# US 2021/0276312 A1 · Hard coating film having multilayer-structure, and polyimide film comprising same

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- Number: US 2021/0276312 A1
- Document ID: US20210276312A1
- Status: Published application
- Kind: A1
- Application number: 17/321,453
- Filed: 2021-05-16
- Published: 2021-09-09
- Earliest claimed: 2020-03-03
- Assignees: Kolon Industries, Inc.
- Applicants: Kolon Industries, Inc.
- Inventors: Pil Rye Yang; Dong Hee Lee; Sang Hyun Ahn; Hang Geun Kim; Seong Hoon Baek; Byung Joon An
- Web page: https://patentgrep.com/patent/US20210276312A1

## CPC

- B32B 27/08: of synthetic resin
- C09D 183/14: in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C09D183/10 takes precedence)
- B32B 7/022: Mechanical properties
- B32B 27/281: {comprising polyimides}
- B32B 27/283: {comprising polysiloxanes}
- C08G 77/04: Polysiloxanes
- B32B 2307/412: Transparent
- B32B 2307/536: Hardness
- C08G 77/50: by carbon linkages
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The present invention relates to a hard coating film having a multilayer-structure and, specifically, to a hard coating film having a multilayer-structure, which has a low Vickers hardness (Hv) value while having an excellent scratch resistance together with flexibility.

## Claims

### Claim 1

A hard coating film having a structure in which a highly bendable layer and a high-hardness layer are stacked on a substrate in that order,
wherein the highly bendable layer has a Vickers hardness (Hv) of 40 or less,
the high-hardness layer has a Vickers hardness (Hv) of 55 or more, and
the hard coating film including the highly bendable layer and the high-hardness layer stacked on the substrate in that order has a Vickers hardness (Hv) of 20 to 65, and
wherein the highly bendable layer comprises a siloxane resin obtained by polymerizing a compound comprising: at least one alkoxysilane selected from an alkoxysilane represented by the following Formula 1 and an alkoxysilane represented by the following Formula 2; and a diol represented by the following Formula 3:
R1n(OR2)4-n <Formula 1>
wherein R2 is a C1-C3 linear, branched or cyclic alkyl group substituted with epoxy or acryl, R2 is a C1-C8 linear, branched or cyclic alkyl group, and n is an integer of 1 to 3,
Si(OR3)4 <Formula 2>
wherein R3 represents a C1 to C4 linear or branched alkyl group,
HO(CH2)nOH <Formula 3>
wherein n is an integer of 1 to 10.

### Claim 2 (depends on 1)

The hard coating film according to claim 1, wherein the substrate is a transparent polyimide substrate.

### Claim 3 (depends on 1)

The hard coating film according to claim 1, wherein the hard coating film has a reverse R of 2.0 or less.

### Claim 4 (depends on 1)

The hard coating film according to claim 1, wherein the hard coating film has a tensile fracture point of 6% or more.

### Claim 5 (depends on 1)

The hard coating film according to claim 1, wherein the hard coating film has a bendability (EIT (indentation modulus)/HIT (indentation hardness) of 8 or more.

### Claim 6 (depends on 1)

The hard coating film according to claim 1, wherein the hard coating film has a transmittance of 90% or more and a haze of 1.0% or less.

### Claim 7 (depends on 1)

The hard coating film according to claim 1, wherein the highly bendable layer has a thickness of 1 to 200 μm, and the high-hardness layer has a thickness of 30 μm or less.

### Claim 8 (depends on 1)

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