Glass composition, glass sheet, and vehicle window including glass sheet

1. An ultraviolet-shielding glass sheet comprising a glass composition based on soda-lime glass, the glass composition comprising iron oxide and TiO 2 as coloring components, wherein

the glass sheet has a thickness of 1 to 5 mm, and

at the thickness, an ultraviolet transmittance (Tuv 380) as determined according to ISO 9050:1990 is 1.5% or less,

an ultraviolet transmittance (Tuv 400) as determined according to ISO 13837:2008 convention A is 2.0% or less,

a visible transmittance (YA) as measured using CIE standard illuminant A according to JIS R 3106:1998 at the thickness of 3.5 mm is 26.1 to 40%, and a solar transmittance (TG) as measured according to JIS R 3106:1998 is 10 to 45%,

wherein the glass composition comprises, as base composition:

65 to 85 wt % SiO 2 ;

0 to 5 wt % B 2 O 3 ;

0 to 5 wt % Al 2 O 3 ;

0 to 20 wt % MgO;

0 to 20 wt % CaO;

10 to 20 wt % Na 2 O;

0 to 5 wt % K 2 O; and

0 to 0.5 wt % SO 3 ,

the glass composition comprises, as coloring components:

0.9 to 2.2 wt % TiO 2 ;

more than 2.4 wt % and 3.0 wt % or less T-Fe 2 O 3 , where T-Fe 2 O 3 represents total iron oxide calculated as Fe 2 O 3 ; and

50 to 95 wt. ppm cobalt oxide (CoO) calculated as CoO;

the glass composition is substantially free of NiO, and

the total content of T-Fe 2 O 3 , TiO 2 , and CeO 2 is more than 4.0% and 6.0% or less.

2. The ultraviolet-shielding glass sheet according to claim 1 , wherein the base composition of the glass composition includes:

65 to 71 wt % SiO 2 ;

0 to 5 wt % B 2 O 3 ;

1 to 3 wt % Al 2 O 3 ;

3 to 10 wt % MgO;

5 to 15 wt % CaO;

10 to 15 wt % Na 2 O;

0.5 to 2 wt % K 2 O; and

0 to 0.5 wt % SO 3 .

3. The ultraviolet-shielding glass sheet according to claim 1 , wherein the coloring components of the glass composition comprise:

1.0 to 2.2 wt % TiO 2 ;

more than 2.4 wt % and 3.0 wt % or less T-Fe 2 O 3 , where T-Fe 2 O 3 represents total iron oxide calculated as Fe 2 O 3 ; and

50 to 95 wt. ppm cobalt oxide (CoO) calculated as CoO.

4. The ultraviolet-shielding glass sheet according to claim 3 , wherein the coloring components of the glass composition consist essentially of:

1.3 to 2.1 wt % TiO 2 ;

50 to 95 wt. ppm cobalt oxide (CoO) calculated as CoO;

0 wt. ppm NiO; and

0 to 2 wt. ppm Se.

5. The ultraviolet-shielding glass sheet according to claim 4 , wherein the coloring components of the glass composition consist of:

1.5 to 2.1 wt % TiO 2 ;

more than 2.4 wt % and 2.9 wt % or less T-Fe 2 O 3 , where T-Fe 2 O 3 represents total iron oxide calculated as Fe 2 O 3 ;

70 to 95 wt. ppm cobalt oxide (CoO) calculated as CoO;

0 wt. ppm NiO; and

0 to 2 wt. ppm Se.

6. The ultraviolet-shielding glass sheet according to claim 3 , wherein the coloring components of the glass composition, as calculated per cm 2 of the glass sheet, include:

3 to 25 mg TiO 2 ;

10 to 25 mg T-Fe 2 O 3 , where T-Fe 2 O 3 represents total iron oxide calculated as Fe 2 O 3 ; and

40 to 140 μg cobalt oxide (CoO) calculated as CoO.

7. A strengthened glass sheet having a thickness of 1.0 to 3.5 mm, the strengthened glass sheet being obtained by thermally tempering the glass sheet according to claim 6 .

8. A laminated glass sheet comprising a first glass sheet, an interlayer for glass lamination, and a second glass sheet, wherein

at least one of the first and second glass sheets is the ultraviolet-shielding glass sheet according to claim 6 .

9. A vehicle window pane comprising the strengthened glass sheet according to claim 7 .

10. A vehicle window comprising the window pane according to claim 9 , wherein when air mass 1.5 sunlight as defined in JIS C 8904:2011 is applied to the vehicle window from outside of a vehicle, an ultraviolet intensity inside of the vehicle within a wavelength range up to 400 nm is 0.45 J·s −1 ·m −2 or less.

11. A vehicle window pane comprising the laminated glass sheet according to claim 8 .

12. A vehicle window comprising the window pane according to claim 11 , wherein when air mass 1.5 sunlight as defined in JIS C 8904:2011 is applied to the vehicle window from outside of a vehicle, an ultraviolet intensity inside of the vehicle within a wavelength range up to 400 nm is 0.45 J·s −1 ·m −2 or less.

13. The ultraviolet-shielding glass sheet according to claim 1 , wherein the coloring components of the glass composition comprise:

0.9 to 2.2 wt % TiO 2 ;

more than 2.4 wt % and 3.0 wt % or less T-Fe 2 O 3 , where T-Fe 2 O 3 represents total iron oxide calculated as Fe 2 O 3 ;

50 to 95 wt. ppm cobalt oxide (CoO) calculated as CoO;

0 wt. ppm NiO; and

0 wt. ppm Se.