Optically functional film, phase difference film, composition for formation of optically functional layer, and method for manufacture of optically functional film

[0380] (Example 1)

[0381] 20% by mass of the compound (I) represented by the following formula as a rod-shaped compound was dissolved in cyclohexanone and coated with a rod on a substrate composed of a TAC film (manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL) The coating was applied so that the coating amount after drying was 2.5 g / m2. Then, it was heated at 90°C for 4 minutes to dry and remove the solvent, and the rod-shaped compound was immersed in the TAC film, and the coated surface was irradiated with ultraviolet rays to immobilize the rod-shaped compound to produce a retardation film. The obtained retardation film was used as a sample, and the following items were evaluated.

[0382] [化3]

[0383]

[0384] 1. Random uniform orientation

[0385] Using KOBRA-WR manufactured by Oji Measuring Instruments Co., Ltd., Rth and Re were measured for the produced retardation film and the above-mentioned TD80UF by the parallel Nicol rotation method. Regarding Rth and R

[0398] (Example 2)

[0399] 20% by mass of the photopolymerizable liquid crystal compound (I) represented by the above formula (I) as a rod-shaped compound was dissolved in cyclohexanone and coated on an unstretched COP (cycloolefin polymer) film by bar coating (Manufactured by JSR Co., Ltd., trade name: ARTON). Then, it heated at 50 degreeC for 2 minutes, and the solvent was removed. Furthermore, the coating surface was irradiated with ultraviolet rays to immobilize the rod-like compound, and then heated at 90°C for 2 minutes to remove the residual solvent, thereby producing a retardation film. The obtained retardation film was used as a sample, and the following items were evaluated.

[0400] 1. Random uniform orientation

[0401] For the retardation layer of the produced retardation film, Re and the presence or absence of selective reflection wavelength, Rth, and haze were evaluated. The measurement was performed on the entire retardation film and the unstretched COP (cycloolefin

[0413] (Example 3)

[0414] 20% by mass of the photopolymerizable liquid crystal compound (I) represented by the above formula (I), which is a rod-shaped compound, was dissolved in cyclohexanone, and then coated on a uniaxially stretched COP (cycloolefin polymer) by bar coating Film (manufactured by JSR Co., Ltd., trade name: ARTON). Then, it heated at 50 degreeC for 2 minutes, and the solvent was removed. Furthermore, the coating surface was irradiated with ultraviolet rays to immobilize the rod-like compound, and then heated at 90°C for 2 minutes to remove the residual solvent, thereby producing a retardation film. The obtained retardation film was used as a sample, and the following items were evaluated.

[0415] 1. Random uniform orientation

[0416] For the retardation layer of the produced retardation film, the presence or absence of the selective reflection wavelength, Rth, and haze were evaluated. The measurement was performed on the entire retardation film and the above-ment