Optical film, flexible display device, and manufacturing method of optical film
A flexible display device and optical film technology, applied in the field of optical film, can solve the problems of damaged optical homogeneity, image distortion, uneven thickness, etc., and achieve the effect of excellent optical homogeneity and high optical characteristics
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[0322] Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise indicated, "%" and "part" in an example mean mass % and mass part. First, the measurement method of a physical property value is demonstrated.
[0323]
[0324] Gel permeation chromatography (GPC) assay
[0325] (1) Pretreatment method
[0326]The sample was dissolved in γ-butyrolactone (GBL) to prepare a 20% by mass solution, then diluted 100-fold with N,N-dimethylacetamide (DMF) eluent, and subjected to a 0.45 μm membrane filter. The obtained solution was filtered and used as a measurement solution.
[0327] (2) Measurement conditions
[0328] Column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mm I.D.×150mm×3 pieces)
[0329] Eluent: DMF (added with 10 mM lithium bromide)
[0330] Flow: 0.6mL / min
[0331] Detector: RI detector
[0332] Column temperature: 40℃
[0333] Injection volume: 20μL
[0334] Molecular weight standard: standard polystyrene
[0335] ...
manufacture example 1
[0414] Production Example 1: Production of Polyimide Resin 1
[0415] Prepare a reactor including a silicone tube, a stirring device and a thermometer, and an oil bath in a separable flask. 75.52 parts of 6FDA and 54.44 parts of TFMB were put into this flask. While stirring this at 400 rpm, 19.84 parts of DMAc was added, and stirring was continued until the content of the flask became a uniform solution. Next, stirring was continued for further 20 hours while adjusting the temperature in the container to the range of 20 to 30°C using an oil bath, and the reaction was carried out to generate a polyamic acid. After 30 minutes, the stirring speed was changed to 100 rpm. After stirring for 20 hours, the temperature of the reaction system was returned to room temperature, and 649.8 parts of DMAc was added and adjusted so that the polymer concentration was 10% by mass. Further, 32.27 parts of pyridine and 41.65 parts of acetic anhydride were added, and the mixture was stirred at ...
manufacture example 2
[0416] Production Example 2: Production of Polyimide Resin 2
[0417] Except having changed the stirring time at 20-30 degreeC to 30 hours, it carried out similarly to manufacture example 1, and manufactured the polyimide resin 2 which has a weight average molecular weight of 430,000, and an imidation rate of 98.3%.
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