Polyimide film

A polyimide film, polyimide technology, applied in synthetic resin layered products, chemical instruments and methods, layered products, etc., can solve the problems of easy cracking and difficult to use as a flexible display, and achieve visual recognition. Excellent effect

Active Publication Date: 2018-08-07
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, glass that has been used as a front panel material for image display devices has high transparency and can exhibit high hardness depending on

Method used

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Examples

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Example Embodiment

[0187] Example

[0188] Hereinafter, the present invention will be described in more detail with reference to the embodiments. "%" and "part" in an example represent mass % and mass part unless otherwise specified. First, the evaluation method will be described.

[0189]

[0190] Based on JIS K7105:1981, the total light transmittance of the sample was measured using a fully automatic direct reading haze computer HGM-2DP manufactured by Suga Test Instruments.

[0191]

[0192] Gel permeation chromatography (GPC) assay

[0193] (1) Pretreatment method

[0194] After dissolving a sample in γ-butyrolactone (GBL) to prepare a 20 mass % solution, it was diluted 100 times with a DMF eluent and filtered through a 0.45 μm membrane filter, and the obtained solution was used as a measurement solution.

[0195] (2) Measurement conditions

[0196] Chromatographic column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mm I.D.×150mm×3 pieces)

[0197] Eluent: DMF (added with 10 mM lithium...

Example Embodiment

[0213] [Production example 1] Production of polyimide varnish (1) containing polyimide-based polymer (1)

[0214] In a nitrogen atmosphere, 1.25 g of isoquinoline was put into a reaction vessel equipped with a solvent trap and a filter and connected to a vacuum pump. Next, 375.00 g of γ-butyrolactone (GBL) and 104.12 g of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFMB) were put into the reaction container, and the mixture was subjected to Stir to dissolve. Furthermore, after adding 145.88 g of 4,4'-(hexafluoroisopropylidene)diphthalic dianhydride (6FDA) to the reaction container, the temperature was started in an oil bath while stirring the mixture.

[0215] The molar ratio of TFMB to 6FDA added was 1.00:0.99, and the monomer concentration in the mixture was 40% by mass. When the internal temperature of the reaction vessel reached 80°C, the pressure was reduced to 650 mmHg, and then the internal temperature was raised to 180°C. After the internal temperature reached 1...

Example Embodiment

[0216][Production Example 2] Polyimide Varnish (2) Containing Polyimide-Based Polymer (2)

[0217] As the polyimide varnish (2), "Neopulim (registered trademark) C6A20" manufactured by Mitsubishi Gas Chemical Co., Ltd. was used. "Neopulim C6A20" contains 22 mass % of the polyimide-based polymer (2) in a γ-butyrolactone solvent.

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Abstract

The invention relates to a polyimide film and is to provide an optic-film which can be used as a front panel of a flexible display and has excellent visuognosis of white color on frames. The polyimidefilm includes at least one polyimide high-molecular substance, yellow index (YI) being 0 < YI < 1.0.

Description

technical field [0001] The present invention relates to polyimide films. Background technique [0002] Currently, image display devices such as liquid crystal display devices and organic EL display devices are widely and effectively used not only in televisions but also in mobile phones and smart watches. With the expansion of such applications, image display devices (flexible displays) having flexible characteristics are required, and flexibility of each member thereof is required. [0003] The configuration of an image display device includes, in addition to display elements such as a liquid crystal display element or an organic EL display element, a polarizing plate, a retardation plate, a front panel, and the like. In order to realize a flexible display, all the above-mentioned members need to have a flexible characteristic. When the components of an image display device are made of a flexible polymer material (for example, Patent Document 1), since the components are ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/08C08K3/36C08K5/18
CPCC08J5/18C08K5/18C08K3/36C08J2379/08B32B27/281C08L79/08C08K5/17C08L2201/10
Inventor 安井未央片波岚樱井孝至
Owner SUMITOMO CHEM CO LTD
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