Polarizing plate protection film, polarizing plate and liquid crystal display device

A technology of protective film and polarizer, which is applied in the direction of polarizing elements, instruments, optics, etc., can solve the problem of uneven display of liquid crystal display devices, and achieve the effect of suppressing the deterioration of polarizers and small dimensional changes

Inactive Publication Date: 2016-03-16
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such panel curvature tends to cause display

Method used

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  • Polarizing plate protection film, polarizing plate and liquid crystal display device
  • Polarizing plate protection film, polarizing plate and liquid crystal display device
  • Polarizing plate protection film, polarizing plate and liquid crystal display device

Examples

Experimental program
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Effect test

preparation example Construction

[0169] The organic solvent useful in the preparation of a dope solution can be used without limitation as long as the above-mentioned components such as (meth)acrylic resin and urethane urea resin are simultaneously dissolved.

[0170] For example, dichloromethane is mentioned as a chlorine type organic solvent. Examples of the non-chlorine-based organic solvent include methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-di2,3,3-hexafluoro-1- Propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro-2-methyl-2-propanol, 1,1,1,3,3, 3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc. Among them, methylene chloride, methyl acetate, ethyl acetate, acetone and the like are preferable.

[0171] In addition to the above-mentioned organic solvent, the dope preferably contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms. By containing alcohol in the dope solution, gelation of the...

Embodiment 1

[0253] A dope was prepared by mixing the following components.

[0254] (composition of glue)

[0255] (Meth)acrylic resin A2: 95 parts by mass

[0256] Additive 1 (アクトフロ-UT1001): 5 parts by mass

[0257] Dichloromethane: 213.9 parts by mass

[0258] Ethanol: 67.6 parts by mass

[0259] The obtained dope was uniformly cast on a stainless steel belt support with a width of 2 m at a temperature of 30° C. using a belt casting apparatus. The solvent in the dope was evaporated on the stainless steel belt support until the residual solvent amount became 70%. Then, the obtained film was peeled off from the stainless steel belt support.

[0260] Next, after further drying the peeled film-like material at 45°C, the obtained film was dried while being conveyed by a plurality of rollers in a drying zone of 110°C and 140°C to obtain a film having a film thickness of 40 μm. .

[0261]Corona treatment was performed on the surface of the obtained film under the condition of 100W. The...

Embodiment 2

[0263] A film 102 having a film thickness of 40 μm was obtained in the same manner as in Example 1, except that the film composition was changed to (meth)acrylic resin A6 / cellulose ester E=90 parts by mass / 10 parts by mass.

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Abstract

The purpose of the present invention is to provide a polarizing plate protection film which exhibits little dimensional change due to water absorption and which even when adhered to a polarizer with a water-based adhesive, can minimize the deterioration of the polarizer. This polarizing plate protection film exhibits: a tensile elasticity of 3GPa or more at 23 DEG C and 55%RH; an initial rate of elongation of 0.03 to 0.1%/min when the film has been humidified at 23+/-1 DEG C and 55%RH for 12 hours or longer, and then immersed in water at 23+/-1 DEGC; and an elongation of 0.4% or less after the immersion in water for 30 minutes.

Description

technical field [0001] The present invention relates to a polarizer protective film, a polarizer and a liquid crystal display device. Background technique [0002] Currently, portable liquid crystal display devices such as smartphones and tablets are widely spread. Thinning is required for these liquid crystal display devices. [0003] A liquid crystal display device generally has a liquid crystal cell and a pair of polarizing plates sandwiching the cell. The polarizing plate may have a polarizer, a retardation film (F2 or F3) arranged on the liquid crystal cell side thereof, and a protective film (F1 or F4) arranged on the opposite side of the liquid crystal cell. [0004] As the protective film (F1 or F4), a triacetate cellulose film (TAC) is used because it is transparent, has low birefringence, and is easily adhered to a polarizer via a water paste. However, since the cellulose triacetate film has a high water vapor transmission rate, when exposed to high humidity, th...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/305G02F1/133528
Inventor 伊藤康敏
Owner KONICA MINOLTA INC
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