Heat-ray- and ultraviolet-absorbent glass sheet, and method for manufacturing same

1. A heat-ray- and ultraviolet-absorbing glass plate that is a soda lime glass comprising, as represented by mass percentage based on oxides:

total iron calculated as Fe 2 O 3

 0.05 to 0.3%,

total tin calculated as SnO 2

 0.02 to 0.5%,

total cerium calculated as CeO 2

 0.01 to 2.9%, and

total sulfur calculated as SO 3

 0.003 to 0.1%,

Se

0.0001 to 0.0050%,

and

having:

a mass proportion of divalent iron calculated as Fe 2 O 3 to the total iron calculated as Fe 2 O 3 being 50% or more,

a visible light transmittance Tv (illuminant A, 2° visual field) as defined in JIS R 3106 (1998) being 66% or more as a value calculated as 4 mm thickness of the glass plate,

a solar transmittance Te as defined in JIS R 3106 (1998) being 65% or less as a value calculated as 4 mm thickness of the glass plate,

a ratio Tv/Te of the visible light transmittance Tv (illuminant A, 2° visual field) as defined in JIS R 3106 (1998) as a value calculated as 4 mm thickness of the glass plate to the solar transmittance Te as defined in JIS R 3106 (1998) as a value calculated as 4 mm thickness of the glass plate being 1.3 or more,

an ultraviolet transmittance Tuv as defined in ISO 9050 (2003) being 50% or less as a value calculated as 4 mm thickness of the glass plate,

a dominant wavelength Dw as defined in JIS Z 8701 (1999) of 400 to 550 nm, as a value calculated as 4 mm thickness of the glass plate, and

an excitation purity Pe as defined in JIS Z 8701 (1999) being 3% or less as a value calculated as 4 mm thickness of the glass plate.

2. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxides:

SiO 2

65 to 80%,

Al 2 O 3

 0 to 6%,

MgO

 0 to 10%,

CaO

 5 to 12%,

Na 2 O

 5 to 18%, and

K 2 O

 0 to 5%.

3. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

total iron calculated as Fe 2 O 3 : 0.05 to 0.32%.

4. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

total cerium as calculated as CeO 2 : 0.01 to 0.60%.

5. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises substantially no coloring component except for iron, selenium, cobalt, and TiO 2 .

6. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises substantially no TiO 2 .

7. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , further comprising, as represented by mass percentage based on oxides:

CoO: 0.00005 to 0.0030%.

8. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

CoO: 0.00027 to 0.002%.

9. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

CoO: 0.00057 to 0.002%.

10. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

Se: 0.00035 to 0.0010%.

11. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

total sulfur calculated as SO 3 : 0.018% to 0.1%.

12. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

total sulfur calculated as SO 3 : 0.021% to 0.1%.

13. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , wherein the soda lime glass comprises, as represented by mass percentage based on oxide:

total sulfur calculated as SO 3 : 0.003 to 0.05%.

14. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , having a mass proportion of divalent iron calculated as Fe 2 O 3 to total iron calculated as Fe 2 O 3 being 57% or more.

15. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , satisfying a mass ratio (SnO 2 /SO 3 ) of the content of the total tin calculated as SnO 2 to the content of the total sulfur calculated as SO 3 being from 0.2 to 100.

16. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , satisfying a ratio ((SnO 2 /SO 3 )/Fe-redox) of the mass ratio (SnO 2 /SO 3 ) of the content of the total tin calculated as SnO 2 to the content of the total sulfur calculated as SO 3 to the mass proportion (Fe-redox) of divalent iron calculated as Fe 2 O 3 to the total iron calculated as Fe 2 O 3 being from 0.0025 to 5.

17. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , satisfying the following N value being 0 or more:

N value=(mass of divalent iron calculated as Fe 2 O 3 )−40×(total iron calculated as Fe 2 O 3 )−6×(total tin calculated as SnO 2 )+5×(total sulfur calculated as SO 3 )+(total cerium calculated as CeO 2 )+14,

provided that the mass of divalent iron calculated as Fe 2 O 3 is a product of Fe-redox and the total iron calculated as Fe 2 O 3 .

18. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , having a* value and b* value as defined in JIS Z 8781 (1999) satisfying: −10≤a*≤2 and −4≤b*≤6, as values calculated as 4 mm thickness of the glass plate.

19. The heat-ray- and ultraviolet-absorbing glass plate according to claim 1 , having a Tv/Te of 1.49 or more.

20. A method for producing a heat-ray- and ultraviolet-absorbing glass plate, comprising:

preparing a glass raw material to be the following glass composition;

melting the raw material at 1,400° C. to 1,550° C. in a melting furnace to form molten glass; and

forming the molten glass into a glass plate by a plate glass-forming apparatus, to thereby obtain a glass plate having:

a mass proportion of divalent iron calculated as Fe 2 O 3 to total iron calculated as Fe 2 O 3 being 50% or more,

a visible light transmittance Tv (illuminant A, 2° visual field) as defined in JIS R 3106 (1998) being 66% or more as a value calculated as 4 mm thickness of the glass plate,

a solar transmittance Te as defined in JIS R 3106 (1998) being 65% or less as a value calculated as 4 mm thickness of the glass plate,

a ratio Tv/Te of the visible light transmittance Tv (illuminant A, 2° visual field) as defined in JIS R 3106 (1998) as a value calculated as 4 mm thickness of the glass plate to the solar transmittance Te as defined in JIS R 3106 (1998) as a value calculated as 4 mm thickness of the glass plate being 1.3 or more, and

a ultraviolet transmittance Tuv as defined in ISO 9050 (2003) being 50% or less as a value calculated as 4 mm thickness of the glass plate,

a dominant wavelength Dw as defined in JIS Z 8701 (1999) of 400 to 550 nm, as a value calculated as 4 mm thickness of the glass plate, and

an excitation purity Pe as defined in JIS Z 8701 (1999) being 3% or less as a value calculated as 4 mm thickness of the glass plate,

the glass plate comprising a soda lime glass comprising, as represented by mass percentage based on oxides,

total iron calculated as Fe 2 O 3

 0.05 to 0.3%,

total tin calculated as SnO 2

 0.02 to 0.5%,

total cerium calculated as CeO 2

 0.01 to 2.9%,

total sulfur calculated as SO 3

 0.003 to 0.1%, and

Se

0.0001 to 0.0050%.