LAMINATED GLASS, WINDOW GLASS FOR AUTOMOBILES, AND WINDOW GLASS FOR BUILDINGS
A laminated glass includes, in the following order, a first glass plate, a first transparent adhesive layer, a transparent heat-insulating layer having interconnected pores, a second transparent adhesive layer, and a second glass plate. The laminated glass has a value of A in the expression (1) of 7.0×10 5 or smaller and a value of B in the expression (2) of 35 or larger. In the expressions, D is a pore diameter (nm) of the interconnected pores of the transparent heat-insulating layer, P is a porosity of the transparent heat-insulating layer, d i is a thickness (mm) of the transparent heat-insulating layer, d g is a sum (mm) of a thickness of the first glass plate and a thickness of the second glass plate, and d a is a sum (mm) of a thickness of the first transparent adhesive layer and a thickness of the second transparent adhesive layer; [ Math . 1 ] A = D 3 Pd i ( 1 ) B = d g + 3.3 d e + 0.75 d i ( D + 260.8 0.026 D ) P ( 2 )
1 . A laminated glass comprising, in the following order, a first glass plate, a first transparent adhesive layer, a transparent heat-insulating layer having interconnected pores, a second transparent adhesive layer, and a second glass plate, and having
a value of A represented by the following expression (1) of 7.0×10 5 or smaller and
a value of B represented by the following expression (2) of 35 or larger,
[
Math
.
1
]
A
=
D
3
Pd
i
(
1
)
B
=
d
g
+
3.3
d
a
+
0.75
d
i
(
D
+
260.8
0.026
D
)
P
(
2
)
wherein D is a pore diameter (nm) of the interconnected pores of the transparent heat-insulating layer, P is a porosity of the transparent heat-insulating layer, d i is a thickness (mm) of the transparent heat-insulating layer, d g is a sum (mm) of a thickness of the first glass plate and a thickness of the second glass plate, and d a is a sum (mm) of a thickness of the first transparent adhesive layer and a thickness of the second transparent adhesive layer.
2 . The laminated glass according to claim 1 , wherein the value of A is 2.5×10 5 or smaller and the value of B is 85 or larger.
3 . The laminated glass according to claim 1 , wherein the transparent heat-insulating layer has an elastic modulus in compression of 4.3 MPa or higher.
4 . The laminated glass according to claim 1 , wherein the transparent heat-insulating layer is an aerogel sheet.
5 . The laminated glass according to claim 1 , wherein the transparent heat-insulating layer contains a filler.
6 . The laminated glass according to claim 1 , wherein the thickness of the transparent heat-insulating layer is 0.2 to 10 mm.
7 . The laminated glass according to claim 1 , wherein the thickness of the first glass plate and the thickness of the second glass plate are each 0.1 to 6 mm.
8 . The laminated glass according to claim 1 , wherein the thickness of the first transparent adhesive layer and the thickness of the second transparent adhesive layer are each 0.1 to 3 mm.
9 . A window glass for automobiles which comprises the laminated glass according to claim 1 .
10 . A window glass for buildings which comprises the laminated glass according to claim 1 .