Optical laminate

An optical laminate and hard coating technology, applied in optics, optical elements, nonlinear optics, etc., can solve the problem of insufficient hardness, and achieve the effects of preventing interference spots, sufficient hardness, and simple manufacturing methods

Active Publication Date: 2016-05-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are cases where sufficient hardness is not obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0130] Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. The evaluation methods in the examples are as follows. In addition, in the examples, unless otherwise indicated, "parts" and "%" are based on weight.

[0131] (1) Refractive index

[0132] Using an Abbe refractometer (trade name: DR-M2 / 1550) manufactured by Atago Corporation, and selecting monobromonaphthalene as an intermediate solution, the refractive index of the base layer and the hard coat layer were measured.

[0133] (2) Thickness and penetration depth of hard coating

[0134] A black acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd., thickness 2 mm) was attached to the substrate layer side of the optical laminates obtained in the examples and comparative examples via an acrylic adhesive having a thickness of 20 μm. Then, using an instant multi-channel photometry system (manufactured by Otsuka Electronics Co., Ltd., trade ...

manufacture example 1

[0158] Production of base film A

[0159] Using a biaxial kneader, 100 parts by weight of the imidized MS resin (weight average molecular weight: 105,000) described in Production Example 1 of JP 2010-284840 A and a triazine-based ultraviolet absorber were mixed at 220°C (Manufactured by ADEKA, trade name: T-712) 0.62 parts by weight were mixed to prepare resin pellets. The obtained resin pellets were dried at 100.5 kPa and 100°C for 12 hours, and extruded from a T-die at a die temperature of 270°C using a uniaxial extruder to form a film (thickness 160 μm). Furthermore, the film was stretched in its conveying direction (thickness 80 μm) in an atmosphere of 150°C, and then stretched in a direction orthogonal to the film conveying direction in an atmosphere of 150°C to obtain a base film A with a thickness of 40 μm ((Meth)acrylic resin film). The obtained base film A had a transmittance of 8.5% for light with a wavelength of 380 nm, an in-plane retardation Re of 0.4 nm, and a th...

Embodiment 1

[0161] 80 parts of urethane acrylate oligomer (manufactured by Daicel-Cytec, product name "KRM8452", Mw=1200, number of functional groups: 10) as a curable compound and pentaerythritol triacrylate (Osaka Organic Chemical Industry Co., Ltd.) Manufacture, product name "Viscoat#300", Mw=298) 20 parts, and containing ZrO 2 Microparticle sol (manufactured by Nissan Chemical Company, product name "NanouseOZ-S30K", solid content: 30%, average particle size: 10nm, refractive index: 2.2, solvent: methyl isobutyl ketone) 100 parts, leveling agent (Manufactured by DIC Corporation, trade name: PC4100) 0.5 part, and 3 parts of photopolymerization initiator (manufactured by CibaJapan, trade name: Irgacure907) were mixed, and methyl isobutyl ketone was used so that the solid content concentration became 50% The dilution is performed to prepare a composition for forming a hard coat layer.

[0162] The obtained hard-coat layer formation composition was apply|coated on the base material film A obt...

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Abstract

Provided is an optical laminate which comprises a base layer and a hard coat layer, and has a sufficient hardness, while being prevented from interference irregularity. An optical laminate which comprises: a base layer that is formed of a thermoplastic resin film; and a hard coat layer that is formed by coating the thermoplastic resin film with a hard coat layer-forming composition containing a curable compound having a molecular weight of 600-2,500 and high-refractive-index fine particles having a refractive index of 1.50 or more. The hard coat layer has a permeation region that is formed by permeation of the hard coat layer-forming composition into the thermoplastic resin film. The high-refractive-index fine particles are segregated in the hard coat layer so that the concentration thereof is continuously decreased from the surface, on which the base layer is not arranged, in the thickness direction.

Description

Technical field [0001] The present invention relates to an optical laminate. Background technique [0002] Image display devices such as liquid crystal displays (LCD), cathode ray tube display devices (CRT), plasma displays (PDP), electroluminescence displays (ELD), etc. have the following situations, that is, if the surface is damaged due to contact from the outside , The visibility of the displayed image decreases. Therefore, in order to protect the surface of the image display device, an optical laminate including a base layer and a hard coat layer is used. [0003] In addition, for image display devices, it is required to reduce surface reflection caused by light irradiated from the outside and improve the visibility. In response to this requirement, it has been proposed to use an optical laminate having a configuration of [base material layer / hard coat layer / anti-reflection layer]. In the optical laminate of this configuration, from the viewpoint of reflectivity, the hard c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/14B32B27/18G02B1/11G02B5/30G02F1/1335
CPCB32B7/00B32B7/10B32B27/00B32B27/06B32B27/08B32B27/18B32B2255/00B32B2255/10B32B2255/26B32B2264/00B32B2307/40B32B2307/50G02B1/113G02B1/10G02B1/11G02B5/30
Inventor 柴田周作岸敦史仓本浩贵
Owner NITTO DENKO CORP
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