Shaped glass laminates and methods for forming the same

Patent metadata

Field	Value
Publication number	US-10450215-B2
Application number	US-201816050486-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Feb 20, 2017
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Embodiments of a laminate including a first curved glass substrate comprising a first viscosity (poises) at a temperature of 630° C.; a second curved glass substrate comprising a second viscosity that is greater than the first viscosity at a temperature of 630° C.; and an interlayer disposed between the first curved glass substrate and the second curved glass substrate, are disclosed. In one or more embodiments, the first curved glass substrate exhibits a first sag depth that is within 10% of a second sag depth of the second curved glass substrate. In one or more embodiments, the first glass substrate and the second glass substrate exhibit a shape deviation therebetween of about ±5 mm or less as measured by an optical three-dimensional scanner or exhibit minimal optical distortion. Embodiments of vehicles including such laminates and methods for making such laminates are also disclosed.

First claim

What is claimed is:

1. A laminate comprising:
a first curved glass substrate comprising a first major surface, a second major surface opposing the first major surface, a first thickness defined as the distance between the first major surface and second major surface, and a first sag depth of about 2 mm or greater, the first curved glass substrate comprising a first viscosity (poises) at a temperature of 630° C.;
a second curved glass substrate comprising a third major surface, a fourth major surface opposing the third major surface, a second thickness defined as the distance between the third major surface and the fourth major surface that is less than the first thickness, and a second sag depth of about 2 mm or greater; and
an interlayer disposed between the first curved glass substrate and the second curved glass substrate and adjacent the second major surface and third major surface,
wherein the first sag depth is within 10% of the second sag depth and a shape deviation between the first glass substrate and the second glass substrate of ±5 mm as measured by an optical three-dimensional scanner, and
wherein one of or both the first major surface and the fourth major surface exhibit an optical distortion of less than 200 millidiopters as measured by an optical distortion detector using transmission optics,
wherein the first curved glass substrate comprises a membrane tensile stress of less than 7 MPa according to ASTM C1279, and
wherein a glass stack of the first curved glass substrate and the second curved glass substrate comprises an effective viscosity that is between the first viscosity and a second viscosity of the second curved glass substrate at a temperature (T) in a range from about 500° C. to about 700° C., and is determined by the equation: μ eff (T)=((μ 1 (T)t 1 )/(t 1 +t 2 ))+((μ 2 (T)t 2 )/(t 1 +t 2 ), where μ 1 (T) is the viscosity of the first curved glass substrate at temperature (T), t 1 is the thickness of the first curved glass substrate, μ 2 (T) is the viscosity of the second curved glass substrate at temperature (T), t 2 is the thickness of the second curved glass substrate.

2. The laminate of claim 1 , wherein, the second curved glass substrate comprises a second viscosity that differs from the first viscosity at a temperature of 630° C.

3. The laminate of claim 1 , wherein the first thickness is from about 3 times to about 10 times the second thickness or from 4 times to about 10 times the second thickness.

4. The laminate of claim 3 , wherein the second thickness is less than 1.5 mm or less than 1.4 mm.

5. The laminate of claim 3 , wherein the first thickness is about 1.6 mm or greater, and the second thickness is in a range from about 0.1 mm to less than about 1.6 mm.

6. The laminate of claim 3 , wherein first curved substrate comprises a first sag temperature and the second curved glass substrate comprises a second sag temperature that differs from the first sag temperature.

7. The laminate of claim 3 , wherein the shape deviation is about ±1 mm.

8. The laminate of claim 3 , wherein the optical distortion is 100 millidiopters or less.

9. The laminate of claim 3 , wherein the membrane tensile stress is 5 MPa or less.

10. The laminate of claim 3 , wherein the second sag depth is in a range from about 5 mm to about 30 mm.

11. The laminate of claim 3 , wherein the first major surface or the second major surface comprises a surface compressive stress of less than 3 MPa as measured by a surface stress meter.

12. The laminate of claim 3 , wherein the laminate is substantially free of visual distortion as measured by ASTM C1652/C1652M.

13. The laminate of claim 3 , wherein the second curved glass substrate is strengthened.

14. The laminate of claim 13 , wherein the first curved glass substrate is unstrengthened.

15. The laminate of claim 13 , wherein the first curved glass substrate is strengthened.

16. The laminate of claim 3 , wherein the first curved glass substrate and the second curved glass substrate comprise a soda lime silicate glass.

17. The laminate of claim 3 , where the laminate is complexly curved.

18. A vehicle comprising:
a body defining an interior and an opening in communication with the interior;
a complexly curved laminate disposed in the opening, the laminate comprising
a first curved glass substrate comprising a first major surface, a second major surface opposing the first major surface, a first thickness defined as the distance between the first major surface and second major surface, and a first sag depth of about 2 mm or greater, the first curved glass substrate comprising a first viscosity (poises);
a second curved glass substrate comprising a third major surface, a fourth major surface opposing the third major surface, a second thickness defined as the distance between the third major surface and the fourth major surface that is less than the first thickness, and a second sag depth of about 2 mm or greater; and
an interlayer disposed between the first curved glass substrate and the second curved glass substrate and adjacent the second major surface and third major surface,
wherein the first sag depth is within 10% of the second sag depth and a shape deviation between the first glass substrate and the second glass substrate of ±5 mm or less as measured by an optical three-dimensional scanner, and
wherein one of or both the first major surface and the fourth major surface exhibit an optical distortion of less than 200 millidiopters as measured by an optical distortion detector using transmission optics,
wherein the first curved glass substrate comprises a membrane tensile stress of less than 7 MPa according to ASTM C1279, and
wherein a glass stack of the first curved glass substrate and the second curved glass substrate comprises an effective viscosity that is between the first viscosity and a second viscosity of the second curved glass substrate at a temperature (T) in a range from about 500° C. to about 700° C., and is determined by the equation: μ eff (T)=((μ 1 (T)t 1 )/(t 1 +t 2 ))+((μ 2 (T)t 2 )/(t 1 +t 2 )), where μ 1 (T) is the viscosity of the first curved glass substrate at temperature (T), t 1 is the thickness of the first curved glass substrate, μ 2 (T) is the viscosity of the second curved glass substrate at temperature (T), t 2 is the thickness of the second curved glass substrate.

19. The vehicle of claim 18 , wherein the second curved glass substrate comprises a second viscosity that differs from the first viscosity at a temperature of about 630° C.

20. The vehicle of claim 18 , wherein the first thickness is from about 3 times to about 10 times the second thickness or from 4 times to about 10 times the second thickness.

21. The vehicle of claim 20 , wherein the first curved glass substrate and the second curved glass substrate comprise a soda lime silicate glass.

22. The vehicle of claim 20 , wherein the first thickness is about 1.6 mm or greater, and the second thickness is in a range from about 0.1 mm to less than about 1.6 mm.

23. The vehicle of claim 20 , wherein first curved substrate comprises a first sag temperature and the second curved glass substrate comprises a second sag temperature that differs from the first sag temperature.

24. The vehicle of claim 20 , wherein the shape deviation is about ±1 mm.

25. The vehicle of claim 20 , wherein the optical distortion is 100 millidiopters or less.

26. The vehicle of cla

Assignees

• Corning Inc

Inventors

• Fredholm Michele Marie-Louise

Classifications

• B32B17/1077

  containing polyurethane · CPC title

• B32B17/10137

  Chemical strengthening · CPC title

• B32B17/101

  having a predetermined coefficient of thermal expansion [CTE] · CPC title

• B32B2605/006

  Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings · CPC title

• C03B23/0357

  by suction without blowing, e.g. with vacuum or by venturi effect · CPC title