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Hard coating film

A technology of hard coating film and top coating, applied in the direction of coating, polyester coating, etc., can solve the problems of insufficient flexibility, curling, inability to apply flexible displays, etc., to achieve excellent hardness properties, improve flexibility and curling properties.

Active Publication Date: 2020-10-16
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, when a foldable display substrate is coated on one side with a hard coat layer, due to the difference in thermal strain from the supporting substrate, under heat-resistant and moisture-resistant conditions Curl phenomenon will occur
Therefore, a method of forming a hard coat layer on both sides of a substrate has been proposed, but there is a problem in that it is not flexible enough to be applied to a flexible display

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1 to 8

[0145] Each resin composition was prepared by mixing the components described in Table 1 below. In this regard, based on 100 parts by weight of epoxy polysiloxane, 3 parts by weight of iodine-based Compound (Omnicat 250 TM , a product of BASF), 10 parts by weight of toluene as a solvent, and 0.2 parts by weight of a fluorine-based compound (RS-55 TM , a product of MEGAFACE).

[0146] [Table 1]

[0147]

[0148] In Table 1, the content unit "% by weight" is a value expressed as a percentage by weight of the corresponding component based on the total weight of the resin composition including epoxypolysiloxane, reactive monomer, and elastomer.

Embodiment 1 to 8

[0150] Each hard coat film in which a top coat layer and an undercoat layer were formed on top and bottom surfaces of a substrate, respectively, was produced by using each resin composition having the composition described in Table 2 below.

[0151] In detail, the second resin composition for forming an undercoat layer described in Table 2 below was applied to one surface of a PET substrate having a size of 15 cm×20 cm and a thickness of 50 μm, and then was irradiated by UV using a UV lamp ( Light dose: 400mJ / cm 2 ) for photocuring to form an undercoat layer. The first resin composition for forming a top coat layer described in Table 2 below was applied to the other surface opposite to the surface of the PET substrate on which the undercoat layer was formed, and then irradiated by UV using a UV lamp (light Dose: 400mJ / cm 2 ) was photocured to produce a hard coat film (thickness of top coat: 80 μm, thickness of undercoat: 100 μm, total thickness: 230 μm).

experiment example

[0159] The physical properties of the hard coat films produced in Examples 1 to 7 and Comparative Examples 1 and 2 were measured by the following methods, and the results are shown in Table 3 below.

[0160] 1) Pencil hardness (top coat)

[0161] Using a pencil hardness tester, according to standard JIS K5400, under a load of 1.0 kg, the top coat layer of each hard coating film produced in Examples 1 to 7 and Comparative Examples 1 and 2 was double-rubbed five times to determine whether The hardness at which scratches appear.

[0162] 2) Inward bending characteristics

[0163] While changing the inner radius of curvature (R) of the folded portion, each of the hard coating films produced in Examples and Comparative Examples was folded and unfolded 200,000 times so that the surface where the coating was formed was folded inward, in other words, when only the When the coating is formed on one surface of the substrate, the surface on which the coating is formed is folded inward,...

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Abstract

The present invention provides a hard coating film exhibiting improved flexibility and curl characteristics together with excellent hardness characteristics by respectively comprising at the upper andlower parts of a support substrate layer: an upper coating layer comprising a cured product of a first resin composition comprising an epoxy polysiloxane of the following chemical formula 1; and a lower coating layer comprising a cured product of a second resin composition, which comprises the epoxy polysiloxane of the following chemical formula 1 and an elastomer in a weight ratio of 95:5 to 60:40. [Chemical formula 1] (R1SiO3 / 2)a(R2SiO3 / 2)b(OR)c In chemical formula 1, R1, R2, R, a, b, and c are as defined in the specification.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Application No. 10-2018-0051357 filed on May 3, 2018 and Korean Patent Application No. 10-2019-0049058 filed on April 26, 2019, and its disclosure Incorporated herein in its entirety by reference. [0003] The present invention relates to hardcoat films exhibiting improved flexibility and curl characteristics as well as excellent hardness characteristics. Background technique [0004] In recent years, with the development of mobile devices such as smartphones and tablet computers, substrates for displays have been required to be thinner and lighter. Glass or tempered glass is generally used as a window or front panel of a display of a mobile device as a material having excellent mechanical properties. However, glass and tempered glass cause an increase in the weight of mobile devices due to their own weight, have problems of being e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/046C08J7/043C09D183/06C09D167/04C08J5/18
CPCC08J7/042C08J7/046C08J2367/02C08J2463/00C08J2483/04C08J2483/06C09D183/06C09D167/04C08J5/18C08J2467/04C08J7/16C08J2367/04C08J2369/00C08J2383/06C08J2383/07
Inventor 白承一李殷善金哈尼金佑翰
Owner LG CHEM LTD
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