Heat-absorbing glass plate and its production process
View Patent ↗To provide a heat-absorbing glass plate which comprises soda lime silica glass containing coloring components, the coloring components containing, as represented by mass % based on the following oxides, from 0.45 to 0.61% of total iron as calculated as Fe 2 O 3 and from 0.2 to 0.6% of TiO 2 , which contains substantially no CoO, Cr 2 O 3 , V 2 O 5 , MnO nor CeO 2 , which has a mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 of from 45 to 60%, which has a solar transmittance of at most 42% calculated as 4 mm thickness, which has a visible light transmittance (by illuminant A) of at least 70% calculated as 4 mm thickness, and which provides a transmitted light having a dominant wavelength of from 492 to 500 nm.
1. A heat-absorbing glass plate which comprises soda lime silica glass containing coloring components, the coloring components containing, as represented by mass % based on the following oxides, from 0.45 to 0.61% of total iron as calculated as Fe 2 O 3 and from 0.2 to 0.6% of TiO 2 ,
which contains substantially no CoO, Cr 2 O 3 , V 2 O 5 , MnO nor CeO 2 ,
which has a mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 of from 45 to 60%,
which has a solar transmittance of at most 42% calculated as 4 mm thickness as defined in JIS R3106 (1998),
which has a visible light transmittance (by illuminant A) of at least 70% calculated as 4 mm thickness as defined in JIS R3106 (1998), and
which provides a transmitted light having a dominant wavelength of from 492 to 500 nm as defined in JIS Z8701 (1982).
2. A heat-absorbing glass plate which comprises soda lime silica glass containing coloring components, the coloring components containing, as represented by mass % based on the following oxides, from 0.45 to 0.61% of total iron as calculated as Fe 2 O 3 and from 0.2 to 0.6% of TiO 2 ,
which contains substantially no cobalt oxide, chromium oxide, vanadium oxide, manganese oxide nor cerium oxide,
which has a mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 of from 45 to 60%,
which has a solar transmittance of at most 42% calculated as 4 mm thickness as defined in JIS R3106 (1998),
which has a visible light transmittance (by illuminant A) of at least 70% calculated as 4 mm thickness as defined in JIS R3106 (1998), and
which provides a transmitted light having a dominant wavelength of from 492 to 500 nm as defined in JIS Z8701 (1982).
3. The heat-absorbing glass plate according to claim 1 , which comprises soda lime silica glass having a composition substantially comprising, as represented by mass % based on the following oxides:
SiO 2 : 65˜75%,
Al 2 O 3 : 0.1˜5%,
Na 2 O+K 2 O: 10˜18%,
CaO: 5˜15%,
MgO: 2˜6%,
SnO 2 : 0˜0.5%,
SO 3 : 0˜1%,
total iron as calculated as Fe 2 O 3 : 0.45˜0.61%,
TiO 2 : 0.2˜0.6%.
4. The heat-absorbing glass plate according to claim 1 , wherein the content of total iron as calculated as Fe 2 O 3 is from 0.49 to 0.54% as represented by mass % based on oxides.
5. The heat-absorbing glass plate according to claim 1 , wherein the TiO 2 content is from 0.32 to 0.41% as represented by mass % based on oxides.
6. The heat-absorbing glass plate according to claim 1 , wherein the mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 is from 50 to 55%.
7. A process for producing a heat-absorbing glass plate, which comprises melting a glass raw material and forming the melt into a plate to produce soda lime silica glass containing coloring components, wherein
the coloring components of the glass after forming contain, as represented by mass % based on the following oxides, from 0.45 to 0.61% of total iron as calculated as Fe 2 O 3 and from 0.2 to 0.6% of TiO 2 ,
the heat-absorbing glass plate contains substantially no CoO, Cr 2 O 3 , V 2 O 5 , MnO nor CeO 2 , and
has a mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 of from 45 to 60%, and
the glass plate after forming has a solar transmittance of at most 42% calculated as 4 mm thickness as defined in JIS R3106 (1998),
has a visible light transmittance (by illuminant A) of at least 70% calculated as 4 mm thickness as defined in JIS R3106 (1998), and
provides a transmitted light having a dominant wavelength of from 492 to 500 nm as defined in JIS Z8701 (1982).
8. A process for producing a heat-absorbing glass plate, which comprises melting a glass raw material and forming the melt into a plate to produce soda lime silica glass containing coloring components, wherein
the coloring components of the glass after forming contain, as represented by mass % based on the following oxides, from 0.45 to 0.61% of total iron as calculated as Fe 2 O 3 and from 0.2 to 0.6% of TiO 2 ,
the heat-absorbing glass plate contains substantially no cobalt oxide, chromium oxide, vanadium oxide, manganese oxide nor cerium oxide, and
has a mass proportion of bivalent iron as calculated as Fe 2 O 3 in total iron as calculated as Fe 2 O 3 of from 45 to 60%, and
the glass plate after forming has a solar transmittance of at most 42% calculated as 4 mm thickness as defined in JIS R3106 (1998),
has a visible light transmittance (by illuminant A) of at least 70% calculated as 4 mm thickness as defined in JIS R3106 (1998), and
provides a transmitted light having a dominant wavelength of from 492 to 500 nm as defined in JIS Z8701 (1982).