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Optical laminate and flexible display device including the same

A technology of optical laminates and chemical formulas, applied in optics, identification devices, optical components, etc., can solve problems such as high curing shrinkage, increased pressure of hard coating film, and severe curling

Active Publication Date: 2021-02-23
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this is applied to a thin film, there is a problem that the flexibility is lowered and the hard coat film is cracked.
In addition, a thin-film type acrylic hard coat film with high hardness and flexibility has been proposed, but when cured, the curing shrinkage rate is high, severe curling occurs, and there are limitations in expressing impact resistance.
[0005] In addition, as the hard coat layer of the base material of the display device for folding, the outer folded type in which the hard coat film is folded toward the outside has a higher pressure applied to the hard coat film than the inner folded type, and cracks are likely to occur.
Therefore, as a conventional hard coat composition, there is a limitation in realizing outer folds with a diameter of 10 mm or less and a low curvature.

Method used

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  • Optical laminate and flexible display device including the same
  • Optical laminate and flexible display device including the same
  • Optical laminate and flexible display device including the same

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0143]3-glycidoxypropyltrimethoxysilane (GPTMS, manufactured by Shin-Etsu Chemical Co., Ltd.), water (GPTMS: water = 1 mol: 3 mol) and toluene were added and stirred in a 1000 mL three-necked flask as a silane monomer. In the resulting mixed solution, 1 part by weight of a basic catalyst (TMAH) was added to 100 parts by weight of the silane monomer, and reacted at 100°C to prepare a modified silicone containing glycidoxypropyl group. (glycidoxypropyl modified silicone, hereinafter referred to as GP) 100 mole % polysiloxane (Mw: 2,700g / mol, Mn: 2,100g / mol, molecular weight distribution (Mw / Mn): 1.29, epoxy equivalent : 5.9g / eq)

[0144] (R 1 SiO 3 / 2 ) a (R 2 SiO 3 / 2 ) b (OR) c (1)

[0145] (In the above chemical formula 1, R 1 is glycidyl (in chemical formula 2, R'=each hydrogen atom, R"=methylene), a=1, b=0, c=0)

[0146] (a2) Polysiloxane: what was prepared according to the following synthesis example 2 was used.

Synthetic example 2

[0148] 250 g of 3-glycidoxypropyltrimethoxysilane (GPTMS, manufactured by Shin-Etsu Chemical Co., Ltd.) and methyltrimethoxysilane (MTMS, manufactured by Shin-Etsu Chemical Co., Ltd.) were placed in a 1000 mL three-necked flask as silane monomers. 140 g, water (GPTMS: MTMS: water = 1 mol: 3 mol: 0.97 mol) and 200 g of toluene were stirred. In the resulting mixed solution, 1 part by weight of a basic catalyst (TMAH) was added to 100 parts by weight of the silane monomer, and reacted at 100°C to prepare a modified silicone containing glycidoxypropyl group. (glycidoxypropyl modified silicone, hereinafter referred to as GP) 62 mole % polysiloxane (Mw: 2,300g / mol, Mn: 1,920g / mol, molecular weight distribution (Mw / Mn): 1.29, epoxy group equivalent : 2.95 / eq)

[0149] (R 1 SiO 3 / 2 ) a (R 2 SiO 3 / 2 ) b (OR) c (1)

[0150] (In the above formula, R 1 is glycidyl (in chemical formula 2, R'=each hydrogen atom, R"=methylene), R 2 is a methyl group, R is a hydrogen atom, a=0.62,...

Synthetic example 3

[0153] 350 g of 3-glycidoxypropyltrimethoxysilane (GPTMS, manufactured by Shin-Etsu Chemical Co., Ltd.) and methyltrimethoxysilane (MTMS, manufactured by Shin-Etsu Chemical Co., Ltd.) were placed in a 1000 mL three-necked flask as silane monomers. 61 g, water (GPTMS: MTMS: water == 1 mol: 0.3 mol: 0.3 mol) and 200 g of toluene were stirred. In the resulting mixed solution, 1 part by weight of a basic catalyst (TMAH) was added to 100 parts by weight of the silane monomer, and reacted at 100°C to prepare a modified silicone containing glycidoxypropyl group. (glyci doxypropyl modified silicone, hereinafter referred to as GP) 76 mol% polysiloxane (Mw: 3,200g / mol, Mn: 2,450g / mol, molecular weight distribution (Mw / Mn): 1.30, epoxy group Equivalent: 4.54 / eq)

[0154] (R 1 SiO 3 / 2 ) a (R 2 SiO 3 / 2 ) b (OR) c (1)

[0155] (In the formula, R 1 is glycidyl (in chemical formula 2, R'=each hydrogen atom, R"=methylene), R 2 is a methyl group, R is a hydrogen atom, a=0.76, b=0.23...

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Abstract

The present invention provides an optical laminate and a flexible display device comprising the same, wherein the optical laminate comprises: a support substrate layer; a hard coating layer, which ispositioned on at least one surface of the support substrate layer and contains a cured product of a hard coating composition; wherein the hard coating composition includes: polysiloxane, which includes 70mol% or more of constituent units including a glycidyl group-containing functional group; an elastomer; and a reactive monomer including one or more functional groups capable of crosslinking withthe polysiloxane, wherein the elastomer is contained in an amount of 5-80 parts by weight for per 100 parts by weight of the polysiloxane.

Description

technical field [0001] The present invention relates to an optical laminate and a flexible display device including the optical laminate. Background technique [0002] Recently, with the development of mobile devices such as smartphones and tablet PCs, thinner and more compact display devices have been required. For the display windows and front panels of such mobile devices, glass or tempered glass is generally used as a material with excellent mechanical properties. However, glass or tempered glass is heavy, leading to high weight of mobile devices, easy to break due to external impact, low flexibility, and has limitations in application to flexible or foldable display devices. [0003] As a material to replace such glass, plastic resins are being studied. Plastic resins are lightweight, less likely to be broken, and flexible, making them more suitable for lightweighting and softening of mobile devices. Typically polyethylene terephthalate (PET), polyethersulfone (PES),...

Claims

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Application Information

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IPC IPC(8): C08J7/046C09D183/06C09D167/04C09D169/00G02B1/14G09F9/30C08L79/08
CPCC09D183/06G02B1/14G09F9/301C08J2379/08C08L67/04C08L69/00
Inventor 金哈尼李殷善白承一金佑翰
Owner LG CHEM LTD
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