TW201819561A - Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display - Google Patents

Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display Download PDF

Info

Publication number
TW201819561A
TW201819561A TW106121235A TW106121235A TW201819561A TW 201819561 A TW201819561 A TW 201819561A TW 106121235 A TW106121235 A TW 106121235A TW 106121235 A TW106121235 A TW 106121235A TW 201819561 A TW201819561 A TW 201819561A
Authority
TW
Taiwan
Prior art keywords
adhesive layer
adhesive
adhesive sheet
thickness
meth
Prior art date
Application number
TW106121235A
Other languages
Chinese (zh)
Other versions
TWI730127B (en
Inventor
三井数馬
藤田雅人
野中崇弘
Original Assignee
日東電工股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工股份有限公司 filed Critical 日東電工股份有限公司
Publication of TW201819561A publication Critical patent/TW201819561A/en
Application granted granted Critical
Publication of TWI730127B publication Critical patent/TWI730127B/en

Links

Classifications

    • 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
    • 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
    • C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Abstract

To provide a double-sided adhesive sheet for optical use, which is suitable for increasing thickness while maintaining reliability of adhesion, and a polarizing film and a liquid crystal display device having the above adhesive sheet for optical use. An adhesive sheet X of the present invention has a layered structure including a substrate 10 and adhesive layers 11, and 12. The substrate 10 is located between the adhesive layers 11, and 12 and has a thickness of over 25 [mu]m and an average coefficient of linear expansion of 2*10<SP>-4</SP> DEG<SP>-1</SP> or less in an absolute value at 90 to 100 DEG C. A thickness TB of the substrate 10, a thickness TA1 of the adhesive layer 11, and a thickness TA2 of the adhesive layer 12 satisfy TB ≤ TA1 ≤ TA2 when TB is 25 [mu]m or more and less than 100 [mu]m, and satisfy 2.5TB ≤ TA1 ≤ TA2 when TB is equal to or larger than 100 [mu]m. The polarizing film with the adhesive layer of the present invention has a layered structure of the adhesive sheet X and a polarizing film 21. The liquid crystal display device of the present invention has a structure including the adhesive sheet X.

Description

光學用黏著片材、附黏著劑層之偏光膜及液晶顯示裝置Optical adhesive sheet, polarizing film with adhesive layer, and liquid crystal display device

本發明係關於一種具有光透過性之光學用途之雙面黏著片材、以及帶有此種光學用黏著片材之偏光膜及液晶顯示裝置。The present invention relates to a double-sided adhesive sheet for optical use having optical transparency, and a polarizing film and a liquid crystal display device having the optical adhesive sheet.

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。於該等裝置中，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氣隙，而使用具有光透過性之雙面黏著片材。關於此種光學用黏著片材，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A display device such as a liquid crystal display or an input device such as a touch panel includes a laminated structure including various substrates or films. In these devices, there are cases where a double-sided adhesive sheet having light permeability is used to join adjacent specific parts in the laminated structure or to fill an air gap between adjacent parts. Such an optical adhesive sheet 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] 關於上述之光學用黏著片材，根據使用其之顯示裝置等之設計不同，或者根據於使用其之顯示裝置等之供應鏈(supply chain)內貼合於零件之階段不同，而存在較厚者有用之情形。例如係如下述之情形。 組裝至液晶顯示器內之液晶面板大多情況下具有於其畫面之周緣帶有補強用邊框的構造，該邊框大多係以於液晶面板之厚度方向上較畫面表面更為突出之構造而設計。自各種觀點而言要求邊框本身相對於液晶面板中之畫面較細之情況下，就液晶面板之強度之觀點而言，有利的是邊框中較畫面表面更為突出之部分之突出尺寸較大。又，於液晶顯示器之供應鏈內，對由液晶面板製造業者所供給之液晶面板於例如液晶顯示器組裝階段中進行光學用黏著片材之貼合之情形時，就由液晶面板製造業者所出貨之液晶面板之強度的觀點而言，有利的是液晶面板之邊框突出尺寸較大。而且，於液晶顯示器中，液晶面板之邊框突出尺寸越大，作為填充至形成顯示器之最前面之透明罩與該液晶面板之間的光學用黏著片材，越要求與邊框突出尺寸相匹配之較厚者。 然而，於先前之技術中，關於上述般之光學用途之雙面黏著片材，存在如下傾向：越增大其厚度方向之設計尺寸，即越謀求增厚，則越難以確保對被接著體之接著可靠性。 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確保接著可靠性一面謀求增厚之光學用途之雙面黏著片材、以及帶有此種光學用黏著片材之偏光膜及液晶顯示裝置。 [解決問題之技術手段] 根據本發明之第1態樣，提供一種光學用黏著片材。該光學用黏著片材具有包含第1黏著劑層、第2黏著劑層、及位於該等第1及第2黏著劑層之間的基材之積層構造。基材係厚度超過25 μm，且90～100℃下之平均線膨脹率之絕對值為2×10-4 ℃-1 以下。關於該平均線膨脹率之絕對值，於基材為樹脂製之情形時，該基材之所謂機械方向(MD)之值與和該機械方向正交之所謂寬度方向(TD)之值大多不同之情況下，於該兩絕對值不同之情形時，將更大之值設為90～100℃下之平均線膨脹率之絕對值。又，基材之厚度TB 、第1黏著劑層之厚度TA1 、及第2黏著劑層之厚度TA2 係於TB 未達100 μm之情形時滿足TB ≦TA1 ≦TA2 ，於TB 為100 μm以上之情形時滿足2.5TB ≦TA1 ≦TA2 。本光學用黏著片材例如可以如下態樣填充至液晶顯示裝置中之形成顯示畫面之最前面之透明罩與組裝至裝置內之液晶面板之間：以第1黏著劑層之側貼附於透明罩且以第2黏著劑層之側貼附於液晶面板。具備以上構成之本光學用黏著片材係適於一面確保對被接著體之接著可靠性一面謀求增厚。其原因係如下所示。 經由光學用途之雙面黏著片材實現接合狀態之被接著體存在具有不同之材料構成之情形。例如於汽車用液晶顯示器或液晶顯示裝置中，形成顯示畫面之最前面之透明罩、與組裝至裝置內之液晶面板之積層構成上的最表層大多情況下具有不同之材料構成。透明罩例如為玻璃製罩或樹脂製罩。該透明罩存在顯示出如下特性之傾向：於自室溫開始升溫之過程中膨脹且於向室溫降溫之過程中收縮。另一方面，例如偏光膜位於液晶面板之最表層。液晶面板用途之偏光膜存在顯示出如下特性之傾向：於自室溫開始升溫之過程中收縮且於向室溫降溫之過程中膨脹，該變形特性係與透明罩之變形特性相反。此外，此種偏光膜之基於溫度變化之面擴展方向之尺寸變化相對較大。於使單一之黏著劑層承擔因具有不同之材料構成故而基於溫度變化之變形特性及其他特性不同之兩構件間的填充之情形時，存在以下傾向：該黏著劑層之厚度越增大，越難以一面對應於兩構件之特性差異一面使該單一黏著劑層同時確保對該兩構件之接著可靠性。其原因在於存在以下傾向：介於材料構成不同之兩構件間之單一黏著劑層之厚度越增大，越難以使該黏著劑層一面適當地對應於該兩構件各自之特性一面確保對各構件之充分之剪切黏著力。相對於此，本發明之第1態樣之光學用黏著片材具有包含第1黏著劑層、第2黏著劑層、及其等間之基材之積層構造，故而容易各黏著劑層一面使對應於基於其被接著體之溫度變化之變形特性及其他特性一面謀求厚膜化。於將本光學用黏著片材應用於用以填充液晶顯示裝置之透明罩與液晶面板之間的透明黏著片材之情形時，例如可使第1黏著劑層一面對應於液晶顯示裝置之透明罩之特性一面謀求厚膜化，並且使第2黏著劑層一面對應於液晶面板最表層之特性一面謀求厚膜化。如上所述，本光學用黏著片材具有包含第1黏著劑層、第2黏著劑層、及其等間之基材之積層構造的情況係適於一面使第1黏著劑層及第2黏著劑層分別柔軟地對應於各被接著體之特性一面謀求光學用黏著片材整體之增厚。 又，本光學用黏著片材所具有之基材之厚度係如上述般超過25 μm。此種構成係適於使基材確保作為本光學用黏著片材中之支持體之功能，而抑制於本光學用黏著片材之製作過程或貼合於被接著體之作業時等本光學用黏著片材產生皺褶。此種皺褶之抑制係有助於確保本光學用黏著片材對被接著體之接著可靠性。 此外，關於本光學用黏著片材所具有之基材，其於90～100℃下之平均線膨脹率之絕對值如上述般為2×10-4 ℃-1 以下。帶來以上技術效果之與基材之該低熱膨脹率有關的構成係適於抑制在該基材與第1黏著劑層之界面、或該基材與第2黏著劑層之界面產生剝離。基材與各黏著劑層之間之界面剝離之抑制係有助於確保本光學用黏著片材之接著可靠性。 另外，於本光學用黏著片材中，如上所述，基材之厚度TB 、第1黏著劑層之厚度TA1 、及第2黏著劑層之厚度TA2 係於TB 未達100 μm之情形時滿足TB ≦TA1 ≦TA2 (第1關係式)，於TB 為100 μm以上之情形時滿足2.5TB ≦TA1 ≦TA2 (第2關係式)。此種構成係適於利用黏著劑層來緩和如上述般熱膨脹率相對較小之基材中亦可能產生之收縮應力等熱應力並抑制該熱應力作用於其被接著體，而抑制於各黏著劑層與其被接著體之界面產生剝離。存在基材越厚則該基材中所產生之收縮應力等熱應力越大之傾向之情況下，於基材之厚度TB 相對較小而未達100 μm之情形時滿足上述第1關係式，且於基材之厚度TB 相對較大而為100 μm以上之情形時滿足上述第2關係式之構成係適於利用兩黏著劑層來緩和基材之熱應力，抑制該黏著劑層與被接著體之間之界面剝離。黏著劑層與被接著體之間之界面剝離之抑制係有助於確保本光學用黏著片材之接著可靠性。 如上所示，本發明之第1態樣之光學用黏著片材係適於一面確保接著可靠性一面謀求增厚。 較佳為本光學用黏著片材所具有之第1黏著劑層之厚度為450 μm以下。此種構成係於以下方面而言較佳：使第1黏著劑層一面確保於例如95℃之高溫下之充分之儲存彈性模數，一面實現對被接著體之較高之剪切黏著力。此種構成係於以下方面而言較佳：使第1黏著劑層一面確保於例如95℃之高溫下之充分之儲存彈性模數，一面實現對液晶顯示裝置用之樹脂製罩等透明罩之較高之剪切黏著力。 較佳為本光學用黏著片材所具有之第2黏著劑層之厚度為1000 μm以下。此種構成係於以下方面而言較佳：使第2黏著劑層一面確保於例如95℃之高溫下之充分之損耗正切(＝損失彈性模數/儲存彈性模數)，一面實現對被接著體之較高之剪切黏著力。此種構成係於以下方面而言較佳：使第2黏著劑層一面確保於例如95℃之高溫下之充分之損耗正切，一面實現對液晶面板之偏光膜之較高之剪切黏著力。 較佳為本光學用黏著片材所具有之基材之厚度為150 μm以下。此種構成係適於藉由抑制本光學用黏著片材之剛性變得過大而確保所謂階差追隨性，於被接著體表面存在階差之情形抑制產生由該階差引起之缺陷。例如對於液晶顯示裝置用途之透明罩之液晶面板側表面，大多沿著罩周緣而實施印刷。該印刷具有特定之厚度，而使透明罩之液晶面板側表面產生階差。該印刷階差於在透明罩之液晶面板側表面貼附有黏著片材之情形時，可能成為產生該黏著片材之局部隆起等缺陷之原因。本光學用黏著片材中基材之厚度為150 μm以下之構成係適於藉由抑制本光學用黏著片材之剛性變得過大，而於例如本光學用黏著片材貼附於液晶顯示裝置用途之透明罩之狀態下，確保本光學用黏著片材階差追隨性，從而抑制因透明罩表面之印刷階差而產生該黏著片材之局部隆起等缺陷。 較佳為第1黏著劑層及/或第2黏著劑層含有丙烯酸系黏著劑作為主劑。此種構成係於實現光學用黏著片材之黏著劑層所要求之程度之黏著力的方面而言較佳。 較佳為第1黏著劑層及/或第2黏著劑層係活性能量線硬化型黏著劑組合物之硬化物。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，第1黏著劑層為活性能量線硬化型黏著劑組合物之硬化物之構成係於實現即便相對較厚亦充分硬化之第1黏著劑層的方面而言較佳。又，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之構成係於實現即便相對較厚亦充分硬化之第2黏著劑層的方面而言較佳。 較佳為本光學用黏著片材係其厚度方向之霧度為5%以下。此種構成係對於要求透明性之光學用黏著片材而言較佳。 較佳為本光學用黏著片材所具有之基材具有1500 nm以上之面內相位差。本發明中，所謂基材之面內相位差，係指與使波長590 nm之光於23℃下透過基材時之雙折射有關的於平行於基材主面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，且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，將基材之厚度設為d(nm)之情形時，設為由(nx－ny)×d所表示之值。於本光學用黏著片材中基材具有1500 nm以上之面內相位差之構成係適於在液晶顯示裝置中之透明罩與液晶面板之間填充有本光學用黏著片材之情形時，例如抑制於經由偏光太陽眼鏡等帶偏光功能之透鏡視認該裝置之顯示畫面時產生所謂消隱(black out)現象。 根據本發明之第2態樣，提供一種附黏著劑層之偏光膜。該偏光膜具有本發明之第1態樣之光學用黏著片材與偏光膜之積層構造。根據此種構成，可提供一種已貼合有適於一面確保接著可靠性一面謀求增厚之光學用黏著片材之液晶面板用偏光膜。 根據本發明之第3態樣，提供一種液晶顯示裝置。該液晶顯示裝置包含本發明之第1態樣之光學用黏著片材。液晶顯示裝置例如包含透明罩、液晶面板、及位於其等間之上述第1態樣之光學用黏著片材的積層構造部。光學用黏著片材係例如係以第1黏著劑層之側貼附於透明罩，且以第2黏著劑層之側貼附於液晶面板。根據此種構成，可使填充透明罩與液晶膜之間之光學用黏著片材享有上文中關於本發明之第1態樣所描述之技術效果。[Problems to be Solved by the Invention] The above-mentioned optical adhesive sheet is different in design according to a display device or the like, or is attached to a component in a supply chain of the display device or the like in which it is used. The stages are different and there are situations where the thicker is useful. For example, it is as follows. In most cases, a liquid crystal panel assembled into a liquid crystal display has a structure with a reinforcing frame on the periphery of the screen, and the frame is mostly designed with a structure that is more prominent than the screen surface in the thickness direction of the liquid crystal panel. When it is required from various viewpoints that the bezel itself is thinner than the screen in the liquid crystal panel, from the viewpoint of the strength of the liquid crystal panel, it is advantageous that the protruding size of the portion of the bezel that is more prominent than the screen surface is larger. In addition, in the supply chain of a liquid crystal display, when the liquid crystal panel supplied by the liquid crystal panel manufacturer is bonded to the optical adhesive sheet in the liquid crystal display assembly stage, for example, the liquid crystal panel manufacturer is shipped. From the viewpoint of the strength of the liquid crystal panel, it is advantageous that the bezel size of the liquid crystal panel is large. Moreover, in a liquid crystal display, the larger the protruding size of the bezel of the liquid crystal panel is, the more it is required to match the protruding size of the bezel as an optical adhesive sheet filled between the transparent cover forming the forefront of the display and the liquid crystal panel. Thick person. However, in the prior art, as for the above-mentioned double-sided adhesive sheet for optical applications, there is a tendency that the larger the design size in the thickness direction, that is, the thicker it is, the more difficult it is to ensure the adhesion Then reliability. The present invention has been conceived based on the above-mentioned circumstances, and an object thereof is to provide a double-sided adhesive sheet suitable for optical use that seeks to increase the thickness while ensuring reliability, and a polarized light having the optical adhesive sheet Film and liquid crystal display device. [Technical Solution to Problem] According to a first aspect of the present invention, an optical adhesive sheet is provided. This optical adhesive sheet has a laminated structure including a first adhesive layer, a second adhesive layer, and a substrate located between the first and second adhesive layers. The thickness of the substrate is more than 25 μm, and the absolute value of the average linear expansion coefficient at 90 to 100 ° C is 2 × 10 -4 ° C -1 or less. Regarding the absolute value of the average linear expansion ratio, when the substrate is made of resin, the value of the so-called mechanical direction (MD) of the substrate is often different from the value of the so-called width direction (TD) orthogonal to the mechanical direction. In this case, when the two absolute values are different, a larger value is set to the absolute value of the average linear expansion ratio at 90 to 100 ° C. The thickness T B of the substrate, the thickness T A1 of the first adhesive layer, and the thickness T A2 of the second adhesive layer satisfy T B ≦ T A1 ≦ T A2 when T B is less than 100 μm, When T B is 100 μm or more, 2.5T B ≦ T A1 ≦ T A2 is satisfied. The optical adhesive sheet can be filled, for example, between a transparent cover forming the front of a display screen in a liquid crystal display device and a liquid crystal panel assembled in the device as follows: the first adhesive layer is attached to the transparent side The cover is attached to the liquid crystal panel with the side of the second adhesive layer. The present optical adhesive sheet having the above configuration is suitable for increasing the thickness while ensuring the bonding reliability to the adherend. The reason is as follows. There may be cases in which the adhered state of the bonded state through the double-sided adhesive sheet for optical use has a different material composition. For example, in an automotive liquid crystal display or a liquid crystal display device, the outermost surface layer on the laminated structure constituting the forefront of the display screen and the liquid crystal panel assembled into the device often has different material compositions. The transparent cover is, for example, a glass cover or a resin cover. The transparent cover tends to exhibit the following characteristics: it expands during the temperature increase from room temperature, and shrinks during the temperature decrease to room temperature. On the other hand, for example, a polarizing film is located on the outermost layer of a liquid crystal panel. The polarizing film for liquid crystal panel applications tends to show the following characteristics: shrinkage during the temperature rise from room temperature and expansion during the temperature decrease to room temperature. This deformation characteristic is opposite to that of the transparent cover. In addition, such a polarizing film has a relatively large dimensional change in the direction of plane expansion based on temperature changes. In the case where a single adhesive layer is responsible for filling between two members having different deformation characteristics due to temperature changes and other characteristics due to different material compositions, there is a tendency that the larger the thickness of the adhesive layer, the more the It is difficult to make the single adhesive layer simultaneously ensure the reliability of adhesion to the two members while corresponding to the difference in characteristics of the two members. The reason is that there is a tendency that the larger the thickness of a single adhesive layer between two members with different material constitutions, the more difficult it is to make the side of the adhesive layer appropriately correspond to the respective characteristics of the two members and ensure that Full shear adhesion. In contrast, the optical adhesive sheet according to the first aspect of the present invention has a laminated structure including a first adhesive layer, a second adhesive layer, and a substrate therebetween, so that it is easy to use each adhesive layer on one side. The thickness is increased in accordance with the deformation characteristics and other characteristics based on the temperature change of the adherend. When the optical adhesive sheet is applied to a transparent adhesive sheet between a transparent cover for filling a liquid crystal display device and a liquid crystal panel, for example, one side of the first adhesive layer may correspond to the transparent cover of the liquid crystal display device. The characteristics are sought to be thicker, and the second adhesive layer is required to be thicker while corresponding to the characteristics of the outermost layer of the liquid crystal panel. As described above, when the optical adhesive sheet has a laminated structure including a first adhesive layer, a second adhesive layer, and a base material therebetween, it is suitable to make the first adhesive layer and the second adhesive on one side. The thickness of the entire adhesive sheet for optics is required to increase the thickness of the adhesive layer in accordance with the characteristics of each adherend. The thickness of the base material included in the optical adhesive sheet is more than 25 μm as described above. Such a structure is suitable for ensuring that the substrate functions as a support in the optical adhesive sheet, and suppressing the optical adhesive sheet in the production process of the optical adhesive sheet or the operation of bonding to the adherend, and the like. Wrinkling of the adhered sheet. Such a wrinkle suppression system helps to ensure the adhesion reliability of the present optical adhesive sheet to an adherend. The absolute value of the average linear expansion coefficient at 90 to 100 ° C of the base material included in the optical adhesive sheet is 2 × 10 -4 ° C -1 or less as described above. The structure related to the low thermal expansion coefficient of the base material that brings the above technical effects is suitable to suppress peeling at the interface between the base material and the first adhesive layer, or the interface between the base material and the second adhesive layer. The suppression of interfacial peeling between the substrate and each adhesive layer helps to ensure the bonding reliability of the optical adhesive sheet. In addition, in this adhesive sheet for optics, as described above, the thickness T B of the substrate, the thickness T A1 of the first adhesive layer, and the thickness T A2 of the second adhesive layer are less than 100 μm in T B. In the case, T B ≦ T A1 ≦ T A2 (first relational expression) is satisfied, and when T B is 100 μm or more, 2.5T B ≦ T A1 ≦ T A2 (second relational expression) is satisfied. Such a structure is suitable for using an adhesive layer to alleviate thermal stress such as shrinkage stress that may also occur in a substrate having a relatively small thermal expansion coefficient as described above, and to suppress the thermal stress from acting on its adherend, and to suppress adhesion. Delamination occurs at the interface between the agent layer and its adherend. In the case where the thicker the substrate, the larger the thermal stress such as the shrinkage stress generated in the substrate, the larger the thickness T B of the substrate is, but less than 100 μm. In addition, when the thickness T B of the substrate is relatively large and is 100 μm or more, the structure satisfying the second relationship is suitable for using two adhesive layers to relax the thermal stress of the substrate and suppress the adhesive layer and the The interface between the adherends is peeled. The suppression of the peeling of the interface between the adhesive layer and the adherend helps to ensure the bonding reliability of the optical adhesive sheet. As described above, the optical adhesive sheet according to the first aspect of the present invention is suitable for increasing the thickness while ensuring the reliability. The thickness of the first adhesive layer included in the optical adhesive sheet is preferably 450 μm or less. Such a structure is preferable in that the first adhesive layer has a high shear adhesive force to the adherend while ensuring sufficient storage elastic modulus at a high temperature of, for example, 95 ° C. Such a structure is preferable in that the first adhesive layer is provided with a sufficient storage elastic modulus at a high temperature of, for example, 95 ° C, and a transparent cover such as a resin cover for a liquid crystal display device is realized. Higher shear adhesion. The thickness of the second adhesive layer included in the optical adhesive sheet is preferably 1000 μm or less. Such a structure is preferable in that the second adhesive layer is ensured to have a sufficient loss tangent (= loss elastic modulus / storage elastic modulus) at a high temperature of 95 ° C, for example, while being bonded. Higher shear adhesion of the body. Such a structure is preferable in that the second adhesive layer has a high shear adhesion to the polarizing film of the liquid crystal panel while ensuring a sufficient loss tangent at a high temperature of, for example, 95 ° C. The thickness of the base material included in the optical adhesive sheet is preferably 150 μm or less. Such a configuration is suitable for ensuring the so-called step-followability by suppressing the rigidity of the optical adhesive sheet from becoming too large, and suppressing the occurrence of defects caused by the step when there is a step on the surface of the adherend. For example, the liquid crystal panel side surface of a transparent cover used for a liquid crystal display device is often printed along the periphery of the cover. The printing has a specific thickness, which causes a step difference on the side surface of the liquid crystal panel of the transparent cover. This printing step is worse than when an adhesive sheet is attached to the side surface of the liquid crystal panel of the transparent cover, which may cause defects such as local bulging of the adhesive sheet. The optical adhesive sheet has a thickness of 150 μm or less, and is suitable for suppressing the rigidity of the optical adhesive sheet from becoming too large. For example, the optical adhesive sheet is attached to a liquid crystal display device. In the state of the transparent cover of the application, the followability of the step of the optical adhesive sheet is ensured, and defects such as local bulging of the adhesive sheet due to the printing step on the surface of the transparent cover are suppressed. The first adhesive layer and / or the second adhesive layer preferably contain an acrylic adhesive as a main agent. Such a configuration is preferable in terms of achieving the degree of adhesion required for the adhesive layer of the optical adhesive sheet. The first adhesive layer and / or the second adhesive layer are preferably hardened products of an active energy ray-curable adhesive composition. 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, it is preferable that the first adhesive layer is a hardened product of the active energy ray-curable adhesive composition in terms of realizing the first adhesive layer that is sufficiently hardened even if it is relatively thick. In addition, the second adhesive layer is preferably a hardened product of an active energy ray-curable adhesive composition in terms of achieving a second adhesive layer that is sufficiently hardened even when relatively thick. It is preferable that the haze in the thickness direction of the optical adhesive sheet is 5% or less. Such a structure is preferable for an optical adhesive sheet which requires transparency. It is preferable that the substrate included in the optical adhesive sheet has an in-plane retardation of 1500 nm or more. In the present invention, the in-plane phase difference of a substrate refers to two optical lines that are parallel to a plane parallel to the principal surface of the substrate and related to the birefringence when light with a wavelength of 590 nm passes through the substrate at 23 ° C. The phase difference between the polarized light component (abnormal light) vibrating in the direction of the slow axis and the polarized light component (normal light) vibrating in the direction of the forward axis in the main axis (late phase axis and advanced phase axis), When 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 when the thickness of the substrate is set to d (nm), it is set to (nx -Ny) × d. The configuration of the substrate having an in-plane retardation of 1500 nm or more in the optical adhesive sheet is suitable when the optical adhesive sheet is filled between a transparent cover and a liquid crystal panel in a liquid crystal display device, for example, The so-called black out phenomenon is suppressed when a display screen of the device is viewed through a lens with a polarizing function such as polarized sunglasses. According to a second aspect of the present invention, a polarizing film with an adhesive layer is provided. This polarizing film has a laminated structure of the optical adhesive sheet and the polarizing film according to the first aspect of the present invention. According to such a configuration, it is possible to provide a polarizing film for a liquid crystal panel, to which an adhesive sheet for optics suitable for thickening is secured while ensuring reliability. According to a third aspect of the present invention, a liquid crystal display device is provided. This liquid crystal display device includes the optical adhesive sheet according to the first aspect of the present invention. The liquid crystal display device includes, for example, a transparent cover, a liquid crystal panel, and a laminated structure portion of the above-mentioned first aspect of the optical adhesive sheet. The optical adhesive sheet is, for example, attached to the transparent cover with the side of the first adhesive layer, and attached to the liquid crystal panel with the side of the second adhesive layer. With this configuration, the optical adhesive sheet filled between the transparent cover and the liquid crystal film can enjoy the technical effects described in the first aspect of the present invention.

圖1係作為本發明之一實施形態之光學用黏著片材之黏著片材X的局部剖視圖。黏著片材X係具有包含基材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。黏著片材X可於例如透明罩與液晶面板接近並對向之設計之液晶顯示裝置中，用作用以填充透明罩與液晶面板之間的透明之光學用黏著片材。具體而言，黏著片材X可於上述般之設計之液晶顯示裝置中，以如下態樣用作用以填充該等透明罩與液晶面板之間的透明之光學用黏著片材：以黏著劑層11側貼附於透明罩且以黏著劑層12側貼附於液晶面板之透明罩側最表層。液晶面板中，包括將觸控面板功能組入至液晶面板中的附帶表嵌式觸控感測器之液晶面板或附帶內嵌式觸控感測器之液晶面板。關於此種觸控面板內置型之液晶面板，作為用以實現所謂液晶快門功能之液晶面板之一要素的偏光膜於該面板之積層構成上大多位於最表層。 黏著片材X之基材10係於黏著片材X中作為支持體而發揮功能之部位，且具有光透過性。基材10之厚度超過25 μm，較佳為30 μm以上，更佳為40 μm以上，更佳為50 μm以上，更佳為60 μm以上，更佳為70 μm以上，更佳為80 μm以上。另一方面，基材10之厚度較佳為150 μm以下。而且，基材10之厚度TB 、黏著劑層11之厚度TA1 、及黏著劑層12之厚度TA2 係於TB 未達100 μm之情形時，滿足TB ≦TA1 ≦TA2 ，較佳為滿足1.2TB ≦TA1 ≦TA2 ，更佳為滿足1.5TB ≦TA1 ≦TA2 ，更佳為滿足2TB ≦TA1 ≦TA2 。又，基材10之厚度TB 、黏著劑層11之厚度TA1 、及黏著劑層12之厚度TA2 係於TB 為100 μm以上之情形時，滿足2.5TB ≦TA1 ≦TA2 ，較佳為滿足2.7TB ≦TA1 ≦TA2 ，更佳為滿足3TB ≦TA1 ≦TA2 ，更佳為滿足3.5TB ≦TA1 ≦TA2 ，更佳為滿足4TB ≦TA1 ≦TA2 。 關於基材10，其於90～100℃下之平均線膨脹率之絕對值為2×10-4 ℃-1 以下，較佳為1.5×10-4 ℃-1 以下，更佳為1×10-4 ℃-1 以下。關於該平均線膨脹率之絕對值，於基材10為樹脂製之情形時，基材10之所謂機械方向(MD)之值與和該機械方向正交之所謂寬度方向(TD)之值大多不同之情況下，於該兩絕對值不同之情形時，將更大之值設為90～100℃下之平均線膨脹率之絕對值。關於90～100℃下之平均線膨脹率，例如可基於使用熱機械分析裝置(商品名「TMA/SS6000」，精工電子奈米科技公司(SII Nanotechnology)製造)進行之線膨脹測定而求出。於本測定中，將例如裝置所具備之一對夾頭所夾持之測定試樣之初始夾頭間距離(測定之初始長度)設為10 mm，將測定氛圍設為空氣氛圍(流量200 ml/分鐘)，將測定模式設為拉伸模式(負荷19.6 mN)，將測定溫度範圍設為自20℃至350℃，將升溫速度設為例如5℃/分鐘。 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平行於基材10之主面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。 作為用以形成如以上之基材10之材料，例如可列舉：聚對苯二甲酸乙二酯(PET)等聚酯、聚丙烯或聚乙烯等聚烯烴、聚碳酸酯、聚醯胺、聚醯亞胺、丙烯酸樹脂、聚苯乙烯、乙酸酯、聚醚碸、及三乙醯纖維素。基材10可包含一種材料，亦可包含兩種以上之材料。基材10亦可具有多層構造。又，基材10中之黏著劑層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。帶有如上述之面內相位差之基材10例如包含實施單軸延伸處理或雙軸延伸處理至特定程度之樹脂膜。 黏著片材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。作為黏著劑層11、12所含之黏著劑，例如可列舉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、及聚矽氧系黏著劑。於實現光學用黏著片材X之黏著劑層11、12所要求之程度之黏著力的方面而言，較佳為採用丙烯酸系聚合物作為黏著劑。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之比率較佳為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之方面而言較佳。 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 f×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2.0g/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3-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 LΑ-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 LΑ-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 LΑ-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亦可分別視需要而於不損及本發明之效果之範圍內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，就使黏著劑層11一面確保於例如95℃之高溫下之充分之儲存彈性模數(剪切儲存彈性模數)一面實現對被接著體之較高之剪切黏著力的觀點而言，較佳為450 μm以下，更佳為400 μm以下，更佳為300 μm以下。 關於黏著劑層12之厚度，就使黏著劑層12一面確保於例如95℃之高溫下之充分之損耗正切(＝損失彈性模數/儲存彈性模數)一面實現對被接著體之較高之剪切黏著力的觀點而言，較佳為1000 μm以下，更佳為950 μm以下，更佳為900 μm以下。又，就使黏著片材X增厚之觀點而言，黏著劑層12之厚度較佳為大於黏著劑層11之厚度。 關於以上般之構成之光學用黏著片材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。又，光學用之黏著片材X之霧度較佳為5%以下，更佳為4%以下，更佳為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。 黏著片材X亦可以將黏著劑層11之黏著面11a被覆之方式設有隔離膜(剝離襯墊)。黏著片材X亦可以將黏著劑層12之黏著面12a被覆之方式設有隔離膜(剝離襯墊)。隔離膜係用以進行保護以使黏著片材X之黏著劑層11、12不露出之要素，且係於將黏著片材X貼合於被接著體時自黏著片材X剝離。作為隔離膜，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。隔離膜之表面亦可實施脫模處理、防污處理、或抗靜電處理。隔離膜之厚度例如為5～200 μm。 以上般之構成之黏著片材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而進行製造。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，較佳為使用藉由活性能量線之照射進行聚合反應而可硬化之黏著劑組合物。即，黏著劑層11及/或黏著劑層12較佳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之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實現黏著劑層之硬化的活性能量線，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係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係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，例如可列舉過氧化二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上述黏著片材X係適於一面確保對被接著體之接著可靠性一面謀求增厚。其原因係如下所示。 經由光學用途之雙面黏著片材實現接合狀態之被接著體存在具有不同之材料構成之情形。例如於汽車用液晶顯示器或液晶顯示裝置中，形成顯示畫面之最前面之透明罩、與組裝至裝置內之液晶面板之積層構成上的最表層大多情況下具有不同之材料構成。透明罩例如為玻璃製罩或樹脂製罩。該透明罩存在顯示出如下特性之傾向：於自室溫開始升溫之過程中膨脹且於向室溫降溫之過程中收縮。另一方面，例如偏光膜位於液晶面板之最表層。液晶面板用途之偏光膜存在顯示出如下特性之傾向：於自室溫開始升溫之過程中收縮且於向室溫降溫之過程中膨脹，該變形特性係與透明罩之變形特性相反。此外，此種偏光膜之基於溫度變化之面擴張方向之尺寸變化相對較大。於使單一之黏著劑層承擔因具有不同之材料構成故而基於溫度變化之變形特性及其他特性不同之兩構件間的填充之情形時，存在以下傾向：該黏著劑層之厚度越增大，越難以一面對應於兩構件之特性差異一面使該單一之黏著劑層同時確保對兩構件之接著可靠性。其原因在於存在以下傾向：介於材料構成不同之兩構件間之單一黏著劑層之厚度越增大，越難以使該黏著劑層一面適當地對應於該兩構件各自之特性一面確保對各構件之充分之剪切黏著力。相對於此，黏著片材X具有包含黏著劑層11、黏著劑層12、及其等間之基材10之積層構造，故而容易一面使各黏著劑層對應於基於其被接著體之溫度變化之變形特性及其他特性一面謀求厚膜化。於將黏著片材X應用於用以填充液晶顯示裝置之透明罩與液晶面板之間的透明黏著片材之情形時，例如可使黏著劑層11一面對應於液晶顯示裝置之透明罩之特性一面謀求厚膜化，且使黏著劑層12一面對應於液晶面板最表層之特性一面謀求厚膜化。如上所示，黏著片材X具有包含黏著劑層11、黏著劑層12、及其等間之基材10之積層構造之情況係適於一面使黏著劑層11及黏著劑層12分別柔軟地對應於各自之被接著體之特性一面謀求黏著片材X整體之增厚。 又，黏著片材X所具有之基材10之厚度如上述般超過25 μm，較佳為30 μm以上，更佳為40 μm以上，更佳為50 μm以上，更佳為60 μm以上，更佳為70 μm以上，更佳為80 μm以上。此種構成係適於使基材10確保作為黏著片材X中之支持體之功能，而抑制於黏著片材X之製作過程或貼合於被接著體之作業時等黏著片材X產生皺褶。此種皺褶之抑制係有助於確保黏著片材X對被接著體之接著可靠性。 此外，關於黏著片材X所具有之基材10，其於90～100℃下之平均線膨脹率之絕對值如上述般為2×10-4 ℃-1 以下，較佳為1.5×10-4 ℃-1 以下，更佳為1×10-4 ℃-1 以下。帶來上述技術效果之與基材10之該低熱膨脹率有關的構成係適於抑制在該基材10與黏著劑層11之界面、或該基材10與黏著劑層12之界面產生剝離。基材10與各黏著劑層之間之界面剝離之抑制係有助於確保黏著片材X之接著可靠性。 另外，於黏著片材X中，基材10之厚度TB 、黏著劑層11之厚度TA1 、及黏著劑層12之厚度TA2 係如上述般於TB 未達100 μm之情形時滿足TB ≦TA1 ≦TA2 ，較佳為滿足1.2TB ≦TA1 ≦TA2 ，更佳為滿足1.5TB ≦TA1 ≦TA2 ，更佳為滿足2TB ≦TA1 ≦TA2 ，於TB 為100 μm以上之情形時滿足2.5TB ≦TA1 ≦TA2 ，較佳為滿足2.7TB ≦TA1 ≦TA2 ，更佳為滿足3TB ≦TA1 ≦TA2 ，更佳為滿足3.5TB ≦TA1 ≦TA2 ，更佳為滿足4TB ≦TA1 ≦TA2 。此種構成係適於利用黏著劑層來緩和如上述般熱膨脹率相對較小之基材10中亦可能產生之收縮應力等熱應力並抑制該熱應力作用於其被接著體，而抑制於各黏著劑層與其被接著體之界面產生剝離。黏著劑層11與其被接著體之間之界面剝離之抑制、及黏著劑層12與其被接著體之間之界面剝離之抑制係有助於確保黏著片材X之接著可靠性。 如上所述，黏著片材X係適於一面確保接著可靠性一面謀求增厚。 於此種黏著片材X中，基材10之厚度如上述般較佳為150 μm以下。此種構成係適於藉由抑制黏著片材X之剛性變得過大而確保所謂階差追隨性，於被接著體表面存在階差之情形時抑制產生由該階差引起之缺陷。例如對於液晶顯示裝置用途之透明罩之液晶面板側表面，大多沿著罩周緣而實施印刷。該印刷具有特定之厚度，而使透明罩之液晶面板側表面產生階差。該印刷階差於在透明罩之液晶面板側表面貼附有黏著片材之情形時，可能成為產生該黏著片材之局部隆起等缺陷之原因。黏著片材X中基材10之厚度為150 μm以下之構成係適於藉由抑制黏著片材X之剛性變得過大，而於例如黏著片材X貼附於液晶顯示裝置用途之透明罩之狀態下，確保黏著片材X之階差追隨性，從而抑制因透明罩表面之印刷階差而產生黏著片材X之局部隆起等缺陷。 於黏著片材X中，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。此種構成係適於在液晶顯示裝置中之透明罩與液晶面板之間填充有黏著片材X之情形時，抑制經由例如偏光太陽眼鏡等帶偏光功能之透鏡視認該裝置之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，於在液晶顯示裝置中之透明罩與液晶面板之間填充有黏著片材X之情形時，例如經由偏光太陽眼鏡等帶偏光功能之透鏡視認該裝置之顯示畫面時之所謂顏色不均現象越得到抑制。 黏著劑層11之厚度如上述般較佳為450 μm以下，更佳為400 μm以下，更佳為300 μm以下。此種構成係於以下方面而言較佳：使黏著劑層11一面確保於例如95℃之高溫下之充分之儲存彈性模數(剪切儲存彈性模數)一面實現對被接著體之較高之剪切黏著力。關於黏著劑層11，其於95℃下之儲存彈性模數例如為1.0×104 Pa以上，較佳為5.0×104 Pa以上，更佳為1.0×105 Pa以上。液晶顯示裝置用途之聚碳酸酯製罩等透明樹脂製罩存在於高溫環境下產生所謂釋氣之情形，該情況下，黏著劑層11於95℃下之高溫之儲存彈性模數例如為1.0×104 Pa以上且越高，則越容易於黏著片材X以黏著劑層11側貼附於樹脂製罩之狀態下，抑制因自樹脂製罩之釋氣而產生黏著劑層11或黏著片材X之局部隆起或剝離等缺陷。黏著劑層11之該儲存彈性模數之調整可藉由以下方式進行：用以形成黏著劑層中之丙烯酸系聚合物之各種單體之比率的調整；或黏著劑層形成用之黏著劑組合物中之共聚合性之多官能(甲基)丙烯酸酯之含量的調整；用以將所形成之丙烯酸系聚合物間交聯之交聯劑於上述組合物中之含量的調整；聚合時之黏著劑組合物層或黏著劑層之厚度設定等。關於儲存彈性模數，例如可基於使用動態黏彈性測定裝置(商品名「ARES」，Rheometrics公司製造)之動態黏彈性測定而求出。於本測定中，將測定模式設為剪切模式，將測定溫度範圍設為例如-70℃～150℃，將升溫速度設為例如5℃/分鐘，將頻率設為例如1 Hz。 黏著劑層12之厚度如上述般較佳為1000 μm以下，更佳為950 μm以下，更佳為900 μm以下。此種構成係於以下方面而言較佳：使黏著劑層12一面確保於例如95℃之高溫下之充分之損耗正切(＝損失彈性模數/儲存彈性模數)一面實現對被接著體之較高之剪切黏著力。關於黏著劑層12，其於95℃下之損耗正切例如為0.08以上，較佳為0.1以上，更佳為0.12以上，更佳為0.15以上。關於液晶面板用途之偏光膜，於存在顯示出於自室溫開始升溫之過程中收縮且於向室溫降溫之過程中膨脹的特性之傾向且該尺寸變化相對較大之情況下，黏著劑層12之損耗正切例如為0.08以上且越高，則越適於以下情況：在黏著片材X以黏著劑層12側貼附於液晶面板之偏光膜之狀態下，黏著劑層12或黏著片材X追隨於基於溫度變化之偏光膜之面擴展方向之尺寸變化，而緩和偏光膜與黏著劑層12之接著界面之應力。偏光膜與黏著劑層12之接著界面之此種應力緩和係有助於確保黏著劑層12或黏著片材X對偏光膜之接著可靠性。黏著劑層12之該損耗正切之調整可藉由以下方式進行：用以形成黏著劑層中之丙烯酸系聚合物之各種單體之比率的調整；或黏著劑層形成用之黏著劑組合物中之共聚合性之多官能(甲基)丙烯酸酯之含量的調整；用以將所形成之丙烯酸系聚合物間交聯之交聯劑於上述組合物中之含量的調整；聚合時之黏著劑組合物層或黏著劑層之厚度設定等。關於損耗正切，例如可根據使用動態黏彈性測定裝置(商品名「ARES」，Rheometrics公司製造)之動態黏彈性測定而求出。於本測定中，將測定模式設為剪切模式，將測定溫度範圍設為例如-70℃～150℃，將升溫速度設為例如5℃/分鐘，將頻率設為例如1 Hz。 圖2係本發明之一實施形態之附黏著劑層之偏光膜Y之局部剖視圖。附黏著劑層之偏光膜Y具有包含偏光膜21及黏著片材X之積層構造。偏光膜21係液晶面板用途之偏光膜，且例如係於偏光元件之單面或雙面設有透明保護膜者。偏光膜21之厚度例如為30～300 μm。黏著片材X如圖1所示般具有包含基材10及黏著劑層11、12之積層構造之情況下，以黏著劑層12(第2黏著劑層)之側貼合於偏光膜21。於黏著片材X中之與偏光膜21相反之側，亦可以被覆黏著劑層11之黏著面11a之方式設有隔離膜(剝離襯墊)。附黏著劑層之偏光膜Y係提供一種已貼合有可享有上述技術效果的光學用黏著片材X之液晶面板用偏光膜。 圖3係本發明之一實施形態之液晶顯示裝置Z中之局部積層構成圖。液晶顯示裝置Z具有包含液晶面板30、透明罩41、及其等間之黏著片材X之積層構造部。 液晶面板30係以如下方式構成：具有包含附透明電極之玻璃基板31、附透明電極之玻璃基板32、位於其等間之液晶層33、及偏光膜34、35之積層構造，並作為所謂液晶快門而發揮功能。玻璃基板31係於液晶層33之側具有像素電極作為透明電極。玻璃基板32係於液晶層33之側具有對向電極作為透明電極。偏光膜34係設置於玻璃基板31之側，且於液晶面板30之積層方向上位於一端。偏光膜35係設置於玻璃基板32之側，且於液晶面板30之積層方向上位於最靠近透明罩41側之端部。偏光膜34、35分別為液晶面板用途之偏光膜，且係於例如偏光元件之單面或雙面設有透明保護膜者。偏光膜34、35之厚度分別為例如30～300 μm。 液晶面板30較佳為具備表嵌式觸控感測器或內嵌式觸控感測器。所謂液晶面板30中之表嵌式觸控感測器(圖示省略)，係用以實現觸控面板功能之觸控感測器，但例如設置於玻璃基板32中之與液晶層33相反之側。所謂液晶面板30中之內嵌式觸控感測器(圖示省略)，係用以實現觸控面板功能之觸控感測器，但例如設置於玻璃基板31中之液晶層33之側。將觸控面板功能組入至液晶面板30中的附表嵌式觸控感測器之液晶面板或附內嵌式觸控感測器之液晶面板係於使兼具觸控面板功能與液晶快門功能之單元整體減小厚度、或重量、製造成本的方面而言較佳。 透明罩41係液晶顯示裝置用途之透明罩，且形成液晶顯示裝置Z之顯示畫面之最前面。作為透明罩41，例如可列舉透明之樹脂製罩及透明之玻璃製罩。作為該樹脂製罩，可列舉聚碳酸酯製罩或聚甲基丙烯酸甲酯製罩。就安全性或輕量性之觀點而言，樹脂製之透明罩優於玻璃製之透明罩。尤其於汽車用之液晶顯示裝置中，對此種安全性及輕量性之要求較強。 黏著片材X於如圖1所示般具有包含基材10及黏著劑層11、12之積層構造之情況下，於液晶顯示裝置Z中，以黏著劑層11(第1黏著劑層)之側貼附於透明罩41，且以黏著劑層12(第2黏著劑層)之側貼附於液晶面板30之偏光膜35。關於液晶顯示裝置Z中之偏光膜35與黏著片材X之積層構造部分，亦可藉由上述附黏著劑層之偏光膜Y而提供。 於以上般之構成之液晶顯示裝置Z中，填充液晶面板30之偏光膜35與透明罩41之間的光學用黏著片材X可享有上文中關於該黏著片材X而描述之技術效果。 [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。 [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，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50 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而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。 ＜光學用黏著片材之製作＞ 準備對厚度38 μm之聚對苯二甲酸乙二酯膜(商品名「DIAFOIL T100C38」，面內相位差1500，三菱樹脂股份有限公司製造)之兩面實施電暈處理所得者(膜F1 )，自上述積層體L1(剝離襯墊/第1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50 μm)/膜F1 (厚度38 μm)/第2黏著劑層(厚度500 μm)/剝離襯墊]之積層構成之光學用黏著片材。除剝離襯墊之厚度外的實施例1之光學用黏著片材之厚度為588 μm。又，實施例1之光學用黏著片材中，相對於基材之厚度(TB )38 μm(＜100 μm)，第1黏著劑層之厚度(TA1 )為1.3倍，第2黏著劑層之厚度(TA2 )為13.2倍。 [實施例2] 將第1黏著劑層之厚度設為100 μm而代替50 μm，以及使用對厚度50 μm之聚對苯二甲酸乙二酯膜(商品名「DIAFOIL T100E50」，面內相位差2000，三菱樹脂股份有限公司製造)之兩面實施電暈處理所得者(膜F2 )代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作實施例2之光學用黏著片材。除剝離襯墊之厚度外的實施例2之光學用黏著片材之厚度為650 μm。又，於實施例2之光學用黏著片材中，相對於基材之厚度(TB )50 μm(＜100 μm)，第1黏著劑層之厚度(TA1 )為2倍，第2黏著劑層之厚度(TA2 )為10倍。 [實施例3] 將第1黏著劑層之厚度設為250 μm而代替50 μm，以及使用上述膜F2 代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作實施例3之光學用黏著片材。除剝離襯墊之厚度外的實施例3之光學用黏著片材之厚度為800 μm。又，於實施例3之光學用黏著片材中，相對於基材之厚度(TB )50 μm(＜100 μm)，第1黏著劑層之厚度(TA1 )為5倍，第2黏著劑層之厚度(TA2 )為10倍。 [實施例4] 將第1黏著劑層之厚度設為500 μm而代替50 μm，以及使用上述膜F2 代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作實施例4之光學用黏著片材。除剝離襯墊之厚度外的實施例2之光學用黏著片材之厚度為1050 μm。又，於實施例4之光學用黏著片材中，相對於基材之厚度(TB )50 μm(＜100 μm)，第1黏著劑層之厚度(TA1 )為10倍，第2黏著劑層之厚度(TA2 )為10倍。 [實施例5] 將第1黏著劑層之厚度設為500 μm而代替50 μm，以及使用對厚度125 μm之聚對苯二甲酸乙二酯膜(商品名「DIAFOIL T104E125」，面內相位差5000，三菱樹脂股份有限公司製造)之兩面實施電暈處理所得者(膜F3 )代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作實施例5之光學用黏著片材。除剝離襯墊之厚度外的實施例2之光學用黏著片材之厚度為1125 μm。又，於實施例5之光學用黏著片材中，相對於基材之厚度(TB )125 μm(≧100 μm)，第1黏著劑層之厚度(TA1 )為4倍，第2黏著劑層之厚度(TA2 )為4倍。 [實施例6] 將第1黏著劑層之厚度設為100 μm而代替50 μm，以及使用對厚度80 μm之聚對苯二甲酸乙二酯膜(商品名「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者(膜F4 )代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作實施例6之光學用黏著片材。除剝離襯墊之厚度外的實施例2之光學用黏著片材之厚度為680 μm。又，於實施例6之光學用黏著片材中，相對於基材之厚度(TB )80 μm(＜100 μm)，第1黏著劑層之厚度(TA1 )為1.25倍，第2黏著劑層之厚度(TA2 )為6.25倍。 [比較例1] 將第1黏著劑層之厚度設為100 μm而代替50 μm，以及使用膜F3 代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作比較例1之光學用黏著片材。除剝離襯墊之厚度外的比較例1之光學用黏著片材之厚度為725 μm。又，於比較例1之光學用黏著片材中，相對於基材之厚度(TB )125 μm(≧100 μm)，第1黏著劑層之厚度(TA1 )為0.8倍(未達2.5倍)，第2黏著劑層之厚度(TA2 )為4倍。 [比較例2] 將第1黏著劑層之厚度設為250 μm而代替50 μm，以及使用膜F3 代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作比較例2之光學用黏著片材。除剝離襯墊之厚度外的比較例2之光學用黏著片材之厚度為875 μm。又，於比較例2之光學用黏著片材中，相對於基材之厚度(TB )125 μm(≧100 μm)，第1黏著劑層之厚度(TA1 )為2倍(未達2.5倍)，第2黏著劑層之厚度(TA2 )為4倍。 [比較例3] 將第1黏著劑層之厚度設為100 μm而代替50 μm，以及使用對厚度25 μm之聚對苯二甲酸乙二酯膜(商品名「DIAFOIL T100-25」，面內相位差1000，三菱樹脂股份有限公司製造)之兩面實施電暈處理所得者(膜F5 )代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作比較例3之光學用黏著片材。除剝離襯墊之厚度外的比較例3之光學用黏著片材之厚度為625 μm。又，於比較例3之光學用黏著片材中，相對於基材之厚度(TB )25 μm，第1黏著劑層之厚度(TA1 )為4倍，第2黏著劑層之厚度(TA2 )為20倍。 [比較例4] 將第1黏著劑層之厚度設為100 μm而代替50 μm，以及使用對厚度40 μm之未延伸聚丙烯膜(商品名「Suntox-CP MK12」，面內相位差55，Suntox股份有限公司製造)之兩面實施電暈處理所得者(膜F6 )代替膜F1 作為光學用黏著片材之基材，除此以外，以與實施例1相同之方式製作比較例4之光學用黏著片材。除剝離襯墊之厚度外的比較例4之光學用黏著片材之厚度為640 μm。又，於比較例4之光學用黏著片材中，相對於基材之厚度(TB )40 μm，第1黏著劑層之厚度(TA1 )為2.5倍，第2黏著劑層之厚度(TA2 )為12.5倍。 ＜基材之平均線膨脹率＞ 針對用作實施例及比較例之光學用黏著片材之基材的上述膜F1 ～F6 ，分別研究機械方向(MD)之於90～100℃下之平均線膨脹率、及寬度方向(MD)之於90～100℃下之平均線膨脹率。於求出90～100℃下之平均線膨脹率時，具體而言，自膜切出樣品片(3 mm×20 mm)，對該樣品片使用熱機械性分析裝置(商品名「TMA/SS6000」，精工電子奈米科技公司製造)進行線膨脹測定。於本測定中，將裝置所具備之一對夾頭所夾持之測定試樣之初始夾頭間距離(測定之初始長度)設為10 mm，將測定氛圍設為空氣氛圍(流量200 ml/分鐘)，將測定模式設為拉伸模式(負荷19.6 mN)，將測定溫度範圍設為自20℃直至350℃，將升溫速度設為例如5℃/分鐘。將其結果示於表1中。 ＜95℃接著可靠性＞ 針對實施例及比較例之各光學用黏著片材，以下述方式研究對偏光膜之接著可靠性。於供於接著可靠性試驗之樣品構造體之製作中，首先準備使用手壓輥將偏光膜(商品名「SEG1425DU」，日東電工股份有限公司製造)貼合於玻璃板(120 mm×180 mm)而成的附偏光膜之玻璃。繼而，自光學用黏著片材剝離第1黏著劑層側之剝離襯墊後，對於具有聚碳酸酯層與聚甲基丙烯酸甲酯層之兩層構造之複合片(商品名「Iupilon sheet HMRS51T」，90 mm×160 mm，三菱瓦斯化學股份有限公司製造)之聚碳酸酯面，將該光學用黏著片材以其第1黏著劑層側進行貼合。繼而，自如此般貼合於聚碳酸酯面之光學用黏著片材剝離第2黏著劑層側之剝離襯墊後，將該附複合片之光學用黏著片材以其第2黏著劑層側貼合於上述附偏光膜之玻璃之偏光膜面。此時，以光學用黏著片材之基材之機械方向(MD)與偏光膜之易透過軸之方向成45度的配向，將附複合片之光學用黏著片材與附偏光膜之玻璃貼合。其後，藉由真空加壓進行附複合片之光學用黏著片材與附偏光膜之玻璃之間的壓接。於該真空加壓中，將壓力設為0.3 MPa，將真空度設為100 Pa，將加壓時間設為5秒鐘。如此般對各光學用黏著片材製作供於95℃接著可靠性試驗之樣品構造體。然後，將樣品構造體投入至高壓釜中，於溫度50℃及壓力0.5 MPa之條件下進行15分鐘之高壓釜處理。針對高壓釜處理後之樣品構造體，於95℃之環境下放置24小時後，藉由目視進行觀察。針對各樣品構造體，於在其厚度方向上可透過觀察之情況下，將於觀察將無發泡且亦無剝離之情形評價為95℃接著可靠性良好(○)，將存在發泡或剝離之情形評價為95℃接著可靠性不良(×)。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黏著片材，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1.0～1.2mm，松波硝子工業股份有限公司製造)之狀態下的光學用黏著片材進行。將其結果示於表1中。 [評價] 具備本發明之構成的實施例1～6之光學用黏著片材均實現了良好之95℃接著可靠性。相對於此，比較例1～4之光學用黏著片材均未實現良好之95℃接著可靠性。於比較例1之光學用黏著片材中，基材之厚度TB 為125 μm，相對於此，第1黏著劑層之厚度TA1 過小為100 μm，因此認為於上述接著可靠性試驗中，無法利用黏著劑層充分地緩和基材中所產生之熱應力，於第1黏著劑層與作為其被接著體之複合片之聚碳酸酯面的界面產生局部剝離現象。於比較例2之光學用黏著片材中，基材之厚度TB 為125 μm，相對於此，第1黏著劑層之厚度TA1 過小為250 μm，因此認為於上述接著可靠性試驗中，無法利用黏著劑層充分地緩和基材中所產生之熱應力，於第1黏著劑層與作為其被接著體之複合片之聚碳酸酯面的界面產生局部剝離現象。比較例3之光學用黏著片材由於基材之厚度TB 過小為25 μm而基材之剛性過小，故而於製作過程中之基材與黏著劑層之貼合作業時或光學用黏著片材貼合於被接著體之作業時，即便微小亦容易於貼合界面產生皺褶。關於此種比較例3之光學用黏著片材，認為由於該皺褶之存在，而於基材與黏著劑層之界面或者於黏著劑層與被接著體之界面尤其於高溫條件下容易產生氣泡，因此未獲得良好之95℃接著可靠性。關於比較例4之光學用黏著片材，由於基材於90～100℃下之平均線膨脹率之絕對值超過2×10-4 ℃-1 而過大，因此認為於上述接著可靠性試驗中，各黏著劑層難以追隨於基於溫度變化之基材之變形，而於基材與第1黏著劑層之界面或者基材與第2黏著劑層之界面產生局部剝離現象。 [表1] FIG. 1 is a partial cross-sectional view of an adhesive sheet X as an optical adhesive sheet according to an embodiment of the present invention. The adhesive sheet X has a laminated structure including a base material 10, an adhesive layer 11 as a first adhesive layer, and an adhesive layer 12 as a second adhesive layer. The adhesive sheet X can be used as, for example, a transparent optical adhesive sheet for filling a transparent cover between the transparent cover and the liquid crystal panel in a liquid crystal display device which is designed to face and face the liquid crystal panel. Specifically, the adhesive sheet X can be used as a transparent optical adhesive sheet between the transparent cover and the liquid crystal panel in the liquid crystal display device of the above-mentioned design in the following manner: with an adhesive layer 11 sides are attached to the transparent cover and the adhesive layer 12 is attached to the outermost layer of the transparent cover side of the liquid crystal panel. The liquid crystal panel includes a liquid crystal panel with a table-embedded touch sensor or a liquid crystal panel with an in-cell touch sensor incorporated into the liquid crystal panel. Regarding such a liquid crystal panel with a built-in touch panel, a polarizing film, which is an element of a liquid crystal panel for realizing a so-called liquid crystal shutter function, is mostly located on the surface layer of the laminated structure of the panel. The base material 10 of the adhesive sheet X is a part of the adhesive sheet X that functions as a support, and has light transmittance. The thickness of the substrate 10 exceeds 25 μm, preferably 30 μm or more, more preferably 40 μm or more, more preferably 50 μm or more, more preferably 60 μm or more, more preferably 70 μm or more, and even more preferably 80 μm or more . On the other hand, the thickness of the substrate 10 is preferably 150 μm or less. Moreover, the thickness T of the substrate 10 B T thickness of adhesive layer 11 A1 And the thickness T of the adhesive layer 12 A2 Tied to T B In the case of less than 100 μm, T is satisfied B ≦ T A1 ≦ T A2 , Preferably to meet 1.2T B ≦ T A1 ≦ T A2 , Better to meet 1.5T B ≦ T A1 ≦ T A2 , Better to satisfy 2T B ≦ T A1 ≦ T A2 . The thickness T of the substrate 10 B T thickness of adhesive layer 11 A1 And the thickness T of the adhesive layer 12 A2 Tied to T B When it is 100 μm or more, 2.5T is satisfied B ≦ T A1 ≦ T A2 , Preferably to meet 2.7T B ≦ T A1 ≦ T A2 , Better to meet 3T B ≦ T A1 ≦ T A2 , Better to meet 3.5T B ≦ T A1 ≦ T A2 , Better to satisfy 4T B ≦ T A1 ≦ T A2 . Regarding the base material 10, the absolute value of the average linear expansion ratio at 90 to 100 ° C is 2 × 10 -4 ℃ -1 Below, preferably 1.5 × 10 -4 ℃ -1 Below, more preferably 1 × 10 -4 ℃ -1 the following. Regarding the absolute value of the average linear expansion ratio, when the base material 10 is made of resin, the value of the so-called mechanical direction (MD) of the base material 10 and the value of the so-called width direction (TD) orthogonal to the mechanical direction are mostly In different cases, when the two absolute values are different, a larger value is set to the absolute value of the average linear expansion ratio at 90 to 100 ° C. The average linear expansion ratio at 90 to 100 ° C can be obtained, for example, based on a linear expansion measurement using a thermomechanical analysis device (trade name "TMA / SS6000", manufactured by SII Nanotechnology). In this measurement, for example, the initial inter-chuck distance (initial length of measurement) of a measurement sample held by a pair of chucks of the device is set to 10 mm, and the measurement atmosphere is an air atmosphere (flow rate 200 ml) / Minute), the measurement mode is set to the tensile mode (load 19.6 mN), the measurement temperature range is set to from 20 ° C to 350 ° C, and the temperature rise rate is set to, for example, 5 ° C / minute. 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 retardation of the substrate 10 refers to a surface 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. Examples of the material for forming the base material 10 include polyesters such as polyethylene terephthalate (PET), polyolefins such as polypropylene and polyethylene, polycarbonates, polyamides, and polymers. Ammonium imine, acrylic resin, polystyrene, acetate, polyether amidine, and triethylammonium cellulose. The substrate 10 may include one kind of material, or may include two or more kinds of materials. The base material 10 may have a multilayer structure. In addition, the surface on the side of the adhesive layer 11 and the surface on the side of the adhesive layer 12 in the base material 10 may be subjected to surface treatments to improve the adhesion with the adhesive layer, respectively. Examples of such surface treatment include physical treatments such as corona treatment and plasma treatment, and chemical treatments such as primer treatment. The base material 10 having the in-plane retardation as described above includes, for example, a resin film subjected to a uniaxial stretching process or a biaxial stretching process to a certain degree. The adhesive layers 11 and 12 of the adhesive sheet 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. Examples of the adhesive contained in the adhesive layers 11 and 12 include an acrylic polymer as an acrylic adhesive, a polyurethane as a urethane adhesive, and a silicone adhesive. Agent. In order to achieve the degree of adhesion required for the adhesive layers 11 and 12 of the optical adhesive sheet X, an acrylic polymer is preferably used as the adhesive. 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 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 terms of achieving an appropriate hardness or adhesiveness of the adhesive layer formed by containing the acrylic polymer. 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 f × 150 mm for each column • Column temperature (measurement temperature): 40 ° C • Eluent: Tetrahydrofuran (THF) • Flow rate: 0.4 mL / min • Sample injection volume: 20 μL • Sample concentration : Approx. 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 3-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 LAA-46", manufactured by ADEKA Corporation) and 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl)- 4,6-bis (4-phenylphenyl) -1,3,5-tri (trade name "TINUVIN 479 , BASF Corp.). 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 LΑ-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, and an antioxidant, as long as they do not impair the effect of the present invention, as needed. , Chain transfer agents, plasticizers, softeners, surfactants, and antistatic agents. Examples of the tackifying resin include rosin derivatives, polyterpene resins, petroleum resins, and oil-soluble phenols. Regarding the thickness of the adhesive layer 11, the adhesive layer 11 can ensure a high storage elastic modulus (shear storage elastic modulus) at a high temperature of, for example, 95 ° C, to achieve a higher shear of the adherend. From the standpoint of adhesion, it is preferably 450 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. Regarding the thickness of the adhesive layer 12, the adhesive layer 12 can ensure a sufficient loss tangent (= loss elastic modulus / storage elastic modulus) at a high temperature such as 95 ° C. to achieve a higher value for the adherend. From the viewpoint of shear adhesion, it is preferably 1,000 μm or less, more preferably 950 μm or less, and even more preferably 900 μm or less. From the viewpoint of thickening the adhesive sheet X, the thickness of the adhesive layer 12 is preferably larger than the thickness of the adhesive layer 11. With regard to the optical adhesive sheet X having the above-mentioned configuration, 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 haze of the adhesive sheet X for optical use is preferably 5% or less, more preferably 4% or less, even more preferably 3% or less, more preferably 2.5% or less, even more preferably 2% or less, and even more preferably 1.5% or less, more preferably 1% or less. The haze is a value measured in accordance with JIS K 7136. The adhesive sheet X may be provided with a release film (release liner) so as to cover the adhesive surface 11 a of the adhesive layer 11. The adhesive sheet X may be provided with a release film (release liner) so as to cover the adhesive surface 12 a of the adhesive layer 12. The release film is a component for protecting the adhesive layers 11 and 12 of the adhesive sheet X from being exposed, and is peeled from the adhesive sheet X when the adhesive sheet X is attached to the adherend. Examples of the release film include a substrate having a release treatment layer, a low-adhesive substrate including a fluoropolymer, and a low-adhesive substrate including a non-polar polymer. The surface of the isolation film may also be subjected to a mold release treatment, an antifouling treatment, or an antistatic treatment. The thickness of the separator is, for example, 5 to 200 μm. The adhesive sheet 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 base material 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, it is preferable to use an adhesive composition that can be cured by polymerization reaction by irradiation with active energy rays. That is, the adhesive layer 11 and / or the adhesive layer 12 are preferably hardened products of an active energy ray-curable adhesive composition. 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 monomer composition of a specific composition of the acrylic polymer. Moreover, this adhesive composition may contain other components used as needed as a component of the adhesive layer formed. Examples of the active energy ray that is 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. Use ultraviolet rays. 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, it is preferable that the adhesive layer 11 is a hardened product of an active energy ray-curable adhesive composition in terms of achieving an 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 that the adhesive layer 12 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, benzophenacylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyethylene. 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 dibenzoylperoxide 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 above-mentioned adhesive sheet X manufactured in the above-mentioned manner is suitable for increasing the thickness while ensuring the adhesion reliability to the adherend. The reason is as follows. There may be cases in which the adhered state of the bonded state through the double-sided adhesive sheet for optical use has a different material composition. For example, in an automotive liquid crystal display or a liquid crystal display device, the outermost surface layer on the laminated structure constituting the forefront of the display screen and the liquid crystal panel assembled into the device often has different material compositions. The transparent cover is, for example, a glass cover or a resin cover. The transparent cover tends to exhibit the following characteristics: it expands during the temperature increase from room temperature, and shrinks during the temperature decrease to room temperature. On the other hand, for example, a polarizing film is located on the outermost layer of a liquid crystal panel. The polarizing film for liquid crystal panel applications tends to show the following characteristics: shrinkage during the temperature rise from room temperature and expansion during the temperature decrease to room temperature. This deformation characteristic is opposite to that of the transparent cover. In addition, such a polarizing film has relatively large dimensional changes in the direction of surface expansion based on temperature changes. In the case where a single adhesive layer is responsible for filling between two members having different deformation characteristics due to temperature changes and other characteristics due to different material compositions, there is a tendency that the larger the thickness of the adhesive layer, the more the It is difficult to make the single adhesive layer simultaneously ensure the reliability of bonding to the two members while corresponding to the difference in characteristics of the two members. The reason is that there is a tendency that the larger the thickness of a single adhesive layer between two members with different material constitutions, the more difficult it is to make the side of the adhesive layer appropriately correspond to the respective characteristics of the two members and ensure that Full shear adhesion. In contrast, the adhesive sheet X has a laminated structure including an adhesive layer 11, an adhesive layer 12, and a substrate 10 therebetween, so it is easy to make each adhesive layer correspond to the temperature change based on its adherend. The deformation characteristics and other characteristics are required to be thickened. When the adhesive sheet X is applied to a transparent adhesive sheet between a transparent cover for filling a liquid crystal display device and a liquid crystal panel, for example, one side of the adhesive layer 11 may correspond to a characteristic side of the transparent cover of the liquid crystal display device. The thickness of the adhesive layer 12 is sought while the thickness of the adhesive layer 12 corresponds to the characteristics of the outermost layer of the liquid crystal panel. As shown above, the case where the adhesive sheet X has a laminated structure including the adhesive layer 11, the adhesive layer 12, and the substrate 10 therebetween is suitable for one side to make the adhesive layer 11 and the adhesive layer 12 soft separately The thickness of the adhesive sheet X as a whole is increased in accordance with the characteristics of the respective adherends. In addition, the thickness of the base material 10 of the adhesive sheet X exceeds 25 μm as described above, preferably 30 μm or more, more preferably 40 μm or more, more preferably 50 μm or more, more preferably 60 μm or more, It is preferably 70 μm or more, and more preferably 80 μm or more. Such a structure is suitable for ensuring the function of the substrate 10 as a support in the adhesive sheet X, and suppressing the occurrence of wrinkles on the adhesive sheet X during the manufacturing process of the adhesive sheet X or the operation of bonding to the adherend. Pleats. Such a wrinkle suppression system helps to ensure the adhesion reliability of the adhesive sheet X to the adherend. The absolute value of the average linear expansion coefficient of the base material 10 of the adhesive sheet X at 90 to 100 ° C. is 2 × 10 as described above. -4 ℃ -1 Below, preferably 1.5 × 10 -4 ℃ -1 Below, more preferably 1 × 10 -4 ℃ -1 the following. The composition related to the low thermal expansion rate of the base material 10 that brings about the above technical effects is suitable for suppressing peeling at the interface between the base material 10 and the adhesive layer 11 or the interface between the base material 10 and the adhesive layer 12. The suppression of the interface peeling between the substrate 10 and each adhesive layer helps to ensure the adhesion reliability of the adhesive sheet X. In addition, in the adhesive sheet X, the thickness T of the base material 10 B T thickness of adhesive layer 11 A1 And the thickness T of the adhesive layer 12 A2 As above B Meets T below 100 μm B ≦ T A1 ≦ T A2 , Preferably to meet 1.2T B ≦ T A1 ≦ T A2 , Better to meet 1.5T B ≦ T A1 ≦ T A2 , Better to satisfy 2T B ≦ T A1 ≦ T A2 , At T B Meets 2.5T when it is 100 μm or more B ≦ T A1 ≦ T A2 , Preferably to meet 2.7T B ≦ T A1 ≦ T A2 , Better to meet 3T B ≦ T A1 ≦ T A2 , Better to meet 3.5T B ≦ T A1 ≦ T A2 , Better to satisfy 4T B ≦ T A1 ≦ T A2 . Such a structure is suitable for using an adhesive layer to alleviate thermal stress such as shrinkage stress that may also occur in the substrate 10 having a relatively small thermal expansion coefficient as described above, and to suppress the thermal stress from acting on its adherend, and to suppress it Delamination occurs at the interface between the adhesive layer and its adherend. The suppression of the peeling of the interface between the adhesive layer 11 and its adherend, and the suppression of the peeling of the interface between the adhesive layer 12 and its adherend help to ensure the bonding reliability of the adhesive sheet X. As described above, the adhesive sheet X is suitable for thickening while ensuring the reliability. In such an adhesive sheet X, the thickness of the substrate 10 is preferably 150 μm or less as described above. This configuration is suitable for ensuring the so-called step-followability by suppressing the rigidity of the adhesive sheet X from becoming too large, and suppressing the occurrence of defects caused by the step when there is a step on the surface of the adherend. For example, the liquid crystal panel side surface of a transparent cover used for a liquid crystal display device is often printed along the periphery of the cover. The printing has a specific thickness, which causes a step difference on the side surface of the liquid crystal panel of the transparent cover. This printing step is worse than when an adhesive sheet is attached to the side surface of the liquid crystal panel of the transparent cover, which may cause defects such as local bulging of the adhesive sheet. The structure in which the thickness of the substrate 10 in the adhesive sheet X is 150 μm or less is suitable for suppressing the rigidity of the adhesive sheet X from becoming too large, and for example, attaching the adhesive sheet X to a transparent cover used for a liquid crystal display device. In the state, the step followability of the adhesive sheet X is ensured, thereby suppressing defects such as local bulging of the adhesive sheet X due to the printing step on the transparent cover surface. In the adhesive sheet X, 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. Such a structure is suitable for the case where an adhesive sheet X is filled between a transparent cover and a liquid crystal panel in a liquid crystal display device, and the so-called generation of a display screen of the device through a lens with a polarizing function such as polarized sunglasses is prevented from generating so-called Blanking phenomenon. In addition, there is a tendency that the larger the in-plane phase difference of the base material 10 is, and when the adhesive sheet X is filled between the transparent cover and the liquid crystal panel in the liquid crystal display device, for example, with polarizing functions such as polarizing sunglasses, etc. The so-called color unevenness when the lens sees the display screen of the device is more suppressed. As described above, the thickness of the adhesive layer 11 is preferably 450 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. Such a structure is preferable in that the adhesive layer 11 is made to have a sufficient storage elastic modulus (shear storage elastic modulus) at a high temperature of, for example, 95 ° C., so as to achieve a higher adhesion to the adherend. Shear adhesion. Regarding the adhesive layer 11, the storage elastic modulus at 95 ° C is, for example, 1.0 × 10 4 Pa or more, preferably 5.0 × 10 4 Above Pa, more preferably 1.0 × 10 5 Pa or more. Transparent resin covers such as polycarbonate covers used for liquid crystal display devices may cause so-called outgassing in a high temperature environment. In this case, the storage elastic modulus of the adhesive layer 11 at a high temperature of 95 ° C is, for example, 1.0 × 10 4 Above Pa and higher, the easier it is for the adhesive sheet X to be attached to the resin cover with the adhesive layer 11 side, the generation of the adhesive layer 11 or the adhesive sheet X due to outgassing from the resin cover is suppressed. Defects such as local bulging or peeling. The storage elastic modulus of the adhesive layer 11 can be adjusted by: adjusting the ratio of various monomers used to form the acrylic polymer in the adhesive layer; or an adhesive combination for forming the adhesive layer Adjustment of the content of the copolymerizable polyfunctional (meth) acrylate in the composition; adjustment of the content of the cross-linking agent used to crosslink the formed acrylic polymer in the above composition; The thickness of the adhesive composition layer or the adhesive layer is set. The storage elastic modulus can be obtained, for example, based on a dynamic viscoelasticity measurement using a dynamic viscoelasticity measuring device (trade name “ARES”, manufactured by Rheometrics). In this measurement, the measurement mode is set to a shear mode, the measurement temperature range is set to, for example, -70 ° C to 150 ° C, the temperature rise rate is set to, for example, 5 ° C / minute, and the frequency is set to, for example, 1 Hz. As described above, the thickness of the adhesive layer 12 is preferably 1,000 μm or less, more preferably 950 μm or less, and even more preferably 900 μm or less. Such a structure is preferable in that the adhesive layer 12 can achieve a sufficient loss tangent (= loss elastic modulus / storage elastic modulus) at the high temperature of, for example, 95 ° C. to achieve adherence to the adherend. Higher shear adhesion. The loss tangent of the adhesive layer 12 at 95 ° C. is, for example, 0.08 or more, preferably 0.1 or more, more preferably 0.12 or more, and even more preferably 0.15 or more. Regarding a polarizing film for a liquid crystal panel, the adhesive layer 12 has a tendency to show a characteristic that it shrinks during the process of increasing temperature from room temperature and expands during the process of decreasing temperature to room temperature, and the dimensional change is relatively large. The loss tangent is, for example, 0.08 or more and higher, which is more suitable for the following cases: In a state where the adhesive sheet X is attached to the polarizing film of the liquid crystal panel with the adhesive layer 12 side, the adhesive layer 12 or the adhesive sheet X Following the dimensional change in the direction of surface expansion of the polarizing film based on temperature changes, the stress at the interface between the polarizing film and the adhesive layer 12 is relaxed. This kind of stress relaxation at the interface between the polarizing film and the adhesive layer 12 helps to ensure the reliability of the adhesive layer 12 or the adhesive sheet X to the polarizing film. The adjustment of the loss tangent of the adhesive layer 12 can be performed by: adjusting the ratio of various monomers used to form the acrylic polymer in the adhesive layer; or in the adhesive composition for forming the adhesive layer Adjustment of the content of the copolymerizable polyfunctional (meth) acrylate; adjustment of the content of the cross-linking agent used to crosslink the formed acrylic polymer in the above composition; adhesive during polymerization The thickness of the composition layer or the adhesive layer is set. The loss tangent can be obtained, for example, from a dynamic viscoelasticity measurement using a dynamic viscoelasticity measuring device (trade name “ARES”, manufactured by Rheometrics). In this measurement, the measurement mode is set to a shear mode, the measurement temperature range is set to, for example, -70 ° C to 150 ° C, the temperature rise rate is set to, for example, 5 ° C / minute, and the frequency is set to, for example, 1 Hz. FIG. 2 is a partial cross-sectional view of a polarizing film Y with an adhesive layer according to an embodiment of the present invention. The polarizing film Y with an adhesive layer has a laminated structure including the polarizing film 21 and an adhesive sheet X. The polarizing film 21 is a polarizing film for liquid crystal panel applications, and is, for example, a transparent protective film provided on one or both sides of a polarizing element. The thickness of the polarizing film 21 is, for example, 30 to 300 μm. When the adhesive sheet X has a laminated structure including the substrate 10 and the adhesive layers 11 and 12 as shown in FIG. 1, the polarizing film 21 is bonded to the side of the adhesive layer 12 (second adhesive layer). A release film (release liner) may be provided on the side of the adhesive sheet X opposite to the polarizing film 21 so as to cover the adhesive surface 11 a of the adhesive layer 11. The polarizing film Y with an adhesive layer provides a polarizing film for a liquid crystal panel, to which an optical adhesive sheet X that can enjoy the above-mentioned technical effects has been bonded. FIG. 3 is a partial lamination configuration diagram of a liquid crystal display device Z according to an embodiment of the present invention. The liquid crystal display device Z includes a laminated structure including a liquid crystal panel 30, a transparent cover 41, and an adhesive sheet X therebetween. The liquid crystal panel 30 has a laminated structure including a glass substrate 31 with a transparent electrode, a glass substrate 32 with a transparent electrode, a liquid crystal layer 33 therebetween, and polarizing films 34 and 35, as a so-called liquid crystal. Shutter function. The glass substrate 31 has a pixel electrode as a transparent electrode on the side of the liquid crystal layer 33. The glass substrate 32 has a counter electrode as a transparent electrode on the side of the liquid crystal layer 33. The polarizing film 34 is disposed on the side of the glass substrate 31 and is located at one end in the lamination direction of the liquid crystal panel 30. The polarizing film 35 is disposed on the side of the glass substrate 32 and is located at an end portion closest to the transparent cover 41 in the lamination direction of the liquid crystal panel 30. The polarizing films 34 and 35 are respectively polarizing films for liquid crystal panel applications, and are provided with, for example, a transparent protective film on one or both sides of a polarizing element. The thickness of each of the polarizing films 34 and 35 is, for example, 30 to 300 μm. The liquid crystal panel 30 preferably includes a surface-embedded touch sensor or an in-cell touch sensor. The so-called surface-embedded touch sensor (not shown) in the liquid crystal panel 30 is a touch sensor for realizing the function of the touch panel. However, for example, it is provided in the glass substrate 32 as opposed to the liquid crystal layer 33 side. The so-called in-cell touch sensor (not shown) in the liquid crystal panel 30 is a touch sensor for realizing the function of the touch panel, but is disposed on the side of the liquid crystal layer 33 in the glass substrate 31, for example. The touch panel function is incorporated into the liquid crystal panel 30. The LCD panel with an in-cell touch sensor or the LCD panel with an in-cell touch sensor is designed to have both the touch panel function and the LCD shutter. The functional unit is preferably reduced in thickness, weight, and manufacturing cost as a whole. The transparent cover 41 is a transparent cover used for a liquid crystal display device, and forms the forefront of the display screen of the liquid crystal display device Z. Examples of the transparent cover 41 include a transparent resin cover and a transparent glass cover. Examples of the resin cover include a cover made of polycarbonate or a cover made of polymethyl methacrylate. From the viewpoint of safety or light weight, a transparent cover made of resin is superior to a transparent cover made of glass. Especially in automotive liquid crystal display devices, this type of safety and lightness requirements are strong. In the case where the adhesive sheet X has a laminated structure including the substrate 10 and the adhesive layers 11 and 12 as shown in FIG. 1, in the liquid crystal display device Z, the adhesive layer 11 (the first adhesive layer) is used. The side is attached to the transparent cover 41 and the side of the adhesive layer 12 (the second adhesive layer) is attached to the polarizing film 35 of the liquid crystal panel 30. The laminated structure part of the polarizing film 35 and the adhesive sheet X in the liquid crystal display device Z can also be provided by the above-mentioned polarizing film Y with an adhesive layer. In the liquid crystal display device Z configured as described above, the optical adhesive sheet X filled between the polarizing film 35 and the transparent cover 41 of the liquid crystal panel 30 can enjoy the technical effects described above with respect to the adhesive sheet X. [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] It contains 78 parts by weight of 2-ethylhexyl acrylate (2EHA), 18 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 2-hydroxyethyl acrylate To the monomer mixture of 4 parts by weight of ester (HEA), 0.035 parts by weight of a first photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF) and a second photopolymerization initiator (trade name "Irgacure 184") were added. (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 about 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 Industry Co., Ltd.) were mixed to obtain an acrylic adhesive composition. [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). The composition 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 50 μm. <Formation of 2nd Adhesive Layer> The above-mentioned acrylic adhesive composition 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 a substrate having a [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 Optical Adhesive Sheets> Corona is prepared on both sides of a 38 μm-thick polyethylene terephthalate film (trade name "DIAFOIL T100C38", phase difference 1500, manufactured by Mitsubishi Resins Co., Ltd.) Treatment result (film F 1 ), After peeling one release liner from the laminated body L1 (release liner / first adhesive layer / release liner), a release liner is attached to one side through the surface of the first adhesive layer exposed by the peeling. 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 having [Release liner / First adhesive layer (thickness 50 μm) / Film F 1 (Thickness: 38 μm) / second adhesive layer (thickness: 500 μm) / release liner] An optical adhesive sheet composed of a laminate. Except for the thickness of the release liner, the thickness of the optical adhesive sheet of Example 1 was 588 μm. In addition, in the optical adhesive sheet of Example 1, the thickness (T B ) 38 μm (<100 μm), the thickness of the first adhesive layer (T A1 ) Is 1.3 times the thickness of the second adhesive layer (T A2 ) Is 13.2 times. [Example 2] The thickness of the first adhesive layer was set to 100 μm instead of 50 μm, and a polyethylene terephthalate film (trade name “DIAFOIL T100E50”) with a thickness of 50 μm was used, and the phase difference was in-plane. 2000, manufactured by Mitsubishi Resins Co., Ltd.) 2 ) Instead of membrane F 1 Except as a base material of an optical adhesive sheet, an optical adhesive sheet 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 adhesive sheet of Example 2 was 650 μm. In addition, in the optical adhesive sheet of Example 2, the thickness (T B ) 50 μm (<100 μm), the thickness of the first adhesive layer (T A1 ) Is 2 times the thickness of the second adhesive layer (T A2 ) Is 10 times. [Example 3] The thickness of the first adhesive layer was set to 250 μm instead of 50 μm, and the film F was used. 2 Instead of membrane F 1 Except as a base material of an optical adhesive sheet, an optical adhesive sheet of Example 3 was produced in the same manner as in Example 1. Except for the thickness of the release liner, the thickness of the optical adhesive sheet of Example 3 was 800 μm. In addition, in the optical adhesive sheet of Example 3, the thickness (T B ) 50 μm (<100 μm), the thickness of the first adhesive layer (T A1 ) Is 5 times the thickness of the second adhesive layer (T A2 ) Is 10 times. [Example 4] The thickness of the first adhesive layer was set to 500 μm instead of 50 μm, and the film F was used. 2 Instead of membrane F 1 Except as a base material of an optical adhesive sheet, an optical adhesive sheet of Example 4 was produced in the same manner as in Example 1. Except for the thickness of the release liner, the thickness of the optical adhesive sheet of Example 2 was 1050 μm. In addition, in the optical adhesive sheet of Example 4, the thickness (T B ) 50 μm (<100 μm), the thickness of the first adhesive layer (T A1 ) Is 10 times, the thickness of the second adhesive layer (T A2 ) Is 10 times. [Example 5] The thickness of the first adhesive layer was set to 500 μm instead of 50 μm, and a polyethylene terephthalate film (brand name “DIAFOIL T104E125”) with a thickness of 125 μm was used, and the phase difference was in-plane. 5000, manufactured by Mitsubishi Resin Co., Ltd.) 3 ) Instead of membrane F 1 Except as a base material of an optical adhesive sheet, an optical adhesive sheet of Example 5 was produced in the same manner as in Example 1. Except for the thickness of the release liner, the thickness of the optical adhesive sheet of Example 2 was 1125 μm. In addition, in the optical adhesive sheet of Example 5, the thickness (T B 125 μm (≧ 100 μm), the thickness of the first adhesive layer (T A1 ) Is 4 times the thickness of the second adhesive layer (T A2 ) Is 4 times. [Example 6] The thickness of the first adhesive layer was set to 100 μm instead of 50 μm, and a polyethylene terephthalate film (trade name “SRF”) with a thickness of 80 μm was used, and the in-plane retardation was 8400. , Manufactured by Toyobo Co., Ltd.) 4 ) Instead of membrane F 1 Except as a base material of an optical adhesive sheet, an optical adhesive sheet of Example 6 was produced in the same manner as in Example 1. Except for the thickness of the release liner, the thickness of the optical adhesive sheet of Example 2 was 680 μm. In addition, in the optical adhesive sheet of Example 6, the thickness (T B ) 80 μm (<100 μm), the thickness of the first adhesive layer (T A1 ) Is 1.25 times the thickness of the second adhesive layer (T A2 ) Is 6.25 times. [Comparative Example 1] The thickness of the first adhesive layer was set to 100 μm instead of 50 μm, and the film F was used. 3 Instead of membrane F 1 Except having used as a base material of the optical adhesive sheet, it carried out similarly to Example 1, and produced the optical adhesive sheet of the comparative example 1. The thickness of the optical adhesive sheet of Comparative Example 1 except for the thickness of the release liner was 725 μm. In addition, in the optical adhesive sheet of Comparative Example 1, the thickness (T B 125 μm (≧ 100 μm), the thickness of the first adhesive layer (T A1 ) Is 0.8 times (less than 2.5 times), and the thickness of the second adhesive layer (T A2 ) Is 4 times. [Comparative Example 2] The thickness of the first adhesive layer was set to 250 μm instead of 50 μm, and the film F was used 3 Instead of membrane F 1 Except having used as a base material of the optical adhesive sheet, it carried out similarly to Example 1, and produced the optical adhesive sheet of the comparative example 2. The thickness of the optical adhesive sheet of Comparative Example 2 except for the thickness of the release liner was 875 μm. In addition, in the optical adhesive sheet of Comparative Example 2, the thickness (T B 125 μm (≧ 100 μm), the thickness of the first adhesive layer (T A1 ) Is 2 times (less than 2.5 times), and the thickness of the second adhesive layer (T A2 ) Is 4 times. [Comparative Example 3] The thickness of the first adhesive layer was set to 100 μm instead of 50 μm, and a polyethylene terephthalate film (trade name “DIAFOIL T100-25” with a thickness of 25 μm) was used in the plane. Corona treatment with a retardation of 1,000 (made by Mitsubishi Resin Co., Ltd.) on both sides (film F 5 ) Instead of membrane F 1 Except having used as a base material of the optical adhesive sheet, it carried out similarly to Example 1, and produced the optical adhesive sheet of the comparative example 3. The thickness of the optical adhesive sheet of Comparative Example 3 except for the thickness of the release liner was 625 μm. In addition, in the optical adhesive sheet of Comparative Example 3, the thickness (T B ) 25 μm, thickness of the first adhesive layer (T A1 ) Is 4 times the thickness of the second adhesive layer (T A2 ) Is 20 times. [Comparative Example 4] The thickness of the first adhesive layer was set to 100 μm instead of 50 μm, and an unstretched polypropylene film (trade name “Suntox-CP MK12”) with a thickness of 40 μm was used, and the in-plane retardation was 55. Corona treatment on both sides (made by Suntox Co., Ltd.) (film F 6 ) Instead of membrane F 1 Except having used as a base material of the optical adhesive sheet, it carried out similarly to Example 1, and produced the optical adhesive sheet of the comparative example 4. The thickness of the optical adhesive sheet of Comparative Example 4 except for the thickness of the release liner was 640 μm. In addition, in the optical adhesive sheet of Comparative Example 4, the thickness (T B 40 μm, thickness of the first adhesive layer (T A1 ) Is 2.5 times the thickness of the second adhesive layer (T A2 ) Is 12.5 times. <Average Linear Expansion Rate of Base Material> The above-mentioned film F for the base material of the optical adhesive sheet used in Examples and Comparative Examples 1 ~ F 6 The average linear expansion rate at 90 to 100 ° C in the machine direction (MD) and the average linear expansion rate at 90 to 100 ° C in the width direction (MD) were studied separately. When the average linear expansion ratio at 90 to 100 ° C was obtained, specifically, a sample piece (3 mm × 20 mm) was cut out from the film, and a thermomechanical analysis device (trade name "TMA / SS6000" was used for the sample piece. ", Manufactured by Seiko Instruments Nano Technology Co., Ltd.) for linear expansion measurement. In this measurement, the initial inter-chuck distance (initial length of the measurement) of the measurement sample held by a pair of chucks provided in the device was set to 10 mm, and the measurement atmosphere was set to an air atmosphere (flow rate 200 ml / Minutes), the measurement mode is set to the tensile mode (load 19.6 mN), the measurement temperature range is set from 20 ° C to 350 ° C, and the temperature rise rate is set to, for example, 5 ° C / minute. The results are shown in Table 1. <95 ° C Adhesion Reliability> For each of the optical adhesive sheets of Examples and Comparative Examples, the adhesion reliability to a polarizing film was examined in the following manner. In the production of the sample structure for the subsequent reliability test, firstly, a polarizing film (trade name "SEG1425DU", manufactured by Nitto Denko Corporation) was attached to a glass plate (120 mm x 180 mm) using a hand roller. Glass with polarizing film. Then, after the release liner on the first adhesive layer side was peeled from the optical adhesive sheet, a composite sheet having a two-layer structure of a polycarbonate layer and a polymethyl methacrylate layer (trade name "Iupilon sheet HMRS51T" (90 mm × 160 mm, manufactured by Mitsubishi Gas Chemical Co., Ltd.) on a polycarbonate surface, and the optical adhesive sheet was bonded to the first adhesive layer side. Then, after the release liner on the second adhesive layer side was peeled off from the optical adhesive sheet bonded to the polycarbonate surface in this way, the optical adhesive sheet with the composite sheet was placed on the second adhesive layer side Laminated on the polarizing film surface of the glass with a polarizing film. At this time, with the orientation of the mechanical direction (MD) of the substrate of the optical adhesive sheet and the direction of the easy transmission axis of the polarizing film at 45 degrees, the optical adhesive sheet with the composite sheet and the glass with the polarizing film were pasted. Together. Thereafter, pressure bonding between the optical adhesive sheet with the composite sheet and the glass with the polarizing film was performed by vacuum pressure. In this vacuum pressing, the pressure was set to 0.3 MPa, the degree of vacuum was set to 100 Pa, and the pressing time was set to 5 seconds. In this manner, a sample structure was prepared for each optical adhesive sheet and subjected to a reliability test at 95 ° C. Then, the sample structure was put into an autoclave, and an autoclave treatment was performed at a temperature of 50 ° C. and a pressure of 0.5 MPa for 15 minutes. The autoclave-treated sample structure was left to stand at 95 ° C for 24 hours, and then visually observed. For each sample structure, in the case where it can be observed through in the thickness direction, it will be evaluated as 95 ° C without foaming and peeling when observed. Then the reliability is good (○), and there will be foaming or peeling. The case was evaluated as 95 ° C followed by poor reliability (×). The results are shown in Table 1. <Haze> For each optical adhesive sheet in the examples and comparative examples, a haze meter HM-150 (Murakami Color Technology Research Institute Co., Ltd.) was used to measure the haze (%) in accordance with the method prescribed by JIS K 7136. ). This measurement is an optical pressure-sensitive adhesive sheet in a state in which two release liners are peeled off and attached to a glass slide (trade name "Slide S1112", thickness 1.0 to 1.2 mm, manufactured by Songbo Glass Industry Co., Ltd.).材 进行。 Material carried. The results are shown in Table 1. [Evaluation] The optical adhesive sheets of Examples 1 to 6 provided with the structure of the present invention all achieved good 95 ° C adhesion reliability. On the other hand, none of the optical adhesive sheets of Comparative Examples 1 to 4 achieved good 95 ° C adhesion reliability. The thickness T of the substrate in the optical adhesive sheet of Comparative Example 1 B 125 μm, in contrast, the thickness T of the first adhesive layer A1 It is too small as 100 μm. Therefore, in the above-mentioned adhesion reliability test, it is considered that the thermal stress generated in the substrate cannot be sufficiently relieved by the adhesive layer. Polycarbonate was formed between the first adhesive layer and the composite sheet as its adherend. Partial peeling occurs at the interface of the ester surface. The thickness T of the substrate in the optical adhesive sheet of Comparative Example 2 B 125 μm, in contrast, the thickness T of the first adhesive layer A1 It is too small as 250 μm. Therefore, in the above-mentioned adhesion reliability test, it is considered that the thermal stress generated in the substrate cannot be sufficiently relieved by the adhesive layer. Partial peeling occurs at the interface of the ester surface. The adhesive sheet for Comparative Example 3 due to the thickness T of the substrate B It is too small as 25 μm and the rigidity of the substrate is too small. Therefore, when the substrate and the adhesive layer are bonded during the manufacturing process or when the optical adhesive sheet is bonded to the adherend, it is easy to paste even if it is small. Wrinkles at the interface. Regarding such an optical adhesive sheet of Comparative Example 3, it is considered that bubbles exist easily at the interface between the substrate and the adhesive layer or the interface between the adhesive layer and the adherend due to the existence of the wrinkles, especially at high temperatures. Therefore, good 95 ° C adhesion reliability was not obtained. Regarding the optical adhesive sheet of Comparative Example 4, the absolute value of the average linear expansion coefficient of the substrate at 90 to 100 ° C. exceeded 2 × 10 -4 ℃ -1 It is too large, so it is considered that in the above-mentioned subsequent reliability test, it is difficult for each adhesive layer to follow the deformation of the substrate based on temperature changes, but at the interface between the substrate and the first adhesive layer or between the substrate and the second adhesive layer Partial peeling occurs at the interface. [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

21‧‧‧偏光膜21‧‧‧ polarizing film

30‧‧‧液晶面板30‧‧‧LCD panel

31、32‧‧‧玻璃板31, 32‧‧‧ glass plate

33‧‧‧液晶層33‧‧‧LCD layer

34、35‧‧‧偏光膜34, 35‧‧‧ polarizing film

41‧‧‧透明罩41‧‧‧ transparent cover

X‧‧‧黏著片材(光學用黏著片材)X‧‧‧ Adhesive sheet (adhesive sheet for optics)

Y‧‧‧附黏著劑層之偏光膜Y‧‧‧ polarizing film with adhesive layer

Z‧‧‧液晶顯示裝置Z‧‧‧LCD display device

圖1係本發明之一實施形態之光學用黏著片材之局部剖視圖。 圖2係本發明之一實施形態之偏光膜之局部剖視圖。 圖3係本發明之一實施形態之液晶顯示裝置中之局部積層構成圖。FIG. 1 is a partial cross-sectional view of an optical adhesive sheet according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of a polarizing film according to an embodiment of the present invention. FIG. 3 is a partial lamination configuration diagram of a liquid crystal display device according to an embodiment of the present invention.

Claims (10)

一種光學用黏著片材，其具有包含第1黏著劑層、第2黏著劑層、及該第1與第2黏著劑層之間的基材之積層構造，且 上述基材係厚度超過25 μm，且90～100℃下之平均線膨脹率之絕對值為2×10-4 ℃-1 以下， 上述基材之厚度TB 、上述第1黏著劑層之厚度TA1 、及上述第2黏著劑層之厚度TA2 係於TB 未達100 μm之情形時滿足TB ≦TA1 ≦TA2 ，於TB 為100 μm以上之情形時滿足2.5TB ≦TA1 ≦TA2 。An optical adhesive sheet having a laminated structure including a first adhesive layer, a second adhesive layer, and a substrate between the first and second adhesive layers, and the thickness of the substrate is more than 25 μm. And the absolute value of the average linear expansion coefficient at 90 to 100 ° C is 2 × 10 -4 ° C -1 or less, the thickness T B of the substrate, the thickness T A1 of the first adhesive layer, and the second adhesion satisfying T B ≦ T A1 ≦ T A2 T A2 based upon the thickness of the layer of less than 100 μm in the case of T B, satisfies 2.5T B ≦ T A1 ≦ T A2 T B when in the case of less than 100 μm. 如請求項1之光學用黏著片材，其中上述第1黏著劑層之厚度為450 μm以下。For example, the optical adhesive sheet according to claim 1, wherein the thickness of the first adhesive layer is 450 μm or less. 如請求項1之光學用黏著片材，其中上述第2黏著劑層之厚度為1000 μm以下。For example, the optical adhesive sheet according to claim 1, wherein the thickness of the second adhesive layer is 1000 μm or less. 如請求項1之光學用黏著片材，其中上述基材之厚度為150 μm以下。For example, the optical adhesive sheet according to claim 1, wherein the thickness of the substrate is 150 μm or less. 如請求項1之光學用黏著片材，其中上述第1黏著劑層及/或上述第2黏著劑層含有丙烯酸系聚合物作為主劑。The optical adhesive sheet according to claim 1, wherein the first adhesive layer and / or the second adhesive layer contains an acrylic polymer as a main agent. 如請求項1之光學用黏著片材，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。The optical adhesive sheet 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之光學用黏著片材，其霧度為5%以下。For example, the haze of the adhesive sheet for optics of claim 1 is 5% or less. 如請求項1至7中任一項之光學用黏著片材，其中上述基材具有1500 nm以上之面內相位差。The optical adhesive sheet according to any one of claims 1 to 7, wherein the substrate has an in-plane phase difference of 1500 nm or more. 一種附黏著劑層之偏光膜，其具有如請求項1至8中任一項之光學用黏著片材與偏光膜之積層構造。A polarizing film with an adhesive layer has a laminated structure of an optical adhesive sheet and a polarizing film according to any one of claims 1 to 8. 一種液晶顯示裝置，其包含如請求項1至8中任一項之光學用黏著片材。A liquid crystal display device including the optical adhesive sheet according to any one of claims 1 to 8.
TW106121235A 2016-06-27 2017-06-26 Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display TWI730127B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP??2016-126415 2016-06-27
JP2016126415A JP6882857B2 (en) 2016-06-27 2016-06-27 Polarizing film with adhesive layer and liquid crystal display device

Publications (2)

Publication Number Publication Date
TW201819561A true TW201819561A (en) 2018-06-01
TWI730127B TWI730127B (en) 2021-06-11

Family

ID=60948474

Family Applications (1)

Application Number Title Priority Date Filing Date
TW106121235A TWI730127B (en) 2016-06-27 2017-06-26 Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display

Country Status (4)

Country Link
JP (1) JP6882857B2 (en)
KR (1) KR102390640B1 (en)
CN (1) CN107541149A (en)
TW (1) TWI730127B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6870930B2 (en) * 2016-07-05 2021-05-12 日東電工株式会社 Surface protective film
JP6870929B2 (en) * 2016-07-05 2021-05-12 日東電工株式会社 Double-sided adhesive tape for optics
JP2019191282A (en) * 2018-04-20 2019-10-31 日東電工株式会社 Polarizing plate with retardation layer and organic EL display device
WO2020050305A1 (en) 2018-09-04 2020-03-12 富士フイルム株式会社 Multilayer body, organic electroluminescent device and liquid crystal display device
JPWO2020158112A1 (en) * 2019-01-31 2021-10-21 日東電工株式会社 Polyester film and polarizing plate containing the polyester film
JP2021157068A (en) * 2020-03-27 2021-10-07 日東電工株式会社 Polyester film and polarizing plate comprising the same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070153162A1 (en) * 2005-12-30 2007-07-05 Wright Robin E Reinforced reflective polarizer films
DE102008004388A1 (en) * 2008-01-14 2009-07-16 Tesa Ag Foamed, in particular pressure-sensitive adhesive, method of production and use thereof
JP2009275060A (en) 2008-05-12 2009-11-26 Nitto Denko Corp Adhesive sheet, method for processing adherend using the adhesive sheet, and adhesive sheet-peeling device
JP2012078431A (en) 2010-09-30 2012-04-19 Sumitomo Chemical Co Ltd Liquid crystal panel and liquid crystal display device including the same
JP5817141B2 (en) 2010-09-30 2015-11-18 住友化学株式会社 Liquid crystal display
JP6508869B2 (en) * 2013-02-14 2019-05-08 日東電工株式会社 Pressure-sensitive adhesive composition, pressure-sensitive adhesive layer, pressure-sensitive adhesive sheet, optical member, and touch panel
JP6340765B2 (en) * 2013-08-21 2018-06-13 三菱ケミカル株式会社 Double-sided adhesive sheet and image display device
JP2015179498A (en) 2014-02-28 2015-10-08 富士フイルム株式会社 Layered body for touch panel, and adhesive sheet
JP2015200698A (en) 2014-04-04 2015-11-12 日東電工株式会社 Transparent resin layer, polarizing film with adhesive layer, and image display device
JP6580315B2 (en) * 2014-10-15 2019-09-25 日東電工株式会社 Optical film with double-sided pressure-sensitive adhesive, method for producing image display device using the same, and curl suppression method for optical film with double-sided pressure-sensitive adhesive
JP6538332B2 (en) * 2014-11-17 2019-07-03 日東電工株式会社 Optical double-sided adhesive sheet
JP6772837B2 (en) * 2014-12-03 2020-10-21 三菱ケミカル株式会社 Adhesive sheet laminate and image display device component laminate

Also Published As

Publication number Publication date
JP2018002756A (en) 2018-01-11
TWI730127B (en) 2021-06-11
KR20180001471A (en) 2018-01-04
CN107541149A (en) 2018-01-05
JP6882857B2 (en) 2021-06-02
KR102390640B1 (en) 2022-04-26

Similar Documents

Publication Publication Date Title
TWI730060B (en) Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display device
TWI730127B (en) Optical adhesive sheet, polarizing film with adhesive layer and liquid crystal display
KR102309118B1 (en) Optical film with adhesive on both sides and method for fabrication of image display device employing same, and method of suppressing curling of optical film with adhesive on both sides
CN108369305B (en) Polarizing film with adhesive layer and image display device
TW201307500A (en) Optical double-sided pressure-sensitive adhesive sheet
KR102630409B1 (en) Surface protective film
WO2021193721A1 (en) Light-emitting device
TWI744347B (en) Double-sided adhesive sheet
CN112433287A (en) Polarizing film with adhesive layer and image display device
WO2021193722A1 (en) Adhesive and use thereof
CN107163867B (en) Optical adhesive sheet, polarizing film with adhesive layer, and liquid crystal display device
KR20220156594A (en) adhesive optical film
JP2016020442A (en) Composition for transparent adhesive sheet, and transparent adhesive sheet
JP6803951B2 (en) An optical film with a double-sided adhesive, a method for manufacturing an image display device using the same, and a method for suppressing curl of the optical film with a double-sided adhesive.
TWI740975B (en) Double-sided adhesive tape for optics
JP7121785B2 (en) surface protection film
KR20240054237A (en) Optical double-sided adhesive tape
WO2022244886A1 (en) Adhesive sheet, optical layered body and image display device
KR20240054931A (en) Optical double-sided adhesive tape