Ultraviolet-absorbent glass

Patent metadata

Field	Value
Publication number	US-10577276-B2
Application number	US-201816033646-A
Country	US
Kind code	B2
Filing date	Jul 12, 2018
Priority date	Jan 20, 2016
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

The purpose of the present invention is to provide an ultraviolet-absorbent glass that is suitable as a dark gray glass, that has a very low ultraviolet transmittance (TUV), and that has excellent color rendering properties for green. The present invention relates to an ultraviolet-absorbent glass in which: the ultraviolet transmittance (TUV) as defined in ISO 9050:2003 is 2% or less for a thickness of 2.8 mm; the visible light transmittance (TVA) based on a standard A light source is 10% to 30% inclusive for a thickness of 2.8 mm; the energy transmittance (TE) as defined in JIS R 3106:1998 is 30% or less for a thickness of 2.8 mm; a ratio R14/R9 for color rendering indices as defined in ISO 9050:1990 and JIS Z 8726:1990 is 1.8 or greater; and a ratio R14/R1 is 1.05 or greater.

First claim

The invention claimed is:

1. An ultraviolet absorbing glass comprising, in 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%,

Fe 2 O 3
1.57 to 3.5%,

FeO
0.36 to 1%,

TiO 2
0.1 to 3.2%,

CoO
0.01 to 0.04%,

Se
0.005% or less,

Cr 2 O 3
0.08% or less, and

NiO
0.2% or less,

having a total iron content in terms of Fe 2 O 3 being from 2.68% to 4.61% in mass % based on oxides,
satisfying a Redox ([divalent iron (Fe 2+ ) in terms of Fe 2 O 3 ]/[total of divalent iron (Fe 2+ ) in terms of Fe 2 O 3 and trivalent iron (Fe 3+ ) in terms of Fe 2 O 3 ]) being 15 to 40%,
having an ultraviolet transmittance (TUV) specified by ISO 9050:2003 at a sheet thickness of 2.8 mm being 2% or less,
having a visible light transmittance (TVA) based on a Standard Illuminant A at a sheet thickness of 2.8 mm being 10% or more and 30% or less,
having an energy transmittance (TE) specified by JIS R3106:1998 at a sheet thickness of 2.8 mm being 30% or less, and
having a ratio R14/R9 of a color rendering index specified by ISO 9050:1990 and JIS Z8726:1990 being 1.8 or more and a ratio R14/R1 thereof being 1.05 or more.

2. The ultraviolet absorbing glass according to claim 1 , having the TiO 2 content being 0.8 to 3.2% in mass % based on oxides.

3. The ultraviolet absorbing glass according to claim 1 , having the CoO content being 0.01 to 0.038% in mass % based on oxides.

4. The ultraviolet absorbing glass according to claim 1 , having the CoO content being 0.018 to 0.04% in mass % based on oxides.

5. The ultraviolet absorbing glass according to claim 1 , having the Fe 2 O 3 content being 1.82 to 3.5% in mass % based on oxides.

6. The ultraviolet absorbing glass according to claim 1 , having the Fe 2 O 3 content being 2.06 to 3.5% in mass % based on oxides.

7. The ultraviolet absorbing glass according to claim 1 , having the FeO content being 0.40 to 1% in mass % based on oxides.

8. The ultraviolet absorbing glass according to claim 1 , satisfying AB being 1.8 or more and A/C being 1.05 or more, wherein:
the A indicates
−2.73[Fe 2 O 3 ]−5.19[FeO]−0.85[TiO 2 ]+9.94[NiO]+28.48[Cr 2 O 3 ]+231.19[CoO]−4169.28[Se]+913.24[TiO 2 ][Se]−1.71[Fe 2 O 3 ][TiO 2 ]+100.71;

the B indicates
24.88[Fe 2 O 3 ]−130.39[FeO]+21.54[TiO 2 ]−93.79[NiO]−782.99[Cr 2 O 3 ]−1402.05[CoO]+29997.75[Se]−4613.21[TiO 2 ][Se]−5.01[Fe 2 O 3 ][TiO 2 ]+60.53; and

the C indicates
6.07[Fe 2 O 3 ]−37.46[FeO]+2.55[TiO 2 ]−4.27[NiO]−183.6[Cr 2 O 3 ]−433.37[CoO]+6265.9[Se]−206.26[TiO 2 ][Se]−0.65[Fe 2 O 3 ][TiO 2 ]+91.92,

wherein an expression of a component surrounded by brackets shows a content (mass % based on oxides) of the component contained in the ultraviolet absorbing glass.

9. The ultraviolet absorbing glass according to claim 1 , having an ultraviolet transmittance (TUV400) specified by ISO 13837:2008 convention A at a sheet thickness of 2.8 mm being 5% or less.

10. The ultraviolet absorbing glass according to claim 1 , wherein the ultraviolet transmittance (TUV) specified by ISO 9050:2003 at a sheet thickness of 2.8 mm is 1% or less.

11. The ultraviolet absorbing glass according to claim 1 , wherein the visible light transmittance (TVA) based on the Standard Illuminant A at a sheet thickness of 2.8 mm is 12 to 28%.

12. The ultraviolet absorbing glass according to claim 1 , having a dominant wavelength (XD) specified by JIS Z8701:1999 at a sheet thickness of 2.8 mm being 500 nm or more.

Assignees

• Agc Inc

Inventors

• Akada Shuichi
• Watanabe Soshi

Classifications

• C03C3/087 Primary

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

• C03C4/085

  for ultraviolet absorbing glass · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03C4/08

  for glass selectively absorbing radiation of specified wave lengths · CPC title