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Optical film, polarizing plate, and liquid crystal display device

A technology of optical film and organic particles, which is applied in the direction of optics, polarizing elements, optical elements, etc., can solve problems such as insufficient improvement of adhesion, difficulty in adhesion resistance, and increased haze of optical films, achieving excellent adhesion resistance, Excellent effect of transparency

Active Publication Date: 2020-11-24
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the fine particles described in these are simply added, the improvement of adhesion between optical films containing cycloolefin resins and (meth)acrylic resins is not sufficient. If the adhesion resistance is to be further improved, the If it contains a large amount of fine particles, the haze of the optical film will increase and the transparency will decrease.
Therefore, it is practically difficult to improve sticking resistance without increasing the haze of a film including an optical film containing a cycloolefin-based resin, a (meth)acrylic resin.

Method used

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  • Optical film, polarizing plate, and liquid crystal display device
  • Optical film, polarizing plate, and liquid crystal display device
  • Optical film, polarizing plate, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0270] "The Production of Optical Film 1"

[0271] [Production of Organic Microparticles 1]

[0272] 200 mass parts of deionized water and 0.6 mass parts of sodium lauryl sulfate (SLS) are charged into a glass reactor equipped with a thermometer, a reflux condenser, a nitrogen inlet pipe, and agitator, and heated to 0.8 parts by mass of ammonium persulfate was added to the obtained aqueous solution at 80 to 85° C. while stirring.

[0273] Into the obtained aqueous solution, 10 parts by mass of styrene (St), 50 parts by mass of methyl methacrylate (MMA), and 20 parts by mass of divinylbenzene (DVB) were further added dropwise over 1 hour, and then, the obtained mixed The solution was stirred for 1 hour to obtain an emulsion. The obtained emulsion was dried by spray drying to obtain organic fine particles 1 .

[0274] [Preparation of Microparticle Dispersion 1]

[0275] After stirring and mixing 3 parts by mass of organic fine particles 1 and 97 parts by mass of methylene ch...

Embodiment 2

[0327] 3. Fabrication of Polarizers

[0328]

[0329] A polyvinyl alcohol film having a thickness of 70 µm was swelled with water at 35°C. The obtained film was immersed for 60 seconds in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water, and further 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. This uniaxially stretched film was washed with water and then dried to obtain a 20 μm thick polarizer.

[0330]

[0331] (Preparation of active energy ray curable adhesive)

[0332] After mixing the following components, defoaming was performed to prepare an active energy ray-curable adhesive. In addition, triarylsulfonium hexafluorophosphate was mixed as 50% propylene carbonate solution, and the solid content amount of triarylsulfonium hexaf...

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Abstract

The present invention addresses the problem of providing an optical film having excellent adhesion resistance and transparency between films. Also provided are a polarizing plate and a liquid crystaldisplay device provided with the optical film. This optical film contains a resin and organic fine particles, and is characterized by satisfying the following requirements (I) and (II). (I) E1 represents the average modulus of elasticity of the resin portion that does not contain the organic fine particles, E2 represents the average modulus of elasticity of the organic fine particle portion, and the ratio (E2 / E1) of E1 to E2 satisfies formula (1): 1.0<E2 / E1<=4.0. (II) The resin contains at least one of a cycloolefin resin and a (meth) acrylic resin.

Description

technical field [0001] The invention relates to an optical film, a polarizer and a liquid crystal display device. More specifically, the present invention relates to an optical film excellent in adhesion resistance between films and transparency, a polarizing plate and a liquid crystal display device including the optical film. Background technique [0002] In recent years, with the development of display devices, demand for flat panel display devices such as liquid crystal display devices and organic EL display devices has increased. Furthermore, in order to improve moisture permeability resistance, cycloolefin-based resins and (meth)acrylic-based resins have come to be used as optical films. [0003] However, on the other hand, an optical film made of such a resin has a problem of being poor in slidability and sticking resistance. Therefore, at the time of manufacture of an optical film, there exists a problem that sticking and damage between films generate|occur|produce...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/14G02F1/1335
CPCG02B5/3033G02B1/14G02F1/133528G02B5/305G02F1/1335
Inventor 岛田光星连理英子
Owner KONICA MINOLTA INC
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