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Composition, optical film, process for producing optical film, polarization plate and liquid crystal display apparatus

A technology for a liquid crystal display device and a manufacturing method, which is applied to optics, polarizing elements, optical elements, etc., can solve the problems of insufficient optical properties and mechanical properties, high glass transition temperature and high viscosity, and achieves good retardation uniformity and contrast ratio. good effect

Inactive Publication Date: 2009-01-07
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In short, the current situation of cellulose ester films for optics is that there are manufacturing burdens and equipment burdens due to the use of solvents in the manufacturing process, and the optical properties and mechanical properties are not sufficient.
[0008] In terms of methods for removing impurities contained in cellulose esters, the following method has been disclosed: a method of washing powdery cellulose esters with water or a poor solvent (see, for example, Patent Document 6), but the current situation is that the impurities cannot be sufficiently removed. Acetic acid is removed as an impurity, but its concentration is still 200ppm. The optical and mechanical properties of the film using these cellulose esters are not enough. The current problem is that the impurity must be removed.
[0009] In recent years, attempts have been made to melt film-form cellulose esters for silver salt photography (see, for example, Patent Document 7) or polarizer protective films (see, for example, Patent Document 8), but there is a problem that cellulose esters are It is a polymer with very high viscosity when melted, and its glass transition temperature is also high. Therefore, it is still difficult to flow even if the cellulose ester is melted and extruded from the die, even if it is cast on a cooling drum or a cooling belt. , and it will solidify in a short time after extrusion, so the haze, bright spot foreign matter, etc. solution cast film

Method used

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  • Composition, optical film, process for producing optical film, polarization plate and liquid crystal display apparatus
  • Composition, optical film, process for producing optical film, polarization plate and liquid crystal display apparatus
  • Composition, optical film, process for producing optical film, polarization plate and liquid crystal display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0331] Carry out the cleaning of the following cellulose ester in the following manner.

[0332] (Synthesis of Cellulose Ester)

[0333] (Cellulose Ester C-1)

[0334] Cellulose acetate propionate, CAP482-20 manufactured by EAST MAN CHEMICAL was used.

[0335] (Cellulose Ester C-2)

[0336] Cellulose acetate butyrate, CAB171-15 manufactured by EAST MAN CHEMICAL was used.

[0337] (Cellulose Ester C-3)

[0338] Synthesized according to the method of the eighth example B of the patent document 7 (the eighth example B). The acetyl substitution degree of the obtained cellulose acetate propionate was 1.90, the propionyl substitution degree was 0.71, the number average molecular weight was 70000, the weight average molecular weight was 22000, and the molecular weight distribution was 3.1.

[0339] (Measurement of molecular weight of cellulose ester)

[0340] The average molecular weight and molecular weight distribution of the cellulose ester were measured using high performan...

Embodiment 2

[0415] In a manner similar to that of Example 1, the cleaned cellulose ester samples C-2-1 to C-2-42 and cellulose ester particles P-2-1 to P-2-42 were prepared, except that : The type of cellulose ester after washing, the type of solvent, the type of AO agent, and the amount added were changed to those shown in Table 3 and Table 4. Furthermore, in the same manner as in Example 1, using these cellulose ester particles, samples 2-1 to 2-42 of cellulose ester films (all with a film thickness of 80 μm) were produced.

[0416] In Table 3 and Table 4, the following compounds were used.

[0417] Chimassorb 944: manufactured by Ciba Specialty Chemicals

[0418] Cyasorb UV-3529: manufactured by Cytec

[0419] Irgafos P-EPQ: manufactured by Ciba Specialty Chemicals

[0420] Irafos 12: manufactured by Ciba Specialty Chemicals

[0421]

[0422]

[0423] For the total amount of free acids used as catalysts such as carboxylic acid derivatives and sulfuric acid present in the prep...

Embodiment 3

[0432] In the same manner as in Example 1, the cleaned cellulose ester film samples C-3-1 to C-3-35 and cellulose ester particles P-3-1 to P-3-35 were prepared. Yes: Change the type of cellulose ester to be washed, the type of solvent, the type of AO, and the added amount to those shown in Table 6. Furthermore, in the same manner as in Example 1, using these cellulose ester particles, samples 3-1 to 3-35 of cellulose ester films (each having a film thickness of 80 μm) were produced.

[0433]

[0434] In Table 6, the following compounds were used.

[0435] SanolLS-2626: Manufactured by Sankyo Life Tech Co., Ltd.

[0436] Compound 2: 6-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][ 1.3.2] Dioxaphosphapane

[0437] In the table, compounds 3 and 19 are the following compounds.

[0438] [chemical formula 21]

[0439]

[0440] For the total amount of free acids used as catalysts such as carboxylic acid derivatives and sulfuric acid p...

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Abstract

The invention provides a composition for melt casting film formation that excels in not only uniformity of retardation being an optical characteristic, especially uniformity of retardation in the direction of film width, but also contrast; and relevant thereto, an optical film, process for producing the optical film, polarization plate and liquid crystal display apparatus. The composition for melt casting film formation contains a cellulose ester in an amount of 50 mass% or more, and the free acid content of the composition is 50 ppm or less.

Description

technical field [0001] The present invention relates to the composition, optical film, the manufacture method of optical film, polarizer and liquid crystal display device that are used for melt cast film, more specifically, the present invention relates to the composition that is used for melt cast film, optical The film, the method for producing an optical film, the polarizing plate, and the liquid crystal display device have good retardation uniformity as optical characteristics, particularly retardation uniformity in the film width direction, and good contrast. Background technique [0002] Liquid crystal display devices (LCD) can be directly connected to IC circuits at low voltage and low power consumption, and can be particularly thinned. Therefore, they are widely used in word processors, personal computers, televisions, monitors, and portable information terminals. and other display devices. The basic structure of such an LCD is, for example, a structure in which pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/10B29C47/14C08J5/18G02B5/30G02F1/1335B29K1/00B29L7/00B29L11/00B29C48/305
CPCC08L1/14B29K2001/12G02F1/13363Y10T428/105B29K2995/0034B29C47/8845B29C47/0021G02F1/133528C08L1/10G02F2202/40B29C55/08C08J5/18B29L2031/3475B29K2001/00C08L1/12G02B5/30C08J2301/10B29K2105/0038C08B3/22B29C48/08B29C48/91B29C48/914B29C48/9165C09K2323/035G02F1/1335B29C48/30
Inventor 中村和明三浦纪生铃木隆行小西敬吏川边里美竹田昭彦清原一人
Owner KONICA MINOLTA OPTO