JP2012211305A - Transparent double-sided adhesive sheet for image display device, and image display device - Google Patents

Transparent double-sided adhesive sheet for image display device, and image display device Download PDF

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JP2012211305A
JP2012211305A JP2012023859A JP2012023859A JP2012211305A JP 2012211305 A JP2012211305 A JP 2012211305A JP 2012023859 A JP2012023859 A JP 2012023859A JP 2012023859 A JP2012023859 A JP 2012023859A JP 2012211305 A JP2012211305 A JP 2012211305A
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sensitive adhesive
image display
adhesive sheet
display device
pressure
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JP5952013B2 (en
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Kahoru Niimi
かほる 新美
Makoto Inanaga
誠 稲永
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Mitsubishi Plastics Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels

Abstract

PROBLEM TO BE SOLVED: To provide a new transparent double-sided adhesive sheet for an image display device arranged between a surface protecting panel and a visible side of a liquid-crystal module in an image display device for integrating those panel and module, the sheet transmitting visible light and ensuring sufficient visibility, and having ultraviolet cutting property.SOLUTION: The transparent double-sided adhesive sheet having at least one layer of an ultraviolet ray absorbing layer whose light transmittance at the wavelength of 380 nm is ≤30%, and the visible light transmittance at a longer wavelength side than the wavelength of 430 nm is ≥80% is used.

Description

本発明は、プラズマディスプレイ（ＰＤＰ）、液晶ディスプレイ（ＬＣＤ）、有機ＥＬディスプレイ（ＯＬＥＤ）、電気泳動ディスプレイ（ＥＰＤ）、干渉変調ディスプレイ（ＩＭＯＤ）などの画像表示装置において、表面保護パネルと、偏光板や液晶セルなどを内蔵する液晶モジュールとの間に配設して用いられる、画像表示装置用透明両面粘着シートに関するものである。   The present invention relates to a surface protection panel and a polarizing plate in an image display device such as a plasma display (PDP), a liquid crystal display (LCD), an organic EL display (OLED), an electrophoretic display (EPD), and an interference modulation display (IMOD). The present invention relates to a transparent double-sided pressure-sensitive adhesive sheet for an image display device, which is used by being disposed between a liquid crystal module incorporating a liquid crystal cell and the like.

上記画像表示装置は、種々の部材によって構成され、このような画像表示装置用構成部材を貼り合せて一体化するために、粘着剤又は粘着シートが用いられている。例えば、タッチパネルディスプレイでは、表面保護パネル、タッチパネル、画像表示パネルなどの画像表示装置用構成部材が用いられ、これらの構成部材を積層する際に、粘着剤又は粘着シートが使用されている。   The image display device is composed of various members, and an adhesive or an adhesive sheet is used to bond and integrate such image display device components. For example, in a touch panel display, constituent members for an image display device such as a surface protection panel, a touch panel, and an image display panel are used, and an adhesive or an adhesive sheet is used when these constituent members are laminated.

例えば、特許文献１では、ガラスまたはプラスチック等の透明基材と粘着材の界面に異物が存在して気泡が発生しても、ディスプレイの視認性を低下させない粘着材として、（Ａ）（メタ）アクリル酸誘導体、（Ｂ）（メタ）アクリル酸誘導体ポリマ、及び（Ｃ）重量平均分子量が１，０００以上の多官能（メタ）アクリル酸誘導体を含有する混合物を硬化させてなり、２５℃におけるｔａｎδが０．５以下である粘着材が提案されている。   For example, in Patent Document 1, as a pressure-sensitive adhesive that does not reduce the visibility of a display even if foreign matter is present at the interface between a transparent base material such as glass or plastic and a pressure-sensitive adhesive and bubbles are generated, (A) (Meta) A mixture containing an acrylic acid derivative, (B) (meth) acrylic acid derivative polymer, and (C) a polyfunctional (meth) acrylic acid derivative having a weight average molecular weight of 1,000 or more is cured, and tan δ at 25 ° C. A pressure-sensitive adhesive material having a value of 0.5 or less has been proposed.

特許文献２では、貼合時に発生した気泡が加熱加圧処理により消泡し、さらに耐衝撃性を有するディスプレイ用耐衝撃フィルムとして、２５℃におけるｔａｎδが０．５以上である第１層と２５℃におけるｔａｎδが０．５未満である第２層及び２５℃におけるｔａｎδが０．５以上である第３層からなるディスプレイ用耐衝撃フィルムが提案されている。   In Patent Document 2, the first layer having a tan δ at 25 ° C. of 0.5 or more as a shock-resistant film for a display, in which bubbles generated at the time of bonding are defoamed by heat and pressure treatment and has impact resistance, and 25 An impact-resistant film for displays comprising a second layer having a tan δ at 0.5 ° C. of less than 0.5 and a third layer having a tan δ at 25 ° C. of 0.5 or more has been proposed.

特許文献３では、画像表示装置における表面保護層又はタッチパネルと画像表示ユニットの表示面とを貼付する、又は表面保護層とタッチパネルとを貼付する透明粘着シートとして、（Ａ）アルキル基の炭素数が４〜１８である（メタ）アクリル酸アルキルエステル、（Ｂ）ホモポリマーのガラス転移温度（Ｔｇ）が５０℃以上である極性モノマー、及び（Ｃ）（Ｃ−１）特定の式で示される（メタ）アクリル酸エステル、又は（Ｃ−２ホモポリマーのガラス転移温度（Ｔｇ）が１０℃以下である親水性モノマーを含むモノマーの共重合体を含み、１４０℃、１．０Ｈｚにおけるｔａｎδが０．１３以上であり、且つ２５℃、１．０Ｈｚにおける貯蔵弾性率が８．９×１０４Ｐａ以下である、透明粘着シートが提案されている。 In patent document 3, (A) carbon number of an alkyl group is (A) as a transparent adhesive sheet which affixes the surface protection layer or touchscreen in an image display apparatus, and the display surface of an image display unit, or affixes a surface protection layer and a touchscreen. (Meth) acrylic acid alkyl ester that is 4 to 18, (B) a polar monomer having a glass transition temperature (Tg) of a homopolymer of 50 ° C. or higher, and (C) (C-1) represented by a specific formula ( It includes a copolymer of a monomer containing a meth) acrylic acid ester or a hydrophilic monomer having a glass transition temperature (Tg) of the C-2 homopolymer of 10 ° C. or lower, and tan δ at 140 ° C. and 1.0 Hz is 0.00. There has been proposed a transparent adhesive sheet having a storage elastic modulus of 13 or more and a storage elastic modulus at 25 ° C. and 1.0 Hz of 8.9 × 10 4 Pa or less.

さらに近年では、ディスプレイの軽量化・薄肉化の流れに伴い、液晶画素内にタッチパネル電極を組込むインセル方式のほか、液晶モジュールのガラス基板や保護パネルに直接電極を設けてタッチパネル機能を付与するオンセル方式等、積層により得ていたタッチパネル機能を直接液晶モジュール内に組込み一体化させる構成（「タッチオンレンズ方式」とも称される。）なども新たに提案されている。   In recent years, along with the trend toward lighter and thinner displays, in-cell systems that incorporate touch panel electrodes in liquid crystal pixels, as well as on-cell systems that provide touch panel functions by providing electrodes directly on the glass substrate and protective panel of liquid crystal modules. For example, a configuration (also referred to as “touch-on-lens method”) in which a touch panel function obtained by stacking is directly incorporated into a liquid crystal module and integrated is proposed.

特開２００９−５７５５０号公報JP 2009-57550 A 特開２００９−３００５０６号公報JP 2009-300506 A 特開２０１０−１６３５９１号公報JP 2010-163591 A

上記のような新たな提案のように、表面保護パネルと液晶モジュールとの間の各種構成部材間を粘着剤や粘着シートを介して一体化する構成により、表面保護パネルと液晶セルとの間に介在したタッチパネルガラスが不要となるばかりか、薄肉化及び軽量化を図ることができ、さらには貼合工程の簡素化による生産性の向上を図ることもできる。   As in the new proposal as described above, the various components between the surface protection panel and the liquid crystal module are integrated with each other via an adhesive or an adhesive sheet. In addition to eliminating the need for an intervening touch panel glass, it is possible to reduce the thickness and weight, and to improve productivity by simplifying the bonding process.

しかしながら、上記のインセル、オンセル及びタッチオンレンズ方式の構成においては、１種類の粘着部材をもって表面保護パネルと液晶モジュールを貼着するため、表面保護パネルの貼着に必要な機能および液晶モジュールへの貼着に必要な機能を１枚の粘着シートまたは粘着樹脂をもって達成せねばならず、従来以上の機能付与が求められる。
特に、ディスプレイモジュールメーカーでは、タッチパネル以外にも偏光フィルムや位相差フィルムなど、貼合して得ていた機能性フィルムによる光学機能等も直接液晶モジュール内や他の構成部材に組込み、極力部材点数を減らすことが想定され、これら機能性フィルムなどの機能性層の簡略化やモジュール構成の変化に伴い、粘着シートには、これら機能性層を保護する為の紫外線カット性が求められることが推察される。 However, in the above-described in-cell, on-cell and touch-on-lens configuration, the surface protection panel and the liquid crystal module are attached with one type of adhesive member, so the functions necessary for attaching the surface protection panel and the liquid crystal module The function required for sticking must be achieved with a single adhesive sheet or adhesive resin, and more functional addition is required.
In particular, display module manufacturers have built-in optical functions such as polarizing films and retardation films in addition to touch panels directly into the liquid crystal module and other components, as much as possible. As the functional layer such as these functional films is simplified and the module configuration is changed, it is speculated that the adhesive sheet is required to have UV-cutting properties to protect these functional layers. The

そこで、本発明の課題は、画像表示装置における表面保護パネルと液晶モジュールの視認側との間に配設して、２つの部材を一体化させるために用いられ、紫外線カット性を有し、かつ可視光を十分に透過して視認性を確保できる、新たな画像表示装置用透明両面粘着シートを提供することにある。   Then, the subject of this invention is arrange | positioned between the surface protection panel in an image display apparatus, and the visual recognition side of a liquid crystal module, and is used in order to integrate two members, and has ultraviolet cut property, An object of the present invention is to provide a new transparent double-sided pressure-sensitive adhesive sheet for an image display device that can sufficiently transmit visible light and ensure visibility.

本発明は、画像表示装置における表面保護パネルと液晶モジュールの視認側との間に配設して、２つの部材を一体化させるための両面粘着シートであって、少なくとも１層の紫外線吸収層を有し、波長３８０ｎｍの光線透過率が３０％以下であり、かつ波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であることを特徴とする画像表示装置用透明両面粘着シートを提案する。   The present invention is a double-sided pressure-sensitive adhesive sheet for integrating two members disposed between a surface protection panel in an image display device and a viewing side of a liquid crystal module, and comprising at least one ultraviolet absorbing layer. Proposed transparent double-sided pressure-sensitive adhesive sheet for an image display device, characterized in that the light transmittance at a wavelength of 380 nm is 30% or less and the visible light transmittance at a wavelength longer than 430 nm is 80% or more To do.

本発明の画像表示装置用透明両面粘着シートは、少なくとも１層の紫外線吸収層を有し、特定波長において特定の光線透過率を有するという性質をもつものであるため、画像表示装置内に配設して用いた場合、画像表示装置の視認側から可視光を十分に透過して、視認性を確保することができ、かつ視認側から入射する紫外光から画像表示装置内の機能性フィルム等の機能性層を保護できるという利点を備える。
したがって、本発明の画像表示装置用透明両面粘着シートは、プラズマディスプレイ（ＰＤＰ）、液晶ディスプレイ（ＬＣＤ）、有機ＥＬディスプレイ（ＯＬＥＤ）、電気泳動ディスプレイ（ＥＰＤ）、干渉変調ディスプレイ（ＩＭＯＤ）などの画像表示装置における、表面保護パネルと液晶モジュールとの間に配設して用いることができる。 The transparent double-sided pressure-sensitive adhesive sheet for an image display device of the present invention has at least one ultraviolet absorbing layer and has a property of having a specific light transmittance at a specific wavelength, and therefore is disposed in the image display device. When used as such, the visible light is sufficiently transmitted from the viewing side of the image display device to ensure the visibility, and from the ultraviolet light incident from the viewing side, such as a functional film in the image display device It has the advantage that the functional layer can be protected.
Therefore, the transparent double-sided pressure-sensitive adhesive sheet for image display device of the present invention is an image of plasma display (PDP), liquid crystal display (LCD), organic EL display (OLED), electrophoretic display (EPD), interferometric modulation display (IMOD), etc. The display device can be used by being disposed between a surface protection panel and a liquid crystal module.

本発明の第１の実施形態にかかる粘着シートの一例を示した図である。It is the figure which showed an example of the adhesive sheet concerning the 1st Embodiment of this invention. 本発明の第２の実施形態にかかる粘着シートの一例を示した図である。It is the figure which showed an example of the adhesive sheet concerning the 2nd Embodiment of this invention. 本発明の第３の実施形態にかかる粘着シートの一例を示した図である。It is the figure which showed an example of the adhesive sheet concerning the 3rd Embodiment of this invention. 本発明の第３の実施形態にかかる粘着シートの他例を示した図である。It is the figure which showed the other example of the adhesive sheet concerning the 3rd Embodiment of this invention. 一般的な画像表示装置の構成例を示した図である。It is the figure which showed the structural example of the general image display apparatus.

以下、本発明の実施形態の一例について説明するが、本発明が下記実施形態に制限されるものではない。   Hereinafter, although an example of embodiment of the present invention is explained, the present invention is not limited to the following embodiment.

＜画像表示装置用透明両面粘着シート＞
本発明の画像表示装置用透明両面粘着シート（以下、「本粘着シート」と称する。）は、少なくとも１層の紫外線吸収層を有し、波長３８０ｎｍの光線透過率が３０％以下であり、かつ波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であることを特徴とする。 <Transparent double-sided pressure-sensitive adhesive sheet for image display devices>
The transparent double-sided pressure-sensitive adhesive sheet for image display device of the present invention (hereinafter referred to as “the present pressure-sensitive adhesive sheet”) has at least one ultraviolet absorbing layer, has a light transmittance of 30% or less at a wavelength of 380 nm, and The visible light transmittance on the longer wavelength side than the wavelength of 430 nm is 80% or more.

このように本粘着シートは、波長３８０ｎｍの光線透過率が３０％以下である必要がある。波長３８０ｎｍの光線透過率が３０％以下であれば、入射する紫外光を十分に遮断することができるから、画像表示装置において表面保護パネルと液晶モジュールの視認側との間に本粘着シートを配設すれば、視認側から入射する紫外光から画像表示装置内の機能性フィルム等の機能性層を保護することができる。かかる観点から、本粘着シートにおいて、波長３８０ｎｍの光線透過率は２５％以下であるのがさらに好ましく、中でも２０％以下であるのが特に好ましい。
他方、本粘着シートは、波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上である必要がある。波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であれば、入射する可視光を十分に透過させることができるから、画像表示装置において表面保護パネルと液晶モジュールの視認側との間に本粘着シートを配設すれば、画像表示装置の視認側から可視光を十分に透過して、視認性を確保することができる。かかる観点から、本粘着シートにおいて、波長４３０ｎｍよりも長波長側における可視光透過率は８５％以上であるのがさらに好ましく、中でも９０％以上であるのが特に好ましい。 Thus, this pressure-sensitive adhesive sheet needs to have a light transmittance of 380 nm of 30% or less. If the light transmittance at a wavelength of 380 nm is 30% or less, the incident ultraviolet light can be sufficiently blocked. Therefore, in the image display device, the pressure-sensitive adhesive sheet is arranged between the surface protection panel and the viewing side of the liquid crystal module. If provided, a functional layer such as a functional film in the image display device can be protected from ultraviolet light incident from the viewing side. From this point of view, in this pressure-sensitive adhesive sheet, the light transmittance at a wavelength of 380 nm is more preferably 25% or less, and particularly preferably 20% or less.
On the other hand, this adhesive sheet needs to have a visible light transmittance of 80% or more on the longer wavelength side than the wavelength of 430 nm. If the visible light transmittance on the longer wavelength side than the wavelength of 430 nm is 80% or more, the incident visible light can be sufficiently transmitted. Therefore, in the image display device, between the surface protection panel and the viewing side of the liquid crystal module. If this pressure-sensitive adhesive sheet is disposed on the screen, visible light can be sufficiently transmitted from the viewing side of the image display device to ensure visibility. From this point of view, in this pressure-sensitive adhesive sheet, the visible light transmittance on the longer wavelength side than the wavelength of 430 nm is more preferably 85% or more, and particularly preferably 90% or more.

＜第１の実施形態＞
第１の実施形態にかかる本粘着シートは、紫外線吸収剤を含有する粘着剤組成物から形成された紫外線吸収層１を有する両面粘着シートである。つまり、紫外線吸収型の透明両面粘着シートであり、当該紫外線吸収層１が単独で両面粘着シートとしての機能を果たすものである。
なお、第１の実施形態にかかる本粘着シートは、図１に示すように、紫外線吸収層１のみからなる単層シートでもよいし、また、紫外線吸収層１の片面ないし両面に、さらに粘着剤層を適宜設けた構成とすることもできるし、紫外線吸収層１を複数積層させた構成とすることもできる。 <First Embodiment>
The pressure-sensitive adhesive sheet according to the first embodiment is a double-sided pressure-sensitive adhesive sheet having an ultraviolet absorbing layer 1 formed from a pressure-sensitive adhesive composition containing an ultraviolet absorber. That is, it is a UV-absorbing transparent double-sided pressure-sensitive adhesive sheet, and the UV-absorbing layer 1 alone functions as a double-sided pressure-sensitive adhesive sheet.
As shown in FIG. 1, the pressure-sensitive adhesive sheet according to the first embodiment may be a single-layer sheet composed of only the ultraviolet absorption layer 1, or may be further provided with a pressure-sensitive adhesive on one side or both sides of the ultraviolet absorption layer 1. A configuration in which layers are appropriately provided may be employed, or a configuration in which a plurality of ultraviolet absorbing layers 1 are stacked may be employed.

（紫外線吸収剤）
前記紫外線吸収剤としては、例えばベンゾトリアゾール系紫外線吸収剤、トリアジン系紫外線吸収剤、ベンゾフェノン系紫外線吸収剤、ベンゾエート系紫外線吸収剤等が挙げられる。これらは単独あるいは２種類以上を併用して用いることができる。 (UV absorber)
Examples of the ultraviolet absorber include benzotriazole ultraviolet absorbers, triazine ultraviolet absorbers, benzophenone ultraviolet absorbers, and benzoate ultraviolet absorbers. These can be used alone or in combination of two or more.

前記紫外線吸収剤として、酸化亜鉛や酸化チタンなどの無機系超微粒子を用いることも可能である。これらも単独あるいは２種類以上を併用して用いることもできる。
酸化亜鉛や酸化チタンなどの無機系超微粒子を透明シート内に散在させることにより、透明シートに入射した紫外域光を散乱させることによって紫外線を遮断することもできる。 As the ultraviolet absorber, inorganic ultrafine particles such as zinc oxide and titanium oxide can be used. These can also be used alone or in combination of two or more.
By dispersing inorganic ultrafine particles such as zinc oxide and titanium oxide in the transparent sheet, ultraviolet rays can be blocked by scattering ultraviolet light incident on the transparent sheet.

第１の実施形態にかかる本粘着シートは、少なくとも１層の紫外線吸収層１を有し、波長３８０ｎｍの光線透過率が３０％以下であり、かつ波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であるという分光特性を要する。このような分光特性を有する紫外線吸収層を形成するためには、例えば上記紫外線吸収剤の配合量が下記の範囲となるように調整すればよい。
すなわち、前記紫外線吸収剤を紫外線吸収層１に内添する場合、紫外線吸収剤の含有量は、紫外線吸収層１を形成する樹脂全質量のうち０．１質量％〜２０質量％であるのが好ましい。２０質量％以下であれば、紫外線吸収剤自体の着色による外観不良や添加剤の析出や浮出、隣接層や被着体へのブリードアウトによる粘着特性の低下が生じる虞が少ない。また、０．１質量％以上であれば、所定の外線吸収性を付与することが容易となり、被着体を紫外線から保護する機能に劣るなどの虞がない。
このように、紫外線吸収層１における紫外線吸収剤の含有量を上記範囲にすることで優れた紫外線吸収性能と粘着特性とを両立することができる。 The pressure-sensitive adhesive sheet according to the first embodiment has at least one ultraviolet absorbing layer 1, has a light transmittance of 380 nm at a wavelength of 30% or less, and a visible light transmittance on a longer wavelength side than the wavelength of 430 nm. Requires a spectral characteristic of 80% or more. In order to form an ultraviolet absorption layer having such spectral characteristics, for example, the blending amount of the ultraviolet absorber may be adjusted to be in the following range.
That is, when the ultraviolet absorber is internally added to the ultraviolet absorbing layer 1, the content of the ultraviolet absorber is 0.1% by mass to 20% by mass with respect to the total mass of the resin forming the ultraviolet absorbing layer 1. preferable. If it is 20 mass% or less, there is little possibility that the appearance defect due to the coloring of the ultraviolet absorber itself, precipitation or floating of the additive, and deterioration of the adhesive property due to bleeding out to the adjacent layer or the adherend will occur. Moreover, if it is 0.1 mass% or more, it will become easy to provide predetermined | prescribed external absorption, and there is no possibility that it may be inferior to the function which protects a to-be-adhered body from an ultraviolet-ray.
As described above, by setting the content of the ultraviolet absorber in the ultraviolet absorption layer 1 within the above range, both excellent ultraviolet absorption performance and adhesive properties can be achieved.

このような分光特性を有する紫外線吸収層１を備えることで、本粘着シートは、視認側から入射する紫外線を遮断し、部材保護に寄与するとともに、液晶側からの可視光を十分に透過し視認性を確保することができる。   By providing the ultraviolet absorbing layer 1 having such spectral characteristics, the pressure-sensitive adhesive sheet blocks ultraviolet rays incident from the viewing side, contributes to member protection, and sufficiently transmits visible light from the liquid crystal side. Sex can be secured.

（粘着剤）
第１の実施形態において、前記粘着剤組成物、すなわち紫外線吸収剤を配合する粘着剤組成物としては、例えばゴム系粘着剤、ポリエステル系粘着剤、エポキシ系粘着剤、アクリル系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤、ビニルアルキルエーテル系粘着剤、ポリアクリルアミド系粘着剤、セルロース系粘着剤などを挙げることができる。
これらの中でも、紫外線硬化型や熱硬化型のアクリル系粘着剤が好ましく、特に熱硬化型のアクリル系粘着剤が、紫外線吸収剤の影響を受けることなく、粘着特性を調整することができる点で好ましい。 (Adhesive)
In the first embodiment, the pressure-sensitive adhesive composition, that is, a pressure-sensitive adhesive composition containing an ultraviolet absorber, is, for example, a rubber-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, or a silicone-based pressure-sensitive adhesive. Examples thereof include an adhesive, a urethane-based adhesive, a vinyl alkyl ether-based adhesive, a polyacrylamide-based adhesive, and a cellulose-based adhesive.
Among these, ultraviolet curable and thermosetting acrylic adhesives are preferred, and in particular, thermosetting acrylic adhesives can adjust the adhesive properties without being affected by the ultraviolet absorber. preferable.

該アクリル系粘着剤としては、例えば（メタ）アクリル酸エステル系重合体（共重合体を含む意で、以下「アクリル酸エステル系（共）重合体」と称する。）をベース樹脂として用いた粘着剤組成物（以下、「本粘着剤組成物」と称する。）から形成されたものを挙げることができる。   Examples of the acrylic pressure-sensitive adhesive include a (meth) acrylic acid ester polymer (hereinafter referred to as “acrylic acid ester (co) polymer”, which includes a copolymer), as a base resin. And those formed from an adhesive composition (hereinafter referred to as “the present adhesive composition”).

ベース樹脂としてのアクリル酸エステル系（共）重合体は、これを重合するために用いるアクリルモノマーやメタクリルモノマーの種類、組成比率、さらには重合条件等を適宜選択することによって、ガラス転移温度（Ｔｇ）や分子量等の物性を適宜調整して調製することが可能である。   The acrylic ester-based (co) polymer as the base resin is selected by appropriately selecting the kind of acrylic monomer or methacrylic monomer used for polymerizing the copolymer, the composition ratio, the polymerization conditions, and the like. ) And molecular weight, etc., can be appropriately adjusted for preparation.

アクリル酸エステル（共）重合体を構成するアクリルモノマーとしては、例えば、２−エチルヘキシルアクリレート、ｎ−オクチルアクリート、イソオクチルアクリレート、ｎ−ブチルアクリレート、エチルアクリレート等を主原料として挙げることができる。
これらの他に、凝集力付与や極性付与等の目的に応じて、さまざまな官能基を有する（メタ）アクリルモノマーを上記アクリルモノマーと共重合させてもよい。
当該官能基を有する（メタ）アクリルモノマーとしては、例えばメチルメタクリレート、メチルアクリレート、ヒドロキシエチルアクリレート、アクリル酸、グリシジルアクリレート、Ｎ−置換アクリルアミド、アクリロニトリル、メタクリロニトリル、含フッ素アルキルアクリレート、オルガノシロキシ基含有アクリレートなどを挙げることができる。
このほかにも、上記アクリルモノマーやメタクリルモノマーと共重合可能な酢酸ビニルやアルキルビニルエーテル、ヒドロキシアルキルビニルエーテル等の各種ビニルモノマーも適宜重合に用いることができる。
これらのモノマーを用いた重合処理としては、溶液重合、乳化重合、塊状重合、懸濁重合などの公知の重合方法が採用可能であり、その際に重合方法に応じて熱重合開始剤や光重合開始剤などの重合開始剤を用いることによりアクリル酸エステル共重合体を得ることができる。 Examples of the acrylic monomer constituting the acrylic ester (co) polymer include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and the like as main raw materials.
In addition to these, a (meth) acrylic monomer having various functional groups may be copolymerized with the acrylic monomer according to the purpose of imparting cohesive force or imparting polarity.
Examples of the (meth) acrylic monomer having the functional group include methyl methacrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid, glycidyl acrylate, N-substituted acrylamide, acrylonitrile, methacrylonitrile, fluorine-containing alkyl acrylate, and organosiloxy group. An acrylate etc. can be mentioned.
In addition, various vinyl monomers such as vinyl acetate, alkyl vinyl ether, and hydroxyalkyl vinyl ether that can be copolymerized with the acrylic monomer and methacrylic monomer can be appropriately used for polymerization.
As the polymerization treatment using these monomers, known polymerization methods such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization and the like can be employed. In this case, a thermal polymerization initiator or photopolymerization is used according to the polymerization method. An acrylic ester copolymer can be obtained by using a polymerization initiator such as an initiator.

（架橋方法）
アクリル酸エステル系（共）重合体を架橋する際には、アクリル酸エステル（共）重合体中に導入した水酸基やカルボン酸基等の反応性基と化学結合しうる架橋剤を添加し、加熱や養生により反応させる方法や、架橋剤としての（メタ）アクリロイル基を２個以上有する多官能（メタ）アクリレートおよび光重合開始剤等の反応開始剤を添加し、紫外線照射等によって架橋する方法が挙げられる。 (Crosslinking method)
When cross-linking the acrylic ester (co) polymer, a crosslinking agent capable of chemically bonding with a reactive group such as a hydroxyl group or a carboxylic acid group introduced into the acrylic ester (co) polymer is added and heated. And a method of reacting by curing, a method of adding a reaction initiator such as a polyfunctional (meth) acrylate having two or more (meth) acryloyl groups as a crosslinking agent and a photopolymerization initiator, and crosslinking by ultraviolet irradiation or the like. Can be mentioned.

（熱架橋剤）
熱架橋剤としては、他とエヴァイソシアネート系架橋剤、エポキシ系架橋剤等を挙げることができ、これらを１種又は２種以上用いることができる。 (Thermal crosslinking agent)
Other examples of the thermal crosslinking agent include an EVA isocyanate crosslinking agent, an epoxy crosslinking agent, and the like, and one or more of these can be used.

上記イソシアネート系架橋剤としては、例えばトリレンジイソシアネート、クロルフェニレンジイソシアナート、ヘキサメチレンジイソシアナート、テトラメチレンジイソシアナート、イソホロンジイソシアネート、キシリレンジイソシアネート、ジフェニルメタンジイソシアネート、水素添加されたジフェニルメタンジイソシアネートなどのイソシアネートモノマーおよびこれらイソシアネートモノマーをトリメチロールプロパンなどと付加したイソシアネート化合物や、イソシアヌレート化物、ビュレット型化合物、さらには公知のポリエーテルポリオールやポリエステルポリオール、アクリルポリオール、ポリブタジエンポリオール、ポリイソプレンポリオールなど付加反応させたウレタンプレポリマー型のイソシアネートなどを挙げることができる。
前記で例示したイソシアネート化合物は、加工性や保管安定性を向上させる為にイソシアネート基を適当なブロック剤で保護していてもよい。
ブロック剤としては、例えばフェノール系、オキシム系、カプロラクタム系、メルカプタン系、イミド系、アミド系、イミダゾール系、アルコール系、活性メチレン系や各種アミン化合物が挙げられ、ブロック剤の解離温度や作業性に応じて公知のものを適宜選択することができる。 Examples of the isocyanate-based crosslinking agent include isocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate. Monomers and isocyanate compounds obtained by adding these isocyanate monomers with trimethylolpropane, isocyanurates, burette type compounds, and addition reaction of known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc. Examples include urethane prepolymer type isocyanate It is possible.
In the isocyanate compounds exemplified above, the isocyanate group may be protected with a suitable blocking agent in order to improve processability and storage stability.
Examples of the blocking agent include phenol, oxime, caprolactam, mercaptan, imide, amide, imidazole, alcohol, active methylene, and various amine compounds. According to this, known ones can be appropriately selected.

上記エポキシ系架橋剤としては、例えばエチレングリコールジグリシジルエーテル、ポリエチレングリコールジグリシジルエーテル、グリセリンジグリシジルエーテル、グリセリントリグリシジルエーテル、１，３−ビス（Ｎ，Ｎ−ジグリシジルアミノメチル）シクロヘキサン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラグリジル−ｍ−キシリレンジアミン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラグリジルアミノフェニルメタン、トリグリシジルイソシアヌレート、ｍ−Ｎ，Ｎ−ジグリシジルアミノフェニルグリシジルエーテル、Ｎ，Ｎ−ジグリシジルトルイジン、Ｎ，Ｎ−ジグリシジルアニリンなどを挙げることができる。   Examples of the epoxy cross-linking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, N, N, N ′, N′-tetraglycidylaminophenylmethane, triglycidyl isocyanurate, m-N, N-diglycidylaminophenylglycidyl ether N, N-diglycidyl toluidine, N, N-diglycidyl aniline and the like.

なお、これら架橋剤の含有量は、ベースポリマーの架橋性官能基導入量に対して、０．５〜２等量の範囲であることが好ましい。   In addition, it is preferable that content of these crosslinking agents is the range of 0.5-2 equivalent with respect to the introduction amount of the crosslinkable functional group of a base polymer.

（光開始剤）
紫外線硬化型粘着剤に用いられる光重合開始剤は、光照射によりラジカルを発生させて系中の重合反応の起点となる。（メタ）アクリル酸エステルやビニル基の反応性ラジカル発生機構は大きく２つに分類され、自身の単結合を開裂し分解してラジカルを発生させる分子内開裂型と、系中の水酸基などから水素を励起させラジカルを発生させる水素引抜型とがあり、光開始剤としてはどちらを用いることもできる。 (Photoinitiator)
The photopolymerization initiator used for the ultraviolet curable pressure-sensitive adhesive generates radicals by light irradiation and becomes a starting point for a polymerization reaction in the system. The mechanism of reactive radical generation of (meth) acrylic acid esters and vinyl groups is broadly classified into two types: intramolecular cleavage type that cleaves and decomposes its own single bond to generate radicals, and hydrogen from hydroxyl groups in the system. And a hydrogen abstraction type that generates radicals, and either can be used as a photoinitiator.

（その他）
アクリル酸エステル系（共）重合体を架橋する際には、必要に応じて各種添加剤を適宜添加してもよい。 (Other)
When cross-linking the acrylic ester (co) polymer, various additives may be appropriately added as necessary.

＜第２の実施形態＞
第２の実施形態にかかる本粘着シートは、図２に示すように、透明支持体２のいずれか一側に少なくとも１層の粘着剤層３を備え、透明支持体２の他側に紫外線吸収層１（ここでは紫外線吸収型粘着剤層）を備えた構成である。したがって、第２の実施形態も、少なくとも１層の紫外線吸収層１を有する。 <Second Embodiment>
As shown in FIG. 2, the pressure-sensitive adhesive sheet according to the second embodiment includes at least one pressure-sensitive adhesive layer 3 on one side of the transparent support 2, and absorbs ultraviolet rays on the other side of the transparent support 2. It is the structure provided with the layer 1 (here ultraviolet absorption type adhesive layer). Therefore, the second embodiment also has at least one ultraviolet absorbing layer 1.

第２の実施形態にかかる本粘着シートは、粘着剤層３と紫外線吸収層１とが透明支持体２を介して積層された構成となり、両者が隣接しないため、紫外線吸収層中の紫外線吸収剤が浮出し、隣接する粘着剤層にブリードアウトすることないため、粘着剤層側への添加剤移行による粘着物性低下の虞がないばかりか、粘着剤層側は熱架橋型に限らず紫外線硬化型粘着剤層から形成したり、紫外線吸収機能以外の機能を独立付与できたりするなどの効果を奏することができる。   The pressure-sensitive adhesive sheet according to the second embodiment has a configuration in which the pressure-sensitive adhesive layer 3 and the ultraviolet light absorbing layer 1 are laminated via the transparent support 2, and since they are not adjacent to each other, the ultraviolet light absorber in the ultraviolet light absorbing layer. Will not bleed out and bleed out to the adjacent adhesive layer, so there is no risk of deterioration of the adhesive properties due to the transfer of additives to the adhesive layer side. It is possible to produce effects such as formation from a curable pressure-sensitive adhesive layer and the ability to provide functions other than the ultraviolet absorption function independently.

前記透明支持体２としては、例えばセルロース系樹脂、ポリエステル系樹脂、（メタ）アクリル系樹脂、ポリカーボネート系樹脂、ポリオレフィン系樹脂、ポリスチレン系樹脂、ポリエーテル系樹脂、ポリフェニレン系樹脂等の透明樹脂を１種もしくは２種以上を用いて形成されたものを挙げることができる。
なお、透明支持体２は、無配向または一軸方向に配向した光学特性を有するものであっても、二軸以上に配向した光学特性を有するものであってもよく、被着体の種類にあわせて適宜選択できる。 Examples of the transparent support 2 include transparent resins such as cellulose resins, polyester resins, (meth) acrylic resins, polycarbonate resins, polyolefin resins, polystyrene resins, polyether resins, polyphenylene resins, and the like. The thing formed using the seed | species or 2 or more types can be mentioned.
The transparent support 2 may have non-oriented or uniaxially oriented optical properties, or may have biaxially or more oriented optical properties, depending on the type of adherend. Can be selected as appropriate.

なお、第２の実施形態における、紫外線吸収層１を構成する紫外線吸収剤や、粘着剤層２を構成する粘着剤の好ましい態様は、上述した第１の実施形態の場合と同じである。   In addition, the preferable aspect of the ultraviolet absorber which comprises the ultraviolet absorption layer 1 in 2nd Embodiment, and the adhesive which comprises the adhesive layer 2 is the same as the case of the 1st Embodiment mentioned above.

＜第３の実施形態＞
第３の実施形態にかかる本粘着シートは、図３に示すように、紫外線吸収層を有する透明支持体４の両面に、粘着剤層３を有する構成を備えたものである。したがって、第３の実施形態も、少なくとも１層の紫外線吸収層を有するものである。 <Third Embodiment>
As shown in FIG. 3, the present pressure-sensitive adhesive sheet according to the third embodiment has a structure having a pressure-sensitive adhesive layer 3 on both surfaces of a transparent support 4 having an ultraviolet absorbing layer. Therefore, the third embodiment also has at least one ultraviolet absorbing layer.

第２の実施形態にかかる本粘着シートは、紫外線吸収層を有する透明支持体を備えた構成、つまり紫外線吸収性を有する透明支持体を備えた構成からなるため、この透明支持体を介して積層される２つの粘着剤層をいずれも、紫外線硬化型粘着剤から形成したり、紫外線硬化型と熱硬化型の粘着剤から形成したりして、被着体の特性に合わせながら、粘着剤層に種々の機能を分離して付与できるなどの効果を奏することができる。
例えば表面保護パネルが被着体の一方である場合には、特に段差追従性が求められるため、例えば、一方の粘着剤層を柔軟にすることで、被着体に凹凸がある場合に凹凸への追従性を得ることができたり、押圧に弱く変形し易い被着体の場合には被着面の元形状に馴染んで変形を抑えることができたりする。
また、液晶モジュールなどのように、環境試験下でアウトガスを放出し易い部材や寸法変化の大きい部材が被着体となる場合は、特に耐発泡性が求められるため、例えば、該被着面に接する側の粘着層を高凝集力の設計にすることで、発泡を抑えることができる。
さらにまた、表裏の粘着層に異なる目的に応じて設計した粘着層を用いることで機能を分離して付与できる。 Since this pressure-sensitive adhesive sheet according to the second embodiment has a configuration including a transparent support having an ultraviolet absorbing layer, that is, a configuration including a transparent support having ultraviolet absorbing properties, the adhesive sheet is laminated via the transparent support. The two pressure-sensitive adhesive layers are formed from an ultraviolet curable pressure sensitive adhesive, or are formed from an ultraviolet curable pressure sensitive adhesive and a heat curable pressure sensitive adhesive so as to match the properties of the adherend. In addition, it is possible to achieve an effect that various functions can be separately provided.
For example, when the surface protection panel is one of the adherends, step followability is particularly required. Therefore, for example, by softening one adhesive layer, if the adherend has irregularities, In the case of an adherend that is weak against pressure and easily deformed, the conformability of the adherend surface can be adjusted to suppress deformation.
In addition, when a member that easily releases outgas under an environmental test or a member having a large dimensional change is an adherend, such as a liquid crystal module, the foaming resistance is particularly required. Foaming can be suppressed by designing the adhesive layer on the side in contact with a high cohesive force.
Furthermore, functions can be separated and imparted by using adhesive layers designed for different purposes for the front and back adhesive layers.

透明支持体４は、単層のものであっても、多層のものであってもよい。
透明支持体４が多層構成の場合には、何れかの層に紫外線吸収層が設けられていればよい。 The transparent support 4 may be a single layer or a multilayer.
In the case where the transparent support 4 has a multilayer structure, an ultraviolet absorbing layer may be provided in any one of the layers.

また、粘着剤層３を紫外線硬化型粘着剤から形成した場合には、図４に示すように、透明支持体４と粘着剤層３との接触面に、添加剤の浮出防止ための表面処理層５を設けることが好ましい。
該表面処理層５は、例えば（メタ）アクリル樹脂組成物を透明支持体４に塗布硬化させたり、酸化ケイ素や酸化アルミニウム等の無機酸化物等を透明支持体４に蒸着させたりする他、ドライラミネーションや押出ラミネーション、熱ラミネーションなどの既知の方法を用いて添加剤の移行を抑制するフィルム層を透明支持体４に積層することで形成することができる。 Further, when the pressure-sensitive adhesive layer 3 is formed of an ultraviolet curable pressure-sensitive adhesive, a surface for preventing the additive from coming out on the contact surface between the transparent support 4 and the pressure-sensitive adhesive layer 3 as shown in FIG. It is preferable to provide the treatment layer 5.
The surface treatment layer 5 is formed by, for example, applying and curing a (meth) acrylic resin composition on the transparent support 4, depositing an inorganic oxide such as silicon oxide or aluminum oxide on the transparent support 4, and drying. It can be formed by laminating a film layer for suppressing the migration of the additive on the transparent support 4 using a known method such as lamination, extrusion lamination, thermal lamination or the like.

さらに、第２および第３の実施形態における透明支持体４には、必要に応じてハードコート層や易接着処理層等を片面または両面に設けてもよい。   Further, the transparent support 4 in the second and third embodiments may be provided with a hard coat layer, an easy adhesion treatment layer, or the like on one side or both sides as necessary.

第３の実施形態において、粘着剤層３を構成する粘着剤の好ましい態様は、上述した第１の実施形態の場合と同じである。   In 3rd Embodiment, the preferable aspect of the adhesive which comprises the adhesive layer 3 is the same as the case of 1st Embodiment mentioned above.

また、第３の実施形態において、透明支持体４に形成された紫外線吸収層としては、第２の実施形態において例示した透明支持体材料に、第１の実施形態において例示した紫外線吸収剤を含有させたものや、第１の実施形態において例示した紫外線吸収剤を塗料として、透明支持体に塗布したものを挙げることができる。
なお、紫外線吸収剤を、塗料として透明支持体に塗布する場合においては、紫外線吸収剤塗料の固形分全量に対して、紫外線吸収剤を０．１〜２０質量％の範囲で添加することが好ましい。 In the third embodiment, the ultraviolet absorber layer formed on the transparent support 4 contains the ultraviolet absorber exemplified in the first embodiment in the transparent support material exemplified in the second embodiment. And those obtained by applying the ultraviolet absorber exemplified in the first embodiment as a paint to a transparent support.
In addition, when apply | coating a ultraviolet absorber to a transparent support body as a coating material, it is preferable to add a ultraviolet absorber in the range of 0.1-20 mass% with respect to the solid content whole quantity of a ultraviolet absorber coating material. .

＜製造方法＞
本粘着シートの製造方法としては、例えば、上述の方法で得た本粘着剤組成物を離型ＰＥＴ等の剥離フィルムの離型処理面上に目的に厚さになるように製膜し、必要に応じて加熱や紫外線照射等の処理を施して架橋反応を進行させて得ることができる。透明支持体を介した構成の場合には、前記支持体上に粘着組成物を直接製膜してもよい。透明支持体や紫外線吸収層とは別個に設けた粘着剤層等を積層した多層構成の粘着シートは、両表面の粘着樹脂を剥離フィルムもしくは透明支持体に所定の厚みになるよう塗布した後、積層する方法のほか、積層構成の一部または全部を共押出して得ることができる。 <Manufacturing method>
As a manufacturing method of this pressure-sensitive adhesive sheet, for example, the pressure-sensitive adhesive composition obtained by the above-described method is formed on the release treatment surface of a release film such as release PET so as to have a desired thickness, and is necessary. Depending on the above, it can be obtained by carrying out a treatment such as heating or ultraviolet irradiation to advance the crosslinking reaction. In the case of a configuration through a transparent support, the pressure-sensitive adhesive composition may be directly formed on the support. After applying the adhesive resin on both surfaces to the release film or the transparent support so as to have a predetermined thickness, the adhesive sheet of the multilayer structure in which the adhesive layer and the like provided separately from the transparent support and the ultraviolet absorbing layer are laminated, In addition to the lamination method, a part or all of the laminated structure can be obtained by coextrusion.

＜画像表示装置＞
本発明の画像表示装置（以下、「本画像表示装置」と称する。）は、２つの画像表示装置構成用部材が、本粘着シートを介して一体化した構成を備えるものである。
画像表示装置用構成部材としては、例えば、周縁部に枠状隠蔽印刷部が形成された構成を有する保護パネルなどの画像表示装置用構成部材を挙げることができる。またそのほかにも、タッチパネル機能が一体化したタッチオンレンズ方式の表面保護パネルを使用することができる。
他方、これと貼合する画像表示装置用構成部材としては、例えば、タッチパネル、画像表示パネルなどを挙げることができる。
前記画像表示パネルとしては、液晶層がガラス基板によっては挟持された構成を有する液晶パネルのほか、表面反射による画質の低下を防ぐために、液晶パネルの視認側に偏光フィルムが積層された構成を有するものなどを挙げることができる。また、前記画像表示パネル内に、タッチパネルを組み込んだオンセル型のほか、液晶の画素の中にタッチセンサ機能を組み込んだインセル型の画像表示パネルなどを用いることもできる。 <Image display device>
The image display device of the present invention (hereinafter referred to as “the present image display device”) has a structure in which two image display device constituting members are integrated with each other through the present adhesive sheet.
Examples of the constituent member for an image display device include a constituent member for an image display device such as a protective panel having a configuration in which a frame-like concealed printing portion is formed at the peripheral edge. In addition, a touch-on-lens surface protection panel with an integrated touch panel function can be used.
On the other hand, examples of the constituent member for an image display device to be bonded to this include a touch panel and an image display panel.
The image display panel has a configuration in which a polarizing film is laminated on the viewing side of the liquid crystal panel in order to prevent deterioration in image quality due to surface reflection, in addition to a liquid crystal panel having a configuration in which a liquid crystal layer is sandwiched between glass substrates. The thing etc. can be mentioned. In addition to an on-cell type in which a touch panel is incorporated in the image display panel, an in-cell type image display panel in which a touch sensor function is incorporated in a liquid crystal pixel can be used.

本画像表示装置は、図５に示すように、表面保護パネル６と、液晶モジュール７の視認側との間に、本粘着シート９を配設してなるものである。これまで、タッチパネル体などの構成部材が、表面保護パネル６と液晶モジュール７との間に配設されていたが、部材点数の減少に伴い、タッチパネル体の機能も他の構成部材と一体化されることが想定され、それに伴い液晶モジュールの視認側面には、紫外線に弱い各種の機能層が付与されることが予想される。
本画像表示装置は、紫外線カット機能を有する本粘着シート３が配設されているので、紫外線カット性を担っていた従来の部材省略に寄与するばかりか、前述した機能層を保護することができるという利点を有する。 As shown in FIG. 5, the present image display device is formed by disposing the present adhesive sheet 9 between the surface protection panel 6 and the viewing side of the liquid crystal module 7. Until now, components such as the touch panel body have been disposed between the surface protection panel 6 and the liquid crystal module 7, but the function of the touch panel body is also integrated with other components as the number of members decreases. Accordingly, it is expected that various functional layers vulnerable to ultraviolet rays are provided on the viewing side surface of the liquid crystal module.
In the present image display device, the pressure-sensitive adhesive sheet 3 having an ultraviolet ray cutting function is provided, so that not only the conventional members that have been responsible for ultraviolet ray cutting properties can be omitted, but also the functional layer described above can be protected. Has the advantage.

前記表面保護パネルとしては、ポリカーボネート系樹脂、アクリル系樹脂、脂環式ポリオレフィン系樹脂、スチレン系樹脂、ポリ塩化ビニル系樹脂およびエポキシ系樹脂などからなる合成樹脂板や、ガラス板などを挙げることができる。   Examples of the surface protective panel include a synthetic resin plate made of polycarbonate resin, acrylic resin, alicyclic polyolefin resin, styrene resin, polyvinyl chloride resin, epoxy resin, and the like, and a glass plate. it can.

＜語句の説明など＞
一般的に「シート」とは、ＪＩＳにおける定義上、薄く、その厚さが長さと幅のわりには小さく平らな製品をいい、一般的に「フィルム」とは、長さ及び幅に比べて厚さが極めて小さく、最大厚さが任意に限定されている薄い平らな製品で、通常、ロールの形で供給されるものをいう（日本工業規格ＪＩＳＫ６９００）。しかし、シートとフィルムの境界は定かでなく、本発明において文言上両者を区別する必要がないので、本発明においては、「フィルム」と称する場合でも「シート」を含むものとし、「シート」と称する場合でも「フィルム」を含むものとする。
また、画像表示パネル、保護パネル等のように「パネル」と表現する場合、板体、シートおよびフィルムを包含するものである。 <Explanation of phrases>
“Sheet” generally refers to a product that is thin by definition in JIS and has a thickness that is small and flat for the length and width. In general, “film” is thicker than the length and width. A thin flat product with an extremely small thickness and an arbitrarily limited maximum thickness, usually supplied in the form of a roll (Japanese Industrial Standard JISK6900). However, since the boundary between the sheet and the film is not clear and it is not necessary to distinguish the two in terms of the present invention, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. In some cases, “film” is included.
In addition, the expression “panel” such as an image display panel and a protection panel includes a plate, a sheet, and a film.

本明細書において、「Ｘ〜Ｙ」（Ｘ，Ｙは任意の数字）と記載した場合、特にことわらない限り「Ｘ以上Ｙ以下」の意と共に、「好ましくはＸより大きい」或いは「好ましくはＹより小さい」の意も包含するものである。
また、「Ｘ以上」（Ｘは任意の数字）と記載した場合、特にことわらない限り「好ましくはＸより大きい」の意を包含し、「Ｙ以下」（Ｙは任意の数字）と記載した場合、特にことわらない限り「好ましくはＹより小さい」の意も包含するものである。 In the present specification, when “X to Y” (X and Y are arbitrary numbers) is described, it means “preferably greater than X” or “preferably,” with the meaning of “X to Y” unless otherwise specified. The meaning of “smaller than Y” is also included.
Further, when described as “X or more” (X is an arbitrary number), it means “preferably larger than X” unless otherwise specified, and described as “Y or less” (Y is an arbitrary number). In the case, unless otherwise specified, the meaning of “preferably smaller than Y” is also included.

以下、実施例及び比較例によりさらに詳しく説明するが、本発明はこれらに限定されるものではない。   Hereinafter, although an Example and a comparative example demonstrate in more detail, this invention is not limited to these.

[実施例１]
２−エチルヘキシルアクリレート（Ｔｇ−７０℃）６２質量部と、酢酸ビニル（Ｔｇ３２℃）３６質量部と、アクリル酸（Ｔｇ１０６℃）２質量部とをランダム共重合してなるアクリル酸エステル共重合体（Ｍｗ＝６０万）１００質量部に、紫外線吸収剤として２‐［４，６‐ジフェニル‐１，３，５‐トリアジン‐２‐イル］‐５‐（ヘキシルオキシ）フェノール１質量部と、架橋剤として、イソシアヌレートを用いてイソホロンジイソシアネートを３量体化し、メチルエチルケトンオキシム（ブロック剤）で保護した３官能イソシアネート架橋剤５０質量部とを混合して粘着剤組成物を調製した。
前記粘着剤組成物を８０℃で溶融し、離型処理したポリエチレンテレフタレートフィルム（三菱樹脂株式会社製「ＭＲＦ７５」厚み７５μｍ）の剥離処理した側に、アプリケータを用いて２５０μｍとなるよう賦型した後、１１０℃に加熱してブロック剤を脱保護して架橋反応を進行させて紫外線吸収層を形成した。次に、表面を剥離処理したポリエチレンテレフタレートフィルム（パナック社製；商品名「ＮＰ５０Ｚ０１」、厚み５０μｍ）の剥離処理した側を、前記紫外線吸収層に重ねて被覆し、温度２５℃湿度４０％で１週間養生させて両面粘着シート１を作製した。 [Example 1]
Acrylate ester copolymer obtained by random copolymerization of 62 parts by mass of 2-ethylhexyl acrylate (Tg-70 ° C.), 36 parts by mass of vinyl acetate (Tg 32 ° C.) and 2 parts by mass of acrylic acid (Tg 106 ° C.) ( Mw = 600,000) 100 parts by mass of 2- [4,6-diphenyl-1,3,5-triazin-2-yl] -5- (hexyloxy) phenol as an ultraviolet absorber and a crosslinking agent As described above, isophorone diisocyanate was trimerized using isocyanurate and mixed with 50 parts by mass of a trifunctional isocyanate crosslinking agent protected with methyl ethyl ketone oxime (blocking agent) to prepare a pressure-sensitive adhesive composition.
The pressure-sensitive adhesive composition was melted at 80 ° C. and subjected to release treatment on a release-treated polyethylene terephthalate film (“MRF75” thickness 75 μm manufactured by Mitsubishi Plastics, Inc.) using an applicator to form 250 μm. Then, the ultraviolet ray absorbing layer was formed by heating to 110 ° C. to deprotect the blocking agent and allowing the crosslinking reaction to proceed. Next, the release-treated side of a polyethylene terephthalate film (manufactured by Panac Co., Ltd .; trade name “NP50Z01”, thickness 50 μm) whose surface was peeled was covered with the ultraviolet absorbing layer and covered with 1 at a temperature of 25 ° C. and a humidity of 40%. The double-sided pressure-sensitive adhesive sheet 1 was prepared by curing for a week.

[実施例２]
（紫外線吸収層の作製）
感圧接着剤層用の組成物として、アクリル酸ブチル（Ｔｇ−５６℃）７３質量部と、メタクリル酸メチル（Ｔｇ１０５℃）２５質量部と、アクリル酸（Ｔｇ１０６℃）２質量部とを共重合してなるアクリル酸エステル共重合体１ｋｇ（Ｍｗ＝１１０万）に対して、架橋剤としてポリイソシアネート化合物（旭化成株式会社製；商品名「デュラネート２４Ａ−１００」）を０．１５ｇと、２−（２’−ヒドロキシ−３−ｔブチルフェニル）ベンゾエートの変性体混合物からなる紫外線吸収剤（ＢＡＳＦ社製；商品名「Ｔｉｎｕｖｉｎ２１３」）１０ｇとを加えて感圧接着剤用組成物（ａ１）を調製した。 [Example 2]
(Preparation of UV absorbing layer)
As a composition for the pressure-sensitive adhesive layer, 73 parts by mass of butyl acrylate (Tg-56 ° C.), 25 parts by mass of methyl methacrylate (Tg 105 ° C.) and 2 parts by mass of acrylic acid (Tg 106 ° C.) are copolymerized. 0.15 g of a polyisocyanate compound (manufactured by Asahi Kasei Co., Ltd .; trade name “Duranate 24A-100”) as a cross-linking agent with respect to 1 kg (Mw = 1,100,000) of the acrylate copolymer thus obtained, 2- ( A composition for a pressure-sensitive adhesive (a1) was prepared by adding 10 g of an ultraviolet absorber (manufactured by BASF; trade name “Tinvin 213”) comprising a modified mixture of 2′-hydroxy-3-tbutylphenyl) benzoate. .

酢酸エチルとトルエンの混合物からなる揮発性有機溶剤を用いて、前記感圧接着剤用組成物（ａ１）を、固形分濃度が１５質量％となるように希釈して塗料を調製した。この塗料を、剥離処理したポリエチレンテレフタレートフィルム（三菱樹脂株式会社製；商品名「ＭＲＦ７５」、厚み７５μｍ）の剥離処理した側に、乾燥後の厚みが３０μｍとなるようにシート状に塗工して紫外線吸収層（Ａ１）を成形した。
次に、露出した粘着面を乾燥させ、未処理のポリエチレンテレフタレートフィルム（三菱樹脂株式会社製；商品名「ダイアホイルＴ−１００」、厚み２５μｍ）を積層した。 Using a volatile organic solvent composed of a mixture of ethyl acetate and toluene, the pressure-sensitive adhesive composition (a1) was diluted to a solid content concentration of 15% by mass to prepare a paint. This paint was applied in a sheet form so that the thickness after drying was 30 μm on the side of the peel-treated polyethylene terephthalate film (Mitsubishi Resin Co., Ltd .; trade name “MRF75”, thickness 75 μm). An ultraviolet absorbing layer (A1) was molded.
Next, the exposed adhesive surface was dried, and an untreated polyethylene terephthalate film (manufactured by Mitsubishi Plastics, Inc .; trade name “Diafoil T-100”, thickness 25 μm) was laminated.

（粘着剤層の作製）
２−エチルヘキシルアクリレート（Ｔｇ−７０℃）７５質量部と、酢酸ビニル（Ｔｇ３２℃）２０質量部と、アクリル酸（Ｔｇ１０６℃）５質量部とをランダム共重合してなるアクリル酸エステル共重合体Ａ（Ｍｗ＝５０万）１ｋｇに対し、架橋剤として紫外線硬化樹脂プロポキシ化ペンタエリスリトールトリアクリレート（新中村化学株式会社製；商品名「ＡＴＭ−４ＰＬ」）１０ｇと、光重合開始剤として４−メチルベンゾフェノン７ｇとを加えて混合して粘着剤組成物（ｂ１）を調製した。
剥離処理したポリエチレンテレフタレートフィルム（株式会社パナック社製；商品名「ＮＰ５０Ｚ０１」、厚み７５μｍ）の剥離処理した側に、前記粘着剤組成物（ｂ１）を厚み２００μｍとなるようアプリケータを用いて塗工して粘着剤層（Ｂ１）を作製した。 (Preparation of adhesive layer)
Acrylic ester copolymer A obtained by random copolymerization of 75 parts by mass of 2-ethylhexyl acrylate (Tg-70 ° C.), 20 parts by mass of vinyl acetate (Tg 32 ° C.) and 5 parts by mass of acrylic acid (Tg 106 ° C.). (Mw = 500,000) 1 kg of UV curable resin propoxylated pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd .; trade name “ATM-4PL”) as a crosslinking agent and 4-methylbenzophenone as a photopolymerization initiator 7 g was added and mixed to prepare an adhesive composition (b1).
The adhesive composition (b1) is coated on the release-treated side of a release-treated polyethylene terephthalate film (manufactured by Panac Corporation; trade name “NP50Z01”, thickness 75 μm) using an applicator so as to have a thickness of 200 μm. Thus, an adhesive layer (B1) was produced.

上記粘着剤層（Ｂ１）の表面に、別途作製した上記紫外線吸収層（Ａ１）の、未処理のポリエチレンテレフタレートフィルム面が接するように被覆積層した。積層体の粘着層（Ｂ１）側より高圧水銀ランプにて波長３６５ｎｍの紫外線を積算光量２０００ｍＪ／ｃｍ２となるよう照射して粘着剤層（Ｂ１）を硬化させた。その後、常態（温度２５℃、湿度４０％）にて７日間養生して、紫外線吸収層（Ａ１）の架橋反応を進行させ、両面粘着シート２を作製した。 The surface of the pressure-sensitive adhesive layer (B1) was coated and laminated so that the untreated polyethylene terephthalate film surface of the separately prepared ultraviolet absorbing layer (A1) was in contact therewith. The pressure-sensitive adhesive layer (B1) was cured by irradiating ultraviolet light having a wavelength of 365 nm with a high-pressure mercury lamp from the pressure-sensitive adhesive layer (B1) side of the laminate so as to have an integrated light quantity of 2000 mJ / cm 2 . Thereafter, the film was cured for 7 days in a normal state (temperature: 25 ° C., humidity: 40%), the crosslinking reaction of the ultraviolet absorbing layer (A1) was advanced, and the double-sided pressure-sensitive adhesive sheet 2 was produced.

[実施例３]
上記実施例１で用いたアクリル酸ブチル（Ｔｇ−５６℃）７３質量部と、メタクリル酸メチル（Ｔｇ１０５℃）２５質量部と、アクリル酸（Ｔｇ１０６℃）２質量部とを共重合してなるアクリル酸エステル共重合体１ｋｇ（Ｍｗ＝１１０万）に、架橋剤としてポリイソシアネート化合物（旭化成株式会社製；商品名「デュラネート２４Ａ−１００」）０．１５ｇを加えて、感圧接着剤用組成物（ａ２）を調製した。
この前記感圧接着剤用組成物（ａ２）を、剥離処理したポリエチレンテレフタレートフィルム（三菱樹脂株式会社製；商品名「ＭＲＦ７５」、厚み７５μｍ）の剥離処理した側に、厚みが３０μｍとなるようにシート状に塗工して紫外線吸収層（Ａ２）を成形した後、露出した粘着面に紫外線吸収剤含有のトリアセチルセルロースフィルム（富士フィルム株式会社製；商品名「フジタックＴＤ６０ＵＬ」）６０μｍを被服積層した。
このようにして得られた積層体を実施例２と同様の方法で処理し、両面粘着シート３を作製した。 [Example 3]
An acrylic resin obtained by copolymerizing 73 parts by mass of butyl acrylate (Tg-56 ° C.), 25 parts by mass of methyl methacrylate (Tg 105 ° C.) and 2 parts by mass of acrylic acid (Tg 106 ° C.) used in Example 1 above. 0.15 g of a polyisocyanate compound (manufactured by Asahi Kasei Co., Ltd .; trade name “Duranate 24A-100”) as a crosslinking agent is added to 1 kg of acid ester copolymer (Mw = 1,100,000), and a pressure-sensitive adhesive composition ( a2) was prepared.
The pressure-sensitive adhesive composition (a2) is peeled from a polyethylene terephthalate film (Mitsubishi Resin Co., Ltd .; trade name “MRF75”, thickness 75 μm) subjected to a peeling treatment so that the thickness becomes 30 μm. After coating the sheet to form the UV absorbing layer (A2), the exposed adhesive surface is coated with 60 μm of a triacetyl cellulose film containing UV absorber (Fuji Film Co., Ltd .; trade name “Fujitac TD60UL”). did.
Thus, the obtained laminated body was processed by the method similar to Example 2, and the double-sided adhesive sheet 3 was produced.

[実施例４]
未処理のポリエチレンテレフタレートフィルム（三菱樹脂株式会社製；商品名「ダイアホイルＴ−１００」、厚み３８μｍ）の片面に、テトラヒドロキシベンゾフェノンとアクリル樹脂バインダーとからなる紫外線吸収塗料を乾燥厚みが４μｍとなるよう塗布硬化させた。
実施例３で用いた感圧接着剤用組成物（ａ２）を、剥離処理したポリエチレンテレフタレートフィルム（三菱樹脂株式会社製；商品名「ＭＲＦ７５」、厚み７５μｍ）の剥離処理した側に、厚みが３０μｍとなるようにシート状に塗工して成形し、露出した粘着面に、先ほど作製した紫外線吸収塗膜が接するようフィルムを被覆積層し、紫外線吸収層（Ａ３）を作製した。
このようにして得られた積層体を実施例２と同様の方法で処理し、両面粘着シート４を作製した。 [Example 4]
On one side of an untreated polyethylene terephthalate film (Mitsubishi Resin Co., Ltd .; trade name “Diafoil T-100”, thickness 38 μm), an ultraviolet absorbing paint composed of tetrahydroxybenzophenone and an acrylic resin binder has a dry thickness of 4 μm. The coating was cured.
The thickness of the pressure-sensitive adhesive composition (a2) used in Example 3 is 30 μm on the side of the polyethylene terephthalate film (Mitsubishi Resin Co., Ltd .; trade name “MRF75”, thickness 75 μm) subjected to the release treatment. Then, the film was coated and molded into a sheet shape, and the film was coated and laminated so that the exposed adhesive surface was in contact with the previously prepared ultraviolet absorbing coating film, to prepare an ultraviolet absorbing layer (A3).
Thus, the obtained laminated body was processed by the method similar to Example 2, and the double-sided adhesive sheet 4 was produced.

[比較例１]
実施例１で用いた粘着剤組成物中の紫外線吸収剤を除いた以外は、実施例１と同様にして両面粘着シートを作製した。 [Comparative Example 1]
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the ultraviolet absorbent in the PSA composition used in Example 1 was removed.

＜評価＞
実施例・比較例で得た両面粘着シートについて、以下に示す試験を行い、評価した。評価結果は表１に示した。 <Evaluation>
About the double-sided adhesive sheet obtained by the Example and the comparative example, the test shown below was done and evaluated. The evaluation results are shown in Table 1.

（分光透過率）
実施例・比較例で作製した両面粘着シートを２枚のソーダライムガラス（厚み０．５ｍｍ）に挟み込むように貼着して試験片を作製した。作製した試験片の波長域２００〜８００ｎｍにおける光線透過率を分光光度計（島津製作所株式会社製；機器名「ＵＶ２４５０」）を用いて測定した。 (Spectral transmittance)
The double-sided PSA sheet prepared in Examples / Comparative Examples was attached so as to be sandwiched between two soda lime glasses (thickness 0.5 mm) to prepare test pieces. The light transmittance in a wavelength range of 200 to 800 nm of the prepared test piece was measured using a spectrophotometer (manufactured by Shimadzu Corporation; device name “UV2450”).

（接着力）
実施例・比較例で作製した両面粘着シートについて、一方の剥離フィルムを剥がし、裏打ちフィルムとしてポリエチレンテレフタレートフィルム（東洋紡績株式会社製；商品名「コスモシャインＡ４３００」、厚み１００μｍ）をハンドローラーにてロール圧着した。次に、これを１０ｍｍ巾×１００ｍｍ長の短冊状に裁断し、残る剥離フィルムを剥がして露出した粘着面をソーダライムガラスにハンドローラーを用いてロール貼着して、試験体を作製した。
このように作製した試験体を、常態にて２４時間養生した後、前記裏打ちフィルムをソーダライムガラスに対して１８０°をなす角度となるように剥離速度６０ｍｍ／分にて引っ張りながらガラスから粘着シートを剥離し、この際にロードセルで引っ張り強度を測定して、粘着シートのガラスに対する１８０°剥離強度を測定した。
実施例２、３、４については粘着シートの両表面側（Ｂ１およびＡ１、Ａ２、Ａ３）について剥離強度を測定した。 (Adhesive strength)
For the double-sided PSA sheets prepared in Examples and Comparative Examples, one release film is peeled off, and a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd .; trade name “Cosmo Shine A4300”, thickness 100 μm) is rolled with a hand roller as a backing film. Crimped. Next, this was cut into a strip shape of 10 mm width × 100 mm length, and the remaining peeled film was peeled off, and the exposed adhesive surface was roll-bonded to soda lime glass using a hand roller to prepare a test specimen.
The test specimen thus produced was cured for 24 hours in a normal state, and then the pressure-sensitive adhesive sheet was peeled from the glass while pulling the backing film at a peeling rate of 60 mm / min so as to form an angle of 180 ° with respect to soda lime glass. At this time, the tensile strength was measured with a load cell, and the 180 ° peel strength of the adhesive sheet with respect to the glass was measured.
For Examples 2, 3, and 4, the peel strength was measured on both surface sides (B1, A1, A2, A3) of the pressure-sensitive adhesive sheet.

（総合評価）
粘着力が５Ｎ／ｃｍ以上であって、波長３８０ｎｍの光線透過率が３０％以下であり、かつ波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上の場合を「○：good」と評価し、それ以外の場合を「×：poor」と評価し、総合評価（Ｔｏｔａｌ）として表に示した。 (Comprehensive evaluation)
A case where the adhesive strength is 5 N / cm or more, the light transmittance at a wavelength of 380 nm is 30% or less, and the visible light transmittance at a wavelength longer than the wavelength of 430 nm is 80% or more is indicated as “Good: The other cases were evaluated as “x: poor” and shown in the table as total evaluation (Total).

Figure 2012211305
Figure 2012211305

表１から分かるように、実施例で作製した両面粘着シート、すなわち本発明の画像表示装置用透明両面粘着シートは、紫外線吸収層を備え、かつこの紫外線吸収層が波長３８０ｎｍの光線透過率が３０％以下であって、波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であるという性質を備えるものであった。また、実施例で作製した両面粘着シート、すなわち本発明の画像表示装置用透明両面粘着シートは、所望の粘着力を兼ね備えていることから、画像表示装置における表面保護パネルと液晶モジュールの視認側との間に配設して、２つの部材を貼着・一体化させるために用いれば、画像表示装置の視認側から可視光を十分に透過して、視認性を確保することができ、かつ視認側から入射する紫外光から画像表示装置内の機能性フィルム等の機能性層を保護できるという機能を有するものであることが確認できた。   As can be seen from Table 1, the double-sided pressure-sensitive adhesive sheet produced in the example, that is, the transparent double-sided pressure-sensitive adhesive sheet for an image display device of the present invention is provided with an ultraviolet absorbing layer, and this ultraviolet absorbing layer has a light transmittance of 30 nm. %, And the visible light transmittance on the longer wavelength side than the wavelength of 430 nm is 80% or more. Moreover, since the double-sided pressure-sensitive adhesive sheet produced in the examples, that is, the transparent double-sided pressure-sensitive adhesive sheet for an image display device of the present invention has a desired adhesive force, the surface protection panel in the image display device and the viewing side of the liquid crystal module If the two members are used for adhering and integrating the two members, visible light can be sufficiently transmitted from the viewing side of the image display device, and visibility can be ensured. It was confirmed that the functional layer such as a functional film in the image display device can be protected from ultraviolet light incident from the side.

１ 紫外線吸収層
２ 透明支持体
３ 粘着剤層
４ 紫外線吸収層を有する透明支持体
５ 表面処理層
６ 表面保護パネル
７ 液晶モジュール
８ 光学フィルム等の機能性層
９ 本粘着シート


DESCRIPTION OF SYMBOLS 1 Ultraviolet absorption layer 2 Transparent support 3 Adhesive layer 4 Transparent support 5 which has an ultraviolet absorption layer Surface treatment layer 6 Surface protection panel 7 Liquid crystal module 8 Functional layers, such as an optical film 9, This adhesive sheet


Claims (8)

画像表示装置における表面保護パネルと液晶モジュールの視認側との間に配設して、２つの部材を一体化させるための両面粘着シートであって、
少なくとも１層の紫外線吸収層を有し、波長３８０ｎｍの光線透過率が３０％以下であり、かつ波長４３０ｎｍよりも長波長側における可視光透過率が８０％以上であることを特徴とする画像表示装置用透明両面粘着シート。 A double-sided pressure-sensitive adhesive sheet that is disposed between the surface protection panel in the image display device and the viewing side of the liquid crystal module to integrate the two members,
An image display comprising: at least one ultraviolet absorbing layer; a light transmittance at a wavelength of 380 nm is 30% or less; and a visible light transmittance at a wavelength longer than the wavelength of 430 nm is 80% or more. Transparent double-sided adhesive sheet for equipment. 透明支持体の一側又は両側に、少なくとも１層の紫外線吸収層が積層されてなる構成を備えた請求項１に記載の画像表示装置用透明両面粘着シート。   The transparent double-sided pressure-sensitive adhesive sheet for an image display device according to claim 1, comprising a configuration in which at least one ultraviolet absorbing layer is laminated on one side or both sides of the transparent support. 紫外線吸収層を有する透明支持体の一側又は両側に粘着剤層が積層されてなる構成を備えた請求項１に記載の画像表示装置用透明両面粘着シート。   The transparent double-sided adhesive sheet for image displays of Claim 1 provided with the structure by which an adhesive layer is laminated | stacked on the one side or both sides of the transparent support body which has a ultraviolet absorption layer. 透明支持体と粘着剤層との間に、添加剤の浮上防止のための表面処理層が介在してなる構成を備えた請求項３に記載の画像表示装置用透明両面粘着シート。   The transparent double-sided pressure-sensitive adhesive sheet for an image display device according to claim 3, comprising a structure in which a surface treatment layer for preventing the additive from floating is interposed between the transparent support and the pressure-sensitive adhesive layer. 紫外線吸収層が、紫外線吸収剤を含有する粘着剤組成物から形成されてなる層であることを特徴とする請求項１又は２に記載の画像表示装置用透明両面粘着シート。   The transparent double-sided pressure-sensitive adhesive sheet for an image display device according to claim 1 or 2, wherein the ultraviolet absorbing layer is a layer formed from a pressure-sensitive adhesive composition containing an ultraviolet absorber. 透明支持体が、セルロース系樹脂、ポリエステル系樹脂、（メタ）アクリル系樹脂、ポリカーボネート系樹脂、ポリオレフィン系樹脂、ポリスチレン系樹脂、ポリエーテル系樹脂、ポリフェニレン系樹脂からなる群より選ばれるいずれか１種以上の樹脂からなるものであることを特徴とする請求項２〜５の何れかに記載の画像表示装置用透明両面粘着シート。   The transparent support is any one selected from the group consisting of a cellulose resin, a polyester resin, a (meth) acrylic resin, a polycarbonate resin, a polyolefin resin, a polystyrene resin, a polyether resin, and a polyphenylene resin. The transparent double-sided pressure-sensitive adhesive sheet for an image display device according to any one of claims 2 to 5, wherein the transparent double-sided pressure-sensitive adhesive sheet is made of the above resin. 粘着剤層又は紫外線吸収層が、アクリル系粘着剤を含有することを特徴とする請求項２〜６の何れかに記載の画像表示装置用透明両面粘着シート。   The transparent double-sided pressure-sensitive adhesive sheet for an image display device according to claim 2, wherein the pressure-sensitive adhesive layer or the ultraviolet absorbing layer contains an acrylic pressure-sensitive adhesive. 請求項１〜７の何れかに記載の画像表示装置用透明両面粘着シートが、表面保護パネルと液晶モジュールの視認側との間に配設されてなる構成を備えた画像表示装置。
The image display apparatus provided with the structure by which the transparent double-sided adhesive sheet for image displays in any one of Claims 1-7 is arrange | positioned between the surface protection panel and the visual recognition side of a liquid crystal module.
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