# US 10,370,287 B2 · Chemically strengthened glass, and glass for chemical strengthening > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,287 B2 - Document ID: US10370287B2 - Status: Granted - Kind: B2 - Application number: 15/920,009 - Filed: 2018-03-13 - Published: 2018-09-20 - Granted: 2019-08-06 - Earliest claimed: 2016-01-21 - Assignees: AGC Inc. - Applicants: AGC Inc. - Inventors: Suguru Murayama; Seiki Ohara; Qing Li; Shusaku Akiba - Web page: https://patentgrep.com/patent/US10370287B2 ## CPC - C03C 3/085: containing an oxide of a divalent metal - C03C 3/083: containing aluminium oxide or an iron compound - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 3/091: containing aluminium - C03C 3/093: containing zinc or zirconium - C03C 3/097: containing phosphorus, niobium or tantalum - C03C 4/18: for ion-sensitive glass - C03C 21/00: Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface - C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)} - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS ## Abstract A glass for chemical strengthening contains, in mole percentage on an oxide basis, 58 to 72% of SiO2, 7 to 18% of Al2O3, 1% or more of B2O3, 0 to 4% of P2O5, 5 to 16% of Li2O, 0 to 7% of Na2O, 0 to 2% of K2O, 0 to 6% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0 to 2% of ZrO2. A value of X is 30000 or more. The value of X is calculated based on the formula, X=SiO2×329+Al2O3×786+B2O3×627+P2O5×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8, by using the contents in mole percentage on an oxide basis of components. ## Claims ### Claim 1 A glass for chemical strengthening, comprising, in mole percentage on an oxide basis, 58 to 70 of SiO2, 10 to 18% of Al2O3, 0 to 3% of B2O3, 0 to 2% of P2O5, 8 to 13% of Li2O, 2 to 6% of Na2O, 0.5 to 2% of K2O, more than 0% to 5% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0.5 to 2% of ZrO2, wherein a value of X is 30000 or more, the value of X being calculated based on the following formula by using contents in mole percentage on an oxide basis of components of SiO2, Al2O3, B2O3, P2O5, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and ZrO2: X=SiO2×329+Al2O3×786+B2O3×627+P2O5×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8. ### Claim 2 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the value of X is 44000 or more. ### Claim 3 (depends on 1) The glass for chemical strengthening according to claim 1, wherein a value of Y is 0.7 or more, the value of Y being calculated based on the following formula by using contents in mole percentage on an oxide basis of components of SiO2, Al2O3, B2O3, P2O5, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and ZrO2: Y=SiO2×0.00884+Al2O3×0.0120+B2O3×(−0.00373)+P2O5×0.000681+Li2O×0.00735+Na2O×(−0.00234)+K2O×(−0.00608)+MgO×0.0105+CaO×0.00789+SrO×0.00752+BaO×0.00472+ZrO2×0.0202. ### Claim 4 (depends on 1) The glass for chemical strengthening according to claim 1, wherein a value of Z is 20000 or more, the value of Z being calculated based on the following formula by using contents in mole percentage on an oxide basis of components of SiO2, Al2O3, B2O3, P2O5, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and ZrO2: Z=SiO2×237+Al2O3×524+B2O3×228+P2O5×(−756)+Li2O×538+Na2O×44.2+K2O×(−387)+MgO×660+CaO×569+SrO×291+ZrO2×510. ### Claim 5 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of ZrO2 in mole percentage on an oxide basis is from 0.5 to 1.2%. ### Claim 6 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of K2O in mole percentage on an oxide basis is from 1 to 2%. ### Claim 7 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of B2O3 in mole percentage on an oxide basis is from 0 to 1%. ### Claim 8 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of Al2O3 in mole percentage on an oxide basis is from 10 to 11%. ### Claim 9 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of MgO is from 3 to 5%. ### Claim 10 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of CaO is from 0 to 1%. ### Claim 11 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of SrO is from 0 to 1%. ### Claim 12 (depends on 1) The glass for chemical strengthening according to claim 1, wherein the content of BaO is from 0 to 1%. ### Claim 13 (depends on 1) The glass for chemical strengthening according to claim 1, not comprising ZnO. ### Claim 14 (depends on 1) The glass for chemical strengthening according to claim 1, not comprising Ta2O5, Gd2O3, As2O3, and Sb2O3. ### Claim 15 (depends on 1) The glass for chemical strengthening according to claim 1, wherein a devitrification temperature T is equal to or lower than a temperature T4 at which a viscosity reaches 104 dPa·s. ### Claim 16 A chemically strengthened glass, comprising, in mole percentage on an oxide basis, 58 to 70 of SiO2, 10 to 18% of Al2O3, 0 to 3% of B2O3, 0 to 2% of P2O5, 8 to 13% of Li2O, 2 to 6% of Na2O, 0.5 to 2% of K2O, more than 0% to 5% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0.5 to 2% of ZrO2, wherein: the chemically strengthened glass has a specific compressive stress (CS) of 450 MPa or more; the compressive stress value (CS90) in a portion at a depth of 90 μm from a surface of the chemically strengthened glass is 25 MPa or more, or a compressive stress value (CS100) in a portion at a depth of 100 μm from the surface is 15 MPa or more; and a value of X is 30000 or more, the value of X being calculated based on the following formula by using contents in mole percentage on an oxide basis of components of SiO2, Al2O3, B2O3, P2O5, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and ZrO2: X=SiO2×329+Al2O3×786+B2O3×627+P2O5μ×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8. ### Claim 17 (depends on 16) The chemically strengthened class according to claim 16, wherein a depth dh of a portion at which a magnitude of an internal compressive stress reaches ½ of a surface compressive stress (CS) is 8 μm or more.