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Optical film

A technology of optical film and scattered light, applied in the field of optical film, can solve the problem of insufficient material and achieve the effect of excellent visual recognition

Active Publication Date: 2020-04-07
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not have sufficient materials for the recent demands for miniaturization, thinning, light weight and flexibility.

Method used

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  • Optical film
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0174] Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise specified, "%" and "part" in an example mean mass % and a mass part. First, the evaluation method will be described.

[0175]

[0176]Gel permeation chromatography (GPC) measurement was performed using liquid chromatography LC-10ATvp manufactured by Shimadzu Corporation.

[0177] (1) Pretreatment method

[0178] The polyimide-based resins obtained in Production Examples 1 to 4 were dissolved in γ-butyrolactone (GBL) to prepare a 20% by mass solution, then diluted to 100 times with a DMF eluent, and 0.45 μm membrane filter, and the resulting solution was used as a measurement solution.

[0179] (2) Measurement conditions

[0180] Column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mm I.D.×150mm×3 pieces)

[0181] Eluent: DMF (added with 10mmol of lithium bromide)

[0182] Flow: 0.6mL / min

[0183] Detector: RI detector

[0184] Column temperature: 40°C

[0185] In...

manufacture example 1

[0233] [Manufacture example 1: Manufacture of polyimide resin (1)]

[0234]Prepare a separable flask equipped with a silicone tube, a stirring device and a thermometer, and an oil bath. 75.6 g of 4,4'-(hexafluoroisopropylidene) diphthalic dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diphthalic acid dianhydride (6FDA) were put into the flask. Aminobiphenyl (TFMB) 54.5g. While stirring this at 400 rpm, 530 g of N,N-dimethylacetamide (DMAc) was added, and stirring was continued until the content of the flask became a uniform solution. Next, stirring was continued for another 20 hours, adjusting with an oil bath so that the temperature in a container may be in the range of 20-30 degreeC, it was made to react, and polyamic acid was produced|generated. After 30 minutes, the stirring speed was changed to 100 rpm. After stirring for 20 hours, the temperature of the reaction system was returned to room temperature, and 650 g of DMAc was added to adjust the polymer concentra...

manufacture example 2

[0235] [Manufacture example 2: Manufacture of polyimide resin (2)]

[0236] Except having changed reaction time into 16 hours, it carried out similarly to manufacture example 1, and produced polyimide resin (2). The weight average molecular weight of the obtained polyimide resin (2) was 280,000, and the imidization rate was 98.3%.

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Abstract

The present invention addresses the problem of providing an optical film having excellent visibility in the wide-angle direction. [Solution] An optical film which contains at least one resin selectedfrom the group consisting of polyimide-based resins and polyamide-based resins, and which satisfies formula (1). In formula (1), Ts represents a scattered light ratio (%) and is defined as Ts = Td / Tt* 100, and Td and Tt each represent a diffused light transmittance (%) and a total light transmittance (%) measured in accordance with JIS K-7136. 0 < = Ts < = 0.35 (1).

Description

technical field [0001] The present invention relates to an optical film usable as a front panel of a flexible display device, and a flexible display device including the optical film. Background technique [0002] Conventionally, glass has been used as a material for display components such as solar cells and image display devices. However, it does not have a sufficient material to meet the demands for miniaturization, thinning, weight reduction, and flexibility in recent years. Therefore, various films have been studied as substitute materials for glass. Such a film includes, for example, an optical film made of a polyimide-based resin (for example, Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2009-215412 Contents of the invention [0006] The problem to be solved by the invention [0007] When an optical film is applied to a transparent member such as a front panel of a flexibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10G02B1/14G02B1/04G09F9/30
CPCG02B1/10G02B1/14G02B1/04G09F9/301B32B7/023B32B27/08B32B27/281B32B27/34C08J5/18G02B5/30G06F3/041G02F1/1335B32B2307/42C08J2377/00
Inventor 大松一喜福井仁之唐泽真义
Owner SUMITOMO CHEM CO LTD