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Polarizing plate and production method thereof

A technology of polarizers and polarizers, applied in the field of polarizers and their preparation, can solve the problems of small birefringence and lossy polarizers, and achieve the effect of small birefringence and simple preparation

Inactive Publication Date: 2010-08-11
DAICEL ALLNEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only the birefringence is small, and the birefringence changes at the place where the shrinkage stress of the above-mentioned polarizer is large, and the function as a polarizing plate is impaired.

Method used

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  • Polarizing plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In addition, the measurement of the photoelastic coefficient and retardation of a cured film (cured thin film), and the measurement of a glass transition temperature were performed by the following method.

[0077] [Measurement of Photoelastic Coefficient and Phase Difference]

[0078] A cured film having a thickness of 100 μm was prepared, and measured using a three-dimensional birefringence meter ("KOBRA-WR") manufactured by Oji Scientific Instruments, Ltd..

[0079] [Measurement of glass transition temperature]

[0080] The active energy ray-curable resin composition (thickness: 40 μm) was coated on a cold-rolled steel sheet (thickness 0.3 mm x width 20 mm x length 50 mm), and a small UV irradiation machine (manufactured by Eye Graphics Co., Ltd., "ECS-401GX", A rated voltage of 200V, a high pressure mercury lamp) was ir...

Synthetic example 1

[0082] 80.4 parts by weight of ethyl cellulose having a hydroxyl value of 32.9 mgKOH / g was dissolved in 723.6 parts by weight of butyl acetate, and the ethyl cellulose was dehydrated while distilling off butyl acetate at 128°C. After distilling off a mixed solution of 124.8 parts by weight of butyl acetate and water, the water content in the ethyl cellulose butyl acetate solution was measured with a Karl Fischer moisture meter, and the water content was 0.025% by weight. And after dehydration, the butyl acetate of the distilled part was added to the butyl acetate solution of ethyl cellulose, and it adjusted so that the concentration of ethyl cellulose might become 10 weight%.

[0083] Under the atmosphere of 5% oxygen concentration mixed with oxygen and nitrogen, 38.06 parts by weight of butyl acetate, 100 parts by weight of isophorone diisocyanate (IPDI), 0.046 parts by weight of dibutyltin dilaurate [relative to IPDI and A reactant of 2-hydroxyethyl acrylate (HEA), the conce...

Synthetic example 2

[0086] Cellulose acetate (manufactured by Daicel Chemical Industries, Ltd., L-20) was dried at 150° C. for 24 hours so that the water content in the cellulose acetate was 0.86% by weight. The hydroxyl value at this time was 97.13 mgKOH / g. Mix 35 parts by weight of the dried cellulose acetate with 316 parts by weight of cyclohexanone and 65 parts by weight of toluene, and distill off the mixed solution of cyclohexanone, toluene and water at 155° C. When the water content in the cyclohexanone solution of cellulose acetate was measured, the water content was 0.015% by weight. And after dehydration, it adjusted with cyclohexanone so that the density|concentration of the cellulose acetate might become 10.9 weight%.

[0087] In an atmosphere of 5% oxygen concentration mixed with oxygen and nitrogen, 211 parts by weight of a cyclohexanone solution (10.9% by weight solution) of cellulose acetate having a hydroxyl value of 97.13 mgKOH / g, which has been dehydrated in advance, was charg...

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Abstract

This invention provides a polarizing plate and a production method thereof. The polarizing plate is difficult to have double refraction even bearing stress, as the protective film of the polarizing plate is transparent. The polarizing plate of the invention comprises a structure that the proactive film with resin protects at least one single side of the polarizer. The polarizing plate is characterized in that the resin is the cured resin composition with active energy ray curability, and the resin composition with active energy ray curability comprises cellulose derivative that one part of the hydroxyl of the glucose framework is substituted by the group with unsaturated carboxyl acyl. As the group with unsaturated carboxyl acyl, the group can be presented by the following formula (1). In the formula, R1 shows the alkyl that the number of the hydrogen atoms or carbon atoms is 1-4; A1 and A2 are same or different and present the bivalent organic group; X1 and X2 are same or different and present the oxygen atom, the sulfur atom, or -NR2-; R2 presents the alkyl group that number of the hydrogen atoms or carbon atoms thereof is 1-6; n presents 0 or 1.

Description

technical field [0001] The present invention relates to a polarizing plate used in liquid crystal display devices and the like, and a method for producing the same. Background technique [0002] The polarizing plate can be used as a supply element of polarized light in a liquid crystal display device, and can also be used as a detection element of polarized light. In the past, as a polarizing plate, at least one side of a polarizer containing a stretched polyvinyl alcohol (PVA) film containing iodine and the like, bonded with triacetyl cellulose (TAC) Sheets made of protective films, etc. At this time, if the protective film itself has birefringence, the function as a polarizing plate will be greatly reduced. Therefore, in order to prevent this, a TAC film having no optical anisotropy produced by a solvent casting method is used. [0003] In such a conventional polarizing plate, since the PVA film is stretched at a high rate, a large stress is generated in the direction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
Inventor 清水邦雄中本政信
Owner DAICEL ALLNEX