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Optical film and method for producing the same

A technology of optical film and light absorption, applied in the field of optical film, can solve problems such as easy cracking, achieve low yellowness, high transparency, and improve surface hardness

Active Publication Date: 2022-05-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass has high transparency and can exhibit high hardness depending on the type of glass, but on the other hand, it is very rigid and easy to break, so it is difficult to use as a front panel material for flexible displays

Method used

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  • Optical film and method for producing the same
  • Optical film and method for producing the same
  • Optical film and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0210]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.

[0211]

[0212] The weight average molecular weight (Mw) of a polyamide-imide resin is measured by gel permeation chromatography (GPC), and is calculated|required by standard polystyrene conversion. Specific measurement conditions are as follows.

[0213] (1) Pretreatment method

[0214] A DMF eluent (10 mM lithium bromide solution) was added to the polyamideimide resin so that the concentration became 2 mg / mL, heated at 80° C. while stirring for 30 minutes, cooled, and then filtered with a 0.45 μm membrane filter, and the The resulting solution was used as a measurement solution.

[0215] (2) Measurement conditions

[0216] Column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mm I.D.×150mm×3 pieces) (both manufactured by Tosoh Corporation)

[0217] El...

manufacture example 1

[0270] [Manufacturing Example 1: Preparation of polyamideimide resin (1)]

[0271] Under a nitrogen atmosphere, add 52 g (162.38 mmol) of 2,2'-bis(trifluoromethyl)benzidine (TFMB) and N,N-dimethylacetamide to a 1 L detachable flask equipped with a stirring blade (DMAc)734.10g, TFMB was dissolved in DMAc, stirring at room temperature. Next, 28.90 g (65.05 mmol) of 4,4'-(hexafluoroisopropylidene) diphthalic dianhydride (6FDA) was added to the flask, and stirred at room temperature for 3 hours. Then, 28.80 g (97.57 mmol) of 4,4'-oxybis(benzoyl chloride) (OBBC) was added to the flask, and stirred at room temperature for 1 hour.

[0272] Next, 7.49 g (94.65 mmol) of pyridine and 26.56 g (260.20 mmol) of acetic anhydride were added to the flask, stirred at room temperature for 30 minutes, then raised to 70° C. using an oil bath, and stirred for a further 3 hours to obtain a reaction liquid.

[0273]The obtained reaction liquid was cooled to room temperature, and it was poured int...

Embodiment 1

[0274] [Example 1: Formation of polyamide-imide film (1)]

[0275] To the polyamide-imide resin (1) obtained in manufacture example 1, DMAc was added so that the density|concentration might become 15 mass %, and the polyamide-imide varnish (1) was produced. Using an applicator, the obtained polyamideimide varnish (1) was applied to the smooth surface of a polyester substrate (trade name "A4100" manufactured by Toyobo) so that the film thickness of the self-supporting film became 55 μm. Drying was carried out at 50° C. for 30 minutes, followed by drying at 140° C. for 15 minutes. Then, the obtained coating film was peeled from the polyester substrate to obtain a self-supporting film.

[0276] The self-supporting film was fixed to a metal frame, and further dried at 230° C. for 30 minutes in the atmosphere to obtain a polyamide-imide film (1) having a thickness of 50 μm.

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Abstract

The object of the present invention is to provide an optical film comprising a polyamide-imide resin, especially a polyamide-imide resin-containing optical film which can be suitably used as a front plate of a flexible display or the like, and which can improve surface hardness even under relatively low-temperature heating conditions. Optical film of imide resin. The present invention provides an optical film comprising a polyamide-imide resin having a peak of tan δ measured by DMA in a temperature range of 300 to 370° C. and having a YI value of 3 or less.

Description

technical field [0001] The present invention relates to an optical film containing a polyamide-imide resin and a method for producing the optical film. Background technique [0002] Currently, image 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. With the expansion of such applications, image display devices (flexible displays) having flexible properties are being sought. The image display device is composed of a display element such as a liquid crystal display element or an organic EL display element, and constituent members such as a polarizing plate, a phase difference plate, and a front panel. In order to realize a flexible display, all the above-mentioned constituent members need to have flexibility. [0003] Previously, glass was used as the front panel. Glass has high transparency and can exhibit high hardness depen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/14C08G73/14C08J5/18C08L79/08C09D7/40C09D179/08G02B5/22
CPCC08G73/14C08J5/18C08L79/08C09D7/40C09D179/08G02B1/14G02B5/22B29C41/02C08G73/1032C08G73/1039G02B1/04
Inventor 宫本皓史杉山纮子池内淳一
Owner SUMITOMO CHEM CO LTD
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