TW201819566A - Optical double-sided adhesive tape - Google Patents

Optical double-sided adhesive tape Download PDF

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Publication number
TW201819566A
TW201819566A TW106122332A TW106122332A TW201819566A TW 201819566 A TW201819566 A TW 201819566A TW 106122332 A TW106122332 A TW 106122332A TW 106122332 A TW106122332 A TW 106122332A TW 201819566 A TW201819566 A TW 201819566A
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TW
Taiwan
Prior art keywords
adhesive layer
meth
adhesive
acrylate
adhesive tape
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TW106122332A
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Chinese (zh)
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TWI740975B (en
Inventor
三井数馬
野中崇弘
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日東電工股份有限公司
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Publication of TW201819566A publication Critical patent/TW201819566A/en
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Publication of TWI740975B publication Critical patent/TWI740975B/en

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    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • 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
    • C09J121/00—Adhesives based on unspecified rubbers
    • 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
    • C09J139/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
    • C09J139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • 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
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • 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
    • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
    • C09J183/04—Polysiloxanes
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention relates to a double-sided optical adhesive tape. The present invention provides an optical double-sided adhesive tape that is suitable for achieving good hand-tear property and high reworkability together on a polyester-based substrate. The adhesive tape (X) has a laminated structure including a base material (10) as a transparent base material, an adhesive layer (11), and an adhesive layer (12) The substrate (10) is a uniaxially stretched polyester-based substrate in the width direction of the substrate and is located between the adhesive layers (11, 12) and has a thickness of 75 [mu]m or more. The Elmendorf tear strength in the substrate width direction of the adhesive tape (X) is 0.5 N or less, and the Elmendorf tear strength in the substrate length direction of the adhesive tape (X) is 1N above.

Description

光學用雙面黏著帶Optical double-sided adhesive tape

本發明係關於一種具有光透過性之光學用途之雙面黏著帶。The present invention relates to a double-sided adhesive tape for optical use having optical transparency.

於平板顯示器之技術領域中，於顯示裝置之製造中利用光學用雙面黏著帶。具體而言，液晶顯示器等顯示裝置或觸控面板等輸入裝置具有包含各種基板或膜體之積層構造部之情況下，存在以下情形：為了於該積層構造內將相鄰之特定零件間接合，或者為了填充相鄰零件間之間隙，而使用透明之雙面黏著帶。關於此種光學用雙面黏著帶，例如係記載於下述之專利文獻1～3中。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利特開2012-78431號公報 [專利文獻2]日本專利特開2015-200698號公報 [專利文獻3]日本專利特開2016-26321號公報In the technical field of flat panel displays, optical double-sided adhesive tapes are used in the manufacture of display devices. Specifically, when a display device such as a liquid crystal display or an input device such as a touch panel has a laminated structure including various substrates or films, there are cases in which adjacent specific parts are joined in the laminated structure. Or in order to fill the gap between adjacent parts, use a transparent double-sided adhesive tape. Such an optical double-sided adhesive tape is described in Patent Documents 1 to 3 described below, for example. [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2012-78431 [Patent Literature 2] Japanese Patent Laid-Open No. 2015-200698 [Patent Literature 3] Japanese Patent Laid-Open No. 2016-26321 Bulletin

[發明所欲解決之問題] 作為上述光學用雙面黏著帶之基材，就耐熱性、或透明性、尺寸穩定性等各種特性優異之方面而言，存在採用聚酯系基材之情形。關於作為用於光學用雙面黏著帶等之光學用途之聚酯系基材的例如PET膜，已知大多情況下於製造製程上，於藉由T模法將原料樹脂材料擠出成形為膜狀後，歷經包含該膜之行進方向或機械方向(MD)上之延伸與寬度方向(TD)上之延伸的雙軸延伸處理。 又，關於光學用雙面黏著帶，就作業效率等觀點而言，亦存在要求良好之手撕性之情形。 本發明係基於以上般之情況而想出，其目的在於提供一種適於一面具有聚酯系基材一面一併實現良好之手撕性與較高之二次加工性的光學用雙面黏著帶。 [解決問題之技術手段] 藉由本發明所提供之光學用雙面黏著帶具有包含第1黏著劑層、第2黏著劑層、及該第1及第2黏著劑層之間的透明基材之積層構造。透明基材為基材寬度方向單軸延伸聚酯系基材，且具有75 μm以上之厚度。所謂聚酯系基材，係指於構成材料中以最大重量比率含有聚酯系樹脂之膜或片材等基材。所謂基材寬度方向單軸延伸聚酯系基材，係指於聚酯系基材之製造製程中，於原料樹脂材料之擠出成形後，歷經與例如膜狀之擠出成形體之行進方向或機械方向(MD)正交的寬度方向(TD)上之單軸延伸處理的聚酯系基材。第1黏著劑層及/或第2黏著劑層例如包含選自由丙烯酸系黏著劑、胺基甲酸酯系黏著劑、聚矽氧系黏著劑、及橡膠系黏著劑所組成之群中之至少一種。於本光學用雙面黏著帶中，基材寬度方向之艾勉道夫(Elmendorf)撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上。具備以上之構成之本光學用雙面黏著帶可採用帶有用以將各黏著劑層之黏著面被覆而進行保護的剝離襯墊之片材狀形態，亦可採用以將本光學用雙面黏著帶與剝離襯墊交替配置之方式帶有剝離襯墊並經捲繞成捲狀之形態。 本光學用雙面黏著帶所具有之透明基材如上述般為聚酯系基材。此種構成係對於使雙面黏著帶基材甚至本光學用雙面黏著帶享有耐熱性、或透明性、尺寸穩定性等聚酯系基材容易表現出之各種特性而言較佳。 又，本光學用雙面黏著帶所具有之透明基材如上述般為厚度75 μm以上之寬度方向單軸延伸聚酯系基材。雙面黏著帶之艾勉道夫撕裂強度等撕裂強度受到基材之機械特性之強烈支配之情況下，此種構成係適於使本光學用雙面黏著帶實現基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上的上述構成。 此外，本光學用雙面黏著帶如上述般，基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上。此種構成係適於使本光學用雙面黏著帶實現艾勉道夫撕裂強度相對顯著地低至0.5 N以下的基材寬度方向上之良好手撕性。並且，艾勉道夫撕裂強度於基材機械方向上為基材寬度方向之2倍以上之1 N以上的構成係對於使本光學用雙面黏著帶提高基材寬度方向上之撕裂之指向性而言較佳。因此，該構成係對於以下情況而言較佳：於處於將本光學用雙面黏著帶貼合於被接著體之狀態下之情形時，使剝離力作用於該黏著帶之基材機械方向，在不撕裂該黏著帶之情況下使其自被接著體適當地剝離。具體而言係對於以下情況而言較佳：於將本光學用雙面黏著帶貼合於被接著體後暫且剝離並再次進行貼合之作業(二次加工作業)時，使剝離力作用於該黏著帶之基材機械方向，在不撕裂該黏著帶之情況下使其自被接著體適當地剝離。除基材寬度方向以外於基材機械方向上亦容易被撕裂之光學用雙面黏著帶存在以下傾向：於二次加工作業中之剝離時容易破裂，難以自被接著體適當地剝離。產生了破裂之光學用雙面黏著帶無法用於再次之貼合。相對於此，本光學用雙面黏著帶具有與適於實現基材寬度方向上之良好手撕性的基材寬度方向艾勉道夫撕裂強度相比充分大之基材機械方向艾勉道夫撕裂強度，因此適於在二次加工作業時，在不撕裂之情況下自被接著體適當地剝離。 如以上所述，本光學用雙面黏著帶係適於一面具有聚酯系基材一面一併實現良好之手撕性與較高之二次加工性。 較佳為第1黏著劑層之厚度為5 μm以上，且第2黏著劑層之厚度為5 μm以上。此種構成係於使光學用雙面黏著帶實現對被接著體之充分之黏著力的方面而言較佳。 較佳為本光學用雙面黏著帶之厚度方向之霧度為3%以下。此種構成係對於要求透明性之光學用黏著帶而言較佳。[Problems to be Solved by the Invention] As a substrate of the above-mentioned double-sided adhesive tape for optical use, a polyester-based substrate may be used in terms of excellent heat resistance, transparency, and dimensional stability. It is known that, for example, a PET film which is a polyester-based substrate used for optical applications such as double-sided adhesive tapes for optics, it is known that a raw resin material is extruded into a film by a T-die method in a manufacturing process. After being shaped, the film is subjected to a biaxial stretching process including an extension in the traveling direction or the machine direction (MD) and an extension in the width direction (TD) of the film. In addition, regarding the double-sided adhesive tape for optical use, in terms of work efficiency and the like, there are cases in which good hand tearability is required. The present invention was conceived based on the above-mentioned circumstances, and an object thereof is to provide an optical double-sided adhesive tape suitable for achieving good hand tearability and high secondary processability while having a polyester-based substrate on one side. . [Technical means to solve the problem] The optical double-sided adhesive tape provided by the present invention has a transparent substrate including a first adhesive layer, a second adhesive layer, and a transparent substrate between the first and second adhesive layers. Laminated structure. The transparent substrate is a uniaxially stretched polyester-based substrate in the width direction of the substrate, and has a thickness of 75 μm or more. The polyester-based substrate refers to a substrate such as a film or a sheet containing a polyester-based resin in a maximum weight ratio among the constituent materials. The so-called uniaxially stretched polyester-based substrate in the width direction of the substrate refers to the direction of travel of the extruded molded body such as a film-like material after the extrusion molding of the raw resin material in the manufacturing process of the polyester-based substrate. Or a uniaxially stretched polyester substrate in the width direction (TD) orthogonal to the machine direction (MD). The first adhesive layer and / or the second adhesive layer include, for example, at least one selected from the group consisting of an acrylic adhesive, a urethane adhesive, a silicone adhesive, and a rubber adhesive. One. In this optical double-sided adhesive tape, the Elmendorf tear strength in the width direction of the substrate is 0.5 N or less, and the Elmendorf tear strength in the mechanical direction of the substrate is 1 N or more. The optical double-sided adhesive tape having the above configuration may be in the form of a sheet with a release liner for covering and protecting the adhesive surface of each adhesive layer, or may be used to adhere the optical double-sided adhesive The tape and the release liner are arranged alternately. The release liner is provided and wound into a roll shape. The transparent base material included in the optical double-sided adhesive tape is a polyester base material as described above. Such a structure is preferable for allowing the double-sided adhesive tape substrate and even the optical double-sided adhesive tape to enjoy various characteristics that are easily exhibited by polyester-based substrates such as heat resistance, transparency, and dimensional stability. The transparent substrate included in the optical double-sided adhesive tape is a uniaxially stretched polyester-based substrate having a thickness of 75 μm or more in the width direction as described above. When the tear strength, such as the tear strength of the double-sided adhesive tape, is strongly controlled by the mechanical properties of the substrate, this structure is suitable for the optical double-sided adhesive tape to realize the thickness of the substrate in the width direction. The above-mentioned configuration in which the doffer tear strength is 0.5 N or less, and the Emmy Doffer tear strength in the mechanical direction of the substrate is 1 N or more. In addition, as described above, the optical double-faced adhesive tape has an Emmendorf tear strength in the width direction of the substrate of 0.5 N or less, and an Emmendorf tear strength in the mechanical direction of the substrate of 1 N or more. Such a structure is suitable for enabling the present double-sided adhesive tape to achieve good hand tearability in the substrate width direction in which the Emmandorf tear strength is relatively significantly lower than 0.5 N. In addition, the configuration of the Emmydorff tear strength in the mechanical direction of the substrate is 2 times or more and 1 N or more in the width direction of the substrate. The direction is to make the double-sided adhesive tape for optical use to increase the tear in the substrate width direction. Better in terms of sex. Therefore, this configuration is preferable for the case where the optical double-sided adhesive tape is bonded to the adherend, and a peeling force is applied to the mechanical direction of the base material of the adhesive tape. The adhesive tape was appropriately peeled from the adherend without tearing the adhesive tape. Specifically, it is preferable to apply the peeling force to the double-sided adhesive tape for optical bonding after it is bonded to the adherend and then bonded again (secondary processing operation). In the mechanical direction of the base material of the adhesive tape, the adhesive tape is appropriately peeled from the adherend without tearing the adhesive tape. In addition to the substrate width direction, the optical double-sided adhesive tape that is easily torn in the mechanical direction of the substrate also tends to be easily broken during peeling in a secondary processing operation, and it is difficult to properly peel from the adherend. The optical double-sided adhesive tape that has been cracked cannot be used for re-attachment. On the other hand, the optical double-sided adhesive tape has a substrate with a mechanical strength in the direction of the Eimerdorf that is sufficiently larger than the Eimerdorf tearing strength of the substrate in the width direction of the substrate which is suitable for achieving good hand tearability in the width direction of the substrate. The tear strength is suitable for proper peeling from the adherend without tearing during the secondary processing operation. As described above, the optical double-sided adhesive tape system is suitable for realizing good hand tearability and high secondary processability while having a polyester-based substrate on one side. The thickness of the first adhesive layer is preferably 5 μm or more, and the thickness of the second adhesive layer is preferably 5 μm or more. Such a configuration is preferable in that the double-sided adhesive tape for optics achieves sufficient adhesion to the adherend. The haze in the thickness direction of the optical double-sided adhesive tape is preferably 3% or less. Such a structure is preferable for an optical adhesive tape which requires transparency.

圖1係作為本發明之一實施形態之光學用雙面黏著帶之黏著帶X的局部剖視圖。黏著帶X具有包含作為透明基材之基材10、作為第1黏著劑層之黏著劑層11、及作為第2黏著劑層之黏著劑層12之積層構造。黏著帶X例如可於平板顯示器等顯示裝置之製造中利用。液晶顯示器等顯示裝置或觸控面板等輸入裝置具有包含各種基板或膜體之積層構造部之情況下，為了於該積層構造內將相鄰之特定零件間接合，或者為了填充相鄰零件間之間隙，可利用黏著帶X。 黏著帶X所具有之基材10係於黏著帶X中位於黏著劑層11、12間並作為支持體而發揮功能之部位，且為具有光透過性之基材寬度方向單軸延伸聚酯系基材。 所謂聚酯系基材，係指於構成材料中以最大重量比率含有聚酯系樹脂之膜或片材等基材。作為此種基材10之構成材料，例如可列舉：聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯、及聚對苯二甲酸-1,4-環己二甲酯。 所謂基材寬度方向單軸延伸聚酯系基材，係指於聚酯系基材之製造製程中，於原料樹脂材料之擠出成形後，歷經與例如膜狀之押出成形體之行進方向或機械方向(MD)正交的寬度方向(TD)上之單軸延伸處理的聚酯系基材。關於作為此種寬度方向單軸延伸聚酯系基材的基材10之寬度方向之延伸倍率，較佳為2.5倍以上，更佳為3倍以上。又，關於該延伸倍率，較佳為6倍以下，更佳為5.5倍以下。 基材10之厚度為75 μm以上，較佳為80 μm以上。又，基材10之厚度較佳為150 μm以下，更佳為125 μm以下。 基材10之面內相位差較佳為1500 nm以上，更佳為3000 nm以上，更佳為6000 nm以上。於本實施形態中，所謂基材10之面內相位差，係指與使波長590 nm之光於23℃下透過基材10時之雙折射有關的於與基材10之主面平行之面內直行的兩個光學主軸(遲相軸與進相軸)中在遲相軸方向上振動之偏光成分(異常光線)與在進相軸方向上振動之偏光成分(正常光線)之間所產生的相位差。該面內相位差係於將異常光線之折射率(相對較大)設為nx，將正常光線之折射率(相對較小)設為ny，將基材10之厚度設為d(nm)之情形時，設為由(nx－ny)×d所表示之值。 基材10之黏著劑層11側之表面及黏著劑層12側之表面亦可分別實施用以提高與黏著劑層之密接性之表面處理。作為此種表面處理，可列舉電暈處理或電漿處理等物理處理、及底塗處理等化學處理。 黏著帶X之黏著劑層11、12分別含有黏著劑作為主劑，且具有光透過性。所謂主劑，係設為含有成分中占最大重量比率之成分。黏著劑層11及/或黏著劑層12例如包含選自由作為丙烯酸系黏著劑之丙烯酸系聚合物、作為胺基甲酸酯系黏著劑之聚胺基甲酸酯、聚矽氧系黏著劑、及橡膠系黏著劑所組成之群中之至少一種。就一併實現光學用雙面黏著帶之黏著劑層所要求之程度之黏著力與較高之透明性的觀點而言，作為黏著劑層11、12中之黏著劑，較佳為採用丙烯酸系聚合物。又，黏著劑層11具有可貼附於被接著體之黏著面11a，黏著劑層12具有可貼附於被接著體之黏著面12a。 於黏著劑層11及/或黏著劑層12含有作為丙烯酸系黏著劑之丙烯酸系聚合物之情形時，較佳為該丙烯酸系聚合物包含源自具有直鏈狀或分支鏈狀烷基之丙烯酸烷基酯、及/或具有直鏈狀或分支鏈狀烷基之甲基丙烯酸烷基酯的單體單元作為以重量比率計最多之單體單元。以下，以「(甲基)丙烯酸」表示「丙烯酸」及/或「甲基丙烯酸」。 作為用以形成上述丙烯酸系聚合物之單體單元的具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯、即用以形成上述丙烯酸系聚合物之單體成分所包含的具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯，例如可列舉：(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸異丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸第二丁酯、(甲基)丙烯酸異丁酯、(甲基)丙烯酸第三丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸異戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸庚酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸異辛酯、(甲基)丙烯酸壬酯、(甲基)丙烯酸異壬酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸異癸酯、(甲基)丙烯酸十一烷基酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸十三烷基酯、(甲基)丙烯酸十四烷基酯、(甲基)丙烯酸十五烷基酯、(甲基)丙烯酸十六烷基酯、(甲基)丙烯酸十七烷基酯、(甲基)丙烯酸十八烷基酯、(甲基)丙烯酸異硬脂酯、(甲基)丙烯酸十九烷基酯、及(甲基)丙烯酸二十烷基酯等具有碳數為1～20之直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯。作為用於丙烯酸系聚合物之該(甲基)丙烯酸烷基酯，可使用一種(甲基)丙烯酸烷基酯，亦可使用兩種以上之(甲基)丙烯酸烷基酯。於本實施形態中，作為用於丙烯酸系聚合物之該(甲基)丙烯酸烷基酯，較佳為使用選自由丙烯酸正丁酯、丙烯酸2-乙基己酯、及丙烯酸異硬脂酯所組成之群中之至少一種。 上述丙烯酸系聚合物中之源自具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯之單體單元的比率較佳為50重量%以上，更佳為60重量%以上，更佳為70重量%以上，更佳為80重量%以上，更佳為90重量%以上。即，用以形成該丙烯酸系聚合物之原料的單體成分組成中之(甲基)丙烯酸烷基酯的比率較佳為50重量%以上，更佳為60重量%以上，更佳為70重量%以上，更佳為80重量%以上，更佳為90重量%以上。上述丙烯酸系聚合物具有源自帶有此種(甲基)丙烯酸烷基酯比率之單體成分組成之單體單元構成。與具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯之比率有關的該構成係於以下方面而言較佳：使包含該丙烯酸系聚合物所形成之黏著劑層適當地表現出作為丙烯酸系黏著劑之丙烯酸系聚合物之黏著性等基本特性。 黏著劑層11或黏著劑層12所含有之丙烯酸系聚合物亦可包含源自脂環式單體之單體單元。作為用以形成丙烯酸系聚合物之單體單元的脂環式單體、即用以形成該丙烯酸系聚合物之單體成分所包含的脂環式單體，例如可列舉：(甲基)丙烯酸環烷基酯、具有二環式烴環之(甲基)丙烯酸酯、及具有三環以上之烴環之(甲基)丙烯酸酯。作為(甲基)丙烯酸環烷基酯，例如可列舉：(甲基)丙烯酸環戊酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸環庚酯、及(甲基)丙烯酸環辛酯。作為具有二環式烴環之(甲基)丙烯酸酯，例如可列舉(甲基)丙烯酸基酯及(甲基)丙烯酸異基酯。作為具有三環以上之烴環之(甲基)丙烯酸酯，例如可列舉：(甲基)丙烯酸二環戊酯、(甲基)丙烯酸二環戊氧基乙酯、(甲基)丙烯酸三環戊酯、(甲基)丙烯酸1-金剛烷基酯、(甲基)丙烯酸2-甲基-2-金剛烷基酯、及(甲基)丙烯酸2-乙基-2-金剛烷基酯。作為用於丙烯酸系聚合物之脂環式單體，可使用一種脂環式單體，亦可使用兩種以上之脂環式單體。本實施形態中，作為用於丙烯酸系聚合物之脂環式單體，較佳為使用選自由丙烯酸環己酯、甲基丙烯酸環己酯、丙烯酸異基酯、及甲基丙烯酸異基酯所組成之群中之至少一種。 關於上述丙烯酸系聚合物中之源自脂環式單體之單體單元的比率，就使包含該丙烯酸系聚合物所形成之黏著劑層實現適度之柔軟性之觀點而言，較佳為5～60重量%，更佳為10～50重量%。 黏著劑層11或黏著劑層12所含有之丙烯酸系聚合物亦可包含源自含羥基之單體之單體單元。含羥基之單體係於單體單元內具有至少一個羥基之單體。於黏著劑層11、12內之丙烯酸系聚合物包含含羥基之單體單元之情形時，黏著劑層11、12容易獲得接著性或適度之凝集力。 作為用以形成上述丙烯酸系聚合物之單體單元的含羥基之單體、即用以形成該丙烯酸系聚合物之單體成分所包含的含羥基之單體，例如可列舉：含羥基之(甲基)丙烯酸酯、乙烯醇、及烯丙醇。作為含羥基之(甲基)丙烯酸酯，例如可列舉：(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸3-羥基丙酯、(甲基)丙烯酸4-羥基丁酯、(甲基)丙烯酸6-羥基己酯、(甲基)丙烯酸羥基辛酯、(甲基)丙烯酸羥基癸酯、(甲基)丙烯酸羥基月桂酯、及(甲基)丙烯酸(4-羥基甲基環己基)甲酯。作為用於丙烯酸系聚合物之含羥基之單體，可使用一種含羥基之單體，亦可使用兩種以上之含羥基之單體。於本實施形態中，作為用於丙烯酸系聚合物之含羥基之單體，較佳為使用選自由丙烯酸2-羥基乙酯、甲基丙烯酸2-羥基乙酯、丙烯酸2-羥基丙酯、甲基丙烯酸2-羥基丙酯、丙烯酸4-羥基丁酯、及甲基丙烯酸4-羥基丁酯所組成之群中之至少一種。 上述丙烯酸系聚合物中之源自含羥基之單體之單體單元的比率較佳為1重量%以上，更佳為2重量%以上，更佳為3重量%以上，更佳為5重量%以上，更佳為7重量%以上，更佳為10重量%以上。上述丙烯酸系聚合物中之源自含羥基之單體之單體單元的比率較佳為20重量%以下，更佳為18重量%以下。與含羥基之單體之比率有關的該等構成係於使包含該丙烯酸系聚合物所形成之黏著劑層實現接著性或適度之凝集力之方面而言較佳。 黏著劑層11或黏著劑層12所含有之丙烯酸系聚合物亦可包含源自含氮原子之單體之單體單元。含氮原子之單體係於單體單元內具有至少一個氮原子之單體。於黏著劑層11、12內之丙烯酸系聚合物包含含氮原子之單體單元之情形時，黏著劑層11、12容易獲得硬度或良好之接著可靠性。 作為用以形成上述丙烯酸系聚合物之單體單元的含氮原子之單體、即用以形成該丙烯酸系聚合物之單體成分所包含的含氮原子之單體，例如可列舉N-乙烯基環狀醯胺及(甲基)丙烯醯胺類。關於作為含氮原子之單體之N-乙烯基環狀醯胺，例如可列舉：N-乙烯基-2-吡咯啶酮、N-乙烯基-2-哌啶酮、N-乙烯基-3-啉酮、N-乙烯基-2-己內醯胺、N-乙烯基-1,3-㗁-2-酮、及N-乙烯基-3,5-啉二酮。關於作為含氮原子之單體之(甲基)丙烯醯胺類，例如可列舉：(甲基)丙烯醯胺、N-乙基(甲基)丙烯醯胺、N-異丙基(甲基)丙烯醯胺、N-正丁基(甲基)丙烯醯胺、N-辛基(甲基)丙烯醯胺、N,N-二甲基(甲基)丙烯醯胺、N,N-二乙基(甲基)丙烯醯胺、N,N-二丙基(甲基)丙烯醯胺、及N,N-二異丙基(甲基)丙烯醯胺。作為用於丙烯酸系聚合物之含氮原子之單體，可使用一種含氮原子之單體，亦可使用兩種以上之含氮原子之單體。於本實施形態中，作為用於丙烯酸系聚合物之含氮原子之單體，較佳為使用N-乙烯基-2-吡咯啶酮。 關於上述丙烯酸系聚合物中之源自含氮原子之單體之單體單元的比率，就使包含該丙烯酸系聚合物所形成之黏著劑層實現適度之硬度、或接著性、透明性之觀點而言，較佳為1重量%以上，更佳為3重量%以上，更佳為5重量%以上。又，關於上述丙烯酸系聚合物中之源自含氮原子之單體之單體單元的比率，就使包含該丙烯酸系聚合物所形成之黏著劑層實現充分之透明性之觀點、或抑制變得過硬而實現良好之接著可靠性之觀點而言，較佳為30重量%以下，更佳為25重量%以下。 黏著劑層11或黏著劑層12所含有之丙烯酸系聚合物亦可包含源自含羧基之單體之單體單元。含羧基之單體係於單體單元內具有至少一個羧基之單體。於黏著劑層11、12內之丙烯酸系聚合物包含含羧基之單體單元之情形時，存在黏著劑層11、12容易獲得良好之接著可靠性之情況。 作為用以形成上述丙烯酸系聚合物之單體單元的含羧基之單體、即用以形成該丙烯酸系聚合物之單體成分所包含的含羧基之單體，例如可列舉：(甲基)丙烯酸、亞甲基丁二酸、順丁烯二酸、反丁烯二酸、丁烯酸、及異丁烯酸。作為用於丙烯酸系聚合物之含羧基之單體，可使用一種含羧基之單體，亦可使用兩種以上之含羧基之單體。於本實施形態中，作為用於丙烯酸系聚合物之含羧基之單體，較佳為使用丙烯酸。 關於上述丙烯酸系聚合物中之源自含羧基之單體之單體單元的比率，就使包含該丙烯酸系聚合物所形成之黏著劑層獲得於被接著體表面存在極性基之情形時的與該極性基之相互作用之幫助而確保良好之接著可靠性的觀點而言，較佳為0.1重量%以上，更佳為0.5重量%以上。又，關於上述丙烯酸系聚合物中之源自含羧基之單體之單體單元的比率，就抑制包含該丙烯酸系聚合物所形成之黏著劑層變得過硬而實現良好之接著可靠性的觀點而言，較佳為20重量%以下，更佳為15重量%以下。 黏著劑層11或黏著劑層12所含有之丙烯酸系聚合物亦可具有源自作為共聚合性交聯劑之多官能(甲基)丙烯酸酯之交聯結構。作為多官能(甲基)丙烯酸酯，例如可列舉：1,6-己二醇二(甲基)丙烯酸酯、丁二醇二(甲基)丙烯酸酯、(聚)乙二醇二(甲基)丙烯酸酯、(聚)丙二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、季戊四醇二(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、四羥甲基甲烷三(甲基)丙烯酸酯、(甲基)丙烯酸烯丙酯、及(甲基)丙烯酸乙烯酯。作為用於丙烯酸系聚合物之多官能(甲基)丙烯酸酯，可使用一種多官能(甲基)丙烯酸酯，亦可使用兩種以上之多官能(甲基)丙烯酸酯。本實施形態中，作為用於丙烯酸系聚合物之多官能(甲基)丙烯酸酯，較佳為使用選自由1,6-己二醇二丙烯酸酯、二季戊四醇六丙烯酸酯、及三羥甲基丙烷三丙烯酸酯所組成之群中之至少一種。 上述丙烯酸系聚合物中之源自多官能(甲基)丙烯酸酯之單體單元的比率較佳為0.01重量%以上，更佳為0.03重量%以上，更佳為0.05重量%以上。上述丙烯酸系聚合物中之源自多官能(甲基)丙烯酸酯之單體單元的比率較佳為1重量%以下，更佳為0.5重量%以下。與多官能(甲基)丙烯酸酯之比率有關的該等構成係於使包含該丙烯酸系聚合物所形成之黏著劑層實現適度之硬度或接著性的方面而言較佳。 於黏著劑層11及/或黏著劑層12含有以上般之丙烯酸系聚合物作為黏著劑之情形時，黏著劑層中之該丙烯酸系聚合物之含有率例如為85～100重量%。 黏著劑層11、12就分別實現室溫下之較高之黏著性之觀點而言，例如亦可含有原料單體組成與上述丙烯酸系聚合物不同之丙烯酸系低聚物。於黏著劑層11及/或黏著劑層12含有此種丙烯酸系低聚物之情形時，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，黏著劑層中之丙烯酸系低聚物之含量例如為0.1～20重量份。 上述低聚物較佳為包含源自具有環狀結構之(甲基)丙烯酸酯(含有環之(甲基)丙烯酸酯)之單體單元、與源自具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯之單體單元的聚合物。 作為用以形成上述低聚物之單體單元的含有環之(甲基)丙烯酸酯、即用以形成該低聚物之單體成分所包含的含有環之(甲基)丙烯酸酯，例如可列舉：(甲基)丙烯酸環烷基酯、具有二環式烴環之(甲基)丙烯酸酯、具有三環以上之烴環之(甲基)丙烯酸酯、及具有芳香族環之(甲基)丙烯酸酯。作為(甲基)丙烯酸環烷基酯，例如可列舉：(甲基)丙烯酸環戊酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸環庚酯、及(甲基)丙烯酸環辛酯。作為具有二環式烴環之(甲基)丙烯酸酯，例如可列舉(甲基)丙烯酸基酯及(甲基)丙烯酸異基酯。作為具有三環以上之烴環之(甲基)丙烯酸酯，例如可列舉：(甲基)丙烯酸二環戊酯、(甲基)丙烯酸二環戊氧基乙酯、(甲基)丙烯酸三環戊酯、(甲基)丙烯酸1-金剛烷基酯、(甲基)丙烯酸2-甲基-2-金剛烷基酯、及(甲基)丙烯酸2-乙基-2-金剛烷基酯。作為具有芳香族環之(甲基)丙烯酸酯，例如可列舉：(甲基)丙烯酸苯基酯、(甲基)丙烯酸苯氧基乙酯、及(甲基)丙烯酸苄酯。作為用於低聚物之含有環之(甲基)丙烯酸酯，可使用一種含有環之(甲基)丙烯酸酯，亦可使用兩種以上之含有環之(甲基)丙烯酸酯。於本實施形態中，作為用於低聚物之含有環之(甲基)丙烯酸酯，較佳為使用選自由丙烯酸二環戊酯及甲基丙烯酸二環戊酯所組成之群中之至少一種。 關於上述低聚物中之源自含有環之(甲基)丙烯酸酯之單體單元的比率，就使包含該低聚物所形成之黏著劑層實現適度之柔軟性之觀點而言，較佳為10～90重量%，更佳為20～80重量%，更佳為35～80重量%。 作為用以形成上述低聚物之單體單元的具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯、即用以形成該低聚物之單體成分所包含的具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯，例如可列舉：(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸異丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸第二丁酯、(甲基)丙烯酸異丁酯、(甲基)丙烯酸第三丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸異戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸庚酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸異辛酯、(甲基)丙烯酸壬酯、(甲基)丙烯酸異壬酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸異癸酯、(甲基)丙烯酸十一烷基酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸十三烷基酯、(甲基)丙烯酸十四烷基酯、(甲基)丙烯酸十五烷基酯、(甲基)丙烯酸十六烷基酯、(甲基)丙烯酸十七烷基酯、(甲基)丙烯酸十八烷基酯、(甲基)丙烯酸異硬脂酯、(甲基)丙烯酸十九烷基酯、及(甲基)丙烯酸二十烷基酯等具有碳數為1～20之直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯。作為用於上述低聚物之該(甲基)丙烯酸烷基酯，可使用一種(甲基)丙烯酸烷基酯，亦可使用兩種以上之(甲基)丙烯酸烷基酯。本實施形態中，作為用於上述低聚物之該(甲基)丙烯酸烷基酯，較佳為使用甲基丙烯酸甲酯。 關於上述低聚物中之源自具有直鏈狀或分支鏈狀烷基之(甲基)丙烯酸烷基酯之單體單元的比率，就使包含該低聚物所形成之黏著劑層實現適度之彈性模數之觀點而言，較佳為10～90重量%，更佳為15～80重量%，更佳為20～60重量%。 又，上述低聚物亦可包含源自含羧基之單體、或含醯胺基之單體、含胺基之單體、含氰基之單體、含磺酸基之單體、含磷酸基之單體、含異氰酸基之單體、含醯亞胺基之單體的單體單元。 上述低聚物之重量平均分子量(Mw)例如為1000～30000，較佳為1000～20000，更佳為1500～10000。就使包含上述低聚物所形成之黏著劑層確保良好之黏著力的觀點而言，該低聚物之重量平均分子量較佳為1000以上。另一方面，就使包含上述低聚物所形成之黏著劑層確保尤其是室溫下之黏著力之觀點而言，該低聚物之重量平均分子量較佳為30000以下。 上述低聚物之重量平均分子量可藉由凝膠滲透層析(GPC)法進行測定。例如可使用GPC測定裝置(商品名「HLC-8120GPC」，Tosoh股份有限公司製造)，於下述之測定條件下以標準聚苯乙烯換算值之形式求出重量平均分子量(Mw)。 ・管柱：將TSKgel Super AWM-H(上游側，Tosoh股份有限公司製造)、TSKgel Super AW4000(Tosoh股份有限公司製造)、及TSKgel Super AW2500(下游側，Tosoh股份有限公司製造)串列連接 ・管柱尺寸：各管柱均為6.0 mm×150 mm ・管柱溫度(測定溫度)：40℃ ・溶離液：四氫呋喃(THF) ・流量：0.4 mL/分鐘 ・樣品注入量：20 μL ・樣品濃度：約2.0 g/L(四氫呋喃溶液) ・標準試樣：聚苯乙烯 ・檢測器：示差折射計(RI) 黏著劑層11、12亦可分別含有矽烷偶合劑。作為矽烷偶合劑，例如可列舉：γ-縮水甘油氧基丙基三甲氧基矽烷、γ-縮水甘油氧基丙基三乙氧基矽烷、γ-胺基丙基三甲氧基矽烷、及N-苯基-胺基丙基三甲氧基矽烷。作為矽烷偶合劑，亦可列舉商品名「KBM-403」(信越化學工業股份有限公司製造)等市售品。作為矽烷偶合劑，較佳為γ-縮水甘油氧基丙基三甲氧基矽烷。 於黏著劑層11及/或黏著劑層12含有矽烷偶合劑之情形時，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，黏著劑層中之矽烷偶合劑之含量較佳為0.01重量份以上，更佳為0.02重量份以上。又，相對於丙烯酸系聚合物100重量份，黏著劑層中之矽烷偶合劑之含量較佳為1重量份以下，更佳為0.5重量份以下。與矽烷偶合劑之含量有關的該構成係於使包含該矽烷偶合劑所形成之黏著劑層實現加濕條件下之較高之接著性、尤其是對玻璃之較高之接著性的方面而言較佳。 黏著劑層11、12亦可分別含有紫外線吸收劑。紫外線吸收劑係可高效率地吸收紫外線且可將所吸收之能量轉換為熱或紅外線等並釋出之化學種。作為此種紫外線吸收劑，例如可列舉：苯并三唑系紫外線吸收劑、羥基苯基三系紫外線吸收劑、水楊酸酯系紫外線吸收劑、二苯甲酮系紫外線吸收劑、氧基二苯甲酮系紫外線吸收劑、及氰基丙烯酸酯系紫外線吸收劑。黏著劑層11及/或黏著劑層12可含有一種紫外線吸收劑，亦可含有兩種以上之紫外線吸收劑。 作為苯并三唑系紫外線吸收劑，例如可列舉：2-(2-羥基-5-第三丁基苯基)-2H-苯并三唑(商品名「TINUVIN PS」，BASF公司製造)、苯丙酸3-(2H-苯并三唑-2-基)-5-(1,1-二甲基乙基)-4-羥基之碳數7～9之烷基酯(商品名「TINUVIN 384-2」，BASF公司製造)、3-[3-第三丁基-4-羥基-5-(5-氯-2H-苯并三唑-2-基)苯基]丙酸辛酯及3-[3-第三丁基-4-羥基-5-(5-氯-2H-苯并三唑-2基)苯基]丙酸2-乙基己酯之混合物(商品名「TINUVIN 109」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4,6-雙(1-甲基-1-苯基乙基)苯酚(商品名「TINUVIN 900」，BASF公司製造)、2-(2H-苯并三唑-2-基)-6-(1-甲基-1-苯基乙基)-4-(1,1,3,3-四甲基丁基)苯酚(商品名「TINUVIN 928」，BASF製造)、3-(3-(2H-苯并三唑-2-基)-5-第三丁基-4-羥基苯基)丙酸甲酯與聚乙二醇300之反應產物(商品名「TINUVIN 1130」，BASF公司製造)、2-(2H-苯并三唑-2-基)-對甲酚(商品名「TINUVIN P」，BASF公司製造)、2(2H-苯并三唑-2-基)-4,6-雙(1-甲基-1-苯基乙基)苯酚(商品名「TINUVIN 234」，BASF公司製造)、2-[5-氯-2H-苯并三唑-2-基]-4-甲基-6-(第三丁基)苯酚(商品名「TINUVIN 326」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4,6-二-第三戊基苯酚(商品名「TINUVIN 328」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4-(1,1,3,3-四甲基丁基)苯酚(商品名「TINUVIN 329」，BASF公司製造)、2,2'-亞甲基雙[6-(2H-苯并三唑-2-基)-4-(1,1,3,3-四甲基丁基)苯酚](商品名「TINUVIN 360」，BASF公司製造)、2-(2H-苯并三唑-2-基)-6-十二烷基-4-甲基苯酚(商品名「TINUVIN 571」，BASF公司製造)、2-[2-羥基-3-(3,4,5,6-四氫鄰苯二甲醯亞胺-甲基)-5-甲基苯基]苯并三唑(商品名「Sumisorb 250」，住友化學股份有限公司製造)、及2,2'-亞甲基雙[6-(2H-苯并三唑-2-基)-4-第三辛基苯酚](商品名「Adekastab LA-31」，ADEKA股份有限公司製造)。 作為羥基苯基三系紫外線吸收劑，例如可列舉：2-(4,6-雙(2,4-二甲基苯基)-1,3,5-三-2-基)-5-羥基苯基與[(碳數10～16之烷氧基)甲基]氧雜環丙烷之反應產物(商品名「TINUVIN 400」，BASF公司製造)、2-[4,6-雙(2,4-二甲基苯基)-1,3,5-三-2-基]-5-[3-(十二烷氧基)-2-羥基丙氧基]苯酚)、2-(2,4-二羥基苯基)-4,6-雙-(2,4-二甲基苯基)-1,3,5-三與(2-乙基己基)-縮水甘油酸酯之反應產物(商品名「TINUVIN 405」，BASF公司製造)、2,4-雙(2-羥基-4-丁氧基苯基)-6-(2,4-二丁氧基苯基)-1,3,5-三(商品名「TINUVIN 460」，BASF公司製造)、2-(4,6-二苯基-1,3,5-三-2-基)-5-[(己基)氧基]-苯酚(商品名「TINUVIN 1577」，BASF公司製造)、2-(4,6-二苯基-1,3,5-三-2-基)-5-[2-(2-乙基己醯氧基)乙氧基]-苯酚(商品名「Adekastab LA-46」，ADEKA股份有限公司製造)、及2-(2-羥基-4-[1-辛氧基羰基乙氧基]苯基)-4,6-雙(4-苯基苯基)-1,3,5-三(商品名「TINUVIN 479」，BASF公司製造)。 作為水楊酸酯系紫外線吸收劑，例如可列舉：2-丙烯醯氧基苯甲酸苯酯、2-丙烯醯氧基-3-甲基苯甲酸苯酯、2-丙烯醯氧基-4-甲基苯甲酸苯酯、2-丙烯醯氧基-5-甲基苯甲酸苯酯、2-丙烯醯氧基-3-甲氧基苯甲酸苯酯、2-羥基苯甲酸苯酯、2-羥基-3-甲基苯甲酸苯酯、2-羥基-4-甲基苯甲酸苯酯、2-羥基-5-甲基苯甲酸苯酯、2-羥基-3-甲氧基苯甲酸苯酯、及2,4-二-第三丁基苯基3,5-二-第三丁基-4-羥基苯甲酸酯(商品名「TINUVIN 120」，BASF公司製造)。 作為二苯甲酮系紫外線吸收劑或氧基二苯甲酮系紫外線吸收劑，例如可列舉：2,4-二羥基二苯甲酮、2-羥基-4-甲氧基二苯甲酮、2-羥基-4-甲氧基二苯甲酮-5-磺酸、2-羥基-4-辛氧基二苯甲酮、4-十二烷氧基-2-羥基二苯甲酮、4-苄氧基-2-羥基二苯甲酮、2,2'-二羥基-4-甲氧基二苯甲酮(商品名「KEMISORB 111」，Chemipro Kasei股份有限公司製造)、2,2',4,4'-四羥基二苯甲酮(商品名「SEESORB 106」，Shipro Kasei股份有限公司製造)、及2,2'-二羥基-4,4'-二甲氧基二苯甲酮。 作為氰基丙烯酸酯系紫外線吸收劑，例如可列舉：2-氰基丙烯酸烷基酯、2-氰基丙烯酸環烷基酯、2-氰基丙烯酸烷氧基烷基酯、2-氰基丙烯酸烯基酯、及2-氰基丙烯酸炔基酯。 關於黏著劑層11及/或黏著劑層12所含有之紫外線吸收劑，就具有較高之紫外線吸收性並且具有較高之光穩定性之觀點、或容易獲得透明性較高之黏著劑層之觀點而言，較佳為選自由苯并三唑系紫外線吸收劑、羥基苯基三系紫外線吸收劑、及二苯甲酮系紫外線吸收劑所組成之群中之至少一種。黏著劑層11及/或黏著劑層12所含有之紫外線吸收劑更佳為具有碳數6以上之烴基及羥基作為取代基之苯基鍵結於構成苯并三唑環之氮原子的苯并三唑系紫外線吸收劑。 於黏著劑層11及/或黏著劑層12含有紫外線吸收劑之情形時，關於黏著劑層中之紫外線吸收劑之含量，就控制黏著劑層之波長350 nm之光之透過率而實現較高之紫外線吸收性的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為0.01重量份以上，更佳為0.05重量份以上，更佳為0.1重量份以上。又，關於黏著劑層中之紫外線吸收劑之含量，就於黏著劑層中抑制伴隨著紫外線吸收劑之添加的黏著劑之黃化現象的產生而實現優異之光學特性或較高之透明性的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為10重量份以下，更佳為9重量份以下，更佳為8重量份以下。 黏著劑層11、12亦可分別含有光穩定劑。於黏著劑層11、12分別含有光穩定劑之情形時，較佳為一併含有紫外線吸收劑。光穩定劑係可捕捉因紫外線等光之照射而可能生成之自由基的化學種。作為光穩定劑，例如可列舉：酚系光穩定劑、磷系光穩定劑、硫醚系光穩定劑、及受阻胺系穩定劑等胺系光穩定劑。黏著劑層11及/或黏著劑層12可含有一種光穩定劑，亦可含有兩種以上之光穩定劑。 作為酚系光穩定劑，例如可列舉：2,6-二-第三丁基-4-甲基苯酚、4-羥基甲基-2,6-二-第三丁基苯酚、2,6-二-第三丁基-4-乙基苯酚、丁基化羥基苯甲醚、3-(4-羥基-3,5-二-第三丁基苯基)丙酸正十八烷基酯、(4-羥基-3-甲基-5-第三丁基)苄基丙二酸二硬脂酯、生育酚、2,2'-亞甲基雙(4-甲基-6-第三丁基苯酚)、2,2'-亞甲基雙(4-乙基-6-第三丁基苯酚)、4,4'-亞甲基雙(2,6-二-第三丁基苯酚)、4,4'-亞丁基雙(6-第三丁基-間甲酚)、4,4'-硫代雙(6-第三丁基-間甲酚)、苯乙烯化苯酚、N,N'-六亞甲基雙(3,5-二-第三丁基-4-羥基氫化肉桂醯胺)、雙(3,5-二-第三丁基-4-羥基苄基膦酸乙酯)鈣、1,1,3-三(2-甲基-4-羥基-5-第三丁基苯基)丁烷、1,3,5-三甲基-2,4,6-三(3,5-二-第三丁基-4-羥基苄基)苯、四[3-(3,5-二-第三丁基-4-羥基苯基)丙醯氧基甲基]甲烷、1,6-己二醇-雙[3-(3,5-二-第三丁基-4-羥基苯基)丙酸酯]、2,2'-亞甲基雙(4-甲基-6-環己基苯酚)、2,2'-亞甲基雙[6-(1-甲基環己基)-對甲酚]、1,3,5-三(4-第三丁基-3-羥基-2,6-二甲基苄基)異三聚氰酸、1,3,5-三(3,5-二-第三丁基-4-羥基苄基)異三聚氰酸、三乙二醇-雙[3-(3-第三丁基-4-羥基-5-甲基苯基)丙酸酯]、2,2'-草醯胺雙[乙基3-(3,5-二-第三丁基-4-羥基苯基)丙酸酯]、6-(4-羥基-3,5-二-第三丁基苯胺基)-2,4-二辛基硫基-1,3,5-三、對苯二甲酸雙[2-第三丁基-4-甲基-6-(2-羥基-3-第三丁基-5-甲基苄基)苯基]酯、3,9-雙{2-[3-(3-第三丁基-4-羥基-5-甲基苯基)丙醯氧基]-1,1-二甲基乙基}-2,4,8,10-四氧雜螺[5.5]十一烷、及3,9-雙{2-[3-(3,5-二-第三丁基-4-羥基苯基)丙醯氧基]-1,1-二甲基乙基}-2,4,8,10-四氧雜螺[5.5]十一烷。 作為磷系光穩定劑，例如可列舉：亞磷酸三(壬基苯基)酯、亞磷酸三(2,4-二-第三丁基苯基)酯、亞磷酸三[2-第三丁基-4-(3-第三丁基-4-羥基-5-甲基苯基硫基)-5-甲基苯基]酯、亞磷酸三癸酯、亞磷酸辛基二苯酯、亞磷酸二(癸基)單苯酯、二(十三烷基)季戊四醇二亞磷酸酯、二硬脂基季戊四醇二亞磷酸酯、二(壬基苯基)季戊四醇二亞磷酸酯、雙(2,4-二-第三丁基苯基)季戊四醇二亞磷酸酯、雙(2,6-二-第三丁基-4-甲基苯基)季戊四醇二亞磷酸酯、雙(2,4,6-三-第三丁基苯基)季戊四醇二亞磷酸酯、四(十三烷基)亞異丙基二苯酚二亞磷酸酯、四(十三烷基)-4,4'-亞正丁基雙(2-第三丁基-5-甲基苯酚)二亞磷酸酯、六(十三烷基)-1,1,3-三(2-甲基-4-羥基-5-第三丁基苯基)丁烷三亞磷酸酯、四(2,4-二-第三丁基苯基)伸聯苯基二亞膦酸二酯、9,10-二氫-9-氧雜-10-磷雜菲-10-氧化物、及三(2-[(2,4,8,10-四-第三丁基二苯并[d,f][1,3,2]二氧雜磷雜環庚烯-6-基)氧基]乙基)胺。 作為硫醚系光穩定劑，例如可列舉：硫代二丙酸二月桂酯、硫代二丙酸二肉豆蔻酯、及硫代二丙酸二硬脂酯等硫代二丙酸二烷基酯化合物，以及四[亞甲基(3-十二烷基硫基)丙酸酯]甲烷等多元醇之β-烷基巰基丙酸酯化合物。 作為胺系光穩定劑，例如可列舉：丁二酸二甲酯與4-羥基-2,2,6,6-四甲基-1-哌啶乙醇之聚合物(商品名「TINUVIN 622」，BASF公司製造)、該聚合物與N,N',N'',N'''-四-(4,6-雙-(丁基-(N-甲基-2,2,6,6-四甲基哌啶-4-基)胺基)-三-2-基)-4,7-二氮雜癸烷-1,10-二胺之一比一反應產物(商品名「TINUVIN 119」，BASF公司製造)、聚[{6-(1,1,3,3-四甲基丁基)胺基-1,3,5-三-2-4-二基}{2,2,6,6-四甲基-4-哌啶基}亞胺基]六亞甲基{(2,2,6,6-四甲基-4-哌啶基)亞胺基}(商品名「TINUVIN 944」，BASF公司製造)、癸二酸雙(2,2,6,6-四甲基-4-哌啶基)酯(商品名「TINUVIN 770」，BASF公司製造)、癸二酸雙(2,2,6,6-四甲基-1-(辛氧基)-4-哌啶基)酯與1,1-二甲基乙基氫過氧化物與辛烷之反應產物(商品名「TINUVIN 123」，BASF公司製造)、[[3,5-雙(1,1-二甲基乙基)-4-羥基苯基]甲基]丁基丙二酸雙(1,2,2,6,6-五甲基-4-哌啶基)酯(商品名「TINUVIN 144」，BASF公司製造)、環己烷及過氧化N-丁基2,2,6,6-四甲基-4-哌啶胺-2,4,6-三氯-1,3,5-三之反應產物與2-胺基乙醇之反應產物(商品名「TINUVIN 152」，BASF公司製造)、癸二酸雙(1,2,2,6,6-五甲基-4-哌啶基)酯及癸二酸甲基1,2,2,6,6-五甲基-4-哌啶酯之混合物(商品名「TINUVIN 292」，BASF公司製造)、以及1,2,3,4-丁烷四羧酸與1,2,2,6,6-五甲基-4-哌啶醇及3,9-雙(2-羥基-1,1-二甲基乙基)-2,4,8,10-四氧雜螺[5.5]十一烷之混合酯化物(商品名「Adekastab LA-63P」，ADEKA股份有限公司製造)。作為胺系穩定劑，尤佳為受阻胺系穩定劑。 於黏著劑層11及/或黏著劑層12含有光穩定劑之情形時，關於黏著劑層中之光穩定劑之含量，就使黏著劑層實現充分之耐光性之觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為0.1重量份以上，更佳為0.2重量份以上。又，關於黏著劑層中之光穩定劑之含量，就於黏著劑層中抑制由光穩定劑引起之著色而實現較高之透明性之觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為5重量份以下，更佳為3重量份以下。 黏著劑層11及/或黏著劑層12所含有之黏著劑或丙烯酸系聚合物亦可利用並非上述共聚合性交聯劑之交聯劑進行交聯。可應用由該交聯劑所致之黏著劑或丙烯酸系聚合物之交聯，而調整黏著劑層11及/或黏著劑層12之凝膠分率。作為此種交聯劑，例如可列舉：異氰酸酯系交聯劑、環氧系交聯劑、三聚氰胺系交聯劑、過氧化物系交聯劑、脲系交聯劑、金屬烷氧化物系交聯劑、金屬螯合物系交聯劑、金屬鹽系交聯劑、碳二醯亞胺系交聯劑、㗁唑啉系交聯劑、氮丙啶系交聯劑、及胺系交聯劑。黏著劑層11及/或黏著劑層12可含有一種該交聯劑，亦可含有兩種以上之該交聯劑。於本實施形態中，較佳為使用異氰酸酯系交聯劑及/或環氧系交聯劑。 作為異氰酸酯系交聯劑，例如可列舉：低級脂肪族聚異氰酸酯類、脂環式聚異氰酸酯類、及芳香族聚異氰酸酯類。作為低級脂肪族聚異氰酸酯類，例如可列舉：1,2-伸乙基二異氰酸酯、1,4-伸丁基二異氰酸酯、及1,6-六亞甲基二異氰酸酯。作為脂環式聚異氰酸酯類，例如可列舉：伸環戊基二異氰酸酯、伸環己基二異氰酸酯、異佛爾酮二異氰酸酯、氫化甲苯二異氰酸酯、及氫化二甲苯二異氰酸酯。作為芳香族聚異氰酸酯類，例如可列舉：2,4-甲苯二異氰酸酯、2,6-甲苯二異氰酸酯、4,4'-二苯基甲烷二異氰酸酯、及苯二甲基二異氰酸酯。又，作為異氰酸酯系交聯劑，亦可列舉：三羥甲基丙烷/甲苯二異氰酸酯加成物(商品名「Coronate L」，Nippon Polyurethane Industry股份有限公司製造)、三羥甲基丙烷/六亞甲基二異氰酸酯加成物(商品名「Coronate HL」，Nippon Polyurethane Industry股份有限公司製造)、三羥甲基丙烷/苯二甲基二異氰酸酯加成物(商品名「Takenate D-110N」，三井化學股份有限公司製造)等市售品。 作為環氧系交聯劑(多官能環氧化合物)，例如可列舉：N,N,N',N'-四縮水甘油基-間苯二甲胺、二縮水甘油基苯胺、1,3-雙(N,N-二縮水甘油基胺基甲基)環己烷、1,6-己二醇二縮水甘油醚、新戊二醇二縮水甘油醚、乙二醇二縮水甘油醚、丙二醇二縮水甘油醚、聚乙二醇二縮水甘油醚、聚丙二醇二縮水甘油醚、山梨糖醇聚縮水甘油醚、甘油聚縮水甘油醚、季戊四醇聚縮水甘油醚、聚甘油聚縮水甘油醚、山梨糖醇酐聚縮水甘油醚、三羥甲基丙烷聚縮水甘油醚、己二酸二縮水甘油酯、鄰苯二甲酸二縮水甘油酯、三(2-羥基乙基)異三聚氰酸三縮水甘油酯、間苯二酚二縮水甘油醚、及雙酚-S-二縮水甘油醚。又，作為環氧系交聯劑，亦可列舉具有兩個以上之環氧基之環氧系樹脂。此外，作為環氧系交聯劑，亦可列舉商品名「Tetrad C」(三菱瓦斯化學股份有限公司製造)等市售品。 於黏著劑層11及/或黏著劑層12含有用以將丙烯酸系聚合物間交聯的以上般之交聯劑之情形時，關於黏著劑層中之該交聯劑之含量，就使黏著劑層實現對被接著體之充分之接著可靠性的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為0.001重量份以上，更佳為0.01重量份以上。又，關於黏著劑層中之該交聯劑之含量，就使黏著劑層表現出適度之柔軟性而實現良好之黏著力的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為10重量份以下，更佳為5重量份以下。 黏著劑層11、12亦可分別視需要進而含有交聯促進劑、增黏樹脂、抗老化劑、填充劑、顏料或染料等著色劑、抗氧化劑、鏈轉移劑、塑化劑、軟化劑、界面活性劑、及抗靜電劑等添加劑。作為增黏樹脂，例如可列舉：松香衍生物、聚萜烯樹脂、石油樹脂、及油溶性苯酚。 關於黏著劑層11之厚度，就使黏著帶X實現對黏著劑層11側之被接著體的充分之黏著力的觀點而言，較佳為5 μm以上，更佳為10 μm以上，更佳為15 μm以上。又，就形成之容易度之觀點而言，黏著劑層11之厚度較佳為1000 μm以下，更佳為900 μm以下，更佳為800 μm以下。 關於黏著劑層12之厚度，就使黏著帶X實現對黏著劑層12側之被接著體的充分之黏著力的觀點而言，較佳為5 μm以上，更佳為10 μm以上，更佳為15 μm以上。又，就形成之容易度之觀點而言，黏著劑層11之厚度較佳為1000 μm以下，更佳為900 μm以下，更佳為800 μm以下。 對於具有包含以上般之基材10及黏著劑層11、12之積層構造的黏著帶X而言，基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上。關於黏著帶X之基材寬度方向之艾勉道夫撕裂強度，較佳為0.45 N以下，更佳為0.4 N以下，更佳為0.3 N以下。關於黏著帶X之基材機械方向之艾勉道夫撕裂強度，較佳為1.1 N以上，更佳為1.3 N以上，更佳為1.5 N以上。艾勉道夫撕裂強度係設為依據JIS K 7128-2而測得之值。 又，光學用黏著帶X之厚度方向之霧度較佳為3%以下，更佳為2.5%以下，更佳為2%以下，更佳為1.5%以下，更佳為1%以下。霧度係設為依據JIS K 7136而測得之值。關於黏著帶X，可見光波長範圍內之全光線透過率例如為85%以上。全光線透過率係設為依據JIS K 7361-1而測得之值。 黏著帶X亦可以將黏著劑層11之黏著面11a被覆之方式設有剝離襯墊(隔離膜)。黏著帶X亦可以將黏著劑層12之黏著面12a被覆之方式設有剝離襯墊(隔離膜)。剝離襯墊係用以進行保護以使黏著帶X之黏著劑層11、12不露出之要素，且係於將黏著帶X貼合於被接著體時自黏著帶X剝離。作為剝離襯墊，例如可列舉：具有剝離處理層之基材、包含氟聚合物之低接著性基材、及包含無極性聚合物之低接著性基材。剝離襯墊之表面亦可實施脫模處理、防污處理、或抗靜電處理。剝離襯墊之厚度例如為5～200 μm。黏著帶X具體而言，可採取帶有將黏著劑層11、12之黏著面11a、12a被覆的剝離襯墊之片材狀形態，亦可採取以將黏著帶X與剝離襯墊交替配置之方式帶有剝離襯墊並經捲繞成捲狀之形態。 以上般之構成之黏著帶X例如可藉由分別形成黏著劑層11、12後，分別對基材10貼合黏著劑層11、12而製造。黏著劑層11例如可藉由以下方式形成：於特定之剝離襯墊上塗佈黏著劑層11形成用之黏著劑組合物而形成黏著劑組合物層，於該黏著劑組合物層上進而積層剝離襯墊，使黏著劑組合物於該剝離襯墊間硬化。另一方面，黏著劑層12例如可藉由以下方式形成：於特定之剝離襯墊上塗佈黏著劑層12形成用之黏著劑組合物而形成黏著劑組合物層，於該黏著劑組合物層上進而積層剝離襯墊，使黏著劑組合物於該剝離襯墊間硬化。 作為黏著劑層11形成用之黏著劑組合物及/或黏著劑層12形成用之黏著劑組合物，例如可使用可藉由活性能量線之照射進行聚合反應而硬化之黏著劑組合物。即，黏著劑層11及/或黏著劑層12例如為活性能量線硬化型黏著劑組合物之硬化物。丙烯酸系黏著劑層形成用之活性能量線硬化型黏著劑組合物至少含有用以形成丙烯酸系聚合物之單體、低聚物、及光聚合起始劑。該組合物中之單體及低聚物可以用以形成丙烯酸系聚合物的特定組成之單體混合物之所謂部分聚合物的形式提供。又，該黏著劑組合物亦可含有視需要而採用之其他成分作為所形成之黏著劑層的成分。作為照射至活性能量線硬化型黏著劑組合物以使黏著劑層硬化的活性能量線，例如可列舉：紫外線、α射線、β射線、γ射線、中子束、及電子束，較佳為採用紫外線。對於受到活性能量線之照射的丙烯酸系黏著劑層形成用之活性能量線硬化型黏著劑組合物而言，經由光聚合起始劑之活化而產生起始反應，進行聚合反應以形成丙烯酸系聚合物。若採用紫外線照射等活性能量線照射作為黏著劑層形成用之硬化性黏著劑組合物之硬化方法，則即便於該黏著劑組合物之塗膜相對較厚之情形時，亦容易獲得經適當硬化之黏著劑層。因此，黏著劑層11為活性能量線硬化型黏著劑組合物之硬化物之構成對於實現即便相對較厚亦經充分硬化之黏著劑層11的方面而言係較佳。黏著劑層12為活性能量線硬化型黏著劑組合物之硬化物之構成對於實現即便相對較厚亦經充分硬化之黏著劑層12的方面而言係較佳。 作為上述光聚合起始劑，例如可列舉：安息香醚系光聚合起始劑、苯乙酮系光聚合起始劑、α-酮醇系光聚合起始劑、芳香族磺醯氯系光聚合起始劑、光活性肟系光聚合起始劑、安息香系光聚合起始劑、苯偶醯系光聚合起始劑、二苯甲酮系光聚合起始劑、縮酮系光聚合起始劑、及9-氧硫 系光聚合起始劑。作為安息香醚系光聚合起始劑，例如可列舉：安息香甲醚、安息香乙醚、安息香丙醚、安息香異丙醚、安息香異丁醚、及2,2-二甲氧基-1,2-二苯基乙烷-1-酮。作為苯乙酮系光聚合起始劑，例如可列舉：2,2-二乙氧基苯乙酮、2,2-二甲氧基-2-苯基苯乙酮、1-羥基環己基苯基酮(α-羥基環己基苯基酮)、4-苯氧基二氯苯乙酮、及4-(第三丁基)二氯苯乙酮。作為α-酮醇系光聚合起始劑，例如可列舉2-甲基-2-羥基苯丙酮、及1-[4-(2-羥基乙基)苯基]-2-甲基丙烷-1-酮。作為芳香族磺醯氯系光聚合起始劑，例如可列舉2-萘磺醯氯。作為光活性肟系光聚合起始劑，例如可列舉1-苯基-1,2-丙烷二酮-2-(O-乙氧羰基)-肟。作為安息香系光聚合起始劑，例如可列舉安息香。作為苯偶醯系光聚合起始劑，例如可列舉苯偶醯。作為二苯甲酮系光聚合起始劑，例如可列舉二苯甲酮、苯甲醯基苯甲酸、3,3'-二甲基-4-甲氧基二苯甲酮、及聚乙烯基二苯甲酮。作為縮酮系光聚合起始劑，例如可列舉苯偶醯二甲基縮酮。作為9-氧硫系光聚合起始劑，例如可列舉：9-氧硫、2-氯9-氧硫、2-甲基9-氧硫 、2,4-二甲基9-氧硫 、異丙基9-氧硫 、2,4-二異丙基9-氧硫 、及十二烷基9-氧硫 。活性能量線硬化型黏著劑組合物中之光聚合起始劑之含量例如為0.01～3重量%。 作為黏著劑層11形成用之黏著劑組合物及/或黏著劑層12形成用之黏著劑組合物，亦可使用已含有作為黏著劑之丙烯酸系聚合物並藉由例如加熱乾燥而可進行硬化之溶劑型黏著劑組合物或乳液型黏著劑組合物。該組合物亦可含有視需要而採用之其他成分作為所形成之黏著劑層之成分。該黏著劑組合物中之丙烯酸系聚合物可使丙烯酸系聚合物形成用之原料單體成分進行聚合而獲得。作為聚合方法，例如可列舉：溶液聚合、乳化聚合、及塊狀聚合。於進行溶液聚合時，可使用例如芳香族烴類、脂肪族烴類、脂環式烴類、酯類、及酮類作為溶劑。作為芳香族烴類之溶劑，例如可列舉甲苯及苯。作為脂肪族烴類之溶劑，例如可列舉正己烷及正庚烷。作為脂環式烴類之溶劑，例如可列舉環己烷及甲基環己烷。作為酯類之溶劑，例如可列舉乙酸乙酯及乙酸正丁酯。作為酮類之溶劑，例如可列舉甲基乙基酮及甲基異丁基酮。於溶液聚合中，可使用一種溶劑，亦可使用兩種以上之溶劑。 於為了獲得丙烯酸系聚合物而使原料單體成分進行聚合時，可使用聚合起始劑。視聚合反應之種類不同，可使用例如光聚合起始劑或熱聚合起始劑。於聚合時，可使用一種聚合起始劑，亦可使用兩種以上之聚合起始劑。 作為光聚合起始劑，例如可列舉：上述安息香醚系光聚合起始劑、苯乙酮系光聚合起始劑、α-酮醇系光聚合起始劑、芳香族磺醯氯系光聚合起始劑、光活性肟系光聚合起始劑、安息香系光聚合起始劑、苯偶醯系光聚合起始劑、二苯甲酮系光聚合起始劑、縮酮系光聚合起始劑、及9-氧硫 系光聚合起始劑。關於光聚合起始劑之使用量，例如相對於單體成分總量(100重量份)而為0.01～3重量份。 作為熱聚合起始劑，例如可列舉：偶氮系聚合起始劑、過氧化物系聚合起始劑、及氧化還原系聚合起始劑。作為偶氮系聚合起始劑，例如可列舉：2,2'-偶氮雙異丁腈、2,2'-偶氮雙-2-甲基丁腈、2,2'-偶氮雙(2-甲基丙酸)二甲酯、及4,4'-偶氮雙-4-氰基戊酸。作為過氧化物系聚合起始劑，例如可列舉過氧化苯甲醯及過氧化順丁烯二酸第三丁酯。關於熱聚合起始劑之使用量，例如相對於單體成分總量(100重量份)而為0.05～0.3重量份。 於用以獲得上述丙烯酸系聚合物之聚合時，為了調整丙烯酸系聚合物之分子量，可使用鏈轉移劑。作為鏈轉移劑，例如可列舉：α-硫甘油、2-巰基乙醇、2,3-二巰基-1-丙醇、辛硫醇、第三壬基硫醇、十二硫醇(月桂硫醇)、第三-十二硫醇、縮水甘油基硫醇、巰基乙酸、巰基乙酸甲酯、巰基乙酸乙酯、巰基乙酸丙酯、巰基乙酸丁酯、巰基乙酸第三丁酯、巰基乙酸2-乙基己酯、巰基乙酸辛酯、巰基乙酸異辛酯、巰基乙酸癸酯、及巰基乙酸十二烷基酯。作為鏈轉移劑，可使用一種鏈轉移劑，亦可使用兩種以上之鏈轉移劑。於本實施形態中，作為鏈轉移劑，較佳為使用α-硫甘油。關於鏈轉移劑之使用量，例如相對於用以獲得丙烯酸系聚合物之單體成分總量(100重量份)而為0.01～0.5重量份。 於活性能量線硬化型黏著劑組合物、或溶劑型黏著劑組合物、乳液型黏著劑組合物等黏著劑層形成用之黏著劑組合物包含上述丙烯酸系低聚物的情形時，該低聚物可使特定組成之原料單體成分進行聚合而獲得。作為聚合方法，例如可列舉：溶液聚合、乳化聚合、及塊狀聚合。作為用以進行溶液聚合之溶劑，可列舉上文中作為可用於用以獲得丙烯酸系聚合物之溶液聚合之溶劑而描述者。於該溶液聚合中，可使用一種溶劑，亦可使用兩種以上之溶劑。又，於為了獲得上述低聚物而使原料單體成分進行聚合時，可使用聚合起始劑。作為該聚合起始劑，可列舉上文中作為可用於用以獲得丙烯酸系聚合物之聚合之聚合起始劑而描述的光聚合起始劑或熱聚合起始劑。於聚合時，可使用一種聚合起始劑，亦可使用兩種以上之聚合起始劑。 例如以上述方式製造之黏著帶X所具有之基材10如上述般為聚酯系基材。此種構成係對於使雙面黏著帶基材甚至黏著帶X享有耐熱性、或透明性、尺寸穩定性等聚酯系基材容易表現出之各種特性而言較佳。 又，黏著帶X所具有之基材10如上述般為寬度方向單軸延伸聚酯系基材。該基材10之厚度如上述般為75 μm以上，較佳為80 μm以上。該基材10之厚度如上述般較佳為150 μm以下，更佳為125 μm以下。雙面黏著帶之艾勉道夫撕裂強度等撕裂強度受到基材之機械特性之強烈支配之情況下，該等構成係適於使黏著帶X實現基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上的上述構成。 此外，黏著帶X之基材寬度方向之艾勉道夫撕裂強度如上述般為0.5 N以下，較佳為0.45 N以下，更佳為0.4 N以下，更佳為0.3 N以下。並且，黏著帶X之基材機械方向之艾勉道夫撕裂強度如上述般為1 N以上，較佳為1.1 N以上，更佳為1.3 N以上，更佳為1.5 N以上。該等構成係適於使黏著帶X實現艾勉道夫撕裂強度相對顯著地低至0.5 N以下的基材寬度方向上之良好手撕性。而且，艾勉道夫撕裂強度於基材機械方向上為基材寬度方向之2倍以上的構成係對於使黏著帶X提高基材寬度方向上之撕裂之指向性而言較佳。因此，該構成係對於以下情況而言較佳：於處於將黏著帶X貼合於被接著體之狀態下之情形時，使剝離力作用於黏著帶X之基材機械方向，在不撕裂該黏著帶X之情況下使其自被接著體適當地剝離。具體而言係對於以下情況而言較佳：於將黏著帶X貼合於被接著體後暫且剝離並再次進行貼合之作業(二次加工作業)時，使剝離力作用於黏著帶X之基材機械方向，在不撕裂該黏著帶X之情況下使其自被接著體適當地剝離。除基材寬度方向以外於基材機械方向上亦容易被撕裂之光學用雙面黏著帶存在以下傾向：於二次加工作業中之剝離時容易破裂，難以適當地剝離。產生了破裂之光學用雙面黏著帶無法用於再次之貼合。相對於此，黏著帶X具有與適於實現基材寬度方向上之良好手撕性的基材寬度方向艾勉道夫撕裂強度相比充分大之基材機械方向艾勉道夫撕裂強度，因此適於在二次加工作業時，使剝離力作用於基材機械方向，在不撕裂之情況下適當地剝離。 如上所述，黏著帶X係適於一面具有聚酯系基材一面一併實現良好之手撕性與較高之二次加工性。 黏著帶X之基材10之面內相位差如上述般較佳為1500 nm以上，更佳為3000 nm以上，更佳為6000 nm以上。此種構成係對於以下情況而言較佳：於在液晶顯示裝置中以填充形成顯示畫面之最前面之透明罩與裝置內之液晶面板之間的方式設有黏著帶X之情形時，例如抑制經由偏光太陽眼鏡等帶偏光功能之透鏡視認該顯示畫面時產生所謂消隱現象。又，存在以下傾向：基材10之面內相位差越大，於液晶顯示裝置中以填充透明罩與液晶面板之間的方式設有黏著帶X之情形時，例如於經由偏光太陽眼鏡等帶偏光功能之透鏡視認該顯示畫面時所謂顏色不均現象越得到抑制。 [實施例] 以下，根據實施例對本發明更詳細地進行說明，但本發明並不限定於該等實施例。 [丙烯酸系低聚物之製造例] 於反應容器內，將包含甲基丙烯酸二環戊酯(DCPMA)60重量份、甲基丙烯酸甲酯(MMA)40重量份、作為鏈轉移劑之α-硫甘油3.5重量份、及作為聚合溶劑之甲苯100重量份之混合物於70℃下、於氮氣氛圍下攪拌1小時。繼而，將作為聚合起始劑之2,2'-偶氮雙異丁腈0.2重量份添加至反應容器內之混合物中而製備反應溶液，於70℃下進行2小時反應。繼而，於80℃下進行2小時反應。其後，將反應容器內之反應溶液置於130℃之溫度氛圍下，自該反應溶液中將甲苯、鏈轉移劑、及未反應單體乾燥去除。藉此，獲得固體狀之丙烯酸系低聚物。該丙烯酸系低聚物之重量平均分子量(Mw)為5.1×103 。 [丙烯酸系黏著劑組合物C1之製備例] 於含有丙烯酸2-乙基己酯(2EHA)78重量份、N-乙烯基-2-吡咯啶酮(NVP)18重量份、及丙烯酸2-羥基乙酯(HEA)4重量份之單體混合物中添加第1光聚合起始劑(商品名「Irgacure 651」，BASF公司製造)0.035重量份及第2光聚合起始劑(商品名「Irgacure 184」，BASF公司製造)0.035重量份後，對該混合物使用黏度測定裝置測定黏度，並且使用紫外線照射裝置照射紫外線直至該混合物之黏度成為約20 Pa・s為止。於黏度測定中，裝置之轉子旋轉速度係設為10 rpm，測定溫度係設為30℃。藉此，獲得混合物中之單體成分之一部分聚合所得之部分聚合物即預聚物組合物(含有未經聚合反應之單體成分)。然後，將該預聚物組合物100重量份、上述丙烯酸系低聚物11.8重量份、丙烯酸2-羥基乙酯(HEA)17.6重量份、1,6-己二醇二丙烯酸酯(HDDA)0.294重量份、及矽烷偶合劑(商品名「KBM-403」，信越化學工業股份有限公司製造)0.353重量份混合，獲得丙烯酸系黏著劑組合物(丙烯酸系黏著劑組合物C1)。 [丙烯酸系黏著劑組合物C2之製備例] 於安裝有環流冷凝器、氮氣導入管、攪拌機、及溫度計之燒瓶(反應容器)內，將包含丙烯酸正丁酯(BA)100重量份、丙烯酸(AA)5重量份、丙烯酸2-羥基乙酯(HEA)0.075重量份、作為聚合起始劑之過氧化苯甲醯(商品名「Nyper BW」，日本油脂股份有限公司製造)0.2重量份、及作為聚合溶劑之乙酸乙酯205重量份的混合物於氮氣氛圍下平穩地攪拌，並且於63℃下進行4小時反應。藉此，獲得以約35重量%之濃度含有丙烯酸系聚合物之溶液(丙烯酸系聚合物溶液)。然後，以丙烯酸系聚合物濃度成為29重量%之方式利用乙酸乙酯將丙烯酸系聚合物溶液稀釋後，於該丙烯酸系聚合物溶液中相對於丙烯酸系聚合物100重量份而添加0.6重量份之三羥甲基丙烷/甲苯二異氰酸酯加成物(商品名「Coronate L」，Nippon Polyurethane Industry股份有限公司製造)與0.075重量份之矽烷偶合劑(商品名「KBM-403」，信越化學工業股份有限公司製造)，於25℃下進行約1分鐘混合，獲得溶劑型之丙烯酸系黏著劑組合物(丙烯酸系黏著劑組合物C2)。 [實施例1] ＜第1黏著劑層之形成＞ 於聚對苯二甲酸乙二酯(PET)系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)上塗佈上述丙烯酸系黏著劑組合物C1，形成黏著劑組合物層。繼而，於該黏著劑組合物層上進而積層PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)，被覆該黏著劑組合物層而阻斷氧。如此，獲得具有[剝離襯墊/黏著劑組合物層/剝離襯墊]之積層構成之積層體(積層體L1')。繼而，對該積層體L1'使用黑光燈(東芝股份有限公司製造)自其一個剝離襯墊之側照射照度3 mW/cm2 之紫外線300秒鐘。藉此使積層體L1'之黏著劑組合物層硬化而製成黏著劑層(第1黏著劑層)，獲得具有[剝離襯墊/黏著劑層(第1黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L1)。積層體L1中之第1黏著劑層之厚度為100 μm。 ＜第2黏著劑層之形成＞ 於PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)上塗佈上述丙烯酸系黏著劑組合物C1，形成黏著劑組合物層。繼而，於該黏著劑組合物層上進而積層PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)，被覆該黏著劑組合物層而阻斷氧。如此，獲得具有[剝離襯墊/黏著劑組合物層/剝離襯墊]之積層構成之積層體(積層體L2')。繼而，對該積層體L2'使用黑光燈(東芝股份有限公司製造)自其一個剝離襯墊之側照射照度3 mW/cm2 之紫外線300秒鐘。藉此使積層體L2'之黏著劑組合物層硬化而製成黏著劑層(第2黏著劑層)，獲得具有[剝離襯墊/黏著劑層(第2黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L2)。積層體L2中之第2黏著劑層之厚度為500 μm。 ＜光學用雙面黏著帶之製作＞ 準備對厚度80 μm之聚對苯二甲酸乙二酯膜(商品名「COSMOSHINE SRF」，面內相位差8400，東洋紡股份有限公司製造)之兩面實施電暈處理所得之膜(膜F1 )，自上述積層體L1(剝離襯墊/第1黏著劑層/剝離襯墊)將一個剝離襯墊剝離後，經由藉由該剝離而露出之第1黏著劑層表面，將單側附帶剝離襯墊之第1黏著劑層貼合於膜F1 之一個面。藉此，獲得具有[剝離襯墊/第1黏著劑層/膜F1 ]之積層構成之積層體。繼而，自上述積層體L2(剝離襯墊/第2黏著劑層/剝離襯墊)剝離一個剝離襯墊後，經由藉由該剝離而露出之第2黏著劑層表面，將單側附帶剝離襯墊之第2黏著劑層貼合於上述膜F1 之另一面。如此，製作具有[剝離襯墊/第1黏著劑層(厚度100 μm)/作為基材之膜F1 (厚度80 μm)/第2黏著劑層(厚度500 μm)/剝離襯墊]之積層構成之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例1之光學用雙面黏著帶之厚度為680 μm。 [實施例2] 使用對厚度80 μm之聚對苯二甲酸乙二酯膜(將「COSMOSHINE SRF」之易接著處理層替換為硬塗層用途之易接著處理層而成之膜，面內相位差8400，東洋紡股份有限公司製造)之兩面實施電暈處理所得之膜(膜F2 )代替膜F1 作為光學用雙面黏著帶之基材，除此以外，以與實施例1相同之方式製作實施例2之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例2之光學用雙面黏著帶之厚度為680 μm。 [實施例3] 將第2黏著劑層之厚度設為100 μm而代替500 μm，除此以外，以與實施例1相同之方式製作實施例3之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例3之光學用雙面黏著帶的厚度為280 μm。 [實施例4] 將上述丙烯酸系黏著劑組合物C2塗佈於膜F1 之單面後，於130℃下加熱60秒鐘而進行乾燥及硬化，於膜F1 上形成厚度12 μm之黏著劑層(第1黏著劑層)。繼而，將PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)貼合於該黏著劑層之表面。藉此，獲得具有[剝離襯墊/黏著劑層(第1黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L3)。另一方面，將上述丙烯酸系黏著劑組合物C2塗佈於PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)之單面後，於130℃下加熱60秒鐘而進行乾燥及硬化，於該剝離襯墊上形成厚度12 μm之黏著劑層(第2黏著劑層)。然後，將上述積層體L3經由其膜F1 側表面而貼合於該黏著劑層之表面。如此，製作具有[剝離襯墊/第1黏著劑層(厚度12 μm)/作為基材之膜F1 (厚度80 μm)/第2黏著劑層(厚度12 μm)/剝離襯墊]之積層構成的實施例4之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例4之光學用雙面黏著帶的厚度為104 μm。 [比較例1] 使用對厚度75 μm之聚對苯二甲酸乙二酯膜(商品名「XD500P」，面內相位差3000，東麗股份有限公司製造)之兩面實施電暈處理所獲得之膜(膜F3 )代替膜F1 作為光學用雙面黏著帶之基材，且將第2黏著劑層之厚度設為100 μm而代替500 μm，除此以外，以與實施例1相同之方式製作比較例1之光學用雙面黏著帶。除剝離襯墊之厚度外的比較例1之光學用雙面黏著帶之厚度為275 μm。 [比較例2] 使用膜F3 代替膜F1 作為光學用雙面黏著帶之基材，除此以外，以與實施例4相同之方式製作比較例2之光學用雙面黏著帶。除剝離襯墊之厚度外的比較例2之光學用雙面黏著帶之厚度為104 μm。 ＜艾勉道夫撕裂強度＞ 針對自實施例及比較例之光學用雙面黏著帶切出之各樣品片(60 mm×75 mm)，使用艾勉道夫撕裂強度測定裝置(商品名「艾勉道夫撕裂度試驗機」，TESTER SANGYO股份有限公司製造)，分別測定帶基材之寬度方向(TD)之艾勉道夫撕裂強度(N)與帶基材之機械方向(MD)之艾勉道夫撕裂強度(N)。本測定係依據JIS K 7128-2而進行。於供於測定之樣品片中預先設有自其端部於測定方向(TD或MD)上延伸之長度20 mm之切口。於本測定中，測定對於以該切口進一步伸長之方式藉由裝置對樣品片賦予之撕裂負荷的抵抗力。又，本測定所使用之上述裝置之測量最大值為1 N。將本測定之結果示於表1中。 ＜手撕性＞ 針對實施例及比較例之各光學用雙面黏著帶，研究其基材寬度方向之手撕性。具體而言，針對兩剝離襯墊經剝離之光學用雙面黏著帶，嘗試其基材寬度方向上之利用手工作業之撕裂。於該手工作業檢查中，將可容易地撕裂之情形評價為手撕性良好(○)，將無法撕裂之情形評價為手撕性不良(×)。將其結果示於表1中。 ＜霧度＞ 針對實施例及比較例之各光學用雙面黏著帶，使用霧度計HM-150型(村上色彩技術研究所股份有限公司製造)依據JIS K 7136所規定之方法測定霧度(%)。本測定係對處於兩剝離襯墊經剝離且貼附於載玻片(商品名「載玻片S1112」，厚度1.0～1.2 mm，松波硝子工業股份有限公司製造)之狀態下的光學用黏著帶進行。將其結果示於表1中。 [評價] 具備本發明之構成之實施例1～4之光學用雙面黏著帶均實現了良好之手撕性。相對於此，比較例1、2之光學用雙面黏著帶均無法以手於基材寬度方向上撕裂，未實現良好之手撕性。 [表1] FIG. 1 is a partial cross-sectional view of an adhesive tape X of an optical double-sided adhesive tape as an embodiment of the present invention. The adhesive tape X has a laminated structure including a substrate 10 as a transparent substrate, an adhesive layer 11 as a first adhesive layer, and an adhesive layer 12 as a second adhesive layer. The adhesive tape X can be used, for example, in the manufacture of a display device such as a flat panel display. In the case where a display device such as a liquid crystal display or an input device such as a touch panel has a laminated structure including various substrates or films, in order to join adjacent specific parts in the laminated structure, or to fill the space between adjacent parts For gaps, adhesive tape X can be used. The base material 10 of the adhesive tape X is a part of the adhesive tape X which is located between the adhesive layers 11 and 12 and functions as a support. Substrate. The polyester-based substrate refers to a substrate such as a film or a sheet containing a polyester-based resin in a maximum weight ratio among the constituent materials. Examples of the constituent material of such a substrate 10 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polyethylene terephthalate-1,4 -Cyclohexane dimethyl ester. The so-called uniaxially stretched polyester-based substrate in the width direction of the substrate refers to the direction in which the raw resin material is extruded during the manufacturing process of the polyester-based substrate and the direction of travel of the extruded molded body such as a film, or Uniaxially stretched polyester-based substrate in the machine direction (MD) orthogonal to the width direction (TD). The stretching ratio in the width direction of the base material 10 which is such a uniaxially stretched polyester-based substrate in the width direction is preferably 2.5 times or more, and more preferably 3 times or more. The stretching ratio is preferably 6 times or less, and more preferably 5.5 times or less. The thickness of the substrate 10 is 75 μm or more, and preferably 80 μm or more. The thickness of the substrate 10 is preferably 150 μm or less, and more preferably 125 μm or less. The in-plane phase difference of the substrate 10 is preferably 1500 nm or more, more preferably 3000 nm or more, and even more preferably 6000 nm or more. In this embodiment, the in-plane phase difference of the substrate 10 refers to a plane parallel to the principal surface of the substrate 10 and related to the birefringence when light having a wavelength of 590 nm passes through the substrate 10 at 23 ° C. Generated between the polarizing component (abnormal light) vibrating in the direction of the retardation axis and the polarizing component (normal light) vibrating in the direction of the advancement axis of the two optical spindles (late phase axis and advanced phase axis) running straight inside Phase difference. The in-plane phase difference is that the refractive index (relatively large) of abnormal light is set to nx, the refractive index (relatively small) of normal light is set to ny, and the thickness of the substrate 10 is set to d (nm). In this case, the value is represented by (nx-ny) × d. The surface on the side of the adhesive layer 11 and the surface on the side of the adhesive layer 12 of the base material 10 may also be subjected to surface treatments to improve the adhesion with the adhesive layer. Examples of such surface treatment include physical treatments such as corona treatment and plasma treatment, and chemical treatments such as primer treatment. The adhesive layers 11 and 12 of the adhesive tape X each contain an adhesive as a main agent and have light transmittance. The so-called base agent refers to a component which contains the largest weight ratio among the contained components. The adhesive layer 11 and / or the adhesive layer 12 include, for example, a polymer selected from the group consisting of an acrylic polymer as an acrylic adhesive, a polyurethane as a urethane adhesive, a silicone adhesive, And at least one of the group consisting of a rubber-based adhesive. From the viewpoint of achieving both the degree of adhesion required for the adhesive layer of the double-sided adhesive tape for optics and high transparency, it is preferable to use acrylic as the adhesive in the adhesive layers 11 and 12. polymer. The adhesive layer 11 has an adhesive surface 11a capable of being attached to an adherend, and the adhesive layer 12 has an adhesive surface 12a capable of being attached to an adherend. When the adhesive layer 11 and / or the adhesive layer 12 contain an acrylic polymer as an acrylic adhesive, it is preferable that the acrylic polymer contains acrylic acid derived from a linear or branched alkyl group. The monomer unit of an alkyl ester and / or an alkyl methacrylate having a linear or branched alkyl group is used as the most monomer unit by weight ratio. Hereinafter, "(meth) acrylic acid" means "acrylic acid" and / or "methacrylic acid". The (meth) acrylic acid alkyl ester having a linear or branched alkyl group as a monomer unit for forming the acrylic polymer, that is, a monomer component for forming the acrylic polymer Examples of the alkyl (meth) acrylate having a linear or branched alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (methyl) (Isopropyl) acrylate, n-butyl (meth) acrylate, second butyl (meth) acrylate, isobutyl (meth) acrylate, third butyl (meth) acrylate, (meth) acrylic acid Amyl ester, isoamyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (formyl) (Isyl) isooctyl acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate Ester, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, (formyl) Base) cetyl acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, isostearyl (meth) acrylate, undecyl (meth) acrylate (Meth) acrylic acid alkyl esters having linear or branched alkyl groups having 1 to 20 carbon atoms, such as esters and eicosyl (meth) acrylate. As the (meth) acrylic acid alkyl ester used in the acrylic polymer, one kind of (meth) acrylic acid alkyl ester may be used, or two or more kinds of (meth) acrylic acid alkyl ester may be used. In this embodiment, as the (meth) acrylic acid alkyl ester used for an acrylic polymer, it is preferred to use a material selected from the group consisting of n-butyl acrylate, 2-ethylhexyl acrylate, and isostearyl acrylate. At least one of the group. The ratio of the monomer unit derived from the (meth) acrylic acid alkyl ester having a linear or branched alkyl group in the acrylic polymer is preferably 50% by weight or more, more preferably 60% by weight or more, It is more preferably 70% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more. That is, the ratio of the alkyl (meth) acrylate in the monomer component composition of the raw material for forming the acrylic polymer is preferably 50% by weight or more, more preferably 60% by weight or more, and even more preferably 70% by weight. % Or more, more preferably 80% by weight or more, more preferably 90% by weight or more. The acrylic polymer has a monomer unit structure derived from a monomer component composition having such an alkyl (meth) acrylate ratio. This constitution, which is related to the ratio of the alkyl (meth) acrylate having a linear or branched alkyl group, is preferable in that an adhesive layer formed by containing the acrylic polymer is appropriately used. It shows basic properties such as the adhesion of acrylic polymers as acrylic adhesives. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may include a monomer unit derived from an alicyclic monomer. The alicyclic monomer as a monomer unit for forming an acrylic polymer, that is, the alicyclic monomer included in the monomer component for forming the acrylic polymer, for example, (meth) acrylic acid Cycloalkyl esters, (meth) acrylates having a bicyclic hydrocarbon ring, and (meth) acrylates having a tricyclic or more hydrocarbon ring. Examples of the cycloalkyl (meth) acrylate include cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, and cyclooctyl (meth) acrylate. ester. Examples of the (meth) acrylic acid ester having a bicyclic hydrocarbon ring include (meth) acrylic acid esters and (meth) acrylic acid isopropyl esters. Examples of the (meth) acrylate having a hydrocarbon ring having three or more rings include dicyclopentyl (meth) acrylate, dicyclopentyloxyethyl (meth) acrylate, and tricyclic (meth) acrylate Amyl ester, 1-adamantyl (meth) acrylate, 2-methyl-2-adamantyl (meth) acrylate, and 2-ethyl-2-adamantyl (meth) acrylate. As the alicyclic monomer used in the acrylic polymer, one kind of alicyclic monomer may be used, or two or more kinds of alicyclic monomers may be used. In the present embodiment, as the alicyclic monomer used in the acrylic polymer, it is preferable to use a member selected from cyclohexyl acrylate, cyclohexyl methacrylate, isopropyl acrylate, and isopropyl methacrylate. At least one of the group. As for the ratio of the monomer unit derived from an alicyclic monomer in the said acrylic polymer, it is preferable that it is 5 from a viewpoint of achieving moderate softness | flexibility in the adhesive layer which consists of this acrylic polymer. -60% by weight, more preferably 10-50% by weight. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may include a monomer unit derived from a hydroxyl-containing monomer. A hydroxyl-containing monosystem is a monomer having at least one hydroxyl group in a monomer unit. When the acrylic polymer in the adhesive layers 11 and 12 includes a hydroxyl-containing monomer unit, the adhesive layers 11 and 12 easily obtain adhesiveness or a moderate cohesive force. Examples of the hydroxyl group-containing monomer used to form the monomer unit of the acrylic polymer, that is, the hydroxyl group-containing monomer included in the monomer component used to form the acrylic polymer include, for example, hydroxyl group-containing ( (Meth) acrylates, vinyl alcohol, and allyl alcohol. Examples of the hydroxyl-containing (meth) acrylate include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and (methyl) Base) 4-hydroxybutyl acrylate, 6-hydroxyhexyl (meth) acrylate, hydroxyoctyl (meth) acrylate, hydroxydecyl (meth) acrylate, hydroxylauryl (meth) acrylate, and (formyl) (Methyl) (4-hydroxymethylcyclohexyl) acrylate. As the hydroxyl-containing monomer used in the acrylic polymer, one kind of hydroxyl-containing monomer may be used, and two or more kinds of hydroxyl-containing monomers may be used. In this embodiment, as the hydroxyl-containing monomer used in the acrylic polymer, it is preferred to use a monomer selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and At least one of the group consisting of 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, and 4-hydroxybutyl methacrylate. The ratio of monomer units derived from a hydroxyl-containing monomer in the acrylic polymer is preferably 1% by weight or more, more preferably 2% by weight or more, more preferably 3% by weight or more, and even more preferably 5% by weight. The above is more preferably 7% by weight or more, and even more preferably 10% by weight or more. The ratio of the monomer unit derived from the hydroxyl group-containing monomer in the acrylic polymer is preferably 20% by weight or less, and more preferably 18% by weight or less. These constitutions related to the ratio of the hydroxyl-containing monomer are preferable in that the adhesive layer formed by containing the acrylic polymer achieves adhesiveness or moderate cohesion. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may include a monomer unit derived from a monomer containing a nitrogen atom. A nitrogen atom-containing monosystem has a monomer having at least one nitrogen atom in a monomer unit. In the case where the acrylic polymer in the adhesive layers 11 and 12 includes a monomer unit containing a nitrogen atom, the adhesive layers 11 and 12 easily obtain hardness or good adhesion reliability. Examples of the nitrogen atom-containing monomer used to form the monomer unit of the acrylic polymer, that is, the nitrogen atom-containing monomer included in the monomer component used to form the acrylic polymer include, for example, N-ethylene Cyclic amidines and (meth) acrylamides. Examples of the N-vinyl cyclic amidine as a nitrogen atom-containing monomer include N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, and N-vinyl-3 -Linolinone, N-vinyl-2-caprolactam, N-vinyl-1,3-fluoren-2-one, and N-vinyl-3,5-linedione. Examples of the (meth) acrylamide as a nitrogen atom-containing monomer include (meth) acrylamide, N-ethyl (meth) acrylamide, and N-isopropyl (methyl) Acrylamide, N-n-butyl (meth) acrylamide, N-octyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-di Ethyl (meth) acrylamide, N, N-dipropyl (meth) acrylamide, and N, N-diisopropyl (meth) acrylamide. As the nitrogen atom-containing monomer used in the acrylic polymer, one type of nitrogen atom-containing monomer may be used, or two or more types of nitrogen atom-containing monomers may be used. In the present embodiment, as the nitrogen atom-containing monomer used in the acrylic polymer, N-vinyl-2-pyrrolidone is preferably used. Regarding the ratio of the monomer units derived from the nitrogen atom-containing monomer in the acrylic polymer, the viewpoint of achieving an appropriate hardness, adhesiveness, and transparency of the adhesive layer formed by the acrylic polymer is included. Specifically, it is preferably 1% by weight or more, more preferably 3% by weight or more, and even more preferably 5% by weight or more. In addition, regarding the ratio of the monomer units derived from a monomer containing a nitrogen atom in the acrylic polymer, the viewpoint of achieving sufficient transparency of the adhesive layer formed from the acrylic polymer or suppressing the change is suppressed. From the viewpoint of achieving excellent adhesion and achieving excellent bonding reliability, the weight is preferably 30% by weight or less, and more preferably 25% by weight or less. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may include a monomer unit derived from a carboxyl group-containing monomer. A carboxyl-containing monosystem is a monomer having at least one carboxyl group in a monomer unit. When the acrylic polymer in the adhesive layers 11 and 12 includes a carboxyl group-containing monomer unit, there are cases where the adhesive layers 11 and 12 can easily obtain good adhesion reliability. Examples of the carboxyl group-containing monomer used to form the monomer unit of the acrylic polymer, that is, the carboxyl group-containing monomer included in the monomer component used to form the acrylic polymer include (meth) Acrylic acid, methylene succinic acid, maleic acid, fumaric acid, butenoic acid, and methacrylic acid. As the carboxyl group-containing monomer used in the acrylic polymer, one kind of carboxyl group-containing monomer may be used, and two or more carboxyl group-containing monomers may be used. In this embodiment, acrylic acid is preferably used as the carboxyl group-containing monomer used in the acrylic polymer. Regarding the ratio of the monomer unit derived from a carboxyl group-containing monomer in the acrylic polymer, the adhesive layer formed by the acrylic polymer is obtained in the same manner as when a polar group is present on the surface of the adherend. From the viewpoint of ensuring good bonding reliability with the help of the interaction of the polar groups, it is preferably 0.1% by weight or more, and more preferably 0.5% by weight or more. Moreover, regarding the ratio of the monomer unit derived from a carboxyl group-containing monomer in the said acrylic polymer, the point which suppresses the adhesive layer formed by containing this acrylic polymer from becoming too hard and achieves good adhesion reliability is considered. Specifically, it is preferably 20% by weight or less, and more preferably 15% by weight or less. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may have a cross-linked structure derived from a polyfunctional (meth) acrylate which is a copolymerizable cross-linking agent. Examples of the polyfunctional (meth) acrylate include 1,6-hexanediol di (meth) acrylate, butanediol di (meth) acrylate, and (poly) ethylene glycol di (meth) ) Acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa ( (Meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tri (meth) acrylate, allyl (meth) acrylate, and vinyl (meth) acrylate. As the polyfunctional (meth) acrylate used for the acrylic polymer, one kind of polyfunctional (meth) acrylate may be used, or two or more kinds of polyfunctional (meth) acrylate may be used. In this embodiment, as the polyfunctional (meth) acrylate used in the acrylic polymer, it is preferable to use a member selected from the group consisting of 1,6-hexanediol diacrylate, dipentaerythritol hexaacrylate, and trimethylol. At least one of the group consisting of propane triacrylate. The ratio of the monomeric unit derived from a polyfunctional (meth) acrylate in the acrylic polymer is preferably 0.01% by weight or more, more preferably 0.03% by weight or more, and still more preferably 0.05% by weight or more. The ratio of the monomer unit derived from a polyfunctional (meth) acrylate in the acrylic polymer is preferably 1% by weight or less, and more preferably 0.5% by weight or less. These structures related to the ratio of the polyfunctional (meth) acrylate are preferable in that the adhesive layer formed by containing the acrylic polymer achieves moderate hardness or adhesiveness. When the adhesive layer 11 and / or the adhesive layer 12 contain the above-mentioned acrylic polymer as an adhesive, the content rate of the acrylic polymer in the adhesive layer is, for example, 85 to 100% by weight. From the viewpoint of achieving high adhesion at room temperature, each of the adhesive layers 11 and 12 may contain, for example, an acrylic oligomer having a raw material monomer composition different from the acrylic polymer. When the adhesive layer 11 and / or the adhesive layer 12 contain such an acrylic oligomer, the acrylic content in the adhesive layer is lower than 100 parts by weight of the adhesive or the acrylic polymer in the adhesive layer. The content of the polymer is, for example, 0.1 to 20 parts by weight. The oligomer preferably contains a monomer unit derived from a (meth) acrylate having a cyclic structure (a (meth) acrylate containing a ring), and an alkyl group derived from a linear or branched alkyl group. Polymer of monomer units of alkyl (meth) acrylates. The ring-containing (meth) acrylate as the monomer unit for forming the oligomer, that is, the ring-containing (meth) acrylate included in the monomer component for forming the oligomer, for example, may be Examples are: cycloalkyl (meth) acrylate, (meth) acrylate having a bicyclic hydrocarbon ring, (meth) acrylate having a hydrocarbon ring of three or more rings, and (meth) )Acrylate. Examples of the cycloalkyl (meth) acrylate include cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, and cyclooctyl (meth) acrylate. ester. Examples of the (meth) acrylic acid ester having a bicyclic hydrocarbon ring include (meth) acrylic acid esters and (meth) acrylic acid isopropyl esters. Examples of the (meth) acrylate having a hydrocarbon ring having three or more rings include dicyclopentyl (meth) acrylate, dicyclopentyloxyethyl (meth) acrylate, and tricyclic (meth) acrylate Amyl ester, 1-adamantyl (meth) acrylate, 2-methyl-2-adamantyl (meth) acrylate, and 2-ethyl-2-adamantyl (meth) acrylate. Examples of the (meth) acrylate having an aromatic ring include phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, and benzyl (meth) acrylate. As the ring-containing (meth) acrylate used for the oligomer, one type of ring-containing (meth) acrylate may be used, or two or more types of ring-containing (meth) acrylates may be used. In this embodiment, it is preferable to use at least one selected from the group consisting of dicyclopentyl acrylate and dicyclopentyl methacrylate as the (meth) acrylate containing a ring for oligomers. . Regarding the ratio of the monomer unit derived from the cyclic-containing (meth) acrylate in the oligomer, it is preferable from the viewpoint of achieving a moderate softness of the adhesive layer formed by containing the oligomer. It is 10 to 90% by weight, more preferably 20 to 80% by weight, and even more preferably 35 to 80% by weight. The (meth) acrylic acid alkyl ester having a linear or branched alkyl group as a monomer unit for forming the above oligomer, that is, a monomer having Examples of the (meth) acrylic acid alkyl ester of a chain or branched chain alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) Isopropyl acrylate, n-butyl (meth) acrylate, second butyl (meth) acrylate, isobutyl (meth) acrylate, third butyl (meth) acrylate, amyl (meth) acrylate , Isoamyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) Isooctyl acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, Dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, decyl (meth) acrylate Hexyl Heptadecyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, undecyl (meth) acrylate, and (meth) acrylic acid Alkyl (meth) acrylic acid alkyl esters having linear or branched alkyl groups having 1 to 20 carbon atoms. As the (meth) acrylic acid alkyl ester used in the oligomer, one kind of (meth) acrylic acid alkyl ester may be used, or two or more kinds of (meth) acrylic acid alkyl ester may be used. In this embodiment, as the alkyl (meth) acrylate used for the oligomer, methyl methacrylate is preferably used. Regarding the ratio of the monomer units derived from the (meth) acrylic acid alkyl ester having a linear or branched alkyl group in the above oligomer, a modest degree of the adhesive layer formed by containing the oligomer is achieved. From the viewpoint of the elastic modulus, it is preferably 10 to 90% by weight, more preferably 15 to 80% by weight, and even more preferably 20 to 60% by weight. In addition, the oligomer may include a carboxyl group-containing monomer, or an amino group-containing monomer, an amine group-containing monomer, a cyano group-containing monomer, a sulfonic acid group-containing monomer, or phosphoric acid. Monomer units of monomers, monomers containing isocyanate groups, monomers containing fluorenimine groups. The weight average molecular weight (Mw) of the oligomer is, for example, 1,000 to 30,000, preferably 1,000 to 20,000, and more preferably 1500 to 10,000. The weight average molecular weight of the oligomer is preferably 1,000 or more from the viewpoint of ensuring a good adhesion with the adhesive layer formed by including the oligomer. On the other hand, it is preferable that the weight average molecular weight of this oligomer is 30,000 or less from a viewpoint of ensuring the adhesive force especially the room temperature with the adhesive layer which consists of the said oligomer. The weight average molecular weight of the oligomer can be measured by a gel permeation chromatography (GPC) method. For example, a GPC measurement device (trade name "HLC-8120GPC", manufactured by Tosoh Co., Ltd.) can be used to determine the weight average molecular weight (Mw) in the form of a standard polystyrene conversion value under the following measurement conditions.・ Column: TSKgel Super AWM-H (upstream side, manufactured by Tosoh Co., Ltd.), TSKgel Super AW4000 (manufactured by Tosoh Co., Ltd.), and TSKgel Super AW2500 (downstream side, manufactured by Tosoh Co., Ltd.) Column size: 6.0 mm for each column × 150 mm • Column temperature (measurement temperature): 40 ° C • Eluent: Tetrahydrofuran (THF) • Flow rate: 0.4 mL / min • Sample injection volume: 20 μL • Sample concentration: approximately 2.0 g / L (tetrahydrofuran solution) • Standard sample: Polystyrene. Detector: Differential refractometer (RI). The adhesive layers 11 and 12 may each contain a silane coupling agent. Examples of the silane coupling agent include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N- Phenyl-aminopropyltrimethoxysilane. Examples of the silane coupling agent include commercially available products such as the trade name "KBM-403" (manufactured by Shin-Etsu Chemical Industry Co., Ltd.). The silane coupling agent is preferably γ-glycidyloxypropyltrimethoxysilane. In the case where the adhesive layer 11 and / or the adhesive layer 12 contains a silane coupling agent, the content of the silane coupling agent in the adhesive layer is better than 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer. It is 0.01 parts by weight or more, and more preferably 0.02 parts by weight or more. The content of the silane coupling agent in the adhesive layer is preferably 1 part by weight or less, more preferably 0.5 part by weight or less, based on 100 parts by weight of the acrylic polymer. The composition related to the content of the silane coupling agent is to make the adhesive layer formed containing the silane coupling agent achieve higher adhesion under humidified conditions, especially in terms of higher adhesion to glass. Better. Each of the adhesive layers 11 and 12 may contain an ultraviolet absorber. Ultraviolet absorbers are chemical species that can efficiently absorb ultraviolet rays and convert the absorbed energy into heat or infrared rays and release them. Examples of such an ultraviolet absorber include a benzotriazole-based ultraviolet absorber, a hydroxyphenyl three-based ultraviolet absorber, a salicylate-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and an oxydiamine. A benzophenone-based ultraviolet absorber and a cyanoacrylate-based ultraviolet absorber. The adhesive layer 11 and / or the adhesive layer 12 may contain one kind of ultraviolet absorber, and may also contain two or more kinds of ultraviolet absorbers. Examples of the benzotriazole-based ultraviolet absorber include 2- (2-hydroxy-5-third butylphenyl) -2H-benzotriazole (trade name "TINUVIN PS", manufactured by BASF Corporation), Phenylpropanoic acid 3- (2H-benzotriazol-2-yl) -5- (1,1-dimethylethyl) -4-hydroxy alkyl ester having 7 to 9 carbon atoms (trade name "TINUVIN 384-2 ", manufactured by BASF Corporation), 3- [3-Third-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazol-2-yl) phenyl] octyl propionate, and 3 -[3-Third-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazol-2yl) phenyl] propionic acid 2-ethylhexyl ester mixture (trade name "TINUVIN 109" , Manufactured by BASF), 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol (trade name "TINUVIN 900", BASF Corporation (Manufactured), 2- (2H-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl ) Phenol (trade name "TINUVIN 928", manufactured by BASF), methyl 3- (3- (2H-benzotriazol-2-yl) -5-tert-butyl-4-hydroxyphenyl) propionate, and Reaction product of polyethylene glycol 300 (trade name "TINUVIN 1130", manufactured by BASF), 2- (2H-benzotriazol-2-yl) -p-cresol (trade name "TINUVIN P", BASF company (Manufactured), 2 (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol (trade name "TINUVIN 234", manufactured by BASF), 2 -[5-chloro-2H-benzotriazol-2-yl] -4-methyl-6- (third butyl) phenol (trade name "TINUVIN 326", manufactured by BASF), 2- (2H- Benzotriazol-2-yl) -4,6-di-tert-pentylphenol (trade name "TINUVIN 328", manufactured by BASF), 2- (2H-benzotriazol-2-yl) -4 -(1,1,3,3-tetramethylbutyl) phenol (trade name "TINUVIN 329", manufactured by BASF), 2,2'-methylenebis [6- (2H-benzotriazole- 2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol] (trade name "TINUVIN 360", manufactured by BASF), 2- (2H-benzotriazol-2-yl ) -6-dodecyl-4-methylphenol (trade name "TINUVIN 571", manufactured by BASF), 2- [2-hydroxy-3- (3,4,5,6-tetrahydrophthalate Formamidine-methyl) -5-methylphenyl] benzotriazole (trade name "Sumisorb 250", manufactured by Sumitomo Chemical Co., Ltd.), and 2,2'-methylenebis [6- ( 2H-benzotriazol-2-yl) -4-third octylphenol] (trade name "Adekastab LA-31", manufactured by ADEKA Corporation). Examples of the hydroxyphenyl tri-series ultraviolet absorber include 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-tri-2-yl) -5-hydroxy Reaction product of phenyl and [(alkoxy group with 10 to 16 carbons) methyl] oxane (trade name "TINUVIN 400", manufactured by BASF), 2- [4,6-bis (2,4 -Dimethylphenyl) -1,3,5-tri-2-yl] -5- [3- (dodecyloxy) -2-hydroxypropoxy] phenol), 2- (2,4 -Dihydroxyphenyl) -4,6-bis- (2,4-dimethylphenyl) -1,3,5-tris with (2-ethylhexyl) -glycidyl ester (commodity Name "TINUVIN 405", manufactured by BASF), 2,4-bis (2-hydroxy-4-butoxyphenyl) -6- (2,4-dibutoxyphenyl) -1,3,5 -Tris (trade name "TINUVIN 460", manufactured by BASF), 2- (4,6-diphenyl-1,3,5-tri-2-yl) -5-[(hexyl) oxy] -phenol (Trade name "TINUVIN 1577", manufactured by BASF Corporation), 2- (4,6-diphenyl-1,3,5-tri-2-yl) -5- [2- (2-ethylhexamethane) Group) ethoxy] -phenol (trade name "Adekastab LA-46", manufactured by ADEKA Corporation), and 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl)- 4,6-bis (4-phenylphenyl) -1,3,5-tri (brand name "TINUVIN 479" , Manufactured by BASF). Examples of the salicylate-based ultraviolet absorber include 2-propenyloxybenzoic acid phenyl ester, 2-propenyloxy-3-methylbenzoic acid phenyl ester, and 2-propenyloxybenzoic acid phenyl ester. Phenylmethylbenzoate, 2-propenyloxy-5-methylbenzoate, 2-propenyloxy-3-methoxybenzoate, 2-hydroxybenzoate, 2- Phenyl hydroxy-3-methylbenzoate, phenyl 2-hydroxy-4-methylbenzoate, phenyl 2-hydroxy-5-methylbenzoate, phenyl 2-hydroxy-3-methoxybenzoate And 2,4-di-third-butylphenyl 3,5-di-third-butyl-4-hydroxybenzoate (trade name "TINUVIN 120", manufactured by BASF Corporation). Examples of the benzophenone-based ultraviolet absorber or oxybenzophenone-based ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-octyloxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 4 -Benzyloxy-2-hydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone (trade name "KEMISORB 111", manufactured by Chemipro Kasei Co., Ltd.), 2,2 ' , 4,4'-tetrahydroxybenzophenone (trade name "SEESORB 106", manufactured by Shipro Kasei Co., Ltd.), and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone . Examples of the cyanoacrylate-based ultraviolet absorber include an alkyl 2-cyanoacrylate, a cycloalkyl 2-cyanoacrylate, an alkoxyalkyl 2-cyanoacrylate, and 2-cyanoacrylic acid. Alkenyl esters and alkynyl 2-cyanoacrylate. Regarding the ultraviolet absorber contained in the adhesive layer 11 and / or the adhesive layer 12, from the viewpoint of having higher ultraviolet absorption and higher light stability, or the viewpoint of easily obtaining an adhesive layer with higher transparency In other words, it is preferably at least one selected from the group consisting of a benzotriazole-based ultraviolet absorber, a hydroxyphenyl tri-based ultraviolet absorber, and a benzophenone-based ultraviolet absorber. The ultraviolet absorber contained in the adhesive layer 11 and / or the adhesive layer 12 is more preferably a benzo group having a hydrocarbon group of 6 or more carbon atoms and a hydroxy group as a substituent and a benzo group bonded to a nitrogen atom constituting a benzotriazole ring. Triazole UV absorber. When the adhesive layer 11 and / or the adhesive layer 12 contain an ultraviolet absorber, regarding the content of the ultraviolet absorber in the adhesive layer, the transmittance of light at a wavelength of 350 nm of the adhesive layer is controlled to achieve a higher value From the viewpoint of ultraviolet absorption, it is preferably 0.01 parts by weight or more, more preferably 0.05 parts by weight or more, and more preferably 0.1 parts by weight or more with respect to 100 parts by weight of the adhesive or the acrylic polymer in the adhesive layer. . In addition, the content of the ultraviolet absorber in the adhesive layer suppresses the occurrence of yellowing of the adhesive accompanied by the addition of the ultraviolet absorber in the adhesive layer, and realizes excellent optical characteristics or high transparency. From a viewpoint, it is preferably 10 parts by weight or less, more preferably 9 parts by weight or less, and still more preferably 8 parts by weight or less based on 100 parts by weight of the adhesive or the acrylic polymer in the adhesive layer. The adhesive layers 11 and 12 may each contain a light stabilizer. When each of the adhesive layers 11 and 12 contains a light stabilizer, it is preferable to include a UV absorber together. Light stabilizers are chemical species that capture free radicals that may be generated by irradiation with light such as ultraviolet rays. Examples of the light stabilizer include amine-based light stabilizers such as a phenol-based light stabilizer, a phosphorus-based light stabilizer, a thioether-based light stabilizer, and a hindered amine-based stabilizer. The adhesive layer 11 and / or the adhesive layer 12 may contain one kind of light stabilizer, and may also contain two or more kinds of light stabilizers. Examples of the phenol-based light stabilizer include 2,6-di-third-butyl-4-methylphenol, 4-hydroxymethyl-2,6-di-third-butylphenol, and 2,6- Di-third-butyl-4-ethylphenol, butylated hydroxyanisole, 3- (4-hydroxy-3,5-di-third-butylphenyl) propionic acid n-octadecyl ester, (4-Hydroxy-3-methyl-5-tert-butyl) benzyl malonate distearyl, tocopherol, 2,2'-methylenebis (4-methyl-6-tert-butyl) Phenol), 2,2'-methylenebis (4-ethyl-6-third-butylphenol), 4,4'-methylenebis (2,6-di-third-butylphenol) , 4,4'-butylene bis (6-third-butyl-m-cresol), 4,4'-thiobis (6-third butyl-m-cresol), styrenated phenol, N, N'-hexamethylene bis (3,5-di-third-butyl-4-hydroxyhydrocinnamonamine), bis (3,5-di-third-butyl-4-hydroxybenzylphosphonic acid ethyl) (Ester), calcium, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-third-butyl-4-hydroxybenzyl) benzene, tetrakis [3- (3,5-di-third-butyl-4-hydroxyphenyl) propanyloxymethyl] methane , 1,6-hexanediol-bis [3- (3,5-di-third-butyl-4-hydroxyphenyl) propionate], 2,2'-sub Bis (4-methyl-6-cyclohexylphenol), 2,2'-methylenebis [6- (1-methylcyclohexyl) -p-cresol], 1,3,5-tris (4 -Third-butyl-3-hydroxy-2,6-dimethylbenzyl) isotricyanic acid, 1,3,5-tris (3,5-di-third-butyl-4-hydroxybenzyl) ) Isotricyanic acid, triethylene glycol-bis [3- (3-third-butyl-4-hydroxy-5-methylphenyl) propionate], 2,2'-oxadiamine bis [ Ethyl 3- (3,5-di-third-butyl-4-hydroxyphenyl) propionate], 6- (4-hydroxy-3,5-di-third-butylaniline) -2, 4-dioctylthio-1,3,5-tri, terephthalic acid bis [2-thirdbutyl-4-methyl-6- (2-hydroxy-3-thirdbutyl-5- Methylbenzyl) phenyl] ester, 3,9-bis {2- [3- (3- (third-butyl-4-hydroxy-5-methylphenyl) propanyloxy] -1,1- Dimethylethyl} -2,4,8,10-tetraoxaspiro [5.5] undecane, and 3,9-bis {2- [3- (3,5-di-third-butyl- 4-hydroxyphenyl) propanyloxy] -1,1-dimethylethyl} -2,4,8,10-tetraoxaspiro [5.5] undecane. Examples of the phosphorus-based light stabilizer include tris (nonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, and tris [2-tert-butyl phosphite] 4- (3-tert-butyl-4-hydroxy-5-methylphenylthio) -5-methylphenyl] ester, tridecyl phosphite, octyl diphenyl phosphite, Di (decyl) monophenyl phosphate, bis (tridecyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2, 4-Di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,4,6 -Tri-tert-butylphenyl) pentaerythritol diphosphite, tetrakis (tridecyl) isopropylidene diphenol diphosphite, tetrakis (tridecyl) -4,4'-n-butylene Bis (2-third butyl-5-methylphenol) diphosphite, hexa (tridecyl) -1,1,3-tris (2-methyl-4-hydroxy-5-third Butylphenyl) butane triphosphite, tetra (2,4-di-third-butylphenyl) phenylene diphosphinic acid diester, 9,10-dihydro-9-oxa-10 -Phosphaphenanthrene-10-oxide and tris (2-[(2,4,8,10- - tert-butyl-dibenzo [d, f] [1,3,2] hept-phospholene-dioxa-6-yl) oxy] ethyl) amine. Examples of the thioether-based light stabilizer include dialkyl thiodipropionate such as dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiodipropionate. Ester compounds, and β-alkyl mercaptopropionate compounds of polyhydric alcohols such as tetra [methylene (3-dodecylthio) propionate] methane. Examples of the amine-based light stabilizer include a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol (trade name "TINUVIN 622", (Manufactured by BASF), the polymer and N, N ', N'',N'''-tetra- (4,6-bis- (butyl- (N-methyl-2,2,6,6- Tetramethylpiperidin-4-yl) amino) -tri-2-yl) -4,7-diazadecane-1,10-diamine one to one reaction product (trade name "TINUVIN 119" , Manufactured by BASF), poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-tri-2-4-diyl} {2,2,6 , 6-tetramethyl-4-piperidinyl} imino] hexamethylene {(2,2,6,6-tetramethyl-4-piperidinyl) imino} (trade name "TINUVIN 944 ", manufactured by BASF), bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate (trade name" TINUVIN 770 ", manufactured by BASF), sebacic acid bis ( Reaction product of 2,2,6,6-tetramethyl-1- (octyloxy) -4-piperidinyl) ester with 1,1-dimethylethyl hydroperoxide and octane (trade name "TINUVIN 123" manufactured by BASF), [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butylmalonate bis (1,2,2 , 6,6-pentamethyl-4-piperidinyl) ester (trade name "TINUVIN 144", BASF company (Manufactured), cyclohexane, and N-butyl 2,2,6,6-tetramethyl-4-piperidinamine-2,4,6-trichloro-1,3,5-tris reaction product Reaction product with 2-aminoethanol (trade name "TINUVIN 152", manufactured by BASF), bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, and decyl A mixture of methyl 1,2,2,6,6-pentamethyl-4-piperidine diacid (trade name "TINUVIN 292", manufactured by BASF), and 1,2,3,4-butane tetra Carboxylic acid with 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethylethyl) -2,4,8, A mixed ester of 10-tetraoxaspiro [5.5] undecane (trade name "Adekastab LA-63P", manufactured by ADEKA Corporation). As the amine-based stabilizer, a hindered amine-based stabilizer is particularly preferred. In the case where the adhesive layer 11 and / or the adhesive layer 12 contain a light stabilizer, the content of the light stabilizer in the adhesive layer, from the viewpoint of achieving sufficient light resistance of the adhesive layer, is relative to adhesion. 100 parts by weight of the adhesive or acrylic polymer in the agent layer is preferably 0.1 parts by weight or more, and more preferably 0.2 parts by weight or more. In addition, regarding the content of the light stabilizer in the adhesive layer, from the viewpoint of suppressing the coloration caused by the light stabilizer in the adhesive layer and achieving high transparency, the content of the light stabilizer in the adhesive layer is higher than that in the adhesive layer or 100 parts by weight of the acrylic polymer is preferably 5 parts by weight or less, and more preferably 3 parts by weight or less. The adhesive or acrylic polymer contained in the adhesive layer 11 and / or the adhesive layer 12 may be crosslinked by a crosslinking agent other than the above-mentioned copolymerizable crosslinking agent. The gel fraction of the adhesive layer 11 and / or the adhesive layer 12 can be adjusted by applying the cross-linking of the adhesive or the acrylic polymer caused by the cross-linking agent. Examples of such a crosslinking agent include an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a melamine-based crosslinking agent, a peroxide-based crosslinking agent, a urea-based crosslinking agent, and a metal alkoxide-based crosslinking agent. Crosslinking agent, metal chelate crosslinking agent, metal salt crosslinking agent, carbodiimide crosslinking agent, oxazoline crosslinking agent, aziridine crosslinking agent, and amine crosslinking Agent. The adhesive layer 11 and / or the adhesive layer 12 may contain one kind of the crosslinking agent, and may also contain two or more kinds of the crosslinking agent. In this embodiment, it is preferable to use an isocyanate-based crosslinking agent and / or an epoxy-based crosslinking agent. Examples of the isocyanate-based crosslinking agent include lower aliphatic polyisocyanates, alicyclic polyisocyanates, and aromatic polyisocyanates. Examples of the lower aliphatic polyisocyanates include 1,2-ethylidene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate. Examples of the alicyclic polyisocyanates include cyclopentyl diisocyanate, cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated xylene diisocyanate. Examples of the aromatic polyisocyanates include 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate. Examples of the isocyanate-based crosslinking agent include trimethylolpropane / toluene diisocyanate adduct (trade name "Coronate L", manufactured by Nippon Polyurethane Industry Co., Ltd.), and trimethylolpropane / hexadecane. Methyl diisocyanate adduct (trade name "Coronate HL", manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane / xylylene diisocyanate adduct (trade name "Takenate D-110N", Mitsui Chemical Co., Ltd.) and other commercially available products. Examples of the epoxy-based crosslinking agent (multifunctional epoxy compound) include N, N, N ', N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, and 1,3- Bis (N, N-diglycidylaminomethyl) cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol di Glycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol Anhydride polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycidyl adipate, diglycidyl phthalate, triglycidyl isocyanurate , Resorcinol diglycidyl ether, and bisphenol-S-diglycidyl ether. Examples of the epoxy-based crosslinking agent include epoxy-based resins having two or more epoxy groups. In addition, as the epoxy-based crosslinking agent, commercially available products such as the trade name "Tetrad C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) can also be mentioned. When the adhesive layer 11 and / or the adhesive layer 12 contain the above-mentioned crosslinking agent for crosslinking acrylic polymers, the content of the crosslinking agent in the adhesive layer makes the adhesive From the viewpoint of achieving sufficient adhesion reliability of the adhesive layer to the adherend, it is preferably 0.001 part by weight or more, and more preferably 0.01 part by weight, relative to 100 parts by weight of the adhesive or the acrylic polymer in the adhesive layer. the above. In addition, regarding the content of the cross-linking agent in the adhesive layer, from the viewpoint that the adhesive layer exhibits moderate softness and achieves good adhesion, compared with the adhesive or acrylic polymerization in the adhesive layer 100 parts by weight, preferably 10 parts by weight or less, and more preferably 5 parts by weight or less. The adhesive layers 11 and 12 may further contain a coloring agent such as a cross-linking accelerator, a tackifier resin, an anti-aging agent, a filler, a pigment or a dye, an antioxidant, a chain transfer agent, a plasticizer, a softener, etc. Additives such as surfactants and antistatic agents. Examples of the tackifying resin include rosin derivatives, polyterpene resins, petroleum resins, and oil-soluble phenols. The thickness of the adhesive layer 11 is preferably 5 μm or more, and more preferably 10 μm or more, from the viewpoint of achieving sufficient adhesion of the adhesive tape X to the adherend on the adhesive layer 11 side. It is 15 μm or more. From the viewpoint of ease of formation, the thickness of the adhesive layer 11 is preferably 1,000 μm or less, more preferably 900 μm or less, and even more preferably 800 μm or less. The thickness of the adhesive layer 12 is preferably 5 μm or more, more preferably 10 μm or more, from the viewpoint of achieving sufficient adhesion of the adhesive tape X to the adherend on the adhesive layer 12 side. It is 15 μm or more. From the viewpoint of ease of formation, the thickness of the adhesive layer 11 is preferably 1,000 μm or less, more preferably 900 μm or less, and even more preferably 800 μm or less. For an adhesive tape X having a laminated structure including the substrate 10 and the adhesive layers 11 and 12 as described above, the tear strength in the width direction of the substrate is 0.5 N or less, and the thickness in the mechanical direction of the substrate is 1.5. The doffer tear strength is 1 N or more. Regarding the Emmydorff tear strength in the width direction of the substrate of the adhesive tape X, it is preferably 0.45 N or less, more preferably 0.4 N or less, and even more preferably 0.3 N or less. Regarding the tear strength of the Emmentolf in the mechanical direction of the substrate of the adhesive tape X, it is preferably 1.1 N or more, more preferably 1.3 N or more, and even more preferably 1.5 N or more. The Emmendorf tear strength is a value measured in accordance with JIS K 7128-2. The haze in the thickness direction of the optical adhesive tape X is preferably 3% or less, more preferably 2.5% or less, more preferably 2% or less, even more preferably 1.5% or less, and even more preferably 1% or less. The haze is a value measured in accordance with JIS K 7136. Regarding the adhesive tape X, the total light transmittance in the visible light wavelength range is, for example, 85% or more. The total light transmittance is a value measured in accordance with JIS K 7361-1. The adhesive tape X may be provided with a release liner (isolation film) in a manner of covering the adhesive surface 11 a of the adhesive layer 11. The adhesive tape X may be provided with a release liner (isolation film) in a manner of covering the adhesive surface 12 a of the adhesive layer 12. The release liner is a component for protecting the adhesive layers 11 and 12 of the adhesive tape X from being exposed, and is used to peel the adhesive tape X from the adhesive tape X when the adhesive tape X is attached to the adherend. Examples of the release liner include a substrate having a release-treated layer, a low-adhesive substrate including a fluoropolymer, and a low-adhesive substrate including a non-polar polymer. The surface of the release liner may be subjected to a release treatment, an antifouling treatment, or an antistatic treatment. The thickness of the release liner is, for example, 5 to 200 μm. Specifically, the adhesive tape X may be in the form of a sheet with release liners covering the adhesive surfaces 11a, 12a of the adhesive layers 11, 12 or may be alternately arranged with the adhesive tape X and the release liner. The system has a release liner and is wound into a roll shape. The adhesive tape X having the above-mentioned structure can be manufactured, for example, by forming the adhesive layers 11 and 12 separately, and then bonding the adhesive layers 11 and 12 to the substrate 10, respectively. The adhesive layer 11 can be formed, for example, by coating an adhesive composition for forming the adhesive layer 11 on a specific release liner to form an adhesive composition layer, and then laminating the adhesive composition layer. The release liner hardens the adhesive composition between the release liners. On the other hand, the adhesive layer 12 can be formed, for example, by coating an adhesive composition for forming the adhesive layer 12 on a specific release liner to form an adhesive composition layer, and applying the adhesive composition to the adhesive composition. A release liner was further laminated on the layer, and the adhesive composition was hardened between the release liners. As the adhesive composition for forming the adhesive layer 11 and / or the adhesive composition for forming the adhesive layer 12, for example, an adhesive composition that can be hardened by polymerization reaction by irradiation with active energy rays can be used. That is, the adhesive layer 11 and / or the adhesive layer 12 are hardened | cured material of an active energy ray hardening-type adhesive composition, for example. The active energy ray-curable adhesive composition for forming an acrylic adhesive layer contains at least a monomer, an oligomer, and a photopolymerization initiator for forming an acrylic polymer. The monomers and oligomers in the composition may be provided in the form of so-called partial polymers which are used to form a specific composition of monomer mixtures of acrylic polymers. Moreover, this adhesive composition may contain other components used as needed as a component of the adhesive layer formed. Examples of the active energy rays that are irradiated to the active energy ray-curable adhesive composition to harden the adhesive layer include ultraviolet rays, alpha rays, beta rays, gamma rays, neutron beams, and electron beams. UV. For an active energy ray-curable adhesive composition for forming an acrylic adhesive layer that is irradiated with active energy rays, an initial reaction occurs through activation of a photopolymerization initiator, and a polymerization reaction is performed to form an acrylic polymerization. Thing. If an active energy ray irradiation such as ultraviolet irradiation is used as the hardening method of the hardening adhesive composition for forming the adhesive layer, even when the coating film of the adhesive composition is relatively thick, it is easy to obtain appropriate hardening. Adhesive layer. Therefore, the composition of the adhesive layer 11 that is a hardened product of the active energy ray-curable adhesive composition is preferable for achieving the adhesive layer 11 that is sufficiently hardened even if it is relatively thick. The composition of the adhesive layer 12 which is a hardened body of the active energy ray-curable adhesive composition is preferable in terms of achieving the adhesive layer 12 that is sufficiently hardened even if it is relatively thick. Examples of the photopolymerization initiator include benzoin ether-based photopolymerization initiator, acetophenone-based photopolymerization initiator, α-keto alcohol-based photopolymerization initiator, and aromatic sulfonyl chloride-based photopolymerization. Starter, photoactive oxime-based photopolymerization initiator, benzoin-based photopolymerization initiator, benzophenone-based photopolymerization initiator, benzophenone-based photopolymerization initiator, ketal-based photopolymerization initiator Agent and 9-oxysulfur Department of photopolymerization initiator. Examples of the benzoin ether-based photopolymerization initiator include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and 2,2-dimethoxy-1,2-di Phenylethane-1-one. Examples of the acetophenone-based photopolymerization initiator include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, and 1-hydroxycyclohexylbenzene Ketone (α-hydroxycyclohexylphenyl ketone), 4-phenoxydichloroacetophenone, and 4- (third butyl) dichloroacetophenone. Examples of the α-keto alcohol-based photopolymerization initiator include 2-methyl-2-hydroxyphenylacetone and 1- [4- (2-hydroxyethyl) phenyl] -2-methylpropane-1 -ketone. Examples of the aromatic sulfonyl chloride-based photopolymerization initiator include 2-naphthalenesulfonyl chloride. Examples of the photoactive oxime-based photopolymerization initiator include 1-phenyl-1,2-propanedione-2- (O-ethoxycarbonyl) -oxime. Examples of the benzoin-based photopolymerization initiator include benzoin. Examples of the benzophenazine-based photopolymerization initiator include benzophenazine. Examples of the benzophenone-based photopolymerization initiator include benzophenone, benzophenobenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyvinyl. Benzophenone. Examples of the ketal-based photopolymerization initiator include benzophenone dimethyl ketal. As 9-oxysulfur Examples of photopolymerization initiators include 9-oxysulfur , 2-chloro9-oxysulfur 2-methyl 9-oxysulfur 2,4-dimethyl 9-oxosulfur Isopropyl 9-oxysulfur 2,4-diisopropyl 9-oxysulfur Dodecyl 9-oxosulfur . The content of the photopolymerization initiator in the active energy ray-curable adhesive composition is, for example, 0.01 to 3% by weight. As the adhesive composition for the formation of the adhesive layer 11 and / or the adhesive composition for the formation of the adhesive layer 12, an acrylic polymer already contained as an adhesive may be used and may be cured by heating and drying, for example. Solvent-based adhesive composition or emulsion-type adhesive composition. The composition may also contain other components as needed as components of the formed adhesive layer. The acrylic polymer in the adhesive composition is obtained by polymerizing a raw material monomer component for forming an acrylic polymer. Examples of the polymerization method include solution polymerization, emulsion polymerization, and block polymerization. When performing the solution polymerization, for example, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, esters, and ketones can be used as a solvent. Examples of the aromatic hydrocarbon solvents include toluene and benzene. Examples of the solvent of the aliphatic hydrocarbon include n-hexane and n-heptane. Examples of the alicyclic hydrocarbon solvent include cyclohexane and methylcyclohexane. Examples of the solvents for the esters include ethyl acetate and n-butyl acetate. Examples of the ketone solvents include methyl ethyl ketone and methyl isobutyl ketone. In the solution polymerization, one kind of solvent may be used, or two or more kinds of solvents may be used. When polymerizing a raw material monomer component in order to obtain an acrylic polymer, a polymerization initiator can be used. Depending on the kind of polymerization reaction, for example, a photopolymerization initiator or a thermal polymerization initiator can be used. In the polymerization, one polymerization initiator may be used, or two or more polymerization initiators may be used. Examples of the photopolymerization initiator include the aforementioned benzoin-based photopolymerization initiator, acetophenone-based photopolymerization initiator, α-ketoalcohol-based photopolymerization initiator, and aromatic sulfonyl chloride-based photopolymerization. Starter, photoactive oxime-based photopolymerization initiator, benzoin-based photopolymerization initiator, benzophenone-based photopolymerization initiator, benzophenone-based photopolymerization initiator, ketal-based photopolymerization initiator Agent and 9-oxysulfur Department of photopolymerization initiator. The usage-amount of a photoinitiator is 0.01-3 weight part with respect to the total amount (100 weight part) of monomer components, for example. Examples of the thermal polymerization initiator include an azo-based polymerization initiator, a peroxide-based polymerization initiator, and a redox-based polymerization initiator. Examples of the azo-based polymerization initiator include 2,2'-azobisisobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, and 2,2'-azobis ( 2-methylpropanoic acid) dimethyl ester, and 4,4'-azobis-4-cyanovaleric acid. Examples of the peroxide-based polymerization initiator include benzamidine peroxide and tert-butyl maleate peroxide. The usage-amount of a thermal-polymerization initiator is 0.05-0.3 weight part with respect to the total amount (100 weight part) of monomer components, for example. In order to adjust the molecular weight of the acrylic polymer when used to obtain the polymerization of the acrylic polymer, a chain transfer agent may be used. Examples of the chain transfer agent include α-thioglycerol, 2-mercaptoethanol, 2,3-dimercapto-1-propanol, octyl mercaptan, third nonyl mercaptan, and dodecyl mercaptan (lauryl mercaptan). ), Third-dodecyl mercaptan, glycidyl mercaptan, thioglycolic acid, methyl thioglycolate, ethyl thioglycolate, propyl thioglycolate, butyl thioglycolate, third butyl thioglycolate, thioglycolic acid 2- Ethylhexyl, octyl thioglycolate, isooctyl thioglycolate, decyl thioglycolate, and dodecyl thioglycolate. As the chain transfer agent, one kind of chain transfer agent may be used, or two or more kinds of chain transfer agents may be used. In this embodiment, as the chain transfer agent, α-thioglycerin is preferably used. The used amount of the chain transfer agent is, for example, 0.01 to 0.5 parts by weight based on the total amount (100 parts by weight) of the monomer components used to obtain the acrylic polymer. When the above-mentioned acrylic oligomer is included in the adhesive composition for forming an adhesive layer such as an active energy ray-curable adhesive composition, or a solvent-based adhesive composition, an emulsion-type adhesive composition, or the like, the oligomerization It can be obtained by polymerizing a raw material monomer component of a specific composition. Examples of the polymerization method include solution polymerization, emulsion polymerization, and block polymerization. As the solvent used for the solution polymerization, those described above as the solvent that can be used for the solution polymerization of the acrylic polymer to be obtained can be cited. In this solution polymerization, one kind of solvent may be used, or two or more kinds of solvents may be used. When the raw material monomer component is polymerized in order to obtain the oligomer, a polymerization initiator may be used. As the polymerization initiator, a photopolymerization initiator or a thermal polymerization initiator described above as a polymerization initiator that can be used to obtain a polymerization of an acrylic polymer can be cited. In the polymerization, one polymerization initiator may be used, or two or more polymerization initiators may be used. For example, the base material 10 included in the adhesive tape X manufactured as described above is a polyester-based base material as described above. Such a structure is preferable for allowing the double-sided adhesive tape substrate and even the adhesive tape X to enjoy various characteristics that a polyester-based substrate such as heat resistance, transparency, and dimensional stability can easily exhibit. The base material 10 included in the adhesive tape X is a uniaxially stretched polyester-based base material in the width direction as described above. The thickness of the substrate 10 is 75 μm or more, and preferably 80 μm or more, as described above. As described above, the thickness of the substrate 10 is preferably 150 μm or less, and more preferably 125 μm or less. In the case where the tear strength of the double-sided adhesive tape, such as the tear strength of the Emersondorf, is strongly controlled by the mechanical characteristics of the base material, these structures are suitable for the adhesive tape X to achieve the Emersondorf tear strength in the width direction of the substrate The above-mentioned configuration is 0.5 N or less, and the Emersondorf tear strength of the substrate in the mechanical direction is 1 N or more. In addition, the Emmendorf tear strength in the width direction of the base material of the adhesive tape X is 0.5 N or less, preferably 0.45 N or less, more preferably 0.4 N or less, and more preferably 0.3 N or less as described above. In addition, the Emmydorff tear strength in the mechanical direction of the base material of the adhesive tape X is 1 N or more, preferably 1.1 N or more, more preferably 1.3 N or more, and more preferably 1.5 N or more as described above. These components are suitable for enabling the adhesive tape X to achieve a good hand tearability in the width direction of the substrate in which the Emildorf tear strength is relatively significantly lower than 0.5 N. In addition, a configuration in which the tear strength of Emmendorf in the mechanical direction of the substrate is twice or more the width direction of the substrate is preferable for improving the directivity of the adhesive tape X in tearing in the substrate width direction. Therefore, this configuration is preferable for a case where the peeling force is applied to the mechanical direction of the base material of the adhesive tape X when the adhesive tape X is attached to the adherend, without tearing. In the case of this adhesive tape X, it peels from an adherend suitably. Specifically, it is preferable for the following case: when the adhesive tape X is attached to the adherend and then peeled off and then reattached (secondary processing operation), a peeling force is applied to the adhesive tape X. In the mechanical direction of the substrate, the adhesive tape X is appropriately peeled from the adherend without tearing the adhesive tape X. In addition to the substrate width direction, the optical double-sided adhesive tape which is also easily torn in the mechanical direction of the substrate tends to be easily broken during peeling in a secondary processing operation and difficult to peel appropriately. The optical double-sided adhesive tape that has been cracked cannot be used for re-attachment. On the other hand, the adhesive tape X has a material strength in the mechanical direction of the substrate, which is sufficiently larger than that of the substrate in the width direction of the substrate, which is suitable for achieving good hand tearability in the width direction of the substrate. It is suitable to make the peeling force act on the mechanical direction of the substrate during the secondary processing operation, and to peel off properly without tearing. As described above, the adhesive tape X is suitable for achieving good hand tearability and high secondary processability while having a polyester-based substrate on one side. As described above, the in-plane phase difference of the substrate 10 of the adhesive tape X is preferably 1500 nm or more, more preferably 3000 nm or more, and even more preferably 6000 nm or more. This configuration is preferable for the case where an adhesive tape X is provided in a liquid crystal display device so as to fill the space between the transparent cover forming the forefront of the display screen and the liquid crystal panel in the device, for example, to suppress The so-called blanking phenomenon occurs when the display screen is viewed through a lens with a polarizing function such as polarized sunglasses. In addition, there is a tendency that the larger the in-plane phase difference of the substrate 10 is, and when the adhesive tape X is provided in the liquid crystal display device so as to fill the space between the transparent cover and the liquid crystal panel, for example, via a belt such as polarized sunglasses The so-called color unevenness is more suppressed when the lens with the polarizing function sees the display screen. [Examples] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. [Production example of acrylic oligomer] In a reaction container, α- containing 60 parts by weight of dicyclopentyl methacrylate (DCPMA) and 40 parts by weight of methyl methacrylate (MMA) as a chain transfer agent A mixture of 3.5 parts by weight of thioglycerin and 100 parts by weight of toluene as a polymerization solvent was stirred at 70 ° C for 1 hour under a nitrogen atmosphere. Then, 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator was added to the mixture in the reaction container to prepare a reaction solution, and the reaction was performed at 70 ° C for 2 hours. Then, reaction was performed at 80 degreeC for 2 hours. Thereafter, the reaction solution in the reaction container was placed under a temperature atmosphere of 130 ° C, and toluene, a chain transfer agent, and unreacted monomers were dried and removed from the reaction solution. Thus, a solid acrylic oligomer was obtained. The weight average molecular weight (Mw) of the acrylic oligomer was 5.1 × 10 3 . [Preparation Example of Acrylic Adhesive Composition C1] Containing 78 parts by weight of 2-ethylhexyl acrylate (2EHA), 18 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 2-hydroxy acrylate 0.035 parts by weight of a first photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation) and a second photopolymerization initiator (trade name "Irgacure 184") were added to 4 parts by weight of a monomer mixture of ethyl acetate (HEA). ", Manufactured by BASF) 0.035 parts by weight, the viscosity of the mixture was measured using a viscosity measuring device, and ultraviolet rays were irradiated with an ultraviolet irradiation device until the viscosity of the mixture became approximately 20 Pa · s. In the viscosity measurement, the rotation speed of the rotor of the device was set to 10 rpm, and the measurement temperature was set to 30 ° C. Thereby, a part of the polymer obtained by partially polymerizing a monomer component in the mixture, that is, a prepolymer composition (containing a monomer component that has not been polymerized) is obtained. Then, 100 parts by weight of the prepolymer composition, 11.8 parts by weight of the above-mentioned acrylic oligomer, 17.6 parts by weight of 2-hydroxyethyl acrylate (HEA), and 0.26-hexanediol diacrylate (HDDA) were 0.294. A part by weight and 0.353 part by weight of a silane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed to obtain an acrylic adhesive composition (acrylic adhesive composition C1). [Preparation Example of Acrylic Adhesive Composition C2] In a flask (reaction container) equipped with a loop condenser, a nitrogen introduction tube, a stirrer, and a thermometer, 100 parts by weight of n-butyl acrylate (BA) and acrylic acid ( AA) 5 parts by weight, 0.075 parts by weight of 2-hydroxyethyl acrylate (HEA), 0.2 parts by weight of benzamidine peroxide (trade name "Nyper BW", manufactured by Nippon Oil & Fat Co., Ltd.) as a polymerization initiator, and A mixture of 205 parts by weight of ethyl acetate as a polymerization solvent was smoothly stirred under a nitrogen atmosphere, and a reaction was performed at 63 ° C for 4 hours. Thereby, a solution (acrylic polymer solution) containing an acrylic polymer at a concentration of about 35% by weight was obtained. Then, the acrylic polymer solution was diluted with ethyl acetate so that the acrylic polymer concentration became 29% by weight, and then 0.6 parts by weight of the acrylic polymer solution was added to 100 parts by weight of the acrylic polymer. Trimethylolpropane / toluene diisocyanate adduct (trade name "Coronate L", manufactured by Nippon Polyurethane Industry Co., Ltd.) and 0.075 parts by weight of a silane coupling agent (trade name "KBM-403", Shin-Etsu Chemical Industry Co., Ltd. (Manufactured by the company), and mixed at 25 ° C. for about 1 minute to obtain a solvent-based acrylic adhesive composition (acrylic adhesive composition C2). [Example 1] <Formation of the first adhesive layer> The above-mentioned acrylic adhesive was applied to a polyethylene terephthalate (PET) -based release liner (125 μm thick, manufactured by Nitto Denko Corporation). Composition C1 forms an adhesive composition layer. Then, a PET-based release liner (125 μm thick, manufactured by Nitto Denko Corporation) was laminated on the adhesive composition layer to cover the adhesive composition layer to block oxygen. In this way, a laminated body (laminated body L1 ') having a laminated layer of [release liner / adhesive composition layer / release liner] was obtained. Then, the laminated body L1 'was irradiated with an illuminance of 3 mW / cm from the side of one of its release liners using a black light (manufactured by Toshiba Corporation). 2 UV for 300 seconds. Thereby, the adhesive composition layer of the laminated body L1 'is hardened to form an adhesive layer (first adhesive layer), and the substrate having [release liner / adhesive layer (first adhesive layer) / release liner] is obtained. Laminated body (laminated body L1). The thickness of the first adhesive layer in the multilayer body L1 was 100 μm. <Formation of second adhesive layer> The above-mentioned acrylic adhesive composition C1 was coated on a PET-based release liner (125 μm thick, manufactured by Nitto Denko Corporation) to form an adhesive composition layer. Then, a PET-based release liner (125 μm thick, manufactured by Nitto Denko Corporation) was laminated on the adhesive composition layer to cover the adhesive composition layer to block oxygen. In this way, a laminated body (laminated body L2 ') having a laminated layer of [release liner / adhesive composition layer / release liner] was obtained. Then, the laminated body L2 'was irradiated with an illuminance of 3 mW / cm from the side of one of its release liners using a black light (manufactured by Toshiba Corporation). 2 UV for 300 seconds. Thereby, the adhesive composition layer of the laminated body L2 'is hardened to form an adhesive layer (second adhesive layer), and the substrate having [release liner / adhesive layer (second adhesive layer) / release liner] is obtained. Laminated body (laminated body L2). The thickness of the second adhesive layer in the multilayer body L2 was 500 μm. <Production of double-sided adhesive tape for optics> Corona is prepared on both sides of a polyethylene terephthalate film (trade name "COSMOSHINE SRF", with a phase difference of 8400, manufactured by Toyobo Co., Ltd.) with a thickness of 80 μm. Processed film (film F 1 ), After peeling off one release liner from the laminated body L1 (release liner / first adhesive layer / release liner), the surface of the first adhesive layer exposed by the peeling is peeled off with one side. The first adhesive layer of the pad is bonded to the film F 1 One side. Thereby, having [Release Liner / First Adhesive Layer / Film F 1 ] Laminated body. Next, after peeling off one release liner from the laminated body L2 (release liner / second adhesive layer / release liner), a release liner was attached to one side through the surface of the second adhesive layer exposed by the peeling. The second adhesive layer of the pad is bonded to the film F 1 The other side. In this way, a film F having [release liner / first adhesive layer (thickness 100 μm) / base material] was produced 1 (Thickness 80 μm) / second adhesive layer (thickness 500 μm) / release liner] laminated optical double-sided adhesive tape. Except for the thickness of the release liner, the thickness of the optical double-sided adhesive tape of Example 1 was 680 μm. [Example 2] A film made of a polyethylene terephthalate film having a thickness of 80 μm (a film obtained by replacing the easy-adhesive layer of "COSMOSHINE SRF" with an easy-adhesive layer for hard coating applications, in-plane phase Difference of 8400, manufactured by Toyobo Co., Ltd. 2 ) Instead of membrane F 1 Except as a base material of the optical double-sided adhesive tape, the optical double-sided adhesive tape of Example 2 was produced in the same manner as in Example 1. Except for the thickness of the release liner, the thickness of the optical double-sided adhesive tape of Example 2 was 680 μm. [Example 3] Except that the thickness of the second adhesive layer was set to 100 μm instead of 500 μm, a double-sided optical tape for Example 3 was produced in the same manner as in Example 1. Except the thickness of the release liner, the thickness of the optical double-sided adhesive tape of Example 3 was 280 μm. [Example 4] The above-mentioned acrylic adhesive composition C2 was applied to a film F 1 After drying on one side, it is heated at 130 ° C for 60 seconds to dry and harden. 1 An adhesive layer (first adhesive layer) having a thickness of 12 μm was formed thereon. Then, a PET-based release liner (125 μm thick, manufactured by Nitto Denko Corporation) was attached to the surface of the adhesive layer. Thereby, a laminated body (laminated body L3) having a laminated layer of [release liner / adhesive layer (first adhesive layer) / release liner] was obtained. On the other hand, the acrylic adhesive composition C2 was coated on one side of a PET-based release liner (125 μm thick, manufactured by Nitto Denko Corporation), and then dried at 130 ° C. for 60 seconds and dried. It hardened, and formed the 12-micrometer-thick adhesive layer (2nd adhesive layer) on this release liner. Then, the laminated body L3 is passed through its film F. 1 The side surface is adhered to the surface of the adhesive layer. In this way, a film F having [release liner / first adhesive layer (thickness: 12 μm) / base material] was produced 1 The optical double-sided adhesive tape of Example 4 composed of a laminated layer (thickness 80 μm) / second adhesive layer (thickness 12 μm) / release liner]. Except for the thickness of the release liner, the thickness of the optical double-sided adhesive tape of Example 4 was 104 μm. [Comparative Example 1] A film obtained by performing a corona treatment on both sides of a polyethylene terephthalate film (trade name "XD500P" with a phase difference of 3000, manufactured by Toray Industries, Ltd.) with a thickness of 75 μm (Film F 3 ) Instead of membrane F 1 As a base material of the optical double-sided adhesive tape, and except that the thickness of the second adhesive layer was set to 100 μm instead of 500 μm, the optical double-sided of Comparative Example 1 was produced in the same manner as in Example 1. Adhesive tape. The thickness of the optical double-sided adhesive tape of Comparative Example 1 except for the thickness of the release liner was 275 μm. [Comparative Example 2] Using film F 3 Instead of membrane F 1 Except as a base material of the optical double-sided adhesive tape, the optical double-sided adhesive tape of Comparative Example 2 was produced in the same manner as in Example 4. The thickness of the optical double-sided adhesive tape of Comparative Example 2 except for the thickness of the release liner was 104 μm. <Emildorf Asphalt Tear Strength> For each sample piece (60 mm × 75 mm) cut out from the double-sided adhesive tape for optical use of the examples and comparative examples, an Emildorf Assay tear strength measuring device (trade name "Ai "Mandolph Tear Tester", manufactured by TESTER SANGYO Co., Ltd.), to measure the Aidolph's tear strength (N) and the direction of MD (MD) of the tape substrate. Randolph tear strength (N). This measurement is performed in accordance with JIS K 7128-2. A cut-out of 20 mm in length extending from the end portion in the measurement direction (TD or MD) is provided in the sample piece for measurement in advance. In this measurement, the resistance to the tear load imparted to the sample piece by the device in such a way that the slit is further extended is measured. The measurement maximum of the above-mentioned device used in this measurement was 1 N. The results of this measurement are shown in Table 1. <Hand tearability> The hand tearability in the width direction of the substrate was examined for each optical double-sided adhesive tape of the examples and comparative examples. Specifically, with respect to the optical double-sided adhesive tape on which the two release liners have been peeled off, an attempt was made to tear the substrate in the width direction of the substrate by hand. In this manual inspection, the case where it can be easily torn is evaluated as good hand tearability (性), and the case where it cannot be torn is evaluated as poor hand tearability (×). The results are shown in Table 1. <Haze> For each optical double-sided adhesive tape of the Examples and Comparative Examples, a haze meter HM-150 (Murakami Color Technology Research Institute Co., Ltd.) was used to measure the haze (according to the method specified in JIS K 7136 %). This measurement is performed on an optical adhesive tape in a state where two release liners are peeled off and attached to a glass slide (trade name "Slide S1112", thickness 1.0-1.2 mm, manufactured by Matsuba Glass Industrial Co., Ltd.). get on. The results are shown in Table 1. [Evaluation] The optical double-sided adhesive tapes of Examples 1 to 4 having the constitution of the present invention all achieved good hand tearability. In contrast, the optical double-sided adhesive tapes of Comparative Examples 1 and 2 were not able to tear in the width direction of the substrate by hand, and good hand tearability was not achieved. [Table 1]

10‧‧‧基材10‧‧‧ Substrate

11‧‧‧黏著劑層(第1黏著劑層)11‧‧‧Adhesive layer (first adhesive layer)

11a‧‧‧黏著面11a‧‧‧ Adhesive surface

12‧‧‧黏著劑層(第2黏著劑層)12‧‧‧ Adhesive layer (second adhesive layer)

12a‧‧‧黏著面12a‧‧‧ Adhesive surface

X‧‧‧黏著帶(光學用雙面黏著帶)X‧‧‧ Adhesive tape (double-sided adhesive tape for optics)

圖1係本發明之一實施形態之光學用雙面黏著帶之局部剖視圖。FIG. 1 is a partial cross-sectional view of an optical double-sided adhesive tape according to an embodiment of the present invention.

Claims (8)

一種光學用雙面黏著帶，其具有包含第1黏著劑層、第2黏著劑層、及該第1及第2黏著劑層之間的透明基材之積層構造，且 上述透明基材為基材寬度方向單軸延伸聚酯系基材且具有75 μm以上之厚度， 基材寬度方向之艾勉道夫(Elmendorf)撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上。An optical double-sided adhesive tape having a laminated structure including a first adhesive layer, a second adhesive layer, and a transparent substrate between the first and second adhesive layers, and the transparent substrate is used as a base. Uniaxially stretched polyester substrate with a thickness of 75 μm or more in the width direction of the substrate, the Elmendorf tear strength in the width direction of the substrate is 0.5 N or less, and the Elmendorf tear strength in the mechanical direction of the substrate It is 1 N or more. 如請求項1之光學用雙面黏著帶，其中上述透明基材之厚度為150 μm以下。For example, the optical double-sided adhesive tape of claim 1, wherein the thickness of the transparent substrate is 150 μm or less. 如請求項1之光學用雙面黏著帶，其中上述透明基材之寬度方向之延伸倍率為2.5～6倍。For example, the optical double-sided adhesive tape according to claim 1, wherein the width direction extension ratio of the transparent substrate is 2.5 to 6 times. 如請求項1之光學用雙面黏著帶，其中上述第1黏著劑層之厚度為5 μm以上，且上述第2黏著劑層之厚度為5 μm以上。For example, the optical double-sided adhesive tape of claim 1, wherein the thickness of the first adhesive layer is 5 μm or more, and the thickness of the second adhesive layer is 5 μm or more. 如請求項1之光學用雙面黏著帶，其中上述第1黏著劑層及/或第2黏著劑層包含選自由丙烯酸系黏著劑、胺基甲酸酯系黏著劑、聚矽氧系黏著劑、及橡膠系黏著劑所組成之群中之至少一種。For example, the optical double-sided adhesive tape of claim 1, wherein the first adhesive layer and / or the second adhesive layer contains a material selected from the group consisting of an acrylic adhesive, a urethane adhesive, and a polysiloxane adhesive. And at least one of the group consisting of rubber-based adhesives. 如請求項1之光學用雙面黏著帶，其中上述第1黏著劑層及/或上述第2黏著劑層為活性能量線硬化型黏著劑組合物之硬化物。For example, the optical double-sided adhesive tape according to claim 1, wherein the first adhesive layer and / or the second adhesive layer are hardened products of an active energy ray-curable adhesive composition. 如請求項1之光學用雙面黏著帶，其霧度為3%以下。For example, the optical double-sided adhesive tape of claim 1 has a haze of 3% or less. 如請求項1至7中任一項之光學用雙面黏著帶，其中上述透明基材具有1500 nm以上之面內相位差。The optical double-sided adhesive tape according to any one of claims 1 to 7, wherein the transparent substrate has an in-plane phase difference of 1500 nm or more.
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