# US 10,766,803 B2 · Method for producing bent glass article, and bent glass article

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- Number: US 10,766,803 B2
- Document ID: US10766803B2
- Status: Granted
- Kind: B2
- Application number: 15/703,586
- Filed: 2017-09-13
- Published: 2018-03-15
- Granted: 2020-09-08
- Earliest claimed: 2016-09-14
- Assignees: AGC Inc.
- Applicants: AGC Inc.
- Inventors: Makoto Fujii; Satoshi Kanasugi; Naofumi Aoyama
- Web page: https://patentgrep.com/patent/US10766803B2

## CPC

- C03B 25/025: {Glass sheets}
- C03B 23/0252: {by gravity only, e.g. sagging (C03B23/035 takes precedence)}
- C03B 23/0258: {Gravity bending involving applying local or additional heating, cooling or insulating means}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 3/083: containing aluminium oxide or an iron compound
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- Y02P 40/57: Improving the yield, e-g- reduction of reject rates
- Y10T 428/315: Surface modified glass [e.g., tempered, strengthened, etc.]
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for producing a bent glass article includes a heat treatment step of heat-treating a bent glass. The bent glass includes a first main stir-face, a second main surface and an end face. In the heat treatment step, the bent glass is supported by a support jig with one of the main surfaces facing downward. The support jig supports at least a part of one of the main surfaces or the end face in a higher position than the lowest position of one of the main surfaces.

## Claims

### Claim 1

A bent glass article comprising:
a first main surface;
a second main surface;
an end face; and
a curvature part provided at least partially,
wherein a main stress difference near the end face in one of the main surfaces is 5 MPa or less.

### Claim 2 (depends on 1)

The bent glass article according to claim 1, wherein a main stress difference in the curvature part in one of the main surfaces is 5 MPa or less.

### Claim 3 (depends on 1)

The bent glass article according to claim 1, comprising a chemically strengthened glass.

### Claim 4 (depends on 1)

The bent glass article according to claim 1, which has a Young's modulus of 45 GPa or more.

### Claim 5 (depends on 1)

The bent glass article according to claim 1, which has a Young's modulus of 90 GPa or less.

### Claim 6 (depends on 1)

The bent glass article according to claim 1, wherein the curvature part has a curvature radius of 5,000 mm or less.

### Claim 7 (depends on 1)

A method for producing the bent glass article of claim 1, comprising:
heat-treating a bent glass including a first main surface, a second main surface and an end face,
while the bent glass is supported by a support jig with one of the main surfaces facing downward such that
the support jig supports at least a part of the one of the main surfaces or the end face in a higher position than the lowest position of the one of the main surfaces.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the heat treatment is an annealing.

### Claim 9 (depends on 7)

The method according to claim 7, further comprising:
contacting a sheet glass with a mold to form the bent glass,
wherein in the heat treatment, the surface of the bent glass which was in contact with the mold is supported by the support jig.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the heat treatment is performed after the bent glass is cooled at a cooling rate of 5° C./min or more in a region where equilibrium viscosity of the bent glass is from 1012.5 Pa·s to 1020 Pa·s.

### Claim 11 (depends on 7)

The method according to claim 7, wherein in the heat treatment, the bent glass is heated until equilibrium viscosity of the bent glass reaches a range of from 1012.5 Pa·s to 1017 Pa·s.

### Claim 12 (depends on 7)

The method according to claim 7, wherein the heat treatment comprises heating the bent glass to a predetermined temperature, and slowly cooling.

### Claim 13 (depends on 12)

The method according to claim 12, further comprising:
chamfering at least a part of the bent glass after the slowly cooling.

### Claim 14 (depends on 13)

The method according to claim 13, wherein in the chamfering, the end face of the bent glass is chamfered.

### Claim 15 (depends on 12)

The method according to claim 12, further comprising:
cutting at least a part of the bent glass after the slowly cooling.

### Claim 16 (depends on 15)

The method according to claim 15, wherein in the cutting, a peripheral part including the end face in the bent glass is cut off.

### Claim 17 (depends on 1)

The bent glass article according to claim 1, wherein the curvature part includes a twisted structure.