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: at least 0% and less than 2%, 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 0% to less than 2%,
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%,
and containing substantially no cerium, cobalt, chromium or manganese,
wherein said colored glass plate 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 is 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 solar transmittance as stipulated in JIS R3106 (1998) of at most 51% 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.
4. The colored glass plate according to claim 1 , wherein the content of cerium, cobalt, chromium and manganese is less than 0.05% as represented by mass percentage.
5. The colored glass plate according to claim 1 , wherein the content of cerium, cobalt, chromium and manganese is less than 0.01% as represented by mass percentage.
6. The colored glass plate according to claim 1 , comprising no cerium, cobalt, chromium or manganese.
7. The colored glass plate according to claim 1 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 67 to 72%,
Al 2 O 3 : from 1 to 5%,
MgO: from 0 to 1.0%,
CaO: from 6 to 10%,
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%.
8. The colored glass plate according to claim 1 , comprising, as represented by mass percentage based on oxides:
SiO 2 : from 69 to 71%,
Al 2 O 3 : from 2.5 to 4%,
MgO: from 0 to 0.5%,
CaO: from 7 to 8%,
Na 2 O+K 2 O: from 11 to 16%,
total iron calculated as Fe 2 O 3 : from 0.6 to 0.8%,
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%.
9. 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 0% to less than 2%,
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%,
and containing substantially no cerium, cobalt, chromium or manganese,
wherein said colored glass plate 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 is 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.
10. The method for producing a colored glass plate according to claim 9 , wherein the glass plate further comprises, as its compositional component and as represented by mass percentage based on oxide, from 5 to 18% of Na 2 O.
11. The method for producing a colored glass plate according to claim 9 , wherein the colored glass plate has
a solar transmittance as stipulated in JIS R3106 (1998) of at most 51% 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.
12. The method according to claim 11 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.05% as represented by mass percentage.
13. The method according to claim 11 , wherein the content of cerium, cobalt, chromium and manganese in the colored glass plate is less than 0.01% as represented by mass percentage.
14. The method according to claim 11 , wherein the colored glass plate comprises no cerium, cobalt, chromium or manganese.