Laminated glazing

Patent metadata

Field	Value
Publication number	US-12420529-B2
Application number	US-202117926851-A
Country	US
Kind code	B2
Filing date	Jun 16, 2021
Priority date	Jun 16, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A bent laminated glazing, in particular for a motor vehicle windscreen, includes a first glass sheet adhesively bonded to a second glass sheet by a lamination interlayer, the first glass sheet including a face, referred to as face 2, facing the lamination interlayer, and the second glass sheet including a face, referred to as face 4, opposite the lamination interlayer, wherein the face 2 includes a region, referred to as first region, coated with a layer of opaque mineral paint obtained from an aqueous paint composition including pigments and an aqueous solution of alkali metal silicate, and the face 4 includes a region, referred to as second region, coated with an enamel coating.

First claim

The invention claimed is:

1. A bent laminated glazing comprising a first glass sheet adhesively bonded to a second glass sheet by a lamination interlayer, said first glass sheet comprising a face facing said lamination interlayer, and said second glass sheet comprising a face opposite said lamination interlayer, wherein said face of the first glass sheet comprises a first region, coated with a layer of opaque mineral paint obtained from an aqueous paint composition comprising pigments and an aqueous solution of alkali metal silicate, and said face of the second glass sheet comprises a second region, coated with an enamel coating, wherein said bent laminated glazing comprises an optical sensor transmission window that is formed only by the layer of opaque mineral paint.

2. The bent laminated glazing according to claim 1 , wherein the layer of opaque mineral paint is black.

3. The bent laminated glazing according to claim 2 , wherein a lightness L* measured in reflection on a glass side of the first glass sheet opposite the first region is less than 5.

4. The bent laminated glazing according to claim 1 , wherein the first region represents between 2 and 25% of a surface area of the face of the first glass sheet.

5. The bent laminated glazing according to claim 4 , wherein the first region represents between 3 and 20% of the surface area of the face of the first glass sheet.

6. The bent laminated glazing according to claim 1 , wherein a thickness of the layer of mineral paint is between 2 and 20 μm.

7. The bent laminated glazing according to claim 6 , wherein the thickness of the layer of mineral paint is between 3 and 15 μm.

8. The bent laminated glazing according to claim 1 , wherein the second region represents between 1 and 15% of a surface area of the face of the second glass sheet.

9. The bent laminated glazing according to claim 8 , wherein the second region represents between 2 and 10% of the surface area of the face of the second glass sheet.

10. The bent laminated glazing according to claim 1 , wherein the second region is in the form of a peripheral strip.

11. The bent laminated glazing according to claim 1 , wherein the second region is facing at least part of the first region.

12. The bent laminated glazing according to claim 1 , wherein, in the layer of mineral paint, a content by weight of alkali metal silicate is between 7% and 60% and a total content by weight of pigments and mineral fillers is between 20 and 90%.

13. The bent laminated glazing according to claim 12 , wherein, in the layer of mineral paint, the content by weight of alkali metal silicate is between 15% and 55% and the total content by weight of pigments and mineral fillers is between 30 and 70%.

14. The bent laminated glazing according to claim 1 , wherein the bent laminated glazing is a motor vehicle windscreen.

15. The bent laminated glazing according to claim 1 , wherein the layer of opaque mineral paint defines a periphery of the optical sensor transmission window.

16. The bent laminated glazing according to claim 15 , wherein the layer of opaque mineral paint is in contact with the first glass sheet.

17. A motor vehicle windscreen comprising a glazing according to claim 1 , wherein the layer of opaque mineral paint creates a camera region, said motor vehicle windscreen further comprising at least one sensor arranged facing said camera region and also an assembly seal arranged in contact with the enamel coating.

18. The motor vehicle windscreen according to claim 17 , wherein the first glass sheet corresponds to an external sheet of the windscreen, arranged on a convex side and intended to be positioned outside the vehicle, and the second glass sheet corresponds to an internal sheet of the windscreen, arranged on a concave side and intended to be positioned inside the vehicle.

19. The motor vehicle windscreen according to claim 17 , wherein a surface area of the camera region is between 5 and 300 cm 2 .

20. A method for obtaining a laminated glazing according to claim 1 , comprising:
depositing on the first region, of the face of the first glass sheet, the aqueous paint composition comprising pigments and the aqueous solution of alkali metal silicate, then pre-curing at a temperature of at least 200° C., so as to obtain the layer of opaque mineral paint,
depositing on the second region, of the face of the second glass sheet, the enamel coating, then
bending the first and second glass sheet, then
laminating the first and the second glass sheet by the lamination interlayer, such that said face of the first glass sheet is facing said interlayer and said face of the second glass sheet is opposite said interlayer.

21. The method according to claim 20 , wherein the depositing of the aqueous paint composition is carried out by screen printing.

22. The method according to claim 20 , wherein the pre-curing is carried out at a temperature of at most 580° C.

Assignees

• Saint Gobain

Inventors

• Jamart Juliette

Classifications

• B32B2605/08

  Cars · CPC title

• B32B2605/006

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

• B32B2307/41

  Opaque · CPC title

• B32B2250/02

  2 layers · CPC title

• B32B2038/0076

  Curing, vulcanising, cross-linking · CPC title