A phase-separated glass for chemical strengthening has a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of 4.2 or less, when measured in a form of a plate having a thickness of 1 mm.
1. A phase-separated glass, comprising:
SiO 2 ;
from 2% to 7% of B 2 O 3 in terms of mole percentage;
from 10% to 30% MgO in terms of mole percentage;
from 0 to 5% of CaO in terms of mole percentage; and
from 0 to 15% of BaO in terms of mole percentage;
wherein:
a total content of MgO, CaO, and BaO in the phase-separated glass in terms of mole percentage is from 12% to 30%;
the phase-separated glass has a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of 4.2 or less, when measured in a form of a plate having a thickness of 1 mm; and
a dispersed phase of the phase-separated glass has an average particle size of from 0.2 μm to 5 μm.
2. The phase-separated glass according to claim 1 , comprising, in terms of mole percentage:
from 50% to 80% of SiO 2 ;
from 2% to 7% of B 2 O 3 ;
from 0 to 10% of Al 2 O 3 ;
from 10% to 30% of MgO;
from 5% to 15% of Na 2 O;
from 0 to 5% of CaO;
from 0 to 15% of BaO; and
from 0 to 10% of P 2 O 5 .
3. The phase-separated glass according to claim 1 , wherein when reflected light from a D65 light source is measured with respect to the phase-separated glass for chemical strengthening which has been formed into a plate having a thickness of 1 mm and placed on a white standard board having L* value of 98.44, a* value of −0.20 and b* value of 0.23 [EVER-WHITE (Code No. 9582), a product of Evers Corporation], a measured value thereof is positioned within an area enclosed in a quadrilateral specified by A(0.324, 0.333), B(0.314, 0.338), C(0.302, 0.325) and D(0.311, 0.320) in CIE chromaticity coordinates.
4. The phase separated glass according to claim 1 , which has a binodal state.
5. The phase separated glass according to claim 1 , wherein a volume percentage of particles of the dispersed phase in the phase-separated glass is 10% or more.
6. The phase-separated glass according to claim 1 , wherein the total light reflectance is 12% or more.
7. The phase-separated glass according to claim 1 , wherein the total light reflectance is 20% or more.
8. The phase-separated glass according to claim 1 , wherein the value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance is 3.5 or less.
9. The phase-separated glass according to claim 1 , wherein the value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance is 3 or less.
10. The phase-separated glass according to claim 1 , wherein a dispersed phase thereof has an average particle size of from 0.4 μm to 4 μm.
11. A chemically-strengthened phase-separated glass, which has been obtained by chemically strengthening the phase-separated glass according to claim 1 .
12. A housing, wherein a part or whole of the housing is the chemically-strengthened glass according to claim 11 .
13. The housing according to claim 12 , which is a housing of an electronic device.
14. A phase-separated glass, comprising, in terms of mole percentage:
from 50% to 80% of SiO 2 ;
from 2% to 7% of B 2 O 3 ;
from 0 to 10% of Al 2 O 3 ;
from 10% to 30% of MgO;
from 5% to 15% of Na 2 O;
from 0 to 5% of CaO;
from 0 to 15% of BaO; and
from 0 to 10% of P 2 O 5 ;
wherein:
a total content of MgO, CaO, and BaO is from 12% to 30%, and having a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of 4.2 or less.
15. The phase-separated glass according to claim 5 , comprising, in terms of mole percentage, from 0.5% to 10% of P 2 O 5 .
16. A phase-separated glass, comprising:
SiO 2 ;
from 2% to 7% of B 2 O 3 in terms of mole percentage;
from 10% to 30% of MgO in terms of mole percentage;
from 5% or more of Na 2 O in terms of mole percentage;
from 0 to 5% CaO in terms of mole percentage; and
from 0 to 15% BaO in terms of mole percentage;
wherein:
a total content of MgO, CaO, and BaO in the phase-separated glass in terms of mole percentage is from 12% to 30%;
the phase-separated glass has a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of 4.2 or less, when measured in a form of a plate having a thickness of 1 mm; and
a dispersed phase of the phase-separated glass has an average particle size of from 0.2 μm to 5 μm.
17. The phase-separated glass according to claim 16 , comprising, in terms of mole percentage:
from 50% to 80% of SiO 2 ;
from 2% to 7% of B 2 O 3 ;
from 0 to 10% of Al 2 O 3 ;
from 10% to 30% of MgO;
from 5% to 15% of Na 2 O;
from 0 to 5% of CaO;
from 0 to 15% of BaO; and
from 0 to 10% of P 2 O 5 .
18. The phase-separated glass according to claim 16 , wherein when reflected light from a D65 light source is measured with respect to the phase-separated glass for chemical strengthening which has been formed into a plate having a thickness of 1 mm and placed on a white standard board having L* value of 98.44, a* value of −0.20 and b* value of 0.23 [EVER-WHITE (Code No. 9582), a product of Evers Corporation], a measured value thereof is positioned within an area enclosed in a quadrilateral specified by A(0.324, 0.333), B(0.314, 0.338), C(0.302, 0.325) and D(0.311, 0.320) in CIE chromaticity coordinates.
19. The phase separated glass according to claim 16 , which has a binodal state.
20. The phase separated glass according to claim 16 , wherein a volume percentage of particles of the dispersed phase in the phase-separated glass is 10% or more.
21. The phase-separated glass according to claim 16 , wherein the total light reflectance is 12% or more.
22. The phase-separated glass according to claim 16 , wherein the total light reflectance is 20% or more.
23. The phase-separated glass according to claim 16 , wherein the value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance is 3.5 or less.
24. The phase-separated glass according to claim 16 , wherein the value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance is 3 or less.
25. The phase-separated glass according to claim 16 , wherein a dispersed phase thereof has an average particle size of from 0.4 μm to 4 μm.