# US 10,501,638 B2 · Hard coating film and image display device using the same

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- Number: US 10,501,638 B2
- Document ID: US10501638B2
- Status: Granted
- Kind: B2
- Application number: 15/448,898
- Filed: 2017-03-03
- Published: 2017-09-07
- Granted: 2019-12-10
- Earliest claimed: 2016-03-04
- Assignees: Dongwoo Fine-Chem Co., Ltd.
- Applicants: Dongwoo Fine-Chem Co., Ltd.
- Inventors: Geo San Lim; Dong Hwi Kim; Kwan Wook Song
- Web page: https://patentgrep.com/patent/US10501638B2

## CPC

- C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16}
- G02B 1/14: Protective coatings, e.g. hard coatings
- C08F 222/1065: {of alcohol terminated (poly)urethanes, e.g. urethane(meth)acrylates}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

The present invention relates to a hard coating film, and more particularly, to a hard coating film that includes a high elongation oligomer having an elastic modulus and elongation at break in a specific range on a transparent substrate, and thus can exhibit excellent impact resistance and bending resistance and can minimize the occurrence of a curl caused by cure shrinkage of a hard coating film, and an image display device using the same.

## Claims

### Claim 1

A hard coating film formed on a transparent substrate and consisting of one hard coating layer, wherein the hard coating layer comprises a cured product of a hard coating composition including a high elongation oligomer having an elastic modulus ranging from 10 to 3000 MPa and an elongation at break ranging from 30 to 150%, wherein the high elongation oligomer comprises urethane (meth)acrylate, wherein polymers in the cured product of a hard coating composition are homopolymers of the high elongation oligomer, wherein the cured product of the hard coating composition has a thickness ranging from 50 to 300 μm.

### Claim 2 (depends on 1)

The hard coating film according to claim 1, wherein the hard coating composition further comprises a solvent, a photoinitiator, an additive, or a combination thereof.

### Claim 3 (depends on 1)

The hard coating film according to claim 1, wherein the high elongation oligomer comprises 1 to 90 wt % of the entire hard coating composition.

### Claim 4 (depends on 1)

A window comprising the hard coating film according to claim 1.

### Claim 5 (depends on 4)

A flexible image display device comprising the window according to claim 4.