Thin laminated glass
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 .
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.
2. The laminated windshield as claimed in claim 1 , wherein the outer glass sheet has a chemical composition of a borosilicate glass.
3. The laminated windshield as claimed in claim 2 , wherein the outer glass sheet comprises
SiO 2
75-85%,
Al 2 O 3
2-3%,
B 2 O 3
10-15%,
Na 2 O + K 2 O
3-7%.
4. The laminated windshield as claimed in claim 2 , wherein the outer glass sheet comprises
SiO 2
60-65%,
Al 2 O 3
13-18%,
B 2 O 3
8-14%,
CaO + MgO + SrO
6-10%.
5. The laminated windshield as claimed in claim 1 , wherein the outer glass sheet has a chemical composition of a lithium aluminosilicate glass and comprises
SiO 2
52-75%,
Al 2 O 3
15-27%,
Li 2 O
2-10%,
Na 2 O
0-1%,
K 2 O
0-5%,
CaO
0-0.5%,
ZnO
0-5%,
MgO
0-5%,
BaO
0-5%,
SrO
0-3%,
TiO 2
0-6%,
ZrO 2
0-3%,
P 2 O 5
0-8%.
6. 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.
7. The laminated windshield as claimed in claim 1 , wherein the polymeric sheet comprises at least one layer of PVB.
8. The laminated windshield as claimed in claim 1 , wherein the outer glass sheet is a sheet that is not chemically or thermally reinforced.
9. The laminated windshield as claimed in claim 1 , wherein the laminated windshield constitutes a motor vehicle laminated windshield.
10. The laminated windshield as claimed in claim 1 , wherein the laminated windshield constitutes a laminated windshield for helicopters.
11. The laminated windshield as claimed in claim 1 , wherein the inner glass sheet has a thickness of less than 1 mm.
12. The laminated windshield as claimed 1 , wherein the outer glass sheet has a thickness of not more than 1.1 mm.
13. 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.
14. 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.
15. The glazing as claimed in claim 1 , wherein the polymeric sheet has a thickness from 760 μm to 4 mm.
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.
17. The bent laminated windshield as claimed in claim 16 , wherein the bent outer glass sheet has a chemical composition of a borosilicate glass.
18. The bent laminated windshield as claimed in claim 17 , wherein the bent outer glass sheet comprises
SiO 2
75-85%,
Al 2 O 3
2-3%,
B 2 O 3
10-15%,
Na 2 O + K 2 O
3-7%.
19. The bent laminated windshield as claimed in claim 16 , wherein the polymeric sheet has a thickness from 760 μm to 4 mm.
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.
21. The vehicle as claimed in claim 20 , wherein the outer glass sheet has a chemical composition of a borosilicate glass.
22. The vehicle as claimed in claim 21 , wherein the outer glass sheet comprises
SiO 2
75-85%,
Al 2 O 3
2-3%,
B 2 O 3
10-15%,
Na 2 O + K 2 O
3-7%.
23. The vehicle as claimed in claim 20 , wherein the polymeric sheet has a thickness from 760 μm to 4 mm.