# US 12,761,400 B2 · Stacked body and display device

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- Number: US 12,761,400 B2
- Document ID: US12761400B2
- Status: Granted
- Kind: B2
- Application number: 18/250,924
- Filed: 2021-10-29
- Published: 2024-10-03
- Granted: 2026-10-13
- Earliest claimed: 2020-10-30
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Atsushi Washio; Kazuki Yabumoto; Yosuke Wada; Keisuke Wakita
- Web page: https://patentgrep.com/patent/US12761400B2

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 17/10: of synthetic resin
- B32B 27/281: {comprising polyimides}
- H05K 5/03: Covers
- B32B 2250/02: 2 layers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/7376: Thickness
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

The present disclosure provides a stacked body comprising: a glass substrate; a joining layer; and a hard coating film, in this order, wherein the hard coating film includes a substrate layer and a hard coating layer, from a joining layer side; the joining layer is a layer configured to join the glass substrate and the substrate layer; a thickness of the glass substrate is 10 μm or more and 100 μm or less; and when a thickness of the hard coating layer is regarded as A, a thickness of the substrate layer is regarded as B, and a thickness of the joining layer is regarded as C, a ratio of (A+B) with respect to C is 3.0 or more and 500 or less.

## Claims

### Claim 1

A stacked body comprising:
a glass substrate;
a joining layer; and
a hard coating film, in this order,
wherein the hard coating film includes a substrate layer and a hard coating layer, from a joining layer side;
the joining layer is a layer configured to join the glass substrate and the substrate layer;
a thickness of the glass substrate is 10 μm or more and 100 μm or less; and
when a thickness of the hard coating layer is regarded as A, a thickness of the substrate layer is regarded as B, and a thickness of the joining layer is regarded as C, a ratio of (A+B) with respect to C is 3.0 or more and 500 or less;
a composite elastic modulus of the joining layer at 25° C. is 1 MPa or more and 6000 MPa or less; and
a glass transition temperature of the joining layer is −40° C. or more and 150° C. or less.

### Claim 2 (depends on 1)

The stacked body according to claim 1, wherein a composite elastic modulus of the substrate layer at 25° C. is 5.7 GPa or more.

### Claim 3 (depends on 1)

The stacked body according to claim 1, wherein the glass substrate includes a chemically strengthened glass.

### Claim 4 (depends on 1)

The stacked body according to claim 1, wherein the joining layer is a pressure-sensitive adhesive layer, or a heat-sensitive adhesive layer, or includes a cured product of a curable type adhesive composition.

### Claim 5 (depends on 1)

The stacked body according to claim 1, wherein the joining layer includes at least one kind selected from a group consisting of polyester resin, polyolefin resin, and urethane resin.

### Claim 6 (depends on 1)

The stacked body according to claim 1, wherein the stacked body includes an antireflection layer on the hard coating layer, on an opposite surface side to the substrate layer.

### Claim 7 (depends on 1)

The stacked body according to claim 1, wherein a crack, a fracture, or a peeling does not occur when the stacked body is folded into 180° repeatedly for 200,000 times so that a glass substrate side surface of the stacked body is on an outer side, a hard coating layer side surface of the stacked body is on an inner side, and a distance between opposing side portions of the stacked body is 10 mm.

### Claim 8 (depends on 1)

The stacked body according to claim 1, wherein the stacked body includes a protection film on the hard coating layer, on an opposite surface side to the substrate layer.

### Claim 9 (depends on 1)

A display device comprising:
a display panel, and
the stacked body according to claim 1 placed on an observer side of the display panel,
wherein the stacked body is placed so that a glass substrate side surface is adjacent to the display panel.

### Claim 10 (depends on 9)

The display device according to claim 9, wherein the display device is a foldable display.