Colored glass plate and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10011521-B2
Application number	US-201615290090-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Apr 23, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

To provide a colored glass plate of which the mass ratio of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 can be stably maintained at a high level while amber coloring derived from salt cake (Na 2 SO 4 ) is suppressed by reducing the amount of salt cake used as a refining agent, and which has less bubbles regardless of a small amount of total sulfur as calculated as SO 3 . A colored glass plate which is made of alkali-containing silica glass containing iron, tin and sulfur, wherein, as represented by mass % based on oxides, the proportion of total sulfur as calculated as SO 3 is less than 0.025%, the proportion of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 is at least 45%, the proportion of divalent tin as calculated as SnO 2 to total tin as calculated as SnO 2 is at least 0.1% as represented by mol %, and β-OH is at least 0.15 mm −1 .

First claim

What is claimed is:

1. A colored glass plate, comprising an alkali-containing silica glass comprising iron, tin and sulfur, wherein, as represented by mass % based on oxides:
the proportion of Na 2 O is from 0.5 to 50%,
the proportion of total sulfur as calculated as SO 3 is from 0.005 to less than 0.025%,
the proportion of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 is at least 45%,
the proportion of divalent tin as calculated as SnO 2 to total tin as calculated as SnO 2 is at least 0.1% as represented by mol %, and
wherein β-OH is at least 0.15 mm −1 .

2. The colored glass plate according to claim 1 , wherein the proportion of divalent tin as calculated as SnO 2 to total tin as calculated as SnO 2 is at least 1% as represented by mol %.

3. The colored glass plate according to claim 1 , wherein the proportion of divalent tin as calculated as SnO 2 to total tin as calculated as SnO 2 is from 0.2 to 40% as represented by mol %.

4. The colored glass plate according to claim 1 , wherein the proportion of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 is at least 55%.

5. The colored glass plate according to claim 1 , wherein the proportion of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 is at least 60%.

6. The colored glass plate according to claim 1 , wherein the proportion of total sulfur as calculated as SO 3 as represented by mass % based on oxides is at least 0.01% and less than 0.02%.

7. The colored glass plate according to claim 1 , wherein the proportion of total sulfur as calculated as SO 3 as represented by mass % based on oxides is from 0.010% to less than 0.025%.

8. The colored glass plate according to claim 1 , which contains substantially no TiO 2 .

9. The colored glass plate according to claim 1 , comprising TiO 2 , and having a TiO 2 content of at most 3.0% as represented by mass % based on oxides.

10. The colored glass plate according to claim 1 , wherein the proportion of MgO as represented by mass % based on oxides is less than 2%.

11. The colored glass plate according to claim 1 , which contains, as represented by mass % based on oxides:

SiO 2
30 to 80%, 

Al 2 O 3
0 to 30% 

B 2 O 3
0 to 20%,

MgO
0 to 30%,

CaO
0 to 30%,

Na 2 O
0.5 to 50%,  

K 2 O
0 to 50%,

total iron as calculated as Fe 2 O 3
 0.001 to 5%, and

total tin as calculated as SnO 2
0.001 to 5%.  

12. The colored glass plate according to claim 1 , which contains, as represented by mass % based on oxides:

SiO 2
65 to 73%, 

Al 2 O 3
3 to 5% 

B 2 O 3
0 to 1%,

MgO
at least 0% and less than 2%,

CaO
7 to 10%, 

Na 2 O
12 to 16%, 

K 2 O
1 to 5%,

total iron as calculated as Fe 2 O 3
  0.1 to 0.9%, and

total tin as calculated as SnO 2
0.02 to 0.3%.  

13. The colored glass plate according to claim 1 , which contains substantially no B 2 O 3 and contains, as represented by mass % based on oxides:

SiO 2
65 to 73%,

Al 2 O 3
  3 to 5%

MgO
at least 0% and less than 2%,

CaO
 7 to 10%,

Na 2 O
12 to 16%,

K 2 O
 1 to 5%,

total iron as calculated as Fe 2 O 3
    0.3 to 0.9%, and

total tin as calculated as SnO 2
0.02 to 0.3%. 

14. The colored glass plate according to claim 1 , which contains, as represented by mass % based on oxides:

SiO 2
65 to 75%, 

Al 2 O 3
0 to 3% 

B 2 O 3
0 to 1%,

MgO
2 to 5%,

CaO
7 to 10%, 

Na 2 O
11 to 15%, 

K

Assignees

• Asahi Glass Co Ltd

Inventors

• Nagai Kensuke
• Shimada Yuya
• Arai Yusuke

Classifications

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03B19/02

  by casting {molten glass, e.g. injection moulding} · CPC title

• C03C3/089

  containing boron · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/064

  containing boron · CPC title