Ultraviolet-absorbing glass article
View Patent ↗Disclosed is an ultraviolet-absorbing glass article comprising a glass matrix composition including, in mass % in terms of oxide contents, 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-6% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O, at least 0.8% to less than 2.4% total iron content in terms of Fe 2 O 3 (t-Fe 2 O 3 ), 0-0.01% Cr 2 O 3 , 0.02-0.04% CoO, 0.0005-0.0045% Se, and greater than 0% to at most 1% TiO 2 , wherein: the amount of redox is from 20% to 30% inclusive; redox, t-Fe 2 O 3 , and TiO 2 satisfy a predetermined relationship; and t-Fe 2 O 3 , Cr 2 O 3 , CoO, and Se satisfy a predetermined relationship.
1. An ultraviolet absorbing glass article comprising, in terms of % by mass based on oxides:
SiO 2 66 to 75%,
Na 2 O 10 to 20%,
CaO 5 to 15%,
MgO 0 to 6%,
Al 2 O 3 0 to 5%,
K 2 O 0 to 5%,
total iron (t-Fe 2 O 3 ) as represented by Fe 2 O 3 0.8% or more and less than 2.4%,
Cr 2 O 3 0 to 0.01%,
CoO 0.02 to 0.04%,
Se 0.0005 to 0.0045%, and
TiO 2 more than 0% and 1% or less,
a Redox, which is (an content of divalent iron (Fe 2+ ) in terms of Fe 2 O 3 )/(a total content of divalent iron (Fe 2+ ) in terms of Fe 2 O 3 and trivalent iron (Fe 2+ ) in terms of Fe 2 O 3 ), being 20% or more and 30% or less,
the Redox, and the contents of t-Fe 2 O 3 and TiO 2 satisfying expression (1),
the contents of t-Fe 2 O 3 , Cr 2 O 3 , CoO, and Se satisfying expression (2),
the ultraviolet absorbing glass article having:
an ultraviolet transmittance (TUV) (ISO 9050:2003) at a sheet thickness of 3.5 mm being 2% or less,
a visible light transmittance (TVA) (JIS R 3106 (1998)) measured by using a standard illuminant A at a sheet thickness of 3.5 mm being 12% or more and 25% or less,
a solar radiation transmittance (TE) (JIS R 3106 (1998)) at a sheet thickness of 3.5 mm being 22% or less, and
an excitation purity (Pe) measured by using a standard illuminant C at a sheet thickness of 3.5 mm being 10% or less:
1.77×(1−Redox/100)×( t -Fe 2 O 3 )+0.48×(TiO 2 )≥1.73 (1), and
5.0≤( t -Fe 2 O 3 )+10×(Cr 2 O 3 )+90×(CoO)+1100×(Se)≤8 (2).
2. The ultraviolet absorbing glass article according to claim 1 , wherein the content of TiO 2 is 0.1% or more and 1% or less.
3. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Cr 2 O 3 is 0% or more and 0.008% or less.
4. The ultraviolet absorbing glass article according to claim 1 , wherein the contents of t-Fe 2 O 3 , Cr 2 O 3 , CoO, and Se satisfies expression (2-1):
5.0≤( t -Fe 2 O 3 )+10×(Cr 2 O 3 )+90×(CoO)+1100×(Se)≤7.5 (2-1).
5. The ultraviolet absorbing glass article according to claim 1 , wherein a content of NiO is 0 to 0.05% by mass relative to a total amount of components of the glass composition.
6. The ultraviolet absorbing glass article according to claim 1 , wherein the ultraviolet absorbing glass comprises substantially no V 2 O 5 .
7. The ultraviolet absorbing glass article according to claim 1 , wherein the Redox is 20% or more and 27% or less.
8. The ultraviolet absorbing glass article according to claim 1 , wherein the Redox is 20% or more and 26% or less.
9. The ultraviolet absorbing glass article according to claim 1 , having an ultraviolet transmittance (TUV400) specified by ISO 13837:2008 convention A at a sheet thickness of 3.5 mm being 5% or less.