Hard-coating film for display device, and display device comprising same

A technology for display devices and hard coatings, applied in coatings, static indicators, instruments, etc., can solve the problems of unsatisfactory continuous folding durability and achieve the effect of improving flexibility, high surface hardness and transparency

Inactive Publication Date: 2018-03-20
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, hardcoats using compositions of multifunctional acrylate monomers and urethane acrylates as main components or TAC or PET substrates have relatively high pencil hardness but tolerate only twice the mandrel in terms of flexibility. (Mandrel) test and show unsatisfactory continuous folding durability, which is important when actually used in display devices

Method used

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  • Hard-coating film for display device, and display device comprising same
  • Hard-coating film for display device, and display device comprising same
  • Hard-coating film for display device, and display device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0121] 1. Measurement method

[0122] [1] Thickness measurement

[0123] A micrometer (micrometer) (Mitutoyo Corporation) was used.

[0124] [2] Pencil hardness

[0125] The pencil scratch hardness was measured according to ASTM D3363 using a pencil hardness tester (Automatic Pencil Scratch Hardness Tester No. 553-M1, YASUDA SEIKI SEISAKUSHOL Ltd.) and a Mitsubishi pencil. Specifically, the highest pencil hardness was confirmed when the film was fixed on a glass plate of 2 mm thickness and the pencil was moved back and forth five times at a speed of 60 mm / minute with a vertical weight of 1 kg for 10 mm.

[0126] [3] Yellow Index (YI)

[0127] It is measured using a UV spectrophotometer (Konica Minolta Inc., cm-3600d) according to ASTM E313 standard.

[0128] [4] Modulus

[0129] The modulus was obtained by stretching a film sample of 10 mm width and 50 mm length at room temperature using an Instron 3365 at a speed of 50 cm / min, measuring each sample five times according t...

preparation Embodiment 1

[0137] Preparation Example 1: Manufacture of Polyimide Film

[0138] A polyimide (PI) substrate (50 μm thick) comprising the following condensation / polymerization compounds was prepared as follows: 4,4-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), biphenyl tetra Carboxylic dianhydride (BPDA) and bis(trifluoromethyl)-[1,1-biphenyl]4,4-diamine (TFDB) (molar ratio between diamine and anhydride = about 1:1, 6FDA:BPDA=1:3).

[0139] Fill 700g N,N-dimethylacetamide (DMAc) to the 2L three-neck round bottom flask that is equipped with stirrer, nitrogen inlet, dropping funnel, temperature controller and cooler as reactor, feed nitrogen simultaneously, And cooled to 0° C., then 22.2 g (0.05 mol) of 6FDA, 44.1 g (0.15 mol) of BPDA and 64 g (0.2 mol) of TFDB were dissolved therein. Subsequently, the solution was allowed to stand and stir at room temperature for 24 hours. When the reaction was completed, the polyamic acid solution thus obtained was cast on a glass substrate wi...

preparation Embodiment 2

[0141] Preparation Example 2: Manufacture of Polyimide Film

[0142]A polyimide (PI) substrate (PI-2, 50 μm thick) comprising the following condensation / polymerization compound was prepared according to a method similar to that of Preparation Example 1: 4,4-(hexafluoroisopropylidene) di-orthophenyl Diformic anhydride (6FDA), biphenyltetracarboxylic dianhydride (BPDA), and bis(trifluoromethyl)-[1,1-biphenyl]4,4-diamine (TFDB) (diamine and anhydride The molar ratio of = about 1:1, 6FDA:BPDA=4:1). The substrate had a transmission of 89.8%, a haze of 1.2%, a yellowness index of 1.5, a modulus of 4.2 GPa, and a pencil hardness of B (on glass).

[0143] Synthesis Example 1: Preparation of (meth)acrylate polymer (A1)

[0144] Put 229 parts by mass of methyl isobutyl ketone into a reactor equipped with a stirrer, a cooling tube, a dropping funnel, and a nitrogen inlet valve, and then heat to 110 °C while stirring, and then pass through the dropping funnel to gradually 309 parts by ...

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Abstract

Provided is a hard-coating film for a display device comprising: a plastic substrate of which the modulus of elasticity is 2.5 GPa and the glass transition temperature is at least 150 degrees; and a hard-coating layer provided on at least one surface of the plastic substrate, and, in the present invention, the plastic substrate has a thickness of no more than 100 mum and comprises: an active energy ray curable resin composition containing a (meth)acrylate polymer (A) having a hydroxyl group and a (meth)acryloyl group and having a weight-average molecular weight (Mw) in a range of between 3,000to 100,000, and an isocyanate compound (B); and, optionally, nano-sized inorganic particles dispersed in the resin composition, while the hard-coating film has a pencil hardness of 4H as measured byASTM D3363 under a weight of 1 kg and has a flexibility of a radius of curvature of 10 mm. Also provided is a display device comprising the hard-coating film.

Description

technical field [0001] Disclosed are a hard coat film for a display device that can be used in a display and has improved transparency, high hardness, and improved flexibility, and a display device having the hard coat film. Background technique [0002] With the diversification of portable terminals such as smartphones, tablet PCs, etc., high-performance and high-function display devices are required, and research and development on this are being actively conducted. For example, research and development on the commercial availability of thin, lightweight, and bendable or foldable, ie, flexible, display devices is ongoing. Currently, portable display devices use a rigid glass substrate to protect a display module such as a liquid crystal layer and at the same time prevent damage to the surface. However, the glass substrate has high hardness, but can be easily damaged by external impact and easily damaged. In addition, glass substrates do not satisfy the flexibility requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J5/18C09D133/14C09D133/12G02F1/133C08L79/08C08J7/043C08J7/046
CPCC08J5/18G02F1/133C08J2379/08C08J2433/14C08J2433/12C08J7/0427C09D133/08C08L79/08C08J2475/14C08J2433/10C08J7/043C08J7/046B32B27/281B32B27/308C08K5/29C08K5/101B32B2333/12C08K2201/011G02B1/14G02B1/16
Inventor 崔玹硕康永宰李在俊太田黑庸行胁田全规
Owner SAMSUNG ELECTRONICS CO LTD
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