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Method for manufacturing optical film and optical film, polarizing plate and display

A technology for an optical film and a manufacturing method, which is applied in the fields of optical films, polarizers and display devices, can solve the problems of rib-like failure of the anti-reflection layer of the active ray-cured resin layer, and white turbidity of the film, and achieves less whitening spots and less color spots. Effect

Inactive Publication Date: 2006-04-19
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the study of the present inventors, although the above-mentioned load required for production is surely reduced by melt casting, the film is partially clouded, and so-called whitening spots, hardness spots of the active ray-cured resin layer, and anti-reflection layer are easily produced. There are still problems in obtaining an optically and physically excellent optical film without color spots.

Method used

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  • Method for manufacturing optical film and optical film, polarizing plate and display
  • Method for manufacturing optical film and optical film, polarizing plate and display
  • Method for manufacturing optical film and optical film, polarizing plate and display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[1408] (Production of Optical Films 1-29)

[1409] The above-mentioned cellulose resin was heat-treated at 120° C. in dry air for 1 hour, and left to cool to room temperature in dry air. With respect to 90 parts by mass of dry cellulose resin, plasticizers and additives other than the above-mentioned cellulose resin were added in the composition of Table 1, mixed with a Henschel mixer, and then heated using an extruder to make pellets. Let it cool.

[1410] After the pellets were dried at 120°C, they were heated and melted at the melting temperature shown in Table 1 using an extruder, and immediately extruded from a T-shaped die, passed through a stretching roll at 158°C to obtain a film at a roll temperature Stretch 1.05 times in the longitudinal direction, then use a tenter to stretch 1.2 times in the width direction and then relax. While cooling, remove the ears at both ends of the width direction by cutting, and then cool to room temperature (20°C). Embosses with a heigh...

Embodiment 2

[1430] "Making of Polarizers"

[1431] Using the optical films 1 to 17 and 19 to 29 produced in Example 1, a hard coat layer and an antireflection layer were formed on one surface thereof to produce antireflection films 1 to 17 and 19 to 29 with a hard coat layer. Polarizing plates 1 to 17 and 19 to 29 were fabricated using this.

[1432]

[1433] The following hard coat composition was applied so as to have a dry film thickness of 3.5 μm, and dried at 80° C. for 1 minute. Then use a high-pressure mercury lamp (80W) at 150mJ / cm 2 It is cured under certain conditions to produce a hard coat film with a hard coat layer. The hard coat layer had a refractive index of 1.50.

[1434]

[1435] 108 parts by mass of dipentaerythritol hexaacrylate (contains about 20% or more components of dimers)

[1436] イルガクユア184 (manufactured by Chiba Specialty Chemicals Co., Ltd.) 2 parts by mass

[1437] 180 parts by mass of propylene glycol monomethyl ether

[1438] 120 parts by mass of e...

Embodiment 3

[1517] Except that the optical film 18 produced in Example 1 was used as the polarizer protection film on the back side instead of the Konika Minolta Tac KC8UCR-4 (manufactured by Konika Minolta Opto Co., Ltd.) used in Example 2 as the polarizer protective film on the back side. Outside the film, a polarizing plate and a liquid crystal display device were produced in the same manner. As a result, it was confirmed that Example 2 was reproduced. The polarizing plate and the liquid crystal display device using the optical film and the antireflection film of the present invention also had no problem of reflection color spots, and had excellent visibility.

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Abstract

The object of the present invention is to provide a film produced by a film-forming method with excellent productivity using simple equipment, which has less whitening spots on the film and is less likely to cause hardness spots on the active ray-curable resin layer and streaky defects and color spots on the antireflection layer. Reduced optical film, polarizing plate and display device using the optical film. The optical film is characterized in that it is formed by extruding a heated melt of cellulose resin containing acyl groups with a total substitution degree of 2.5 to 2.9, a plasticizer, and an ultraviolet absorber with a weight average molecular weight of 490 to 50,000, and then cooled.

Description

technical field [0001] The present invention relates to an optical film, a polarizing plate, and a display device, and more specifically, relates to a film that has less whitening spots and is less likely to generate an active ray-curable resin layer in a film produced by a film-forming method with excellent productivity using simple equipment Hardness spots and streaky failure of anti-reflection layer, optical film with reduced color spots, polarizer and display device using the optical film. Background technique [0002] Liquid crystal displays (LCDs) can be directly connected to IC circuits with low voltage and low power consumption, and especially can be thinned, and are widely used as display devices such as word processors, personal computers, televisions, monitors, and portable information terminals. The basic configuration of this LCD is, for example, to provide polarizing plates on both sides of a liquid crystal cell. [0003] The above-mentione...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/08C08J5/18G02B1/04B29C48/00B29C48/08
CPCC08J5/18H01J2211/442C08J2301/10B32B27/00B29K2001/00C08K5/3475B29K2001/12B29C47/0021B29C47/00B29C48/00B29C48/08Y10T428/31971C08L1/10G02B5/30
Inventor 村上隆道端勇
Owner KONICA MINOLTA OPTO
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