Ultraviolet and infrared radiation absorbing green glass

• US 6,624,102 B2
• Filed: 09/17/2001
• Issued: 09/23/2003
• Est. Priority Date: 09/18/2000
• Status: Expired due to Fees

• Current Assignee: Nippon Sheet Glass Company Limited
• Original Assignee: Nippon Sheet Glass Company Limited
• Inventors: Seto, Hiromitsu, Nagashima, Yukihito, Yoshii, Shigekazu
• Primary Examiner(s): SAMPLE, DAVID R
• Application Number:
  US09/953,283
• Publication Number:
  US 20020058579A1
• Time in Patent Office: 736 Days
• Field of Search: 501/71
• US Class Current: 501/71
• 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
• CPC Class Codes: C03C 4/085 for ultraviolet absorbing glass

Abstract

An ultraviolet and infrared radiation absorbing green glass comprises: in % by weight, as coloring components, 0.5 to 1.1%, excluding 0.5%, total iron oxide in terms of Fe₂O₃; 0 to 2.0% CeO₂, 0 to 1.0% TiO₂; 0.0005 to 0.01% NiO; and 0.0001 to 0.001% CoO; wherein, when the glass has a thickness of 4 mm, the glass has a visible light transmittance of 70% or more, a total solar energy transmittance of 60% or less, and an ultraviolet transmittance defined by ISO 9050 of 25% or less.

Claims

1. An ultraviolet and infrared radiation absorbing green glass comprising:

in % by weight,

as coloring components,

0.5 to 1.1%, excluding 0.5%, total iron oxide in terms of Fe₂O₃ (T—

Fe₂O₃);

0.1 to 2.0% CeO₂

0 to 1.0% TiO₂

0.0005 to 0.01% NiO; and

0.0001 to 0.001% CoO;

wherein, when glass has a thickness of 4 mm, the glass has a visible light transmittance (YA) of 70% or more, a total solar energy transmittance (TG) of 60% or less, and an ultraviolet transmittance defined by ISO 9050 (Tuv) of 25% or less.

2. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, which comprises:

in % by weight,

as base glass components,

65 to 80% SiO₂;

0 to 5% Al₂O₃;

0 to 10% MgO;

5 to 15% CaO;

10 to 20% Na₂O;

0 to 5% K₂O; and

0 to 5% B₂O₃;

wherein the sum of MgO and CaO is 5 to 15% and the sum of Na₂O and K₂O is 10 to 20%.

3. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, wherein the content of the T—

Fe₂O₃ is from 0.6 to 1.1%, excluding 0.6%.

4. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, wherein FeO in terms of Fe₂O₃ accounts for 20 to 60% of the T—

Fe₂O₃.

5. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, which further comprises 0.0001 to 0.1% by weight in total of at least one selected from the group consisting of Se, Cr₂O₃, Mn₂O₃, CuO, Nd₂O₃, Er₂O₃, MoO₃, V₂O₅ and La₂O₃.

6. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, wherein, when the glass has a thickness of 4 mm, the glass has a visible light transmittance (YA) of 70% or more, a total solar energy transmittance (TG) of 53% or less, and an ultraviolet transmittance defined by ISO 9050 (Tuv) of 20% or less.

7. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, wherein the difference between the saturation of the glass before a heat treatment and that after the treatment is within 0.5, the saturation being determined from chromaticities a* and b* in the CIE 1976 L*a*b* color system using the following equation (1):

8. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 7, wherein the heat treatment is a heat-tempered treatment by air blast cooling.

9. The ultraviolet and infrared radiation absorbing green glass as claimed in claim 1, which is a sheet glass formed by a float process and has undergone a heat-tempered treatment.