# US 11,993,062 B2 · Composite glass pane > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,993,062 B2 - Document ID: US11993062B2 - Status: Granted - Kind: B2 - Application number: 16/450,419 - Filed: 2019-06-24 - Published: 2019-10-10 - Granted: 2024-05-28 - Earliest claimed: 2016-12-22 - Assignees: Schott AG - Applicants: Schott AG - Inventors: Jochen Alkemper; Lutz Klippe; Rüdiger Dietrich - Web page: https://patentgrep.com/patent/US11993062B2 ## CPC - B32B 3/263: {characterised by a layer having non-uniform thickness} - B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)} - B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer} - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - B32B 17/10036: {comprising two outer glass sheets} - B32B 17/10045: {with at least one intermediate layer consisting of a glass sheet} - B32B 17/10119: {having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate} - B32B 17/10137: {Chemical strengthening} - C03B 17/064: {by the overflow downdraw fusion process; Isopipes therefor} - C03B 18/02: Forming sheets - C03B 23/023: by bending - C03C 3/083: containing aluminium oxide or an iron compound - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 3/093: containing zinc or zirconium - C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)} - B32B 2315/08: Glass - B32B 2329/04: Polyvinylalcohol - B32B 2329/06: PVB, i.e. polyinylbutyral - B32B 2551/00: Optical elements - B32B 2571/00: Protective equipment - B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings - Y10T 428/24777: Edge feature - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A laminated glass pane is provided that includes a first glass sheet, a polymeric layer having a thickness between at least 0.5 mm and at most 1.7 mm, and a second inner glass sheet which has a thickness of at least 0.3 mm and at most 1.5 mm and is made of a lithium aluminum silicate glass. The polymeric layer is disposed between the at least two glass sheets. Furthermore, the glasses of the first and the second glass sheets are matched so that the temperatures at which the two glasses of the first and second glass sheets have the same viscosity in the viscosity range between 107 dPa·s and 1010 dPa·s differ from each other only by a maximum of 50° C. ## Claims ### Claim 1 A laminated glass pane, comprising: a first glass sheet having a first composition; a second glass sheet having a thickness between at least 0.3 mm and at most 1.5 mm, the second glass sheet being made of a lithium aluminum silicate glass and having a second composition that differs from the first composition; and a polymeric layer having a thickness between at least 0.5 mm and at most 1.7 mm, the polymeric layer positioned between and bonding the first and second glass sheets to one another, wherein the first and second compositions are, in a viscosity range between 107 dPa·s and 1010 dPa·s, matched so that temperatures at which the first and second glass sheets have a same viscosity only differ from each other by not more than 50° C.; and wherein the second glass sheet comprises a lithium aluminum silicate glass having: a Li2O content from 4.6 wt % to 5.4 wt %; a Na2O content from 8.1 wt % to 9.7 wt %; a Al2O3 content from 16 wt % to 20 wt %; and a B2O3 content from 0 wt % to 0.9 wt %. ### Claim 2 (depends on 1) The laminated glass pane of claim 1, wherein the temperatures differ by not more than 10° C. ### Claim 3 (depends on 1) The laminated glass pane of claim 1, wherein the lithium aluminum silicate glass exhibits a Young's modulus of at least 80 GPa. ### Claim 4 (depends on 3) The laminated glass pane of claim 3, wherein the Young's modulus is at least 84 GPa. ### Claim 5 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet is a chemically toughened glass sheet having a compressive stress zone with a depth of at least 40 μm and a compressive stress of at least 150 MPa and at most 900 MPa. ### Claim 6 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet is a chemically toughened glass sheet having a compressive stress zone with a depth of at least 40 μm and a compressive stress of at least 150 MPa and at most 600 MPa. ### Claim 7 (depends on 5) The laminated glass pane of claim 5, wherein the depth is at least 80 μm. ### Claim 8 (depends on 5) The laminated glass pane of claim 5, wherein the second glass sheet comprises surfaces that are enriched in sodium and depleted of lithium in a region of the compressive stress zone compared to a bulk of the second glass sheet. ### Claim 9 (depends on 1) The laminated glass pane of claim 1, further comprising a curvature such that an outwardly facing side of the second glass sheet is curved concavely. ### Claim 10 (depends on 1) The laminated glass pane of claim 1, further comprising a uniaxial curve or a biaxial curve. ### Claim 11 (depends on 10) The laminated glass pane of claim 10, wherein one or more of the first glass sheet, the second glass sheet, and the polymeric layer have a thickness that decreases from a center of curvature towards edges of the laminated glass pane. ### Claim 12 (depends on 10) The laminated glass pane of claim 10, wherein one or more of the first glass sheet, the second glass sheet, and the polymeric layer have a thickness that remains consistent from a center of curvature towards edges of the laminated glass pane. ### Claim 13 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet is a float glass sheet. ### Claim 14 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet has a zebra angle of greater than or equal to 45° at a thickness of 0.7 mm. ### Claim 15 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet has a zebra angle of greater than or equal to 55° at a thickness of 0.7 mm. ### Claim 16 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet exhibits a ring-on-ring bending strength of more than 150 MPa and of less than 900 MPa. ### Claim 17 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet exhibits a ring-on-ring bending strength of more than 600 MPa and of less than 900 MPa. ### Claim 18 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet comprises a combined toughened zone comprising: a potassium-exchanged surface layer with a thickness of less than 20 μm as determined from a surface of the second glass sheet and a maximum compressive stress at the surface of more than 500 MPa; and a sodium-exchanged surface layer with a thickness of more than 40 μm as determined from the surface, wherein the sodium-exchanged surface layer has a maximum local stress in an interior of a purely sodium-exchanged region that is less than 500 MPa. ### Claim 19 (depends on 1) The laminated glass pane of claim 1, wherein the first glass sheet comprises a soda-lime glass with a thickness between 1.5 mm and 2.5 mm or a lithium aluminum silicate glass with a thickness between at least 0.3 mm and at most 1.5 mm. ### Claim 20 (depends on 1) The laminated glass pane of claim 1, wherein the second glass sheet is a substantially chemically toughened glass sheet due to an exchange of lithium ions by sodium ions. ### Claim 21 A laminated glass pane, comprising: a first glass sheet being made of soda-lime glass; a second glass sheet having a thickness between at least 0.3 mm and at most 1.5 mm, the second glass sheet being made of a lithium aluminum silicate glass; and a polymeric layer having a thickness between at least 0.5 mm and at most 1.7 mm, the polymeric layer positioned between and bonding the first and second glass sheets to one another, wherein the first and second glass sheets comprise glass compositions that, in a viscosity range between 107 dPa·s and 1010 dPa·s, are matched so that temperatures at which the first and second glass sheets have a same viscosity only differ from each other by not more than 50° C.