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Optical film and method for fabrication of same, and polarizing plate, liquid-crystal display device, and polarizing projector screen provided with optical film

An optical film, optical technology, applied in the direction of optics, optical components, optical components, etc., can solve the problem of low utilization efficiency and achieve the effect of easy production

Inactive Publication Date: 2015-11-18
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Of the light from the backlight incident on the absorbing polarizer, one of the polarized components is completely absorbed by the absorbing polarizer, so the utilization efficiency of the light from the backlight becomes less than 50%.

Method used

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  • Optical film and method for fabrication of same, and polarizing plate, liquid-crystal display device, and polarizing projector screen provided with optical film
  • Optical film and method for fabrication of same, and polarizing plate, liquid-crystal display device, and polarizing projector screen provided with optical film
  • Optical film and method for fabrication of same, and polarizing plate, liquid-crystal display device, and polarizing projector screen provided with optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] (1) Synthesis of the first resin forming an optically isotropic continuous phase

[0119] A total of 300 parts by mass of deionized water and 0.6 parts by mass of polyvinyl alcohol (Kuraray Poval manufactured by Kuraray Co., Ltd.) as a dispersant were added to a reactor equipped with a stirring device, a temperature sensor, a cooling pipe, and a nitrogen gas introduction pipe, and stirring was started. Next, 85 parts by mass of methyl methacrylate (MMA), 15 parts by mass of N-cyclohexylmaleimide (CHMI), 1 part by mass of PEROYLTCP from NOF Corporation as a polymerization initiator, and 0.22 parts by mass of 1-octyl mercaptan, nitrogen was blown in and the temperature was raised to 70°C. After holding the state which reached 70 degreeC for 3 hours, it cooled, filtered, wash|cleaned, and dried, and obtained the particulate-form acrylic-type polymer.

[0120] The weight average molecular weight of the obtained acrylic polymer is 1.5×10 5 , the glass transition temperatur...

Embodiment 2

[0137] Except having changed the stretching temperature of the original film of said (5) into 144 degreeC, the optical film was produced by the method similar to Example 1. In addition, when the stretching temperature was changed to 144°C and the evaluation of (2) above was performed, the Re was 6.9 nm and the birefringence was 1.5×10 -4 .

[0138] In addition, in the obtained optical film, the average Feret diameter L of the dispersed phase 1 1.5 μm, average Feret diameter L 2 0.15μm, its ratio: L 1 / L 2 for 10. In addition, the luminance improvement rate measured in the same manner as the above (6) was 9.8%.

[0139] In addition, the obtained optical film was evaluated in the same manner as the image visibility evaluation when used as the polarized light projector screen of Example 1. polarized projector screen.

Embodiment 3

[0141] In the synthesis method of the first resin forming an optically isotropic continuous phase, the composition of the resin is 81 parts by mass of methyl methacrylate (MMA) and 11 parts by mass of N-cyclohexylmaleimide (CHMI). , N-phenylmaleimide (PhMI) 8 mass parts, the optical film was obtained by the method similar to Example 1. The weight average molecular weight of the obtained acrylic polymer is 1.5×10 5 , Tg is 130°C. In addition, the refractive index N of the non-oriented state 1 is 1.502. The obtained original film was uniaxially stretched at the free end in the same direction as the flow direction of the original film using a batch stretcher manufactured by Imoto Seisakusho (extension temperature: Tg of the continuous phase + 9°C (139°C), stretching The in-plane retardation Re in the case of magnification: 1.4 times) was 4.8 nm. That is, the birefringence is a very small 8.0×10 -5 . The reason is that the composition ratio of the copolymer is adjusted so th...

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Abstract

[Problem] To provide an optical film and a method for fabrication thereof, whereby it is possible to allow one orthogonal polarized light component to pass and to disperse another polarized light component. [Solution] Provided is an optical film, including an optically isotropic continuous phase and an optically anisotropic dispersion phase. The birefringence of the optically isotropic continuous phase is less than 1.5*10-4, and a ratio L1 / L2, where L1 is an average Feret diameter of the optically anisotropic dispersion phase in one direction D1 of the planar direction of the optical film and L2 is an average Feret diameter of the optically anisotropic dispersion phase in a direction D2 which is orthogonal to the direction D1, is 2.5 or greater, and the average Feret diameter L2 is 0.5μm or less.

Description

technical field [0001] The present invention relates to an optical film and its manufacturing method. More specifically, it relates to an optical film applicable to a polarizing plate, a liquid crystal display device, and a screen for a polarizing projector, and its manufacturing method. Background technique [0002] Conventionally, an absorption-type polarizing plate is used in a liquid crystal display device. The absorption-type polarizing plate absorbs only one of the orthogonally polarized components of light from a backlight, thereby supplying only a specific polarized component to a liquid crystal cell. [0003] Of the light from the backlight incident on the absorbing polarizer, one of the polarized components is completely absorbed by the absorbing polarizer, so the utilization efficiency of the light from the backlight becomes less than 50%. Therefore, in recent years, studies have been made to improve light use efficiency by arranging a luminance improving film on ...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B5/02G02F1/1335B29C48/08
CPCG02B5/3083B29C55/00B29C55/04G02F1/133536B29C48/08B29D11/00788G03B21/604G02B1/08G02B5/0242G02B5/3016G02F1/13363
Inventor 须崎吾郎西村涼松尾彰
Owner JX NIPPON OIL & ENERGY CORP
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