2.

[0528] Embodiment 123 123. The glass composition of any of claims 111 to 122, wherein Al2O3*(10.832)+B2O3*(10.334)+PO5*(-13.761)+Li2O*(-3.135)+Na2O*(-7.213)+KO*(-13.761)+MgO*(2.159)+CaO*(-4.518)+SrO*(-4.518)>100.

[0529] Embodiment 124 123. The glass composition of any of claims 111 to 122, wherein Al2O3*(5.99)+B2O3*(-3.85)+PO5*(-8.44)+Li2O*(8.65)+Na2O*(-4.65)+KO*(-10.18)+MgO*(1.86)+CaO*(1.86)+SrO*(1.86)>100.

[0530] Embodiment 125 123. The glass composition of any of claims 111 to 122, wherein Al2O3*(4.52)+B2O*(-8.28)+P2O5*(-1.73)+Li2O*(-10.40)+Na2O*(-7.65)+KO*(-10.52)+MgO*(-4.33)+CaO*(-6.61)+SrO*(-2.60)<-100.

[0531] Embodiment 126 126. The glass composition of any one of embodiments 111 to 125, wherein the glass composition has a density in the range of 2.20 to 2.60.

[0532] Embodiment 127 127. The glass composition of any one of embodiments 111 to 126, wherein the glass composition has a liquidus viscosity in the range of 5.0 kP to 175.0 kP.

[0533] Embodiment 128 128. The glass composition according to any one of embodiments 111 to 127, wherein the glass composition has a softening point in the range of 650.0°C or higher and 950.0°C or lower.

[0534] Embodiment 129 129. The glass composition according to embodiment 128, wherein the glass composition has a softening point in the range of 750.0°C or more and 925.0°C or less.

[0535] Embodiment 130 130. The glass composition according to embodiment 129, wherein the glass composition has a softening point in the range of 790.0°C or more and 910.0°C or less.

[0536] Embodiment 131 128. The glass composition of any one of claims 111 to 127, wherein the glass composition has a softening point of 900.0°C or less.

[0537] Embodiment 132 132. The glass composition of claim 131, wherein the glass composition has a softening point of 875.0°C or less.

[0538] Embodiment 133 133. The glass composition of claim 132, wherein the glass composition has a softening point of 860.0°C or less.

[0539] Embodiment 134 The glass-based article has a resistance of 0.70 MPa.m as measured by the chevron notched short bar method. 1 / 2 More than K 1C 134. A glass-based article having the glass composition of any of embodiments 111 to 133, having fracture toughness.

[0540] Embodiment 135 The glass-based article has a modulus of 0.73 MPa.m as measured by the chevron notched short bar method. 1 / 2 More than K 1C 135. The glass-based article of embodiment 134, having fracture toughness.

[0541] Embodiment 136 134. A glass-based article having the composition of any of claims 111 to 133, wherein the glass-based article is chemically strengthened and has a compressive stress of 450.0 MPa or greater.

[0542] Embodiment 137 137. The glass-based article of claim 136, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C to 500.0°C for a period of 2 hours to 12 hours.

[0543] Embodiment 138 138. The glass-based article of claim 137, wherein the ion exchange bath further comprises NaNO.

[0544] Embodiment 139 139. The glass-based article of any one of claims 136 to 138, wherein the strengthened glass-based article has a compressive stress of 600.0 MPa or greater.

[0545] Embodiment 140 140. The glass-based article of any one of claims 136 to 139, wherein the tempered glass-based article has a maximum central tension of 20.0 MPa or greater.

[0546] Embodiment 141 141. The glass-based article of claim 140, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0547] Embodiment 142 142. The glass-based article of any of claims 136-141, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article.

[0548] Embodiment 143 143. The glass-based article of claim 142, wherein the strengthened glass-based article has a compression depth of 0.18t or greater.

[0549] Embodiment 144 144. The glass-based article of any of claims 136 to 143, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0550] Embodiment 145 145. The glass-based article of claim 144, wherein the strengthened glass-based article has a depth of layer of 10.0 μm or greater.

[0551] Embodiment 146 139. The glass-based article of any of claims 136 to 138, wherein the tempered glass has a compressive stress of 600.0 MPa or greater, a maximum central tension of 20.0 MPa or greater, a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article, and a depth of layer of 5.0 μm or greater.

[0552] Embodiment 147 147. The glass-based article of claim 146, wherein the glass being strengthened has a maximum central tension of 60.0 MPa or greater, a compression depth of 0.18t or greater, and a depth of layer of 10.0 μm or greater.

[0553] Embodiment 148 148. The glass-based article of any one of embodiments 136 to 147, wherein the tempered glass-based article has a Knoop scratch threshold in the range of 6.0 N or more and 12.0 N or less.

[0554] Embodiment 149 148. The glass-based article of any one of claims 136 to 147, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0555] Embodiment 150 150. The glass-based article of any of claims 136 to 149, wherein the strengthened glass-based article has a break height of 100.0 cm or greater, measured according to a drop test method on 180 grit sandpaper for an article having a thickness of 0.5 mm.

[0556] Embodiment 151 151. The glass-based article of claim 150, wherein the strengthened glass-based article has a breakage height of 120.0 cm or greater.

[0557] Embodiment 152 152. The glass-based article of claim 151, wherein the strengthened glass-based article has a breakage height of 150.0 cm or greater.

[0558] Embodiment 153 150. The glass-based article of any of claims 136 to 149, wherein the strengthened glass-based article has a break height of 150.0 cm or greater, as measured according to a drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0559] Embodiment 154 154. The glass-based article of claim 153, wherein the strengthened glass-based article has a breakage height of 180.0 cm or greater.

[0560] Embodiment 155 155. The glass-based article of claim 154, wherein the strengthened glass-based article has a break height of 200.0 cm or greater.

[0561] Embodiment 156 156. The glass-based article of any of claims 136 to 155, wherein the tempered glass-based article has a retained strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0562] Embodiment 157 157. The glass-based article of claim 156, wherein the tempered glass-based article has a residual strength of 175.0 MPa or greater.

[0563] Embodiment 158 158. The glass-based article of claim 157, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0564] Embodiment 159 156. The glass-based article of any of claims 136 to 155, wherein the tempered glass-based article has a retained strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0565] Embodiment 160 160. The glass-based article of claim 159, wherein the tempered glass-based article has a residual strength of 200.0 MPa or greater.

[0566] Embodiment 161 161. The glass-based article of claim 160, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0567] Embodiment 162 156. The glass-based article of any of claims 136 to 155, wherein the tempered glass-based article has a retained strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0568] Embodiment 163 163. The glass-based article of claim 162, wherein the strengthened glass-based article has a residual strength of 225.0 MPa or greater.

[0569] Embodiment 164 164. The glass-based article of claim 163, wherein the strengthened glass-based article has a residual strength of 250.0 MPa or greater.

[0570] Embodiment 165 1. A consumer electronic device comprising: a housing having a front, a back, and sides; an electrical component disposed at least partially within the housing, the electrical component including at least a controller, a memory, and a display, the display being disposed on or adjacent to the front surface of the housing; Including, The glass composition or glass-based article of any one of embodiments 111 to 164 is disposed over the display, forms at least a part of the housing, or is disposed over the display and forms at least a part of the housing. Consumer electronic devices.

[0571] Embodiment 166 1. A glass composition comprising: 55.0 mol% or more and 65.0 mol% or less of SiO2; 14.0 mol% or more and 20.0 mol% or less Al2O3; 0.0 mol% or more and 3.0 mol% or less P2O3; 1.0 mol% or more and 7.0 mol% or less B2O3 where: -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R2O is the sum of alkali metal oxides in the glass composition and R0 is the sum of alkaline earth metal oxides in the composition; and The glass composition has a softening point of 900.0°C or less. Glass composition.

[0572] Embodiment 167 167. The glass composition of embodiment 166, wherein the glass composition has a softening point of 875.0°C or less.

[0573] Embodiment 168 168. The glass composition of claim 166 or claim 167, wherein the glass composition has a softening point of 860.0° C. or less.

[0574] Embodiment 169 169. A glass-based article comprising the glass composition of any of claims 166 to 168, wherein the glass-based article is chemically strengthened.

[0575] Embodiment 170 169. The glass-based article of claim 169, wherein the glass-based article is chemically strengthened in an ion exchange bath containing KNO3 at a temperature of 350.0°C to 500.0°C for a period of 2 hours to 12 hours.

[0576] Embodiment 171 171. The glass-based article of claim 170, wherein the ion exchange bath further comprises NaNO.

[0577] Embodiment 172 172. The glass-based article of any of claims 169 to 171, wherein the strengthened glass-based article has a break height of 100.0 cm or greater, measured according to a drop test method on 180 grit sandpaper for an article having a thickness of 0.5 mm.

[0578] Embodiment 173 173. The glass-based article of claim 172, wherein the strengthened glass-based article has a breakage height of 120.0 cm or greater.

[0579] Embodiment 174 174. The glass-based article of claim 173, wherein the strengthened glass-based article has a breakage height of 150.0 cm or greater.

[0580] Embodiment 175 172. The glass-based article of any of claims 169 to 171, wherein the strengthened glass-based article has a breakage height of 150.0 cm or greater, measured according to a drop test method on 180 grit sandpaper for an article having a thickness of 0.6 mm.

[0581] Embodiment 176 176. The glass-based article of claim 175, wherein the tempered glass-based article has a break height of 180.0 cm or greater.

[0582] Embodiment 177 177. The glass-based article of claim 176, wherein the strengthened glass-based article has a breakage height of 200.0 cm or greater.

[0583] Embodiment 178 178. The glass-based article of any one of claims 169 to 177, wherein the strengthened glass-based article has a compressive stress of 450.0 MPa or greater.

[0584] Embodiment 179 179. The glass-based article of any one of claims 169 to 178, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0585] Embodiment 180 180. The glass-based article of any of claims 169 to 179, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass-based article.

[0586] Embodiment 181 181. The glass-based article of any one of claims 169 to 180, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0587] Embodiment 182 182. The glass-based article of any one of claims 169 to 181, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0588] Embodiment 183 183. The glass-based article of any of claims 169 to 182, wherein the tempered glass-based article has a retained strength of 150.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 80 grit sandpaper at a force of 500.0 N.

[0589] Embodiment 184 184. The glass-based article of claim 183, wherein the strengthened glass-based article has a residual strength of 175.0 MPa or greater.

[0590] Embodiment 185 185. The glass-based article of claim 184, wherein the strengthened glass-based article has a residual strength of 200.0 MPa or greater.

[0591] Embodiment 186 183. The glass-based article of any of claims 169 to 182, wherein the tempered glass-based article has a retained strength of 175.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0592] Embodiment 187 187. The glass-based article of claim 186, wherein the strengthened glass-based article has a residual strength of 200.0 MPa or greater.

[0593] Embodiment 188 188. The glass-based article of claim 187, wherein the strengthened glass-based article has a residual strength of 225.0 MPa or greater.

[0594] Embodiment 189 183. The glass-based article of any of claims 169 to 182, wherein the tempered glass-based article has a retained strength of 200.0 MPa or greater, measured on an article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0595] Embodiment 190 190. The glass-based article of claim 189, wherein the tempered glass-based article has a residual strength of 225.0 MPa or greater.

[0596] Embodiment 191 191. The glass-based article of claim 190, wherein the tempered glass-based article has a residual strength of 250.0 MPa or greater.

[0597] Embodiment 192 1. A glass-based article that is chemically strengthened, comprising: 55.0 mol% or more and 65.0 mol% or less of SiO2; 14.0 mol% or more and 20.0 mol% or less Al2O3; 0.0 mol% or more and 3.0 mol% or less P2O3; 1.0 mol% or more and 7.0 mol% or less B2O3 where: -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R2O is the total alkali metal oxides in the glass-based article and R0 is the total alkaline earth metal oxides in the glass-based article; and the tempered glass-based article has a break height of 100.0 cm or greater, as measured according to a drop test method on 180-grit sandpaper for an article having a thickness of less than 0.5 mm; Glass-based items.

[0598] Embodiment 193 193. The glass-based article of claim 192, wherein the glass-based article has a breakage height of 120.0 cm or greater.

[0599] Embodiment 194 194. The glass-based article of claim 193, wherein the strengthened glass-based article has a breakage height of 150.0 cm or greater.

[0600] Embodiment 195 195. The glass-based article of any one of claims 192 to 194, wherein the strengthened glass-based article has a compressive stress of 450.0 MPa or greater.

[0601] Embodiment 196 196. The glass-based article of any one of claims 192 to 195, wherein the strengthened glass-based article has a maximum central tension of 60.0 MPa or greater.

[0602] Embodiment 197 197. The glass-based article of any of claims 192 to 196, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass article.

[0603] Embodiment 198 198. The glass-based article of any one of claims 192 to 197, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0604] Embodiment 199 199. The glass-based article of any of claims 192 to 198, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0605] Embodiment 200 1. A glass-based article that is chemically strengthened, comprising: 55.0 mol% or more and 65.0 mol% or less of SiO2; 14.0 mol% or more and 20.0 mol% or less Al2O3; 0.0 mol% or more and 3.0 mol% or less P2O3; 1.0 mol% or more and 7.0 mol% or less B2O3 where: -0.1≦(Al2O3−(R2O+R0)) / Li2O≦0.3, where R2O is the total alkali metal oxides in the glass-based article and R0 is the total alkali metal oxides in the glass-based article; and the chemically strengthened glass-based article has a break height of 150.0 cm or greater, as measured according to a drop test method on 180-grit sandpaper for an article having a thickness of less than 0.6 mm; Glass-based items.

[0606] Embodiment 201 201. The glass-based article of claim 200, wherein the chemically strengthened glass-based article has a break height of 180.0 cm or greater.

[0607] Embodiment 202 202. The glass-based article of claim 201, wherein the chemically strengthened glass-based article has a break height of 200.0 cm or greater.

[0608] Embodiment 203 203. The glass-based article of any one of claims 200 to 202, wherein the strengthened glass-based article has a compressive stress of 450.0 MPa or greater.

[0609] Embodiment 204 204. The glass-based article of any one of claims 200 to 203, wherein the tempered glass-based article has a maximum central tension of 60.0 MPa or greater.

[0610] Embodiment 205 205. The glass-based article of any one of claims 200 to 204, wherein the tempered glass-based article has a compression depth of 0.15t or greater, where t is the thickness of the tempered glass article.

[0611] Embodiment 206 206. The glass-based article of any one of claims 200 to 205, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0612] Embodiment 207 207. The glass-based article of any one of embodiments 200 to 206, wherein the tempered glass-based article has a Knoop scratch threshold of 9.0 N or greater.

[0613] Embodiment 208 In glass-based articles, a composition comprising a lithium-based aluminosilicate; first and second opposing surfaces defining a thickness (t) of the glass-based article, wherein the thickness of the glass-based article is greater than or equal to 100 μm and less than or equal to 1000 μm; A break height of 100 cm or greater as measured according to the drop test method on 180-grit sandpaper; and Knoop scratch threshold between 6.0N and 12.0N Glass-based articles, including

[0614] Embodiment 209 209. The glass-based article of claim 208, wherein the glass-based article has a thickness of 400 μm or more and 800 μm or less.

[0615] Embodiment 210 209. The glass-based article of claim 208 or claim 209, wherein the glass-based article has a thickness of 400 μm or more and 700 μm or less.

[0616] Embodiment 211 211. The glass-based article of any of claims 208 to 210, wherein the breakage height is 150 cm or greater as measured according to the drop test method on 180 grit sandpaper.

[0617] Embodiment 212 212. The glass-based article of any of claims 208 to 211, wherein the breakage height is 180 cm or greater as measured according to the drop test method on 180 grit sandpaper.

[0618] Embodiment 213 213. The glass-based article of any of claims 208 to 212, wherein the glass-based article has a Knoop scratch threshold of 6.0 N or greater and 12.0 N or less.

[0619] Embodiment 214 214. The glass-based article of any of claims 208 to 213, wherein the glass-based article has a Knoop scratch threshold of 7.0 N or greater and 12.0 N or less.

[0620] Embodiment 215 215. The glass-based article of any of claims 208 to 214, wherein the glass-based article has a softening point of 650°C or greater and 950°C or less.

[0621] Embodiment 216 216. The glass-based article of any of claims 208 to 215, wherein the glass-based article has a softening point of 650°C or greater and 800°C or less.

[0622] Embodiment 217 The glass-based article has a K of 0.70 or more as measured by a chevron notched short bar method. 1C 217. The glass-based article of any of embodiments 208 to 216, having fracture toughness.

[0623] Embodiment 218 The glass-based article is 50.0 mol% or more and 70.0 mol% or less of SiO2; 10.0 mol% or more and 25.0 mol% or less Al2O3; 0.0 mol% or more and 5.0 mol% or less P2O3; 0.0 mol% or more and 10.0 mol% or less B2O3; 5.0 mol% or more and 15.0 mol% or less of Li2O; 1.0 mol% or more and 15.0 mol% or less NaO; and 0.0 mol% or more and 1.0 mol% or less of K2O 1. A glass-based article having a composition comprising:

[0624] Embodiment 219 R2O is 11.0 mol% or more and 23.0 mol% or less (R2O is the sum of alkali metal oxides present in the glass-based article in mol%); Al2O3 + R2O is 26.0 mol% or more and 40.0 mol% or less; and -0.1≦(Al2O3−(RO+RO)) / Li2O≦0.3, where RO is the sum of alkali metal oxides in mole percent present in the glass-based article; 219. The glass-based article of embodiment 218.

[0625] Embodiment 220 220. The glass-based article of claim 219, wherein R2O is greater than or equal to 15.0 mol% and less than or equal to 19.0 mol%.

[0626] Embodiment 221 221. The glass-based article of embodiment 219 or embodiment 220, wherein Al2O3 + R2O is greater than or equal to 28.0 mol% and less than or equal to 36.0 mol%.

[0627] Embodiment 222 222. The glass-based article of any of claims 219 to 221, wherein 0.0 < (Al2O3 - (R2O + RO)) / Li2O < 0.1.

[0628] Embodiment 223 223. The glass-based article of any of claims 208 to 222, wherein the glass-based article is a tempered glass-based article and has a compression depth of 0.15t or greater.

[0629] Embodiment 224 224. The glass-based article of claim 223, wherein the strengthened glass-based article has a compressive stress of 600 MPa or greater.

[0630] Embodiment 225 225. The glass-based article of claim 223 or claim 224, wherein the tempered glass-based article has a maximum central tension of 20.0 MPa or greater.

[0631] Embodiment 226 226. The glass-based article of any of claims 223 to 225, wherein the strengthened glass-based article has a depth of layer of 5.0 μm or greater.

[0632] Embodiment 227 A glass-based article, a composition comprising a lithium-based aluminosilicate; first and second opposing surfaces defining a thickness (t) of the glass-based article, wherein the thickness of the glass-based article is greater than or equal to 100 μm and less than or equal to 1000 μm; A residual strength of 150 MPa or greater, as measured on a glass-based article having a thickness of 600.0 μm after impact with 80-grit sandpaper at a force of 500.0 N; and Knoop scratch threshold between 6.0N and 12.0N Glass-based articles, including

[0633] Embodiment 228 228. The glass-based article of claim 227, wherein the glass-based article has a residual strength of 175 MPa or greater, measured on a glass-based article having a thickness of 600.0 μm after impact with 120 grit sandpaper at a force of 500.0 N.

[0634] Embodiment 229 229. The glass-based article of claim 227 or claim 228, wherein the glass-based article has a residual strength of 200 MPa or greater, measured on a glass-based article having a thickness of 600.0 μm after impact with 180 grit sandpaper at a force of 500.0 N.

[0635] Embodiment 230 1. A consumer electronic device comprising: a housing having a front, a back, and sides; an electrical component disposed at least partially within the housing, the electrical component including at least a controller, a memory, and a display, the display being disposed on or adjacent to the front surface of the housing; Including, The glass-based article of any of embodiments 208 to 229 is disposed over the display, forms at least a part of the housing, or is disposed over the display and forms at least a part of the housing. Consumer electronic devices.

[0636] Embodiment 231 229. The glass-based article of any one of claims 208 to 229, wherein the glass-based article is a mobile phone cover glass. [Explanation of symbols]

[0637] 10 Device Dropper 12 Zipper 14 Chuck jaws 16 pack 18 Falling surface 100 glass 110 First Surface 112 Second Surface 120 First compression layer / first segment 122 Second Compression Layer / Second Segment 130 Central area 200 Consumer Electronics 202 Case 204 Front 206 Back 208 Side 210 Display 212 Cover board 1100 Apparatus for impact testing of glass articles 1102 Pendulum 1104 Perpendicular ball 1106 Pivot 1108 Arm 1110 Base 1140 striking object

Claims

1. A glass-based article, a composition comprising a lithium-based aluminosilicate; first and second opposing surfaces defining a thickness (t) of the glass-based article, wherein the thickness of the glass-based article is greater than or equal to 100 μm and less than or equal to 1000 μm; A break height of 100 cm or greater as measured according to the drop test method on 180 grit sandpaper; and Knoop scratch threshold of 6.0N or more and 12.0N or less Including, The composition further comprises: SiO 2 of 55.0 mol % or more and 65.0 mol % or less; 14.0 mol% or more and 20.0 mol% or less of Al 2 O 3 ; 0.0 mol% or more and 3.0 mol% or less of P 2 O 5 ; 1.0 mol% or more and 7.0 mol% or less of B 2 O 3 ; 5.0 mol% or more and 10.0 mol% or less of Li 2 O; 5.0 mol% or more and 10.0 mol% or less Na 2 O; 0.0 mol% or more and 1.0 mol% or less of K 2 O; and 1.0 mol% or more and 2.0 mol% or less of MgO; Including, R2O is 13.0 mol% or more and 20.0 mol% or less (R2O is the sum of alkali metal oxides present in the glass-based article in mol%); Al 2 O 3 +R 2 O is 28.0 mol % or more and 40.0 mol % or less; and -0.1≦(Al 2 O 3 −(R 2 O+RO)) / Li 2 O≦0.3, where RO is the sum of divalent cation oxides in mole percent present in the glass-based article, including MgO, CaO, SrO, BaO, FeO, and ZnO; and Al 2 O 3 / (R 2 O+RO)≦1; The glass-based article has a softening point of 650°C or higher and 850°C or lower. Glass-based items.

2. 2. The glass-based article of claim 1, wherein the glass-based article has a thickness of 400 μm or more and 800 μm or less.

3. the failure height is 150 cm or greater as measured according to the drop test method on 180 grit sandpaper; and The glass-based article has a Knoop scratch threshold of 6.0 N or more and 12.0 N or less; The glass-based article according to claim 1 or claim 2.

4. The glass-based article has a K of 0.70 or more as measured by a chevron notched short bar method. １Ｃ 4. The glass-based article of claim 1, having fracture toughness.

5. 5. The glass-based article of any one of claims 1 to 4, wherein the glass-based article is a tempered glass-based article and has a compression depth of 0.15t or greater.

6. 6. The glass-based article of claim 5, wherein the strengthened glass-based article has a maximum central tension of 20.0 MPa or greater.

7. 7. The glass-based article of claim 5 or claim 6, wherein the tempered glass-based article has a depth of layer of 5.0 μm or more.

8. The composition comprising: SiO 2 up to 60.0 mol %; up to 18.0 mol% Al 2 O 3 ; 1.0 mol% or less P2O5; 5.0 mol% or less of B2O3; 9.0 mol% or less Li2O; 9.0 mol% or less of Na2O; and 0.1 mol % or less of K 2 O, 8. The glass-based article of any one of claims 1 to 7, comprising:

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