Colored glass plate and method for its production
View Patent ↗To provide a colored glass plate which, despite containing substantially no expensive cerium, simultaneously satisfies low solar transmittance, high visible light transmittance and low UV transmittance, while transmitted light has a green color tone. The colored glass plate comprises, as represented by mass percentage based on oxides, SiO 2 : from 65 to 75%, Al 2 O 3 : from 0 to 6%, MgO: from 2 to 6%, CaO: from 5 to 15%, total iron calculated as Fe 2 O 3 : from 0.3 to 1.2%, total titanium calculated as TiO 2 : from 0.2 to 1.1%, and total vanadium calculated as V 2 O 5 : from 0.02 to 0.3%, and contains substantially no cerium, cobalt, chromium or manganese.
1. A colored glass plate comprising, as represented by mass percentage based on oxides:
SiO 2 : from 65 to 75%,
Al 2 O 3 : from 0 to 6%,
MgO: from 2 to 6%,
CaO: from 5 to 15%,
total iron calculated as Fe 2 O 3 : from 0.5 to 1.2%,
total titanium calculated as TiO 2 : from 0.2 to 1.1%, and
total vanadium calculated as V 2 O 5 : from 0.02 to 0.3%,
wherein said colored glass plate comprises substantially no cerium, cobalt, chromium or manganese and has:
a solar transmittance as stipulated in JIS R3106 (1998) of at most 55% as a value calculated in a thickness of 4 mm,
a visible light transmittance (illuminant A, 2 degrees field of vision) as stipulated in JIS R3106 (1998) of at least 70% as a value calculated in a thickness of 4 mm,
an UV transmittance as stipulated in ISO-9050 of at most 12% as a value calculated in a thickness of 4 mm, and
a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 540 to 570 nm.
2. The colored glass plate according to claim 1 , which further comprises, as represented by mass percentage based on oxide, from 5 to 18% of Na 2 O.
3. The colored glass plate according to claim 1 , which has a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 552 to 556 nm.
4. The colored glass plate according to claim 1 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 68 to 73%,
Al 2 O 3 : from 0.5 to 3.5%,
MgO: from 2.5 to 5%,
CaO: from 6 to 11%,
Na 2 O+K 2 O: from 10 to 18%,
total iron calculated as Fe 2 O 3 : from 0.5 to 0.9%,
total titanium calculated as TiO 2 : from 0.5 to 1.0%, and
total vanadium calculated as V 2 O 5 : from 0.05 to 0.20%.
5. The colored glass plate according to claim 1 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 70 to 72%,
Al 2 O 3 : from 1.5 to 2.0%,
MgO: from 3 to 4%,
CaO: from 7 to 9%,
Na 2 O+K 2 O: from 11 to 16%,
total iron calculated as Fe 2 O 3 : from 0.6 to 0.7%, total titanium calculated as TiO 2 : from 0.7 to 0.9%, and
total vanadium calculated as V 2 O 5 : from 0.10 to 0.15%.
6. The colored glass plate according to claim 1 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.05% as represented by mass percentage.
7. The method according to claim 1 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.01% as represented by mass percentage.
8. The method according to claim 1 , wherein the colored glass plate comprises no cerium, cobalt, chromium or manganese.
9. The colored glass plate according to claim 1 , which has
a solar transmittance as stipulated in JIS R3106 (1998) of at most 50% as a value calculated in a thickness of 4 mm,
a visible light transmittance (illuminant A, 2 degrees field of vision) as stipulated in JIS R3106 (1998) of at least 71.5% as a value calculated in a thickness of 4 mm,
an UV transmittance as stipulated in ISO-9050 of at most 10% as a value calculated in a thickness of 4 mm, and
a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 550 to 560 nm.
10. The colored glass plate according to claim 9 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 68 to 73%,
Al 2 O 3 : from 0.5 to 3.5%,
MgO: from 2.5 to 5%,
CaO: from 6 to 11%,
Na 2 O+K 2 O: from 10 to 18%,
total iron calculated as Fe 2 O 3 : from 0.5 to 0.9%,
total titanium calculated as TiO 2 : from 0.5 to 1.0%, and
total vanadium calculated as V 2 O 5 : from 0.05 to 0.20%.
11. The colored glass plate according to claim 10 , which has a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 552 to 556 nm.
12. The colored glass plate according to claim 9 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 70 to 72%,
Al 2 O 3 : from 1.5 to 2.0%,
MgO: from 3 to 4%,
CaO: from 7 to 9%,
Na 2 O+K 2 O: from 11 to 16%,
total iron calculated as Fe 2 O 3 : from 0.6 to 0.7%,
total titanium calculated as TiO 2 : from 0.7 to 0.9%, and
total vanadium calculated as V 2 O 5 : from 0.10 to 0.15%.
13. The colored glass plate according to claim 12 , which has a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 552 to 556 nm.
14. The colored glass plate according to claim 13 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.05% as represented by mass percentage.
15. The method according to claim 13 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.01% as represented by mass percentage.
16. The method according to claim 13 , wherein the colored glass plate comprises no cerium, cobalt, chromium or manganese.
17. A method for producing a colored glass plate, which comprises melting glass raw materials, followed by forming to obtain a colored glass plate comprising, as compositional components of the glass plate after the forming and as represented by mass percentage based on oxides:
SiO 2 : from 65 to 75%,
Al 2 O 3 : from 0 to 6%,
MgO: from 2 to 6%,
CaO: from 5 to 15%,
total iron calculated as Fe 2 O 3 : from 0.5 to 1.2%,
total titanium calculated as TiO 2 : from 0.2 to 1.1%, and
total vanadium calculated as V 2 O 5 : from 0.02 to 0.3%,
wherein said colored glass plate comprises substantially no cerium, cobalt, chromium or manganese and has:
a solar transmittance as stipulated in JIS R3106 (1998) of at most 55% as a value calculated in a thickness of 4 mm,
a visible light transmittance (illuminant A, 2 degrees field of vision) as stipulated in JIS R3106 (1998) of at least 70% as a value calculated in a thickness of 4 mm,
an UV transmittance as stipulated in ISO-9050 of at most 12% as a value calculated in a thickness of 4 mm, and
a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 540 to 570 nm.
18. The method for producing a colored glass plate according to claim 17 , wherein the glass plate further contains, as its compositional component and as represented by mass percentage based on oxide, from 5 to 18% of Na 2 O.
19. The method for producing a colored glass plate according to claim 17 , wherein the colored glass plate has
a solar transmittance as stipulated in JIS R3106 (1998) of at most 50% as a value calculated in a thickness of 4 mm,
a visible light transmittance (illuminant A, 2 degrees field of vision) as stipulated in JIS R3106 (1998) of at least 71.5% as a value calculated in a thickness of 4 mm,
an UV transmittance as stipulated in ISO-9050 of at most 10% as a value calculated in a thickness of 4 mm, and
a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 550 to 560 nm.