# US 11,027,525 B2 · Curved laminated glass and manufacturing method for curved laminated glass

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- Number: US 11,027,525 B2
- Document ID: US11027525B2
- Status: Granted
- Kind: B2
- Application number: 16/340,057
- Filed: 2017-09-28
- Published: 2020-02-20
- Granted: 2021-06-08
- Earliest claimed: 2016-10-07
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jun Hak Oh; Chang Hee Lee; Jae Hyuk Yoon; Ho Seong Kang
- Web page: https://patentgrep.com/patent/US11027525B2

## CPC

- B32B 17/10119: {having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10889: {shaping the sheets, e.g. by using a mould (B32B17/10816 takes precedence)}
- C03B 23/023: by bending
- C03C 3/085: containing an oxide of a divalent metal
- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10871: {in combination with particular heat treatment}
- B32B 2307/536: Hardness
- B32B 2315/08: Glass
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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

## Abstract

The present disclosure provides a curved laminated glass including a curved soda lime glass and a curved thin plate glass provided on a concave surface of the curved soda lime glass, in which a thickness of the curved soda lime glass is larger than a thickness of the curved thin plate glass, and compressive stress is formed on a surface opposite to a surface of the curved thin plate glass adjacent to the curved soda lime glass.

## Claims

### Claim 1

A curved laminated glass for automobile comprising:
a curved soda lime glass; and
a curved thin plate glass provided on a concave surface of the curved soda lime glass,
wherein a thickness of the curved soda lime glass is larger than a thickness of the curved thin plate glass,
wherein a first surface of the curved thin plate glass is adjacent to the curved soda lime glass, and compressive bending stress is formed on a second surface of the curved thin plate, which is opposite to the first surface of the curved thin plate glass,
wherein the curved thin plate glass is non-tempered alkali-free glass including 26 wt % to 29 wt % of Al2O3, and
wherein a Vickers hardness ratio of the curved soda lime glass to the curved thin plate glass is 1:1.1 to 1:1.3.

### Claim 2 (depends on 1)

The curved laminated glass for automobile of claim 1, wherein a thickness ratio of the curved soda lime glass to the curved thin plate glass is 1:0.1 to 1:0.5.

### Claim 3 (depends on 1)

The curved laminated glass for automobile of claim 1, wherein the thickness of the curved thin plate glass is 0.3 mm to 1.0 mm.

### Claim 4 (depends on 1)

The curved laminated glass for automobile of claim 1, wherein the curved thin plate glass is laminated onto the concave surface of the curved soda lime glass by a lamination film or an adhesive.

### Claim 5 (depends on 1)

The curved laminated glass for automobile of claim 1, wherein the curved thin plate glass has a Vickers hardness of 5.5 GPa to 7 GPa.

### Claim 6

A method for manufacturing a curved laminated glass for automobile, the method comprising:
preparing a curved soda lime glass;
providing a thin plate glass which is flat on a concave surface of the curved soda lime glass; and
laminating the thin plate glass onto the concave surface of the soda lime glass by elastically deforming the thin plate glass to form a curved thin plate glass,
wherein a thickness of the curved soda lime glass is larger than a thickness of the curved thin plate glass,
wherein a first surface of the curved thin plate glass is adjacent to the curved soda lime glass, and compressive bending stress is formed on a second surface of the curved thin plate, which is opposite to the first surface of the curved thin plate glass,
wherein the curved thin plate glass is non-tempered alkali-free glass including 26 wt % to 29 wt % of Al2O3, and
wherein a Vickers hardness ratio of the curved soda lime glass to the curved thin plate glass is 1:1.1 to 1:1.3.

### Claim 7 (depends on 6)

The method of claim 6, wherein in the step of laminating, the thin plate glass is elastically deformed at a temperature of 20° C. to 35° C.

### Claim 8 (depends on 6)

The method of claim 6, wherein in the step of laminating, the curved thin plate glass is laminated onto a concave surface of the curved soda lime glass by using a lamination film or an adhesive.

### Claim 9 (depends on 6)

The method of claim 6, wherein a thickness ratio of the curved soda lime glass to the curved thin plate glass is 1:0.1 to 1:0.5.

### Claim 10 (depends on 6)

The method of claim 6, wherein the thickness of the curved thin plate glass is 0.3 mm to 1.0 mm.

### Claim 11 (depends on 6)

The method of claim 6, wherein the curved thin plate glass has a Vickers hardness of 5.5 GPa to 7 GPa.