US 12,077,036 B2
Laminated glass for vehicle
Takato Kajihara, Tokyo (JP); Shigeki Sawamura, Tokyo (JP); Shusaku Akiba, Tokyo (JP); and Yutaka Kuroiwa, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Oct. 28, 2022, as Appl. No. 18/050,669.
Application 18/050,669 is a continuation of application No. PCT/JP2021/016561, filed on Apr. 26, 2021.
Claims priority of application No. 2020-081159 (JP), filed on May 1, 2020.
Prior Publication US 2023/0120488 A1, Apr. 20, 2023
Int. Cl. B60J 1/02 (2006.01); B32B 7/02 (2019.01); B32B 17/10 (2006.01); B32B 27/30 (2006.01); B60J 1/00 (2006.01); C03C 3/087 (2006.01); C03C 3/091 (2006.01); C03C 3/095 (2006.01); C03C 4/00 (2006.01)
CPC B60J 1/02 (2013.01) [B32B 7/02 (2013.01); B32B 17/10036 (2013.01); B32B 17/10761 (2013.01); B32B 27/30 (2013.01); B60J 1/001 (2013.01); C03C 3/087 (2013.01); C03C 3/091 (2013.01); C03C 3/095 (2013.01); C03C 4/00 (2013.01); B32B 2250/40 (2013.01); B32B 2307/54 (2013.01); B32B 2307/558 (2013.01); B32B 2307/732 (2013.01); B32B 2605/006 (2013.01); C03C 2205/00 (2013.01)] 32 Claims
OG exemplary drawing
 
1. A vehicular laminated glass comprising:
a first glass plate;
a second glass plate; and
an intermediate film sandwiched between the first glass plate and the second glass plate, wherein
a total thickness of the first glass plate, the second glass plate, and the intermediate film is 4.0 mm or larger;
the first glass plate is thicker than the second glass plate;
the first glass plate and the second glass plate are each a borosilicate glass containing B2O3 at 1.0% or more in mole percentage in terms of oxides;
a composition of the borosilicate glass of at least one of the first glass plate and the second glass plate is given as follows in mole percentage in terms of oxides:
85%≤SiO2+Al2O3+B2O3≤98%,
60%≤SiO2≤90%,
0%≤Al2O3≤10%,
1.0%≤B2O3≤25%,
1.0%≤R2O≤10%,
0%≤RO≤9.0%,
0≤Li2O/R2O≤1.0,
0≤Na2O/R2O≤0.90, and
0≤K2O/R2O≤0.70,
where R2O represents a total content of Li2O, Na2O, and K2O and RO represents a total content of MgO, CaO, SrO and BaO;
when the first glass plate satisfies the composition above, the first glass plate has a relative permittivity at 10 GHz of 6.00 or lower; and
when the second glass plate satisfies the composition above, the second glass plate has a relative permittivity at 10 GHz of 6.00 or lower; and
a transmission characteristic S21 that is obtained when TM radio waves having a frequency of 79 GHz enter the first glass plate of the vehicular laminated glass at an incident angle of 60° is −4.0 dB or larger.