Float glass substrate

Patent metadata

Field	Value
Publication number	US-12319615-B2
Application number	US-202217578650-A
Country	US
Kind code	B2
Filing date	Jan 19, 2022
Priority date	Jan 22, 2021
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

The present invention relates to a float glass substrate including an alkali-free glass, the float glass substrate having a Cl content of from 0.10 to 0.50 mass %, containing substantially no SnO 2 , and having a Pt content of, by mass, from 0.001 to 0.30 ppm. The float glass substrate may have a Rh content of, by mass, from 0.001 to 0.50 ppm.

First claim

What is claimed is:

1. A float glass substrate comprising an alkali-free glass, the float glass substrate having a Cl content of from 0.10 to 0.50 mass %, containing substantially no SnO 2 , having a Pt content of, by mass, from 0.001 to 0.30 ppm, having a Rh content of, by mass, from 0.001 to 0.50 ppm, having a β-OH of from 0.05 to 0.50 mm −1 and comprising, as represented by mass % based on oxides:
from 54 to 73% of SiO 2 ;
from 10.5 to 24% of Al 2 O 3 ;
from 0.1 to 12% of 8203;
from 0 to 8% of MgO;
from 0 to 14.5% of CaO;
from 0 to 24% of SrO;
from 0 to 13.5% of BaO; and
from 0 to 5% of ZrO 2 ,
provided that a total of MgO, CaO, SrO and BaO represented by MgO+CaQ+SrO+BaO is from 8 to 29.5%.

2. The float glass substrate according to claim 1 , having a total content of the Pt content and the Rh content of, by mass, from 0.002 to 0.80 ppm.

3. The float glass substrate according to claim 1 , comprising, as represented by mass % based on oxides:
from 58 to 66% of SiO 2 ;
from 15 to 22% of Al 2 O 3 ;
from 5 to 12% of B 2 O 3 ;
from 0 to 8% of MgO;
from 0 to 9% of CaO;
from 0 to 12.5% of SrO; and
from 0 to 2% of BaO,
provided that the total of MgO, CaO, SrO and BaO represented by MgO+CaO+SrO+BaO is from 9 to 18%.

4. The float glass substrate according to claim 1 , comprising, as represented by mass % based on oxides:
from 54 to 73% of SiO 2 ;
from 10.5 to 22.5% of Al 2 O 3 ;
from 0.1 to 5.5% of B 2 O 3 ;
from 0 to 8% of MgO;
from 0 to 9% of CaO;
from 0 to 16% of SrO; and
from 0 to 9% of BaO,
provided that the total of MgO, CaO, SrO and BaO represented by MgO+CaO+SrO+BaO is from 8 to 26%.

5. The float glass substrate according to claim 1 , having a Cl content of more than 0.35 mass % and 0.50 mass % or less and a β-OH of from 0.05 to 0.20 mm −1 .

6. The float glass substrate according to claim 1 , having a Cl content of from 0.10 to 0.35 mass % and a β-OH of from 0.20 to 0.50 mm −1 .

7. The float glass substrate according to claim 1 , having a strain point of 650° C. or more.

8. The float glass substrate according to claim 1 , having a strain point of 680° C. or more.

9. The float glass substrate according to claim 1 , having a substrate size of a short side of 2,100 mm or more and a long side of 2,400 mm or more.

10. The float glass substrate according to claim 1 , having a substrate size of a short side of 2,900 mm or more and a long side of 3,200 mm or more.

11. The float glass substrate according to claim 1 , having a plate thickness of 0.45 mm or less.

Assignees

• Agc Inc

Inventors

• Hirose Motoyuki

Classifications

• C03C3/091 Primary

  containing aluminium · CPC title

• C03C1/004

  Refining agents (refining C03B5/225) · CPC title

• C03B5/2252 Primary

  under reduced pressure, e.g. with vacuum refiners · CPC title

• C03B5/225

  Refining (C03B5/18 takes precedence {; Refining agents C03C1/004}) · CPC title

• C03B18/02

  Forming sheets · CPC title