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Polarizer and liquid-crystal display device

A technology for polarizers and polarizers, applied in polarizing components, instruments, optical components, etc., can solve the problems of reduced polarization of polarizers and insufficient adhesion of polarizers, so as to alleviate the reduction of polarization and improve density. Synergistic effect

Active Publication Date: 2014-08-06
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the inventors of the present invention bonded an optical compensation film made of cellulose acylate with a small degree of acyl substitution to a polarizer using a photocurable adhesive, they found that the adhesion to the polarizer was insufficient and the polarization The problem that the degree of polarization of the plate is greatly reduced
It is presumed that the reason is that the optical compensation film has a slight deviation in the orientation angle due to the heat generation and curing shrinkage during the curing of the photocurable adhesive, and the axis deviation occurs.

Method used

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preparation example Construction

[0226] The solvents used in the preparation of dope may be used alone or in combination of two or more. However, from the viewpoint of production efficiency, it is preferable to use a mixture of a good solvent and a poor solvent for cellulose acylate. From the point of view, it is preferable that there are many good solvents.

[0227] The preferable range of the mixing ratio of a good solvent and a poor solvent is 70-98 mass % of a good solvent, and 2-30 mass % of a poor solvent. Good solvents and poor solvents are defined as good solvents that can dissolve the cellulose acylate used alone, and defined as poor solvents that swell or insoluble the cellulose acylate used when used alone. Therefore, good solvents and poor solvents vary depending on the degree of substitution of acyl groups of cellulose acylate.

[0228] The good solvent used in the present invention is not particularly limited, and examples thereof include organic halides such as methylene chloride, dioxolanes, ...

Embodiment 1

[0463]

[0464] (Preparation of Microparticle Dispersion 1)

[0465] Particles (AEROSIL R972V Japan AEROSIL Co., Ltd.) 11 parts by mass

[0466] 89 parts by mass of ethanol

[0467] The above-mentioned substances were stirred and mixed for 50 minutes with a high-speed disperser, and then dispersed with a Manton Golin to prepare a fine particle dispersion 1.

[0468] (Preparation of microparticle additive solution 1)

[0469] The microparticle dispersion 1 was slowly added to a dissolution tank filled with dichloromethane while stirring well. The mass of dichloromethane and fine particle dispersion 1 is as follows. Furthermore, dispersion is performed with an attritor so that the particle size of the secondary particles becomes a predetermined size. This was filtered using Finemet NF manufactured by Nippon Seisen Co., Ltd. to prepare fine particle addition solution 1.

[0470] Dichloromethane 99 parts by mass

[0471] Particle dispersion 15 parts by mass

[0472] (Prep...

Embodiment 2

[0510]

[0511] (production of polarizer)

[0512] A polyvinyl alcohol film having a thickness of 70 μm was swelled in water at 35°C. The obtained film was immersed in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water for 60 seconds, and then immersed in a 45° C. aqueous solution of 3 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. The obtained film was uniaxially stretched under conditions of a stretching temperature of 55° C. and a stretching ratio of 5 times. After washing this uniaxially stretched film with water, it dried and obtained the polarizer with thickness 20 micrometers.

[0513] (preparation of adhesive)

[0514] After mixing the following components, defoaming was performed to prepare a photocurable adhesive liquid. In addition, triarylsulfonium hexafluorophosphate was mixed as a 50% propylene carbonate solution, and the solid content of triarylsulfonium hexafluorophosphate is shown below.

[0...

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Abstract

Provided is a polarizer which is configured of a cellulose acylate film and a polarizing element and in which improved adhesion between the film and the polarizing element has been attained with a photocurable adhesive to inhibit the degree of polarization from decreasing. Also provided is a liquid-crystal display device equipped with the polarizer. The polarizer is a polarizer obtained by laminating a cellulose acylate film that comprises a cellulose acylate having a degree of substitution with an acyl group in the range of 2.0-2.5 and a glass transition temperature lowering agent to one surface of a polarizing element using a photocurable adhesive, and is characterized in that when the amount of the glass transition temperature lowering agent present in the laminating-side surface of the cellulose acylate film and the amount of the agent present in the other surface of the film, the amounts being determined using time-of-flight secondary-ion mass spectroscopy (TOF-SIMS), are expressed by dA and dB, respectively, then the value of r represented by equation (1) is 1.1 or larger. Equation (1) r = dA / dB

Description

technical field [0001] The present invention relates to a polarizing plate and a liquid crystal display device using cellulose acylate. Background technique [0002] Among cellulose esters, it is known that cellulose acylate can be suitably used in optical films having a wide range of retardation by changing the degree of substitution of acyl groups. In general, triacetyl cellulose (TAC), which has a high degree of substitution with acetyl groups, has a low retardation, so it can be well used as a protective film for polarizers. On the other hand, when triacetyl cellulose is used as an optical compensation film for various liquid crystal modes such as VA type and TN type, the expression of retardation is insufficient, so it is necessary to add a retardation enhancer (for example, refer to Patent Document 1). [0003] On the other hand, diacetyl cellulose (DAC), which has a small degree of acetyl substitution, exhibits high retardation performance, and thus can be expected t...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08K5/103C08L1/10G02F1/1335
CPCC08L1/12G02B1/04C08L1/14G02B5/305C08K5/103C08L67/00C08L1/10
Inventor 佐藤英幸
Owner KONICA MINOLTA INC
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