CN-122029239-A - Curable composition for forming hard coat layer

Abstract

The present invention provides a curable composition for forming a hard coating layer, which has excellent abrasion resistance, excellent sliding property and excellent elastic modulus. The curable composition for forming a hard coat layer comprises (a) a polyfunctional (meth) acrylate monomer, (b) a surface modifier, (c) a polymerization initiator, and (d) a conductive polymer material, wherein the content of the conductive polymer material is 5.5 to 15 parts by mass relative to 100 parts by mass of the polyfunctional (meth) acrylate monomer. The hard coat layer, which is a cured product of the curable composition for forming a hard coat layer, has a water contact angle of 90 degrees or more on the surface after an abrasion resistance test, a dynamic friction coefficient of 0.30 or less on the surface of the hard coat layer, a surface energy of 35dyne/cm or less on the surface of the hard coat layer, a press-in hardness of 0.25GPa or more and less than 0.45GPa when measured by a nanoindentation method, and a press-in elastic modulus of 3GPa or more when measured by a nanoindentation method.

Inventors

• Shinto Kazuno

Assignees

• 日产化学株式会社

Dates

Publication Date

20260512

Application Date

20240924

Priority Date

20231016

Claims (9)

1. 1. A curable composition for forming a hard coat layer, comprising: (a) Polyfunctional (meth) acrylate monomers, (B) A surface modifier, (C) Polymerization initiator (D) A conductive polymer material, which is a polymer, The content of the conductive polymer material (d) is 5.5-15 parts by mass relative to 100 parts by mass of the polyfunctional (methyl) acrylate monomer (a); The water contact angle of the surface of the hard coating layer, which is a cured product of the curable composition for forming a hard coating layer, after the abrasion resistance test is 90 degrees or more, The dynamic friction coefficient of the hard coat layer surface is below 0.30, The surface energy of the hard coating layer is below 35dyne/cm, The indentation hardness of the hard coating layer is 0.25GPa or more and less than 0.45GPa when the surface of the hard coating layer is measured by a nano indentation method, and the indentation elastic modulus is 3GPa or more when the surface of the hard coating layer is measured by the nano indentation method.
2. 2. The curable composition for forming a hard coat layer according to claim 1, wherein the (d) conductive polymer material comprises poly (3, 4-ethylenedioxythiophene).
3. 3. The curable composition for forming a hard coat layer according to claim 2, wherein the conductive polymer material (d) comprises poly (3, 4-ethylenedioxythiophene) doped with polystyrene sulfonic acid.
4. 4. The curable composition for forming a hard coat layer according to claim 1, wherein the content of the conductive polymer material (d) is 5.5 to 10 parts by mass based on 100 parts by mass of the polyfunctional (meth) acrylate monomer (a).
5. 5. The curable composition for forming a hard coat layer according to claim 1, wherein the (b) surface modifier comprises a perfluoropolyether having at least 2 (meth) acryloyloxy groups at the terminal of a molecular chain comprising a poly (oxy Quan Fu alkylene) group represented by the following formula [1], In the above formula [1], PFPE represents a poly (oxy Quan Fu alkylene) group having at least one of a repeating unit- (CF 2 CF 2 O) -and a repeating unit- (CF 2 O) -and formed by bonding these repeating units by block bonding, random bonding, or block bonding and random bonding, Represents the bonding site to the-O-group of the urethane bond.
6. 6. The curable composition for forming a hard coat layer according to claim 5, wherein the (b) surface modifier comprises a perfluoropolyether having a group represented by the following formula [ A1] or formula [ A2] bonded to a terminal of a molecular chain comprising a poly (oxy Quan Fu alkylene) group represented by the formula [1] through the urethane bond, In the above formula [ A1] and the formula [ A2], R 1 and R 2 each independently represent a hydrogen atom or a methyl group, and the black dot represents a bonding site to the-NH-group of the urethane bond.
7. 7. The curable composition for forming a hard coat layer according to claim 1, further comprising (e) a solvent.
8. 8. A hard coat film comprising a film substrate and, on at least one surface thereof, a hard coat layer which is a cured product of the curable composition for forming a hard coat layer according to any one of claims 1 to 7.
9. 9. A display device comprising the hard coat film according to claim 8.

Description

Curable composition for forming hard coat layer Technical Field The present invention relates to a curable composition which is useful as a material for forming a hard coat layer which is applicable to the surface of various display devices such as flexible displays. More specifically, the present invention relates to a curable composition capable of forming a hard coat layer having excellent abrasion resistance, excellent sliding properties, and excellent elastic modulus. Background In recent years, touch panels that operate with fingers or pens while looking at a display are becoming popular in displays such as portable information terminals such as mobile phones and tablet computers, home electric appliances such as computers and televisions, and in-vehicle display panels. Conventionally, in order to prevent damage to a display, a protective glass, a plastic film, or the like provided with a hard coat layer having scratch resistance is applied to a surface of a touch panel. Since an operation is performed with a human finger, a pen, or the like, a touch panel provided with a hard coat layer is required to have stain resistance (e.g., hydrophobicity, oleophobicity) so that moisture from sweat and oil from sebum contained in a fingerprint are not easily adhered, and slidability to achieve a smooth writing experience. However, with the touch panel, friction may cause abrasion of the hard coat layer surface due to repeated contact with fingers, pens, etc., and even if the initial level of antifouling property is sufficient, the function tends to be lowered during use. Therefore, it is desirable that the hard coating layer have extremely high abrasion resistance to maintain the initial antifouling property. As a conventional method for forming a hard coat layer, there is a method in which a hard coat layer is obtained by applying a hard coat liquid containing a polyfunctional acrylate as a main agent, a photopolymerization initiator for causing a curing reaction of the polyfunctional acrylate by radical polymerization by active energy rays, and an organic solvent for diluting them to impart coatability to a substrate, removing the organic solvent by heating and drying, and then curing by active energy rays. However, the multifunctional acrylate material is liable to be charged, and there is a problem that dust adheres to the material during operation or use. In order to solve this problem, a method of adding various conductive materials to impart antistatic properties to a hard coat layer has been proposed (patent document 1). The hard coat film described in patent document 1 has been reported to have excellent antifouling properties by containing a fluorine-containing UV curable functional group-containing compound, a conductive polymer and a solvent in the hard coat layer, and by using an AFM (Atomic Force Microscope: atomic force microscope) (measurement conditions: non-Contact Mode, scan Size:1 μm×1 μm, scan Rate:1.0 Hz) to measure the surface roughness (Ra) value of the hard coat layer of 1nm or less. However, mechanical properties of a single layer of the hard coat layer, such as slidability of the hard coat layer represented by a coefficient of dynamic friction and elastic modulus of the hard coat layer represented by a modulus of indentation elasticity, have not been sufficiently studied. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2021-056515 Disclosure of Invention Problems to be solved by the invention The purpose of the present invention is to provide a curable composition for forming a hard coating layer, which has excellent abrasion resistance, excellent sliding properties, and excellent elastic modulus. Means for solving the problems The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a curable composition for forming a hard coat layer can form a hard coat layer having excellent abrasion resistance, excellent sliding properties and excellent elastic modulus, and have completed the present invention. The curable composition for forming a hard coat layer comprises (a) a polyfunctional (meth) acrylate monomer, (b) a surface modifier, (c) a polymerization initiator, and (d) a conductive polymer material, wherein the content of the conductive polymer material is 5.5 to 15 parts by mass relative to 100 parts by mass of the polyfunctional (meth) acrylate monomer. The hard coat layer, which is a cured product of the curable composition for forming a hard coat layer, has a water contact angle of 90 degrees or more on the surface after an abrasion resistance test, a dynamic friction coefficient of 0.30 or less on the surface of the hard coat layer, a surface energy of 35dyne/cm or less, a press-in hardness of 0.25GPa or more and less than 0.45GPa when the surface of the hard coat layer is measured by a nanoindentation method, and a press-in elastic modulus of 3GPa or more when the surfa