Composition for colored glass intended for the manufacture of glazing panes

• US 5,985,780 A
• Filed: 06/07/1995
• Issued: 11/16/1999
• Est. Priority Date: 10/03/1991
• Status: Expired due to Fees

• Current Assignee: Saint-Gobain Vitrage International
• Original Assignee: Saint-Gobain Vitrage International
• Inventors: Alvarez Casariego, Pedro, Massol, Jean-Jacques
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US08/487,392
• Time in Patent Office: 1,623 Days
• Field of Search: 501/69, 501/70, 501/71, 501/905
• 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 4/02 for coloured glass
• CPC Class Codes: Y10S 501/905 Ultraviolet transmitting or absorbing

Abstract

A colored glass composition, containing the following oxides within the following limits by weight:

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SiO₂ 64 to 75% Al₂ O₃ 0 to 5% B₂ O₃ 0 to 5% CaO 5 to 15% MgO 0 to 5% Na₂ O 10 to 18% and K₂ O 0 to 5% ______________________________________

and as coloring agents:______________________________________Fe₂ O₃ (total iron) 0.45 to 2.5% with FeO content representing from 16 to 55%______________________________________

of the total iron content expressed in the form of Fe₂ O₃______________________________________ CoO 0.001 to 0.02% Se 0 to 0.0009%______________________________________

wherein the glasses have a total energy transmission factor (T_E) less than the light transmission factor under illuminant A (TL_A), the factor T_E being from 10 to 48% and the factor TL_A from 20 to 60% for a thickness of 3.85 mm, the colored glass composition having an excitation purity equal to or less than 7.6%.

Claims

1. A colored glass composition, comprising the following oxides within the following limits by weight:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 64 to 75% Al.sub.2 O.sub.3 0 to 5% B.sub.2 O.sub.3 0 to 5% CaO 5 to 15% MgO 0 to 5% Na.sub.2 O 10 to 18% K.sub.2 O 0 to 5% ______________________________________

and as coloring agents;

space="preserve" listing-type="tabular">______________________________________ Fe.sub.2 O.sub.3 (total iron) 0.45 to 2.5% with FeO content representing from 16 to 55% ______________________________________

of the total iron content expressed in the form of Fe₂ O₃

space="preserve" listing-type="tabular">______________________________________ CoO 0.001 to 0.02% Se 0 to 0.0009% ______________________________________

wherein the glasses have a total energy transmission factor (T_E) less than the light transmission factor under illuminant A (TL_A), the factor T_E being from 10 to 48% and the factor TL_A from 20 to 60% for a thickness of 3.85 mm, said colored glass composition having an excitation purity equal to or less than 7.6%.

2. The composition according to claim 1, wherein the FeO content represents from 20 to 40% of the total iron expressed in the form of Fe₂ O₃.

3. The composition according to claim 1, wherein said coloring agents are:

space="preserve" listing-type="tabular">______________________________________ Fe.sub.2 O.sub.3 (total iron) 0.45 to 1% CoO 0.001 to 0.01% Se 0.0002 to 0.0009%. ______________________________________

4. The composition according to claim 1, wherein said coloring agents are:

space="preserve" listing-type="tabular">______________________________________ Fe.sub.2 O.sub.3 (total iron) 1 to 1.8% CoO 0.005 to 0.02% Se 0.0005 to 0.0009%. ______________________________________

5. The composition according to claim 1, wherein said coloring agents are:

space="preserve" listing-type="tabular">______________________________________ Fe.sub.2 O.sub.3 (total iron) 0.8 to 1.8% CoO 0.001 to 0.01%. ______________________________________

6. The composition according to claim 1, wherein said coloring agents are:

space="preserve" listing-type="tabular">______________________________________ Fe.sub.2 O.sub.3 (total iron) 1.3 to 2.5% CoO 0.005 to 0.015%. ______________________________________

7. The composition according to claim 1, wherein said CoO is used in an amount of 0.001 to 0.0099%.

8. A glazing pane comprising a colored glass sheet, wherein the colored glass sheet has a composition as claimed in claim 1 and has a thickness of from 2 to 8 mm.

9. A glazing set mounted on an automobile vehicle, comprising a windscreen, front side windows and rear side windows and a rear window, wherein the rear side windows, both movable and fixed, and the rear window comprise panes as claimed in claim 8.

10. The glazing set according to claim 9, wherein the rear side windows and the rear window comprise, respectively, panes which, for a given thickness, have different total light transmission factors under illuminant A.

11. The glazing set according to claim 9, wherein the panes forming the rear side windows have, for a thickness of 3.85 mm, a total transmission factor under illuminant A of from 30 to 60%, and the pane forming the rear window has, for the same thickness, a total transmission factor under illuminant A of from 20 to 45%.