Polyamide-based resin, optical film, and flexible display device
A technology of polyamide and optical film, applied in the field of optical film, to achieve the effect of high elastic modulus and low humidity expansion coefficient
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[0335] 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-based solvents such as N,N-dimethylacetamide and N,N-dimethylformamide; lactone-based solvents such as γ-butyrolactone and γ-valerolactone; 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 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.
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Embodiment
[0395] 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.
[0396]
[0397] The modulus of elasticity of the polyamide 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.
[0398]
[0399] According to JIS K 7105:1981, using the fully automatic direct-reading haze computer HGM-2DP manufactured by Suga Test Instruments Co., Ltd., the total light transmittance Tt of the sample was measured for the optical films obtained in Examples and Comparative Examples .
[0400]
[0401] The measurement...
Embodiment 2
[0431] [Preparation of polyamide-based resin (2)]
[0432] 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 2.36% by mass, and TFMB was dissolved in DMAc while stirring at room temperature. Next, 6FDA was added to the flask so as to be 30.30 mol% relative to TFMB, and stirred at room temperature for 3 hours. Thereafter, after cooling to 10°C, 5.5 mol% of OBBC relative to TFMB and 27.28 mol% of 2,2'-bis(trifluoromethyl)-4,4'- After stirring biphenyl dicarboxylic acid chloride (6FBPDOC) for 10 minutes, 5.05 mol% of OBBC relative to TFMB and 27.28 mol% of 6FBPDOC relative to TFMB were added, and 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 6.06 mol% relative to TFMB, and stirred for 2 hours. Next, 70.71 mol% of diisopropylethylamine and 4-picoline, and 212.12 mol% o...
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