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Optical film, flexible display device and polyamide-imide resin

A polyamide-imide-based, flexible display device technology, applied in the field of optical films, can solve the problems of difficult use and easy cracking of front panel materials, and achieve the effect of high elastic modulus and high surface hardness

Pending Publication Date: 2021-08-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although glass has high transparency and can exhibit high hardness depending on the type, it is very rigid and easy to break, so it is difficult to use it as a front panel material of a flexible display device

Method used

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  • Optical film, flexible display device and polyamide-imide resin
  • Optical film, flexible display device and polyamide-imide resin
  • Optical film, flexible display device and polyamide-imide resin

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0290] The solvent used in the preparation of the varnish is not particularly limited as long as it can dissolve the aforementioned resin. Examples of the solvent include amide solvents such as N,N-dimethylacetamide and N,N-dimethylformamide; lactones such as γ-butyrolactone (GBL) and γ-valerolactone; Sulfur-based solvents such as dimethyl sulfone, dimethyl sulfoxide, and sulfolane; carbonate-based solvents such as ethylene carbonate and propylene carbonate; and combinations thereof (mixed solvents). Among these, amide-based solvents or lactone-based solvents are preferable. These solvents can be used individually or in combination of 2 or more types. In addition, water, alcohol-based solvents, ketone-based solvents, acyclic ester-based solvents, ether-based solvents, and the like may be contained in the varnish. The solid content concentration of the varnish is preferably 1 to 25% by mass, more preferably 5 to 20% by mass, and still more preferably 5 to 15% by mass.

[029...

Embodiment

[0356] Hereinafter, the present invention will be described in further detail through examples. Unless otherwise stated, "%" and "part" in an example mean mass % and a mass part. First, the evaluation method will be described.

[0357]

[0358] The modulus of elasticity of the polyamide-imide films obtained in Examples and Comparative Examples was measured using "AUTOGRAPH AG-IS" manufactured by Shimadzu Corporation. A film with a length and width of 10 mm was produced, and the S-S curve was measured under the conditions that the distance between chucks was 50 mm and the stretching speed was 10 mm / min, and the elastic modulus was calculated from the slope.

[0359]

[0360] As the surface hardness of the polyamide-imide films obtained in Examples and Comparative Examples, the pencil hardness of the film surface was used in accordance with JIS K 5600-5-4:1999. The load was set to 100 g, the scanning speed was set to 60 mm / min, and the presence or absence of damage was eva...

Embodiment 2

[0382] [Preparation of polyamideimide resin (2)]

[0383] Under a nitrogen atmosphere, TFMB and DMAc were added to a detachable flask equipped with a stirring blade so that the solid content of TFMB became 4.20% by mass, and 11.11mol% of 4,4'-(hexafluoro Propylene) diphenylamine (6FDAM), TFMB and 6FDAM were dissolved in DMAc while stirring at room temperature. Next, 6FDA was added to the flask so as to be 5.59 mol% relative to TFMB, and stirred at room temperature for 3 hours. Thereafter, after cooling to 10°C, OBBC at 10.17 mol% relative to TFMB and 6FBPDOC at 40.21 mol% relative to TFMB were added, and after stirring for 10 minutes, 5.59 mol% relative to TFMB was further added. OBBC and 6FBPDOC of 40.21 mol% relative to TFMB were stirred for 30 minutes. Thereafter, DMAc equivalent to the amount of DMAc added first was added, and after stirring for 10 minutes, 6FBPDOC was added so as to be 8.93 mol% relative to TFMB, and stirred for 2 hours. Next, 100.50 mol% of diisopropy...

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Abstract

Provided is an optical film having a high modulus of elasticity and surface hardness. The optical film comprises a polyamide-imide resin containing a structural unit represented by formula (1): (In formula (1), R1 and R2 independently represent a C1-12 alkyl group, a C1-12 alkoxy group, a C6-12 aryl group, a C6-12 aryloxy group, a C1-12 carbonyl group, a C1-12 oxycarbonyl group or a halogen group, where the hydrogen atoms contained in R1 and R2 are may each be independently substituted with a halogen atom, a C1-4 alkyl group, a C1-4 alkoxy group, a hydroxyl group, or a carboxyl group, and V represents a single bond, -O-, a diphenylmethylene group, a C1-12 linear, branched or alicyclic divalent hydrocarbon group, -SO2-, -S-, -CO-, -PO-, PO2-, -N(R30)- or -Si(R31)2-, where the hydrogen atoms contained in said hydrocarbon group may each be independently substituted with a halogen atom, and R30 and R31 each independently represent hydrogen atoms or C1-12 alkyl groups which may be substituted with halogen atoms, m represents an integer of 0-2, n represents an integer of 1-4, p represents an integer of 0-4, and q represents an integer of 0-4) and a structural unit represented by formula (2): (in formula (2) X represents a divalent organic group and Y represents a tetravalent organic group).

Description

technical field [0001] The present invention relates to an optical film including a polyamide-imide resin, a flexible display device including the optical film, and a polyamide-imide resin. Background technique [0002] Currently, display devices such as liquid crystal display devices and organic EL display devices are widely used not only in televisions but also in various applications such as mobile phones and smart watches. Conventionally, glass has been used as a front panel of such a display device. However, glass has high transparency and high hardness depending on the type, but on the other hand, it is very rigid and easily cracked, so it is difficult to use it as a front panel material of a flexible display device. [0003] Therefore, the utilization of polymer materials has been studied as a material to replace glass. A front panel made of a polymer material is expected to be used in various applications because it tends to exhibit flexibility. As one of polymer ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08G73/14G02F1/1333G09F9/00H01L27/32
CPCC08J5/18C08G73/14G02B1/04G02B5/30G06F3/041G09F9/301C08J2379/08
Inventor 增井建太朗宫本皓史望月胜纪畔见拓志坂本宏
Owner SUMITOMO CHEM CO LTD