# US 12,216,300 B2 · Optical laminate comprising an optical functional layer and a porous layer

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- Number: US 12,216,300 B2
- Document ID: US12216300B2
- Status: Granted
- Kind: B2
- Application number: 17/440,569
- Filed: 2020-01-31
- Published: 2022-05-12
- Granted: 2025-02-04
- Earliest claimed: 2019-03-29
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Na Young Shin; Kyun Il Rah; Jin Seok Byun; Yeong Rae Chang
- Web page: https://patentgrep.com/patent/US12216300B2

## CPC

- B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer}
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- B32B 5/16: characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)}
- B32B 5/30: one layer {being formed of particles, e.g. chips,} granules, powder
- B32B 7/023: Optical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 23/08: of synthetic resin
- B32B 23/20: comprising esters
- B32B 27/08: of synthetic resin
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- C08F 22/10: Esters
- C08J 5/18: Manufacture of films or sheets
- C08K 3/36: Silica
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/20: Inorganic coating
- B32B 2255/26: Polymeric coating
- B32B 2260/025: Particulate layer
- B32B 2260/046: Synthetic resin
- B32B 2264/102: Oxide or hydroxide
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2307/514: Oriented
- B32B 2307/712: Weather resistant
- B32B 2307/732: Dimensional properties
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- C08J 2323/02: not modified by chemical after treatment
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2333/08: Homopolymers or copolymers of acrylic acid esters
- G02B 2207/107: Porous materials, e.g. for reducing the refractive index
- 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
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present disclosure relates to an optical laminate or a reddening-resistant layer. The present disclosure can provide an optical laminate that does not cause a so-called reddening phenomenon even when driven or maintained under extremely harsh conditions (e.g., very high temperature conditions), or a reddening-resistant layer applied thereto.

## Claims

### Claim 1

An optical laminate, comprising:
an optical functional layer; and
a porous layer formed on at least one side of the optical functional layer,
wherein the porous layer comprises a surface having a surface area ratio of 0.02 or more as measured by an atomic force microscope,
wherein the porous layer comprises a binder and hollow particles,
wherein the binder comprises a polymer derived from a polyfunctional acrylate having 2 to 10 polymerizable functional groups,
wherein the hollow particles have a D10 particle diameter in a range from 25 to 50 nm, a D50 particle diameter in a range from 50 to 100 nm and a D90 particle diameter in a range from 100 nm to 200 nm in a weight cumulative curve of particle size distribution.

### Claim 2 (depends on 1)

The optical laminate according to claim 1, wherein an absolute value of a change in an amount of color coordinate a* of CIE L*a*b* according to Equation 1 is 2 or less:
Δa*=a*a−a*i [Equation 1]
wherein Δa* is the change in the amount of the color coordinate a*, a*a is a color coordinate a* of the optical laminate after maintaining the optical laminate at 105° C. for 250 hours under a state where both top and bottom surfaces of the optical laminate come in contact with glass substrates and a*i is a color coordinate a* of the optical laminate before maintaining the optical laminate at 105° C. for 250 hours.

### Claim 3 (depends on 1)

The optical laminate according to claim 1, wherein an absolute value of a change in an amount of transmittance according to Equation 2 is 5 or less:
ΔTs=Ta−Ti [Equation 2]
wherein ΔTs is the change in the amount of the transmittance, Ta is a transmittance of the optical laminate after maintaining the optical laminate at 105° C. for 250 hours under a state where both top and bottom surfaces of the optical laminate come in contact with glass substrates, and Ti is a transmittance of the optical laminate before maintaining the optical laminate at 105° C. for 250 hours.

### Claim 4 (depends on 1)

The optical laminate according to claim 1, wherein the optical functional layer is an iodine-based polarizing layer.

### Claim 5 (depends on 1)

The optical laminate according to claim 1, wherein the porous layer has reflectance of 2% or more with respect to light having a wavelength of 800 nm to 1300 nm.

### Claim 6 (depends on 1)

The optical laminate according to claim 1, wherein the porous layer exhibits at least one peak within a scattering vector range of 0.06 to 0.209 nm−1 in a log value graph of scattering intensity of small angle X-ray scattering.

### Claim 7 (depends on 1)

The optical laminate according to claim 1, wherein an A value satisfying Equation 6 of the porous layer is 1.5 or less, a B value satisfying Equation 6 of the porous layer is from 0 to 0.01 and a C value satisfying Equation 6 of the porous layer is from 0 to 0.001:
n
⁡
(
λ
)
=
A
+
B
λ
2
+
C
λ
4
[
Equation
⁢
⁢
6
]
wherein n(λ) is the refractive index of the porous layer at a wavelength of λ, and λ is any one wavelength in a range of 300 to 1800 nm.

### Claim 8 (depends on 1)

The optical laminate according to claim 1, wherein the porous layer does not comprise solid particles.

### Claim 9 (depends on 1)

The optical laminate according to claim 1, wherein the porous layer has a thickness of 200 nm or more.

### Claim 10 (depends on 1)

The optical laminate according to claim 1, wherein the porous layer does not form a surface of an outermost layer in the optical laminate.

### Claim 11 (depends on 1)

The optical laminate according to claim 1, wherein the distance between the porous layer and the optical functional layer is 90 μm or less.