Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device

一种纤维素酰化物、层合薄膜的技术，应用在纤维素酰化物层合薄膜和生产纤维素酰化物层合薄膜领域，能够解决没有研究薄膜延迟波长色散性能、背景黑色表现不可能、视角狭窄等问题，达到改善波长色散性能、解决色移问题、生产成本低的效果

Inactive Publication Date: 2010-11-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the VA mode liquid crystal display device has the following problem: When displaying a black level, the VA mode liquid crystal display device can display an almost completely black image in the normal direction of the display panel, but when viewing the black level from an oblique direction thereof When using the panel, there is light leakage, which makes the background black performance impossible, so the viewing angle is narrow
In these references, besides the haze of the film, other properties such as its moisture permeability and dimensional stability are studied; however, the retarded wavelength dispersion properties of the film are not studied at all

Method used

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  • Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device
  • Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device
  • Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device

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preparation example Construction

[0082] The most common industrial synthesis method of mixed fatty acid esters of cellulose includes: using fatty acids corresponding to acetyl groups and other acyl groups (such as acetic acid, propionic acid, valeric acid, etc.) or mixed organic acid components containing their anhydrides carry out acylation.

[0083] From the viewpoint of retarded wavelength dispersion properties of the film, in the film of the present invention, the cellulose acylate used for the low substitution layer preferably satisfies the following formulas (3) and (4)

[0084] (3) 1.0

[0085] Wherein, X1 represents the substitution degree of the acetyl group of the cellulose acylate of the low substitution layer,

[0086](4) 1.0≤Y1<1.5

[0087] Here, Y1 represents the sum of the degrees of substitution of the acyl groups having at least 3 carbon atoms in the cellulose acylate of the low-substituted layer.

[0088] For Z1 in formula (1), X1 and Y1 satisfy X1+Y1=Z1.

[0089] From the viewpoi...

Embodiment

[0300] The following examples are given to describe the present invention more specifically. In the following examples, materials, reagents and substances used, their usage amounts and ratios, treatment contents and treatment procedures, etc. can be appropriately changed as long as they do not depart from the gist of the present invention. Therefore, the scope of the present invention should not be limitedly interpreted to the Examples shown below.

[0301] (Preparation of Cellulose Acylate)

[0302] Cellulose acylate was prepared according to the methods described in JP-A 10-45804 and 08-231761, and its degree of substitution was measured. Specifically, sulfuric acid (7.8 parts by mass relative to 100 parts by mass of cellulose) was added as a catalyst, carboxylic acid was added as a raw material of an acyl substituent, and an acylation reaction was performed at 40°C. In this process, the type and degree of substitution of the acyl group are adjusted by adjusting the type a...

Embodiment 34

[0388] Except that the solution C01 was diluted to a viscosity of about 30 Pa·s and the solution C01 was diluted to a viscosity of at least about 60 Pa·s., using the same conditions as in Example 2, casting the above-mentioned Table 1 for Cellulose acylate solution C01 for the low substitution layer and cellulose acylate solution S02 for the high substitution layer. Finally, a film sample was prepared, but it required a huge load to peel it off the tape.

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PUM

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Abstract

A cellulose acylate laminate film, which comprises a low-substitution layer comprising a non-phosphate compound and a cellulose acylate having a total degree of acyl substitution of more than 2.0 and less than 2.7 and a high-substitution layer comprising a cellulose acylate having a total degree of acyl substitution of more than 2.7<Z2, wherein Re at a wavelength of 550 nm is the same as or larger than Re at a wavelength of 440 nm.

Description

technical field [0001] The present invention relates to a cellulose acylate laminated film and a method for producing a cellulose acylate laminated film, as well as to a polarizer and a liquid crystal display device. Background technique [0002] In recent years, television applications of liquid crystal display devices are becoming more and more popular, and as television screens become larger, there is a greater demand for enhanced quality and reduced cost of display devices. In particular, the VA-mode liquid crystal display device is most popular as a liquid crystal display device for television use because it has a high contrast ratio and its production yield is high. [0003] However, the VA mode liquid crystal display device has the following problem: When displaying a black level, the VA mode liquid crystal display device can display an almost completely black image in the normal direction of the display panel, but when viewing the black level from an oblique directio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B23/04B32B27/06C08L1/10C08L67/00B29C41/32B29K1/00G02B5/30G02F1/1335
CPCB32B23/00B29K2995/0034B29K2001/00B29K2001/12B29C55/08B29C41/32C08L1/12C08L1/10C09K2323/031Y10T428/24975Y10T428/3179Y10T428/31986
Inventor 池田显武田淳立川博道渡边晋也
Owner FUJIFILM CORP
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