# US 10,307,992 B2 · Thin laminated glass

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- Number: US 10,307,992 B2
- Document ID: US10307992B2
- Status: Granted
- Kind: B2
- Application number: 15/031,380
- Filed: 2014-10-22
- Published: 2016-09-15
- Granted: 2019-06-04
- Earliest claimed: 2013-10-23
- Assignees: Saint-Gobain Glass France
- Applicants: Saint-Gobain Glass France
- Inventors: Claire Lestringant; René Gy; Stephan Kremers
- Web page: https://patentgrep.com/patent/US10307992B2

## CPC

- B32B 17/101: {having a predetermined coefficient of thermal expansion [CTE]}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10119: {having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate}
- B32B 17/10761: {containing vinyl acetal}
- B60J 1/02: arranged at the vehicle front {, e.g. structure of the glazing, mounting of the glazing (on windscreen mounted antenna wire H01Q1/1271)}
- B60J 7/043: Sunroofs (B60J7/047 - B60J7/053 take precedence){e.g. sliding above the roof}
- B64C 1/1484: {Windows (B64C1/1492 takes precedence)}
- B64C 1/1492: {Structure and mounting of the transparent elements in the window or windscreen}
- B32B 2307/30: having particular thermal properties
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- B32B 2605/18: Aircraft
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05)
- B64C: AEROPLANES; HELICOPTERS

## Abstract

A laminated glazing includes at least one outer glass sheet and a polymeric sheet, in which the outer glass sheet has a thickness of not more than 2 mm and a coefficient of thermal expansion of less than 70×10−7 K−1.

## Claims

### Claim 1

A laminated windshield of a vehicle, the laminated windshield being resistant to projections of gravel and comprising:
at least one outer glass sheet for facing an exterior of the vehicle,
at least one inner glass sheet for facing an interior of the vehicle, the inner glass sheet having a thickness of not more than 1.1 mm, and
a polymeric sheet located between the inner and outer glass sheets,
wherein the inner glass sheet is thinner than the outer glass sheet,
wherein the outer glass sheet has a thickness of not more than 1.6 mm and a coefficient of thermal expansion of less than 50×10−7 K−1,
wherein the inner glass sheet has a chemical composition of a soda-lime glass, and
wherein the laminated windshield is a bent windshield for being mounted to the vehicle such that the inner glass sheet is more proximal to the interior of the vehicle than the outer glass sheet is, and
wherein the polymeric sheet has a thickness from 500 μm to 4 mm.

### Claim 2 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the outer glass sheet has a chemical composition of a borosilicate glass.

### Claim 3 (depends on 2)

The laminated windshield as claimed in claim 2, wherein the outer glass sheet comprises
SiO2
75-85%,
Al2O3
2-3%,
B2O3
10-15%,
Na2O + K2O
3-7%.

### Claim 4 (depends on 2)

The laminated windshield as claimed in claim 2, wherein the outer glass sheet comprises
SiO2
60-65%,
Al2O3
13-18%,
B2O3
8-14%,
CaO + MgO + SrO
6-10%.

### Claim 5 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the outer glass sheet has a chemical composition of a lithium aluminosilicate glass and comprises
SiO2
52-75%,
Al2O3
15-27%,
Li2O
2-10%,
Na2O
0-1%,
K2O
0-5%,
CaO
0-0.5%,
ZnO
0-5%,
MgO
0-5%,
BaO
0-5%,
SrO
0-3%,
TiO2
0-6%,
ZrO2
0-3%,
P2O5
0-8%.

### Claim 6 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the polymeric sheet comprises one or more layers of thermoplastic material chosen from polyurethane, polycarbonate, polyvinyl butyral (PVB), polymethyl methacrylate (PMMA) and ethylene-vinyl acetate (EVA) or an ionomeric resin.

### Claim 7 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the polymeric sheet comprises at least one layer of PVB.

### Claim 8 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the outer glass sheet is a sheet that is not chemically or thermally reinforced.

### Claim 9 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the laminated windshield constitutes a motor vehicle laminated windshield.

### Claim 10 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the laminated windshield constitutes a laminated windshield for helicopters.

### Claim 11 (depends on 1)

The laminated windshield as claimed in claim 1, wherein the inner glass sheet has a thickness of less than 1 mm.

### Claim 12

The laminated windshield as claimed 1, wherein the outer glass sheet has a thickness of not more than 1.1 mm.

### Claim 13 (depends on 1)

The laminated windshield as claim 1, wherein a total thickness of the inner glass sheet, the outer glass sheet and the polymeric sheet is less than 4.5 mm.

### Claim 14 (depends on 13)

The laminated windshield as claim 13, wherein a total thickness of the inner glass sheet, the outer glass sheet and the polymeric sheet is less than 4 mm.

### Claim 15 (depends on 1)

The glazing as claimed in claim 1, wherein the polymeric sheet has a thickness from 760 μm to 4 mm.

### Claim 16

A bent laminated windshield of a vehicle, the bent laminated windshield being resistant to projections of gravel and comprising:
at least one bent outer glass sheet with a convex outer surface for facing an exterior of the vehicle,
at least one bent inner glass sheet with a concave inner surface for facing an interior of the vehicle, the bent inner glass sheet having a thickness of not more than 1.1 mm, and
a polymeric sheet located between the inner and outer glass sheets,
wherein the bent inner glass sheet is thinner than the bent outer glass sheet,
wherein the bent outer glass sheet has a thickness of not more than 1.6 mm and a coefficient of thermal expansion of less than 50×10−7 K−1,
wherein the bent inner glass sheet has a chemical composition of a soda-lime glass,
wherein the bent laminated windshield is for being mounted to the vehicle such that the bent inner glass sheet is more proximal to the interior of the vehicle than the bent outer glass sheet is, and
wherein the polymeric sheet has a thickness from 500 μm to 4 mm.

### Claim 17 (depends on 16)

The bent laminated windshield as claimed in claim 16, wherein the bent outer glass sheet has a chemical composition of a borosilicate glass.

### Claim 18 (depends on 17)

The bent laminated windshield as claimed in claim 17, wherein the bent outer glass sheet comprises
SiO2
75-85%,
Al2O3
2-3%,
B2O3
10-15%,
Na2O + K2O
3-7%.

### Claim 19 (depends on 16)

The bent laminated windshield as claimed in claim 16, wherein the polymeric sheet has a thickness from 760 μm to 4 mm.

### Claim 20

A vehicle comprising a bent laminated windshield, the bent laminated windshield being resistant to projections of gravel and comprising:
at least one outer glass sheet for facing an exterior of the vehicle,
at least one inner glass sheet for facing an interior of the vehicle, the inner glass sheet having a thickness of not more than 1.1 mm, and
a polymeric sheet located between the inner and outer glass sheets,
wherein the inner glass sheet is thinner than the outer glass sheet,
wherein the outer glass sheet has a thickness of not more than 1.6 mm and a coefficient of thermal expansion of less than 50×10−7 K−1,
wherein the inner glass sheet has a chemical composition of a soda-lime glass,
wherein the bent laminated windshield is mounted to the vehicle such that the inner glass sheet is more proximal to the interior of the vehicle than the outer glass sheet is, and
wherein the polymeric sheet has a thickness from 500 μm to 4 mm.

### Claim 21 (depends on 20)

The vehicle as claimed in claim 20, wherein the outer glass sheet has a chemical composition of a borosilicate glass.

### Claim 22 (depends on 21)

The vehicle as claimed in claim 21, wherein the outer glass sheet comprises
SiO2
75-85%,
Al2O3
2-3%,
B2O3
10-15%,
Na2O + K2O
3-7%.

### Claim 23 (depends on 20)

The vehicle as claimed in claim 20, wherein the polymeric sheet has a thickness from 760 μm to 4 mm.