COMPOSITE GLASS PANE

• US 20190308394A1
• Filed: 06/24/2019
• Published: 10/10/2019
• Est. Priority Date: 12/22/2016
• Status: Active Grant

• Current Assignee: Schott AG (Carl-Zeiss-Stiftung)
• Original Assignee: Schott AG (Carl-Zeiss-Stiftung)
• Inventors: ALKEMPER, Jochen, KLIPPE, Lutz, DIETRICH, Rudiger
• Granted Patent: US 11,993,062 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10045 with at least one intermediate layer consisting of a glass sheet
• CPC Class Codes: B32B 17/10119 having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate
• CPC Class Codes: B32B 17/10137 Chemical strengthening
• CPC Class Codes: B32B 2315/08 Glass
• CPC Class Codes: B32B 2329/04 Polyvinylalcohol
• CPC Class Codes: B32B 2329/06 PVB, i.e. polyinylbutyral
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 2571/00 Protective equipment
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 3/02 characterised by features of form at particular places, e.g. in edge regions non-uniform thickness B32B3/263
• CPC Class Codes: 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
• CPC Class Codes: B32B 3/263 characterised by a layer having non-uniform thickness
• CPC Class Codes: 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
• CPC Class Codes: C03B 17/064 by the overflow downdraw fusion process; Isopipes therefor
• CPC Class Codes: C03B 18/02 Forming sheets
• CPC Class Codes: C03B 23/023 by bending
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 3/083 containing aluminium oxide or an iron compound
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 3/093 : containing zinc or zirconium
• CPC Class Codes: Y10T 428/24777 : Edge feature

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

1. A laminated glass pane, comprising:

a first glass sheet;

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 between and bonding the first and second glass sheets to one another,

wherein the first and second glass sheets comprise glasses 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.

2. The laminated glass pane of claim 1, wherein the temperatures differ by not more than 10°

C.

3. The laminated glass pane of claim 1, wherein the lithium aluminum silicate glass exhibits a Young'"'"'s modulus of at least 80 GPa.

4. The laminated glass pane of claim 3, wherein the Young'"'"'s modulus is at least 84 GPa.

5. 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 μ

m and a compressive stress of at least 150 MPa and at most 900 MPa.

6. The laminated glass pane of claim 5, wherein the compressive stress is at most 600 MPa.

7. The laminated glass pane of claim 5, wherein the depth is at least 80 μ

rn.

8. 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 the bulk of the second glass sheet.

9. 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.

10. The laminated glass pane of claim 1, further comprising a uniaxial curve or a biaxially curve.

11. 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.

12. 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 the center of curvature towards edges of the laminated glass pane.

13. The laminated glass pane of claim 1, wherein the second glass sheet is a float glass sheet.

14. 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.

15. The laminated glass pane of claim 14, wherein the zebra angle is greater than or equal to 55°

.

16. 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.

17. The laminated glass pane of claim 16, wherein the ring-on-ring bending strength is more than 600 MPa.

18. 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 μ

m 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 μ

m 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.

19. 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.

20. The laminated glass pane of claim 1, wherein the first glass sheet and/or the second glass sheet comprises a lithium aluminum silicate glass having:

an Li₂O content from 4.6 wt % to 5.4 wt %;

an Na₂O content from 8.1 wt % to 9.7 wt %; and

an Al₂O₃ content from 16 wt % to 20 wt %.

21. The laminated glass pane of claim 1, wherein the second glass sheet is a chemically toughened glass sheet substantially due to an exchange of lithium ions by sodium ions.

22. A method for producing a laminated glass pane, comprising:

providing a first glass sheet;

providing a second glass sheet having a thickness between at least 0.3 mm and at most 1.5 mm and made of a lithium aluminum silicate glass; and

bonding the first and second glass sheets to one another with a polymeric layer having a thickness between at least 0.5 mm and at most 1.7 mm to form the laminated glass pane,

wherein the steps of providing the first and second glass sheets comprise providing glasses 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.

23. The method of claim 22, further comprising curving the laminated glass pane.

24. The method of claim 23, wherein the curving step comprises curving the first and second glass sheets in a common process step or in successive process steps with common process parameters.

25. The method of claim 22, wherein the step of providing the first glass sheet and/or the second glass sheet comprises providing a chemically toughened first and/or second glass sheet, respectively.