LIGHT-WEIGHT HYBRID GLASS LAMINATES

• US 20130295357A1
• Filed: 07/09/2013
• Published: 11/07/2013
• Est. Priority Date: 06/24/2011
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Moore, Michael John, Cleary, Thomas Michael, Huten, Timothy Scott
• Granted Patent: US 9,616,641 B2
• Time in Patent Office: Days
• US Class Current: 428/215
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10091 thermally hardened
• 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 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified

Abstract

A glass laminate comprises an external glass sheet, an internal glass sheet, and a polymer interlayer formed between the external glass sheet and the internal glass sheet. The external glass sheet can be a thin chemically-strengthened glass sheet or can be a non-chemically strengthened glass sheet, the polymer interlayer can have a thickness of less than 1.6 mm, and the internal glass sheet can be a non-chemically-strengthened glass sheet or a thin chemically strengthened glass sheet.

Claims

1. A glass laminate structure comprising:

a non-chemically strengthened external glass sheet;

a chemically strengthened internal glass sheet; and

at least one polymer interlayer intermediate the external and internal glass sheets,

wherein the internal glass sheet has a thickness ranging from about 0.5 mm to about 1.5 mm, and

wherein the external glass sheet has a thickness ranging from about 1.5 mm to about 3.0 mm.

2. The glass laminate structure of claim 1, wherein the internal glass sheet includes one or more alkaline earth oxides, such that a content of alkaline earth oxides is at least about 5 wt. %.

3. The glass laminate structure of claim 1, wherein the internal glass sheet includes at least about 6 wt. % aluminum oxide.

4. The glass laminate structure of claim 1, wherein the internal glass sheet has a thickness of between about 0.5 mm to about 0.7 mm.

5. The glass laminate structure of claim 1, wherein the polymer interlayer comprises a single polymer sheet, a multilayer polymer sheet, or a composite polymer sheet.

6. The glass laminate structure of claim 1, wherein the polymer interlayer comprises a material selected from the group consisting of poly vinyl butyral (PVB), polycarbonate, acoustic PVB, ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU), ionomer, a thermoplastic material, and combinations thereof.

7. The glass laminate structure of claim 1, wherein the polymer interlayer has a thickness of between about 0.4 to about 1.2 mm.

8. The glass laminate structure of claim 1, wherein the external glass sheet comprises a material selected from the group consisting of soda-lime glass and annealed glass.

9. The glass laminate structure of claim 1, wherein the external glass sheet has a thickness of about 2.1 mm.

10. The glass laminate structure of claim 1, wherein the glass laminate has an area greater than 1 m².

11. The glass laminate structure of claim 1, wherein the glass laminate is an automotive windshield, sunroof or cover plate.

12. The glass laminate structure of claim 1, wherein the inner glass layer has a surface compressive stress between about 250 MPa and about 900 MPa.

13. The glass laminate structure of claim 1, wherein the inner glass layer has a surface compressive stress of between about 250 MPa and about 350 MPa and a DOL of compressive stress greater than about 20 μ

m.

14. The glass laminate structure of claim 1 wherein a surface of the external glass layer adjacent the interlayer is acid etched.

15. The glass laminate structure of claim 1 wherein a surface of the internal glass layer opposite the interlayer is acid etched.

16. A glass laminate structure comprising:

a non-chemically strengthened external glass sheet;

a chemically strengthened internal glass sheet; and

at least one polymer interlayer intermediate the external and internal glass sheets,

wherein the inner glass layer has a surface compressive stress between about 250 MPa and about 900 MPa.

17. The glass laminate structure of claim 16, wherein the inner glass layer has a surface compressive stress of between about 250 MPa and about 350 MPa and a DOL of compressive stress greater than about 20 μ

m.

18. The glass laminate structure of claim 16, wherein the internal glass sheet has a thickness ranging from about 0.5 mm to about 1.5 mm, and

wherein the external glass sheet has a thickness ranging from about 1.5 mm to about 3.0 mm.

19. The glass laminate structure of claim 16, wherein the polymer interlayer comprises a material selected from the group consisting of poly vinyl butyral (PVB), polycarbonate, acoustic PVB, ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU), ionomer, a thermoplastic material, and combinations thereof.

20. The glass laminate structure of claim 16, wherein the polymer interlayer has a thickness of between about 0.4 to about 1.2 mm.