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Adhesive optical film, manufacturing method for the same and image display device using the same

a technology of adhesive optical film and manufacturing method, which is applied in the direction of film/foil adhesives, polarizing elements, instruments, etc., can solve the problems of inability to form a pressure-sensitive adhesive layer, inability to reduce the thickness of the polarizing plate or the pressure-sensitive adhesive layer, and inability to achieve pressure-sensitive adhesive layer formation, etc., to achieve low thickness and reduce unevenness. , the effect of low level of irregularities

Inactive Publication Date: 2013-08-22
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent relates to a pressure-sensitive adhesive optical film that reduces unevenness and visual irregularities caused by variations in the thickness of its pressure-sensitive adhesive layer and its optical film. This is achieved by controlling the standard deviation of the pressure-sensitive adhesive layer to have a high level of smoothness and low level of irregularities. The film can be used in a pressure-sensitive adhesive polarizing plate, which can prevent visible unevenness and impart a clear high-grade appearance to an image display such as a liquid crystal display or an organic EL display. Additionally, the film can be bonded to a front face plate to achieve a clear high-grade appearance while providing no visual irregularities-induced unevenness that could compromise image quality.

Problems solved by technology

Unfortunately, Patent Document 1 does not disclose any specific process for forming a pressure-sensitive adhesive layer, although it discloses that a solvent casting method can be used to form a pressure-sensitive adhesive layer with a small standard deviation.
The disclosure in Patent Document 1 cannot make it possible to form a pressure-sensitive adhesive layer with a substantially small standard deviation.
Unfortunately, the use of the front face plate undesirably increases cost and weight.
However, when such a transparent protective film having undergone no antiglare treatment or a low-haze-value antiglare treatment is used, irregularities on the polarizing plate or the pressure-sensitive adhesive layer are made visible by reflection, which would otherwise be invisible if a conventional transparent protective film with a high haze value is used.

Method used

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  • Adhesive optical film, manufacturing method for the same and image display device using the same
  • Adhesive optical film, manufacturing method for the same and image display device using the same
  • Adhesive optical film, manufacturing method for the same and image display device using the same

Examples

Experimental program
Comparison scheme
Effect test

reference production example 1

(Process of Preparing Laminate)

[0142]The resin substrate used was an amorphous polyethylene terephthalate film (NOVACLEAR manufactured by Mitsubishi Plastics, Inc.) with a glass transition temperature of 80° C. A laminate film including the resin substrate and a polyvinyl alcohol layer was prepared as follows. First, the resin substrate was provided, which had a thickness of 100 μm. An aqueous solution of polyvinyl alcohol (NH26 manufactured by The Nippon Synthetic Chemical Industry Co., Ltd.) was then applied to the resin substrate. A 12-μm-thickpolyvinyl alcohol layer was formed by drying the applied solution at a temperature of 60° C. As a result, a laminate film was obtained.

(Insolubilization Process)

[0143]The resulting laminate film was immersed in an aqueous boric acid solution at a temperature of 30° C. for 30 seconds. The aqueous boric acid solution contained 4 parts by weight of boric acid and 100 parts by weight of water.

(Dyeing Process)

[0144]The prepared laminate film was...

reference production example 2

[0149]The resin substrate used was a polymethylpentene film (TPX manufactured by Mitsui Chemicals, Inc.) with a glass transition temperature of 30° C. Using a process similar to that of Reference Production Example 1, Reference Production Example 2 was performed in which a laminate film including the resin substrate and a polyvinyl alcohol layer (7 μm in thickness) containing adsorbed iodine was longitudinally and uniaxially stretched to an extent just before breaking point by allowing it to pass through a plurality of sets of rollers different in circumferential speed in an aqueous boric acid solution containing boric acid and potassium iodide at a temperature of 60° C. In this process, the stretch ratio (maximum stretch ratio) was 5.5 times.

[0150]As used herein, the phrases “just before breaking point” and the “maximum stretch ratio” mean a stretch ratio about 0.2 (times) lower than the breaking stretch ratio determined in advance as in the case of Reference Production Example 1. ...

example 1

(Preparation of Polarizing Plate)

[0323]A polarizing plate was prepared by bonding 40-μm-thick triacetylcellulose films (KC4UY manufactured by Konica Minolta Holdings, Inc., 0.3% in haze value) as first and second transparent protective films to both sides of the polarizer (1) with an polyvinyl alcohol-based adhesive.

(Preparation of Pressure-Sensitive Adhesive Coating Liquid)

[0324]The solution of the acrylic pressure-sensitive adhesive (1) prepared in Production Example 1 was diluted with ethyl acetate to a solid concentration of 15%, so that a pressure-sensitive adhesive coating liquid was obtained. The pressure-sensitive adhesive coating liquid had a viscosity of 65 P.

(Preparation of Pressure-Sensitive Adhesive Polarizing Plate)

[0325]The pressure-sensitive adhesive coating liquid prepared as described above was applied to one side of a 38-μm-thick, silicone-treated, polyethylene terephthalate (PET) film (MRF38 manufactured by Mitsubishi Polyester Film) with a fountain die coater so...

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Abstract

A pressure-sensitive adhesive optical film of the invention comprises an optical film and a pressure-sensitive adhesive layer provided on the optical film, wherein the pressure-sensitive adhesive layer has a thickness (μm) standard deviation of 0.12 μm or less. The pressure-sensitive adhesive optical film makes it possible to reduce the problem of visible unevenness caused by a pressure-sensitive adhesive layer.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS[0001]This is a Divisional of application Ser. No. 13 / 820, 606, filed Mar. 4, 2013, which is a 371 of International Application No. PCT / JP2011 / 067337 filed on Jul. 28, 2011, and which claims priority of Japnaese Patent Application Nos. 2010-198126, 2010-268471 and 2011-118362, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The invention relates to a pressure-sensitive adhesive optical film and a producing method thereof. The invention also relates to an image display such as a liquid crystal display, an organic electroluminescence (EL) display, a cathode-ray tube (CRT), or a plasma display panel (PDP) produced using the pressure-sensitive adhesive optical film and to a part used together with an image display, such as a front face plate, produced using the pressure-sensitive adhesive optical film. Examples of the optical film that may be used include a polarizing plate, a retardation plate, an optical com...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B5/30B05D5/10C09J7/02B32B7/02G02F1/1335G02F1/13363
CPCC09J7/0207Y10T428/265G02B5/3025B05D5/10Y10T428/24975G02B5/3033C09J7/385Y10T156/10C09K2323/05B32B7/12G02B5/30H05B33/02
Inventor YASUI, ATSUSHITOYAMA, YUUSUKEISHII, TAKAAKIFUJITA, MASAKUNIKIMURA, TOMOYUKISATAKE, MASAYUKIGOTO, SHUSAKUKITAGAWA, TAKEHARUMIYATAKE, MINORUMORI, TOMOHIROKAMIJO, TAKASHI
Owner NITTO DENKO CORP
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