TWI707937B - Adhesive sheet - Google Patents

Abstract

The present invention provides an adhesive sheet for fixing portable device components, which includes an adhesive layer formed by using an adhesive composition, the adhesive composition containing an acrylic polymer as a base polymer, a tackifying resin, and Crosslinking agent. The monomer component constituting the acrylic polymer contains more than 50% by weight of C _1-6 alkyl (meth)acrylate. The content of the tackifying resin is an amount exceeding 10 parts by weight relative to 100 parts by weight of the acrylic polymer. The crosslinking agent includes an epoxy-based crosslinking agent and an isocyanate-based crosslinking agent.

Description

Adhesive sheet

The present invention relates to an adhesive sheet. In detail, it relates to an adhesive sheet suitable for fixing components constituting a portable device. This application claims priority based on Japanese Patent Application No. 2015-185861 filed on September 18, 2015 and Japanese Patent Application No. 2016-091340 filed on April 28, 2016, and all the contents of these applications It is incorporated into this specification as a reference.

Under normal circumstances, adhesives (also called pressure-sensitive adhesives. The same below) have the following properties: they present a soft solid (viscoelastic) state in a temperature region near room temperature, and are simply attached to Was attached to the body. Taking advantage of this property, adhesives are typically in the form of adhesive sheets, and are widely used for the purpose of joining, fixing, and protecting components in mobile phones and other portable devices. Patent documents 1 and 2 can be cited as technical documents related to double-sided tape used for fixing parts of mobile electronic devices. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Application Publication No. 2009-215355 [Patent Document 2] Japanese Patent Application Publication No. 2013-100485

[Problem to be solved by the invention] The portable device is carried by the user, so it is easy to adhere to secretions such as sebum or hand dirt, cosmetics or hairdressing agents, moisturizers, sunscreens and other chemicals or oils contained in foods. Especially in portable devices with touch panels that have become popular in recent years, the display includes a display/input that also functions as an input, and the user directly touches the display/input with a fingertip It can be operated on the surface, so there are more chances of sticking oil through the fingertips. In addition, in the so-called wearable device, there is a user wearing it in contact with the skin. In this use form, there are more opportunities for exposure to oils such as sebum or chemicals applied to the skin. If such oil comes into contact with the adhesive layer of the adhesive sheet of the fixing member, the adhesive absorbs the oil and softens, which may cause undesirable phenomena such as expansion, deformation, and reduction in cohesive force. In this regard, for example, in Patent Document 1, studies have been conducted on a double-sided adhesive sheet having the following properties: even if oil penetrates, the adhesive is difficult to swell, and when used for fixing parts, the adhesive does not ooze. On the other hand, since it is an adhesive sheet for fixing components, the retention performance of the components, that is, the performance of maintaining the components in a fixed state is of course important. In addition, the above-mentioned retention performance is the performance that will continue to be required after the adhesive sheet fixing member is used in the manufacturing process of the portable device, and it is the performance required before it comes into contact with the oil that may be generated after the portable device is manufactured. . However, in the prior art related to the improvement of the oil resistance of the adhesive sheet for fixing components, the retention performance of the adhesive sheet is often insufficient. With the diversification of the forms of portable devices (especially mobile electronic devices) or the widening of usage scenarios, the adhesive sheets used for fixing components are gradually required to have higher retention performance. The present invention was made in view of this fact, and its object is to provide an adhesive sheet that has high retention performance and is difficult to penetrate oil. [Technical Means to Solve the Problem] According to this specification, an adhesive sheet for fixing components in a portable device is provided. The adhesive sheet includes an adhesive layer formed using an adhesive composition, and the adhesive composition contains an acrylic polymer as a base polymer, a tackifying resin, and a crosslinking agent. The monomer component constituting the acrylic polymer contains more than 50% by weight of alkyl (meth)acrylate having an alkyl group with 1 to 6 carbon atoms at the end of the ester (hereinafter, sometimes expressed as "(methyl) ) C _1-6 alkyl acrylate"). The content of the tackifying resin is an amount exceeding 10 parts by weight relative to 100 parts by weight of the acrylic polymer. Moreover, the said crosslinking agent contains an epoxy type crosslinking agent and an isocyanate type crosslinking agent. The adhesive constituting the above-mentioned adhesive layer contains an acrylic polymer having C _1-6 alkyl (meth)acrylate as the main monomer component as a base polymer, and therefore it is difficult to absorb oil. In addition, by using an epoxy-based crosslinking agent and an isocyanate-based crosslinking agent in combination, the cohesive force of the adhesive layer can be increased and the retention performance of the adhesive sheet can be improved. Furthermore, the adhesive layer contains a specific amount or more of a tackifying resin, and therefore has good adhesion to the adherend. Therefore, it is possible to effectively suppress the penetration of oil from the interface between the adhesive layer and the adherend. As the above-mentioned tackifying resin, a phenol-based tackifying resin (for example, terpene phenol resin) can be preferably used. By containing phenolic tackifying resin in the adhesive layer, the adhesion to the adherend can be improved and the penetration of oil can be effectively prevented. The content of the phenol-based tackifying resin is preferably set to an amount exceeding 10 parts by weight with respect to 100 parts by weight of the acrylic polymer. In a preferred aspect of the adhesive sheet, the tackifying resin contained in the adhesive layer includes a tackifying resin with a hydroxyl value of 30 mgKOH/g or more. By making the adhesive layer contain a tackifying resin with a relatively high hydroxyl value as described above, the adhesion to the adherend can be improved, and the penetration of oil can be effectively suppressed. As the above-mentioned tackifying resin having a hydroxyl value of 30 mgKOH/g or more, for example, a phenol-based tackifying resin (typically terpene phenol resin) can be preferably used. It is preferable that the monomer component constituting the acrylic polymer contains a carboxyl group-containing monomer. As a result, there is a tendency that the cohesive force of the adhesive layer is increased, and thus the retention performance of the adhesive sheet is improved. The monomer component containing a carboxyl group-containing monomer can also advantageously contribute to the improvement of the adhesion between the adhesive layer and the adherend. Regarding the content of the carboxyl group-containing monomer in the monomer component, from the viewpoint of compatibility with other components, etc., it is generally appropriate to set it to about 0.5% by weight to 10% by weight. The content of the epoxy-based crosslinking agent is preferably less than 0.05 parts by weight based on 100 parts by weight of the acrylic polymer. By using the epoxy-based crosslinking agent in this amount in combination with the isocyanate-based crosslinking agent, there is a tendency that an adhesive layer with high cohesive force and good adhesion to the adherend is easily formed. Thereby, it is possible to realize an adhesive sheet that better suppresses the penetration of oil from the interface. In one aspect, the content of the epoxy-based crosslinking agent may be approximately 1/100 or less of the content of the isocyanate-based crosslinking agent. According to this aspect, the cohesive force and adhesion of the adhesive layer are combined at a higher level, and more excellent oil penetration resistance can be realized. The technology disclosed herein can be preferably applied to the adhesive sheet with the thickness of the adhesive layer of approximately 30 μm or less (for example, approximately 25 μm or less). If the thickness of the adhesive layer becomes smaller, the amount of oil per unit volume supplied to the adhesive will increase even if the adhesion amount of the oil is the same. In addition, if the thickness of the adhesive layer becomes smaller, in general, there is a tendency that the adhesion of the adhesive layer to the adherend is likely to decrease, and the oil at the interface between the adhesive layer and the adherend is likely to be generated. Infiltrate. Therefore, it is particularly meaningful to apply the technology disclosed here to inhibit the penetration of oil. The adhesive sheet disclosed here preferably has a 180-degree peel strength of approximately 17 N/25 mm or more. According to the adhesive sheet exhibiting this adhesive force, there is a tendency to suitably suppress the penetration of oil from the interface between the adhesive layer and the adherend. A preferred aspect of the adhesive sheet includes any of the adhesive layers disclosed herein, and a base film supporting the adhesive layer. By using the epoxy-based crosslinking agent and the isocyanate-based crosslinking agent in combination for the adhesive layer, even if the cohesive force of the adhesive layer is increased, the adhesion to the substrate film is not easily reduced. This can prevent oil from penetrating into the interface between the adhesive layer and the base film. The technology disclosed here can be preferably implemented in the form of a double-sided adhesive sheet (which can be a double-sided adhesive sheet with an adhesive on one surface and the other surface of the base film). The fixed part of the member of the double-sided adhesive sheet contains more interfaces than the fixed part of the member of the single-sided adhesive sheet, and therefore the oil easily penetrates from these interfaces. Therefore, it is particularly meaningful to apply the technique disclosed here to suppress the penetration of oil from the aforementioned interface.

啉、乙烯醚類等。 作為此處所揭示之技術中之丙烯酸系聚合物之一適宜例，可列舉共聚有含羧基單體作為上述其他單體之丙烯酸系聚合物。存在藉此而變得容易獲得凝集力高之黏著劑層之傾向。單體成分含有含羧基單體亦可有利地有助於黏著劑層與被接著體或基材膜之密接性提高。作為含羧基單體，可例示丙烯酸(AA)、甲基丙烯酸(MAA)、(甲基)丙烯酸羧基乙酯、(甲基)丙烯酸羧基戊酯、伊康酸、馬來酸、富馬酸、丁烯酸、異丁烯酸等。其中，作為較佳之含羧基單體，可列舉AA及MAA。特佳為AA。 作為此處所揭示之技術中之丙烯酸系聚合物之其他適宜例，可列舉共聚有含羥基單體作為上述其他單體之丙烯酸系聚合物。含羥基單體亦可與含羧基單體一同共聚。作為含羥基單體之例，可列舉：(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸3-羥基丙酯、(甲基)丙烯酸2-羥基丁酯、(甲基)丙烯酸4-羥基丁酯等(甲基)丙烯酸羥基烷基酯；聚丙二醇單(甲基)丙烯酸酯；N-羥基乙基(甲基)丙烯醯胺等。其中，作為較佳之含羥基單體，可列舉丙烯酸2-羥基乙酯或(甲基)丙烯酸4-羥基丁酯等般之於碳原子數為2～4左右之直鏈烷基之末端具有羥基之(甲基)丙烯酸羥基烷基酯。 於此處所揭示之技術中之丙烯酸系聚合物中，可於並不顯著損及本發明之效果之範圍內共聚(甲基)丙烯酸C_1-6 烷基酯以外之(甲基)丙烯酸烴基酯作為上述其他單體。此種(甲基)丙烯酸酯之例中，包括於酯末端具有脂環式基之脂環式(甲基)丙烯酸酯、或於酯末端具有碳原子數為7以上(典型而言7～20)之烷基的(甲基)丙烯酸烷基酯。作為脂環式(甲基)丙烯酸酯之例，可列舉：(甲基)丙烯酸環丙酯、(甲基)丙烯酸環丁酯、(甲基)丙烯酸環戊酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸環庚酯、(甲基)丙烯酸環辛酯、(甲基)丙烯酸異

酯、(甲基)丙烯酸二環戊酯等。作為(甲基)丙烯酸C_7-20 烷基酯之例，可列舉：(甲基)丙烯酸庚酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸異辛酯、(甲基)丙烯酸壬酯、(甲基)丙烯酸異壬酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸異癸酯、(甲基)丙烯酸月桂酯、(甲基)丙烯酸十四烷基酯、(甲基)丙烯酸硬脂酯、(甲基)丙烯酸異硬脂酯等。 上述「其他單體」可單獨使用1種或組合使用2種以上。其他單體之合計含量例如可設為所有單體成分之大致未達50重量%(典型而言0.001～40重量%左右)，通常情況下適當的是設為大致25重量%以下(典型而言0.01～25重量%左右、例如0.1～20重量%左右)。 於使用含羧基單體作為上述其他單體之情形時，其使用量通常適當的是設為所有單體成分之大致0.1～20重量%(較佳為0.1～15重量%左右、典型而言0.2～12重量%左右、例如0.5～10重量%左右)。若含羧基單體之使用量變多，則存在黏著劑層之凝集力一般而言提高之傾向。藉由將含羧基單體之使用量設為上述範圍，而適宜地發揮後述增黏樹脂之調配效果，可適宜地實現對於被接著體及基材膜顯示出良好之密接性的黏著劑層。於一態樣中，含羧基單體之含量可設為所有單體成分之大致1～8重量%(例如大致2～7重量%)。 又，於使用含羥基單體作為上述其他單體之情形時，其含量通常適當的是設為所有單體成分之大致0.001～10重量%(例如大致0.01～5重量%、典型而言大致0.02～2重量%)。 丙烯酸系聚合物之共聚組成適當的是以該聚合物之Tg成為大致-15℃以下(典型而言大致-70℃以上且-15℃以下)之方式設計。此處，所謂丙烯酸系聚合物之Tg，係指根據用於合成該聚合物之單體成分之組成藉由Fox公式而求出之Tg。所謂Fox公式係如下所示般共聚物之Tg、與將構成該共聚物之各單體均聚而成之均聚物之玻璃轉移溫度Tgi之關係式。 1/Tg＝Σ(Wi/Tgi) 再者，於上述Fox公式中，Tg表示共聚物之玻璃轉移溫度(單位：K)，Wi表示該共聚物中之單體i之重量分率(重量基準之共聚比例)，Tgi表示單體i之均聚物之玻璃轉移溫度(單位：K)。 作為用於算出Tg之均聚物之玻璃轉移溫度，使用公知資料中所記載之值。例如，關於以下所列舉之單體，使用以下之值作為該單體之均聚物之玻璃轉移溫度。 丙烯酸2-乙基己酯    -70℃ 丙烯酸正丁酯          -55℃ 丙烯酸乙酯             -22℃ 丙烯酸甲酯             8℃ 甲基丙烯酸甲酯       105℃ 丙烯酸2-羥基乙酯    -15℃ 丙烯酸4-羥基丁酯    -40℃ 乙酸乙烯酯             32℃ 苯乙烯                    100℃ 丙烯酸                    106℃ 甲基丙烯酸             228℃ 關於上述所例示以外之單體之均聚物之玻璃轉移溫度，使用「聚合物手冊(Polymer Handbook)」(第3版，約翰威立父子國際出版公司(John Wiley ＆ Sons, Inc)，1989年)所記載之數值。關於該文獻中記載有複數種值之單體，採用最高之值。 關於上述文獻中亦未記載均聚物之玻璃轉移溫度之單體，使用藉由以下之測定方法而獲得之值。 具體而言，於具備溫度計、攪拌機、氮氣導入管及回流冷凝器之反應器中投入單體100重量份、2,2'-偶氮二異丁腈0.2重量份及作為聚合溶劑之乙酸乙酯200重量份，一面使氮氣流通一面進行1小時攪拌。如此般將聚合系統內之氧去除後，升溫至63℃而進行10小時之反應。其次，冷卻至室溫，獲得固形物成分濃度為33重量%之均聚物溶液。其次，將該均聚物溶液流延塗佈於剝離襯墊上，進行乾燥而製作厚度約2 mm之試驗樣品(片狀之均聚物)。將該試驗樣品衝壓成直徑7.9 mm之圓盤狀，藉由平行板夾住，使用黏彈性試驗機(TA Instruments Japan公司製造，機器種類名「ARES」)，一面賦予頻率1 Hz之剪切應變，一面於-70～150℃之溫度範圍內以5℃/分鐘之升溫速度藉由剪切模式而測定黏彈性，將tanδ(損耗正切)之峰頂溫度作為均聚物之Tg。 雖然並無特別限定，但自對被接著體或基材膜之密接性之觀點考慮，有利的是丙烯酸系聚合物之Tg為大致-25℃以下，較佳為大致-35℃以下，更佳為大致-40℃以下。又，自黏著劑層之凝集力之觀點考慮，有利的是丙烯酸系聚合物之Tg為大致-65℃以上，較佳為大致-60℃以上，更佳為大致-55℃以上。此處所揭示之技術可藉由上述丙烯酸系聚合物之Tg為大致-65℃以上且-35℃以下(例如大致-55℃以上且-40℃以下)之態樣而較佳地實施。丙烯酸系聚合物之Tg可藉由適宜改變單體組成(亦即，用於合成該聚合物之單體之種類或使用量比)而調整。 獲得丙烯酸系聚合物之方法並無特別限定，可適宜採用溶液聚合法、乳化聚合法、塊狀聚合法、懸浮聚合法、光聚合法等作為丙烯酸系聚合物之合成方法而已知之各種聚合方法。例如，可較佳地採用溶液聚合法。作為進行溶液聚合時之單體供給方法，可適宜採用一次性供給所有單體原料之一次裝入方式、連續供給(滴加)方式、分割供給(滴加)方式等。聚合溫度可根據所使用之單體及溶劑之種類、聚合起始劑之種類等而適宜選擇，例如可設為20℃～170℃左右(典型而言40℃～140℃左右)。於較佳之一態樣中，可將聚合溫度設為大致75℃以下(更佳為大致65℃以下、例如大致45℃～65℃左右)。 溶液聚合中所使用之溶劑(聚合溶劑)可自先前公知之有機溶劑中適宜選擇。例如可使用選自如下溶劑中之任意1種溶劑、或2種以上之混合溶劑：甲苯等芳香族化合物類(典型而言芳香族烴類)；乙酸乙酯等乙酸酯類；己烷或環己烷等脂肪族或脂環式烴類；1,2-二氯乙烷等鹵化烷烴類；異丙醇等低級醇類(例如碳原子數為1～4之一元醇類)；第三丁基甲基醚等醚類；甲基乙基酮等酮類等。 聚合中所使用之起始劑可根據聚合方法之種類而自先前公知之聚合起始劑中適宜選擇。例如可較佳地使用2,2'-偶氮二異丁腈(AIBN)等偶氮系聚合起始劑之1種或2種以上。作為聚合起始劑之其他例，可列舉：過硫酸鉀等過硫酸鹽；過氧化苯甲醯、過氧化氫等過氧化物系起始劑；經苯基取代之乙烷等經取代之乙烷系起始劑；芳香族羰基化合物等。作為聚合起始劑之進而其他之例，可列舉利用過氧化物與還原劑之組合的氧化還原系起始劑。此種聚合起始劑可單獨使用1種或組合使用2種以上。聚合起始劑之使用量只要為通常之使用量即可，例如可自相對於所有單體成分100重量份而為大致0.005～1重量份左右(典型而言大致0.01～1重量份左右)之範圍內選擇。 根據上述溶液聚合，可獲得丙烯酸系聚合物溶解於有機溶劑中之形態之聚合反應液。此處所揭示之技術中之黏著劑層可由黏著劑組合物而形成，上述黏著劑組合物包含上述聚合反應液或對該反應液實施適當之後處理而獲得之丙烯酸系聚合物溶液。作為上述丙烯酸系聚合物溶液，可使用將上述聚合反應液視需要製備成適當之黏度(濃度)者。或者亦可使用藉由溶液聚合以外之聚合方法(例如乳液聚合、光聚合、塊狀聚合等)而合成丙烯酸系聚合物，使該丙烯酸系聚合物溶解於有機溶劑中而製備之丙烯酸系聚合物溶液。 此處所揭示之技術中之基礎聚合物(適宜的是丙烯酸系聚合物)之重量平均分子量(Mw)並無特別限定，例如可為大致10×10⁴ ～500×10⁴ 之範圍。自黏著性能之觀點考慮，較佳為基礎聚合物之Mw處於大致30×10⁴ ～200×10⁴ (更佳為大致45×10⁴ ～150×10⁴ 、典型而言大致65×10⁴ ～130×10⁴ )之範圍內。此處所謂Mw係指藉由GPC(凝膠滲透層析法)而獲得之標準聚苯乙烯換算之值。作為GPC裝置，例如可使用機器種類名「HLC-8320GPC」(管柱：TSKgelGMH-H(S)，東曹公司製造)。 (交聯劑) 上述交聯劑包含環氧系交聯劑與異氰酸酯系交聯劑。藉由組合使用該等2種交聯劑，可使黏著劑層之凝集力充分提高。又，於包含基材膜(支持基材)之構成中，可確保對該基材膜之良好之密接性。此處所揭示之技術中之黏著劑層可以交聯反應後之形態、交聯反應前之形態、局部地經交聯反應之形態、該等之中間或複合形態等而含有上述交聯劑。上述交聯劑典型而言主要係以交聯反應後之形態而含有於黏著劑層。 作為環氧系交聯劑，可並無特別限制地使用於1分子中具有2個以上之環氧基之化合物。較佳為於1分子中具有3～5個環氧基之環氧系交聯劑。環氧系交聯劑可單獨使用1種或組合使用2種以上。 雖然並無特別限定，但作為環氧系交聯劑之具體例，例如可列舉：N,N,N',N'-四縮水甘油基-間二甲苯二胺、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、聚乙二醇二縮水甘油醚、聚甘油聚縮水甘油醚等。作為環氧系交聯劑之市售品，可列舉：三菱瓦斯化學公司製造之商品名「TETRAD-C」及商品名「TETRAD-X」、DIC公司製造之商品名「Epiclon CR-5L」、長瀨化成公司製造之商品名「DENACOL EX-512」、日產化學工業公司製造之商品名「TEPIC-G」等。 環氧系交聯劑之使用量並無特別限定。環氧系交聯劑之使用量例如可相對於丙烯酸系聚合物100重量份而設為超過0重量份且大致1重量份以下(典型而言大致0.001～0.5重量份)。自適宜地發揮凝集力之提高效果之觀點考慮，通常情況下環氧系交聯劑之使用量適當的是相對於丙烯酸系聚合物100重量份而設為大致0.002重量份以上，較佳為大致0.005重量份以上，更佳為大致0.008重量份以上。又，自避免對被接著體或基材膜之密接性過於降低之觀點考慮，通常情況下環氧系交聯劑之使用量適當的是相對於丙烯酸系聚合物100重量份而設為大致0.2重量份以下，較佳為大致0.1重量份以下，更佳為大致未達0.05重量份，進而更佳為大致未達0.03重量份(例如大致0.025重量份以下)。 作為異氰酸酯系交聯劑，可較佳地使用多官能異氰酸酯(係指每1分子中具有平均2個以上之異氰酸酯基之化合物，包含具有異氰尿酸酯結構者)。異氰酸酯系交聯劑可單獨使用1種或組合使用2種以上。 作為多官能異氰酸酯之例，可列舉脂肪族聚異氰酸酯類、脂環族聚異氰酸酯類、芳香族聚異氰酸酯類等。 作為脂肪族聚異氰酸酯類之具體例，可列舉：1,2-伸乙基二異氰酸酯；1,2-四亞甲基二異氰酸酯、1,3-四亞甲基二異氰酸酯、1,4-四亞甲基二異氰酸酯等四亞甲基二異氰酸酯；1,2-六亞甲基二異氰酸酯、1,3-六亞甲基二異氰酸酯、1,4-六亞甲基二異氰酸酯、1,5-六亞甲基二異氰酸酯、1,6-六亞甲基二異氰酸酯、2,5-六亞甲基二異氰酸酯等六亞甲基二異氰酸酯；2-甲基-1,5-戊烷二異氰酸酯、3-甲基-1,5-戊烷二異氰酸酯、離胺酸二異氰酸酯等。 作為脂環族聚異氰酸酯類之具體例，可列舉：異佛爾酮二異氰酸酯；1,2-環己基二異氰酸酯、1,3-環己基二異氰酸酯、1,4-環己基二異氰酸酯等環己基二異氰酸酯；1,2-環戊基二異氰酸酯、1,3-環戊基二異氰酸酯等環戊基二異氰酸酯；氫化苯二甲基二異氰酸酯、氫化甲苯二異氰酸酯、氫化二苯基甲烷二異氰酸酯、氫化四甲基二甲苯二異氰酸酯、4,4'-二環己基甲烷二異氰酸酯等。 作為芳香族聚異氰酸酯類之具體例，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、2,4'-二苯基甲烷二異氰酸酯、2,2'-二苯基甲烷二異氰酸酯、4,4'-二苯醚二異氰酸酯、2-硝基二苯基-4,4'-二異氰酸酯、2,2'-二苯基丙烷-4,4'-二異氰酸酯、3,3'-二甲基二苯基甲烷-4,4'-二異氰酸酯、4,4'-二苯基丙烷二異氰酸酯、間苯二異氰酸酯、對苯二異氰酸酯、萘-1,4-二異氰酸酯、萘-1,5-二異氰酸酯、3,3'-二甲氧基二苯基-4,4'-二異氰酸酯、苯二甲基-1,4-二異氰酸酯、苯二甲基-1,3-二異氰酸酯等。 作為較佳之多官能異氰酸酯，可例示於每1分子中平均具有3個以上之異氰酸酯基之多官能異氰酸酯。該3官能以上之異氰酸酯可為2官能或3官能以上之異氰酸酯之多聚物(典型而言二聚物或三聚物)、衍生物(例如多元醇與2分子以上之多官能異氰酸酯之加成反應產物)、聚合物等。例如可列舉二苯基甲烷二異氰酸酯之二聚物或三聚物、六亞甲基二異氰酸酯之異氰尿酸酯體(異氰尿酸酯結構之三聚物加成物)、三羥甲基丙烷與甲苯二異氰酸酯之反應產物、三羥甲基丙烷與六亞甲基二異氰酸酯之反應產物、聚亞甲基聚苯基異氰酸酯、聚醚聚異氰酸酯、聚酯聚異氰酸酯等多官能異氰酸酯。作為該多官能異氰酸酯之市售品，可列舉：旭化成化學公司製造之商品名「Duranate TPA-100」、日本聚胺酯工業公司製造之商品名「Coronate L」、日本聚胺酯工業公司製造之商品名「Coronate HL」、日本聚胺酯工業公司製造之商品名「Coronate HK」、日本聚胺酯工業公司製造之商品名「Coronate HX」、日本聚胺酯工業公司製造之商品名「Coronate 2096」等。 異氰酸酯系交聯劑之使用量並無特別限定。異氰酸酯系交聯劑之使用量例如可相對於丙烯酸系聚合物100重量份而設為超過0重量份且大致10重量份以下(典型而言大致0.01重量份以上且10重量份以下)。通常情況下，異氰酸酯系交聯劑之使用量適當的是相對於丙烯酸系聚合物100重量份而為大致0.1重量份以上且8重量份以下，較佳為大致0.3重量份以上且5重量份以下，更佳為大致0.5重量份以上且未達4重量份(例如大致0.7重量份以上且3.5重量份以下)。藉由將該量之異氰酸酯系交聯劑與環氧系交聯劑組合使用，可以較高水準兼具對被接著體及基材膜之密接性與凝集力。藉此可實現顯示出良好之防油分滲透性(耐油性)、且保持性能(黏著劑層之凝集力)亦優異之黏著片材。 於此處所揭示之技術中，環氧系交聯劑之含量與異氰酸酯系交聯劑之含量之關係並無特別限定。環氧系交聯劑之含量例如可設為異氰酸酯系交聯劑之含量之大致1/50以下。自更適宜地兼具對被接著體及基材膜之密接性與凝集力之觀點考慮，環氧系交聯劑之含量適當的是設為異氰酸酯系交聯劑之含量之大致1/75以下，較佳為設為大致1/100以下(例如1/150以下)。又，自適宜地發揮藉由組合使用環氧系交聯劑與異氰酸酯系交聯劑所帶來之效果之觀點考慮，通常情況下環氧系交聯劑之含量適當的是設為異氰酸酯系交聯劑之含量之大致1/1000以上、例如大致1/500以上。 此處所揭示之技術中之黏著劑組合物亦可於並不顯著損及本發明之效果之限度內，除了環氧系交聯劑及異氰酸酯系交聯劑以外，視需要含有其他交聯劑。作為此種其他交聯劑之例，可列舉

唑啉系交聯劑、碳二醯亞胺系交聯劑、肼系交聯劑、氮丙啶系交聯劑、金屬螯合物系交聯劑等。或者亦可為不含上述其他交聯劑之黏著劑組合物。 (增黏樹脂) 作為上述增黏樹脂，可使用選自酚系增黏樹脂、萜系增黏樹脂、改性萜系增黏樹脂、松香系增黏樹脂、烴系增黏樹脂、環氧系增黏樹脂、聚醯胺系增黏樹脂、彈性體系增黏樹脂、酮系增黏樹脂等公知之各種增黏樹脂中之1種或2種以上。 酚系增黏樹脂之例中包括萜酚樹脂、氫化萜酚樹脂、烷基酚樹脂及松香酚樹脂。 所謂萜酚樹脂係指包含萜殘基及酚殘基之聚合物，其係包含萜類與酚化合物之共聚物(萜-酚共聚物樹脂)、對萜類之均聚物或共聚物進行酚改性而成者(酚改性萜樹脂)兩者的概念。作為構成此種萜酚樹脂之萜類之適宜例，可列舉α-蒎烯、β-蒎烯、檸檬烯(包含d體、l體及d/l體(雙戊烯))等單萜類。所謂氫化萜酚樹脂係指具有對此種萜酚樹脂進行氫化而成之結構的氫化萜酚樹脂。有時亦稱為氫化萜酚樹脂。 烷基酚樹脂係由烷基酚與甲醛而獲得之樹脂(油性酚樹脂)。作為烷基酚樹脂之例，可列舉酚醛清漆型及可溶酚醛型。 松香酚樹脂典型而言為松香類或上述各種松香衍生物(包含松香酯類、不飽和脂肪酸改性松香類及不飽和脂肪酸改性松香酯類)之酚改性物。松香酚樹脂之例包括藉由如下方法而獲得之松香酚樹脂：於松香類或上述各種松香衍生物上，藉由酸觸媒加成酚並進行熱聚合之方法等。 萜系增黏樹脂之例中包含α-蒎烯、β-蒎烯、d-檸檬烯、l-檸檬烯、雙戊烯等萜類(典型而言單萜類)之聚合物。可為1種萜類之均聚物，亦可為2種以上萜類之共聚物。作為1種萜類之均聚物，可列舉α-蒎烯聚合物、β-蒎烯聚合物、雙戊烯聚合物等。作為改性萜樹脂之例，可列舉對上述萜樹脂進行改性而成者。具體而言，可例示苯乙烯改性萜樹脂、氫化萜樹脂等。 此處所謂松香系增黏樹脂之概念中包含松香類及松香衍生物樹脂兩者。松香類之例中包含：松脂膠、木松香、高油松香等未改性松香(生松香)；藉由氫化、歧化、聚合等對該等未改性松香進行改性而成之改性松香(氫化松香、歧化松香、聚合松香、經其他化學修飾之松香等)。 松香衍生物樹脂典型而言為如上所述之松香類之衍生物。此處所謂松香系樹脂之概念中包括未改性松香之衍生物及改性松香(包含氫化松香、歧化松香及聚合松香)之衍生物。可列舉：例如作為未改性松香與醇類之酯之未改性松香酯，或作為改性松香與醇類之酯的改性松香酯等松香酯類；例如利用不飽和脂肪酸對松香類進行改性而成之不飽和脂肪酸改性松香類；例如利用不飽和脂肪酸對松香酯類進行改性而成之不飽和脂肪酸改性松香酯類；例如對松香類或上述各種松香衍生物(包含松香酯類、不飽和脂肪酸改性松香類及不飽和脂肪酸改性松香酯類)之羧基進行還原處理而成之松香醇類；例如松香類或上述各種松香衍生物之金屬鹽等。作為松香酯類之具體例，可列舉未改性松香或改性松香(氫化松香、歧化松香、聚合松香等)之甲酯、三乙二醇酯、甘油酯、季戊四醇酯等。 作為烴系增黏樹脂之例，可列舉：脂肪族系烴樹脂、芳香族系烴樹脂、脂肪族系環烴樹脂、脂肪族-芳香族系石油樹脂(苯乙烯-烯烴系共聚物等)、脂肪族-脂環族系石油樹脂、氫化烴樹脂、薰草咔系樹脂、薰草咔-茚系樹脂等各種烴系樹脂。 增黏樹脂之軟化點並無特別限定。自凝集力提高之觀點考慮，於一態樣中，可較佳地採用軟化點(軟化溫度)為大致80℃以上(較佳為大致100℃以上)之增黏樹脂。此處所揭示之技術可藉由具有上述軟化點之增黏樹脂於黏著劑層中所含之增黏樹脂總體中超過50重量%(更佳為超過70重量%、例如超過90重量%)之態樣而較佳地實施。例如可較佳地使用具有此種軟化點之酚系增黏樹脂(萜酚樹脂等)。於較佳之一態樣中，可使用軟化點為大致135℃以上(進而為大致140℃以上)之萜酚樹脂。增黏樹脂之軟化點之上限並無特別限制。自對被接著體或基材膜之密接性之觀點考慮，於一態樣中，可較佳地使用軟化點為大致200℃以下(更佳為大致180℃以下)之增黏樹脂。再者，增黏樹脂之軟化點可依據JIS K2207中所規定之軟化點試驗方法(環球法)而測定。 上述增黏樹脂之含量較佳為設為相對於丙烯酸系聚合物100重量份而超過10重量份之量。藉此可實現適宜地發揮提高對被接著體之密接性之效果、顯示出良好之防油滲透性之黏著片材。自獲得更高之密接性之觀點考慮，增黏樹脂相對於丙烯酸系聚合物100重量份之含量較佳為大致15重量份以上，更佳為大致18重量份以上(例如大致20重量份以上)。此處所揭示之技術亦可藉由增黏樹脂相對於丙烯酸系聚合物100重量份之含量而為大致25重量份以上之態樣而較佳地實施。增黏樹脂之含量之上限並無特別限定。自與基礎聚合物(丙烯酸系聚合物)之相容性或初始接著性之觀點考慮，於一態樣中，通常情況下增黏樹脂相對於丙烯酸系聚合物100重量份之含量適當的是設為大致70重量份以下，較佳為設為大致55重量份以下，更佳為設為大致45重量份以下(例如大致40重量份以下)。 作為較佳之一態樣，可列舉上述增黏樹脂包含1種或2種以上之酚系增黏樹脂(典型而言萜酚樹脂)之態樣。藉由使用酚系增黏樹脂，可改善黏著劑層對被接著體之密接性，有效地抑制自與被接著體之界面之油分滲入。又，酚增黏樹脂例如具有與松香系增黏樹脂相比而言對油之親和性較低之傾向。因此，含有酚增黏樹脂亦可於抑制油分向黏著劑層內(吸油) 滲入之方面發揮作用。此處所揭示之技術例如可藉由增黏樹脂之總量之大致25重量%以上(更佳為大致30重量%以上)為萜酚樹脂之態樣而較佳地實施。可為增黏樹脂之總量之大致50重量%以上為萜酚樹脂，亦可為大致80重量%以上(例如大致90重量%以上)為萜酚樹脂。亦可為增黏樹脂實質上全部(例如大致95～100重量%、進而大致99～100重量%)為萜酚樹脂。酚系增黏樹脂(例如萜酚樹脂)之含量適當的是相對於丙烯酸系聚合物100重量份而為大致5～55重量份(例如大致超過10重量份且55重量份以下)之範圍內，較佳為大致15～45重量份(例如大致20～40重量份)之範圍內。 雖然並無特別限定，但作為此處所揭示之技術中之增黏樹脂，可使用羥值高於20 mgKOH/g者，其中可較佳地使用羥值為30 mgKOH/g以上之增黏樹脂。以下，有時將羥值為30 mgKOH/g以上之增黏樹脂稱為「高羥值樹脂」。根據包含此種高羥值樹脂之增黏樹脂，可實現對被接著體之密接性優異、且凝集力較高之黏著劑層。使用高羥值樹脂亦可於降低黏著劑層之親油性之方面發揮作用。於較佳之一態樣中，上述增黏樹脂亦可含有羥值為50 mgKOH/g以上(更佳為70 mgKOH/g以上)之高羥值樹脂。 此處，作為上述羥值之值，可採用藉由JIS K0070：1992中所規定之電位差滴定法而測定之值。具體之測定方法如下所示。 [羥值之測定方法] 1.試劑 (1)作為乙醯化試劑，使用如下之試劑：取約12.5 g(約11.8 mL)之乙酸酐，於其中加入吡啶而使總量為50 mL，進行充分攪拌而成者。或者使用如下之試劑：取約25 g(約23.5 mL)之乙酸酐，於其中加入吡啶而使總量為100 mL，進行充分攪拌而成者。 (2)作為測定試劑，使用0.5 mol/L之氫氧化鉀乙醇溶液。 (3)此外，準備甲苯、吡啶、乙醇及蒸餾水。 2.操作 (1)於平底燒瓶中準確稱量採取約2 g試樣，加入乙醯化試劑5 mL及吡啶10 mL，安裝空氣冷凝管。 (2)將上述燒瓶於100℃之浴中加熱70分鐘後放置冷卻，自冷凝管之上部加入甲苯35 mL作為溶劑並進行攪拌後，加入蒸餾水1 mL並進行攪拌，藉此將乙酸酐分解。為了使分解完全而再次於浴中進行10分鐘加熱，放置冷卻。 (3)藉由乙醇5 mL對冷凝管進行清洗，將其取出。其次，加入吡啶50 mL作為溶劑並進行攪拌。 (4)使用全移液管加入25 mL之0.5 mol/L氫氧化鉀乙醇溶液。 (5)藉由0.5 mol/L氫氧化鉀乙醇溶液進行電位差滴定。將所獲得之滴定曲線之反曲點作為終點。 (6)空白試驗係不放入試樣而進行上述(1)～(5)。 3.計算 藉由以下之式而算出羥值。 羥值(mgKOH/g)＝[(B－C)×f×28.05]/S＋D 此處， B：空白試驗所使用之0.5 mol/L氫氧化鉀乙醇溶液之量(mL)、 C：試樣所使用之0.5 mol/L氫氧化鉀乙醇溶液之量(mL)、 f：0.5 mol/L氫氧化鉀乙醇溶液之因數、 S：試樣之重量(g)、 D：酸值、 28.05：氫氧化鉀之分子量56.11之1/2。 作為高羥值樹脂，可使用上述各種增黏樹脂中具有特定值以上之羥值者。高羥值樹脂可單獨使用1種或組合使用2種以上。例如，作為高羥值樹脂，可較佳地採用羥值為30 mgKOH/g以上之酚系增黏樹脂。於較佳之一態樣中，作為增黏樹脂，至少使用羥值為30 mgKOH/g以上之萜酚樹脂。萜酚樹脂可藉由酚之共聚比例而任意地控制羥值，因此較佳。 高羥值樹脂之羥值之上限並無特別限定。自與基礎聚合物之相容性等觀點考慮，高羥值樹脂之羥值通常適當的是大致200 mgKOH/g以下，較佳為大致180 mgKOH/g以下，更佳為大致160 mgKOH/g以下，進而更佳為大致140 mgKOH/g以下。此處所揭示之技術可藉由增黏樹脂包含羥值為30～160 mgKOH/g之高羥值樹脂(例如酚系增黏樹脂、較佳為萜酚樹脂)之態樣而較佳地實施。 雖然並無特別限定，但於使用高羥值樹脂之情形時，高羥值樹脂(例如萜酚樹脂)於黏著劑層中所含之增黏樹脂總體中所占之比例例如可設為大致25重量%以上，較佳為大致30重量%以上，更佳為大致50重量%以上(例如大致80重量%以上、典型而言大致90重量%以上)。亦可為增黏樹脂實質上全部(例如大致95～100重量%、進而大致99～100重量%)為高羥值樹脂。 作為高羥值樹脂，亦可組合使用羥值未達70 mgKOH/g之樹脂R1與羥值為70 mgKOH/g以上之樹脂R2。雖然並無特別限定，但樹脂R2之含量可設為樹脂R1之含量之0.2倍～5倍左右，通常適當的是設為0.3倍～3倍左右。亦可將樹脂R2之含量設為樹脂R1之含量之1倍～3倍左右。 (其他添加劑) 黏著劑組合物中，除了上述各成分以外，亦可視需要含有調平劑、交聯助劑、塑化劑、軟化劑、抗靜電劑、抗老化劑、紫外線吸收劑、抗氧化劑、光穩定劑等黏著劑組合物之領域中一般的各種添加劑。關於此種各種添加劑，可根據慣例而使用先前公知者，因並未特別對本發明賦予特徵，故省略詳細之說明。 此處所揭示之黏著劑層(包含黏著劑之層)可為由水系黏著劑組合物、溶劑型黏著劑組合物、熱熔型黏著劑組合物、活性能量線硬化型黏著劑組合物而形成之黏著劑層。所謂水系黏著劑組合物，係指於以水作為主成分之溶劑(水系溶劑)中含有黏著劑(黏著劑層形成成分)之形態之黏著劑組合物，典型而言包含被稱為水分散型黏著劑組合物(黏著劑之至少一部分分散於水中之形態之組合物)等者。又，所謂溶劑型黏著劑組合物，係指於有機溶劑中含有黏著劑之形態之黏著劑組合物。此處所揭示之技術自黏著特性等觀點考慮，可藉由包含由溶劑型黏著劑組合物形成之黏著劑層之態樣而較佳地實施。 此處所揭示之黏著劑層可藉由先前公知之方法而形成。例如可採用如下方法：於具有剝離性之表面(剝離面)或非剝離性之表面上賦予黏著劑組合物並使其乾燥，藉此形成黏著劑層。於具有基材膜之構成之黏著片材中，例如可採用於該基材膜上直接賦予(典型而言塗佈)黏著劑組合物並使其乾燥，藉此形成黏著劑層之方法(直接法)。又，亦可採用於具有剝離性之表面(剝離面)上賦予黏著劑組合物並使其乾燥，藉此於該表面上形成黏著劑層，並將該黏著劑層轉印至基材膜上之方法(轉印法)。自生產性之觀點考慮，較佳為轉印法。作為上述剝離面，可利用剝離襯墊之表面或經剝離處理之基材膜背面等。再者，此處所揭示之黏著劑層典型而言係連續地形成，但並不限定於此種形態，例如亦可為以點狀、條紋狀等規則或無規之圖案而形成之黏著劑層。 黏著劑組合物之塗佈例如可使用凹版輥塗佈機、模嘴塗佈機、棒式塗佈機等先前公知之塗佈機而進行。或者亦可藉由含浸或淋幕式塗佈法等而塗佈黏著劑組合物。 自促進交聯反應、提高製造效率等觀點考慮，黏著劑組合物之乾燥較佳為於加熱下進行。乾燥溫度例如可設為40～150℃左右，通常較佳為設為60～130℃左右。亦可於使黏著劑組合物乾燥後，進而以黏著劑層內之成分移行之調整、交聯反應之進行、基材膜或黏著劑層內可能存在之應變之緩和等為目的而進行老化。 黏著劑層之厚度並無特別限制。自避免黏著片材過度變厚之觀點考慮，黏著劑層之厚度通常適當的是大致100 μm以下，較佳為大致70 μm以下，更佳為大致50 μm以下，進而更佳為大致30 μm以下。於較佳之一態樣中，黏著劑層之厚度可為大致28 μm以下，亦可為大致25 μm以下(例如未達25 μm)，進而亦可為大致20 μm以下。一般情況下若黏著劑層之厚度變小，則對被接著體之密接性降低，存在變得容易產生自與該被接著體之界面之油分滲入的傾向。因此，應用此處所揭示之技術防止自上述界面之油分滲入特別有意義。亦可為於基材膜之單面或兩面上具有該厚度之黏著劑層之黏著片材。 黏著劑層之厚度之下限並無特別限制，自對被接著體之密接性之觀點考慮，有利的是設為大致4 μm以上，較佳為大致6 μm以上，更佳為大致10 μm以上(例如大致15 μm以上)。亦可為於基材膜之單面或兩面上具有該厚度之黏著劑層之黏著片材。 ＜基材膜＞ 於包含基材膜之態樣之黏著片材中，作為該基材膜，可較佳地使用包含樹脂膜作為基礎膜者。上述基礎膜典型而言為可獨立地維持形狀之(非依存性之)構件。此處所揭示之技術中之基材膜可為由此種基礎膜實質上構成者。或者上述基材膜亦可為除了上述基礎膜以外亦包含輔助層者。作為上述輔助層之例，可列舉設於上述基礎膜之表面的底塗層、抗靜電層、著色層等。 上述樹脂膜係以樹脂材料作為主成分(於該樹脂膜中含有超過50重量%之成分)之薄膜。作為樹脂膜之例，可列舉：聚乙烯(PE)、聚丙烯(PP)、乙烯-丙烯共聚物等聚烯烴系樹脂膜；聚對苯二甲酸乙二酯(PET)、聚對苯二甲酸丁二酯(PBT)、聚萘二甲酸乙二酯(PEN)等聚酯系樹脂膜；氯乙烯系樹脂膜；乙酸乙烯酯系樹脂膜；聚醯亞胺系樹脂膜；聚醯胺系樹脂膜；氟樹脂膜；塞璐芬等。樹脂膜亦可為天然橡膠膜、丁基橡膠膜等橡膠系膜。其中，自處理性、加工性之觀點考慮，較佳為聚酯膜，其中特佳為PET膜。再者，於本說明書中，所謂「樹脂膜」典型而言為非多孔質之片材，其係與所謂不織布或織布相區分之概念(換而言之為將不織布或織布除外之概念)。 於上述樹脂膜(例如PET膜)中，亦可視需要調配填充劑(無機填充劑、有機填充劑等)、著色劑、分散劑(界面活性劑等)、抗老化劑、抗氧化劑、紫外線吸收劑、抗靜電劑、潤滑劑、塑化劑等各種添加劑。各種添加劑之調配比例通常為大致未達30重量%(例如大致未達20重量%、典型而言大致未達10重量%)左右。 上述樹脂膜可為單層結構，亦可為具有2層、3層或其以上之多層結構者。自形狀穩定性之觀點考慮，樹脂膜較佳為單層結構。於多層結構之情形時，較佳為至少一個層(較佳為所有層)為具有上述樹脂(例如聚酯系樹脂)之連續結構之層。樹脂膜之製造方法只要適宜採用先前公知之方法即可，並無特別限定。例如可適宜採用擠出成形、吹脹成形、T型模頭流延成形、砑光輥成形等先前公知之一般的膜成形方法。 於包含基材膜之態樣之黏著片材中，該基材膜之厚度並無特別限定。自避免黏著片材過度變厚之觀點考慮，基材膜之厚度例如可設為大致200 μm以下、較佳為大致150 μm以下、更佳為大致100 μm以下。根據黏著片材之使用目的或使用態樣，基材膜之厚度可為大致70 μm以下，亦可為大致50 μm以下，亦可為大致30 μm以下(例如大致25 μm以下)。於一態樣中，基材膜之厚度可為大致20 μm以下，亦可為大致15 μm以下，亦可為大致10 μm以下(例如大致5 μm以下)。藉由使基材膜之厚度變小，即使黏著片材之總厚度相同，亦可使黏著劑層之厚度更大。這一情況自與基材之密接性提高之觀點考慮可變得有利。基材膜之厚度之下限並無特別限制。自黏著片材之操作性(處理性)或加工性等觀點考慮，基材膜之厚度通常為大致0.5 μm以上(例如1 μm以上)，較佳為大致2 μm以上、例如大致4 μm以上。於一態樣中，基材膜之厚度可設為大致6 μm以上，亦可為大致8 μm以上，亦可為大致10 μm以上(例如超過10 μm)。 亦可對基材膜之表面實施電暈放電處理、電漿處理、紫外線照射處理、酸處理、鹼處理、底塗劑之塗佈等先前公知之表面處理。此種表面處理可為用以提高基材膜與黏著劑層之密接性、換而言之黏著劑層對基材膜之抓固性之處理。 ＜剝離襯墊＞ 於此處所揭示之技術中，於黏著劑層之形成、黏著片材之製作、使用前之黏著片材之保存、流通、形狀加工等時，可使用剝離襯墊。作為剝離襯墊，並無特別限定，例如可使用於樹脂膜或紙等襯墊基材之表面上具有剝離處理層之剝離襯墊、或者包含氟系聚合物(聚四氟乙烯等)或聚烯烴系樹脂(聚乙烯、聚丙烯等)之低接著性材料的剝離襯墊等。上述剝離處理層例如可為藉由聚矽氧系、長鏈烷基系、氟系、硫化鉬等剝離處理劑對上述襯墊基材進行表面處理而形成者。 ＜黏著片材＞ 此處所揭示之黏著片材(包含黏著劑層，於具有基材膜之構成中進而包含基材膜，但不含剝離襯墊)之總厚度並無特別限定。黏著片材之總厚度例如可設為大致500 μm以下，自可攜式設備之薄型化之觀點考慮，通常適當的是大致350 μm以下，較佳為大致250 μm以下(例如大致200 μm以下)。此處所揭示之技術可藉由總厚度為大致150 μm以下(更佳為大致100 μm以下、進而更佳為大致未達60 μm、例如大致50 μm以下)之黏著片材(典型而言雙面黏著片材)之形態而較佳地實施。黏著片材之厚度之下限並無特別限定，通常適當的是大致10 μm以上，較佳為大致20 μm以上，更佳為大致30 μm以上。 此處所揭示之黏著片材之黏著力並無特別限定。較佳之一態樣之黏著片材之180度剝離強度為大致17 N/25 mm以上。顯示出此種黏著力之黏著片材對被接著體之密接性高，因此可成為防止油分滲透之性能優異者。更佳為180度剝離強度為大致17.5 N/25 mm以上(更佳為大致18 N/25 mm以上、例如大致18.5 N/25 mm以上)之黏著片材。自對被接著體之密接性越高越良好之觀點考慮，180度剝離強度之上限並無特別限制，通常情況下適當的是大致80 N/25 mm以下(典型而言大致70 N/25 mm以下、例如大致50 N/25 mm以下)。 此處，所謂上述180度剝離強度係指對不鏽鋼板之180度剝離強度(180度剝離黏著力)。180度剝離強度可如下所述般進行測定。具體而言，對於將黏著片材切成寬25 mm、長100 mm之尺寸而成之測定樣品，於23℃、50%RH之環境下，使2 kg之輥往返1次而將上述測定樣品之黏著面壓接於不鏽鋼板(SUS304BA板)之表面上。將其於相同環境下放置30分鐘後，使用萬能拉伸壓縮試驗機，依據JIS Z0237：2000，於拉伸速度為300 mm/分鐘、剝離角度為180度之條件下測定剝離強度(N/25 mm)。作為萬能拉伸壓縮試驗機，例如可使用Minebea公司製造之「拉伸壓縮試驗機、TG-1kN」。於後述之實施例中，亦採用同樣之測定方法。 ＜用途＞ 此處所揭示之黏著片材係保持性能較高，且顯示出良好之耐油性(防油分滲透性)，亦即除了黏著劑層自身之油分吸收以外、自黏著劑層與被接著體之界面之油分滲入亦得到抑制。靈活運用此種特徵，上述黏著片材可於各種可攜式設備(可攜式機器)中較佳地利用於固定構件。例如，適於行動電子設備中之構件之固定用途。上述行動電子機器之非限定性例子中包括：貼附於行動電話、智慧型手機、平板型電腦、筆記型電腦、各種可穿戴設備(例如，如手錶般佩戴於手腕上之腕戴型，藉由夾具或條帶等佩戴於身體之一部分之模組型，包含眼鏡型(單眼型或雙眼型。亦包含頭盔型)之護目鏡型，以例如附件之形態安裝於襯衫或襪子、帽子等上之衣服型，如耳機般安裝於耳朵上之耳套型等)、數位相機、數位攝錄影機、聲頻設備(可攜式音樂播放器、IC記錄器等)、計算機(計算器等)、可攜式遊戲機、電子辭典、電子記事簿、電子書、車輛用資訊設備、可攜式收音機、可攜式電視機、可攜式印表機、可攜式掃描器、可攜式數據機等。行動電子設備以外之可攜式設備之非限定性例中包括：機械式手錶或懷錶、手電筒、手鏡、皮夾等。再者，於本說明書中，所謂「攜帶」，若僅可單純地攜帶則並不充分，而是指具有個人(標準的成人)可相對容易地搬運之水準的攜帶性。 此處所揭示之黏著片材(典型而言雙面黏著片材)可藉由經加工成各種外形之接合材之形態而利用於構成可攜式設備之構件之固定。作為較佳之用途，可列舉固定構成行動電子設備之構件之用途。其中，可較佳地用於具有液晶顯示裝置之行動電子設備。例如，適合於此種行動電子設備中將顯示部(可為液晶顯示裝置之顯示部)或顯示部保護構件與殼體接合之用途等。 作為此種接合材之較佳形態，可列舉具有寬4.0 mm以下(例如2.0 mm以下、典型而言未達2.0 mm)之窄幅部之形態。此處所揭示之黏著片材除了耐油性以外凝集力亦優異，因此即便以包含此種窄幅部之形狀(例如框狀)之接合材之形式使用，亦可良好地固定構件。於一態樣中，上述窄幅部之寬度可為1.5 mm以下，亦可為1.0 mm以下，亦可為0.5 mm左右或其以下。窄幅部之寬度之下限並無特別限制，自黏著片材之操作性之觀點考慮，通常適當的是0.1 mm以上(典型而言0.2 mm以上)。 上述窄幅部典型而言為線狀。此處所謂線狀係除了直線狀、曲線狀、摺線狀(例如L字型)等以外，亦包含框狀或圓狀等環狀、或該等之複合或中間形狀之概念。上述所謂環狀並不限定於由曲線所構成者，其係包含例如沿著四邊形之外周之形狀(框狀)或沿著扇型之外周之形狀般一部分或全部形成為直線狀之環狀之概念。上述窄幅部之長度並無特別限定。例如於上述窄幅部之長度為10 mm以上(典型而言20 mm以上、例如30 mm以上)之形態中，可適宜地發揮應用此處所揭示之技術之效果。 藉由本說明書所揭示之事項中包含以下者。 (1) 一種黏著片材，其係於可攜式設備中用於固定構件者，且 其包含基材膜、及配置於該基材膜之至少一個表面上之黏著劑層， 上述黏著劑層係使用黏著劑組合物而形成，上述黏著劑組合物含有作為基礎聚合物之丙烯酸系聚合物、增黏樹脂、及交聯劑， 構成上述丙烯酸系聚合物之單體成分含有多於大致50重量%之(甲基)丙烯酸C_1-6 烷基酯， 上述增黏樹脂之含量係相對於上述丙烯酸系聚合物100重量份而大致超過10重量份之量(例如大致超過10重量份且55重量份以下)， 上述交聯劑包含環氧系交聯劑與異氰酸酯系交聯劑。 (2) 如上述(1)之黏著片材，其中上述增黏樹脂包含酚系增黏樹脂。 (3) 如上述(2)之黏著片材，其中上述酚系增黏樹脂之含量係相對於上述丙烯酸系聚合物100重量份而大致超過10重量份之量。 (4) 如上述(1)～(3)中任一項之黏著片材，其中上述增黏樹脂包含羥值為大致30 mgKOH/g以上之增黏樹脂。 (5) 如上述(1)～(4)中任一項之黏著片材，其中上述單體成分包含大致0.5重量%～大致10重量%之含羧基單體。 (6) 如上述(1)～(5)中任一項之黏著片材，其中上述環氧系交聯劑之含量係相對於上述丙烯酸系聚合物100重量份而大致未達0.05重量份。 (7) 如上述(1)～(6)中任一項之黏著片材，其中上述環氧系交聯劑之含量係上述異氰酸酯系交聯劑之含量之大致1/100以下。 (8) 如上述(1)～(7)中任一項之黏著片材，其中上述黏著劑層之厚度為大致25 μm以下。 (9) 如上述(1)～(8)中任一項之黏著片材，其中180度剝離強度為大致17 N/25 mm以上。 (10) 如上述(1)～(9)中任一項之黏著片材，其係以為於上述基材膜之一個表面及另一表面上具有上述黏著劑層之雙面黏著片材之形式構成。 (11) 如上述(1)～(10)中任一項之黏著片材，其中上述(甲基)丙烯酸C_1-6 烷基酯之大致80重量%以上(例如大致95重量%以上)為於酯末端具有碳原子數為3～6之直鏈烷基之丙烯酸烷基酯。 (12) 如上述(1)～(11)中任一項之黏著片材，其中上述單體成分包含多於大致50重量%(較佳為80重量%以上)之丙烯酸丁酯。 (13) 如上述(1)～(12)中任一項之黏著片材，其中上述單體成分中，(甲基)丙烯酸C_7-18 烷基酯之含量為0～10重量%左右(例如0～5重量%左右)。 (14) 如上述(1)～(13)中任一項之黏著片材，其中上述黏著劑層包含相對於上述丙烯酸系聚合物100重量份而為大致15重量份以上之萜酚樹脂。 (15) 如上述(1)～(14)中任一項之黏著片材，其中上述黏著劑層包含相對於丙烯酸系聚合物100重量份而為大致15重量份以上之羥值為大致30 mgKOH/g以上(例如大致50 mgKOH/g以上)之增黏樹脂。 (16) 如上述(1)～(15)中任一項之黏著片材，其中上述基材膜係單層結構之PET膜。 (17) 如上述(1)～(16)中任一項之黏著片材，其中上述黏著片材具有窄幅部，該窄幅部之寬度為大致0.2 mm以上且大致未達2.0 mm。 (18) 一種黏著片材，其係於可攜式設備中用於固定構件者，且 其係以雙面黏著片材之形式構成，上述雙面黏著片材包含基材膜、及配置於該基材膜之一個表面及另一表面上之黏著劑層， 上述黏著劑層之厚度為大致10 μm以上且大致25 μm以下，上述雙面黏著片材之總厚為大致30 μm以上且大致未達60 μm， 上述基材膜為PET膜， 上述黏著劑層係使用黏著劑組合物而形成，上述黏著劑組合物包含作為基礎聚合物之丙烯酸系聚合物、作為增黏樹脂之萜酚樹脂、及交聯劑， 構成上述丙烯酸系聚合物之單體成分含有多於80重量%之丙烯酸丁酯，且(甲基)丙烯酸C_7-18 烷基酯之含量為0～5重量%左右， 上述單體成分含有3～8重量%左右之含羧基單體， 上述萜酚樹脂之含量係相對於上述丙烯酸系聚合物100重量份而為15～45重量份左右， 上述交聯劑包含環氧系交聯劑與異氰酸酯系交聯劑， 上述環氧系交聯劑之含量係相對於上述丙烯酸系聚合物100重量份而大致未達0.05重量份， 上述異氰酸酯系交聯劑之含量係相對於上述丙烯酸系聚合物100重量份而大致未達4重量份，且 上述環氧系交聯劑之含量係上述異氰酸酯系交聯劑之含量之大致1/100以下。 (19) 一種可攜式設備，其包含使用上述(1)～(18)中任一項中所記載之黏著片材而進行固定之構件。 (20) 如上述(19)之可攜式設備，其中上述可攜式設備係可穿戴設備(例如腕戴型之可穿戴設備)。 [實施例] 以下，對與本發明有關之若干實施例加以說明，但並非意指將本發明限定於該實施例所示者。再者，於以下之說明中，「份」及「%」只要無特別說明則為重量基準。 ＜黏著劑組合物之製備＞ [例1] 於具有攪拌機、溫度計、氮氣導入管、回流冷凝器及滴液漏斗之反應容器中裝入作為單體成分之BA 95份及AA 5份、作為聚合溶劑之乙酸乙酯233份，一面導入氮氣一面進行2小時攪拌。如上所述般將聚合系內之氧去除後，加入0.2份之2,2'-偶氮二異丁腈作為聚合起始劑，於60℃下進行8小時之溶液聚合而獲得丙烯酸系聚合物之溶液。該丙烯酸系聚合物之Mw為約70×10⁴ 。 於上述丙烯酸系聚合物溶液中，相對於該溶液中所含之丙烯酸系聚合物100份，加入作為增黏樹脂之萜酚樹脂(商品名為「YS POLYSTAR T-115」，軟化點為約115℃，羥值為30～60 mgKOH/g，安原化學公司製造；以下稱為「增黏樹脂A」)20份、作為交聯劑之異氰酸酯系交聯劑(商品名「Coronate L」，三羥甲基丙烷/甲苯二異氰酸酯三聚物加成物之75%乙酸乙酯溶液，日本聚胺酯工業公司製造；以下稱為「異氰酸酯系交聯劑A」)2份及環氧系交聯劑(商品名「TETRAD-C」，1,3-雙(N,N-二縮水甘油基胺基甲基)環己烷，三菱瓦斯化學公司製造；以下稱為「環氧系交聯劑B」)0.01份，進行攪拌混合而製備黏著劑組合物。 [例2～10] 於例1之黏著劑組合物之製備中，如表1、2中所示般設定所使用之增黏樹脂之種類及使用量、以及所使用之交聯劑之種類及使用量。關於其他方面，與例1同樣地進行操作而分別製備例2～10之黏著劑組合物。此處，表1、2中之增黏樹脂B係安原化學公司製造之商品名「YS POLYSTAR S-145」(萜酚樹脂，軟化點為約145℃，羥值為70～110 mgKOH/g)，增黏樹脂C係荒川化學工業公司製造之商品名「TAMANOL 803L」(萜酚樹脂，軟化點為約145～160℃，羥值為1～20 mgKOH/g)。又，表1、2中之「(份)」均表示相對於丙烯酸系聚合物100份之使用量。 [例11、12] 於具有攪拌機、溫度計、氮氣導入管、回流冷凝器及滴液漏斗之反應容器中裝入作為單體成分之丙烯酸-2-乙基己酯(2EHA) 90份及AA 10份、作為聚合溶劑之乙酸乙酯199份，一面導入氮氣一面進行2小時攪拌。如上所述般將系統系內之氧去除後，加入作為聚合起始劑之0.2份之過氧化苯甲醯，於60℃下進行6小時之溶液聚合而獲得丙烯酸系聚合物之溶液。該丙烯酸系聚合物之Mw為約120×10⁴ 。 於上述丙烯酸系聚合物溶液中，相對於該溶液中所含之丙烯酸系聚合物100份，使用表2中所示之種類及量之增黏樹脂及交聯劑，分別製備例11、12之黏著劑組合物。 [例13～15] 於例1之黏著劑組合物之製備中，以表2中所示之量使用異氰酸酯系交聯劑及環氧系交聯劑之僅任意一者。關於其他方面，與例1同樣地進行操作而分別製備例13～15之黏著劑組合物。 ＜黏著片材之製作＞ [例1～15] 作為剝離襯墊，準備2片單面成為經剝離處理之剝離面的聚酯製剝離膜(商品名「DIAFOIL MRF」，厚度為38 μm，三菱聚酯公司製造)。於該等剝離襯墊之剝離面上塗佈各例之黏著劑組合物，於100℃下進行2分鐘乾燥而形成厚度為19 μm之黏著劑層。將形成於上述2片剝離襯墊上之黏著劑層分別貼合於厚度為12 μm之透明基材膜之第1面及第2面，製作總厚為50 μm之雙面黏著片材。上述剝離襯墊係直接殘留於黏著劑層上，用於黏著劑層之表面(接著面)之保護。作為基材膜，使用東麗公司製造之PET膜(樹脂膜)、商品名「Lumirror」。 [例16] 於上述厚度為38 μm之聚酯製剝離膜(商品名「DIAFOIL MRF」，三菱聚酯公司製造)之剝離面上塗佈例4之黏著劑組合物，於100℃下進行2分鐘乾燥，形成厚度為25 μm之黏著劑層。於該黏著劑層上貼合厚度為25 μm之聚酯製剝離膜(商品名「DIAFOIL MRF」，厚度為25 μm，三菱聚酯公司製造)之剝離面。如上所述般獲得兩面經上述2片聚酯製剝離膜保護之厚度為25 μm之無基材之雙面黏著片材。 將所獲得之雙面黏著片材於23℃、50%RH之環境下進行1天熟化後，對該雙面黏著片材進行以下之評價試驗。 ＜評價試驗＞ [180度剝離強度] 於23℃、50%RH之測定環境下，於雙面黏著片材之一個黏著面上貼附厚度為50 μm之聚對苯二甲酸乙二酯(PET)膜進行襯底，切成寬25 mm、長100 mm之尺寸而製作測定樣品。對於該測定樣品之另一黏著面，藉由上述方法測定180度剝離強度(N/25 mm)。 [保持力] 依據JIS Z0237(2004)進行保持力試驗。亦即，於23℃、50%RH之環境下，於雙面黏著片材之一個黏著面上貼附厚度為50 μm之PET膜進行襯底，切成寬10 mm而製作測定樣品。將該測定樣品之另一黏著面以寬10 mm、長20 mm之接著面積貼附於作為被接著體之電木板上。使如上所述般貼附於被接著體上之測定樣品於80℃之環境下垂下而放置30分鐘後，於上述測定樣品之自由端賦予1 kg之負載。對於在賦予有上述負載之狀態下於80℃之環境下放置1小時後之測定樣品，測定距最初之貼附位置之偏移距離(mm)。 [油滲入距離] 於23℃、50%RH之環境下，於雙面黏著片材之一個黏著面上貼附厚度為50 μm之PET膜進行襯底，切成30 mm見方之正方形而製作測定樣品。將該測定樣品之另一黏著面貼附於不鏽鋼板(SUS304BA板)上並放置30分鐘後，自上述測定樣品之背面(上述PET膜之表面)全體至該測定樣品周圍之不鏽鋼板均勻地塗佈油酸，於65℃、95%RH之環境下保持72小時。其後，擦拭油酸，測定油酸自測定樣品之外緣滲入至該測定樣品之內側之距離(油滲入距離)。具體而言，對於構成測定樣品之外緣之4個邊，分別測定於該邊中油酸滲入至最內部之距離，算出該等之平均值。 [抓固性] 將例1～15之雙面黏著片材切成縱100 mm、橫20 mm之尺寸，將一個黏著面貼附於不鏽鋼板上而進行固定。使另一黏著面露出，試驗者以手指朝一個方向輕輕擦拭該黏著面。連續反覆進行該操作30次後，關於黏著劑層自基材膜脫落之程度，將未發現黏著劑層脫落之情形評價為E(Excellent，優秀)，將最初之70面積%以上之黏著劑層殘存之情形評價為G(Good，良好)，將最初之50面積%以上且未達70面積%之黏著劑層殘存之情形評價為A(Acceptable，尚可)，將基材膜上所殘存之黏著劑層未達最初之50面積%之情形評價為P(Poor，差)。 將所獲得之結果與各例之黏著片材之概略構成一併示於表1、2中。   [表1]

[表2]

如表1、2所示，以含有多於50重量%之(甲基)丙烯酸C_1-6 烷基酯的丙烯酸系聚合物作為基礎聚合物、且組合使用環氧系交聯劑與異氰酸酯系交聯劑之例1～8及例16之黏著片材均係油分滲入距離為5mm以下，且顯示出良好之防油分滲透性。又，確認到該等黏著片材均係保持力評價中之偏移為2.5 mm以下，顯示出優異之凝集力(保持特性)。例1～7之黏著片材獲得了特別良好之結果。 相對於此，相對於丙烯酸系聚合物100份而增黏樹脂之使用量為10份以下之例9、10及該丙烯酸系聚合物之主單體為丙烯酸C₈ 烷基酯之例11、12均係油滲入距離較長，防油分滲透性較低。又，單獨使用異氰酸酯系交聯劑之例13、14係保持力較低。單獨使用環氧系交聯劑之例15係油滲入距離較長，抓固性亦較低。 以上，對本發明之具體例進行了詳細說明，但該等僅為例示，並未限定專利申請範圍。於專利申請範圍中所記載之技術中亦包括對以上所例示之具體例進行各種變化、變更者。Hereinafter, suitable embodiments of the present invention will be described. Furthermore, with regard to matters other than those specifically mentioned in this specification and necessary for the implementation of the present invention, it can be obtained based on the instructions on the implementation of the invention described in this specification and the technical common sense at the time of filing the application. Understand. The present invention can be implemented based on the content disclosed in this specification and common technical knowledge in the field. In addition, in the following drawings, members and parts that perform the same function may be described with the same reference numerals, and repeated descriptions will be omitted or simplified. In addition, the embodiments described in the drawings are schematic in order to clearly explain the present invention, and do not necessarily accurately represent the size or reduction ratio of the adhesive sheet of the present invention that is actually provided as a product. In this specification, the so-called "adhesive" refers to a material that has the following properties as described above: it presents a soft solid (viscoelastic) state in a temperature region near room temperature, and is simply adhered by pressure On the body being followed. The so-called adhesive here is as defined in "CA Dahlquist, "Adhesion: Fundamental and Practice", McLaren & Sons, (1966) P. 143". Generally speaking, it has an elastic modulus E ^* ( 1Hz) Materials with properties of <10 ⁷ dyne/cm ² (typically materials with the above properties at 25°C). In this specification, the so-called "(meth)acryloyl group" includes the meaning of an allyl group and a methacryloyl group. Similarly, the so-called "(meth)acrylate" includes acrylate and methacrylate, and the so-called "(meth)acrylate" includes acrylic and methacrylate. The meaning. In this specification, the “acrylic polymer” refers to a monomer unit derived from a monomer having at least one (meth)acrylic acid group in one molecule as the monomer unit constituting the polymer polymer. Hereinafter, a monomer having at least one (meth)acrylic acid group in one molecule is also referred to as an "acrylic monomer". Therefore, the acrylic polymer system in this specification is defined as a polymer containing monomer units derived from acrylic monomers. The adhesive sheet disclosed here is composed of an adhesive layer. A typical aspect of the above-mentioned adhesive sheet is an adhesive sheet with a substrate in the form of an adhesive layer on at least one surface of a substrate film (support). The concept of the so-called adhesive sheet here can include those called adhesive tape, adhesive label, adhesive film, etc. Furthermore, the adhesive sheet disclosed here can be in the form of a roll or a single sheet. Or it may be an adhesive sheet processed into various shapes. In addition, the base film may not be present. The adhesive sheet disclosed here can be, for example, one having the cross-sectional structure schematically shown in FIG. 1. The adhesive sheet 1 includes a base film 10 and a first adhesive layer 21 and a second adhesive layer 22 supported by a first surface 10A and a second surface 10B of the base film 10, respectively. Both the first surface 10A and the second surface 10B are non-peelable surfaces (non-peelable surfaces). The adhesive sheet 1 is used by attaching the surface (first adhesive surface) 21A of the first adhesive layer 21 and the surface (second adhesive surface) 22A of the second adhesive layer 22 to the adherend respectively. That is, the adhesive sheet 1 is formed in the form of a double-sided adhesive sheet (a double-sided adhesive sheet). The pressure-sensitive adhesive sheet 1 before use has a configuration in which the first pressure-sensitive adhesive surface 21A and the second pressure-sensitive adhesive surface 22A are respectively protected by release liners 31 and 32 whose at least the adhesive surface side becomes a release surface (release surface). Or it can also be configured as follows: the release liner 32 is omitted, and the release liner 31 uses both sides as the release surface, and the adhesive sheet 1 is wound so that the second adhesive surface 22A abuts against the back of the release liner 31 Therefore, the second adhesive surface 22A is also protected by the release liner 31. The technology disclosed here can also be implemented in the form of a single-sided adhesive sheet having an adhesive layer on only one surface of the base film. One of the single-sided adhesive sheets is illustrated in FIG. 2. The adhesive sheet 2 includes a base film 10 and a first adhesive layer 21 supported by its first surface 10A. The surface (first adhesive surface) 21A of the first adhesive layer 21 is attached to the adherend And use. The adhesive sheet 2 before use has a structure in which the first adhesive surface 21A is protected by a release liner 31 whose at least the adhesive surface side becomes a release surface. Or it can also be configured as follows: the release liner 31 is omitted, the base film 10 uses the second surface 10B as the release surface, and the adhesive sheet 2 is wound so that the first adhesive surface 21A abuts against the base film The second surface 10B of 10 protects the first adhesive surface 21A. Alternatively, although the adhesive sheet disclosed here is not shown in particular, it may also be a double-sided adhesive sheet without a substrate (that is, without a substrate) containing only an adhesive layer. <Adhesive layer> The adhesive sheet disclosed here has an adhesive layer formed using an adhesive composition, and the adhesive composition includes an acrylic polymer as a base polymer, a tackifying resin, and a crosslinking agent. The adhesive sheet may be, for example, an adhesive sheet with a substrate having the adhesive layer on at least one surface of a substrate film. Here, the so-called base polymer refers to the main component of the rubbery polymer (a polymer showing rubber elasticity in a temperature region around room temperature) contained in the adhesive layer. In addition, in this specification, the "main component" means a component containing more than 50% by weight when there is no special description. (Acrylic polymer) The above-mentioned acrylic polymer contains a C _1-6 alkyl (meth)acrylate as a main monomer, and may further contain a monomer component of a secondary monomer that is copolymerizable with the main monomer的polymers. Here, the so-called main single system refers to the main component of the monomer component, that is, the component that accounts for more than 50% by weight. Specific examples of C _1-6 alkyl (meth)acrylate are not particularly limited, and examples include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, ( Isopropyl meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, amyl (meth)acrylate, isobutyl (meth)acrylate Amyl ester, hexyl (meth)acrylate, etc. These C _1-6 alkyl (meth)acrylates can be used individually by 1 type or in combination of 2 or more types. For acrylic polymers with C _1-6 alkyl (meth)acrylate as the main monomer, and with alkyl (meth)acrylate having a higher alkyl group at the end of the ester Compared with the acrylic polymer as the main monomer, the affinity to oil is generally lower. Therefore, the adhesive layer containing the acrylic polymer as a base polymer tends to be difficult to absorb oil in the adhesive layer. Since the lower layers so that the adhesive lipophilic viewpoint, the acrylic-based monomer is preferably a polymer of (meth) acrylic acid C _1-5 alkyl ester, more preferably (meth) acrylic acid C _{1- 4} alkyl esters. As a preferred aspect of the acrylic polymer, from the viewpoint of improving the adhesion to the adherend or the adhesion to the substrate film in the construction of the substrate film, the main monomer is (methyl) ) C _2-6 alkyl acrylate, more preferably C _4-6 alkyl (meth)acrylate. As another preferred aspect of the acrylic polymer, from the viewpoint of improving the adhesion, the main monomer is C _1-6 alkyl acrylate, more preferably C _1-4 alkyl acrylate (for example, C _{1-4 2-4} alkyl ester). As the above-mentioned (meth)acrylate C _1-6 alkyl ester, from the viewpoint of reducing the lipophilicity of the self-adhesive layer and improving the adhesion to the adherend or the substrate film, a homopolymer glass can be preferably used The transition temperature (Tg) is approximately 20°C or less (typically approximately 10°C or less, preferably approximately 0°C or less, more preferably approximately -10°C or less, and even more preferably approximately -15°C or less) of (methyl ) C _1-6 alkyl acrylate. The technique disclosed here can be implemented preferably by the state where the main monomer of the acrylic polymer is n-butyl acrylate (BA). In addition, from the viewpoint of reducing the lipophilicity of the adhesive layer, among the monomer components constituting the acrylic polymer, (meth)acrylate C _1-6 alkyl ester (typically C _1-6 alkyl acrylate The proportion of esters such as BA) is preferably approximately 60% by weight or more, more preferably approximately 75% by weight or more, and still more preferably approximately 85% by weight or more. The technology disclosed here can be achieved by, for example, approximately 70% by weight or more of the above monomer components (more preferably approximately 80% by weight or more, still more preferably approximately 85% by weight or more, or approximately 90% by weight or more or approximately 95% by weight). % Or more) is the aspect of BA and is preferably implemented. In the acrylic polymer in the technology disclosed here, monomers (other monomers) other than the above may be copolymerized as needed within a range that does not significantly impair the effects of the present invention. The above-mentioned other monomers can be used for purposes such as adjusting the Tg of the acrylic polymer, increasing the cohesive force, and adjusting the initial adhesion. For example, as a monomer that can improve the cohesive force or heat resistance of the adhesive, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, cyano group-containing monomers, vinyl esters, aromatic vinyl compounds, and the like can be cited. As suitable examples among these, vinyl esters can be cited. Specific examples of vinyl esters include vinyl acetate (VAc), vinyl propionate, and vinyl laurate. Among them, VAc is preferred. In addition, as other monomers that introduce functional groups that can become crosslinking points in the acrylic polymer, or can contribute to improving the peel strength, examples include hydroxyl group (OH group)-containing monomers, carboxyl group-containing monomers, and acid anhydride-containing monomers. Monomers, monomers containing amine groups, monomers containing amine groups, monomers containing imine groups, monomers containing epoxy groups, (meth)acrylic groups

Morpholine, vinyl ethers, etc. As a suitable example of the acrylic polymer in the technique disclosed herein, an acrylic polymer copolymerized with a carboxyl group-containing monomer as the above-mentioned other monomer can be cited. This tends to make it easy to obtain an adhesive layer with high cohesive force. The monomer component containing a carboxyl group-containing monomer can also advantageously contribute to the improvement of the adhesion between the adhesive layer and the adherend or substrate film. Examples of carboxyl group-containing monomers include acrylic acid (AA), methacrylic acid (MAA), carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, Crotonic acid, methacrylate, etc. Among them, preferred carboxyl group-containing monomers include AA and MAA. Especially preferred is AA. As another suitable example of the acrylic polymer in the technique disclosed herein, an acrylic polymer copolymerized with a hydroxyl-containing monomer as the above-mentioned other monomer can be cited. The hydroxyl-containing monomer can also be copolymerized with the carboxyl-containing monomer. Examples of hydroxyl-containing monomers include: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and (meth)acrylic acid 2 -Hydroxyalkyl (meth)acrylates such as hydroxybutyl, 4-hydroxybutyl(meth)acrylate, etc.; polypropylene glycol mono(meth)acrylate; N-hydroxyethyl(meth)acrylamide, etc. Among them, preferred hydroxyl-containing monomers include 2-hydroxyethyl acrylate or 4-hydroxybutyl (meth)acrylate, which generally have a hydroxyl group at the end of a linear alkyl group with about 2 to 4 carbon atoms. The (meth) hydroxyalkyl acrylate. In the acrylic polymer in the technology disclosed herein, alkyl (meth)acrylates other than C _1-6 alkyl (meth)acrylate can be copolymerized within a range that does not significantly impair the effects of the present invention As the other monomers mentioned above. Examples of such (meth)acrylates include alicyclic (meth)acrylates having an alicyclic group at the end of the ester, or having 7 or more carbon atoms at the end of the ester (typically 7-20 ) Alkyl (meth)acrylate. Examples of alicyclic (meth)acrylates include: cyclopropyl (meth)acrylate, cyclobutyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate Ester, cycloheptyl (meth)acrylate, cyclooctyl (meth)acrylate, isopropyl (meth)acrylate

Esters, dicyclopentyl (meth)acrylate, etc. Examples of C _7-20 alkyl (meth)acrylate include: heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, (methyl) ) Isooctyl acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, (meth)acrylate Base) myristyl acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, etc. The above-mentioned "other monomers" may be used singly or in combination of two or more kinds. The total content of other monomers can be set to less than 50% by weight (typically about 0.001 to 40% by weight) of all monomer components, and it is generally appropriate to set it to approximately 25% by weight or less (typically About 0.01 to 25% by weight, for example, about 0.1 to 20% by weight). In the case of using a carboxyl group-containing monomer as the above-mentioned other monomers, the amount used is usually approximately 0.1 to 20% by weight (preferably about 0.1 to 15% by weight, typically 0.2 ~12% by weight, for example, about 0.5-10% by weight). If the usage amount of the carboxyl group-containing monomer increases, the cohesive force of the adhesive layer generally tends to increase. By setting the usage amount of the carboxyl group-containing monomer in the above range, and appropriately exerting the compounding effect of the tackifying resin described later, an adhesive layer exhibiting good adhesion to the adherend and the base film can be suitably realized. In one aspect, the content of the carboxyl group-containing monomer can be set to approximately 1 to 8% by weight (for example, approximately 2 to 7% by weight) of all monomer components. In addition, when a hydroxyl-containing monomer is used as the above-mentioned other monomers, its content is usually approximately 0.001 to 10% by weight (for example, approximately 0.01 to 5% by weight, typically approximately 0.02%) of all monomer components. ~2% by weight). The copolymer composition of the acrylic polymer is suitably designed so that the Tg of the polymer becomes approximately -15°C or less (typically approximately -70°C or more and -15°C or less). Here, the Tg of the acrylic polymer refers to the Tg obtained by the Fox formula based on the composition of the monomer components used to synthesize the polymer. The so-called Fox formula is the relationship between the Tg of the copolymer and the glass transition temperature Tgi of the homopolymer formed by homopolymerizing the monomers constituting the copolymer as shown below. 1/Tg=Σ(Wi/Tgi) Furthermore, in the above Fox formula, Tg represents the glass transition temperature of the copolymer (unit: K), and Wi represents the weight fraction of monomer i in the copolymer (weight basis The copolymerization ratio), Tgi represents the glass transition temperature of the homopolymer of monomer i (unit: K). As the glass transition temperature of the homopolymer for calculating Tg, the value described in a known document is used. For example, regarding the monomers listed below, the following values are used as the glass transition temperature of the homopolymer of the monomer. 2-Ethylhexyl acrylate-70℃ n-butyl acrylate-55℃ ethyl acrylate-22℃ methyl acrylate 8℃ methyl methacrylate 105℃ 2-hydroxyethyl acrylate-15℃ 4-hydroxybutyl acrylate -40°C Vinyl Acetate 32°C Styrene 100°C Acrylic Acid 106°C Methacrylic Acid 228°C For the glass transition temperature of homopolymers of monomers other than those exemplified above, use the "Polymer Handbook" (Part 3) Edition, the value recorded by John Wiley & Sons, Inc. (John Wiley & Sons, Inc, 1989). For monomers with multiple values recorded in this document, the highest value is used. Regarding the monomer whose glass transition temperature of the homopolymer is not described in the above-mentioned literature, the value obtained by the following measurement method is used. Specifically, 100 parts by weight of monomers, 0.2 parts by weight of 2,2'-azobisisobutyronitrile, and ethyl acetate as a polymerization solvent were put into a reactor equipped with a thermometer, a stirrer, a nitrogen introduction tube, and a reflux condenser. 200 parts by weight, stirring was performed for 1 hour while circulating nitrogen gas. After removing the oxygen in the polymerization system in this way, the temperature was raised to 63°C and the reaction was carried out for 10 hours. Next, it was cooled to room temperature to obtain a homopolymer solution with a solid content concentration of 33% by weight. Next, the homopolymer solution was cast-coated on a release liner and dried to prepare a test sample (sheet-like homopolymer) with a thickness of about 2 mm. The test sample was punched into a disc shape with a diameter of 7.9 mm, clamped by parallel plates, and a viscoelasticity testing machine (manufactured by TA Instruments Japan, machine type name "ARES") was used to apply a shear strain with a frequency of 1 Hz. , While measuring the viscoelasticity in the shear mode at a temperature range of -70～150℃ at a heating rate of 5℃/min, the peak top temperature of tanδ (loss tangent) is taken as the Tg of the homopolymer. Although not particularly limited, from the viewpoint of adhesion to the adherend or substrate film, it is advantageous that the Tg of the acrylic polymer is approximately -25°C or less, preferably approximately -35°C or less, more preferably It is roughly below -40°C. Moreover, from the viewpoint of the cohesive force of the adhesive layer, it is advantageous that the Tg of the acrylic polymer is approximately -65°C or higher, preferably approximately -60°C or higher, and more preferably approximately -55°C or higher. The technology disclosed herein can be preferably implemented by the aspect that the Tg of the acrylic polymer is approximately -65°C or higher and -35°C or lower (for example, approximately -55°C or higher and -40°C or lower). The Tg of the acrylic polymer can be adjusted by appropriately changing the monomer composition (that is, the type or usage ratio of the monomer used to synthesize the polymer). The method of obtaining the acrylic polymer is not particularly limited, and various polymerization methods known as acrylic polymer synthesis methods, such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, and photopolymerization, can be suitably used. For example, a solution polymerization method can be preferably used. As a method of supplying monomers when performing solution polymerization, a one-time charging method of supplying all the monomer raw materials at once, a continuous supply (dropping) method, a divided supply (dropping) method, etc. can be suitably adopted. The polymerization temperature can be appropriately selected according to the types of monomers and solvents used, the types of polymerization initiators, and the like. For example, it can be set at about 20°C to 170°C (typically about 40°C to 140°C). In a preferred aspect, the polymerization temperature can be set to approximately 75°C or lower (more preferably approximately 65°C or lower, for example approximately 45°C to 65°C or so). The solvent (polymerization solvent) used in the solution polymerization can be appropriately selected from previously known organic solvents. For example, any one solvent or a mixed solvent of two or more selected from the following solvents can be used: aromatic compounds such as toluene (typically aromatic hydrocarbons); acetates such as ethyl acetate; hexane or cyclic Aliphatic or alicyclic hydrocarbons such as hexane; halogenated alkanes such as 1,2-dichloroethane; lower alcohols such as isopropanol (for example, monohydric alcohols with 1 to 4 carbon atoms); tertiary butyl methyl Ethers such as base ethers; ketones such as methyl ethyl ketone, etc. The initiator used in the polymerization can be appropriately selected from previously known polymerization initiators according to the type of polymerization method. For example, one kind or two or more kinds of azo polymerization initiators such as 2,2'-azobisisobutyronitrile (AIBN) can be preferably used. Other examples of polymerization initiators include persulfates such as potassium persulfate; peroxide-based initiators such as benzyl peroxide and hydrogen peroxide; and substituted ethyl ethane such as phenyl substituted ethane. Alkane-based initiators; aromatic carbonyl compounds, etc. As yet another example of the polymerization initiator, a redox initiator using a combination of a peroxide and a reducing agent can be cited. Such a polymerization initiator can be used individually by 1 type or in combination of 2 or more types. The usage amount of the polymerization initiator may be the usual usage amount. For example, it can be about 0.005 to 1 part by weight (typically about 0.01 to 1 part by weight) relative to 100 parts by weight of all monomer components. Choose within the range. According to the above-mentioned solution polymerization, a polymerization reaction solution in which the acrylic polymer is dissolved in an organic solvent can be obtained. The adhesive layer in the technology disclosed herein may be formed of an adhesive composition that includes the above-mentioned polymerization reaction liquid or an acrylic polymer solution obtained by performing appropriate post-treatment on the reaction liquid. As the above-mentioned acrylic polymer solution, one prepared by preparing the above-mentioned polymerization reaction solution to an appropriate viscosity (concentration) as necessary can be used. Alternatively, it is also possible to use a polymerization method other than solution polymerization (e.g. emulsion polymerization, photopolymerization, bulk polymerization, etc.) to synthesize an acrylic polymer and dissolve the acrylic polymer in an organic solvent. Solution. The weight average molecular weight (Mw) of the base polymer (appropriately acrylic polymer) in the technology disclosed herein is not particularly limited, and may be, for example, approximately 10×10 ⁴ to 500×10 ^{4 in} the range. From the viewpoint of self-adhesive performance, it is preferable that the Mw of the base polymer is approximately 30×10 ⁴ ～200×10 ⁴ (more preferably approximately 45×10 ⁴ ～150×10 ⁴ , typically approximately 65×10 ⁴ ～ 130×10 ⁴ ). Here, Mw means a value obtained by GPC (gel permeation chromatography) in terms of standard polystyrene conversion. As the GPC device, for example, the machine type name "HLC-8320GPC" (column: TSKgelGMH-H(S), manufactured by Tosoh Corporation) can be used. (Crosslinking agent) The said crosslinking agent contains an epoxy type crosslinking agent and an isocyanate type crosslinking agent. By using these two crosslinking agents in combination, the cohesive force of the adhesive layer can be sufficiently improved. In addition, in the structure including the base film (supporting base), good adhesion to the base film can be ensured. The adhesive layer in the technology disclosed herein may contain the above-mentioned crosslinking agent in the form after the cross-linking reaction, the form before the cross-linking reaction, the form partially subjected to the cross-linking reaction, and the intermediate or composite forms of these. The above-mentioned crosslinking agent is typically mainly contained in the adhesive layer in the form after the crosslinking reaction. As an epoxy-based crosslinking agent, a compound having two or more epoxy groups in one molecule can be used without particular limitation. It is preferably an epoxy-based crosslinking agent having 3 to 5 epoxy groups in one molecule. The epoxy crosslinking agent can be used individually by 1 type or in combination of 2 or more types. Although not particularly limited, specific examples of epoxy-based crosslinking agents include, for example, N,N,N',N'-tetraglycidyl-m-xylene diamine, 1,3-bis(N , N-diglycidylaminomethyl) cyclohexane, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, polyglycerol polyglycidyl ether, etc. Commercial products of epoxy-based crosslinking agents include: "TETRAD-C" and "TETRAD-X" manufactured by Mitsubishi Gas Chemical Company, and "Epiclon CR-5L" manufactured by DIC, The brand name "DENACOL EX-512" manufactured by Nagase Chemical Co., Ltd., and the brand name "TEPIC-G" manufactured by Nissan Chemical Industry Co., Ltd., etc. The amount of epoxy crosslinking agent used is not particularly limited. The use amount of the epoxy-based crosslinking agent can be, for example, more than 0 parts by weight and approximately 1 part by weight or less (typically approximately 0.001 to 0.5 parts by weight) based on 100 parts by weight of the acrylic polymer. From the viewpoint of suitably exerting the effect of improving the cohesive force, the amount of epoxy-based crosslinking agent used is usually approximately 0.002 parts by weight or more relative to 100 parts by weight of the acrylic polymer, preferably approximately It is 0.005 parts by weight or more, more preferably approximately 0.008 parts by weight or more. In addition, from the viewpoint of avoiding excessive degradation of the adhesion to the adherend or the base film, the amount of epoxy crosslinking agent used is usually approximately 0.2 per 100 parts by weight of the acrylic polymer. Parts by weight or less, preferably about 0.1 parts by weight or less, more preferably less than 0.05 parts by weight, and still more preferably less than 0.03 parts by weight (for example, about 0.025 parts by weight or less). As the isocyanate-based crosslinking agent, a polyfunctional isocyanate (a compound having an average of two or more isocyanate groups per molecule, including those having an isocyanurate structure) can be preferably used. An isocyanate-based crosslinking agent can be used individually by 1 type or in combination of 2 or more types. Examples of polyfunctional isocyanates include aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, and the like. Specific examples of aliphatic polyisocyanates include: 1,2-ethylene diisocyanate; 1,2-tetramethylene diisocyanate, 1,3-tetramethylene diisocyanate, 1,4-tetramethylene diisocyanate Tetramethylene diisocyanate such as methylene diisocyanate; 1,2-hexamethylene diisocyanate, 1,3-hexamethylene diisocyanate, 1,4-hexamethylene diisocyanate, 1,5- Hexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,5-hexamethylene diisocyanate and other hexamethylene diisocyanates; 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, lysine diisocyanate, etc. Specific examples of alicyclic polyisocyanates include: isophorone diisocyanate; cyclohexyl groups such as 1,2-cyclohexyl diisocyanate, 1,3-cyclohexyl diisocyanate, and 1,4-cyclohexyl diisocyanate Diisocyanate; 1,2-cyclopentyl diisocyanate, 1,3-cyclopentyl diisocyanate and other cyclopentyl diisocyanates; hydrogenated xylylene diisocyanate, hydrogenated toluene diisocyanate, hydrogenated diphenylmethane diisocyanate, Hydrogenated tetramethylxylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, etc. Specific examples of aromatic polyisocyanates include: 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane Diisocyanate, 2,2'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenyl Propane-4,4'-diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, isophenylene diisocyanate, p-benzene Diisocyanate, naphthalene-1,4-diisocyanate, naphthalene-1,5-diisocyanate, 3,3'-dimethoxydiphenyl-4,4'-diisocyanate, xylylene-1,4 -Diisocyanate, xylylene-1,3-diisocyanate, etc. As a preferable polyfunctional isocyanate, the polyfunctional isocyanate which has an average of 3 or more isocyanate groups per molecule can be illustrated. The trifunctional isocyanate can be a polymer (typically a dimer or trimer) or a derivative (such as the addition of a polyol and more than 2 molecules of a polyfunctional isocyanate) of a bifunctional or a trifunctional isocyanate Reaction products), polymers, etc. For example, the dimer or trimer of diphenylmethane diisocyanate, the isocyanurate body of hexamethylene diisocyanate (trimer adduct of isocyanurate structure), trimethylol The reaction product of trimethylolpropane and toluene diisocyanate, the reaction product of trimethylolpropane and hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, polyether polyisocyanate, polyester polyisocyanate and other multifunctional isocyanates. Commercial products of this polyfunctional isocyanate include: "Duranate TPA-100" manufactured by Asahi Kasei Chemical Co., Ltd., "Coronate L" manufactured by Japan Polyurethane Industry Co., Ltd., and "Coronate" manufactured by Japan Polyurethane Industrial Co. "HL", "Coronate HK" manufactured by Japan Polyurethane Industry Co., Ltd., "Coronate HX" manufactured by Japan Polyurethane Industrial Co., Ltd., and "Coronate 2096" manufactured by Japan Polyurethane Industrial Co., Ltd., etc. The usage amount of the isocyanate-based crosslinking agent is not particularly limited. The amount of the isocyanate-based crosslinking agent used can be, for example, more than 0 parts by weight and approximately 10 parts by weight or less (typically approximately 0.01 parts by weight or more and 10 parts by weight or less) relative to 100 parts by weight of the acrylic polymer. Normally, the amount of isocyanate-based crosslinking agent used is approximately 0.1 parts by weight or more and 8 parts by weight or less, preferably approximately 0.3 parts by weight or more and 5 parts by weight relative to 100 parts by weight of the acrylic polymer. , More preferably about 0.5 parts by weight or more and less than 4 parts by weight (for example, about 0.7 parts by weight or more and 3.5 parts by weight or less). By using this amount of isocyanate-based crosslinking agent and epoxy-based crosslinking agent in combination, a high level of adhesion and cohesive force to the adherend and the base film can be achieved. As a result, it is possible to realize an adhesive sheet that exhibits good oil penetration resistance (oil resistance) and excellent retention performance (cohesive force of the adhesive layer). In the technology disclosed here, the relationship between the content of the epoxy-based crosslinking agent and the content of the isocyanate-based crosslinking agent is not particularly limited. The content of the epoxy-based crosslinking agent can be set to approximately 1/50 or less of the content of the isocyanate-based crosslinking agent, for example. From the viewpoint of having the adhesion and cohesive force to the adherend and the base film more suitably, the content of the epoxy-based crosslinking agent is appropriately set to approximately 1/75 or less of the content of the isocyanate-based crosslinking agent It is preferably set to approximately 1/100 or less (for example, 1/150 or less). In addition, from the viewpoint of appropriately exerting the effect of the combined use of an epoxy-based crosslinking agent and an isocyanate-based crosslinking agent, the content of the epoxy-based crosslinking agent is usually set to be an isocyanate-based crosslinking agent. The content of the coupling agent is approximately 1/1000 or more, for example approximately 1/500 or more. The adhesive composition in the technology disclosed herein may also contain other crosslinking agents as needed in addition to the epoxy-based crosslinking agent and the isocyanate-based crosslinking agent, within the limit that does not significantly impair the effect of the present invention. As an example of such other crosslinking agents,

Oxazoline type crosslinking agent, carbodiimide type crosslinking agent, hydrazine type crosslinking agent, aziridine type crosslinking agent, metal chelate type crosslinking agent, etc. Or it may be an adhesive composition that does not contain the above-mentioned other crosslinking agent. (Tackifying resin) As the above-mentioned tackifying resin, a group selected from phenol-based tackifying resins, terpene-based tackifying resins, modified terpene-based tackifying resins, rosin-based tackifying resins, hydrocarbon-based tackifying resins, and epoxy-based tackifying resins can be used. One or more of various known tackifying resins such as tackifying resin, polyamide tackifying resin, elastic system tackifying resin, and ketone tackifying resin. Examples of phenolic tackifying resins include terpene phenol resin, hydrogenated terpene phenol resin, alkyl phenol resin, and rosin phenol resin. The so-called terpene phenol resin refers to polymers containing terpene residues and phenol residues, which are copolymers containing terpenoids and phenolic compounds (terpene-phenol copolymer resins), and homopolymers or copolymers of terpenoids are phenolic The concept of both modified ones (phenol modified terpene resin). Suitable examples of terpenes constituting such a terpene phenol resin include monoterpenes such as α-pinene, β-pinene, and limonene (including d-form, l-form, and d/l-form (dipentene)). The so-called hydrogenated terpene phenol resin refers to a hydrogenated terpene phenol resin having a structure obtained by hydrogenating the terpene phenol resin. Sometimes called hydrogenated terpene phenol resin. Alkylphenol resin is a resin (oil-based phenol resin) obtained from alkylphenol and formaldehyde. As an example of an alkylphenol resin, a novolak type and a resol type are mentioned. Rosin-phenol resins are typically rosins or phenol-modified products of the various rosin derivatives described above (including rosin esters, unsaturated fatty acid-modified rosin esters, and unsaturated fatty acid-modified rosin esters). Examples of the rosin phenol resin include a rosin phenol resin obtained by a method of adding phenol to rosin or the above-mentioned various rosin derivatives through an acid catalyst and performing thermal polymerization. Examples of terpene-based tackifying resins include polymers of terpenoids (typically monoterpenes) such as α-pinene, β-pinene, d-limonene, l-limonene, and dipentene. It can be a homopolymer of one kind of terpenes or a copolymer of two or more terpenes. As one kind of terpenoid homopolymer, α-pinene polymer, β-pinene polymer, dipentene polymer, etc. may be mentioned. Examples of modified terpene resins include those obtained by modifying the above-mentioned terpene resins. Specifically, styrene-modified terpene resin, hydrogenated terpene resin, etc. can be exemplified. The concept of rosin-based tackifying resins here includes both rosin and rosin derivative resins. Examples of rosins include: unmodified rosin (raw rosin) such as rosin gum, wood rosin, and high-oil rosin; modified rosin obtained by modifying such unmodified rosin by hydrogenation, disproportionation, polymerization, etc. (Hydrogenated rosin, disproportionated rosin, polymerized rosin, other chemically modified rosin, etc.). Rosin derivative resins are typically rosin derivatives as described above. The concept of rosin-based resins here includes derivatives of unmodified rosin and derivatives of modified rosin (including hydrogenated rosin, disproportionated rosin, and polymerized rosin). Examples include rosin esters such as unmodified rosin esters as esters of unmodified rosin and alcohols, or rosin esters such as modified rosin esters as esters of modified rosin and alcohols; for example, the use of unsaturated fatty acids on rosin Rosin modified by unsaturated fatty acid; for example, rosin ester modified by unsaturated fatty acid; for example, rosin or the various rosin derivatives (including rosin) Esters, unsaturated fatty acid-modified rosin and unsaturated fatty acid-modified rosin esters) are rosin alcohols obtained by reducing the carboxyl group; for example, rosin or metal salts of various rosin derivatives mentioned above. Specific examples of rosin esters include methyl esters, triethylene glycol esters, glycerides, and pentaerythritol esters of unmodified rosin or modified rosin (hydrogenated rosin, disproportionated rosin, polymerized rosin, etc.). Examples of hydrocarbon-based tackifying resins include: aliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aliphatic-aromatic petroleum resins (styrene-olefin copolymers, etc.), Various hydrocarbon resins such as aliphatic-alicyclic petroleum resins, hydrogenated hydrocarbon resins, lavender-based resins, and lavender-indene resins. The softening point of the tackifying resin is not particularly limited. From the viewpoint of increasing self-cohesive power, in one aspect, a tackifying resin having a softening point (softening temperature) of approximately 80°C or higher (preferably approximately 100°C or higher) can be preferably used. The technology disclosed here can be used in a state where the tackifying resin having the above-mentioned softening point can exceed 50% by weight (more preferably, more than 70% by weight, for example, more than 90% by weight) of the total tackifying resin contained in the adhesive layer. So it is better implemented. For example, a phenolic tackifying resin (terpene phenol resin, etc.) having such a softening point can be preferably used. In a preferred aspect, a terpene phenol resin having a softening point of approximately 135°C or higher (and further approximately 140°C or higher) can be used. The upper limit of the softening point of the tackifying resin is not particularly limited. From the viewpoint of adhesion to the adherend or the base film, in one aspect, it is preferable to use a tackifying resin having a softening point of approximately 200°C or less (more preferably approximately 180°C or less). Furthermore, the softening point of the tackifying resin can be measured in accordance with the softening point test method (Ring and Ball method) specified in JIS K2207. The content of the above-mentioned tackifying resin is preferably set to an amount exceeding 10 parts by weight with respect to 100 parts by weight of the acrylic polymer. Thereby, it is possible to realize an adhesive sheet that suitably exerts the effect of improving the adhesion to the adherend and exhibits good oil penetration resistance. From the viewpoint of obtaining higher adhesion, the content of the tackifying resin relative to 100 parts by weight of the acrylic polymer is preferably approximately 15 parts by weight or more, more preferably approximately 18 parts by weight or more (for example, approximately 20 parts by weight or more) . The technique disclosed here can also be preferably implemented by the aspect that the content of the tackifying resin relative to 100 parts by weight of the acrylic polymer is approximately 25 parts by weight or more. The upper limit of the content of the tackifying resin is not particularly limited. From the viewpoint of compatibility with the base polymer (acrylic polymer) or initial adhesion, in one aspect, it is usually appropriate to set the content of the tackifying resin relative to 100 parts by weight of the acrylic polymer It is approximately 70 parts by weight or less, preferably approximately 55 parts by weight or less, and more preferably approximately 45 parts by weight or less (for example, approximately 40 parts by weight or less). As a preferable aspect, the aspect in which the above-mentioned tackifying resin contains 1 or 2 or more types of phenolic tackifying resin (typically terpene phenol resin) is mentioned. By using phenolic tackifying resin, the adhesion of the adhesive layer to the adherend can be improved, and the oil penetration from the interface with the adherend can be effectively suppressed. In addition, phenol tackifying resins tend to have a lower affinity for oil than rosin-based tackifying resins, for example. Therefore, containing phenolic tackifying resin can also play a role in inhibiting the penetration of oil into the adhesive layer (oil absorption). The technique disclosed herein can be implemented preferably by the fact that approximately 25% by weight or more (more preferably approximately 30% by weight or more) of the total tackifying resin is a terpene phenol resin. It may be that approximately 50% by weight or more of the total tackifying resin is terpene phenol resin, or approximately 80% by weight or more (for example, approximately 90% by weight or more). It may be that substantially all of the tackifying resin (for example, approximately 95 to 100% by weight, and then approximately 99 to 100% by weight) may be terpene phenol resin. The content of the phenolic tackifying resin (for example, terpene phenol resin) is appropriately within the range of approximately 5 to 55 parts by weight (for example, approximately more than 10 parts by weight and 55 parts by weight or less) relative to 100 parts by weight of the acrylic polymer, It is preferably in the range of approximately 15 to 45 parts by weight (for example, approximately 20 to 40 parts by weight). Although not particularly limited, as the tackifying resin in the technology disclosed herein, one having a hydroxyl value higher than 20 mgKOH/g can be used, and a tackifying resin having a hydroxyl value of 30 mgKOH/g or more can be preferably used. Hereinafter, a tackifying resin with a hydroxyl value of 30 mgKOH/g or more is sometimes referred to as "high hydroxyl value resin". According to the tackifying resin containing such a high hydroxyl value resin, an adhesive layer with excellent adhesion to the adherend and high cohesive force can be realized. The use of high hydroxyl value resins can also play a role in reducing the lipophilicity of the adhesive layer. In a preferred aspect, the above-mentioned tackifying resin may also contain a high hydroxyl value resin with a hydroxyl value of 50 mgKOH/g or more (more preferably 70 mgKOH/g or more). Here, as the value of the above-mentioned hydroxyl value, a value measured by the potentiometric titration method specified in JIS K0070: 1992 can be used. The specific measurement method is shown below. [Method for determination of hydroxyl value] 1. Reagent (1) As an acetylation reagent, use the following reagent: Take about 12.5 g (about 11.8 mL) of acetic anhydride, add pyridine to it to make the total amount 50 mL, and proceed It is fully stirred. Or use the following reagent: Take about 25 g (about 23.5 mL) of acetic anhydride, add pyridine to it to make the total amount 100 mL, and stir it thoroughly. (2) As the measuring reagent, use 0.5 mol/L potassium hydroxide ethanol solution. (3) In addition, toluene, pyridine, ethanol and distilled water are prepared. 2. Operation (1) Accurately weigh about 2 g sample in a flat-bottomed flask, add 5 mL of acetylation reagent and 10 mL of pyridine, and install an air condenser. (2) The above flask was heated in a bath of 100°C for 70 minutes and then left to cool. After adding 35 mL of toluene as a solvent from the upper part of the condenser and stirring, 1 mL of distilled water was added and stirred to decompose the acetic anhydride. In order to complete the decomposition, it is heated again in the bath for 10 minutes and left to cool. (3) Wash the condenser tube with 5 mL of ethanol and take it out. Next, 50 mL of pyridine was added as a solvent and stirred. (4) Use a full pipette to add 25 mL of 0.5 mol/L potassium hydroxide ethanol solution. (5) Conduct potentiometric titration with 0.5 mol/L potassium hydroxide ethanol solution. Take the inflection point of the obtained titration curve as the end point. (6) The blank test is to perform the above (1) to (5) without placing a sample. 3. Calculation The hydroxyl value is calculated by the following formula. Hydroxyl value (mgKOH/g)=[(B－C)×f×28.05]/S+D where B: the amount of 0.5 mol/L potassium hydroxide ethanol solution used in the blank test (mL), C: sample The amount of 0.5 mol/L potassium hydroxide ethanol solution used (mL), f: the factor of 0.5 mol/L potassium hydroxide ethanol solution, S: the weight of the sample (g), D: acid value, 28.05: hydrogen The molecular weight of potassium oxide is 1/2 of 56.11. As the high hydroxyl value resin, those having a hydroxyl value above a specific value among the various tackifying resins described above can be used. The high hydroxyl value resin can be used individually by 1 type or in combination of 2 or more types. For example, as a high hydroxyl value resin, a phenolic tackifying resin having a hydroxyl value of 30 mgKOH/g or more can be preferably used. In a preferred aspect, as the tackifying resin, at least a terpene phenol resin with a hydroxyl value of 30 mgKOH/g or more is used. The terpene phenol resin can control the hydroxyl value arbitrarily by the copolymerization ratio of phenol, so it is preferable. The upper limit of the hydroxyl value of the high hydroxyl value resin is not particularly limited. From the viewpoint of compatibility with the base polymer, the hydroxyl value of the high hydroxyl value resin is generally approximately 200 mgKOH/g or less, preferably approximately 180 mgKOH/g or less, and more preferably approximately 160 mgKOH/g or less , And more preferably approximately 140 mgKOH/g or less. The technology disclosed herein can be preferably implemented by a state in which the tackifying resin includes a high hydroxyl value resin with a hydroxyl value of 30-160 mgKOH/g (for example, a phenol-based tackifying resin, preferably a terpene phenol resin). Although not particularly limited, in the case of using high-hydroxy value resins, the proportion of high-hydroxy value resins (such as terpene phenol resins) in the total tackifying resin contained in the adhesive layer can be set to approximately 25. % By weight or more, preferably about 30% by weight or more, more preferably about 50% by weight or more (for example, about 80% by weight or more, typically about 90% by weight or more). It is also possible that substantially all of the tackifying resin (for example, approximately 95 to 100% by weight, and then approximately 99 to 100% by weight) is a high hydroxyl value resin. As a high hydroxyl value resin, resin R1 with a hydroxyl value of less than 70 mgKOH/g and resin R2 with a hydroxyl value of 70 mgKOH/g or more can also be used in combination. Although it is not particularly limited, the content of the resin R2 can be set to about 0.2 to 5 times the content of the resin R1, and it is generally appropriate to set it to about 0.3 to 3 times. The content of resin R2 can also be set to about 1 to 3 times the content of resin R1. (Other additives) In addition to the above components, the adhesive composition may optionally contain leveling agents, crosslinking aids, plasticizers, softeners, antistatic agents, anti-aging agents, ultraviolet absorbers, and antioxidants. , Light stabilizers and other general additives in the field of adhesive compositions. Regarding such various additives, conventionally known ones can be used, and since the present invention is not particularly characterized, detailed descriptions are omitted. The adhesive layer (layer containing adhesive) disclosed here can be formed by an aqueous adhesive composition, a solvent-based adhesive composition, a hot-melt adhesive composition, and an active energy ray-curable adhesive composition. Adhesive layer. The so-called water-based adhesive composition refers to an adhesive composition in the form of a solvent (aqueous solvent) containing water as a main component of an adhesive (adhesive layer forming component), and typically includes what is called a water-dispersed type Adhesive composition (a composition in which at least a part of the adhesive is dispersed in water), etc. In addition, the solvent-based adhesive composition refers to an adhesive composition in the form of an adhesive in an organic solvent. The technology disclosed herein can be preferably implemented by including an adhesive layer formed of a solvent-based adhesive composition from the viewpoint of adhesive properties and the like. The adhesive layer disclosed here can be formed by a previously known method. For example, the following method can be used: an adhesive composition is applied to a peelable surface (peeling surface) or a non-peelable surface and dried to form an adhesive layer. In an adhesive sheet with a base film composition, for example, a method of directly applying (typically coating) an adhesive composition on the base film and drying to form an adhesive layer (direct law). In addition, it can also be used to apply an adhesive composition to a peelable surface (peeling surface) and dry it, thereby forming an adhesive layer on the surface, and transferring the adhesive layer to the base film The method (transfer method). From the viewpoint of productivity, the transfer method is preferred. As the above-mentioned release surface, the surface of the release liner or the back surface of the release-treated base film can be used. Furthermore, the adhesive layer disclosed here is typically formed continuously, but is not limited to this form. For example, the adhesive layer may be formed in a regular or random pattern such as dots and stripes. The application of the adhesive composition can be performed using a conventionally known coating machine such as a gravure roll coater, a die nozzle coater, and a bar coater. Alternatively, the adhesive composition may be applied by an impregnation or curtain coating method. From the viewpoints of promoting crosslinking reaction and improving manufacturing efficiency, the drying of the adhesive composition is preferably performed under heating. The drying temperature can be set to, for example, about 40 to 150°C, and is usually preferably set to about 60 to 130°C. After drying the adhesive composition, it is also possible to perform aging for the purpose of adjusting the migration of components in the adhesive layer, proceeding the crosslinking reaction, and alleviating the strain that may exist in the substrate film or the adhesive layer. The thickness of the adhesive layer is not particularly limited. From the viewpoint of avoiding excessive thickening of the adhesive sheet, the thickness of the adhesive layer is usually approximately 100 μm or less, preferably approximately 70 μm or less, more preferably approximately 50 μm or less, and even more preferably approximately 30 μm or less . In a preferred aspect, the thickness of the adhesive layer may be approximately 28 μm or less, may also be approximately 25 μm or less (for example, less than 25 μm), and furthermore may be approximately 20 μm or less. In general, if the thickness of the adhesive layer becomes smaller, the adhesion to the adherend is reduced, and there is a tendency for oil to penetrate from the interface with the adherend. Therefore, it is particularly meaningful to apply the technology disclosed here to prevent the oil from penetrating from the interface. It can also be an adhesive sheet with an adhesive layer of this thickness on one or both sides of the base film. The lower limit of the thickness of the adhesive layer is not particularly limited. From the viewpoint of adhesion to the adherend, it is advantageous to set it to approximately 4 μm or more, preferably approximately 6 μm or more, and more preferably approximately 10 μm or more ( For example, approximately 15 μm or more). It can also be an adhesive sheet with an adhesive layer of this thickness on one or both sides of the base film. <Base film> In the adhesive sheet of the aspect including the base film, as the base film, those containing a resin film as the base film can be preferably used. The above-mentioned base film is typically a (non-dependent) member that can maintain its shape independently. The base film in the technology disclosed herein may be substantially composed of such a base film. Or the said base film may also contain the auxiliary layer in addition to the said base film. Examples of the auxiliary layer include an undercoat layer, an antistatic layer, and a colored layer provided on the surface of the base film. The above-mentioned resin film is a film containing a resin material as a main component (the resin film contains more than 50% by weight of components). Examples of resin films include polyolefin resin films such as polyethylene (PE), polypropylene (PP), and ethylene-propylene copolymer; polyethylene terephthalate (PET), polyethylene terephthalate Polyester resin films such as butylene (PBT) and polyethylene naphthalate (PEN); vinyl chloride resin films; vinyl acetate resin films; polyimide resin films; polyamide resins Membrane; fluororesin film; celluphane etc. The resin film may be a rubber-based film such as a natural rubber film and a butyl rubber film. Among them, from the viewpoints of handleability and processability, a polyester film is preferred, and a PET film is particularly preferred. Furthermore, in this specification, the so-called "resin film" is typically a non-porous sheet, which is a concept distinguished from the so-called non-woven fabric or woven fabric (in other words, the concept of excluding non-woven fabric or woven fabric ). In the above resin film (such as PET film), fillers (inorganic fillers, organic fillers, etc.), colorants, dispersants (surfactants, etc.), anti-aging agents, antioxidants, and ultraviolet absorbers can also be prepared as needed , Antistatic agents, lubricants, plasticizers and other additives. The blending ratio of various additives is generally less than 30% by weight (for example, less than 20% by weight, typically less than 10% by weight). The above-mentioned resin film may have a single-layer structure, or may have a two-layer, three-layer, or multi-layer structure. From the viewpoint of shape stability, the resin film preferably has a single-layer structure. In the case of a multilayer structure, it is preferable that at least one layer (preferably all layers) is a layer having a continuous structure of the above-mentioned resin (for example, a polyester resin). The method for producing the resin film is not particularly limited, as long as a previously known method is suitably used. For example, conventionally known general film forming methods such as extrusion molding, inflation molding, T-die casting molding, and calender roll molding can be suitably used. In the adhesive sheet of the aspect including the base film, the thickness of the base film is not particularly limited. From the viewpoint of avoiding excessive thickening of the adhesive sheet, the thickness of the base film can be set to be approximately 200 μm or less, preferably approximately 150 μm or less, and more preferably approximately 100 μm or less, for example. According to the purpose or usage of the adhesive sheet, the thickness of the base film may be approximately 70 μm or less, or approximately 50 μm or less, or approximately 30 μm or less (for example, approximately 25 μm or less). In one aspect, the thickness of the base film may be approximately 20 μm or less, or approximately 15 μm or less, or approximately 10 μm or less (for example, approximately 5 μm or less). By making the thickness of the base film smaller, even if the total thickness of the adhesive sheet is the same, the thickness of the adhesive layer can be made larger. This situation can be advantageous from the viewpoint of improving the adhesion to the substrate. The lower limit of the thickness of the base film is not particularly limited. From the viewpoint of handling (handling) or processability of the self-adhesive sheet, the thickness of the base film is generally approximately 0.5 μm or more (for example, 1 μm or more), preferably approximately 2 μm or more, for example, approximately 4 μm or more. In one aspect, the thickness of the base film may be approximately 6 μm or more, may also be approximately 8 μm or more, or may be approximately 10 μm or more (for example, more than 10 μm). The surface of the substrate film can also be subjected to previously known surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and primer coating. Such surface treatment may be a treatment for improving the adhesion between the base film and the adhesive layer, in other words, the adhesive layer's grip on the base film. <Release Liner> In the technology disclosed here, the release liner can be used in the formation of the adhesive layer, the production of the adhesive sheet, the storage, circulation, and shape processing of the adhesive sheet before use. The release liner is not particularly limited. For example, it can be used for a release liner having a release treatment layer on the surface of a liner substrate such as a resin film or paper, or a release liner containing a fluorine-based polymer (polytetrafluoroethylene, etc.) or poly Release liners of low adhesive materials of olefin resin (polyethylene, polypropylene, etc.). The release treatment layer may be formed by, for example, surface treatment of the liner base material with a release treatment agent such as polysiloxane-based, long-chain alkyl-based, fluorine-based, and molybdenum sulfide. <Adhesive sheet> The total thickness of the adhesive sheet disclosed here (including the adhesive layer, further including the base film in the structure having the base film, but not including the release liner) is not particularly limited. The total thickness of the adhesive sheet can be, for example, approximately 500 μm or less. From the viewpoint of thinning of portable devices, it is usually approximately 350 μm or less, preferably approximately 250 μm or less (for example, approximately 200 μm or less) . The technology disclosed here can be achieved by an adhesive sheet (typically double-sided) with a total thickness of approximately 150 μm or less (more preferably approximately 100 μm or less, and even more preferably approximately less than 60 μm, such as approximately 50 μm or less). The form of the adhesive sheet) is preferably implemented. The lower limit of the thickness of the adhesive sheet is not particularly limited. Generally, it is approximately 10 μm or more, preferably approximately 20 μm or more, and more preferably approximately 30 μm or more. The adhesive force of the adhesive sheet disclosed here is not particularly limited. A preferred aspect of the adhesive sheet has a 180 degree peel strength of approximately 17 N/25 mm or more. The adhesive sheet exhibiting such adhesive force has high adhesion to the adherend, and therefore can be excellent in preventing oil penetration. More preferably, it is an adhesive sheet having a 180-degree peel strength of approximately 17.5 N/25 mm or more (more preferably, approximately 18 N/25 mm or more, for example, approximately 18.5 N/25 mm or more). From the viewpoint that the higher the adhesion to the adherend, the better, the upper limit of the 180-degree peel strength is not particularly limited. Generally, it is appropriate to be approximately 80 N/25 mm or less (typically approximately 70 N/25 mm Or less, for example, approximately 50 N/25 mm or less). Here, the above-mentioned 180-degree peel strength refers to the 180-degree peel strength (180-degree peel adhesion) to a stainless steel plate. The 180-degree peel strength can be measured as described below. Specifically, for a measurement sample obtained by cutting the adhesive sheet into a size of 25 mm in width and 100 mm in length, a 2 kg roller is reciprocated once at 23°C and 50% RH, and the measurement sample The adhesive surface is crimped on the surface of the stainless steel plate (SUS304BA plate). After placing it in the same environment for 30 minutes, use a universal tensile and compression testing machine to measure the peel strength (N/25) at a tensile speed of 300 mm/min and a peel angle of 180 degrees in accordance with JIS Z0237: 2000. mm). As a universal tensile and compression tester, for example, "Tensile Compression Tester, TG-1kN" manufactured by Minebea Corporation can be used. In the examples described later, the same measuring method is also used. <Use> The adhesive sheet disclosed here has high retention performance and exhibits good oil resistance (oil penetration resistance), that is, in addition to the oil absorption of the adhesive layer itself, the adhesive layer and the adherend The oil penetration into the interface is also suppressed. Using this feature flexibly, the above-mentioned adhesive sheet can be preferably used as a fixing member in various portable devices (portable machines). For example, it is suitable for fixed use of components in mobile electronic devices. Non-limiting examples of the aforementioned mobile electronic devices include: affixed to mobile phones, smart phones, tablet computers, notebook computers, various wearable devices (for example, wrist-worn type that is worn on the wrist like a watch, borrowed Modular type that is worn on a part of the body by clamps or straps, including glasses type (monocular or double-eye type. Also includes helmet type) goggles type, such as attachments to shirts, socks, hats, etc. The clothes type on the top, the earmuff type that is installed on the ear like a headset, etc.), digital cameras, digital video recorders, audio equipment (portable music players, IC recorders, etc.), computers (calculators, etc.) , Portable game consoles, electronic dictionaries, electronic notebooks, e-books, vehicle information equipment, portable radios, portable TVs, portable printers, portable scanners, portable data Machine waiting. Non-limiting examples of portable devices other than mobile electronic devices include: mechanical watches or pocket watches, flashlights, hand mirrors, wallets, etc. Furthermore, in this specification, the so-called "carry" is not sufficient if it can only be carried simply, but refers to portability at a level that can be carried relatively easily by an individual (a standard adult). The adhesive sheet disclosed here (typically a double-sided adhesive sheet) can be used to fix the components constituting the portable device by being processed into various shapes of the bonding material. As a preferred use, the use of fixing components constituting mobile electronic devices can be cited. Among them, it can be preferably used in mobile electronic devices with liquid crystal display devices. For example, it is suitable for the purpose of joining the display part (which may be the display part of a liquid crystal display device) or the display part protection member to the housing in such a mobile electronic device. As a preferred form of such a bonding material, a form having a narrow width portion with a width of 4.0 mm or less (for example, 2.0 mm or less, typically less than 2.0 mm) can be cited. The adhesive sheet disclosed here is excellent in cohesive force in addition to oil resistance, so even if it is used in the form of a bonding material including such a narrow-width portion (for example, a frame), the member can be fixed well. In one aspect, the width of the aforementioned narrow portion may be 1.5 mm or less, may also be 1.0 mm or less, or may be about 0.5 mm or less. The lower limit of the width of the narrow part is not particularly limited. From the viewpoint of the handling of the adhesive sheet, it is usually 0.1 mm or more (typically 0.2 mm or more). The narrow part is typically linear. The term “linear” as used herein includes not only straight, curved, or broken lines (for example, L-shaped), etc., it also includes the concept of ring shapes such as frame shapes or circular shapes, or composite or intermediate shapes of these. The above-mentioned ring shape is not limited to those formed by curved lines, and includes, for example, a shape along the outer circumference of a quadrilateral (frame shape) or a shape along the outer circumference of a fan shape in which part or all of the ring is formed in a linear shape. concept. The length of the narrow width portion is not particularly limited. For example, in a form in which the length of the narrow width portion is 10 mm or more (typically 20 mm or more, for example, 30 mm or more), the effect of applying the technology disclosed herein can be suitably exerted. The matters disclosed in this manual include the following. (1) An adhesive sheet, which is used to fix a member in a portable device, and includes a substrate film and an adhesive layer disposed on at least one surface of the substrate film, the adhesive layer It is formed by using an adhesive composition. The adhesive composition contains an acrylic polymer as a base polymer, a tackifying resin, and a crosslinking agent, and the monomer components constituting the acrylic polymer contain more than approximately 50 weights % Of (meth)acrylic acid C _1-6 alkyl ester, the content of the tackifying resin is generally more than 10 parts by weight relative to 100 parts by weight of the acrylic polymer (for example, more than 10 parts by weight and 55 parts by weight Parts or less), the crosslinking agent includes an epoxy-based crosslinking agent and an isocyanate-based crosslinking agent. (2) The adhesive sheet of (1) above, wherein the tackifying resin includes a phenol-based tackifying resin. (3) The adhesive sheet of (2) above, wherein the content of the phenolic tackifying resin is approximately more than 10 parts by weight relative to 100 parts by weight of the acrylic polymer. (4) The adhesive sheet of any one of (1) to (3) above, wherein the tackifying resin includes a tackifying resin having a hydroxyl value of approximately 30 mgKOH/g or more. (5) The adhesive sheet according to any one of (1) to (4) above, wherein the monomer component contains approximately 0.5% to approximately 10% by weight of a carboxyl group-containing monomer. (6) The adhesive sheet of any one of (1) to (5) above, wherein the content of the epoxy-based crosslinking agent is less than 0.05 parts by weight relative to 100 parts by weight of the acrylic polymer. (7) The adhesive sheet of any one of (1) to (6) above, wherein the content of the epoxy-based crosslinking agent is approximately 1/100 or less of the content of the isocyanate-based crosslinking agent. (8) The adhesive sheet according to any one of (1) to (7) above, wherein the thickness of the adhesive layer is approximately 25 μm or less. (9) The adhesive sheet of any one of (1) to (8) above, wherein the 180-degree peel strength is approximately 17 N/25 mm or more. (10) The adhesive sheet of any one of (1) to (9) above, which is in the form of a double-sided adhesive sheet with the adhesive layer on one surface and the other surface of the base film constitute. (11) The adhesive sheet of any one of (1) to (10) above, wherein the C _1-6 alkyl (meth)acrylate is approximately 80% by weight or more (for example, approximately 95% by weight or more) An alkyl acrylate having a linear alkyl group with 3-6 carbon atoms at the end of the ester. (12) The adhesive sheet of any one of (1) to (11) above, wherein the monomer component contains more than approximately 50% by weight (preferably more than 80% by weight) of butyl acrylate. (13) The adhesive sheet according to any one of (1) to (12) above, wherein the content of the C _7-18 alkyl (meth)acrylate in the monomer component is about 0-10% by weight ( For example, about 0 to 5 wt%). (14) The adhesive sheet according to any one of (1) to (13) above, wherein the adhesive layer contains approximately 15 parts by weight or more of terpene phenol resin relative to 100 parts by weight of the acrylic polymer. (15) The adhesive sheet according to any one of (1) to (14) above, wherein the adhesive layer contains approximately 15 parts by weight or more with respect to 100 parts by weight of the acrylic polymer having a hydroxyl value of approximately 30 mgKOH /g or more (for example, approximately 50 mgKOH/g or more) of tackifying resin. (16) The adhesive sheet according to any one of (1) to (15) above, wherein the base film is a single-layered PET film. (17) The adhesive sheet of any one of (1) to (16) above, wherein the adhesive sheet has a narrow width portion, and the width of the narrow width portion is approximately 0.2 mm or more and approximately less than 2.0 mm. (18) An adhesive sheet, which is used to fix components in a portable device, and is constructed in the form of a double-sided adhesive sheet. The double-sided adhesive sheet includes a base film and is arranged on the The adhesive layer on one surface of the base film and the other surface, the thickness of the adhesive layer is approximately 10 μm or more and approximately 25 μm or less, and the total thickness of the double-sided adhesive sheet is approximately 30 μm or more and approximately no thickness. Up to 60 μm, the base film is a PET film, the adhesive layer is formed using an adhesive composition, and the adhesive composition includes an acrylic polymer as a base polymer, a terpene phenol resin as a tackifying resin, And a crosslinking agent, the monomer component constituting the acrylic polymer contains more than 80% by weight of butyl acrylate, and the content of C _7-18 alkyl (meth)acrylate is about 0 to 5% by weight, The monomer component contains about 3 to 8% by weight of a carboxyl group-containing monomer, the content of the terpene phenol resin is about 15 to 45 parts by weight relative to 100 parts by weight of the acrylic polymer, and the crosslinking agent contains epoxy Crosslinking agent and isocyanate crosslinking agent, the content of the epoxy crosslinking agent is less than 0.05 parts by weight relative to 100 parts by weight of the acrylic polymer, and the content of the isocyanate crosslinking agent is relative to the above 100 parts by weight of the acrylic polymer is less than 4 parts by weight, and the content of the epoxy-based crosslinking agent is approximately 1/100 or less of the content of the isocyanate-based crosslinking agent. (19) A portable device that includes a member for fixing using the adhesive sheet described in any one of (1) to (18) above. (20) The portable device of (19) above, wherein the portable device is a wearable device (for example, a wrist-worn wearable device). [Examples] Hereinafter, some examples related to the present invention will be described, but it is not intended to limit the present invention to those shown in the examples. In addition, in the following description, "parts" and "%" are based on weight unless otherwise specified. <Preparation of Adhesive Composition> [Example 1] A reaction vessel equipped with a stirrer, a thermometer, a nitrogen introduction tube, a reflux condenser and a dropping funnel was charged with 95 parts of BA and 5 parts of AA as monomer components as polymerization The solvent was 233 parts of ethyl acetate and stirred for 2 hours while introducing nitrogen. After removing the oxygen in the polymerization system as described above, add 0.2 parts of 2,2'-azobisisobutyronitrile as a polymerization initiator, and perform solution polymerization at 60°C for 8 hours to obtain an acrylic polymer的solution. The Mw of the acrylic polymer is about 70×10 ⁴ . In the above-mentioned acrylic polymer solution, with respect to 100 parts of the acrylic polymer contained in the solution, add terpene phenol resin (trade name "YS POLYSTAR T-115") as a tackifying resin with a softening point of about 115 ℃, the hydroxyl value is 30-60 mgKOH/g, manufactured by Yashara Chemical Co.; hereafter referred to as "tackifier resin A") 20 parts, isocyanate-based crosslinking agent (trade name "Coronate L", trihydroxy 75% ethyl acetate solution of methylpropane/toluene diisocyanate trimer adduct, manufactured by Japan Polyurethane Industry Co., Ltd.; hereafter referred to as "isocyanate-based crosslinking agent A") 2 parts and epoxy-based crosslinking agent (commodity Name "TETRAD-C", 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, manufactured by Mitsubishi Gas Chemical Company; hereafter referred to as "Epoxy crosslinking agent B") 0.01 Parts, stir and mix to prepare an adhesive composition. [Examples 2-10] In the preparation of the adhesive composition of Example 1, set the type and amount of tackifying resin used, and the type and amount of crosslinking agent used as shown in Tables 1 and 2 Usage amount. In other respects, the same operations as in Example 1 were performed to prepare the adhesive compositions of Examples 2 to 10, respectively. Here, the tackifying resin B in Tables 1 and 2 is the trade name "YS POLYSTAR S-145" manufactured by Yashara Chemical Co., Ltd. (terpene phenol resin, softening point is about 145°C, and hydroxyl value is 70-110 mgKOH/g) , Tackifying resin C is the trade name "TAMANOL 803L" manufactured by Arakawa Chemical Industry Co., Ltd. (terpene phenol resin, softening point is about 145-160℃, hydroxyl value is 1-20 mgKOH/g). In addition, the "(parts)" in Tables 1 and 2 all indicate the usage amount relative to 100 parts of acrylic polymer. [Examples 11 and 12] A reaction vessel equipped with a stirrer, a thermometer, a nitrogen introduction tube, a reflux condenser, and a dropping funnel was charged with 90 parts of 2-ethylhexyl acrylate (2EHA) and AA 10 as a monomer component 199 parts of ethyl acetate as a polymerization solvent, and stirring was performed for 2 hours while introducing nitrogen. After removing the oxygen in the system as described above, 0.2 parts of benzoyl peroxide was added as a polymerization initiator, and solution polymerization was performed at 60°C for 6 hours to obtain an acrylic polymer solution. The Mw of the acrylic polymer is about 120×10 ⁴ . In the above-mentioned acrylic polymer solution, with respect to 100 parts of acrylic polymer contained in the solution, the types and amounts of tackifying resin and crosslinking agent shown in Table 2 were used to prepare the examples 11 and 12, respectively. Adhesive composition. [Examples 13-15] In the preparation of the adhesive composition of Example 1, only any one of the isocyanate-based crosslinking agent and the epoxy-based crosslinking agent was used in the amount shown in Table 2. In other respects, the same operation as Example 1 was performed to prepare the adhesive compositions of Examples 13 to 15 respectively. <Preparation of Adhesive Sheet> [Examples 1-15] As a release liner, prepare 2 sheets of polyester release film (trade name "DIAFOIL MRF", thickness 38 μm, Mitsubishi Made by Polyester Company). The adhesive composition of each example was coated on the release surface of the release liners, and dried at 100° C. for 2 minutes to form an adhesive layer with a thickness of 19 μm. The adhesive layers formed on the two release liners were attached to the first and second sides of a transparent base film with a thickness of 12 μm, respectively, to produce a double-sided adhesive sheet with a total thickness of 50 μm. The release liner is directly left on the adhesive layer for protection of the surface (adhesive surface) of the adhesive layer. As the base film, PET film (resin film) manufactured by Toray Co., Ltd., trade name "Lumirror" was used. [Example 16] The adhesive composition of Example 4 was coated on the peeling surface of the polyester release film (trade name "DIAFOIL MRF", manufactured by Mitsubishi Polyester Co., Ltd.) with a thickness of 38 μm, and the process was carried out at 100°C for 2 Dry in minutes to form an adhesive layer with a thickness of 25 μm. The peeling surface of a polyester release film (trade name "DIAFOIL MRF", thickness 25 μm, manufactured by Mitsubishi Polyester Co., Ltd.) with a thickness of 25 μm (trade name "DIAFOIL MRF", thickness of 25 μm, manufactured by Mitsubishi Polyester Co., Ltd.) was stuck on the adhesive layer. As described above, a substrate-free double-sided adhesive sheet with a thickness of 25 μm protected by the two polyester release films on both sides was obtained. After curing the obtained double-sided adhesive sheet in an environment of 23° C. and 50% RH for one day, the following evaluation test was performed on the double-sided adhesive sheet. ＜Evaluation test＞ [180 degree peeling strength] Under 23℃, 50%RH measurement environment, a polyethylene terephthalate (PET) with a thickness of 50 μm is attached to one adhesive surface of the double-sided adhesive sheet ) The film is the substrate and cut into a size of 25 mm in width and 100 mm in length to prepare measurement samples. For the other adhesive surface of the test sample, the 180-degree peel strength (N/25 mm) was measured by the above method. [Retention force] The retention force test was performed in accordance with JIS Z0237 (2004). That is, under an environment of 23° C. and 50% RH, a PET film with a thickness of 50 μm is attached to one of the adhesive surfaces of the double-sided adhesive sheet for substrate, and the substrate is cut into a width of 10 mm to prepare a measurement sample. The other adhesive surface of the measurement sample is attached to the bakelite as the adherend with a bonding area of 10 mm in width and 20 mm in length. After allowing the measurement sample attached to the adherend as described above to hang down in an environment of 80°C for 30 minutes, a load of 1 kg is applied to the free end of the measurement sample. For the sample to be measured after being placed in an environment of 80°C for 1 hour with the above load applied, the offset distance (mm) from the initial attachment position is measured. [Oil penetration distance] At 23℃, 50%RH, a PET film with a thickness of 50 μm is attached to one adhesive surface of the double-sided adhesive sheet to make a substrate, and cut into a 30 mm square for measurement. sample. After attaching the other adhesive surface of the measurement sample to a stainless steel plate (SUS304BA plate) and leaving it for 30 minutes, coat the entire back of the measurement sample (the surface of the PET film) to the stainless steel plate around the measurement sample. Buoleic acid, keep for 72 hours at 65℃ and 95%RH. Thereafter, the oleic acid was wiped off, and the distance from the outer edge of the measurement sample to the inner side of the measurement sample (the oil penetration distance) was measured. Specifically, for the four sides constituting the outer edge of the measurement sample, the distances from which oleic acid infiltrates to the innermost sides of the sides were measured, and the average value of these was calculated. [Grabability] Cut the double-sided adhesive sheets of Examples 1-15 into a size of 100 mm in length and 20 mm in width, and attach one adhesive surface to a stainless steel plate for fixing. To expose the other adhesive surface, the tester gently wiped the adhesive surface with his fingers in one direction. After repeating this operation 30 times continuously, the degree of peeling of the adhesive layer from the base film was evaluated as E (Excellent), and the initial 70 area% of the adhesive layer was evaluated as E (Excellent). The remaining condition is evaluated as G (Good), and the initial remaining 50 area% and less than 70 area% of the adhesive layer is evaluated as A (Acceptable), and the remaining on the base film The case where the adhesive layer did not reach the initial 50 area% was evaluated as P (Poor). The obtained results are shown in Tables 1 and 2 together with the outline configuration of the adhesive sheet of each example. [Table 1]

[Table 2]

As shown in Tables 1 and 2, an acrylic polymer containing more than 50% by weight of C _1-6 alkyl (meth)acrylate is used as the base polymer, and an epoxy-based crosslinking agent and an isocyanate-based The adhesive sheets of Examples 1 to 8 and Example 16 of the crosslinking agent all had an oil penetration distance of 5 mm or less, and showed good oil penetration resistance. In addition, it was confirmed that all of these adhesive sheets exhibited an excellent cohesive force (retention characteristics) with a deviation of 2.5 mm or less in the retention evaluation. The adhesive sheets of Examples 1-7 obtained particularly good results. On the other hand, with respect to 100 parts acrylic polymer embodiment the tackifying resin used in an amount of 10 parts or less 9, 10, and the main monomer of the acrylic polymer to C ₈ alkyl esters of acrylic acid in Example 11 of The oil penetration distance is long and the oil penetration resistance is low. In addition, Examples 13 and 14 in which the isocyanate-based crosslinking agent was used alone had low retention. Example 15 where the epoxy-based crosslinking agent is used alone, the oil has a longer penetration distance and lower grip. The specific examples of the present invention have been described in detail above, but these are only examples and do not limit the scope of patent application. The technology described in the scope of the patent application also includes various changes and modifications to the specific examples illustrated above.

1, 2‧‧‧Adhesive sheet 10‧‧‧Base film 10A‧‧‧First side 10B‧‧‧Second side 21‧‧‧First adhesive layer 21A‧‧‧First adhesive surface 22‧‧ ‧Second adhesive layer 22A‧‧‧Second adhesive surface 31, 32‧‧‧Release liner

Fig. 1 is a cross-sectional view schematically showing a configuration example of an adhesive sheet. Fig. 2 is a cross-sectional view schematically showing another configuration example of the adhesive sheet.

1‧‧‧Adhesive sheet

10‧‧‧Base film

10A‧‧‧Side 1

10B‧‧‧Side 2

21‧‧‧The first adhesive layer

21A‧‧‧The first adhesive surface

22‧‧‧Second adhesive layer

22A‧‧‧Second Adhesive Surface

31、32‧‧‧Release liner

Claims (10)

An adhesive sheet, which is used to fix a member in a portable device, and includes an adhesive layer formed by using an adhesive composition, the adhesive composition containing an acrylic polymer as a base polymer, Tackifying resin, and crosslinking agent, the monomer component constituting the acrylic polymer contains more than 50% by weight of alkyl (meth)acrylate having an alkyl group with 1 to 6 carbon atoms at the end of the ester, The content of the tackifying resin is more than 10 parts by weight relative to 100 parts by weight of the acrylic polymer, the crosslinking agent includes an epoxy-based crosslinking agent and an isocyanate-based crosslinking agent, and the epoxy-based crosslinking agent The content is less than 1/100 of the content of the above isocyanate-based crosslinking agent. The adhesive sheet of claim 1, wherein the tackifying resin includes a phenol-based tackifying resin. The adhesive sheet of claim 2, wherein the content of the phenolic tackifying resin is more than 10 parts by weight relative to 100 parts by weight of the acrylic polymer. The adhesive sheet according to any one of claims 1 to 3, wherein the above-mentioned tackifying resin comprises a tackifying resin having a hydroxyl value of 30 mgKOH/g or more. The adhesive sheet of any one of claims 1 to 3, wherein the above-mentioned monomer component contains 0.5% to 10% by weight of a carboxyl group-containing monomer. The adhesive sheet according to any one of claims 1 to 3, wherein the content of the epoxy-based crosslinking agent is less than 0.05 parts by weight relative to 100 parts by weight of the acrylic polymer. The adhesive sheet according to any one of claims 1 to 3, wherein the thickness of the adhesive layer is 30 μm or less. Such as the adhesive sheet of any one of claims 1 to 3, wherein the 180-degree peel strength is 17N/25mm or more. The adhesive sheet according to any one of claims 1 to 3, which further comprises a base film supporting the above-mentioned adhesive layer. The adhesive sheet of any one of claims 1 to 3, which is constituted in the form of a double-sided adhesive sheet having the above-mentioned adhesive layer on one surface and the other surface of the base film.

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