US 10,427,971 B2
Ultraviolet-absorbing glass article
Shuichi Akada, Tokyo (JP); and Soshi Watanabe, Tokyo (JP)
Assigned to AGC Inc., Chiyoda-ku (JP)
Filed by AGC Inc., Chiyoda-ku (JP)
Filed on Apr. 10, 2018, as Appl. No. 15/949,211.
Application 15/949,211 is a continuation of application No. PCT/JP2016/080216, filed on Oct. 12, 2016.
Claims priority of application No. 2015-204306 (JP), filed on Oct. 16, 2015.
Prior Publication US 2018/0222788 A1, Aug. 9, 2018
Int. Cl. C03C 3/087 (2006.01); C03C 4/08 (2006.01); B60J 1/08 (2006.01); B60J 1/18 (2006.01)
CPC C03C 3/087 (2013.01) [C03C 4/085 (2013.01); B60J 1/08 (2013.01); B60J 1/18 (2013.01); C03C 2204/00 (2013.01)] 9 Claims
 
1. An ultraviolet absorbing glass article comprising, in terms of % by mass based on oxides:
SiO2 66 to 75%,
Na2O 10 to 20%,
CaO 5 to 15%,
MgO 0 to 6%,
Al2O3 0 to 5%,
K2O 0 to 5%,
total iron (t-Fe2O3) as represented by Fe2O3 0.8% or more and less than 2.4%,
Cr2O3 0 to 0.01%,
CoO 0.02 to 0.04%,
Se 0.0005 to 0.0045%, and
TiO2 more than 0% and 1% or less,
a Redox, which is (an content of divalent iron (Fe2+) in terms of Fe2O3)/(a total content of divalent iron (Fe2+) in terms of Fe2O3 and trivalent iron (Fe2+) in terms of Fe2O3), being 20% or more and 30% or less,
the Redox, and the contents of t-Fe2O3 and TiO2 satisfying expression (1),
the contents of t-Fe2O3, Cr2O3, 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-Fe2O3)+0.48×(TiO2)≥1.73  (1), and
5.0≤(t-Fe2O3)+10×(Cr2O3)+90×(CoO)+1100×(Se)≤8  (2).