TWI740975B - Double-sided adhesive tape for optics - Google Patents

Abstract

The present invention provides a double-sided optical adhesive tape suitable for realizing good hand-tearability and high secondary processability on one side with a polyester-based substrate on one side. The adhesive tape X of the present invention has a laminated structure including a substrate 10 as a transparent substrate, an adhesive layer 11, and an adhesive layer 12. The substrate 10 is a polyester-based substrate uniaxially extending in the width direction of the substrate, and is located between the adhesive layers 11 and 12 and has a thickness of 75 μm or more. The Elmendorf tear strength in the width direction of the substrate of the adhesive tape X is 0.5 N or less, and the Elmendorf tear strength in the machine direction of the substrate of the adhesive tape X is 1 N or more.

Description

Double-sided adhesive tape for optics

The present invention relates to a double-sided adhesive tape for optical use with light permeability.

In the technical field of flat panel displays, optical double-sided adhesive tapes are used in the manufacture of display devices. Specifically, when a display device such as a liquid crystal display or an input device such as a touch panel has a multilayer structure including various substrates or films, there are cases where the following is the case: in order to join adjacent specific parts within the multilayer structure, Or in order to fill the gaps between adjacent parts, use transparent double-sided adhesive tape. About this kind of double-sided optical adhesive tape, it is described in the following patent documents 1-3, for example. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 2012-78431 [Patent Document 2] Japanese Patent Laid-Open No. 2015-200698 [Patent Document 3] Japanese Patent Laid-Open No. 2016-26321 Bulletin

[Problems to be Solved by the Invention] As the base material of the above-mentioned optical double-sided adhesive tape, a polyester base material may be used in terms of excellent heat resistance, transparency, and dimensional stability. Regarding PET films, which are polyester-based substrates for optical applications such as optical double-sided adhesive tapes, it is known that in most cases, in the manufacturing process, the raw resin material is extruded into a film by the T-die method. After the film is formed, it undergoes a biaxial stretching process including the extension in the traveling direction or the machine direction (MD) and the extension in the width direction (TD) of the film. In addition, with regard to double-sided optical adhesive tapes, from the viewpoint of work efficiency and the like, there are cases where good tearability is required. The present invention was devised based on the above-mentioned circumstances, and its purpose is to provide a double-sided optical adhesive tape suitable for achieving good hand-tearability and high secondary processability on one side with a polyester-based substrate on one side. . [Technical Means to Solve the Problem] The optical double-sided adhesive tape provided by the present invention has a transparent substrate including a first adhesive layer, a second adhesive layer, and a transparent substrate between the first and second adhesive layers Layered structure. The transparent substrate is a polyester-based substrate that extends uniaxially in the width direction of the substrate and has a thickness of 75 μm or more. The term "polyester-based base material" refers to a base material such as a film or sheet containing a polyester-based resin at the largest weight ratio in the constituent material. The so-called uniaxially extending polyester-based substrate in the width direction of the substrate refers to the direction of travel of a film-like extruded body after the extrusion of the raw resin material in the manufacturing process of the polyester-based substrate Or a polyester-based substrate processed uniaxially in the width direction (TD) perpendicular to the machine direction (MD). The first adhesive layer and/or the second adhesive layer include, for example, at least selected from the group consisting of acrylic adhesives, urethane adhesives, silicone adhesives, and rubber adhesives A sort of. In this optical double-sided adhesive tape, the Elmendorf tear strength in the width direction of the substrate is 0.5 N or less, and the Elmendorf tear strength in the machine direction of the substrate is 1 N or more. The optical double-sided adhesive tape with the above-mentioned structure can adopt a sheet-like form with a release liner for covering and protecting the adhesive surface of each adhesive layer, or it can be used to adhere the optical double-sided adhesive tape. The tape and the release liner are arranged alternately. The release liner is wound into a roll. The transparent substrate of this optical double-sided adhesive tape is a polyester-based substrate as described above. Such a configuration is preferable for allowing the double-sided adhesive tape substrate and even the optical double-sided adhesive tape to have various characteristics that the polyester-based substrate easily exhibits, such as heat resistance, transparency, and dimensional stability. In addition, the transparent substrate of the double-sided adhesive tape for optics is a uniaxially stretched polyester-based substrate with a thickness of 75 μm or more in the width direction as described above. When the tearing strength of the double-sided adhesive tape such as the Emmendorf tear strength is strongly dominated by the mechanical properties of the substrate, this configuration is suitable for the double-sided adhesive tape for optical applications to realize the Emmendorf in the width direction of the substrate. The above-mentioned structure in which the doffer tear strength is 0.5 N or less, and the Emmendorf tear strength in the machine direction of the base material is 1 N or more. In addition, the double-sided adhesive tape for optics has the Emmendorf tear strength in the width direction of the substrate as described above, and the Emmendorf tear strength in the machine direction of the substrate is 1 N or more. Such a configuration is suitable for the present double-sided adhesive tape for optics to achieve good hand-tearability in the width direction of the substrate, where the Emmendorf tear strength is relatively remarkably low to 0.5 N or less. In addition, the composition of Emmendorf’s tearing strength in the mechanical direction of the substrate is more than 2 times the width of the substrate and 1 N or more is designed to increase the direction of tearing in the width direction of the substrate for the optical double-sided adhesive tape. Sexually better. Therefore, this configuration is preferable for the following situations: when the optical double-sided adhesive tape is attached to the adherend, the peeling force is applied to the mechanical direction of the substrate of the adhesive tape, Without tearing the adhesive tape, it can be properly peeled from the adherend. Specifically, it is preferable for the following cases: when the double-sided adhesive tape for optics is attached to the adherend and then peeled off temporarily and then attached again (secondary processing operation), the peeling force is applied to The mechanical direction of the base material of the adhesive tape can be properly peeled from the adherend without tearing the adhesive tape. In addition to the width direction of the substrate, the optical double-sided adhesive tape that is easily torn in the mechanical direction of the substrate has the following tendency: it is easy to break during the peeling in the secondary processing operation, and it is difficult to properly peel off from the adherend. The optical double-sided adhesive tape that has broken can not be used for re-bonding. In contrast, the present optical double-sided adhesive tape has a substrate width direction Emmendorf tear strength that is sufficiently larger than the substrate width direction Emmendorf tear strength suitable for achieving good hand-tearability in the substrate width direction. The tear strength is therefore suitable for proper peeling from the adherend without tearing during secondary processing operations. As mentioned above, this optical double-sided adhesive tape is suitable for having a polyester-based substrate on one side and achieving good hand-tearability and high secondary processability at the same time. Preferably, the thickness of the first adhesive layer is 5 μm or more, and the thickness of the second adhesive layer is 5 μm or more. Such a structure is preferable in terms of achieving sufficient adhesion of the optical double-sided adhesive tape to the adherend. Preferably, the thickness direction haze of the optical double-sided adhesive tape is 3% or less. Such a configuration is preferable for optical adhesive tapes that require transparency.

×150 mm ・管柱溫度(測定溫度)：40℃ ・溶離液：四氫呋喃(THF) ・流量：0.4 mL/分鐘 ・樣品注入量：20 μL ・樣品濃度：約2.0 g/L(四氫呋喃溶液) ・標準試樣：聚苯乙烯 ・檢測器：示差折射計(RI) 黏著劑層11、12亦可分別含有矽烷偶合劑。作為矽烷偶合劑，例如可列舉：γ-縮水甘油氧基丙基三甲氧基矽烷、γ-縮水甘油氧基丙基三乙氧基矽烷、γ-胺基丙基三甲氧基矽烷、及N-苯基-胺基丙基三甲氧基矽烷。作為矽烷偶合劑，亦可列舉商品名「KBM-403」(信越化學工業股份有限公司製造)等市售品。作為矽烷偶合劑，較佳為γ-縮水甘油氧基丙基三甲氧基矽烷。 於黏著劑層11及/或黏著劑層12含有矽烷偶合劑之情形時，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，黏著劑層中之矽烷偶合劑之含量較佳為0.01重量份以上，更佳為0.02重量份以上。又，相對於丙烯酸系聚合物100重量份，黏著劑層中之矽烷偶合劑之含量較佳為1重量份以下，更佳為0.5重量份以下。與矽烷偶合劑之含量有關的該構成係於使包含該矽烷偶合劑所形成之黏著劑層實現加濕條件下之較高之接著性、尤其是對玻璃之較高之接著性的方面而言較佳。 黏著劑層11、12亦可分別含有紫外線吸收劑。紫外線吸收劑係可高效率地吸收紫外線且可將所吸收之能量轉換為熱或紅外線等並釋出之化學種。作為此種紫外線吸收劑，例如可列舉：苯并三唑系紫外線吸收劑、羥基苯基三𠯤系紫外線吸收劑、水楊酸酯系紫外線吸收劑、二苯甲酮系紫外線吸收劑、氧基二苯甲酮系紫外線吸收劑、及氰基丙烯酸酯系紫外線吸收劑。黏著劑層11及/或黏著劑層12可含有一種紫外線吸收劑，亦可含有兩種以上之紫外線吸收劑。 作為苯并三唑系紫外線吸收劑，例如可列舉：2-(2-羥基-5-第三丁基苯基)-2H-苯并三唑(商品名「TINUVIN PS」，BASF公司製造)、苯丙酸3-(2H-苯并三唑-2-基)-5-(1,1-二甲基乙基)-4-羥基之碳數7～9之烷基酯(商品名「TINUVIN 384-2」，BASF公司製造)、3-[3-第三丁基-4-羥基-5-(5-氯-2H-苯并三唑-2-基)苯基]丙酸辛酯及3-[3-第三丁基-4-羥基-5-(5-氯-2H-苯并三唑-2基)苯基]丙酸2-乙基己酯之混合物(商品名「TINUVIN 109」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4,6-雙(1-甲基-1-苯基乙基)苯酚(商品名「TINUVIN 900」，BASF公司製造)、2-(2H-苯并三唑-2-基)-6-(1-甲基-1-苯基乙基)-4-(1,1,3,3-四甲基丁基)苯酚(商品名「TINUVIN 928」，BASF製造)、3-(3-(2H-苯并三唑-2-基)-5-第三丁基-4-羥基苯基)丙酸甲酯與聚乙二醇300之反應產物(商品名「TINUVIN 1130」，BASF公司製造)、2-(2H-苯并三唑-2-基)-對甲酚(商品名「TINUVIN P」，BASF公司製造)、2(2H-苯并三唑-2-基)-4,6-雙(1-甲基-1-苯基乙基)苯酚(商品名「TINUVIN 234」，BASF公司製造)、2-[5-氯-2H-苯并三唑-2-基]-4-甲基-6-(第三丁基)苯酚(商品名「TINUVIN 326」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4,6-二-第三戊基苯酚(商品名「TINUVIN 328」，BASF公司製造)、2-(2H-苯并三唑-2-基)-4-(1,1,3,3-四甲基丁基)苯酚(商品名「TINUVIN 329」，BASF公司製造)、2,2'-亞甲基雙[6-(2H-苯并三唑-2-基)-4-(1,1,3,3-四甲基丁基)苯酚](商品名「TINUVIN 360」，BASF公司製造)、2-(2H-苯并三唑-2-基)-6-十二烷基-4-甲基苯酚(商品名「TINUVIN 571」，BASF公司製造)、2-[2-羥基-3-(3,4,5,6-四氫鄰苯二甲醯亞胺-甲基)-5-甲基苯基]苯并三唑(商品名「Sumisorb 250」，住友化學股份有限公司製造)、及2,2'-亞甲基雙[6-(2H-苯并三唑-2-基)-4-第三辛基苯酚](商品名「Adekastab LA-31」，ADEKA股份有限公司製造)。 作為羥基苯基三𠯤系紫外線吸收劑，例如可列舉：2-(4,6-雙(2,4-二甲基苯基)-1,3,5-三𠯤-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)-1,3,5-三𠯤-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)-1,3,5-三𠯤與(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)-1,3,5-三𠯤(商品名「TINUVIN 460」，BASF公司製造)、2-(4,6-二苯基-1,3,5-三𠯤-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-1,3,5-三𠯤-2-基)-5-[2-(2-乙基己醯氧基)乙氧基]-苯酚(商品名「Adekastab LA-46」，ADEKA股份有限公司製造)、及2-(2-羥基-4-[1-辛氧基羰基乙氧基]苯基)-4,6-雙(4-苯基苯基)-1,3,5-三𠯤(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、羥基苯基三𠯤系紫外線吸收劑、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-1,3,5-三𠯤、對苯二甲酸雙[2-第三丁基-4-甲基-6-(2-羥基-3-第三丁基-5-甲基苄基)苯基]酯、3,9-雙{2-[3-(3-第三丁基-4-羥基-5-甲基苯基)丙醯氧基]-1,1-二甲基乙基}-2,4,8,10-四氧雜螺[5.5]十一烷、及3,9-雙{2-[3-(3,5-二-第三丁基-4-羥基苯基)丙醯氧基]-1,1-二甲基乙基}-2,4,8,10-四氧雜螺[5.5]十一烷。 作為磷系光穩定劑，例如可列舉：亞磷酸三(壬基苯基)酯、亞磷酸三(2,4-二-第三丁基苯基)酯、亞磷酸三[2-第三丁基-4-(3-第三丁基-4-羥基-5-甲基苯基硫基)-5-甲基苯基]酯、亞磷酸三癸酯、亞磷酸辛基二苯酯、亞磷酸二(癸基)單苯酯、二(十三烷基)季戊四醇二亞磷酸酯、二硬脂基季戊四醇二亞磷酸酯、二(壬基苯基)季戊四醇二亞磷酸酯、雙(2,4-二-第三丁基苯基)季戊四醇二亞磷酸酯、雙(2,6-二-第三丁基-4-甲基苯基)季戊四醇二亞磷酸酯、雙(2,4,6-三-第三丁基苯基)季戊四醇二亞磷酸酯、四(十三烷基)亞異丙基二苯酚二亞磷酸酯、四(十三烷基)-4,4'-亞正丁基雙(2-第三丁基-5-甲基苯酚)二亞磷酸酯、六(十三烷基)-1,1,3-三(2-甲基-4-羥基-5-第三丁基苯基)丁烷三亞磷酸酯、四(2,4-二-第三丁基苯基)伸聯苯基二亞膦酸二酯、9,10-二氫-9-氧雜-10-磷雜菲-10-氧化物、及三(2-[(2,4,8,10-四-第三丁基二苯并[d,f][1,3,2]二氧雜磷雜環庚烯-6-基)氧基]乙基)胺。 作為硫醚系光穩定劑，例如可列舉：硫代二丙酸二月桂酯、硫代二丙酸二肉豆蔻酯、及硫代二丙酸二硬脂酯等硫代二丙酸二烷基酯化合物，以及四[亞甲基(3-十二烷基硫基)丙酸酯]甲烷等多元醇之β-烷基巰基丙酸酯化合物。 作為胺系光穩定劑，例如可列舉：丁二酸二甲酯與4-羥基-2,2,6,6-四甲基-1-哌啶乙醇之聚合物(商品名「TINUVIN 622」，BASF公司製造)、該聚合物與N,N',N'',N'''-四-(4,6-雙-(丁基-(N-甲基-2,2,6,6-四甲基哌啶-4-基)胺基)-三𠯤-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-1,3,5-三𠯤-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-1,3,5-三𠯤之反應產物與2-胺基乙醇之反應產物(商品名「TINUVIN 152」，BASF公司製造)、癸二酸雙(1,2,2,6,6-五甲基-4-哌啶基)酯及癸二酸甲基1,2,2,6,6-五甲基-4-哌啶酯之混合物(商品名「TINUVIN 292」，BASF公司製造)、以及1,2,3,4-丁烷四羧酸與1,2,2,6,6-五甲基-4-哌啶醇及3,9-雙(2-羥基-1,1-二甲基乙基)-2,4,8,10-四氧雜螺[5.5]十一烷之混合酯化物(商品名「Adekastab LA-63P」，ADEKA股份有限公司製造)。作為胺系穩定劑，尤佳為受阻胺系穩定劑。 於黏著劑層11及/或黏著劑層12含有光穩定劑之情形時，關於黏著劑層中之光穩定劑之含量，就使黏著劑層實現充分之耐光性之觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為0.1重量份以上，更佳為0.2重量份以上。又，關於黏著劑層中之光穩定劑之含量，就於黏著劑層中抑制由光穩定劑引起之著色而實現較高之透明性之觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為5重量份以下，更佳為3重量份以下。 黏著劑層11及/或黏著劑層12所含有之黏著劑或丙烯酸系聚合物亦可利用並非上述共聚合性交聯劑之交聯劑進行交聯。可應用由該交聯劑所致之黏著劑或丙烯酸系聚合物之交聯，而調整黏著劑層11及/或黏著劑層12之凝膠分率。作為此種交聯劑，例如可列舉：異氰酸酯系交聯劑、環氧系交聯劑、三聚氰胺系交聯劑、過氧化物系交聯劑、脲系交聯劑、金屬烷氧化物系交聯劑、金屬螯合物系交聯劑、金屬鹽系交聯劑、碳二醯亞胺系交聯劑、㗁唑啉系交聯劑、氮丙啶系交聯劑、及胺系交聯劑。黏著劑層11及/或黏著劑層12可含有一種該交聯劑，亦可含有兩種以上之該交聯劑。於本實施形態中，較佳為使用異氰酸酯系交聯劑及/或環氧系交聯劑。 作為異氰酸酯系交聯劑，例如可列舉：低級脂肪族聚異氰酸酯類、脂環式聚異氰酸酯類、及芳香族聚異氰酸酯類。作為低級脂肪族聚異氰酸酯類，例如可列舉：1,2-伸乙基二異氰酸酯、1,4-伸丁基二異氰酸酯、及1,6-六亞甲基二異氰酸酯。作為脂環式聚異氰酸酯類，例如可列舉：伸環戊基二異氰酸酯、伸環己基二異氰酸酯、異佛爾酮二異氰酸酯、氫化甲苯二異氰酸酯、及氫化二甲苯二異氰酸酯。作為芳香族聚異氰酸酯類，例如可列舉：2,4-甲苯二異氰酸酯、2,6-甲苯二異氰酸酯、4,4'-二苯基甲烷二異氰酸酯、及苯二甲基二異氰酸酯。又，作為異氰酸酯系交聯劑，亦可列舉：三羥甲基丙烷/甲苯二異氰酸酯加成物(商品名「Coronate L」，Nippon Polyurethane Industry股份有限公司製造)、三羥甲基丙烷/六亞甲基二異氰酸酯加成物(商品名「Coronate HL」，Nippon Polyurethane Industry股份有限公司製造)、三羥甲基丙烷/苯二甲基二異氰酸酯加成物(商品名「Takenate D-110N」，三井化學股份有限公司製造)等市售品。 作為環氧系交聯劑(多官能環氧化合物)，例如可列舉：N,N,N',N'-四縮水甘油基-間苯二甲胺、二縮水甘油基苯胺、1,3-雙(N,N-二縮水甘油基胺基甲基)環己烷、1,6-己二醇二縮水甘油醚、新戊二醇二縮水甘油醚、乙二醇二縮水甘油醚、丙二醇二縮水甘油醚、聚乙二醇二縮水甘油醚、聚丙二醇二縮水甘油醚、山梨糖醇聚縮水甘油醚、甘油聚縮水甘油醚、季戊四醇聚縮水甘油醚、聚甘油聚縮水甘油醚、山梨糖醇酐聚縮水甘油醚、三羥甲基丙烷聚縮水甘油醚、己二酸二縮水甘油酯、鄰苯二甲酸二縮水甘油酯、三(2-羥基乙基)異三聚氰酸三縮水甘油酯、間苯二酚二縮水甘油醚、及雙酚-S-二縮水甘油醚。又，作為環氧系交聯劑，亦可列舉具有兩個以上之環氧基之環氧系樹脂。此外，作為環氧系交聯劑，亦可列舉商品名「Tetrad C」(三菱瓦斯化學股份有限公司製造)等市售品。 於黏著劑層11及/或黏著劑層12含有用以將丙烯酸系聚合物間交聯的以上般之交聯劑之情形時，關於黏著劑層中之該交聯劑之含量，就使黏著劑層實現對被接著體之充分之接著可靠性的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為0.001重量份以上，更佳為0.01重量份以上。又，關於黏著劑層中之該交聯劑之含量，就使黏著劑層表現出適度之柔軟性而實現良好之黏著力的觀點而言，相對於黏著劑層中之黏著劑或丙烯酸系聚合物100重量份，較佳為10重量份以下，更佳為5重量份以下。 黏著劑層11、12亦可分別視需要進而含有交聯促進劑、增黏樹脂、抗老化劑、填充劑、顏料或染料等著色劑、抗氧化劑、鏈轉移劑、塑化劑、軟化劑、界面活性劑、及抗靜電劑等添加劑。作為增黏樹脂，例如可列舉：松香衍生物、聚萜烯樹脂、石油樹脂、及油溶性苯酚。 關於黏著劑層11之厚度，就使黏著帶X實現對黏著劑層11側之被接著體的充分之黏著力的觀點而言，較佳為5 μm以上，更佳為10 μm以上，更佳為15 μm以上。又，就形成之容易度之觀點而言，黏著劑層11之厚度較佳為1000 μm以下，更佳為900 μm以下，更佳為800 μm以下。 關於黏著劑層12之厚度，就使黏著帶X實現對黏著劑層12側之被接著體的充分之黏著力的觀點而言，較佳為5 μm以上，更佳為10 μm以上，更佳為15 μm以上。又，就形成之容易度之觀點而言，黏著劑層11之厚度較佳為1000 μm以下，更佳為900 μm以下，更佳為800 μm以下。 對於具有包含以上般之基材10及黏著劑層11、12之積層構造的黏著帶X而言，基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上。關於黏著帶X之基材寬度方向之艾勉道夫撕裂強度，較佳為0.45 N以下，更佳為0.4 N以下，更佳為0.3 N以下。關於黏著帶X之基材機械方向之艾勉道夫撕裂強度，較佳為1.1 N以上，更佳為1.3 N以上，更佳為1.5 N以上。艾勉道夫撕裂強度係設為依據JIS K 7128-2而測得之值。 又，光學用黏著帶X之厚度方向之霧度較佳為3%以下，更佳為2.5%以下，更佳為2%以下，更佳為1.5%以下，更佳為1%以下。霧度係設為依據JIS K 7136而測得之值。關於黏著帶X，可見光波長範圍內之全光線透過率例如為85%以上。全光線透過率係設為依據JIS K 7361-1而測得之值。 黏著帶X亦可以將黏著劑層11之黏著面11a被覆之方式設有剝離襯墊(隔離膜)。黏著帶X亦可以將黏著劑層12之黏著面12a被覆之方式設有剝離襯墊(隔離膜)。剝離襯墊係用以進行保護以使黏著帶X之黏著劑層11、12不露出之要素，且係於將黏著帶X貼合於被接著體時自黏著帶X剝離。作為剝離襯墊，例如可列舉：具有剝離處理層之基材、包含氟聚合物之低接著性基材、及包含無極性聚合物之低接著性基材。剝離襯墊之表面亦可實施脫模處理、防污處理、或抗靜電處理。剝離襯墊之厚度例如為5～200 μm。黏著帶X具體而言，可採取帶有將黏著劑層11、12之黏著面11a、12a被覆的剝離襯墊之片材狀形態，亦可採取以將黏著帶X與剝離襯墊交替配置之方式帶有剝離襯墊並經捲繞成捲狀之形態。 以上般之構成之黏著帶X例如可藉由分別形成黏著劑層11、12後，分別對基材10貼合黏著劑層11、12而製造。黏著劑層11例如可藉由以下方式形成：於特定之剝離襯墊上塗佈黏著劑層11形成用之黏著劑組合物而形成黏著劑組合物層，於該黏著劑組合物層上進而積層剝離襯墊，使黏著劑組合物於該剝離襯墊間硬化。另一方面，黏著劑層12例如可藉由以下方式形成：於特定之剝離襯墊上塗佈黏著劑層12形成用之黏著劑組合物而形成黏著劑組合物層，於該黏著劑組合物層上進而積層剝離襯墊，使黏著劑組合物於該剝離襯墊間硬化。 作為黏著劑層11形成用之黏著劑組合物及/或黏著劑層12形成用之黏著劑組合物，例如可使用可藉由活性能量線之照射進行聚合反應而硬化之黏著劑組合物。即，黏著劑層11及/或黏著劑層12例如為活性能量線硬化型黏著劑組合物之硬化物。丙烯酸系黏著劑層形成用之活性能量線硬化型黏著劑組合物至少含有用以形成丙烯酸系聚合物之單體、低聚物、及光聚合起始劑。該組合物中之單體及低聚物可以用以形成丙烯酸系聚合物的特定組成之單體混合物之所謂部分聚合物的形式提供。又，該黏著劑組合物亦可含有視需要而採用之其他成分作為所形成之黏著劑層的成分。作為照射至活性能量線硬化型黏著劑組合物以使黏著劑層硬化的活性能量線，例如可列舉：紫外線、α射線、β射線、γ射線、中子束、及電子束，較佳為採用紫外線。對於受到活性能量線之照射的丙烯酸系黏著劑層形成用之活性能量線硬化型黏著劑組合物而言，經由光聚合起始劑之活化而產生起始反應，進行聚合反應以形成丙烯酸系聚合物。若採用紫外線照射等活性能量線照射作為黏著劑層形成用之硬化性黏著劑組合物之硬化方法，則即便於該黏著劑組合物之塗膜相對較厚之情形時，亦容易獲得經適當硬化之黏著劑層。因此，黏著劑層11為活性能量線硬化型黏著劑組合物之硬化物之構成對於實現即便相對較厚亦經充分硬化之黏著劑層11的方面而言係較佳。黏著劑層12為活性能量線硬化型黏著劑組合物之硬化物之構成對於實現即便相對較厚亦經充分硬化之黏著劑層12的方面而言係較佳。 作為上述光聚合起始劑，例如可列舉：安息香醚系光聚合起始劑、苯乙酮系光聚合起始劑、α-酮醇系光聚合起始劑、芳香族磺醯氯系光聚合起始劑、光活性肟系光聚合起始劑、安息香系光聚合起始劑、苯偶醯系光聚合起始劑、二苯甲酮系光聚合起始劑、縮酮系光聚合起始劑、及9-氧硫

系光聚合起始劑。作為安息香醚系光聚合起始劑，例如可列舉：安息香甲醚、安息香乙醚、安息香丙醚、安息香異丙醚、安息香異丁醚、及2,2-二甲氧基-1,2-二苯基乙烷-1-酮。作為苯乙酮系光聚合起始劑，例如可列舉：2,2-二乙氧基苯乙酮、2,2-二甲氧基-2-苯基苯乙酮、1-羥基環己基苯基酮(α-羥基環己基苯基酮)、4-苯氧基二氯苯乙酮、及4-(第三丁基)二氯苯乙酮。作為α-酮醇系光聚合起始劑，例如可列舉2-甲基-2-羥基苯丙酮、及1-[4-(2-羥基乙基)苯基]-2-甲基丙烷-1-酮。作為芳香族磺醯氯系光聚合起始劑，例如可列舉2-萘磺醯氯。作為光活性肟系光聚合起始劑，例如可列舉1-苯基-1,2-丙烷二酮-2-(O-乙氧羰基)-肟。作為安息香系光聚合起始劑，例如可列舉安息香。作為苯偶醯系光聚合起始劑，例如可列舉苯偶醯。作為二苯甲酮系光聚合起始劑，例如可列舉二苯甲酮、苯甲醯基苯甲酸、3,3'-二甲基-4-甲氧基二苯甲酮、及聚乙烯基二苯甲酮。作為縮酮系光聚合起始劑，例如可列舉苯偶醯二甲基縮酮。作為9-氧硫

系光聚合起始劑，例如可列舉：9-氧硫

、2-氯9-氧硫𠮿

、2-甲基9-氧硫

、2,4-二甲基9-氧硫

、異丙基9-氧硫

、2,4-二異丙基9-氧硫

、及十二烷基9-氧硫

。活性能量線硬化型黏著劑組合物中之光聚合起始劑之含量例如為0.01～3重量%。 作為黏著劑層11形成用之黏著劑組合物及/或黏著劑層12形成用之黏著劑組合物，亦可使用已含有作為黏著劑之丙烯酸系聚合物並藉由例如加熱乾燥而可進行硬化之溶劑型黏著劑組合物或乳液型黏著劑組合物。該組合物亦可含有視需要而採用之其他成分作為所形成之黏著劑層之成分。該黏著劑組合物中之丙烯酸系聚合物可使丙烯酸系聚合物形成用之原料單體成分進行聚合而獲得。作為聚合方法，例如可列舉：溶液聚合、乳化聚合、及塊狀聚合。於進行溶液聚合時，可使用例如芳香族烴類、脂肪族烴類、脂環式烴類、酯類、及酮類作為溶劑。作為芳香族烴類之溶劑，例如可列舉甲苯及苯。作為脂肪族烴類之溶劑，例如可列舉正己烷及正庚烷。作為脂環式烴類之溶劑，例如可列舉環己烷及甲基環己烷。作為酯類之溶劑，例如可列舉乙酸乙酯及乙酸正丁酯。作為酮類之溶劑，例如可列舉甲基乙基酮及甲基異丁基酮。於溶液聚合中，可使用一種溶劑，亦可使用兩種以上之溶劑。 於為了獲得丙烯酸系聚合物而使原料單體成分進行聚合時，可使用聚合起始劑。視聚合反應之種類不同，可使用例如光聚合起始劑或熱聚合起始劑。於聚合時，可使用一種聚合起始劑，亦可使用兩種以上之聚合起始劑。 作為光聚合起始劑，例如可列舉：上述安息香醚系光聚合起始劑、苯乙酮系光聚合起始劑、α-酮醇系光聚合起始劑、芳香族磺醯氯系光聚合起始劑、光活性肟系光聚合起始劑、安息香系光聚合起始劑、苯偶醯系光聚合起始劑、二苯甲酮系光聚合起始劑、縮酮系光聚合起始劑、及9-氧硫

系光聚合起始劑。關於光聚合起始劑之使用量，例如相對於單體成分總量(100重量份)而為0.01～3重量份。 作為熱聚合起始劑，例如可列舉：偶氮系聚合起始劑、過氧化物系聚合起始劑、及氧化還原系聚合起始劑。作為偶氮系聚合起始劑，例如可列舉：2,2'-偶氮雙異丁腈、2,2'-偶氮雙-2-甲基丁腈、2,2'-偶氮雙(2-甲基丙酸)二甲酯、及4,4'-偶氮雙-4-氰基戊酸。作為過氧化物系聚合起始劑，例如可列舉過氧化苯甲醯及過氧化順丁烯二酸第三丁酯。關於熱聚合起始劑之使用量，例如相對於單體成分總量(100重量份)而為0.05～0.3重量份。 於用以獲得上述丙烯酸系聚合物之聚合時，為了調整丙烯酸系聚合物之分子量，可使用鏈轉移劑。作為鏈轉移劑，例如可列舉：α-硫甘油、2-巰基乙醇、2,3-二巰基-1-丙醇、辛硫醇、第三壬基硫醇、十二硫醇(月桂硫醇)、第三-十二硫醇、縮水甘油基硫醇、巰基乙酸、巰基乙酸甲酯、巰基乙酸乙酯、巰基乙酸丙酯、巰基乙酸丁酯、巰基乙酸第三丁酯、巰基乙酸2-乙基己酯、巰基乙酸辛酯、巰基乙酸異辛酯、巰基乙酸癸酯、及巰基乙酸十二烷基酯。作為鏈轉移劑，可使用一種鏈轉移劑，亦可使用兩種以上之鏈轉移劑。於本實施形態中，作為鏈轉移劑，較佳為使用α-硫甘油。關於鏈轉移劑之使用量，例如相對於用以獲得丙烯酸系聚合物之單體成分總量(100重量份)而為0.01～0.5重量份。 於活性能量線硬化型黏著劑組合物、或溶劑型黏著劑組合物、乳液型黏著劑組合物等黏著劑層形成用之黏著劑組合物包含上述丙烯酸系低聚物的情形時，該低聚物可使特定組成之原料單體成分進行聚合而獲得。作為聚合方法，例如可列舉：溶液聚合、乳化聚合、及塊狀聚合。作為用以進行溶液聚合之溶劑，可列舉上文中作為可用於用以獲得丙烯酸系聚合物之溶液聚合之溶劑而描述者。於該溶液聚合中，可使用一種溶劑，亦可使用兩種以上之溶劑。又，於為了獲得上述低聚物而使原料單體成分進行聚合時，可使用聚合起始劑。作為該聚合起始劑，可列舉上文中作為可用於用以獲得丙烯酸系聚合物之聚合之聚合起始劑而描述的光聚合起始劑或熱聚合起始劑。於聚合時，可使用一種聚合起始劑，亦可使用兩種以上之聚合起始劑。 例如以上述方式製造之黏著帶X所具有之基材10如上述般為聚酯系基材。此種構成係對於使雙面黏著帶基材甚至黏著帶X享有耐熱性、或透明性、尺寸穩定性等聚酯系基材容易表現出之各種特性而言較佳。 又，黏著帶X所具有之基材10如上述般為寬度方向單軸延伸聚酯系基材。該基材10之厚度如上述般為75 μm以上，較佳為80 μm以上。該基材10之厚度如上述般較佳為150 μm以下，更佳為125 μm以下。雙面黏著帶之艾勉道夫撕裂強度等撕裂強度受到基材之機械特性之強烈支配之情況下，該等構成係適於使黏著帶X實現基材寬度方向之艾勉道夫撕裂強度為0.5 N以下，且基材機械方向之艾勉道夫撕裂強度為1 N以上的上述構成。 此外，黏著帶X之基材寬度方向之艾勉道夫撕裂強度如上述般為0.5 N以下，較佳為0.45 N以下，更佳為0.4 N以下，更佳為0.3 N以下。並且，黏著帶X之基材機械方向之艾勉道夫撕裂強度如上述般為1 N以上，較佳為1.1 N以上，更佳為1.3 N以上，更佳為1.5 N以上。該等構成係適於使黏著帶X實現艾勉道夫撕裂強度相對顯著地低至0.5 N以下的基材寬度方向上之良好手撕性。而且，艾勉道夫撕裂強度於基材機械方向上為基材寬度方向之2倍以上的構成係對於使黏著帶X提高基材寬度方向上之撕裂之指向性而言較佳。因此，該構成係對於以下情況而言較佳：於處於將黏著帶X貼合於被接著體之狀態下之情形時，使剝離力作用於黏著帶X之基材機械方向，在不撕裂該黏著帶X之情況下使其自被接著體適當地剝離。具體而言係對於以下情況而言較佳：於將黏著帶X貼合於被接著體後暫且剝離並再次進行貼合之作業(二次加工作業)時，使剝離力作用於黏著帶X之基材機械方向，在不撕裂該黏著帶X之情況下使其自被接著體適當地剝離。除基材寬度方向以外於基材機械方向上亦容易被撕裂之光學用雙面黏著帶存在以下傾向：於二次加工作業中之剝離時容易破裂，難以適當地剝離。產生了破裂之光學用雙面黏著帶無法用於再次之貼合。相對於此，黏著帶X具有與適於實現基材寬度方向上之良好手撕性的基材寬度方向艾勉道夫撕裂強度相比充分大之基材機械方向艾勉道夫撕裂強度，因此適於在二次加工作業時，使剝離力作用於基材機械方向，在不撕裂之情況下適當地剝離。 如上所述，黏著帶X係適於一面具有聚酯系基材一面一併實現良好之手撕性與較高之二次加工性。 黏著帶X之基材10之面內相位差如上述般較佳為1500 nm以上，更佳為3000 nm以上，更佳為6000 nm以上。此種構成係對於以下情況而言較佳：於在液晶顯示裝置中以填充形成顯示畫面之最前面之透明罩與裝置內之液晶面板之間的方式設有黏著帶X之情形時，例如抑制經由偏光太陽眼鏡等帶偏光功能之透鏡視認該顯示畫面時產生所謂消隱現象。又，存在以下傾向：基材10之面內相位差越大，於液晶顯示裝置中以填充透明罩與液晶面板之間的方式設有黏著帶X之情形時，例如於經由偏光太陽眼鏡等帶偏光功能之透鏡視認該顯示畫面時所謂顏色不均現象越得到抑制。 [實施例] 以下，根據實施例對本發明更詳細地進行說明，但本發明並不限定於該等實施例。 [丙烯酸系低聚物之製造例] 於反應容器內，將包含甲基丙烯酸二環戊酯(DCPMA)60重量份、甲基丙烯酸甲酯(MMA)40重量份、作為鏈轉移劑之α-硫甘油3.5重量份、及作為聚合溶劑之甲苯100重量份之混合物於70℃下、於氮氣氛圍下攪拌1小時。繼而，將作為聚合起始劑之2,2'-偶氮雙異丁腈0.2重量份添加至反應容器內之混合物中而製備反應溶液，於70℃下進行2小時反應。繼而，於80℃下進行2小時反應。其後，將反應容器內之反應溶液置於130℃之溫度氛圍下，自該反應溶液中將甲苯、鏈轉移劑、及未反應單體乾燥去除。藉此，獲得固體狀之丙烯酸系低聚物。該丙烯酸系低聚物之重量平均分子量(Mw)為5.1×10³ 。 [丙烯酸系黏著劑組合物C1之製備例] 於含有丙烯酸2-乙基己酯(2EHA)78重量份、N-乙烯基-2-吡咯啶酮(NVP)18重量份、及丙烯酸2-羥基乙酯(HEA)4重量份之單體混合物中添加第1光聚合起始劑(商品名「Irgacure 651」，BASF公司製造)0.035重量份及第2光聚合起始劑(商品名「Irgacure 184」，BASF公司製造)0.035重量份後，對該混合物使用黏度測定裝置測定黏度，並且使用紫外線照射裝置照射紫外線直至該混合物之黏度成為約20 Pa・s為止。於黏度測定中，裝置之轉子旋轉速度係設為10 rpm，測定溫度係設為30℃。藉此，獲得混合物中之單體成分之一部分聚合所得之部分聚合物即預聚物組合物(含有未經聚合反應之單體成分)。然後，將該預聚物組合物100重量份、上述丙烯酸系低聚物11.8重量份、丙烯酸2-羥基乙酯(HEA)17.6重量份、1,6-己二醇二丙烯酸酯(HDDA)0.294重量份、及矽烷偶合劑(商品名「KBM-403」，信越化學工業股份有限公司製造)0.353重量份混合，獲得丙烯酸系黏著劑組合物(丙烯酸系黏著劑組合物C1)。 [丙烯酸系黏著劑組合物C2之製備例] 於安裝有環流冷凝器、氮氣導入管、攪拌機、及溫度計之燒瓶(反應容器)內，將包含丙烯酸正丁酯(BA)100重量份、丙烯酸(AA)5重量份、丙烯酸2-羥基乙酯(HEA)0.075重量份、作為聚合起始劑之過氧化苯甲醯(商品名「Nyper BW」，日本油脂股份有限公司製造)0.2重量份、及作為聚合溶劑之乙酸乙酯205重量份的混合物於氮氣氛圍下平穩地攪拌，並且於63℃下進行4小時反應。藉此，獲得以約35重量%之濃度含有丙烯酸系聚合物之溶液(丙烯酸系聚合物溶液)。然後，以丙烯酸系聚合物濃度成為29重量%之方式利用乙酸乙酯將丙烯酸系聚合物溶液稀釋後，於該丙烯酸系聚合物溶液中相對於丙烯酸系聚合物100重量份而添加0.6重量份之三羥甲基丙烷/甲苯二異氰酸酯加成物(商品名「Coronate L」，Nippon Polyurethane Industry股份有限公司製造)與0.075重量份之矽烷偶合劑(商品名「KBM-403」，信越化學工業股份有限公司製造)，於25℃下進行約1分鐘混合，獲得溶劑型之丙烯酸系黏著劑組合物(丙烯酸系黏著劑組合物C2)。 [實施例1] ＜第1黏著劑層之形成＞ 於聚對苯二甲酸乙二酯(PET)系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)上塗佈上述丙烯酸系黏著劑組合物C1，形成黏著劑組合物層。繼而，於該黏著劑組合物層上進而積層PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)，被覆該黏著劑組合物層而阻斷氧。如此，獲得具有[剝離襯墊/黏著劑組合物層/剝離襯墊]之積層構成之積層體(積層體L1')。繼而，對該積層體L1'使用黑光燈(東芝股份有限公司製造)自其一個剝離襯墊之側照射照度3 mW/cm² 之紫外線300秒鐘。藉此使積層體L1'之黏著劑組合物層硬化而製成黏著劑層(第1黏著劑層)，獲得具有[剝離襯墊/黏著劑層(第1黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L1)。積層體L1中之第1黏著劑層之厚度為100 μm。 ＜第2黏著劑層之形成＞ 於PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)上塗佈上述丙烯酸系黏著劑組合物C1，形成黏著劑組合物層。繼而，於該黏著劑組合物層上進而積層PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)，被覆該黏著劑組合物層而阻斷氧。如此，獲得具有[剝離襯墊/黏著劑組合物層/剝離襯墊]之積層構成之積層體(積層體L2')。繼而，對該積層體L2'使用黑光燈(東芝股份有限公司製造)自其一個剝離襯墊之側照射照度3 mW/cm² 之紫外線300秒鐘。藉此使積層體L2'之黏著劑組合物層硬化而製成黏著劑層(第2黏著劑層)，獲得具有[剝離襯墊/黏著劑層(第2黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L2)。積層體L2中之第2黏著劑層之厚度為500 μm。 ＜光學用雙面黏著帶之製作＞ 準備對厚度80 μm之聚對苯二甲酸乙二酯膜(商品名「COSMOSHINE SRF」，面內相位差8400，東洋紡股份有限公司製造)之兩面實施電暈處理所得之膜(膜F₁ )，自上述積層體L1(剝離襯墊/第1黏著劑層/剝離襯墊)將一個剝離襯墊剝離後，經由藉由該剝離而露出之第1黏著劑層表面，將單側附帶剝離襯墊之第1黏著劑層貼合於膜F₁ 之一個面。藉此，獲得具有[剝離襯墊/第1黏著劑層/膜F₁ ]之積層構成之積層體。繼而，自上述積層體L2(剝離襯墊/第2黏著劑層/剝離襯墊)剝離一個剝離襯墊後，經由藉由該剝離而露出之第2黏著劑層表面，將單側附帶剝離襯墊之第2黏著劑層貼合於上述膜F₁ 之另一面。如此，製作具有[剝離襯墊/第1黏著劑層(厚度100 μm)/作為基材之膜F₁ (厚度80 μm)/第2黏著劑層(厚度500 μm)/剝離襯墊]之積層構成之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例1之光學用雙面黏著帶之厚度為680 μm。 [實施例2] 使用對厚度80 μm之聚對苯二甲酸乙二酯膜(將「COSMOSHINE SRF」之易接著處理層替換為硬塗層用途之易接著處理層而成之膜，面內相位差8400，東洋紡股份有限公司製造)之兩面實施電暈處理所得之膜(膜F₂ )代替膜F₁ 作為光學用雙面黏著帶之基材，除此以外，以與實施例1相同之方式製作實施例2之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例2之光學用雙面黏著帶之厚度為680 μm。 [實施例3] 將第2黏著劑層之厚度設為100 μm而代替500 μm，除此以外，以與實施例1相同之方式製作實施例3之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例3之光學用雙面黏著帶的厚度為280 μm。 [實施例4] 將上述丙烯酸系黏著劑組合物C2塗佈於膜F₁ 之單面後，於130℃下加熱60秒鐘而進行乾燥及硬化，於膜F₁ 上形成厚度12 μm之黏著劑層(第1黏著劑層)。繼而，將PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)貼合於該黏著劑層之表面。藉此，獲得具有[剝離襯墊/黏著劑層(第1黏著劑層)/剝離襯墊]之積層構成之積層體(積層體L3)。另一方面，將上述丙烯酸系黏著劑組合物C2塗佈於PET系剝離襯墊(厚度125 μm，日東電工股份有限公司製造)之單面後，於130℃下加熱60秒鐘而進行乾燥及硬化，於該剝離襯墊上形成厚度12 μm之黏著劑層(第2黏著劑層)。然後，將上述積層體L3經由其膜F₁ 側表面而貼合於該黏著劑層之表面。如此，製作具有[剝離襯墊/第1黏著劑層(厚度12 μm)/作為基材之膜F₁ (厚度80 μm)/第2黏著劑層(厚度12 μm)/剝離襯墊]之積層構成的實施例4之光學用雙面黏著帶。除剝離襯墊之厚度外的實施例4之光學用雙面黏著帶的厚度為104 μm。 [比較例1] 使用對厚度75 μm之聚對苯二甲酸乙二酯膜(商品名「XD500P」，面內相位差3000，東麗股份有限公司製造)之兩面實施電暈處理所獲得之膜(膜F₃ )代替膜F₁ 作為光學用雙面黏著帶之基材，且將第2黏著劑層之厚度設為100 μm而代替500 μm，除此以外，以與實施例1相同之方式製作比較例1之光學用雙面黏著帶。除剝離襯墊之厚度外的比較例1之光學用雙面黏著帶之厚度為275 μm。 [比較例2] 使用膜F₃ 代替膜F₁ 作為光學用雙面黏著帶之基材，除此以外，以與實施例4相同之方式製作比較例2之光學用雙面黏著帶。除剝離襯墊之厚度外的比較例2之光學用雙面黏著帶之厚度為104 μm。 ＜艾勉道夫撕裂強度＞ 針對自實施例及比較例之光學用雙面黏著帶切出之各樣品片(60 mm×75 mm)，使用艾勉道夫撕裂強度測定裝置(商品名「艾勉道夫撕裂度試驗機」，TESTER SANGYO股份有限公司製造)，分別測定帶基材之寬度方向(TD)之艾勉道夫撕裂強度(N)與帶基材之機械方向(MD)之艾勉道夫撕裂強度(N)。本測定係依據JIS K 7128-2而進行。於供於測定之樣品片中預先設有自其端部於測定方向(TD或MD)上延伸之長度20 mm之切口。於本測定中，測定對於以該切口進一步伸長之方式藉由裝置對樣品片賦予之撕裂負荷的抵抗力。又，本測定所使用之上述裝置之測量最大值為1 N。將本測定之結果示於表1中。 ＜手撕性＞ 針對實施例及比較例之各光學用雙面黏著帶，研究其基材寬度方向之手撕性。具體而言，針對兩剝離襯墊經剝離之光學用雙面黏著帶，嘗試其基材寬度方向上之利用手工作業之撕裂。於該手工作業檢查中，將可容易地撕裂之情形評價為手撕性良好(○)，將無法撕裂之情形評價為手撕性不良(×)。將其結果示於表1中。 ＜霧度＞ 針對實施例及比較例之各光學用雙面黏著帶，使用霧度計HM-150型(村上色彩技術研究所股份有限公司製造)依據JIS K 7136所規定之方法測定霧度(%)。本測定係對處於兩剝離襯墊經剝離且貼附於載玻片(商品名「載玻片S1112」，厚度1.0～1.2 mm，松波硝子工業股份有限公司製造)之狀態下的光學用黏著帶進行。將其結果示於表1中。 [評價] 具備本發明之構成之實施例1～4之光學用雙面黏著帶均實現了良好之手撕性。相對於此，比較例1、2之光學用雙面黏著帶均無法以手於基材寬度方向上撕裂，未實現良好之手撕性。 [表1]

Fig. 1 is a partial cross-sectional view of an adhesive tape X as an optical double-sided adhesive tape according to an embodiment of the present invention. The adhesive tape X has a laminated structure including a base 10 as a transparent substrate, an adhesive layer 11 as a first adhesive layer, and an adhesive layer 12 as a second adhesive layer. The adhesive tape X can be used, for example, in the manufacture of display devices such as flat panel displays. When a display device such as a liquid crystal display or an input device such as a touch panel has a multilayer structure including various substrates or films, it is used to join adjacent specific parts in the multilayer structure, or to fill the gap between adjacent parts. For gaps, adhesive tape X can be used. The base material 10 of the adhesive tape X is a part of the adhesive tape X that is located between the adhesive layers 11 and 12 and functions as a support, and is a light-transmitting uniaxially stretched polyester system in the width direction of the base material Substrate. The term "polyester-based base material" refers to a base material such as a film or sheet containing a polyester-based resin at the largest weight ratio in the constituent material. Examples of the constituent material of such a substrate 10 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polyethylene terephthalate-1,4. -Cyclohexane dimethyl ester. The so-called uniaxially stretched polyester-based substrate in the width direction of the substrate refers to the direction of travel of, for example, a film-like extruded body after extrusion molding of the raw resin material in the manufacturing process of the polyester-based substrate A polyester-based substrate processed uniaxially in the width direction (TD) perpendicular to the machine direction (MD). Regarding the stretch magnification in the width direction of the substrate 10 which is such a uniaxially stretched polyester-based substrate in the width direction, it is preferably 2.5 times or more, more preferably 3 times or more. In addition, the stretching ratio is preferably 6 times or less, and more preferably 5.5 times or less. The thickness of the substrate 10 is 75 μm or more, preferably 80 μm or more. In addition, the thickness of the substrate 10 is preferably 150 μm or less, and more preferably 125 μm or less. The in-plane phase difference of the substrate 10 is preferably 1500 nm or more, more preferably 3000 nm or more, and even more preferably 6000 nm or more. In this embodiment, the so-called in-plane retardation of the substrate 10 refers to the surface parallel to the main surface of the substrate 10, which is related to the birefringence when light with a wavelength of 590 nm is transmitted through the substrate 10 at 23°C. It is generated between the polarized light component (abnormal light) that vibrates in the direction of the late axis and the polarized light component (normal light) that vibrates in the direction of the advance axis in the two optical spindles (the slow axis and the advancing axis) that go straight inside The phase difference. The in-plane phase difference is based on setting the refractive index of the abnormal light (relatively large) to nx, the refractive index of the normal light (relatively small) to ny, and the thickness of the substrate 10 to d (nm). In this case, set to the value represented by (nx-ny)×d. The surface of the substrate 10 on the side of the adhesive layer 11 and the surface on the side of the adhesive layer 12 may also be subjected to surface treatment to improve the adhesion with the adhesive layer. Examples of such surface treatments include physical treatments such as corona treatment and plasma treatment, and chemical treatments such as primer treatment. The adhesive layers 11 and 12 of the adhesive tape X each contain an adhesive as a main agent, and have light permeability. The main ingredient is the component that contains the largest weight ratio among the components. The adhesive layer 11 and/or the adhesive layer 12 includes, for example, an acrylic polymer as an acrylic adhesive, a polyurethane as a urethane adhesive, a silicone adhesive, And at least one of the group consisting of rubber-based adhesives. From the viewpoint of achieving both the degree of adhesion and high transparency required by the adhesive layer of the optical double-sided adhesive tape, as the adhesive in the adhesive layers 11 and 12, it is preferable to use acrylic polymer. In addition, the adhesive layer 11 has an adhesive surface 11a that can be attached to the adherend, and the adhesive layer 12 has an adhesive surface 12a that can be attached to the adherend. When the adhesive layer 11 and/or the adhesive layer 12 contains 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 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 used to form the above-mentioned acrylic polymer, that is, contained in the monomer component used to form the above-mentioned acrylic polymer Alkyl (meth)acrylates having linear or branched alkyl groups include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, (meth) Base) isopropyl acrylate, n-butyl (meth)acrylate, second butyl (meth)acrylate, isobutyl (meth)acrylate, tertiary butyl (meth)acrylate, (meth)acrylic acid Amyl ester, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (meth)acrylate Base) 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, (meth) Cetyl acrylate, heptadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, nonadecyl (meth)acrylate, And (meth)acrylic acid alkyl esters, such as eicosyl (meth)acrylate, which has a linear or branched chain alkyl group having 1 to 20 carbon atoms. As the alkyl (meth)acrylate used in the acrylic polymer, one type of alkyl (meth)acrylate may be used, or two or more types of alkyl (meth)acrylate may be used. In this embodiment, as the alkyl (meth)acrylate used in the acrylic polymer, it is preferable to use one selected from the group consisting of n-butyl acrylate, 2-ethylhexyl acrylate, and isostearyl acrylate. At least one of the group consisting of. The ratio of monomer units derived from alkyl (meth)acrylates having linear or branched alkyl groups 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 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. The composition related to the ratio of the alkyl (meth)acrylate having a linear or branched alkyl group is preferable in terms of making the adhesive layer formed of the acrylic polymer suitably It exhibits basic properties such as the adhesiveness of acrylic polymers as acrylic adhesives. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may also include monomer units derived from alicyclic monomers. As the alicyclic monomer used to form the monomer unit of the acrylic polymer, that is, the alicyclic monomer contained in the monomer component used to form the acrylic polymer, for example: (meth)acrylic acid Cycloalkyl esters, (meth)acrylates having a bicyclic hydrocarbon ring, and (meth)acrylates having a hydrocarbon ring with three or more rings. Examples of cycloalkyl (meth)acrylates include cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, and cyclooctyl (meth)acrylate ester. Examples of (meth)acrylates having a bicyclic hydrocarbon ring include (meth)acrylate and iso(meth)acrylate. Examples of (meth)acrylates having three or more hydrocarbon rings include: dicyclopentyl (meth)acrylate, dicyclopentyloxyethyl (meth)acrylate, tricyclic (meth)acrylate Pentyl 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 this embodiment, as the alicyclic monomer used in the acrylic polymer, it is preferable to use a group selected from cyclohexyl acrylate, cyclohexyl methacrylate, isopropyl acrylate, and isopropyl methacrylate. At least one of the group consisting of esters. Regarding the ratio of monomer units derived from alicyclic monomers in the acrylic polymer, from the viewpoint of achieving moderate flexibility in the adhesive layer formed of the acrylic polymer, it is preferably 5 ~60% by weight, more preferably 10-50% by weight. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may also include monomer units derived from hydroxyl-containing monomers. The hydroxyl-containing monomer system has at least one hydroxyl group in the monomer unit. When the acrylic polymer in the adhesive layers 11 and 12 contains hydroxyl-containing monomer units, the adhesive layers 11 and 12 can easily obtain adhesiveness or moderate cohesion. Examples of the hydroxyl-containing monomer used to form the monomer unit of the acrylic polymer, that is, the hydroxyl-containing monomer contained in the monomer component used to form the acrylic polymer, include, for example, hydroxyl-containing ( Meth) acrylate, vinyl alcohol, and allyl alcohol. Examples of hydroxyl-containing (meth)acrylates include: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, (meth) Base) 4-hydroxybutyl acrylate, 6-hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, hydroxydecyl (meth)acrylate, hydroxylauryl (meth)acrylate, and (meth) (4-hydroxymethylcyclohexyl)methyl acrylate. As the hydroxyl-containing monomer used in the acrylic polymer, one kind of hydroxyl-containing monomer may be used, or 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 preferable to use 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and methyl methacrylate. At least one of the group consisting of 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, and 4-hydroxybutyl methacrylate. The ratio of the monomer unit derived from the 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, more preferably 5% by weight Above, it is more preferably 7% by weight or more, and still more preferably 10% by weight or more. The ratio of the monomer unit derived from the hydroxyl-containing monomer in the acrylic polymer is preferably 20% by weight or less, more preferably 18% by weight or less. The constitutions related to the ratio of the hydroxyl group-containing monomer are preferable in terms of achieving adhesiveness or moderate cohesiveness of the adhesive layer formed by the acrylic polymer. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may also include monomer units derived from monomers containing nitrogen atoms. A monomer containing a nitrogen atom is a monomer having at least one nitrogen atom in the monomer unit. When the acrylic polymer in the adhesive layers 11 and 12 contains a monomer unit containing nitrogen atoms, the adhesive layers 11 and 12 can easily obtain hardness or good bonding reliability. As the nitrogen atom-containing monomer used to form the monomer unit of the acrylic polymer, that is, the nitrogen atom-containing monomer contained in the monomer component used to form the acrylic polymer, for example, N-ethylene Cyclic amides and (meth)acrylamides. Regarding the N-vinyl cyclic amide, which is a monomer containing a nitrogen atom, for example, N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, and N-vinyl-3 -Ketone, N-vinyl-2-caprolactone, N-vinyl-1,3-㗁𠯤-2-one, and N-vinyl-3,5-𠰌linedione. Regarding (meth)acrylamides as monomers containing nitrogen atoms, for example, (meth)acrylamide, N-ethyl(meth)acrylamide, 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 kind of nitrogen atom-containing monomer may be used, or two or more kinds of nitrogen atom-containing monomers may be used. In this embodiment, it is preferable to use N-vinyl-2-pyrrolidone as the nitrogen atom-containing monomer used for the acrylic polymer. Regarding the ratio of the monomer units derived from the nitrogen atom-containing monomer in the acrylic polymer, the adhesive layer formed by the acrylic polymer can achieve moderate hardness, adhesiveness, and transparency. In general, 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 the nitrogen atom-containing monomer in the acrylic polymer, it is possible to achieve sufficient transparency in the adhesive layer formed by the acrylic polymer, or to suppress the change. From the viewpoint of being too hard and achieving good bonding reliability, it 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 also include a monomer unit derived from a monomer containing a carboxyl group. The carboxyl group-containing monomer system has at least one carboxyl group in the monomer unit. When the acrylic polymer in the adhesive layers 11 and 12 contains carboxyl group-containing monomer units, there are cases where the adhesive layers 11 and 12 can easily obtain good bonding reliability. As the carboxyl group-containing monomer used to form the monomer unit of the acrylic polymer, that is, the carboxyl group-containing monomer contained in the monomer component used to form the acrylic polymer, for example: (methyl) Acrylic acid, methylene succinic acid, maleic acid, fumaric acid, crotonic acid, and methacrylic acid. As the carboxyl group-containing monomer used in the acrylic polymer, one carboxyl group-containing monomer may be used, or two or more carboxyl group-containing monomers may be used. In this embodiment, as the carboxyl group-containing monomer used for the acrylic polymer, acrylic acid is preferably used. Regarding the ratio of the monomer units derived from the carboxyl group-containing monomer in the acrylic polymer, the adhesive layer formed by the acrylic polymer can be compared to the case where there are polar groups on the surface of the adherend. From the viewpoint of ensuring good bonding reliability with the help of the interaction of the polar groups, it is preferably 0.1% by weight or more, and more preferably 0.5% by weight or more. In addition, regarding the ratio of the monomer unit derived from the carboxyl group-containing monomer in the acrylic polymer, the viewpoint that the adhesive layer formed by the acrylic polymer is prevented from becoming too hard to achieve good bonding reliability In particular, it is preferably 20% by weight or less, and more preferably 15% by weight or less. The acrylic polymer contained in the adhesive layer 11 or the adhesive layer 12 may also have a crosslinked structure derived from a multifunctional (meth)acrylate as a copolymerizable crosslinking agent. Examples of polyfunctional (meth)acrylates include 1,6-hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (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 in the acrylic polymer, one type of polyfunctional (meth)acrylate may be used, or two or more types of polyfunctional (meth)acrylate may be used. In the present embodiment, as the polyfunctional (meth)acrylate used in the acrylic polymer, it is preferable to use one 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 polyfunctional (meth)acrylate-derived monomer unit in the acrylic polymer is preferably 0.01% by weight or more, more preferably 0.03% by weight or more, and even more preferably 0.05% by weight or more. The ratio of the polyfunctional (meth)acrylate-derived monomer unit in the acrylic polymer is preferably 1% by weight or less, more preferably 0.5% by weight or less. The constitutions related to the ratio of the multifunctional (meth)acrylate are preferable in terms of achieving appropriate hardness or adhesiveness of the adhesive layer formed of the acrylic polymer. When the adhesive layer 11 and/or the adhesive layer 12 contains the above-mentioned acrylic polymer as an adhesive, the content of the acrylic polymer in the adhesive layer is, for example, 85-100% by weight. From the viewpoint of achieving higher adhesiveness at room temperature, the adhesive layers 11 and 12 may contain, for example, acrylic oligomers whose raw material monomer composition is different from the above-mentioned acrylic polymer. When the adhesive layer 11 and/or the adhesive layer 12 contains such an acrylic oligomer, relative to 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer, the acrylic acid in the adhesive layer is low The content of the polymer is, for example, 0.1 to 20 parts by weight. The above-mentioned oligomer preferably contains a monomer unit derived from a (meth)acrylate having a cyclic structure (a (meth)acrylate containing a ring), and a monomer unit derived from a linear or branched alkyl group. (Meth) acrylic acid alkyl ester monomer unit polymer. As the ring-containing (meth)acrylate used to form the monomer unit of the above-mentioned oligomer, that is, the ring-containing (meth)acrylate contained in the monomer component used to form the oligomer, for example, Examples: (meth) acrylate cycloalkyl esters, (meth) acrylates having a bicyclic hydrocarbon ring, (meth) acrylates having three or more hydrocarbon rings, and (meth) acrylates having an aromatic ring )Acrylate. Examples of cycloalkyl (meth)acrylates include cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, and cyclooctyl (meth)acrylate ester. Examples of (meth)acrylates having a bicyclic hydrocarbon ring include (meth)acrylate and iso(meth)acrylate. Examples of (meth)acrylates having three or more hydrocarbon rings include: dicyclopentyl (meth)acrylate, dicyclopentyloxyethyl (meth)acrylate, tricyclic (meth)acrylate Pentyl 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, as the ring-containing (meth)acrylate used for the oligomer, it is preferable to use at least one selected from the group consisting of dicyclopentyl acrylate and dicyclopentyl methacrylate . Regarding the ratio of the monomer unit derived from the ring-containing (meth)acrylate in the above-mentioned oligomer, it is preferable from the viewpoint of achieving moderate flexibility in the adhesive layer formed by 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 the monomer unit used to form the above-mentioned oligomer, that is, the monomer component used to form the oligomer has a linear Alkyl (meth)acrylates of chain or branched chain alkyl include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, (meth) Isopropyl acrylate, n-butyl (meth)acrylate, second butyl (meth)acrylate, isobutyl (meth)acrylate, tertiary 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, ten (meth)acrylate Hexaalkyl ester, heptadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, nonadecyl (meth)acrylate, and ( Alkyl (meth)acrylates such as eicosyl methacrylate having a linear or branched alkyl group having 1 to 20 carbon atoms. As the alkyl (meth)acrylate used in the above-mentioned oligomer, one type of alkyl (meth)acrylate may be used, or two or more types of alkyl (meth)acrylate may be used. In this embodiment, as the alkyl (meth)acrylate used in the above-mentioned oligomer, methyl methacrylate is preferably used. Regarding the ratio of monomer units derived from alkyl (meth)acrylates having linear or branched alkyl groups in the above-mentioned oligomers, the adhesive layer formed by including the oligomers can achieve a moderate From the viewpoint of the modulus of elasticity, 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 above-mentioned oligomers may also include monomers derived from carboxyl groups, or amine group-containing monomers, amine group-containing monomers, cyano group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid-containing monomers Monomer units of monomers containing groups, monomers containing isocyanate groups, and monomers containing imine groups. The weight average molecular weight (Mw) of the above-mentioned oligomer is, for example, 1,000 to 30,000, preferably 1,000 to 20,000, and more preferably 1,500 to 10,000. From the viewpoint of ensuring good adhesion of the adhesive layer formed by including the above-mentioned oligomer, the weight average molecular weight of the oligomer is preferably 1000 or more. On the other hand, from the viewpoint of ensuring that the adhesive layer formed of the above-mentioned oligomer ensures the adhesive force especially at room temperature, the weight average molecular weight of the oligomer is preferably 30,000 or less. The weight average molecular weight of the above-mentioned oligomer can be measured by the gel permeation chromatography (GPC) method. For example, a GPC measuring device (trade name "HLC-8120GPC", manufactured by Tosoh Co., Ltd.) can be used to obtain the weight average molecular weight (Mw) as 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 (made by Tosoh Co., Ltd.), and TSKgel Super AW2500 (downstream side, manufactured by Tosoh Co., Ltd.) connected in series ・String size: each string is 6.0 mm

×150 mm ・Column temperature (measurement temperature): 40℃ ・Lluent: Tetrahydrofuran (THF) ・Flow rate: 0.4 mL/min ・Sample injection volume: 20 μL ・Sample concentration: about 2.0 g/L (tetrahydrofuran solution) ・Standard sample: Polystyrene · Detector: Differential Refractometer (RI) Adhesive layers 11 and 12 may also contain a silane coupling agent, respectively. Examples of the silane coupling agent include: γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N- Phenyl-aminopropyl trimethoxysilane. As the silane coupling agent, commercially available products such as trade name "KBM-403" (manufactured by Shin-Etsu Chemical Co., Ltd.) can also be cited. As the silane coupling agent, γ-glycidoxypropyltrimethoxysilane is preferred. When the adhesive layer 11 and/or the adhesive layer 12 contains a silane coupling agent, relative to 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer, the content of the silane coupling agent in the adhesive layer is better It is 0.01 part by weight or more, more preferably 0.02 part by weight or more. In addition, the content of the silane coupling agent in the adhesive layer is preferably 1 part by weight or less, more preferably 0.5 parts by weight or less with respect to 100 parts by weight of the acrylic polymer. The composition related to the content of the silane coupling agent is to enable the adhesive layer formed by the silane coupling agent to achieve higher adhesion under humidified conditions, especially for the higher adhesion of glass Better. The adhesive layers 11 and 12 may contain ultraviolet absorbers, respectively. Ultraviolet absorbers are chemical species that can efficiently absorb ultraviolet rays and can convert the absorbed energy into heat or infrared rays and release them. Examples of such ultraviolet absorbers include: benzotriazole-based ultraviolet absorbers, hydroxyphenyltriazole-based ultraviolet absorbers, salicylate-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and oxygen Benzophenone-based ultraviolet absorbers and cyanoacrylate-based ultraviolet absorbers. The adhesive layer 11 and/or the adhesive layer 12 may contain one kind of ultraviolet absorber, or may contain two or more kinds of ultraviolet absorbers. Examples of benzotriazole-based ultraviolet absorbers include 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole (trade name "TINUVIN PS", manufactured by BASF Corporation), Phenylpropionic acid 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy alkyl ester of carbon number 7-9 (trade name "TINUVIN 384-2", manufactured by BASF Corporation), 3-[3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl] octyl propionate and 3 -[3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl]propionic acid 2-ethylhexyl mixture (trade name "TINUVIN 109" , Made by BASF Corporation), 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (trade name "TINUVIN 900", BASF Corporation) Manufacturing), 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 The reaction product of polyethylene glycol 300 (trade name "TINUVIN 1130", manufactured by BASF), 2-(2H-benzotriazol-2-yl)-p-cresol (trade name "TINUVIN P", manufactured by BASF) ), 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-(tert-butyl)phenol (trade name "TINUVIN 326", manufactured by BASF Corporation), 2-(2H-benzene N-triazol-2-yl)-4,6-di-tertiary amylphenol (trade name "TINUVIN 328", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-4- (1,1,3,3-Tetramethylbutyl)phenol (trade name "TINUVIN 329", manufactured by BASF Corporation), 2,2'-methylenebis[6-(2H-benzotriazole-2) -Yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (trade name "TINUVIN 360", manufactured by BASF Corporation), 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 Amino-methyl)-5-methylphenyl]benzotriazole (trade name "Sumisorb 250", manufactured by Sumitomo Chemical Co., Ltd.), and 2,2'-methylenebis[6-(2 H-benzotriazol-2-yl)-4-tertiary octylphenol] (trade name "Adekastab LA-31", manufactured by ADEKA Co., Ltd.). Examples of hydroxyphenyl tris-based ultraviolet absorbers include: 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-tris-2-yl)-5 -The reaction product of hydroxyphenyl and [(C10-16 alkoxy) methyl] oxetane (trade name "TINUVIN 400", manufactured by BASF Corporation), 2-[4,6-bis(2 ,4-Dimethylphenyl)-1,3,5-tris-2-yl]-5-[3-(dodecyloxy)-2-hydroxypropoxy]phenol), 2-( 2,4-Dihydroxyphenyl)-4,6-bis-(2,4-dimethylphenyl)-1,3,5-tris(2-ethylhexyl)-glycidyl ester Reaction product (trade name "TINUVIN 405", manufactured by BASF Corporation), 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-tris-2-yl)-5-[(hexyl )Oxy]-phenol (trade name "TINUVIN 1577", manufactured by BASF Corporation), 2-(4,6-diphenyl-1,3,5-tris-2-yl)-5-[2-( 2-Ethylhexyloxy)ethoxy]-phenol (trade name "Adekastab LA-46", manufactured by ADEKA Co., Ltd.), and 2-(2-hydroxy-4-[1-octyloxycarbonylethyl Oxy]phenyl)-4,6-bis(4-phenylphenyl)-1,3,5-tris (trade name "TINUVIN 479", manufactured by BASF Corporation). Examples of salicylate-based ultraviolet absorbers include phenyl 2-propenoxybenzoate, phenyl 2-propenoxy-3-methylbenzoate, and 2-propenoxy-4- Phenyl methyl benzoate, 2-propenyloxy-5-methyl phenyl benzoate, 2-propenyloxy-3-methoxy phenyl benzoate, 2-hydroxy phenyl benzoate, 2- Phenyl hydroxy-3-methyl benzoate, phenyl 2-hydroxy-4-methyl benzoate, phenyl 2-hydroxy-5-methyl benzoate, phenyl 2-hydroxy-3-methoxybenzoate , And 2,4-Di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate (trade name "TINUVIN 120", manufactured by BASF Corporation). Examples of benzophenone-based ultraviolet absorbers or oxybenzophenone-based ultraviolet absorbers 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 cyanoacrylate-based ultraviolet absorbers include 2-cyanoacrylate alkyl ester, 2-cyanoacrylate cycloalkyl ester, 2-cyanoacrylate alkoxyalkyl ester, and 2-cyanoacrylate Alkenyl ester, 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 high ultraviolet absorption and high light stability, or the viewpoint of easily obtaining an adhesive layer with high transparency In other words, it is preferably at least one selected from the group consisting of benzotriazole-based ultraviolet absorbers, hydroxyphenyltriazole-based ultraviolet absorbers, and benzophenone-based ultraviolet absorbers. The ultraviolet absorber contained in the adhesive layer 11 and/or the adhesive layer 12 is more preferably a phenyl group having a hydrocarbon group with 6 or more carbons and a hydroxyl group as a substituent bonded to a benzotriazole ring constituting a nitrogen atom. Triazole is an ultraviolet absorber. When the adhesive layer 11 and/or the adhesive layer 12 contains ultraviolet absorbers, the content of the ultraviolet absorber in the adhesive layer is controlled by controlling the light transmittance of the adhesive layer with a wavelength of 350 nm to achieve higher From the viewpoint of UV absorption, relative to 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer, 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 . In addition, regarding the content of the ultraviolet absorber in the adhesive layer, the adhesive layer suppresses the yellowing phenomenon of the adhesive accompanying the addition of the ultraviolet absorber and realizes excellent optical properties or high transparency. From a viewpoint, relative to 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer, it is preferably 10 parts by weight or less, more preferably 9 parts by weight or less, and even more preferably 8 parts by weight or less. The adhesive layers 11 and 12 may contain light stabilizers, respectively. When the adhesive layers 11 and 12 each contain a light stabilizer, it is preferable to contain an ultraviolet absorber together. The light stabilizer is a chemical species that can capture free radicals that may be generated by the irradiation of light such as ultraviolet rays. Examples of the light stabilizer include amine light stabilizers such as phenol-based light stabilizers, phosphor-based light stabilizers, thioether-based light stabilizers, and hindered amine-based stabilizers. The adhesive layer 11 and/or the adhesive layer 12 may contain one kind of light stabilizer, or may contain two or more kinds of light stabilizers. Examples of phenolic light stabilizers include 2,6-di-tert-butyl-4-methylphenol, 4-hydroxymethyl-2,6-di-tert-butylphenol, and 2,6- Di-tert-butyl-4-ethylphenol, butylated hydroxyanisole, 3-(4-hydroxy-3,5-di-tert-butylphenyl) n-octadecyl propionate, (4-Hydroxy-3-methyl-5-tert-butyl) distearyl benzylmalonate, tocopherol, 2,2'-methylenebis(4-methyl-6-tert-butyl) Phenol), 2,2'-methylene bis (4-ethyl-6-tertiary butyl phenol), 4,4'-methylene bis (2,6-di-tertiary butyl phenol) , 4,4'-butylene bis(6-tertiary butyl-m-cresol), 4,4'-thiobis(6-tertiary butyl-m-cresol), styrenated phenol, N, N'-hexamethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide), bis(3,5-di-tert-butyl-4-hydroxybenzylphosphonate) Esters) calcium, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris (3,5-Di-tert-butyl-4-hydroxybenzyl)benzene, tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane , 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-methylenebis(4-methyl -6-Cyclohexylphenol), 2,2'-methylenebis[6-(1-methylcyclohexyl)-p-cresol], 1,3,5-tris(4-tertiary butyl-3 -Hydroxy-2,6-dimethylbenzyl) isocyanuric acid, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid, Triethylene glycol-bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], 2,2'-oxamide bis[ethyl 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate), 6-(4-hydroxy-3,5-di-tert-butylanilino)-2,4-dioctylthio -1,3,5-tris, terephthalic acid bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)benzene Yl] ester, 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl} -2,4,8,10-tetraoxaspiro[5.5]undecane, and 3,9-bis{2-[3-(3,5-di-tert-butyl-4-hydroxyphenyl) Propyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane. Examples of phosphorous light stabilizers include tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, and tris(2-tert-butyl) phosphite 4-(3-tert-butyl-4-hydroxy-5-methylphenylsulfanyl)-5-methylphenyl) ester, tridecyl phosphite, octyl diphenyl phosphite, Di(decyl)monophenyl phosphate, di(tridecyl)pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, di(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, tetra(tridecyl)isopropylidene diphenol diphosphite, tetra(tridecyl)-4,4'-n-butylene Bis(2-tertiary butyl-5-methylphenol) diphosphite, hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-third Butyl phenyl) butane triphosphite, tetrakis (2,4-di-tert-butylphenyl) bisphenyl diphosphonite diester, 9,10-dihydro-9-oxa-10 -Phosphaphenanthrene-10-oxide, and tris(2-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphorus Hepten-6-yl)oxy]ethyl)amine. Examples of thioether-based light stabilizers include dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiodipropionate and other dialkyl thiodipropionates. Ester compounds, and β-alkyl mercaptopropionate compounds of polyhydric alcohols such as tetra[methylene(3-dodecylthio)propionate]methane. As an amine-based light stabilizer, for example, a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol (trade name "TINUVIN 622", BASF Corporation), the polymer is combined with N,N',N'',N'''-tetra-(4,6-bis-(butyl-(N-methyl-2,2,6,6- Tetramethylpiperidin-4-yl)amino)-tris-2-yl)-4,7-diazadecane-1,10-diamine one-to-one reaction product (trade name ``TINUVIN 119 ", made by BASF), poly[{6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-tris-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 Corporation), bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (trade name "TINUVIN 770", manufactured by BASF Corporation), sebacic acid The reaction product of bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl) ester and 1,1-dimethylethyl hydroperoxide and octane ( Trade name "TINUVIN 123", manufactured by BASF Corporation), [[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butylmalonate bis(1,2 ,2,6,6-Pentamethyl-4-piperidinyl) ester (trade name "TINUVIN 144", manufactured by BASF Corporation), cyclohexane and N-butyl peroxide 2,2,6,6-tetra The reaction product of methyl-4-piperidinamine-2,4,6-trichloro-1,3,5-tris and 2-aminoethanol (trade name "TINUVIN 152", manufactured by BASF) , Bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperate A mixture of pyridine esters (trade name "TINUVIN 292", manufactured by BASF), and 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidine Mixed esters of alcohol and 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane (trade name "Adekastab LA-63P", manufactured by ADEKA Co., Ltd.). As the amine stabilizer, a hindered amine stabilizer is particularly preferred. When the adhesive layer 11 and/or the adhesive layer 12 contains a light stabilizer, the content of the light stabilizer in the adhesive layer is relative to the viewpoint of achieving sufficient light resistance in the adhesive layer. 100 parts by weight of the adhesive or acrylic polymer in the agent layer is preferably 0.1 parts by weight or more, 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 higher transparency, it is relative to the adhesive or 100 parts by weight of the acrylic polymer is preferably 5 parts by weight or less, 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 also be cross-linked with a cross-linking agent other than the above-mentioned copolymerizable cross-linking agent. The adhesive or acrylic polymer cross-linking caused by the cross-linking agent can be used to adjust the gel fraction of the adhesive layer 11 and/or the adhesive layer 12. Examples of such crosslinking agents include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, melamine-based crosslinking agents, peroxide-based crosslinking agents, urea-based crosslinking agents, and metal alkoxide-based crosslinking agents. Linking agent, metal chelate-based cross-linking agent, metal salt-based cross-linking agent, carbodiimide-based cross-linking agent, azoline-based cross-linking agent, aziridine-based cross-linking agent, and amine-based cross-linking Agent. The adhesive layer 11 and/or the adhesive layer 12 may contain one kind of the crosslinking agent, or 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 lower aliphatic polyisocyanates include 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate. As alicyclic polyisocyanates, cyclopentyl diisocyanate, cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated xylene diisocyanate are mentioned, for example. Examples of aromatic polyisocyanates include 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, and xylylene diisocyanate. In addition, as the isocyanate-based crosslinking agent, trimethylolpropane/toluene diisocyanate adduct (trade name "Coronate L", manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane/hexaya 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 epoxy-based crosslinking agents (multifunctional epoxy compounds) include N,N,N',N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, 1,3- Bis(N,N-diglycidylaminomethyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol two 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 tris(2-hydroxyethyl) isocyanurate , Resorcinol diglycidyl ether, and bisphenol-S-diglycidyl ether. Moreover, as an epoxy-type crosslinking agent, the epoxy-type resin which has two or more epoxy groups can also be mentioned. In addition, as the epoxy-based crosslinking agent, commercially available products such as the brand name "Tetrad C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) can also be cited. When the adhesive layer 11 and/or the adhesive layer 12 contains the above-mentioned cross-linking agent for cross-linking between acrylic polymers, the content of the cross-linking agent in the adhesive layer will make the adhesive From the viewpoint of achieving sufficient bonding reliability of the adherend by the agent layer, relative to 100 parts by weight of the adhesive or acrylic polymer in the adhesive layer, preferably 0.001 parts by weight or more, more preferably 0.01 parts by weight above. In addition, regarding the content of the crosslinking agent in the adhesive layer, from the viewpoint that the adhesive layer exhibits moderate flexibility and achieves good adhesion, it is relative to the adhesive or acrylic polymer in the adhesive layer. 100 parts by weight, preferably 10 parts by weight or less, more preferably 5 parts by weight or less. The adhesive layers 11 and 12 may also contain crosslinking accelerators, tackifying resins, anti-aging agents, fillers, pigments or dyes, antioxidants, chain transfer agents, plasticizers, softeners, etc., respectively, as needed. Surfactant, and antistatic agent and other additives. Examples of the tackifying resin include rosin derivatives, polyterpene resins, petroleum resins, and oil-soluble phenols. Regarding the thickness of the adhesive layer 11, from the viewpoint of achieving sufficient adhesion of the adhesive tape X to the adherend on the adhesive layer 11 side, it is preferably 5 μm or more, more preferably 10 μm or more, and more preferably It is 15 μm or more. In addition, from the viewpoint of ease of formation, the thickness of the adhesive layer 11 is preferably 1000 μm or less, more preferably 900 μm or less, and even more preferably 800 μm or less. Regarding the thickness of the adhesive layer 12, from the viewpoint of achieving sufficient adhesion of the adhesive tape X to the adherend on the side of the adhesive layer 12, it is preferably 5 μm or more, more preferably 10 μm or more, and more preferably It is 15 μm or more. In addition, from the viewpoint of ease of formation, the thickness of the adhesive layer 11 is preferably 1000 μm or less, more preferably 900 μm or less, and even more preferably 800 μm or less. For the adhesive tape X having a laminated structure including the above-mentioned substrate 10 and adhesive layers 11, 12, the Emmendorf tear strength in the width direction of the substrate is 0.5 N or less, and the Emmendorf in the machine direction of the substrate Doffer tear strength is 1 N or more. Regarding the Emmendorf tear strength in the width direction of the substrate of the adhesive tape X, it is preferably 0.45 N or less, more preferably 0.4 N or less, and even more preferably 0.3 N or less. Regarding the Emmendorf tear strength in the machine direction of the base material of the adhesive tape X, it is preferably 1.1 N or more, more preferably 1.3 N or more, and even more preferably 1.5 N or more. The Emmendorf tear strength is a value measured in accordance with JIS K 7128-2. In addition, the haze in the thickness direction of the optical adhesive tape X is preferably 3% or less, more preferably 2.5% or less, more preferably 2% or less, more preferably 1.5% or less, and more preferably 1% or less. The haze is a value measured in accordance with JIS K 7136. Regarding the adhesive tape X, the total light transmittance in the visible light wavelength range is, for example, 85% or more. The total light transmittance is a value measured in accordance with JIS K 7361-1. The adhesive tape X can also be provided with a release liner (isolation film) in a manner of covering the adhesive surface 11a of the adhesive layer 11. The adhesive tape X can also be provided with a release liner (isolation film) in a manner of covering the adhesive surface 12a of the adhesive layer 12. The release liner is an element for protection so that the adhesive layers 11 and 12 of the adhesive tape X are not exposed, and it is peeled off from the adhesive tape X when the adhesive tape X is attached to the adherend. As the release liner, for example, a substrate having a release treatment layer, a low-adhesive substrate containing a fluoropolymer, and a low-adhesive substrate containing a non-polar polymer can be cited. The surface of the release liner can also be subjected to mold release treatment, antifouling treatment, or antistatic treatment. The thickness of the release liner is, for example, 5 to 200 μm. Specifically, the adhesive tape X can take the form of a sheet with a release liner covering the adhesive surfaces 11a, 12a of the adhesive layers 11, 12, or alternatively arrange the adhesive tape X and the release liner alternately The method has a release liner and is wound into a roll form. The adhesive tape X having the above-mentioned structure can be manufactured by forming the adhesive layers 11 and 12, respectively, 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 applying an adhesive composition for forming the adhesive layer 11 on a specific release liner to form an adhesive composition layer, and then laminating on the adhesive composition layer Release the liner to harden the adhesive composition between the release liners. On the other hand, the adhesive layer 12 can be formed, for example, by applying an adhesive composition for forming the adhesive layer 12 on a specific release liner to form an adhesive composition layer. A release liner is further laminated on the layer to harden the adhesive composition between the release liners. As the adhesive composition for forming the adhesive layer 11 and/or the adhesive composition for forming the adhesive layer 12, for example, an adhesive composition that can be cured by polymerization reaction by irradiation of active energy rays can be used. That is, the adhesive layer 11 and/or the adhesive layer 12 are, for example, a cured product 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 can be provided in the form of so-called partial polymers of a monomer mixture of a specific composition used to form an acrylic polymer. In addition, the adhesive composition may also contain other components as required as components of the formed adhesive layer. Examples of the active energy rays that are irradiated to the active energy ray curable adhesive composition to harden the adhesive layer include ultraviolet rays, α rays, β rays, γ rays, neutron beams, and electron beams, and it is preferable to use them Ultraviolet rays. For the active energy ray curable adhesive composition for forming an acrylic adhesive layer that is irradiated by active energy rays, an initial reaction is generated by the activation of the photopolymerization initiator, and the polymerization reaction proceeds to form an acrylic polymer Things. If active energy ray irradiation such as ultraviolet radiation is used as the curing method of the curable adhesive composition for forming the adhesive layer, even when the coating film of the adhesive composition is relatively thick, it is easy to obtain a properly cured The adhesive layer. Therefore, the composition of the adhesive layer 11 being a cured product of the active energy ray-curable adhesive composition is preferable in terms of realizing the adhesive layer 11 that is sufficiently hardened even if it is relatively thick. The adhesive layer 12 is a cured product of an active energy ray-curable adhesive composition, which is preferable in terms of realizing the adhesive layer 12 that is sufficiently hardened even if it is relatively thick. Examples of the photopolymerization initiator include: benzoin ether-based photopolymerization initiator, acetophenone-based photopolymerization initiator, α-ketol-based photopolymerization initiator, aromatic sulfonyl chloride-based photopolymerization Initiator, photoactive oxime-based photopolymerization initiator, benzoin-based photopolymerization initiator, benzyl-based photopolymerization initiator, benzophenone-based photopolymerization initiator, ketal-based photopolymerization initiator Agent, and 9-oxysulfur

Department of photopolymerization initiator. As the benzoin ether-based photopolymerization initiator, for example, 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. Base ketones (α-hydroxycyclohexyl phenyl ketone), 4-phenoxydichloroacetophenone, and 4-(tert-butyl)dichloroacetophenone. Examples of α-ketol-based photopolymerization initiators include 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropane-1 -ketone. As an aromatic sulfonyl chloride-based photopolymerization initiator, for example, 2-naphthalenesulfonyl chloride can be cited. Examples of the photoactive oxime-based photopolymerization initiator include 1-phenyl-1,2-propanedione-2-(O-ethoxycarbonyl)-oxime. As the benzoin-based photopolymerization initiator, for example, benzoin can be cited. As the benzyl-based photopolymerization initiator, for example, benzyl is mentioned. As the benzophenone-based photopolymerization initiator, for example, benzophenone, benzylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyvinyl Benzophenone. Examples of the ketal-based photopolymerization initiator include benzyl dimethyl ketal. As 9-oxysulfur

A photopolymerization initiator, for example, 9-oxysulfur

, 2-chloro-9-oxysulfur 𠮿

, 2-Methyl 9-oxysulfur

, 2,4-Dimethyl 9-oxysulfur

, Isopropyl 9-oxysulfur

, 2,4-Diisopropyl 9-oxysulfur

, And dodecyl 9-oxysulfur

. 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 forming the adhesive layer 11 and/or the adhesive composition for forming the adhesive layer 12, it is also possible to use an acrylic polymer that already contains an adhesive as an adhesive and it can be cured by, for example, heating and drying. The solvent adhesive composition or emulsion adhesive composition. The composition may also contain other components as required for the formed adhesive layer. The acrylic polymer in the adhesive composition can be obtained by polymerizing the raw monomer components for forming the acrylic polymer. Examples of the polymerization method include solution polymerization, emulsion polymerization, and bulk polymerization. When performing solution polymerization, for example, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, esters, and ketones can be used as a solvent. Examples of the aromatic hydrocarbon solvent include toluene and benzene. Examples of aliphatic hydrocarbon solvents include n-hexane and n-heptane. As a solvent of alicyclic hydrocarbons, cyclohexane and methylcyclohexane are mentioned, for example. Examples of ester solvents include ethyl acetate and n-butyl acetate. Examples of ketone solvents include methyl ethyl ketone and methyl isobutyl ketone. In solution polymerization, one solvent can be used, or two or more solvents can be used. When polymerizing raw material monomer components in order to obtain an acrylic polymer, a polymerization initiator can be used. Depending on the type of polymerization reaction, for example, a photopolymerization initiator or a thermal polymerization initiator can be used. During 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 ether-based photopolymerization initiator, acetophenone-based photopolymerization initiator, α-ketol-based photopolymerization initiator, and aromatic sulfonyl chloride-based photopolymerization. Initiator, photoactive oxime-based photopolymerization initiator, benzoin-based photopolymerization initiator, benzyl-based photopolymerization initiator, benzophenone-based photopolymerization initiator, ketal-based photopolymerization initiator Agent, and 9-oxysulfur

Department of photopolymerization initiator. The amount of the photopolymerization initiator used is, for example, 0.01 to 3 parts by weight with respect to the total amount of monomer components (100 parts by weight). Examples of thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators, and redox polymerization initiators. As an azo polymerization initiator, for example, 2,2'-azobisisobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, 2,2'-azobis( 2-methylpropionic acid) dimethyl ester, and 4,4'-azobis-4-cyanovaleric acid. As the peroxide-based polymerization initiator, for example, benzyl peroxide and tert-butyl maleate peroxide can be cited. The amount of the thermal polymerization initiator used is, for example, 0.05 to 0.3 parts by weight with respect to the total amount of monomer components (100 parts by weight). When used to obtain the above-mentioned acrylic polymer polymerization, in order to adjust the molecular weight of the acrylic polymer, a chain transfer agent can be used. As the chain transfer agent, for example, α-thioglycerol, 2-mercaptoethanol, 2,3-dimercapto-1-propanol, octyl mercaptan, tertiary nonyl mercaptan, dodecyl mercaptan (lauryl mercaptan) ), third-dodecyl mercaptan, glycidyl mercaptan, thioglycolic acid, methyl thioglycolate, ethyl thioglycolate, propyl thioglycolate, butyl thioglycolate, tert-butyl thioglycolate, thioglycolic acid 2- Ethylhexyl, octyl thioglycolate, isooctyl thioglycolate, decyl thioglycolate, and lauryl 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, it is preferable to use α-thioglycerin as the chain transfer agent. The amount of the chain transfer agent used is, for example, 0.01 to 0.5 parts by weight relative to the total amount (100 parts by weight) of the monomer components used to obtain the acrylic polymer. When the adhesive composition for forming an adhesive layer such as an active energy ray-curable adhesive composition, a solvent-based adhesive composition, an emulsion-type adhesive composition, or the like contains the above-mentioned acrylic oligomer, the oligomer The product can be obtained by polymerizing raw monomer components of a specific composition. Examples of the polymerization method include solution polymerization, emulsion polymerization, and bulk polymerization. As the solvent used for solution polymerization, those described above as solvents that can be used for solution polymerization for obtaining acrylic polymers can be cited. In this solution polymerization, one solvent can be used, or two or more solvents can be used. Moreover, when polymerizing raw material monomer components in order to obtain the said oligomer, a polymerization initiator can be used. As the polymerization initiator, the photopolymerization initiator or the thermal polymerization initiator described above as the polymerization initiator that can be used to obtain the polymerization of the acrylic polymer can be cited. During the polymerization, one polymerization initiator may be used, or two or more polymerization initiators may be used. For example, the substrate 10 of the adhesive tape X manufactured in the above-mentioned manner is a polyester-based substrate as described above. Such a configuration is preferable for allowing the double-sided adhesive tape base material and even the adhesive tape X to have various characteristics that the polyester base material easily exhibits, such as heat resistance, transparency, and dimensional stability. In addition, the substrate 10 included in the adhesive tape X is a polyester-based substrate that is uniaxially stretched in the width direction as described above. The thickness of the substrate 10 is 75 μm or more as described above, preferably 80 μm or more. As described above, the thickness of the substrate 10 is preferably 150 μm or less, more preferably 125 μm or less. When the tear strength such as the Emmendorf tear strength of the double-sided adhesive tape is strongly dominated by the mechanical properties of the substrate, these configurations are suitable for the adhesive tape X to achieve the Emmendorf tear strength in the width direction of the substrate The above structure is 0.5 N or less, and the Emmendorf tear strength in the machine direction of the substrate is 1 N or more. In addition, the Emmendorf tear strength in the width direction of the substrate of the adhesive tape X is 0.5 N or less as described above, preferably 0.45 N or less, more preferably 0.4 N or less, and even more preferably 0.3 N or less. In addition, the Emmendorf tear strength in the machine direction of the base material of the adhesive tape X is 1 N or more as described above, preferably 1.1 N or more, more preferably 1.3 N or more, and more preferably 1.5 N or more. These constitutions are suitable for the adhesive tape X to achieve good hand-tearability in the width direction of the substrate where the Emmendorf tear strength is relatively significantly lower than 0.5 N. In addition, the configuration in which the tear strength of Emmendorf is more than twice the width direction of the substrate in the machine direction of the substrate is preferable for the adhesive tape X to improve the directionality of tearing in the width direction of the substrate. Therefore, this configuration is better for the following situations: when the adhesive tape X is attached to the adherend, the peeling force is applied to the mechanical direction of the base material of the adhesive tape X without tearing In the case of the adhesive tape X, it is appropriately peeled from the adherend. Specifically, it is better for the following situations: when the adhesive tape X is attached to the adherend and then peeled off temporarily and then attached again (secondary processing operation), the peeling force is applied to the adhesive tape X In the machine direction of the substrate, the adhesive tape X is properly peeled from the adherend without tearing the adhesive tape X. In addition to the width direction of the substrate, the optical double-sided adhesive tape that is easily torn in the mechanical direction of the substrate has the following tendency: it is easy to break during the peeling in the secondary processing operation, and it is difficult to peel off properly. The optical double-sided adhesive tape that has broken can not be used for re-bonding. On the other hand, the adhesive tape X has the Emmendorf tear strength in the machine direction of the substrate which is sufficiently larger than the Emmendorf tear strength in the substrate width direction, which is suitable for achieving good hand-tearability in the substrate width direction. It is suitable to make the peeling force act on the mechanical direction of the substrate during the secondary processing operation, and peel off properly without tearing. As mentioned above, the adhesive tape X is suitable for achieving good hand-tearability and high secondary processability while having a polyester-based substrate on one side. The in-plane phase difference of the substrate 10 of the adhesive tape X is preferably 1500 nm or more, more preferably 3000 nm or more, and more preferably 6000 nm or more as described above. Such a configuration is preferable for the following situations: when an adhesive tape X is provided in a liquid crystal display device to fill the gap between the foremost transparent cover forming the display screen and the liquid crystal panel in the device, for example, suppression The so-called blanking phenomenon occurs when viewing the display screen through a lens with a polarization function such as polarized sunglasses. In addition, there is a tendency that the greater the in-plane retardation of the substrate 10 is, when the adhesive tape X is provided to fill the gap between the transparent cover and the liquid crystal panel in the liquid crystal display device, for example, when the adhesive tape X is provided through polarized sunglasses, etc. The so-called color unevenness phenomenon is suppressed when the lens with polarizing function sees the display screen. [Examples] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. [Production example of acrylic oligomer] In the reaction vessel, 60 parts by weight of dicyclopentyl methacrylate (DCPMA), 40 parts by weight of methyl methacrylate (MMA), and α- 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. under a nitrogen atmosphere for 1 hour. Next, 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator was added to the mixture in the reaction vessel to prepare a reaction solution, and the reaction was carried out at 70°C for 2 hours. Then, the reaction was carried out at 80°C for 2 hours. Thereafter, the reaction solution in the reaction vessel was placed under a temperature atmosphere of 130° C., and the toluene, chain transfer agent, and unreacted monomer were dried and removed from the reaction solution. Thereby, a solid acrylic oligomer is obtained. The weight average molecular weight (Mw) of the acrylic oligomer was 5.1×10 ³ . [Preparation example of acrylic adhesive composition C1] It contains 78 parts by weight of 2-ethylhexyl acrylate (2EHA), 18 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 2-hydroxy acrylate Ethyl (HEA) 4 parts by weight of the monomer mixture was added with 0.035 parts by weight of the first photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation) and the second photopolymerization initiator (trade name "Irgacure 184"). ", made by BASF Corporation) 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 rotor rotation speed of the device is set to 10 rpm, and the measurement temperature is set to 30°C. Thereby, a partial polymer obtained by partially polymerizing one of the monomer components in the mixture, that is, a prepolymer composition (containing monomer components that have 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 0.294 parts by weight of 1,6-hexanediol diacrylate (HDDA) Parts by weight and 0.353 parts by weight of a silane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed to obtain an acrylic adhesive composition (acrylic adhesive composition C1). [Preparation example of acrylic adhesive composition C2] In a flask (reaction vessel) equipped with a loop condenser, a nitrogen introduction tube, a stirrer, and a thermometer, 100 parts by weight of n-butyl acrylate (BA), acrylic acid ( AA) 5 parts by weight, 0.075 parts by weight of 2-hydroxyethyl acrylate (HEA), 0.2 parts by weight of benzyl peroxide (trade name "Nyper BW", manufactured by Nippon Oil & Fat Co., Ltd.) as a polymerization initiator, and A mixture of 205 parts by weight of ethyl acetate as a polymerization solvent was stirred smoothly under a nitrogen atmosphere, and the reaction was carried out at 63°C for 4 hours. Thereby, a solution (acrylic polymer solution) containing an acrylic polymer at a concentration of about 35% by weight was obtained. Then, after diluting the acrylic polymer solution with ethyl acetate so that the acrylic polymer concentration becomes 29% by weight, 0.6 parts by weight relative to 100 parts by weight of the acrylic polymer are added to the acrylic polymer solution. Trimethylolpropane/toluene diisocyanate adduct (trade name "Coronate L", manufactured by Nippon Polyurethane Industry Co., Ltd.) and 0.075 parts by weight of silane coupling agent (trade name "KBM-403", Shin-Etsu Chemical Co., Ltd. Made by the company), mixed at 25°C for about 1 minute to obtain a solvent-based acrylic adhesive composition (acrylic adhesive composition C2). [Example 1] <Formation of the first adhesive layer> The above-mentioned acrylic adhesive was applied to a polyethylene terephthalate (PET) release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.) The composition C1 forms an adhesive composition layer. Then, a PET-based release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.) was further laminated on the adhesive composition layer, and the adhesive composition layer was covered to block oxygen. In this way, a laminated body (laminated body L1') having a laminated structure of [release liner/adhesive composition layer/release liner] was obtained. Then, a black light lamp (manufactured by Toshiba Co., Ltd.) was used to irradiate the laminate L1' with ^{ultraviolet light with an illuminance of 3 mW/cm 2} from the side of one of the release liners for 300 seconds. By this, the adhesive composition layer of the laminate L1' is hardened to form an adhesive layer (first adhesive layer), and a [release liner/adhesive layer (first adhesive layer)/release liner] is obtained The layered body (layered body L1) constituted by the layered layer. The thickness of the first adhesive layer in the laminate L1 is 100 μm. <Formation of the second adhesive layer> The above-mentioned acrylic adhesive composition C1 was coated on a PET-based release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.) to form an adhesive composition layer. Then, a PET-based release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.) was further laminated on the adhesive composition layer, and the adhesive composition layer was covered to block oxygen. In this way, a laminated body (laminated body L2') having a laminated structure of [release liner/adhesive composition layer/release liner] was obtained. Then, a black light lamp (manufactured by Toshiba Co., Ltd.) was used to irradiate the laminate L2' with ultraviolet rays with an ^{illuminance of 3 mW/cm 2 from the side of one of the release liners for 300 seconds.} By this, the adhesive composition layer of the laminate L2' is hardened to form an adhesive layer (second adhesive layer), and a [release liner/adhesive layer (second adhesive layer)/release liner] is obtained The layered body (layered body L2) formed by the layered layer. The thickness of the second adhesive layer in the laminate L2 is 500 μm. <Production of optical double-sided adhesive tape> Prepare to corona both sides of a polyethylene terephthalate film (trade name "COSMOSHINE SRF", 8400 in-plane retardation, manufactured by Toyobo Co., Ltd.) with a thickness of 80 μm The film obtained by the treatment (film F ₁ ), after peeling off a release liner from the laminate L1 (release liner/first adhesive layer/release liner), pass through the first adhesive exposed by the peeling a surface layer, one side of the first adhesive layer included a release liner bonded to one surface of the film F as _1. Thereby, a laminated body having a laminated structure of [release liner/first adhesive layer/film F _{1] is obtained.} Next, after peeling off one release liner from the laminate L2 (release liner/second adhesive layer/release liner), the release liner is attached to one side through the surface of the second adhesive layer exposed by the peeling the second adhesive pads and the adhesive layer is bonded to the other surface of the film F _1. In this way, a laminate with [release liner/first adhesive layer (thickness 100 μm)/film F ₁ as a base material (thickness 80 μm)/second adhesive layer (thickness 500 μm)/release liner] was produced The double-sided adhesive tape for optics of the composition. The thickness of the optical double-sided adhesive tape of Example 1 except for the thickness of the release liner was 680 μm. [Example 2] A polyethylene terephthalate film with a thickness of 80 μm was used (the easy-adhesive layer of "COSMOSHINE SRF" was replaced with an easy-adhesive layer for hard coat use. The in-plane phase Difference 8400, produced by Toyobo Co., Ltd.) The film (film F ₂ ) obtained by corona treatment on both sides instead of film F ₁ as the base material of the optical double-sided adhesive tape, except for this, in the same manner as in Example 1 The optical double-sided adhesive tape of Example 2 was produced. The thickness of the optical double-sided adhesive tape of Example 2 except for the thickness of the release liner was 680 μm. [Example 3] Except that the thickness of the second adhesive layer was set to 100 μm instead of 500 μm, the double-sided optical adhesive tape of Example 3 was produced in the same manner as in Example 1. The thickness of the optical double-sided adhesive tape of Example 3 except for the thickness of the release liner was 280 μm. After [Example 4] The acrylic adhesive composition C2 was applied to one surface of _a film F is heated for 60 seconds at 130 ℃ and drying and curing, having a thickness of 12 μm on the film F is adhered to _a Agent layer (first adhesive layer). Then, a PET-based release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.) was attached to the surface of the adhesive layer. Thereby, a laminated body (laminated body L3) having a laminated structure of [release liner/adhesive layer (first adhesive layer)/release liner] was obtained. On the other hand, the acrylic adhesive composition C2 was applied to one side of a PET-based release liner (thickness 125 μm, manufactured by Nitto Denko Co., Ltd.), and then heated at 130°C for 60 seconds to dry and After curing, an adhesive layer (second adhesive layer) with a thickness of 12 μm is formed on the release liner. Then, the laminate L3 via _a side surface of the film F is bonded to the surface of the adhesive layer. In this way, a laminate with [release liner/first adhesive layer (thickness 12 μm)/film F ₁ as a base material (thickness 80 μm)/second adhesive layer (thickness 12 μm)/release liner] was produced The double-sided adhesive tape for optics of Example 4 constituted. The thickness of the optical double-sided adhesive tape of Example 4 except for the thickness of the release liner was 104 μm. [Comparative Example 1] A film obtained by corona treatment on both sides of a polyethylene terephthalate film (trade name "XD500P", in-plane retardation 3000, manufactured by Toray Co., Ltd.) with a thickness of 75 μm (Film F ₃ ) In place of film F ₁ as the base material of the double-sided adhesive tape for optics, and the thickness of the second adhesive layer was set to 100 μm instead of 500 μm, the same method as in Example 1 except that The optical double-sided adhesive tape of Comparative Example 1 was produced. The thickness of the optical double-sided adhesive tape of Comparative Example 1 except for the thickness of the release liner was 275 μm. [Comparative Example 2] A double-sided optical adhesive tape of Comparative Example 2 was produced in the same manner as in Example 4 except that the _{film F 3 was used} instead of the film F _{1 as the base material of the double-sided optical adhesive tape.} The thickness of the optical double-sided adhesive tape of Comparative Example 2 except for the thickness of the release liner was 104 μm. <Emmendorf Tear Strength> For each sample piece (60 mm×75 mm) cut out from the optical double-sided adhesive tapes of the Examples and Comparative Examples, the Emmendorf tear strength tester (trade name "Emmendorf") "Mundorf tearing tester", manufactured by TESTER SANGYO Co., Ltd., which measures the Eimiandorf tear strength (N) in the width direction (TD) of the substrate and the mechanical direction (MD) of the substrate. Miandorf tear strength (N). This measurement was performed in accordance with JIS K 7128-2. The sample sheet for measurement is provided with a 20 mm cut extending from its end in the measurement direction (TD or MD) in advance. In this measurement, the resistance to the tearing load applied to the sample piece by the device in such a way that the incision is further elongated is measured. In addition, the maximum value measured by the above-mentioned device used in this measurement is 1 N. Table 1 shows the results of this measurement. <Hand-tearability> For each optical double-sided adhesive tape of the Examples and Comparative Examples, the hand-tearability in the width direction of the substrate was studied. Specifically, for the optical double-sided adhesive tape from which the two release liners have been peeled off, try manual tearing in the width direction of the substrate. In this manual inspection, the case where it can be easily torn is evaluated as good tearability (○), and the case where it cannot be torn is evaluated as poor tearability (×). The results are shown in Table 1. <Haze> For each optical double-sided adhesive tape of the Examples and Comparative Examples, the haze meter HM-150 (manufactured by Murakami Color Research Institute Co., Ltd.) was used to measure the haze according to the method specified in JIS K 7136 ( %). This measurement is for the optical adhesive tape in a state where the 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 Matsuba Glass Industry Co., Ltd.) conduct. The results are shown in Table 1. [Evaluation] The optical double-sided adhesive tapes of Examples 1 to 4 having the constitution of the present invention all achieved good hand-tearability. In contrast, the optical double-sided adhesive tapes of Comparative Examples 1 and 2 could not be torn by hand in the width direction of the substrate, and good hand-tearability was not achieved. [Table 1]

10‧‧‧Base material 11‧‧‧Adhesive layer (1st adhesive layer) 11a‧‧‧ Adhesive surface 12‧‧‧ Adhesive layer (2nd adhesive layer) 12a‧‧‧ Adhesive surface X‧‧‧ Adhesive tape (double-sided adhesive tape for optics)

Fig. 1 is a partial cross-sectional view of a double-sided optical adhesive tape according to an embodiment of the present invention.

10‧‧‧Substrate

11‧‧‧Adhesive layer (1st adhesive layer)

11a‧‧‧Adhesive surface

12‧‧‧Adhesive layer (Second adhesive layer)

12a‧‧‧Adhesive surface

X‧‧‧Adhesive tape (Double-sided adhesive tape for optics)

Claims (7)

A double-sided adhesive tape for optics has a laminated structure including a first adhesive layer, a second adhesive layer, and a transparent substrate between the first and second adhesive layers, and the first adhesive layer And the second adhesive layer is directly provided on the surface of the transparent substrate, the first adhesive layer and the second adhesive layer include an acrylic adhesive, the acrylic adhesive includes an acrylic polymer, the The transparent substrate is a polyester-based substrate that extends uniaxially in the width direction of the substrate and has a thickness of 75μm or more. The Elmendorf tear strength in the width direction of the substrate of the optical double-sided adhesive tape is 0.5N or less, and The Emmendorf tear strength in the machine direction of the substrate is 1N or more. The optical double-sided adhesive tape of claim 1, wherein the thickness of the transparent substrate is 150 μm or less. Such as the optical double-sided adhesive tape of claim 1, wherein the stretch magnification in the width direction of the transparent substrate is 2.5-6 times. The optical double-sided adhesive tape of claim 1, wherein the thickness of the first adhesive layer is 5 μm or more, and the thickness of the second adhesive layer is 5 μm or more. Such as the double-sided optical adhesive tape of claim 1, wherein the above-mentioned first adhesive layer and/or the above-mentioned first 2 The adhesive layer is the cured product of the active energy ray-curable adhesive composition. For example, the optical double-sided adhesive tape of claim 1, its haze is 3% or less. The optical double-sided adhesive tape according to any one of claims 1 to 6, wherein the transparent substrate has an in-plane phase difference of 1500 nm or more.

Images