# US 11,897,821 B2 · Ceramic product

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- Number: US 11,897,821 B2
- Document ID: US11897821B2
- Status: Granted
- Kind: B2
- Application number: 17/946,830
- Filed: 2022-09-16
- Published: 2023-01-26
- Granted: 2024-02-13
- Earliest claimed: 2018-01-19
- Assignees: Saga Prefecture
- Applicants: Saga Prefecture
- Inventors: Atsunori Shiraishi
- Web page: https://patentgrep.com/patent/US11897821B2

## CPC

- C03C 8/14: Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C04B 41/86: Glazes; Cold glazes
- C03C 3/093: containing zinc or zirconium
- C03C 8/02: Frit compositions, i.e. in a powdered or comminuted form
- C03C 8/04: containing zinc
- C03C 8/20: containing titanium compounds; containing zirconium compounds
- C04B 33/34: combined with glazing
- C04B 41/009: {characterised by the material treated}
- C04B 41/5022: {with vitreous materials (composition of vitreous glazes and enamels C03C; ceramic pigments C09C1/0009)}
- 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
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A ceramic product includes a glass layer having 0.1 wt % to 9 wt % of a luster pigment for providing a metallic look. The glass layer includes 40 wt % to 60 wt % of silicon dioxide, 15 wt % to 35 wt % of boron oxide, 18 wt % or less of one or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide, 4 wt % or less of one or more alkali metal oxides selected from lithium oxide and sodium oxide, and 5 wt % or more of potassium oxide.

## Claims

### Claim 1

A ceramic product comprising:
a product made of ceramic, and
a glass layer applied onto the product and comprising 0.1 wt % to 9 wt % of a luster pigment for providing a metallic look,
wherein the glass layer further comprises 40 wt % to 60 wt % of silicon dioxide,
15 wt % to 35 wt % of boron oxide,
18 wt % or less of alkali metal oxides consisting of lithium oxide, sodium oxide, and potassium oxide,
4 wt % or less of alkali metal oxides consisting of lithium oxide and sodium oxide, and
5 wt % or more of potassium oxide.

### Claim 2 (depends on 1)

The ceramic product according to claim 1, wherein the glass layer further comprises a non-luster pigment.

### Claim 3 (depends on 1)

The ceramic product according to claim 1, wherein the glass layer further comprises a chromogenic metal compound.

### Claim 4 (depends on 1)

The ceramic product according to claim 1, wherein the luster pigment comprises plate-shaped particles, and/or plate-shaped particles coated with one or more oxides selected from the group consisting of titanium oxide, ferric oxide, silicon oxide, tin oxide, and zirconium oxide.

### Claim 5 (depends on 4)

The ceramic product according to claim 4, wherein the plate-shaped particles are one or more selected from the group consisting of mica, silicon oxide, aluminum oxide, and borosilicate glass.

### Claim 6 (depends on 1)

The ceramic product according to claim 1, wherein a surface of the glass layer has a specular gloss value (Gs60°) of 60 or higher, and a value of luminous reflectance Y at a light receiving angle of 30° is increased from the value of luminous reflectance Y at a light receiving angle of 0° in a variable angle luminous intensity distribution measured at an incident light angle of −45°.

### Claim 7 (depends on 1)

The ceramic product according to claim 1, wherein the glass layer consists essentially of:
0.1 wt % to 9 wt % of the luster pigment for providing the metallic look,
40 wt % to 60 wt % of silicon dioxide,
15 wt % to 35 wt % of boron oxide,
18 wt % or less of alkali metal oxides consisting of lithium oxide, sodium oxide, and potassium oxide,
4 wt % or less of alkali metal oxides consisting of lithium oxide and sodium oxide, and
5 wt % or more of potassium oxide.