# US 10,768,351 B2 · Optical laminate

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- Number: US 10,768,351 B2
- Document ID: US10768351B2
- Status: Granted
- Kind: B2
- Application number: 15/075,571
- Filed: 2016-03-21
- Published: 2016-09-29
- Granted: 2020-09-08
- Earliest claimed: 2015-03-27
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Mitsuru Suzuki
- Web page: https://patentgrep.com/patent/US10768351B2

## CPC

- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 5/305: {including organic materials, e.g. polymeric layers}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided is an optical laminate including a resin layer and an adhesive layer, and being excellent in adhesiveness between these layers. The optical laminate includes: a resin layer; an adhesive layer arranged on at least one side of the resin layer; and an intermediate layer formed between the resin layer and the adhesive layer, the intermediate layer containing at least part of a material constituting the resin layer and at least part of a material constituting the adhesive layer, in which the intermediate layer has a thickness of from 20 nm to 200 nm. In one embodiment, the resin layer includes a resin film having optical anisotropy.

## Claims

### Claim 1

An optical laminate, comprising:
a resin layer;
an adhesive layer arranged on at least one side of the resin layer; and
an intermediate layer formed between the resin layer and the adhesive layer, the intermediate layer containing at least part of a material constituting the resin layer and at least part of a material constituting the adhesive layer,
wherein the resin layer is formed from a cycloolefin-based resin film or a polycarbonate-based resin film,
wherein the adhesive layer has a thickness of from 0.5 μm to 2 μm,
wherein the intermediate layer has a thickness of from 20 nm to 200 nm, and
wherein the thickness of the intermediate layer is from 2% to 10.8% of the thickness of the adhesive layer.

### Claim 2 (depends on 1)

The optical laminate according to claim 1, wherein the resin layer includes a resin film having optical anisotropy.

### Claim 3 (depends on 1)

The optical laminate according to claim 1, further comprising an optical functional layer arranged on a side of the adhesive layer opposite to the resin layer, wherein the optical functional layer comprises one of a solidified layer of a liquid crystal material and a cured layer thereof.

### Claim 4 (depends on 3)

The optical laminate according to claim 3, wherein the optical functional layer is formed by transfer.

### Claim 5 (depends on 1)

A circularly polarizing plate, comprising the optical laminate of claim 1.

### Claim 6 (depends on 1)

A method of producing the optical laminate of claim 1, the method comprising:
applying a composition for forming an adhesive layer containing a curable adhesive onto a resin film to form an applied layer; and
curing the applied layer,
a time period from an end of the formation of the applied layer to initiation of curing treatment being from 10 seconds to 250 seconds.