Infrared absorbent green glass composition and laminated glass including the same

• US 20060217257A1
• Filed: 03/15/2006
• Published: 09/28/2006
• Est. Priority Date: 03/22/2005
• Status: Active Grant

• Current Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Inventors: Nagashima, Yukihito, Murakami, Harunori
• Granted Patent: US 7,632,767 B2
• Time in Patent Office: Days
• US Class Current: 501/70
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 4/02 for coloured glass
• CPC Class Codes: C03C 4/082 for infrared absorbing glass

Abstract

A glass composition that has improved infrared absorptivity while preventing the visible light transmittance from decreasing excessively. The glass composition includes: the following components, expressed in mass %: 65<SiO₂≦75; 0≦B₂O₃≦5; 0≦Al₂O₃≦5; 0≦MgO<2; 10<CaO≦15; 0≦SrO≦10; 0≦BaO≦10; 0≦Li₂O≦5; 10≦Na₂O≦15; 0≦K₂0≦5; and 0≦TiO₂≦0.5, where 10<MgO+CaO+SrO+BaO≦20 and 10≦Na₂O+K₂O≦17.5; MnO 0 to 300 mass ppm; and the following components as colorants, expressed in mass %: 0.4≦T—Fe₂O₃≦1.0, where T—Fe₂O₃ is total iron oxide expressed as Fe₂O₃; and 0≦CeO₂≦2.0. The mass ratio of FeO expressed as Fe₂O₃ to T—Fe₂O₃ is 20 to 44%. The wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm. The transmittance that is obtained at a wavelength of 1650 nm is not higher than the transmittance that is obtained at a wavelength of 730 nm.

Claims

1. An infrared absorbent green glass composition, comprising:

the following components, expressed in mass %;

65<

SiO₂≦

75;

0≦

B₂O₃≦

5;

0≦

Al₂O₃≦

5;

0≦

MgO<

2;

10<

CaO≦

15;

0≦

SrO≦

10;

0≦

BaO≦

10;

0≦

Li₂O≦

5;

10≦

Na₂O≦

15;

0≦

K₂O≦

5; and

0≦

TiO₂≦

0.5,

where 10<

MgO+CaO+SrO+BaO≦

20 and 10≦

Na₂O+K₂O≦

17.5;

the following component, expressed in mass ppm;

MnO 0 to 300 ppm; and

the following components as colorants, expressed in mass %;

0.4≦

T—

Fe₂O₃≦

1.0,

where T—

Fe₂O₃ is total iron oxide expressed as Fe₂O₃; and

0≦

CeO₂≦

2.0,

wherein a mass ratio of FeO expressed as Fe₂O₃ to T—

Fe₂O₃ (FeO/T—

Fe₂O₃) is 20 to 44%,

a wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm, and

a transmittance that is obtained at a wavelength of 1650 nm is not higher than a transmittance that is obtained at a wavelength of 730 nm.

2. The infrared absorbent green glass composition according to claim 1, wherein a mass ratio of CaO to MgO (CaO/MgO) is at least 7.5.

3. The infrared absorbent green glass composition according to claim 2, wherein the mass ratio (CaO/MgO) is at least 30.

4. The infrared absorbent green glass composition according to claim 1, wherein the range of MgO, expressed in mass %, is:

0≦

MgO≦

1.5.

5. The infrared absorbent green glass composition according to claim 4, wherein the range of MgO, expressed in mass %, is:

0≦

MgO≦

0.75.

6. The infrared absorbent green glass composition according to claim 1, wherein the range of CaO, expressed in mass %, is:

11≦

CaO≦

15.

7. The infrared absorbent green glass composition according to claim 1, wherein the range of SiO₂, expressed in mass %, is:

66.5≦

SiO₂<

69.

8. The infrared absorbent green glass composition according to claim 1, wherein the ranges of Na₂O and Na₂O+K₂O, expressed in mass %, are:

10≦

Na₂O<

14.5; and

11.5≦

Na₂O+K₂O≦

15.

9. The infrared absorbent green glass composition according to claim 1, wherein the range of T—

Fe₂O₃, expressed in mass %, is;

0.65<

T—

Fe₂O₃≦

1.0.

10. The infrared absorbent green glass composition according to claim 1, wherein the range of CeO₂, expressed in mass %, is:

0.1≦

CeO₂≦

1.5.

11. The infrared absorbent green glass composition according to claim 10, wherein the range of CeO₂, expressed in mass %, is:

0.1≦

CeO₂≦

1.0.

12. The infrared absorbent green glass composition according to claim 1, comprising MnO.

13. The infrared absorbent green glass composition according to claim 1, wherein the infrared absorbent green glass composition is formed into a sheet shape with a thickness of at least 1.3 mm but less than 2.5 mm, and

the infrared absorbent green glass composition has a visible light transmittance (Y_A) of at least 80%, which is measured with the illuminant A, and a total solar energy transmittance (T_G) of 62% or lower.

14. The infrared absorbent green glass composition according to claim 1, wherein the infrared absorbent green glass composition is formed into a sheet shape with a thickness between 2.5 mm and 6 mm, and

the infrared absorbent green glass composition has a visible light transmittance (Y_A) of at least 70%, which is measured with the illuminant A, a total solar energy transmittance (T_G) of 55% or lower, and an ultraviolet transmittance (T_UV) of 15% or lower.

15. A laminated glass, comprising at least two glass sheets that are bonded to each other, with a thermoplastic resin layer being interposed therebetween,

wherein at least one selected from the at least two glass sheets is formed of an infrared absorbent green glass composition according to claim 1.

16. The laminated glass according to claim 15, wherein the at least two glass sheets are formed of an infrared absorbent green glass composition according to claim 1.

17. The laminated glass according to claim 15, wherein the laminated glass has a visible light transmittance (Y_A) of at least 70%, which is measured with the illuminant A, and a total solar energy transmittance (T_G) of 45% or lower.