# US 12,179,459 B2 · Glass articles with residual stress and viscosity properties for sagging processes, and compositions for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,459 B2 - Document ID: US12179459B2 - Status: Granted - Kind: B2 - Application number: 17/292,157 - Filed: 2019-11-01 - Published: 2021-12-16 - Granted: 2024-12-31 - Earliest claimed: 2018-11-09 - Assignees: Corning Incorporated - Applicants: Corning Incorporated - Inventors: Heather Debra Boek; Venkatesh Botu; Timothy Michael Gross; Balamurugan Meenakshi Sundaram; Adama Tandia; Lisa Anne Tietz Moore; Kochuparambil Deenamma Vargheese; Mark Owen Weller - Web page: https://patentgrep.com/patent/US12179459B2 ## CPC - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - B32B 7/022: Mechanical properties - 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 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)} - B32B 2315/08: Glass - B32B 2419/00: Buildings or parts thereof - B32B 2605/08: Cars - C03C 2204/00: Glasses, glazes or enamels with special properties - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - 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 laminate glass article is provided that includes: a core glass layer comprising a first coefficient of thermal expansion (CTE); and a plurality of clad glass layers, each comprising a first primary surface, a second primary surface in contact with the core glass layer and a second CTE that is lower than the first CTE of the core glass layer. The difference in the first and second CTE is about 10×10−7/#C to about 70×10−7/#C. Further, each of the core glass layer and the clad glass layers comprises a viscosity from 109.0 to 1014.0 Poise from about 550 #C to about 700 #C. ## Claims ### Claim 1 A laminate glass article, comprising: a core glass layer comprising a first coefficient of thermal expansion (CTE); and a plurality of clad glass layers, each clad glass layer comprising a first primary surface, a second primary surface in contact with the core glass layer, and a second CTE that is lower than the first CTE, wherein a difference between the first CTE and the second CTE is in a range from about 10×10−7/° C. to about 70×10−7/° C., and each of the core glass layer and the clad glass layers comprises a viscosity of about 109.9 Poise from about 550° C. to about 720° C., wherein each clad glass layer of the plurality of clad glass layers comprises 0.5% to 8% Al2O3 by weight. ### Claim 2 (depends on 1) The laminate glass article according to claim 1, wherein the core glass layer comprises by weight: 57% to 72% SiO2; 9% to 17% Al2O3; 0% to 1.5% B2O3; 10% to 18% Na2O; 1% to 7% K2O; 0% to 4% MgO; 0% to 1.5% CaO; 0% to 4% ZnO; 0.2% to 1% SnO2; and 0% to 4% P2O5. ### Claim 3 (depends on 1) The laminate glass article according to claim 1, wherein each clad glass layer of the plurality of clad glass layers comprises by weight: 61.1% to 74.2% SiO2; 0.8% to 8% Al2O3; 0% to 16.4% B2O3; 2.3% to 7.7% Na2O; 0% to 2% K2O; 0% to 3.9% MgO; 0% to 3.1% CaO; 0% to 9.8% ZnO; and 0% to 0.5% SnO2. ### Claim 4 (depends on 1) The laminate glass article according to claim 1, wherein the core glass layer comprises by weight: 60% to 69% SiO2; 10.9% to 15.8% Al2O3; 0% to 1.1% B2O3; 11.2% to 15.9% Na2O; 1.6% to 5.7% K2O; 0% to 3.1% MgO; 0% to 0.9% CaO; 0% to 2.5% ZnO; 0.2% to 0.5% SnO2; and 0% to 3.2% P2O5. ### Claim 5 (depends on 1) The laminate glass article according to claim 1, wherein each clad glass layer of the plurality of clad glass layers further comprises a plurality of ion-exchangeable ions and an ion-exchanged compressive stress region, and the ion-exchanged compressive stress region is defined from the first primary surface to a first selected depth in each of the plurality of clad glass layers. ### Claim 6 (depends on 1) The laminate glass article according to claim 1, wherein the laminate glass article comprises an edge ion-exchanged compressive stress region, the edge ion-exchanged compressive stress region defined from an edge of the laminate glass article to a second selected depth in the core and clad glass layers. ### Claim 7 (depends on 1) The laminate glass article according to claim 1, wherein the laminate glass article is bonded to a soda-lime glass (SLG) ply, and wherein each of the core glass layer and the clad glass layers comprises a viscosity within +25% of a viscosity of the SLG ply over a range of from about 550° C. to about 720° C. ### Claim 8 (depends on 1) The laminate glass article according to claim 1, wherein each clad glass layer of the plurality of clad glass layers comprises by weight: 58% to 77% SiO2; 0% to 18% B2O3; 2% to 9% Na2O; 0% to 3% K2O; 0% to 5% MgO; 0% to 4% CaO; 0% to 11% ZnO; and 0% to 1% SnO2. ### Claim 9 (depends on 8) The laminate glass article according to claim 8, wherein each second CTE is in a range from about 33×10−7/° C. to about 65×10−7/° C. ### Claim 10 A laminate glass article, comprising: a core glass layer comprising a first coefficient of thermal expansion (CTE); and a plurality of clad glass layers, each clad glass layer comprising a first primary surface, a second primary surface in contact with the core glass layer, and a second CTE that is lower than the first CTE, wherein a difference between the first CTE and the second CTE is in a range from about 10×10−7/° C. to about 70×107/° C., wherein each of the core glass layer and the clad glass layers comprises a viscosity of about 109.9 Poise from about 550° C. to about 720° C., and a total thickness of the plurality of clad glass layers and the core glass layer ranges from about 0.15 mm to about 3 mm, wherein each clad glass layer of the plurality of clad glass layers comprises 0.5% to 8% Al2O3 by weight. ### Claim 11 (depends on 10) The laminate glass article according to claim 10, wherein the core glass layer comprises by weight: 57% to 72% SiO2; 9% to 17% Al2O3; 0% to 1.5% B2O3; 10% to 18% Na2O; 1% to 7% K2O; 0% to 4% MgO; 0% to 1.5% CaO; 0% to 4% ZnO; 0.2% to 1% SnO2; and 0% to 4% P2O5. ### Claim 12 (depends on 10) The laminate glass article according to claim 10, wherein a total thickness of the plurality of clad glass layers and the core glass layer ranges from about 0.2 mm to about 2 mm. ### Claim 13 (depends on 10) The laminate glass article according to claim 10, wherein each of the plurality of clad glass layers further comprises a plurality of ion-exchangeable ions and an ion-exchanged compressive stress region, and the ion-exchanged compressive stress region is defined from the first primary surface to a first selected depth in each of the plurality of clad glass layers. ### Claim 14 (depends on 10) The laminate glass article according to claim 10, wherein the laminate glass article comprises an edge ion-exchanged compressive stress region, the edge ion-exchanged compressive stress region defined from an edge of the laminate glass article to a second selected depth in the core and clad glass layers. ### Claim 15 (depends on 10) The laminate glass article according to claim 10, wherein the laminate glass article is bonded to a soda-lime glass (SLG) ply, and wherein each of the core glass layer and the clad glass layers comprises a viscosity within ±25% of a viscosity of the SLG ply over a range of from about 550° C. to about 720° C. ### Claim 16 (depends on 10) The laminate glass article according to claim 10, wherein each clad glass layer of the plurality of clad glass layers comprises by weight: 58% to 77% SiO2; 0% to 18% B2O3; 2% to 9% Na2O; 0% to 3% K2O; 0% to 5% MgO; 0% to 4% CaO; 0% to 11% ZnO; and 0% to 1% SnO2. ### Claim 17 (depends on 16) The laminate glass article according to claim 16, wherein each second CTE is in a range from about 33×10−7/° C. to about 65×10−7/° C. ### Claim 18 A laminate glass article, comprising: a core glass layer comprising a first coefficient of thermal expansion (CTE); and a plurality of clad glass layers, each clad glass layer comprising a first primary surface, a second primary surface in contact with the core glass layer, and a second CTE that is lower than the first CTE, wherein a difference between the first CTE and the second CTE is in a range from about 10×10−7/° C. to about 70×10−7/° C., wherein each of the core glass layer and the clad glass layers comprises a viscosity of about 109.9 Poise from about 550° C. to about 720° C., and a ratio of a thickness of the core glass layer to a thickness of the plurality of clad glass layers is in a range from about 1 to about 20, wherein each clad glass layer of the plurality of clad glass layers comprises 0.5% to 8% Al2O3 by weight. ### Claim 19 (depends on 18) The laminate glass article according to claim 18, wherein the core glass layer comprises by weight: 57% to 72% SiO2; 9% to 17% Al2O3; 0% to 1.5% B2O3; 10% to 18% Na2O; 1% to 7% K2O; 0% to 4% MgO; 0% to 1.5% CaO; 0% to 4% ZnO; 0.2% to 1% SnO2; and 0% to 4% P2O5. ### Claim 20 (depends on 18) The laminate glass article according to claim 18, wherein a ratio of a thickness of the core glass layer to a thickness of the plurality of clad glass layers is in a range from about 1 to about 10. ### Claim 21 (depends on 18) The laminate glass article according to claim 18, wherein each of the plurality of clad glass layers further comprises a plurality of ion-exchangeable ions and an ion-exchanged compressive stress region, and the ion-exchanged compressive stress region is defined from the first primary surface to a first selected depth in each of the plurality of clad glass layers. ### Claim 22 (depends on 18) The laminate glass article according to claim 18, wherein the laminate glass article comprises an edge ion-exchanged compressive stress region, the edge ion-exchanged compressive stress region defined from an edge of the laminate glass article to a second selected depth in the core and clad glass layers. ### Claim 23 (depends on 18) The laminate glass article according to claim 18, wherein the laminate glass article is bonded to a soda-lime glass (SLG) ply, and wherein each of the core glass layer and the clad glass layers comprises a viscosity within ±25% of a viscosity of the SLG ply over a range of from about 550° C. to about 720° C. ### Claim 24 (depends on 18) The laminate glass article according to claim 18, wherein each clad glass layer of the plurality of clad glass layers comprises by weight: 58% to 77% SiO2; 0% to 18% B2O3; 2% to 9% Na2O; 0% to 3% K2O; 0% to 5% MgO; 0% to 4% CaO; 0% to 11% ZnO; and 0% to 1% SnO2. ### Claim 25 (depends on 24) The laminate glass article according to claim 24, wherein each second CTE is in a range from about 33×10−7/° C. to about 65×10−7/° C.