Filter gas

Patent metadata

Field	Value
Publication number	US-10703669-B2
Application number	US-201815964083-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Apr 28, 2017
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

The invention relates to a filter glass comprising Na 2 O and K 2 O and the following (in % by weight on an oxide basis):

P 2 O 5
58-68 

Al 2 O 3
5-10

CuO
8-15

V 2 O 5
0.05-1   

SiO 2
<2

F
<1

Total R′O (R′ = Mg, Ca, Sr, Ba)
0-11

Total R 2 O (R = Li, Na, K)
 3-17.

First claim

The invention claimed is:

1. Filter glass comprising Na 2 O and K 2 O and the following (in % by weight on an oxide basis):

P 2 O 5
58-68 

Al 2 O 3
5-10

CuO
8-15

V 2 O 5
0.05-1   

SiO 2
<2

F
<1

Total R′O (R′ = Mg, Ca, Sr, Ba)
0-11

Total R 2 O (R = Li, Na, K)
3-17

wherein a ratio of K 2 O (in % by weight)/Na 2 O (in % by weight) is >1.

2. Filter glass according to claim 1 , wherein the filter glass contains K 2 O in an amount of from 3 to 10% by weight and Na 2 O in an amount of from 0.1 to 8% by weight.

3. Filter glass according to claim 1 , wherein the total R 2 O is at least 4% by weight and at most 15% by weight.

4. Filter glass according to claim 1 , wherein the ratio of K 2 O (in % by weight)/Na 2 O (in % by weight) is >1.1.

5. Filter glass according to claim 1 , wherein the filter glass contains MgO in an amount of at most 5% by weight and the total proportion of R′O is at least 1% by weight.

6. Filter glass according to claim 1 , wherein the content of CuO is at least 9% by weight and at most 14% by weight.

7. Filter glass according to claim 1 , wherein the content of CuO is at least 10% by weight and at most 13% by weight.

8. Filter glass according to claim 1 , wherein V 2 O 5 is present in an amount of at least 0.2% by weight.

9. Filter glass according to claim 1 , wherein V 2 O 5 is present in an amount of at least 0.5% by weight and at most 0.75% by weight.

10. Filter glass according to claim 1 , wherein the filter glass further comprises La 2 O 3 at a content of at least 0.5% by weight and at most 3.5% by weight.

11. Filter glass according to claim 1 , wherein the glass is free of one or more components selected from the group consisting of B 2 O 3 , SiO 2 , CaO, BaO, SrO, ZnO, ZrO 2 , Nb 2 O 5 , Y 2 O 3 , Yb 2 O 3 , Gd 2 O 3 , WO 3 , Fe 2 O 3 , PbO, CoO, Cr, Mn, Ni, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er and Tm.

12. Filter glass according to claim 1 , wherein the glass has, at a sample thickness of 0.11 mm, an internal transmission τ i at a wavelength of 400 nm of more than 85%.

13. Filter glass according to claim 1 , wherein the filter glass has a coefficient of thermal expansion (α 20-300 ) of at least 9.5×10 −6 /K and at most 13×10 −6 /K.

14. Filter glass according to claim 1 , wherein the filter glass has a transformation temperature of more than 400° C.

15. Filter comprising a filter glass, the filter glass comprising Na 2 O and K 2 O and the following (in % by weight on an oxide basis):

P 2 O 5
58-68 

Al 2 O 3
5-10

CuO
8-15

V 2 O 5
0.05-1   

SiO 2
<2

F
<1

Total R′O (R′ = Mg, Ca, Sr, Ba)
0-11

Total R 2 O (R = Li, Na, K)
3-17

wherein a ratio of K 2 O (in % by weight)/Na 2 O (in % by weight) is >1.

16. Filter according to claim 15 , wherein the filter glass has a coating on at least one of its surfaces.

17. Filter glass according to claim 1 , wherein the ratio of K 2 O (in % by weight)/Na 2 O (in % by weight) is <2.

18. Filter glass according to claim 1 , wherein the glass has, at a sample thickness of 0.11 mm, an internal transmission τ i at a wavelength of 400 nm of at least 87.5%.

19. Filter glass having, at a sample thickness of 0.11 mm, an internal transmission τ i at a wavelength of 400 nm of more than 85%, and a T 50 value in the range 625 nm to 640 nm, wherein the filter glass is a vanadium oxide containing phosphate-glass comprising CuO at a content of 8-15% by weight and comprising La 2 O 3 at a content of 0.1-4% by weight.

20. Filter glass having, at a sample thickness of 0.11 mm, an internal transmission τ i at a wavelength of 400 nm of more than 85%, and a T 50 value in the range 625 nm to 640 nm, wherein the filter glass is a vanadium oxide containing phosphate-glass comprising CuO at a content of 8-15% by weight, wherein a ratio of K 2 O (in % by weight)/Na 2 O (in % by weight) is >1.

21. Filter glass according to claim 19 , comprising Na 2 O and K 2 O and the following (in % by weight on an oxide basis):

P 2 O 5
58-68 

Al 2 O 3
5-10

V 2 O 5
0.05-1   

SiO 2
<2

F
<1

Total R′O (R′ = Mg, Ca, Sr, Ba)
0-11

Total R 2 O (R = Li, Na, K)
 3-17.

22. Filter glass according to claim 20 , comprising Na 2 O and K 2 O and the following (in % by weight on an oxide basis):

Assignees

• Schott Ag

Inventors

• Schreder Bianca
• Woelfel Ute
• Hansen Stefanie

Classifications

• C03C4/00

  Compositions for glass with special properties · CPC title

• C03C4/082

  for infrared absorbing glass · CPC title

• C03C3/062 Primary

  with less than 40% silica by weight · CPC title

• C03C4/02 Primary

  for coloured glass · CPC title

• C03C3/21

  containing titanium, zirconium, vanadium, tungsten or molybdenum · CPC title