# US 5,707,909 A · Lead-free glass composition and its use

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- Number: US 5,707,909 A
- Document ID: US5707909A
- Status: Granted
- Kind: A
- Application number: 08/604,395
- Filed: 1996-02-21
- Granted: 1998-01-13
- Earliest claimed: 1995-02-22
- Assignees: Cerdec Aktiengesellschaft Keramische Farben
- Inventors: Oliver Heitmann; Gerhard Tunker
- Web page: https://patentgrep.com/patent/US5707909A

## CPC

- C03C 8/06: containing halogen
- C03C 3/066: containing zinc
- C03C 3/118: containing aluminium
- 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

## Abstract

The invention pertains to a new lead-free glass composition with improved properties, a glass frit of this composition and its use for the production of glass-enamel, particularly for architectural glass. The glass composition contains in mole %: ______________________________________ Na.sub.2 O 10-15 K.sub.2 O 0.1-2 SiO.sub.2 40-50 B.sub.2 O.sub.3 8-12 TiO.sub.2 4-7 Al.sub.2 O.sub.3 0.1-3 ZnO 13-17 F 1-5 ______________________________________ and less than 0.5 weight % each of the oxides of the series PbO, CdO, P.sub.2 O.sub.5, and alkaline earth metal oxides. Use of a dye preparation containing the glass frit at 600.degree. to 650.degree. C. results in bakeable glazed, crack-free, acid and base resistant enamel layers.

## Claims

### Claim 1

A glass composition consisting essentially of, in mole %:
______________________________________ Na.sub.2 O 10-15 K.sub.2 O 0.1-2 SiO.sub.2 40-50 B.sub.2 O.sub.3 8-12 TiO.sub.2 4-7 Al.sub.2 O.sub.3 0.1-3 ZnO 13-17 F 1-5 ______________________________________
said composition having less than 0.5 weight % oxides of the series PbO, CdO, P.sub.2 O.sub.5, and alkaline earth metal oxides.

### Claim 2 (depends on 1)

A glass composition according to claim 1, consisting essentially of the following components in mole %:
______________________________________ Na.sub.2 O 10-14 K.sub.2 O 0.5-2 SiO.sub.2 40-50 B.sub.2 O.sub.3 8-12 TiO.sub.2 4-7 Al.sub.2 O.sub.3 0.5-2 ZnO 13-17 F 1-5. ______________________________________

### Claim 3 (depends on 2)

A glass composition according to claim 2, consisting essentially of the following components in mole %:
______________________________________ Na.sub.2 O 11-14 K.sub.2 O 1-2 SiO.sub.2 40-45 B.sub.2 O.sub.3 9-11 TiO.sub.2 4-7 Al.sub.2 O.sub.3 1-2 ZnO 14-16 F 1-3. ______________________________________

### Claim 4 (depends on 1)

A glass frit, wherein the composition of the glass is as defined in claim 1.

### Claim 5

A glass frit, wherein the composition of the glass consists essentially of the following components in mole %:
______________________________________ Na.sub.2 O 11-14 K.sub.2 O 1-2 SiO.sub.2 40-45 B.sub.2 O.sub.3 9-11 TiO.sub.2 4-7 Al.sub.2 O.sub.3 1-2 ZnO 14-16 F 1-3. ______________________________________

### Claim 6 (depends on 4)

A glass frit according to claim 4, wherein the minimum melting temperature of said frit lies between 600.degree. and 630.degree. C. in a 3-minute bake.

### Claim 7 (depends on 5)

A glass frit according to claim 5, wherein the minimum melting temperature of said frit lies between 600.degree. and 630.degree. C. in a 3-minute bake.