# US 5,348,915 A · High-gloss ceramic frits

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- Number: US 5,348,915 A
- Document ID: US5348915A
- Status: Granted
- Kind: A
- Application number: 08/034,488
- Filed: 1993-03-19
- Granted: 1994-09-20
- Earliest claimed: 1992-03-31
- Assignees: Ferro Corporation
- Inventors: Peter Thometzek
- Web page: https://patentgrep.com/patent/US5348915A

## CPC

- C03C 8/04: containing zinc
- C03C 8/08: containing phosphorus
- 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

Lead-free ceramic frits for producing glazes with intrinsic opacity, and methods of coationg ceramic substrates with the ceramic frits, wherein the ceramic frits have the following composition: ______________________________________ SiO.sub.2 48-60 wt. % B.sub.2 O.sub.3 3-8 wt. % Al.sub.2 O.sub.3 4-8 wt. % Na.sub.2 O 0.2-2.0 wt. % K.sub.2 O 4-8 wt. % MgO 0-2 wt. % CaO 7.5-13 wt. % BaO 0-5 wt. % ZnO 7-12 wt. % ZrO.sub.2 0.3-2.5 wt. % TiO.sub.2 3.5-5.5 wt. % P.sub.2 O.sub.5 0-3 wt. % and Na.sub.2 O + K.sub.2 O 4.5-8.5 wt. %. ______________________________________

## Claims

### Claim 1

Lead-free ceramic frits for producing glazes with intrinsic opacity, wherein the ceramic frits have the following composition:
______________________________________ SiO.sub.2 48-60 wt. % B.sub.2 O.sub.3 3-8 wt. % Al.sub.2 O.sub.3 4-8 wt. % Na.sub.2 O 0.2-2.0 wt. % K.sub.2 O 4-8 wt. % MgO 1-2 wt. % CaO 7.5-13 wt. % BaO 0-5 wt. % ZnO 7-12 wt. % ZrO.sub.2 0.3-2.5 wt. % TiO.sub.2 3.5-5.5 wt. % P.sub.2 O.sub.5 .1-3 wt. % and Na.sub.2 O + K.sub.2 O 4.5-8.5 wt. %. ______________________________________

### Claim 2 (depends on 1)

Ceramic frits according to claim 1, wherein the ceramic frits have the following composition:
______________________________________ SiO.sub.2 52-60 wt. % B.sub.2 O.sub.3 4-7 wt. % Al.sub.2 O.sub.3 4-7 wt. % Na.sub.2 O 1-2 wt. % K.sub.2 O 4-6.5 wt. % MgO 1-2 wt. % CaO 9-11 wt. % ZnO 8-10 wt. % ZrO.sub.2 0.5-1.0 wt. % TiO.sub.2 4.5-5.5 wt. % P.sub.2 O.sub.5 0.1-2.2 wt. and Na.sub.2 O + K.sub.2 O 4.5-8.5 wt. %. ______________________________________

### Claim 3 (depends on 1)

A glaze slip for producing glazes on ceramic substrates, wherein the glaze slip contains at least 65 wt. % of a frit according to claim 1 and one or more of the substances from the following group: kaolin, bentonite, China clay, quartz, aluminum oxide, molochite, feldspar, talc, pigments and opacifiers.

### Claim 4 (depends on 2)

A glaze slip for producing glazes on ceramic substrates, wherein the glaze slip contains at least 65 wt. % of a frit according to claim 2 and one or more of the substances from the following group: kaolin, bentonite, China clay, quartz, aluminum oxide, molochite, feldspar, talc, pigments and opacifiers.

### Claim 5 (depends on 1)

A glaze slip for producing glazes on ceramic substrates, wherein the glaze slip contains at least 85 wt. % of a frit according to claim 1 and one or more of the substances from the following group: kaolin, bentonite, China clay, quartz, aluminum oxide, molochite, feldspar, talc, pigments and opacifiers.

### Claim 6 (depends on 2)

A glaze slip for producing glazes on ceramic substrates, wherein the glaze slip contains at least 85 wt. % of a frit according to claim 2 and one or more of the substances from the following group: kaolin, bentonite, China clay, quartz, aluminum oxide, molochite, feldspar, talc, pigments and opacifiers.