# US 8,785,335 B2 · Fluorophosphate glasses

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- Number: US 8,785,335 B2
- Document ID: US8785335B2
- Status: Granted
- Kind: B2
- Application number: 13/334,571
- Filed: 2011-12-22
- Published: 2012-06-28
- Granted: 2014-07-22
- Earliest claimed: 2010-12-23
- Assignees: Schott AG
- Applicants: Simone Ritter; Bianca Schreder; Ute Woelfel; Stefanie Hansen
- Inventors: Simone Ritter; Bianca Schreder; Ute Woelfel; Stefanie Hansen
- Web page: https://patentgrep.com/patent/US8785335B2

## CPC

- C03C 3/247: containing fluorine and phosphorus
- C03B 5/173: Apparatus for changing the composition of the molten glass in glass furnaces, e.g. for colouring the molten glass (chemical aspects C03C)
- C03B 5/193: using gas, e.g. bubblers
- C03C 4/02: for coloured glass
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES

## Abstract

Glass having an optimized degree of cross-linking of the phosphate component in the glass matrix is provided so that excellent weatherability is achieved. These glasses are fluorophosphate glasses that contain copper oxide as coloring component. The glasses can further contain coloring components and are obtainable in a method that includes a bubbling step.

## Claims

### Claim 1

A fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
% by weight
min.
max.
P2O5
25
60
Al2O3
1
13
MgO
1
10
CaO
1
16
BaO
1
26
SrO
0
16
ZnO
0
10
Li2O
0
13
Na2O
0
10
K2O
4
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
15
40
ΣR2O (R = Li, Na, K)
3
18
wherein up to 39% by molar quantity of the O2− ions are replaced with F.

### Claim 2 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the composition in % by weight further comprises:
% by weight
min.
max.
P2O5
25
42
Al2O3
3
12
MgO
1
6
CaO
1
11
BaO
9
26
SrO
0
16
Li2O
2
10
Na2O
0
7
K2O
4
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
23
40
ΣR2O (R = Li, Na, K)
3
18.

### Claim 3 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the composition in % by weight further comprises:
% by weight
min.
max.
P2O5
43
60
Al2O3
1
6
MgO
3
10
CaO
3
16
BaO
1
16
SrO
0
2
Li2O
0
7
Na2O
2
10
K2O
4
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
15
32
ΣR2O (R = Li, Na, K)
10
18.

### Claim 4 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the content of CuO is lower than 3% by weight.

### Claim 5 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the content of CuO is at least 3% by weight.

### Claim 6 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the composition does not contain further colorizing oxides in addition to CuO.

### Claim 7 (depends on 1)

The fluorophosphate glass according to claim 1, further comprising a coating on at least one surface.

### Claim 8 (depends on 1)

The fluorophosphate glass according to claim 1, wherein the cross-link degree is at most 99%.

### Claim 9

A filter glass comprising:
fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
% by weight
min.
max.
P2O5
25
60
Al2O3
1
13
MgO
1
10
CaO
1
16
BaO
1
26
SrO
0
16
ZnO
0
10
Li2O
0
13
Na2O
0
10
K2O
4
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
15
40
ΣR2O (R = Li, Na, K)
3
18
wherein up to 39% by molar quantity of the O2− ions are replaced with F.

### Claim 10

A method for the production of a filter glass, the method comprising the steps of:
preparing a glass melt from glass components; and
bubbling oxygen through the glass melt to provide a fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
% by weight
min.
max.
P2O5
25
60
Al2O3
1
13
MgO
1
10
CaO
1
16
BaO
1
26
SrO
0
16
ZnO
0
10
Li2O
0
13
Na2O
0
10
K2O
4
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
15
40
ΣR2O (R = Li, Na, K)
3
18
wherein up to 39% by molar quantity of the O2− ions are replaced with F.

### Claim 11

A fluorophosphate glass comprising a composition in % by weight of:
% by weight
min.
max.
P2O5
25
60
Al2O3
1
13
MgO
1
10
CaO
1
16
BaO
1
26
SrO
0
16
ZnO
0
10
Na2O
2
10
K2O
0.01
11
CuO
1
7
ΣRO (R = Mg, Ca, Sr, Ba)
15
40
ΣR2O (R = Na, K)
3
18
wherein the composition is free of lithium oxide and up to 39% by molar quantity of the O2− ions are replaced with F.