Optical film and flexible display device

A flexible display device and optical film technology, applied in optics, identification devices, optical elements, etc., can solve the problems of being easy to break and difficult to be used as a flexible display device

Pending Publication Date: 2022-06-07
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the front panel of such a display device, glass is used, but glass is very rigid and easily cracked, so it is difficult to use as a front panel material for a flexible display device

Method used

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  • Optical film and flexible display device
  • Optical film and flexible display device
  • Optical film and flexible display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0276] The solvent used for the preparation of the resin varnish is not particularly limited as long as it can dissolve the above-mentioned resin. Examples of the solvent include amide-based solvents such as DMAc and DMF; lactone-based solvents such as γ-butyrolactone and γ-valerolactone; and sulfur-containing solvents such as dimethyl sulfone, dimethyl sulfoxide, and sulfolane. ; Carbonate-based solvents such as ethylene carbonate and propylene carbonate; and combinations thereof. Among them, amide-based solvents or lactone-based solvents are preferable. These solvents can be used alone or in combination of two or more. In addition, water, alcohol-based solvents, ketone-based solvents, acyclic ester-based solvents, ether-based solvents, and the like may be contained in the resin varnish. The solid content concentration of the varnish is preferably 1 to 25% by mass, more preferably 5 to 15% by mass. In addition, in this specification, the solid content of a varnish shows th...

Embodiment

[0327] Hereinafter, the present invention will be described in further detail through examples. Unless otherwise specified, "%" and "part" in an example mean mass % and a mass part. First, the evaluation method will be described.

[0328]

[0329] The yield strength of the optical film obtained in the Example and the comparative example was measured using "Autograph AG-IS" manufactured by Shimadzu Corporation. A film having a width of 10 mm in length and width was produced, and the stress-distortion curve (S-S curve) was measured under the conditions of a distance between chucks of 50 mm and a stretching speed of 10 mm / min.

[0330] 1. S-S curve data collation

[0331] 10 points were sampled continuously from the measurement starting point in the S-S curve, and fitted to a quadratic function by the least square method. Then, by fitting a quadratic function in the sampling range of 10 points until it becomes an upwardly convex shape, one point is removed from the left side...

Synthetic example 1

[0361]

[0362]Under a nitrogen atmosphere, TFMB and DMAc, which was strictly dehydrated to a water content of 700 ppm or less, were added to a separable flask equipped with a stirring blade so that the solid content of TFMB became 5.13% by mass, and TFMB was dissolved in DMAc while stirring at room temperature. . Next, 6FDA and TAHMBP were added to the flask so as to be 20.20 mol% each with respect to TFMB, and stirred at room temperature for 16 hours. Then, after cooling to 10° C., TPC was added so as to be 27.27 mol % with respect to TFMB, and after stirring for 10 minutes, TPC was further added so as to be 27.27 mol % with respect to TFMB, and stirred for 30 minutes. Then, after adding DMAc in the same amount as the first added DMAc and stirring for 10 minutes, TPC was added so as to become 6.06 mol% with respect to TFMB, and stirred for 2 hours. Next, diisopropylethylamine, 4-picoline, and acetic anhydride were added to the flask so that they were 60.61 mol%, 60.61 mol...

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Abstract

Provided is an optical film having low yellowness and excellent folding resistance. The optical film contains a polyimide-based resin, and has a yield strength in a tensile test of 81 MPa or more and a yellowness of less than 3.0.

Description

technical field [0001] The present invention relates to an optical film containing a polyimide resin and a flexible display device including the optical film. Background technique [0002] Display devices such as liquid crystal display devices and organic EL display devices are widely used in various applications such as mobile phones and smart watches. Glass is used as a front panel of such a display device, but glass is very rigid and easily cracked, so it is difficult to use as a front panel material of a flexible display device. Therefore, an optical film using polymers such as polyimide-based resins and polyamide-imide-based resins has been studied as one of materials that replace glass (Patent Documents 1 and 2). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2014 / 046180 [0006] Patent Document 2: International Publication No. 2016 / 152459 Contents of the invention [0007] The problem to be solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J5/18C08G73/10G02B5/30G09F9/30
CPCC08J5/18C08G73/1007C08G73/1039C08G73/1067G09F9/301G02B5/3083C08J2379/08G09F9/00G02B5/30C08G73/10C08G73/14H10K59/40
Inventor 宫本皓史江川贵将
Owner SUMITOMO CHEM CO LTD
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