Method for producing optical film and optical film

A technology of optical film and manufacturing method, which is applied in the direction of chemical instruments and methods, optics, optical components, etc., can solve the problem of uneven drying that cannot be fully solved, and achieves the suppression of uneven drying, the stabilization of the air interface, and high display quality Effect

Active Publication Date: 2011-08-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Thus, it can be seen that, in the case of forming an optically anisotropic layer by rapidly drying the coating solution after applying an increased coating amount on a moving belt-shaped flexible support by using a slit die, it is not possible to use Patent Document 1 sufficiently. To solve the uneven drying, further improvement is needed

Method used

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  • Method for producing optical film and optical film
  • Method for producing optical film and optical film
  • Method for producing optical film and optical film

Examples

Experimental program
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Effect test

Embodiment 1

[0443] First, streaks, unevenness, and orientation of liquid crystal cells in which a fluorinated aliphatic group-containing polymer was added to a composition for forming an optically anisotropic layer were evaluated. In addition, the evaluation was performed in the same manner when the type or addition amount of the fluorinated aliphatic group-containing polymer was changed.

[0444] [Example 1]

[0445]

[0446] The composition described below was put into a mixing tank, stirred while heating at 30° C., and each component was dissolved to prepare a cellulose acetate solution.

[0447] Cellulose acetate solution composition (mass parts)

inner layer

outer layer

Cellulose acetate triphenyl phosphate (plasticizer) biphenyl diphenyl phosphate (plasticizer) dichloromethane (first solvent) methanol (second solvent) 1-butanol with acetylation rate of 60.9% (Third solvent) Silicon oxide microparticles (AEROSIL R972, the following retardation improving agen...

Embodiment 1-2～1-6

[0509] Except having changed coating conditions as shown in Table 1, it carried out similarly to Example 1-1.

[0510] The results are shown in Table 2.

Embodiment 1-7～1-13

[0520] Next, the coating amount of 6.4mL / m was evaluated 2 , drying speed 1.06g / (m 2 • seconds) is constant, and the effect on the surface state and optical properties of the optical compensation sheet when the added amount of the fluorinated aliphatic group-containing polymer is changed. The results are shown in Table 3.

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Abstract

A method for manufacturing an optical film is provided by coating a coating liquid containing liquid crystal composition on an advancing flexible strip supporting body in the speed of 4.5-12mL / m<2>, drying and solidifying to form an optical anisotropy layer. The coating liquid contains a fluoroaliphatic-group monomer of repetitive unit extracted from the monomer according to following term (i), and simutanouesly satisfying following term (ii). Term (i) refers to a fluoroaliphatic-group polymer containing a first fluoroaliphatic-group monomer with end structure presented by -(CF2CF2)3F and a second fluoroaliphatic-group monomer with end structure presented by (CF2CF2)2F. Term(ii), when the product of multiplying concentration of the fluoroaliphatic-group polymer in the coating liquid C(mass%) with fluorine content (F%) of the fluoroaliphatic-group polymer C X F is 0.05-0.12, the ratio between surface tension of the coating liquid measured via maximum bubble pressure method 10 milliseconds and 1000 milliseconds is 1.0-1.2 surface tension after 10 milliseconds / surface tension after 1000 milliseconds.

Description

technical field [0001] The present invention relates to a method for producing an optical film and an optical film, in particular to an optical film and a method for producing an optical film that can improve the viewing angle and visibility of a liquid crystal display device and can be applied to a large liquid crystal display device. Background technique [0002] Optical compensation sheets are used in various liquid crystal display devices for the purpose of eliminating coloring of images and widening the viewing angle. In recent years, a material having an optically anisotropic layer composed of a discotic liquid crystalline compound on a transparent support has been proposed as an optical compensation sheet. In general, discotic liquid crystalline compounds have a large birefringence and various orientation forms. Thus, an optical compensation sheet using a discotic liquid crystalline compound can realize optical properties that cannot be obtained by a conventional str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335C08L101/04C09K19/04
CPCG02B5/3016C09K2019/0429C09K19/542C09K2323/06C08J5/18G02B5/30G02F1/13363
Inventor 下田一弘山本刚司
Owner FUJIFILM CORP
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