# US 12,000,979 B2 · Polarizer protective film and manufacturing method thereof

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- Number: US 12,000,979 B2
- Document ID: US12000979B2
- Status: Granted
- Kind: B2
- Application number: 16/622,587
- Filed: 2018-02-21
- Published: 2021-01-21
- Granted: 2024-06-04
- Earliest claimed: 2017-06-29
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jun Wuk Park; Yi Rang Lim; Sung In Kim; Kyoung Won Kim
- Web page: https://patentgrep.com/patent/US12000979B2

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- B29D 11/00: Producing optical elements, e.g. lenses or prisms (grinding or polishing of optical elements B24B; constructional form of optical elements G02B; {optical parts of spectacles G02C7/00})
- C08J 5/18: Manufacture of films or sheets
- C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50)
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- G02B 5/305: {including organic materials, e.g. polymeric layers}
- G02F 1/133528: {Polarisers}
- C09K 2323/03: Viewing layer characterised by chemical composition
- C09K 2323/035: Ester polymer, e.g. polycarbonate, polyacrylate or polyester
- 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)
- 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)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Provided are a polarizer protective film comprising a polymeric film and a coating layer formed on at least one surface of the polymeric film, where the coating layer has a plurality of concave embossed patterns and has a surface roughness of 2.0 nm to 20.0 nm, and a manufacturing method thereof.

## Claims

### Claim 1

A polarizer protective film comprising:
a polymeric film, and
a coating layer formed on at least one surface of the polymeric film,
wherein the coating layer comprises a plurality of concave embossed patterns and has a surface roughness (Ra) of 2.0 nm to 20.0 nm,
wherein the coating layer has a pencil hardness of H or higher under a load of 500 g,
wherein no scratch or grinding is observed on the surface of the coating layer after the coating layer is stacked in contact with a diffusion sheet, in a 50 mm×50 mm sample holder connected with a vibrator vibrating with an applied vibration strength of 2.8 Grms, at a frequency of 20-60 Hz under a load of 300 g, for 240 seconds,
wherein a thickness of the coating layer is 50 nm to 10 μm,
wherein a depth of the embossed patterns is 1 nm to 500 nm,
wherein a diameter of the embossed patterns is 0.1 μm to 20 μm,
wherein the coating layer is formed from a photocurable coating composition which comprises a photocurable binder, a silicon-based or fluorine-based compound, and a polymerization initiator,
wherein the silicon-based or fluorine-based compound is present in an amount from 0.2 parts by weight to 10 parts by weight with respect to 100 parts by weight of the photocurable binder,
wherein the silicon-based or fluorine-based compound is in a state of microphase separation that forms the plurality of concave embossed patterns, and
wherein a ratio of an outermost surface area of the plurality of concave embossed patterns with respect to a total area of the coating layer is in a range of 20% or more, and 80% or less.

### Claim 2 (depends on 1)

The polarizer protective film of claim 1, wherein the polymeric film includes one or more selected from the group consisting of a polyester, a polyethylene, a cyclic olefin polymer (COP), a cyclic olefin copolymer (COC), a polyacrylate (PAC), a polycarbonate (PC), a polymethylmethacrylate (PMMA), a polyimide (PI), a triacetylcellulose (TAC), and a cellulose.

### Claim 3

A method of manufacturing a polarizer protective film, the method comprising the steps of:
coating a photocurable coating composition comprising a photocurable binder, a silicon-based or fluorine-based compound, and a polymerization initiator onto at least one surface of a polymeric film;
heat-treating the polymeric film onto which the coating composition is coated; and
photo-curing the coating composition to form a coating layer comprising a plurality of concave embossed patterns and a surface roughness (Ra) of 2.0 nm to 20.0 nm,
wherein the coating layer has a pencil hardness of H or higher under a load of 500 g,
wherein no scratch or grinding is observed on the surface of the coating layer after the coating layer is stacked in contact with a diffusion sheet, in a 50 mm×50 mm sample holder connected with a vibrator vibrating with an applied vibration strength of 2.8 Grms, at a frequency of 20-60 Hz under a load of 300 g, for 240 seconds,
wherein a thickness of the coating layer is 50 nm to 10 μm,
wherein a depth of the embossed patterns is 1 nm to 500 nm,
wherein a diameter of the embossed patterns is 0.1 μm to 20 μm,
wherein the silicon-based or fluorine-based compound is present in an amount from 0.2 parts by weight to 10 parts by weight with respect to 100 parts by weight of the photocurable binder,
wherein the silicon-based or fluorine-based compound is in a state of microphase separation that forms the plurality of concave embossed patterns, and
wherein a ratio of an outermost surface area of the plurality of concave embossed patterns with respect to a total area of the coating layer is in a range of 20% or more, and 80% or less.

### Claim 4 (depends on 3)

The method of claim 3, wherein the heat treatment is performed at a temperature of 80° ° C. to 200° C.

### Claim 5 (depends on 3)

The method of claim 3, wherein the silicon-based compound is selected from the group consisting of an unreactive compound, a reactive compound, a resin, an oil, and a surfactant, each comprising a silicon group.

### Claim 6 (depends on 3)

The method of claim 3, wherein the fluorine-based compound is selected from the group consisting of an unreactive compound, a reactive compound, a resin, an oil, and a surfactant, each comprising a fluorine group.

### Claim 7 (depends on 3)

The method of claim 3, wherein the photocurable binder is a cationic curable binder, and the polymerization initiator is a cationic polymerization initiator.

### Claim 8 (depends on 3)

The method of claim 3, wherein the photocurable binder is a radical curable binder, and the polymerization initiator is a radical polymerization initiator.

### Claim 9 (depends on 7)

The method of claim 7, wherein the cationic curable binder is an epoxy-based compound.

### Claim 10 (depends on 9)

The method of claim 9, wherein the epoxy-based compound is an alicyclic epoxy-based compound.

### Claim 11 (depends on 3)

The method of claim 3, comprising a step of stretching the polymeric film onto which the coating composition has been applied.

### Claim 12 (depends on 11)

The method of claim 11, wherein the heat treatment step and the step of stretching the polymeric film onto which the coating composition has been applied are performed at the same time.