Ultraviolet-absorbing glass article

Patent metadata

Field	Value
Publication number	US-10427971-B2
Application number	US-201815949211-A
Country	US
Kind code	B2
Filing date	Apr 10, 2018
Priority date	Oct 16, 2015
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

Disclosed is an ultraviolet-absorbing glass article comprising a glass matrix composition including, in mass % in terms of oxide contents, 66-75% SiO2, 10-20% Na2O, 5-15% CaO, 0-6% MgO, 0-5% Al2O3, 0-5% K2O, at least 0.8% to less than 2.4% total iron content in terms of Fe2O3 (t-Fe2O3), 0-0.01% Cr2O3, 0.02-0.04% CoO, 0.0005-0.0045% Se, and greater than 0% to at most 1% TiO2, wherein: the amount of redox is from 20% to 30% inclusive; redox, t-Fe2O3, and TiO2 satisfy a predetermined relationship; and t-Fe2O3, Cr2O3, CoO, and Se satisfy a predetermined relationship.

First claim

The invention claimed is:

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.

Assignees

• Agc Inc

Inventors

• Akada Shuichi
• Watanabe Soshi

Classifications

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• B60J1/18

  arranged at the vehicle rear {(optical viewing arrangements integrated in rear windows, e.g. Fresnel lenses B60R1/001)} · CPC title

• B60J1/08

  arranged at vehicle sides · CPC title

• C03C4/085

  for ultraviolet absorbing glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title