Durable glass for vehicle

Patent metadata

Field	Value
Publication number	US-11511523-B2
Application number	US-202016952910-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Nov 21, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A multilayer glass stack for a vehicle windshield with improved durability is described. The multilayer glass stack includes an external-facing glass layer, an internal-facing glass layer, and an adhesive interlayer positioned between the external-facing and internal-facing glass layers. The external-facing glass layer may include borosilicate and/or does not include soda lime glass. Methods of manufacturing the multilayer glass stack are also described.

First claim

What is claimed is:

1. A multilayer glass stack for a vehicle windshield, comprising:
an external-facing glass layer comprising borosilicate;
an internal-facing glass layer;
an adhesive interlayer positioned between the external-facing and internal-facing glass layers, wherein the adhesive interlayer comprises an adhesive, wherein the multilayer glass stack is a vehicle windshield and is shaped to fit into a vehicle windshield frame; and
a viewing area comprising an optical distortion of less than about 250 millidiopters;
wherein the multilayer glass stack has at most a 10% chance of failure with an impact of 2 J.

2. The multilayer glass stack of claim 1 , wherein the multilayer glass stack has an area density of about 7.5 kg/m 2 to about 10 kg/m 2 .

3. The multilayer glass stack of claim 1 , wherein the multilayer glass stack has at most a 10% chance of failure with an impact of 3 J.

4. The multilayer glass stack of claim 1 , wherein the vehicle windshield is selected from the group consisting of a front windshield, a side windshield, a back windshield, a top windshield, and combinations thereof.

5. The multilayer glass stack of claim 1 , wherein the external-facing glass layer has at most a 10% chance of failure with an impact of 2 J.

6. The multilayer glass stack of claim 1 , wherein the external-facing glass layer has a thickness of about 2 mm to about 5 mm.

7. The multilayer glass stack of claim 1 , wherein the external-facing glass layer is an outermost layer of the multilayer glass stack.

8. The multilayer glass stack of claim 1 , wherein the external-facing glass layer is shatter resistant or shatterproof.

9. The multilayer glass stack of claim 1 , wherein the external-facing glass layer resistant to crack initiation and crack propagation.

10. The multilayer glass stack of claim 1 , wherein the external-facing glass layer does not comprise soda lime glass.

11. The multilayer glass stack of claim 1 , wherein the internal-facing glass layer comprises a material selected from the group consisting of aluminosilicate, tempered glass, and combinations thereof.

12. The multilayer glass stack of claim 1 , wherein the internal-facing glass layer has a thickness of about 0.5 mm to about 1.1 mm.

13. The multilayer glass stack of claim 1 , wherein the internal-facing glass layer is an outermost layer of the multilayer glass stack.

14. The multilayer glass stack of claim 1 , wherein a thickness ratio of the external-facing glass layer:internal-facing glass layer is greater than 1:1.

15. The multilayer glass stack of claim 14 , wherein the thickness ratio of the external-facing glass layer:internal-facing glass layer is greater than 1:1 to about 10:1.

16. The multilayer glass stack of claim 1 , wherein the adhesive interlayer has energy absorptive properties.

17. The multilayer glass stack of claim 1 , wherein the adhesive interlayer has a glass transition temperature of about 6° C. to about 10° C.

18. The multilayer glass stack of claim 1 , wherein the adhesive interlayer comprises multiple layers.

19. The multilayer glass stack of claim 1 , wherein the adhesive comprises a polyvinyl ether (PVE).

20. The multilayer glass stack of claim 1 , further comprising at least one additional layer, wherein the at least one additional layer is selected from the group consisting of a light absorbing layer, a light reflecting layer, an acoustic dampening layer, and combinations thereof.

21. The multilayer glass stack of claim 20 , wherein the at least one additional layer comprises a light absorbing layer, and the light absorbing layer comprises a tint material.

22. The multilayer glass stack of claim 1 , further comprising an element selected from the group consisting of a camera, a sensor, a heating element, a waveguide, an incoupling optical element, an outcoupling optical element, a light injection device, and combinations thereof.

23. The multilayer glass stack of claim 1 , wherein the vehicle windshield has a curvilinear shape.

24. The multilayer glass stack of claim 1 , wherein the vehicle windshield is configured to break into pieces which comply with a governmental safety guideline.

25. A vehicle comprising a vehicle frame and the multilayer glass stack of claim 1 .

26. The vehicle of claim 25 , wherein the vehicle further comprises an electric motor.

27. The vehicle of claim 25 , wherein the vehicle further comprises a camera positioned facing the internal-facing glass layer of the multilayer glass stack.

28. The vehicle of claim 27 , wherein the camera is positioned to view through the viewing area.

Assignees

• Tesla Inc

Inventors

• Mottsmith Rosemary
• Pilliod Michael
• Sweney William S
• Lamastra Dante
• Gougoussis Christos

Classifications

• B32B17/10091

  thermally hardened · CPC title

• B32B2307/584

  Scratch resistance · CPC title

• B32B2250/40

  Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA · CPC title

• B32B17/10137 Primary

  Chemical strengthening · CPC title

• B32B2605/08

  Cars · CPC title