# US 11,305,517 B2 · Stiff interlayers for laminated glass structures

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- Number: US 11,305,517 B2
- Document ID: US11305517B2
- Status: Granted
- Kind: B2
- Application number: 16/788,363
- Filed: 2020-02-12
- Published: 2020-06-11
- Granted: 2022-04-19
- Earliest claimed: 2012-05-31
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: William Keith Fisher; Mark Stephen Friske; Anurag Jain
- Web page: https://patentgrep.com/patent/US11305517B2

## CPC

- B32B 17/10036: {comprising two outer glass sheets}
- B32B 1/00: Layered products having a non-planar shape
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 7/022: Mechanical properties
- B32B 17/10137: {Chemical strengthening}
- B32B 17/10743: {containing acrylate (co)polymers or salts thereof}
- B32B 17/10752: {containing polycarbonate}
- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10779: {containing polyester}
- B32B 17/10788: {containing ethylene vinylacetate}
- B32B 2250/03: 3 layers
- B32B 2250/05: 5 or more layers
- B32B 2307/102: Insulating
- B32B 2307/40: having particular optical properties
- B32B 2307/51: Elastic
- B32B 2307/56: Damping, energy absorption
- B32B 2419/00: Buildings or parts thereof
- B32B 2451/00: Decorative or ornamental articles
- B32B 2605/00: Vehicles
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24967: Absolute thicknesses specified
- Y10T 428/24983: Hardness
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A new laminated glass structure for automotive glazing, architectural window and other applications that includes two sheets of relatively thin, optionally chemically strengthened glass, such as Corning® Gorilla® Glass, with a composite interlayer structure that includes at least one relatively stiff layer having relatively high Young's modulus of 50 MPa or higher and a relatively softer polymer layer having a relatively low Young's modulus of 20 MPa or lower.

## Claims

### Claim 1

A glass laminate comprising:
a first chemically strengthened alkali aluminosilicate glass sheet having a thickness of 1.5 mm or less, wherein the first chemically strengthened alkali aluminosilicate glass sheet has a compressive stress of greater than about 600 MPa, a depth of layer greater than about 40 micrometers, and a tensile stress between about 40 and 65 MPa;
a second glass sheet; and
a composite interlayer positioned between the first and second glass sheets, the composite interlayer comprising:
two outer polymer layers having a Young's modulus of 50 MPa or greater, and selected from the group consisting of polyvinyl butyral (PVB), poly carbonate (PC), or polyethylene terephthalate (PET), and
an inner polymer layer having a Young's modulus of less than 20 MPa, and selected from the group consisting of polyvinyl butyral (PVB), acoustic poly vinyl butyral (A -PVB), ethylene vinyl acetate (EVA), plasticized polyvinyl chloride (PVC), or thermoplastic polyurethane (TPU),
wherein the inner polymer layer is disposed between the two outer polymer layers.

### Claim 2 (depends on 1)

The glass laminate of claim 1, wherein the two outer polymer layers have a Young's modulus of 100 MPa or greater.

### Claim 3 (depends on 1)

The glass laminate of claim 1, wherein the two outer polymer layers have a Young's modulus ranging from 100 MPa to 1000 MPa.

### Claim 4 (depends on 1)

The glass laminate of claim 1, wherein the inner polymer layer has a Young's modulus of 10 MPa or less.

### Claim 5 (depends on 1)

The glass laminate of claim 1, wherein the inner polymer layer has a Young's modulus ranging from 1 MPa to 10 MPa.

### Claim 6 (depends on 1)

The glass laminate of claim 1, wherein the two outer polymer layers have a Young's modulus 10-100 times greater than the Young's modulus of the inner polymer layer.

### Claim 7 (depends on 1)

The glass laminate of claim 1, wherein the composite interlayer makes up a majority of a total thickness of the glass laminate.

### Claim 8 (depends on 7)

The glass laminate of claim 7, wherein the composite interlayer makes up at least 57% of the total thickness of the glass laminate.

### Claim 9 (depends on 7)

The glass laminate of claim 7, wherein at least one of the first or second glass sheets has a thickness ranging from 0.5 mm to 1.5 mm.

### Claim 10 (depends on 1)

The glass laminate of claim 1 comprising a total thickness of from about 2 mm to about 4 mm.

### Claim 11 (depends on 1)

The glass laminate of claim 1, wherein the second glass sheet is chemically strengthened.

### Claim 12 (depends on 1)

The glass laminate of claim 1, wherein the second glass sheet is non-chemically-strengthened.

### Claim 13 (depends on 1)

The glass laminate of claim 1, wherein the first chemically strengthened alkali aluminosilicate glass sheet comprises from 8 mol % to about 18 mol % Na2O.

### Claim 14 (depends on 1)

The glass laminate of claim 1, wherein the first chemically strengthened alkali aluminosilicate glass sheet comprises from 9 mol % to about 21 mol % Na2O.

### Claim 15 (depends on 1)

The glass laminate of claim 1, wherein the first chemically strengthened alkali aluminosilicate glass sheet is an alkali aluminoborosilicate glass.