Ultraviolet ray absorbent colored glass

• US 5,558,942 A
• Filed: 11/10/1994
• Issued: 09/24/1996
• Est. Priority Date: 11/12/1993
• Status: Expired due to Term

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Itoh, Mizuki, Kijima, Takashi
• Primary Examiner(s): Krynski, William A.
• Application Number:
  US08/338,800
• Time in Patent Office: 684 Days
• Field of Search: 428/192,195, 428/212, 428/411.1, 428/426, 428/688, 428/446, 501/55, 501/68, 501/69, 501/70, 501/71, 501/72
• US Class Current: 428/426
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 4/02 for coloured glass
• CPC Class Codes: C03C 4/085 for ultraviolet absorbing glass
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

Ultraviolet ray absorbent colored glass for buildings and vehicles, which consists essentially of from 65 to 75 wt % of SiO₂, from 0.1 to 5.0 wt % of Al₂ O₃ , from 10 to 18 wt % of Na₂ O, from 0 to 5 wt % of K₂ O, from 5 to 15 wt % of CaO, from 1 to 6 wt % of MgO, from 0.05 to 1.0 wt % of SO₃, from 0.08 to 0.20 wt % of vanadium as calculated as V₂ O₅, from 0.36 to 0.65 wt % of MnO₂, from 0 to 0.0020 wt % of CoO and from 0.06 to 0.18 wt % of iron as calculated as Fe₂ O₃, wherein from 0 to 10 wt % of the total iron content is FeO.

Claims

1. Ultraviolet ray absorbent colored glass for buildings and vehicles, which consists essentially of from 65 to 75 wt % of SiO₂, from 0.1 to 5.0 wt % of Al₂ O₃, from 10 to 18 wt % of Na₂ O, from 0 to 5 wt % of K₂ O, from 5 to 15 wt % of CaO, from 1 to 6 wt % of MgO, from 0.05 to 1.0 wt % of SO₃, from 0.08 to 0.20 wt % of vanadium as calculated as V₂ O₅, from 0.36 to 0.65 wt % of MnO₂, from 0 to 0.0020 wt % of CoO and from 0.06 to 0.18 wt % of iron as calculated as Fe₂ O₃, wherein from 0 to 10 wt % of the total iron content is FeO.

2. The ultraviolet ray absorbent colored glass according to claim 1, which has a brown color, whereby the Illuminant C dominant wavelength is from 574 to 581 nm, and the excitation purity is from 4 to 6%.

3. The ultraviolet ray absorbent colored glass having a brown color according to claim 2, which has, in a thickness of from 3 to 5 mm, a luminous transmittance of Illuminant A of at least 70% and an ultraviolet ray transmittance of at most 15%.

4. The ultraviolet ray absorbent colored glass having a brown color according to claim 3, which has, in a thickness of from 3 to 5 mm, a transmittance of 350 nm of at most 10%.