# US 2023/0272178 A1 · Composite film having a functional layer and display device comprising same

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- Number: US 2023/0272178 A1
- Document ID: US20230272178A1
- Status: Published application
- Kind: A1
- Application number: 18/074,625
- Filed: 2022-12-05
- Published: 2023-08-31
- Earliest claimed: 2022-02-25
- Assignees: Skc Hi-Tech & Marketing Co., Ltd.
- Applicants: SKC hi-tech & marketing Co., Ltd.
- Inventors: Hyung-Woo CHO; Jun-Ki PARK; Seok-Jong WOO; Seung-Yong PYUN
- Web page: https://patentgrep.com/patent/US20230272178A1

## CPC

- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/044: Forming conductive coatings; Forming coatings having anti-static properties
- 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
- C08J 2379/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08J 2433/14: of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- 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)

## Abstract

The composite film according to an embodiment adopts an acrylate-based binder and an acrylamide-based monomer in a single functional layer for antistatic, antifouling, and chemical resistant functions to exhibit flexible characteristics without deteriorating the adhesive strength to a substrate; thus, it can be applied as a cover window of a flexible display device.

## Claims

### Claim 1

A composite film, which comprises a base film; and a functional layer formed on the base film, wherein the functional layer comprises an acrylate-based binder; and an acrylamide-based monomer.

### Claim 2 (depends on 1)

The composite film of claim 1, wherein the functional layer has a surface resistance of 1×1013Ω/□ or less and a cross-cut test result of 3B or more when measured for the surface of the functional layer according to the ASTM D3359 standard.

### Claim 3 (depends on 1)

The composite film of claim 1, wherein the water contact angle measured when an eraser for an abrasion resistance test is rubbed 3,000 times with a load of 1 kg in a state in which 10 μl of ethanol with a purity of 99.5% or more is applied to the surface of the functional layer is 950 or more.

### Claim 4 (depends on 1)

The composite film of claim 1, wherein the acrylamide-based monomer is employed in an amount of greater than 0 part by weight to 40 parts by weight relative to 100 parts by weight of the acrylate-based binder.

### Claim 5 (depends on 1)

The composite film of claim 1, wherein the acrylate-based binder comprises a urethane acrylate-based oligomer and an acrylate-based monomer.

### Claim 6 (depends on 1)

The composite film of claim 1, wherein the functional layer further comprises an antistatic agent.

### Claim 7 (depends on 6)

The composite film of claim 6, wherein the functional layer further comprises at least one selected from the group consisting of an antifouling agent, a UV absorber, and a photoinitiator.

### Claim 8 (depends on 1)

The composite film of claim 1, wherein the functional layer is directly formed on the surface of the base film.

### Claim 9 (depends on 1)

The composite film of claim 1, wherein the base film comprises at least one selected from the group consisting of a polymer film or ultra-thin glass (UTG).

### Claim 10

A display device, which comprises a display panel; and a cover window disposed on the front side of the display panel, wherein the cover window comprises a composite film, which comprises a base film; and a functional layer formed on the base film, and the functional layer comprises an acrylate-based binder; and an acrylamide-based monomer.