# US 2025/0083992 A1 · Glass, especially as a cover

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- Number: US 2025/0083992 A1
- Document ID: US20250083992A1
- Status: Published application
- Kind: A1
- Application number: 18/825,608
- Filed: 2024-09-05
- Published: 2025-03-13
- Earliest claimed: 2023-09-07
- Assignees: Schott AG; SCHOTT Technical Glass Solutions GmbH
- Applicants: Schott AG; SCHOTT Technical Glass Solutions GmbH
- Inventors: Sebastian Leukel; Patrick Wilde; Eric Oberländer
- Web page: https://patentgrep.com/patent/US20250083992A1

## CPC

- C03C 3/11: containing halogen or nitrogen
- C03C 4/02: for coloured glass
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 2204/00: Glasses, glazes or enamels with special properties
- H05K 5/03: Covers
- 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
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A chemically temperable or chemically tempered glass includes SiO2, Al2O3, Li2O and B2O3 as constituents. The following applies for the constituents (in mol % based on oxide): 0.8<Li2O/(Li2O+K2O+Na2O)≤1 and 0.1<B2O3≤8.5.

## Claims

### Claim 1

A chemically temperable or chemically tempered glass, comprising:
SiO2, Al2O3, Li2O and B2O3 as constituents, characterized in that the following applies for the constituents (in mol % based on oxide): 0.8<Li2O/(Li2O+K2O+Na2O)≤1 and 0.1<B2O3≤8.5.

### Claim 2 (depends on 1)

The glass of claim 1, further comprising Na2O and/or K2O.

### Claim 3 (depends on 1)

The glass of claim 1, characterized in that:
an upper devitrification temperature OEG is less than 10 K above a processing temperature VA;
a temperature at a viscosity of 102 dPas is at most 1800° C.; and
a coefficient of thermal expansion CTE20-300 is less than 5.4 ppm/K.

### Claim 4 (depends on 1)

The glass of claim 1, wherein the glass comprises the following constituents (in mol % based on oxide):
SiO2
62-72;
Al2O3
7-14;
B2O3
0.1-8.5;
Li2O
5-12;
Na2O
0-2; and
K2O
0-2.

### Claim 5 (depends on 4)

The glass of claim 4, wherein the glass comprises the following constituents (in mol % based on oxide):
SiO2
65-70;
Al2O3
8-12;
B2O3
4-7;
Li2O
7-10;
Na2O
0-1; and
K2O
0-1.

### Claim 6 (depends on 1)

The glass of claim 1, wherein the glass further comprises the following constituents (in mol % based on oxide):
MgO
0-5;
CaO
0-8;
SrO
0-5;
BaO
0-2;
ZnO
0-5;
P2O5
0-5; and
ZrO2
0-5.

### Claim 7 (depends on 6)

The glass of claim 6, wherein the glass comprises the following constituents (in mol % based on oxide):
MgO
0.5-3;
CaO
1-6;
SrO
0-1;
BaO
0-2;
ZnO
0-1;
P2O5
0.5-2; and
ZrO2
0-3.

### Claim 8 (depends on 6)

The glass of claim 6, characterized in that the following applies for the constituents (in mol % based on oxide):
0.9<(Al2O3+B2O3+ZrO2)/(R2O+RO)<1.7; and/or
0.5<Al2O3/(R2O+RO)<1.1; wherein R2O=Li2O+K2O+Na2O and RO=MgO+CaO+SrO+BaO+ZnO.

### Claim 9 (depends on 8)

The glass of claim 8, wherein 1<(Al2O3+B2O3+ZrO2)/(R2O+RO)<1.6 and/or 0.6<Al2O3/(R2O+RO)<0.9.

### Claim 10 (depends on 1)

The glass of claim 1, wherein the glass contains 0 to 1 mol % of SnO2 and/or 0 to 1 mol % of CeO2, and/or 0 to 1 mol % of Cl.

### Claim 11 (depends on 10)

The glass of claim 10, wherein the glass contains 0.1 to 0.5 mol % of SnO2.

### Claim 12 (depends on 10)

The glass of claim 10, wherein a sum of CeO2+SnO2+Cl is at most 2 mol %.

### Claim 13 (depends on 1)

The glass of claim 1, wherein the glass is substantially free from coloring components.

### Claim 14 (depends on 1)

The glass of claim 1, wherein the glass contains at least 0.1 mol % and at most 5 mol % of at least one coloring component.

### Claim 15

A process for producing a tempered glass, the glass comprising SiO2, Al2O3, Li2O and B2O3 as constituents, wherein the following applies for the constituents (in mol % based on oxide): 0.8<Li2O/(Li2O+K2O+Na2O)≤1 and 0.1<B2O3≤8.5, the method comprising:
producing the glass by a melting process, a refining of a glass melt produced during the melting process, and a subsequent hot forming; and
performing at least one ion exchange in an exchange bath having a composition of 100% by weight to 0% by weight of KNO3 and 0% by weight to 100% by weight of NaNO3 and 0% by weight to 5% by weight of LiNO3 at a temperature of the exchange bath between 370° C. and 500° C. and a duration between 1 hour and 50 hours.

### Claim 16 (depends on 15)

The process of claim 15, wherein the hot forming is carried out by a drawing process comprising a float process or a down-draw process.

### Claim 17

A cover, comprising:
a tempered glass having a thickness of 0.3 mm to 1 mm, the glass comprising SiO2, Al2O3, Li2O and B2O3 as constituents, characterized in that the following applies for the constituents (in mol % based on oxide): 0.8<Li2O/(Li2O+K2O+Na2O)≤1 and 0.1<B2O3≤8.5.

### Claim 18 (depends on 17)

The cover of claim 17, wherein the glass further comprises Na2O and/or K2O.

### Claim 19 (depends on 17)

The cover of claim 17, characterized in that:
an upper devitrification temperature OEG of the glass is less than 10 K above a processing temperature VA of the glass;
a temperature at a viscosity of 102 dPas of the glass is at most 1800° C.; and
a coefficient of thermal expansion CTE20-300 of the glass is less than 5.4 ppm/K.

### Claim 20 (depends on 17)

The cover of claim 17, wherein the glass comprises the following constituents (in mol % based on oxide):
SiO2
62-72;
Al2O3
7-14;
B2O3
0.1-8.5;
Li2O
5-12;
Na2O
0-2; and
K2O
0-2.