# US 2008/0188367 A1 · Silico-sodo-calcic glass composition for the production of substrates

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- Number: US 2008/0188367 A1
- Document ID: US20080188367A1
- Status: Published application
- Kind: A1
- Application number: 12/098,590
- Filed: 2008-04-07
- Published: 2008-08-07
- Earliest claimed: 2003-05-07
- Assignees: Saint-Gobain Glass France
- Inventors: Catherine GOULAS
- Web page: https://patentgrep.com/patent/US20080188367A1

## CPC

- C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- H01J 29/863: {Vessels or containers characterised by the material thereof}
- H01J 2329/8615: characterised by the material
- 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
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

The present invention relates to a glass composition intended for the manufacture of thermally stable substrates or plates that comprises the constituents given below, in the following proportions by weight: SiO2 67-75% Al2O3 0.5-1% ZrO2 2-7% Na2O 2-9% K2O 4-11% MgO 0-5% CaO 5-10% SrO 5-12% BaO 0-3% B2O3 0-3% Li2O 0-2% with the relationships: Na2O+K2O>10% MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C. It also relates to the use of these glass compositions for the production of substrates, especially for emissive displays and for fire-resistant glazing.

## Claims

### Claim 1

A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
SiO2
67-75%
Al2O3
0.5-1%
ZrO2
2-7%
Na2O
2-9%
K2O
4-11%
MgO
0-5%
CaO
5-10%
SrO
5-12%
BaO
0-3%
B2O3
0-3%
Li2O
0-2%
with the relationships
Na2O+K2O>10%
MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C.

### Claim 2 (depends on 1)

The glass substrate as claimed in claim 1, wherein the sum of the MgO, CaO, SrO and BaO contents is greater than or equal to 15%.

### Claim 3 (depends on 1)

The glass substrate as claimed in claim 1, wherein the sum of the Na2O and K2O contents is between 10 and 15%.

### Claim 4 (depends on 1)

The glass substrate as claimed in claim 1, wherein the weight ratio of the Na2O content to the K2O content is less than or equal to 0.7.

### Claim 5 (depends on 1)

The glass substrate as claimed in claim 1, wherein the SiO2 content is less than 71%.

### Claim 6 (depends on 1)

The glass substrate as claimed in claim 1, wherein the sum of the Al2O3 and ZrO2 contents is less than or equal to 6%.

### Claim 7 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass comprises the composition comprising the constituents below in the following proportions by weight:
SiO2
67-75%
Al2O3
0.5-1%
ZrO2
2-5%
Na2O
2-4%
K2O
7-11%
MgO
0-2%
CaO
6-10%
SrO
6-12%
BaO
0-2%
B2O3
0-3%
Li2O
0-2%.

### Claim 8 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a strain point of greater than 570° C.

### Claim 9 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a liquidus temperature Tliq of at most 1180° C.

### Claim 10 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a viscosity corresponding to log η=3.5 at a temperature at least equal to 1160° C.

### Claim 11 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a viscosity corresponding to log η=2 at a temperature not exceeding 1560° C.

### Claim 12 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a density at 25° C. of less than 3.

### Claim 13 (depends on 1)

The glass substrate as claimed in claim 1, wherein the thermal expansion coefficient is less than 85×10−7/° C.

### Claim 14 (depends on 1)

The glass substrate as claimed in claim 1, wherein the thermal expansion coefficient is between 81 and 84×10−7/° C.

### Claim 15 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a strain point of greater than 580° C.

### Claim 16 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a liquidus temperature Tliq of between 1130 and 11170° C.

### Claim 17 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a viscosity corresponding to log η=3.5 at a temperature between 1160 and 1200° C.

### Claim 18 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a viscosity corresponding to log η=2 at a temperature not exceeding 1550° C.

### Claim 19 (depends on 1)

The glass substrate as claimed in claim 1, wherein the glass has a density at 25° C. of around 2.7.

### Claim 20 (depends on 1)

A plasma-type emissive display comprising the glass substrate according to claim 1.

### Claim 21 (depends on 1)

A luminescent display comprising the glass substrate according to claim 1.

### Claim 22 (depends on 1)

A field-emission display comprising the glass substrate according to claim 1.

### Claim 23

A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
SiO2
67.5-75%
Al2O3
0.5-1%
ZrO2
2-7%
Na2O
2-9%
K2O
4-11%
MgO
0-5%
CaO
5-10%
SrO
5-12%
BaO
0-3%
B2O3
0-3%
Li2O
0-2%
with the relationships
Na2O+K2O>10%
MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C., wherein the glass has a viscosity corresponding to log η=3.5 at a temperature at least equal to 1160° C.

### Claim 24

A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
SiO2
67.5-75%
Al2O3
0.5-1%
ZrO2
2-7%
Na2O
2-9%
K2O
4-11%
MgO
0-5%
CaO
5-10%
SrO
5-12%
BaO
0-3%
B2O3
0-3%
Li2O
0-2%
with the relationships
Na2O+K2O>10%
MgO+CaO+SrO+BaO>12%
and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C., wherein the glass has a viscosity corresponding to log η=2 at a temperature not exceeding 1560° C.

### Claim 25 (depends on 23)

A emissive display comprising the glass substrate according to claim 23.

### Claim 26 (depends on 24)

A emissive display comprising the glass substrate according to claim 24.