# US 2022/0033689 A1 · Double-sided adhesive layer-equipped optical laminate

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- Number: US 2022/0033689 A1
- Document ID: US20220033689A1
- Status: Published application
- Kind: A1
- Application number: 17/276,946
- Filed: 2019-09-26
- Published: 2022-02-03
- Earliest claimed: 2018-09-28
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Daisuke Hattori; Atsushi Kishi
- Web page: https://patentgrep.com/patent/US20220033689A1

## CPC

- C09J 7/385: {Acrylic polymers}
- B32B 7/022: Mechanical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/308: {comprising acrylic (co)polymers}
- C09J 7/255: {Polyesters}
- C09J 7/29: Laminated material (metallised plastics C09J7/22)
- G02B 1/048: {characterised by the cladding material}
- G02B 1/111: using layers comprising organic materials
- B32B 2250/05: 5 or more layers
- B32B 2305/02: Cellular or porous
- B32B 2307/412: Transparent
- B32B 2307/732: Dimensional properties
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- B32B 2551/00: Optical elements
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2301/124: the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
- C09J 2301/302: the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
- C09J 2301/312: parameters being the characterizing feature
- C09J 2400/143: in the substrate
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2467/006: in the substrate
- G02B 2207/107: Porous materials, e.g. for reducing the refractive index
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

There is provided an optical laminate with pressure-sensitive adhesive layers on both surfaces. The optical laminate comprises: a first substrate; a first low-refractive index layer formed on the first substrate; a first pressure-sensitive adhesive layer arranged so as to be adjacent to the first low-refractive index layer; a second low-refractive index layer arranged so as to be adjacent to the first pressure-sensitive adhesive layer; a second substrate having formed thereon the second low-refractive index layer; and a second pressure-sensitive adhesive layer and a third pressure-sensitive adhesive layer serving as outermost layers. The first low-refractive index layer and/or the second low-refractive index layer has a porosity of 50% or more, the first pressure-sensitive adhesive layer has a storage modulus of elasticity of from 1.3×105 (Pa) to 1.0×107 (Pa), and the second pressure-sensitive adhesive layer and/or the third pressure-sensitive adhesive layer has a storage modulus of elasticity of 1.0×105 (Pa) or less.

## Claims

### Claim 1

An optical laminate with pressure-sensitive adhesive layers on both surfaces, comprising:
a first substrate;
a first low-refractive index layer formed on the first substrate;
a first pressure-sensitive adhesive layer arranged so as to be adjacent to the first low-refractive index layer;
a second low-refractive index layer arranged so as to be adjacent to the first pressure-sensitive adhesive layer;
a second substrate having formed thereon the second low-refractive index layer; and
a second pressure-sensitive adhesive layer and a third pressure-sensitive adhesive layer se zing as outermost layers,
wherein at least one of the first low-refractive index layer or the second low-refractive index layer has a porosity of 50% of more,
wherein the first pressure-sensitive adhesive layer has a storage modulus of elasticity of from 1.3×105 (Pa) to 1.0×107 (Pa), and
wherein at least one of the second pressure-sensitive adhesive layer or the third pressure-sensitive adhesive layer has a storage modulus of elasticity of 1.0×105 (Pa) or less.

### Claim 2 (depends on 1)

The optical laminate with pressure-sensitive adhesive layers on both surfaces according to claim 1, wherein the first low-refractive index layer and the second low-refractive index layer each have a porosity of 50% or more.

### Claim 3 (depends on 1)

The optical laminate with pressure-sensitive adhesive layers on both surfaces according to claim 1, wherein the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer each have a storage modulus of elasticity of 1.0×105 (Pa) or less.

### Claim 4 (depends on 1)

The optical laminate with pressure-sensitive adhesive layers on both surfaces according to claim 1, wherein one of the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer has a storage modulus of elasticity of 1.0×105 (Pa) or less, and another thereof has a storage modulus of elasticity of 1.3×105 (Pa) or more.

### Claim 5 (depends on 1)

The optical laminate with pressure-sensitive adhesive layers on both surfaces according to claim 1, wherein the first low-refractive index layer and the second low-refractive index layer each have a refractive index of from 1.01 to 1.30.

### Claim 6

An optical laminate with pressure-sensitive adhesive layers on both surfaces, comprising:
a first substrate;
a first low-refractive index layer formed on the first substrate;
a first pressure-sensitive adhesive layer arranged so as to be adjacent to the first low-refractive index layer;
a second low-refractive index layer arranged so as to be adjacent to the first pressure-sensitive adhesive layer;
a second substrate having formed thereon the second low-refractive index layer; and
a second pressure-sensitive adhesive layer and a third pressure-sensitive adhesive layer serving as outermost layers,
wherein the first low-refractive index layer and the second low-refractive index layer each have a porosity of 50% or more and a refractive index of from 1.01 to 1.30, and each are formed of one or a plurality of kinds of constituent units each forming a fine pore structure, and the constituent units are chemically bonded to each other through a catalytic action,
wherein the first pressure-sensitive adhesive layer has a storage modulus of elasticity of from 1.3×105 (Pa) to 1.0×107 (Pa), and a pressure-sensitive adhesive for forming the first pressure-sensitive adhesive comprises a (meth)acrylic polymer as a base polymer, and a monomer for forming the (meth)acrylic polymer comprises a heterocycle-containing (meth)acrylate, and
wherein the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer each have a storage modulus of elasticity of 1.0×105 (Pa) or less.