Arsenic and antimony free, titanium oxide containing borosilicate glass and methods for the production thereof

Patent metadata

Field	Value
Publication number	US-9650289-B2
Application number	US-201213572870-A
Country	US
Kind code	B2
Filing date	Aug 13, 2012
Priority date	Aug 12, 2011
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

Titanium oxide containing borosilicate glasses, which have been produced without the use of arsenic and antimony compounds, are provided. An environmentally friendly refining method for providing titanium oxide containing borosilicate glass is also provided. The method includes using oxygen containing selenium compounds as refining agents to provide glasses with good transmittance values in the infrared range and show no disturbing discolorations. The glasses of the present disclosure are particularly suitable for the production of IR light conductors, cover glasses for photo sensors, and UV filters.

First claim

What is claimed is:

1. An arsenic- and antimony-free colorless borosilicate glass, consisting essentially of the following oxides, in % by weight, based on the total amount of glass:

SiO 2
30 to 85; 

B 2 O 3
3 to 20;

Al 2 O 3
0 to 15;

Na 2 O
3 to 15;

K 2 O
3 to 15;

ZnO
0 to 12;

TiO 2
0.5 to 10;  

CaO
0 to 0.1

at least one oxygen containing selenium compound 0.001 to 0.1; and
a sulfate content of at least 150 ppm (m/m),
wherein the oxygen containing selenium compound is selected from the group consisting of salts of selenious acid, salts of selenic acid, selenium dioxide (SeO 2 ), selenium trioxide (SeO 3 ), and mixtures thereof.

2. The glass according to claim 1 , consisting essentially of the following oxides, in % by weight, based on the total amount of glass:

SiO 2
40 to 70; 

B 2 O 3
3 to 15;

Al 2 O 3
0 to 10;

Na 2 O
3 to 12;

K 2 O
3 to 12;

ZnO
0 to 8; 

TiO 2
0.5 to 6;  

CaO
 0 to 0.1;

and
at least one oxygen containing selenium compound 0.001 to 0.1.

3. The glass according to claim 1 , consisting essentially of the following oxides, in % by weight, based on the total amount of glass:

SiO 2
30 to 85; 

B 2 O 3
3 to 20;

Al 2 O 3
0 to 15;

Na 2 O
3 to 15;

K 2 O
3 to 15;

ZnO
0 to 12;

TiO 2
0.5 to 10;  

CaO
 0 to 0.1;

and
at least one oxygen containing selenium compound 0.001 to 0.1.

4. The glass according to claim 1 , wherein the glass is usable as an IR light conductor, a cover glass for a photo sensor, or a filter glass.

5. The glass according to claim 1 , wherein the sulfate content is not higher than 450 ppm (m/m).

6. An arsenic- and antimony-free borosilicate glass, consisting of the following oxides, in % by weight, based on the total amount of glass:

SiO 2
 35 to 70;

B 2 O 3
  3 to 17;

Al 2 O 3
  0 to 12;

Na 2 O
  3 to 12;

K 2 O
  3 to 12;

ZnO
  0 to 10;

TiO 2
0.5 to 8;

CaO
  0 to 0.1;

and
at least one oxygen containing selenium compound 0.001 to 0.1,
wherein the oxygen containing selenium compound is selected from the group consisting of salts of selenious acid, salts of selenic acid, selenium dioxide (SeO 2 ), selenium trioxide (SeO 3 ), and mixtures thereof.

7. An arsenic- and antimony-free colorless borosilicate glass, comprising the following oxides, in % by weight, based on the total amount of glass:

at least one oxygen containing selenium compound 0.001 to 0.1; and
sulfate,
wherein the oxygen containing selenium compound is selected from the group consisting of salts of selenious acid, salts of selenic acid, selenium dioxide (SeO 2 ), selenium trioxide (SeO 3 ), and mixtures thereof.

8. The glass according to claim 7 , wherein the sulfate has a content that is not higher than 450 ppm (m/m).

9. The glass according to claim 7 , wherein the sulfate has a content that is not higher than 350 ppm (m/m).

10. The glass according to claim 7 , wherein the sulfate has a content that is not higher than 250 ppm (m/m).

11. The glass according to claim 7 , wherein the sulfate has a content that is at least 150 ppm (m/m).

Assignees

• Wegener Holger
• Schwertfeger Rainer
• Grygarova Lenka
• Kassner Reinhard
• Schott Ag

Inventors

• Wegener Holger
• Schwertfeger Rainer
• Grygarova Lenka
• Kassner Reinhard

Classifications

• C03C3/11

  containing halogen or nitrogen · CPC title

• C03C4/10 Primary

  for infrared transmitting glass · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C4/085

  for ultraviolet absorbing glass · CPC title

• C03C3/087

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