# US 2021/0239882 A1 · Optical laminate, transfer laminate, and method for manufacturing optical laminate

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- Number: US 2021/0239882 A1
- Document ID: US20210239882A1
- Status: Published application
- Kind: A1
- Application number: 16/972,254
- Filed: 2019-05-24
- Published: 2021-08-05
- Earliest claimed: 2018-06-08
- Assignees: Dexerials Corporation
- Applicants: Dexerials Corporation
- Inventors: Hiroshi SUGATA; Shunichi KAJIYA
- Web page: https://patentgrep.com/patent/US20210239882A1

## CPC

- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- B29D 11/0073: {Optical laminates}
- B29C 59/022: {characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor}
- B29C 59/046: {for layered or coated substantially flat surfaces}
- B29C 2059/023: {Microembossing}
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 7/023: Optical properties
- B32B 7/06: permitting easy separation
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 37/025: {Transfer laminating}
- B32B 2307/40: having particular optical properties
- B32B 2551/00: Optical elements
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

To form an optical body having a micro concave-convex structure on at least part of an adherend with high accuracy. Provided is an optical laminate including an adherend, a bonding layer formed on at least part of a surface of the adherend, and an optical body bonded to the adherend with the bonding layer. A micro concave-convex structure in which concavities and convexities are arranged at an average cycle less than or equal to a visible light wavelength is formed in at least one surface of the optical body. The bonding layer is provided on the other surface of the optical body. An initial 90° peeling force when peeling the optical body from a transfer body having an inverted concave-convex structure fitted in the micro concave-convex structure of the optical body is less than or equal to 70% of a 90° peeling force between the optical body and the bonding layer.

## Claims

### Claim 1

An optical laminate comprising:
an adherend;
a bonding layer formed on at least part of a surface of the adherend; and
an optical body bonded to the adherend with the bonding layer, wherein
a micro concave-convex structure in which concavities and convexities are arranged at an average cycle less than or equal to a visible light wavelength is formed in at least one surface of the optical body, and the bonding layer is provided on the other surface of the optical body, and
an initial 90° peeling force when peeling the optical body from a transfer body having an inverted concave-convex structure fitted in the micro concave-convex structure of the optical body is less than or equal to 70% of a 90° peeling force between the optical body and the bonding layer.

### Claim 2 (depends on 1)

The optical laminate according to claim 1, wherein
the optical body is peeled from a transfer laminate,
the transfer laminate has the optical body, the transfer body, and a covering body that covers one of the surfaces of the optical body that is located on a side where the transfer body is not provided, and
a 90° peeling force between the optical body and the covering body is smaller than a 90° peeling force between the optical body and the transfer body including tearing of the optical body.

### Claim 3

An optical laminate comprising:
an adherend;
a bonding layer formed on at least part of a surface of the adherend; and
an optical body bonded to the adherend with the bonding layer, wherein
a micro concave-convex structure in which concavities and convexities are arranged at an average cycle less than or equal to a visible light wavelength is formed in at least one surface of the optical body, and the bonding layer is formed on the other surface of the optical body, and
a 90° peeling force between the optical body and the bonding layer is more than or equal to 13 N/25 mm.

### Claim 4 (depends on 1)

The optical laminate according to claim 1, wherein
a total thickness of the optical body and the bonding layer is less than or equal to 15 μm.

### Claim 5 (depends on 1)

The optical laminate according to claim 1, wherein
the bonding layer is made of an ultraviolet-curing resin.

### Claim 6

A transfer laminate comprising:
an optical body, in at least one surface of which a micro concave-convex structure in which concavities and convexities are arranged at an average cycle less than or equal to a visible light wavelength is formed;
a transfer body having an inverted concave-convex structure fitted in the micro concave-convex structure of the optical body; and
a covering body that covers one of surfaces of the optical body that is located on a side where the transfer body is not provided, wherein
a 90° peeling force between the optical body and the covering body is smaller than a 90° peeling force between the optical body and the transfer body including tearing of the optical body.

### Claim 7 (depends on 6)

The transfer laminate according to claim 6, wherein
a surface of the inverted concave-convex structure has been subjected to mold release treatment.

### Claim 8

A method for manufacturing an optical laminate, comprising:
producing a transfer laminate having an optical body, in at least one surface of which a micro concave-convex structure in which concavities and convexities are arranged at an average cycle less than or equal to a visible light wavelength is formed, and a transfer body having an inverted concave-convex structure fitted in the micro concave-convex structure of the optical body;
forming a bonding layer yet to be cured on at least part of a surface of an adherend;
pressing the transfer laminate against the adherend such that an exposed surface of the optical body comes into contact with the bonding layer yet to be cured;
curing the bonding layer yet to be cured; and
peeling the optical body from the transfer body, wherein
an initial 90° peeling force when peeling the optical body from the transfer body is less than or equal to 70% of a 90° peeling force between the optical body and the bonding layer.

### Claim 9 (depends on 8)

The method for manufacturing an optical laminate according to claim 8, wherein
the transfer laminate further has a covering body that covers one of surfaces of the optical body that is located on a side where the transfer body is not provided,
in the method for manufacturing an optical laminate, the transfer laminate is pressed against the adherend after peeling the covering body from the transfer laminate, and
a 90° peeling force between the optical body and the covering body is smaller than a 90° peeling force between the optical body and the transfer body including tearing of the optical body.