Cellulose acylate film, polarizing plate, and liquid crystal display device

A technology of cellulose acylate and acylate film, which can be used in polarizing elements, instruments, optical elements, etc., can solve the problems of not being able to achieve damp-heat durability and humidity dependence improvement at the same time, achieve low humidity dependence, and inhibit exudation. Effect

Inactive Publication Date: 2012-07-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the cellulose acylate film described in the above-mentioned patent documents, improvement in humidity-heat durability (suppression of bleeding) and humidity dependence of optical properties cannot be simultaneously achieved.

Method used

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  • Cellulose acylate film, polarizing plate, and liquid crystal display device
  • Cellulose acylate film, polarizing plate, and liquid crystal display device
  • Cellulose acylate film, polarizing plate, and liquid crystal display device

Examples

Experimental program
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Effect test

preparation example Construction

[0226] [Preparation of Cellulose Acylate Film]

[0227] (film formation process)

[0228] The method for producing the cellulose acylate film in the present invention can widely employ any known method for producing a cellulose acylate film, and the film is preferably produced by a solvent casting method. In the solvent casting method, a film can be produced by casting a solution (dope) of cellulose acylate dissolved in an organic solvent.

[0229] The organic solvent preferably includes solvents selected from the group consisting of ethers with 3-12 carbon atoms, ketones with 3-12 carbon atoms, esters with 3-12 carbon atoms and 1-6 carbon atoms. Halogenated hydrocarbons. The ethers, ketones and esters may have a cyclic structure. Compounds having two or more of ether, ketone and ester (ie -O-, -CO- and COO-) functional groups can also be used as the organic solvent. The organic solvent may have other functional groups such as alcoholic hydroxyl groups. In the case of the...

Embodiment 1-18、 comparative example 1-22

[0342] [Formation of cellulose acylate film]

[0343] Cellulose acetate (A) and cellulose acylate (B) were prepared using the raw materials (pulp or cotton linters) described in Table 1. Cellulose acetate (A), cellulose acylate (B), plasticizer 1 and plasticizer 2 were added to the mixing tank in the amounts shown in Table 1, and then a solvent (containing 86.5 parts by mass of A mixed solvent of dichloromethane and 13.5 parts by mass of methanol), the mixture was stirred to dissolve the components, and then filtered through a filter paper with an average pore diameter of 34 μm and a sintered metal filter with an average pore diameter of 10 μm to prepare a cellulose acylate concentrate liquid. Films were formed by solution casting and then used in Examples 1-18 and Comparative Examples 1-22.

[0344]At the same time, the concentration of cellulose acylate in the dope was controlled to 22% by mass. The dope was filtered through filter paper (manufactured by Toyo Roshi Kaisha...

Embodiment 19-28

[0388] Films were produced in the same manner as in Example 15 except that [Plasticizer 1] was changed from P-1 to P-2 to P-11, respectively, and evaluated. As in Example 15, all the haze and damp heat durability results were A.

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Abstract

A cellulose acylate film, having: a cellulose acylate mixture; and a plasticizer, wherein the cellulose acylate mixture contains: a cellulose acetate having a degree of substitution with acetyl group of 2.7 to 2.95; a cellulose acylate having a total degree of substitution with acyl group of 2.0 to 2.9 and a degree of substation with acyl group having 3 to 6 carbon atoms of 0.05 to 0.40, a mixing ratio of the cellulose acetate to the cellulose acylate is 90 / 10 to 40 / 60 by mass, the cellulose acylate mixture has a total degree of substitution with acyl group of 2.6 to 2.95, a degree of substitution with acetyl group of 2.2 to 2.9, and a degree of substitution with acyl group having 3 to 6 carbon atoms of 0.05 to 0.40, and an amount of the plasicizer is 30% to 60% by mass based on the cellulose acylate mixture.

Description

technical field [0001] The present invention relates to a cellulose acylate film, a polarizing plate and a liquid crystal display device. Background technique [0002] In general, cellulose acylate films have been used for photographic supports and various optical materials because of their excellent toughness and flame retardancy. In particular, cellulose acylate films have recently been commonly used as optically transparent films for liquid crystal display devices. Since cellulose acylate film has high optical transparency and high optical isotropy, cellulose acylate film is excellent as an optical material for devices that deal with polarization (such as liquid crystal display devices), so cellulose acylate films have hitherto been The compound film is used as a protective film of a polarizer or an optical compensation film capable of improving a display viewed from an oblique direction (viewing angle compensation). [0003] From the viewpoint of optical properties and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08L67/00G02B5/30G02F1/1335
CPCC08J5/18C08L1/12C08L1/10G02B1/105C08J2301/10G02B1/14C09K2323/031C09K2323/035C08L1/14
Inventor 蒲原一男浅井健吾
Owner FUJIFILM CORP
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