TW201610080A - Surface-protective film for transparent conductive film, and transparent conductive film using the same - Google Patents

Surface-protective film for transparent conductive film, and transparent conductive film using the same Download PDF

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TW201610080A
TW201610080A TW104121273A TW104121273A TW201610080A TW 201610080 A TW201610080 A TW 201610080A TW 104121273 A TW104121273 A TW 104121273A TW 104121273 A TW104121273 A TW 104121273A TW 201610080 A TW201610080 A TW 201610080A
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film
transparent conductive
conductive film
adhesive layer
protective film
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TWI681032B (en
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客野真人
鈴木千恵
岡本理恵
林益史
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藤森工業股份有限公司
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/30Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38Pressure-sensitive adhesives [PSA]
    • C09J7/381Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385Acrylic polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports

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

Abstract

The present invention provides a surface-protective film for a transparent conductive film in which an adhesive layer maintains smoothness of the surface, which has excellent handling properties even when attached on the transparent conductive film, which improves defects in appearance arising from the surface-protective film in the production and manufacturing and processing steps of the transparent conductive film, and which has good productivity in transparent electrode manufacturing steps for a touch panel and a transparent conductive film using the same. The present invention is a surface-protective film 5 for a transparent conductive film used by attached on the other surface of a transparent conductive film in which a transparent conductive film is formed on a surface of a resin film, wherein an adhesive layer 2 is laminated on one surface of a base film 1 by using an adhesive including an acrylic resin composition, a crosslinking agent, and a crosslinking catalyst, a storage modulus a of the adhesive layer at 30 DEG C is 4.0*105 Pa or more and the adhesive powers a and b with respect to a PET film of the adhesive layer after aging for 5 days at 40 DEG C satisfy the relationship of 0.9 ≤ a/b ≤ 2.0.

Description

透明導電性膜用表面保護膜以及使用該保護膜之透明導電性 膜 Surface protective film for transparent conductive film and transparent conductivity using the same membrane

本發明涉及貼合到在一個面上形成有透明導電膜的樹脂膜的另一個面上來使用的透明導電性膜用表面保護膜及使用此表面保護膜的透明導電性膜。更詳細地說,本發明提供一種透明導電性膜用表面保護膜及使用表面保護膜的透明導電性膜,透明導電性膜用表面保護膜中,所形成的黏合劑層維持表面的平滑性,即使貼合到透明導電性膜上也具有優異的處理性,在透明導電性膜的製造、加工製程中,起因於表面保護膜的外觀缺陷不良得到改善,且在觸控面板用透明電極製造製程中的生產性良好。 The present invention relates to a surface protective film for a transparent conductive film which is bonded to the other surface of a resin film having a transparent conductive film formed on one surface thereof, and a transparent conductive film using the surface protective film. More specifically, the present invention provides a surface protective film for a transparent conductive film and a transparent conductive film using the surface protective film, and the adhesive layer formed in the surface protective film for a transparent conductive film maintains the smoothness of the surface. Even when it is bonded to a transparent conductive film, it has excellent handleability, and in the manufacturing process of a transparent conductive film, the defect of the surface defect of the surface protection film is improved, and the manufacturing process of the transparent electrode of a touch panel is manufactured. The productivity is good.

一直以來,在觸控面板、電子紙、電磁波遮蔽材料、各種感測器、液晶面板、有機EL、太陽能電池等技術領域中,透明導電性膜(以下,有時也僅稱為“導電性膜”)被廣泛用於透明電極等形成用途。此透明導電性薄膜在基材的一個面上形成有例如由ITO(銦錫氧化物化合物)、AZO或GZO(在ZnO(氧化鋅)中添加有鋁或鎵的化合物)等構成的透明導電膜。 In the technical fields of touch panels, electronic papers, electromagnetic shielding materials, various sensors, liquid crystal panels, organic ELs, and solar cells, transparent conductive films (hereinafter sometimes referred to simply as "conductive films" ") is widely used for forming applications such as transparent electrodes. In the transparent conductive film, a transparent conductive film made of, for example, ITO (Indium Tin Oxide Compound), AZO or GZO (a compound in which aluminum or gallium is added to ZnO (zinc oxide)) is formed on one surface of the substrate. .

另外,在觸控面板用透明電極的製程中,要經過多種加熱製程和試劑處理的製程,例如,對形成有由ITO、AZO或GZO等構成的透明導電膜的透明導電性膜進行退火處理的金屬氧化膜的結晶化製程、抗蝕劑的印刷製程、蝕刻處理製程、利用銀膠形成電路配線的製程、絕緣層的印刷製程、沖裁製程等。 在這樣的透明電極的製程中,為了防止在透明導電性膜的形成有透明導電膜的面的相反側的面上產生汙損、損傷,貼合透明導電性膜用表面保護膜來使用。 In addition, in the process of the transparent electrode for a touch panel, a plurality of processes of the heating process and the reagent process are subjected to, for example, an annealing process for forming a transparent conductive film formed of a transparent conductive film made of ITO, AZO or GZO. The crystallization process of the metal oxide film, the printing process of the resist, the etching process, the process of forming the circuit wiring by using the silver paste, the printing process of the insulating layer, the punching process, and the like. In the process of the transparent electrode, in order to prevent the surface of the transparent conductive film from being on the opposite side of the surface on which the transparent conductive film is formed, the surface protective film for a transparent conductive film is bonded and used.

在透明電極的製程中,退火處理、利用銀膠的電路配線的形成等在約150℃左右的溫度下進行加熱處理,因此要求透明導電性膜用保護膜具有耐熱性。 In the process of the transparent electrode, the annealing treatment, the formation of the circuit wiring by the silver paste, and the like are performed at a temperature of about 150 ° C. Therefore, the protective film for a transparent conductive film is required to have heat resistance.

關於在觸控面板用等、透明電極的製程中使用的透明導電性膜用保護膜,提出了各種方案。例如,專利文獻1中提出了一種透明導電性膜用表面保護膜,其在由熔點為200℃以上的熱塑性樹脂膜構成的基材的單面上設置有黏合劑層。有人認為其與使用聚乙烯、聚丙烯等聚烯烴樹脂作為基材的透明導電性膜用表面保護膜相比,耐熱性良好。 Various proposals have been made regarding a protective film for a transparent conductive film used in a process of a transparent electrode for a touch panel or the like. For example, Patent Document 1 proposes a surface protective film for a transparent conductive film provided with a binder layer on one surface of a substrate composed of a thermoplastic resin film having a melting point of 200 ° C or higher. It is considered that the heat resistance is better than that of the surface protective film for a transparent conductive film using a polyolefin resin such as polyethylene or polypropylene as a substrate.

另外,專利文獻2中提出了一種透明導電性膜用表面保護膜的製造方法,其中,在含有聚對苯二甲酸乙二醇樹脂和/或聚萘二甲酸乙二酯樹脂的基材膜的單面上塗佈黏合劑後,以規定的溫度.停留時間.拉伸張力進行乾燥。通過該製造方法得到的透明導電性膜用表面保護膜在貼合到透明導電性膜上之後,即使經過加熱製程,也不會產生大的捲曲(curl)。 Further, Patent Document 2 proposes a method for producing a surface protective film for a transparent conductive film, which comprises a substrate film containing a polyethylene terephthalate resin and/or a polyethylene naphthalate resin. After applying the adhesive on one side, at the specified temperature. Stay time. The tensile tension is dried. After the surface protective film for a transparent conductive film obtained by the above-described production method is bonded to the transparent conductive film, even if it is subjected to a heating process, no large curl is generated.

專利文獻3中提出了一種帶有透明導電膜和保護 膜的樹脂膜,其中,在樹脂膜的單面上設置透明導電膜,在設置有該透明導電膜的面相反的樹脂膜面上設置保護膜,上述保護膜由第一膜和第二膜構成且從上述樹脂膜上依次設置上述第一膜和第二膜,第一膜在150℃下加熱30分鐘後的熱收縮率在MD和TD方向上均為0.5%以下,第二膜具有與上述帶有透明導電膜和保護膜的樹脂膜的線膨脹係數之差為40ppm/℃以下的線膨脹係數。若應用該發明,則能夠得到沒有因觸控面板化等加工製程中的熱處理所致的尺寸變化和捲曲的透明導電膜。 Patent Document 3 proposes a transparent conductive film and protection a resin film of a film in which a transparent conductive film is provided on one surface of a resin film, and a protective film is provided on a surface of the resin film opposite to the surface on which the transparent conductive film is provided, and the protective film is composed of a first film and a second film. And the first film and the second film are sequentially disposed on the resin film, and the heat shrinkage rate of the first film after heating at 150 ° C for 30 minutes is 0.5% or less in both the MD and TD directions, and the second film has the above The difference in linear expansion coefficient of the resin film having a transparent conductive film and a protective film is a linear expansion coefficient of 40 ppm/° C. or less. According to the invention, it is possible to obtain a transparent conductive film which is free from dimensional change and curl due to heat treatment in a processing such as touch panel formation.

另外,專利文獻4中提出了一種透明導電性膜用表 面保護膜,其通過使用規定的厚度和抗彎曲性的剝離膜,使得表面保護膜的黏合劑層表面平滑,外觀缺陷不良得到了改善。 Further, Patent Document 4 proposes a table for a transparent conductive film. The surface protective film is made to have a smooth surface of the adhesive layer of the surface protective film by using a release film having a predetermined thickness and bending resistance, and the appearance defect is improved.

【現有技術文獻】 [Prior Art Literature] 【專利文獻】 [Patent Literature]

專利文獻1:日本特開2003-170535號公報 Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-170535

專利文獻2:日本專利第4342775號公報 Patent Document 2: Japanese Patent No. 4342775

專利文獻3:日本特開平11-268168號公報 Patent Document 3: Japanese Patent Laid-Open No. Hei 11-268168

專利文獻4:日本特開2013-226676號公報 Patent Document 4: Japanese Laid-Open Patent Publication No. 2013-226676

本發明提供與專利文獻4同樣地表面保護膜的黏合劑層維持表面的平滑性、外觀缺陷不良得到改善的透明導電性膜用表面保護膜。專利文獻4的表面保護膜的特徵在於使用了40℃時抗彎曲性為0.30mN~40mN的剝離膜,但具有該抗彎 曲性的膜存在厚度變厚、成本增高的問題。另外,在表面保護膜的製造時或者使用者使用表面保護膜時,根據所使用的加工機械的規格,表面保護膜的纏繞直徑有時受到限制。這種情況下,對於使用了基材厚度厚的剝離膜的表面保護膜而言,與使用了基材厚度薄的剝離膜的表面保護膜相比,存在如下問題:以規定卷起直徑卷起時的卷起長度變短,在觸控面板用透明電極製程中的生產性下降。 In the same manner as in the case of the patent document 4, the adhesive layer of the surface protective film maintains the smoothness of the surface and the surface protective film for a transparent conductive film having improved appearance defects. The surface protective film of Patent Document 4 is characterized in that a release film having a bending resistance of 0.30 mN to 40 mN at 40 ° C is used, but the bending resistance is obtained. The curved film has a problem that the thickness is increased and the cost is increased. Further, when the surface protective film is manufactured or when the user uses the surface protective film, the winding diameter of the surface protective film may be limited depending on the specifications of the processing machine to be used. In this case, as for the surface protective film using the release film having a thick substrate thickness, compared with the surface protective film using the release film having a thin substrate thickness, there is a problem that the diameter is rolled up by a predetermined winding diameter. The roll-up length becomes shorter, and the productivity in the transparent electrode process for the touch panel is degraded.

本發明是鑒於上述情況而完成的,其課題在於提 供一種透明導電性膜用表面保護膜及使用該表面保護膜的透明導電性膜,透明導電性膜用表面保護膜在從滾筒反繞的狀態下,透明導電性膜用表面保護膜的黏合劑層維持表面的平滑性,即使貼合到透明導電性膜上也具有優異的處理性,在透明導電性膜的製造、加工製程中,起因於透明導電性膜用表面保護膜的外觀缺陷不良得到改善,且在觸控面板用透明電極製程中的生產性良好。 The present invention has been made in view of the above circumstances, and the object thereof is to provide A surface protective film for a transparent conductive film and a transparent conductive film using the surface protective film, and a surface protective film for a transparent conductive film in a state of being rewinded from a roll, and a surface protective film for a transparent conductive film The layer maintains the smoothness of the surface, and has excellent handleability even when it is bonded to the transparent conductive film. In the process of manufacturing and processing the transparent conductive film, the surface defects of the surface protective film for the transparent conductive film are poor. Improved and good productivity in the transparent electrode process for touch panels.

透明導電性膜用表面保護膜通過如下方法來製造:在基材膜或剝離膜上塗佈黏合劑,在乾燥製程中使黏合劑中的溶劑蒸發後,貼合剝離膜或基材膜,並捲成捲筒形狀。本發明人進行了深入研究,結果發現,乾燥開始15分鐘後的黏合劑層的固化狀態與黏合劑層的表面的凹凸狀變形相關。進而發現,通過使用黏合劑層在乾燥開始後15分鐘以內發生固化的黏合劑,即使在將基材厚度較薄的剝離膜用於透明導電性膜用表面保護膜的黏合劑層的貼合用途的情況下,也能夠抑制在上述 黏合劑層的待貼合到被黏附物上的表面產生凹凸的變形,從而完成了本發明。 The surface protective film for a transparent conductive film is produced by applying a binder to a base film or a release film, evaporating the solvent in the adhesive in a drying process, and then adhering the release film or the base film, and Rolled into a roll shape. As a result of intensive studies, the inventors have found that the cured state of the adhesive layer 15 minutes after the start of drying is related to the uneven deformation of the surface of the adhesive layer. Further, it has been found that the adhesive which is cured within 15 minutes after the start of drying by using the adhesive layer is used for the bonding of the adhesive layer having a thin substrate thickness to the adhesive layer for the transparent conductive film. In the case of the above, it is also possible to suppress The surface of the adhesive layer to be attached to the surface to be adhered is deformed by unevenness, thereby completing the present invention.

在表面保護膜的製程中,通常在基材膜上塗佈黏 合劑並使其乾燥而形成黏合劑層後,在捲筒狀態下進行熟化,但在此熟化期間中,會由於捲筒的捲緊等的影響而產生剝離膜的變形。因此,在剝離膜變形後黏合劑層固化的情況下,剝離膜的表面形狀轉印到黏合劑層的表面,經過透明導電性膜的製造、加工製程時,這會成為透明導電性膜的外觀顯著變差的原因。 In the process of the surface protective film, the adhesive film is usually applied on the substrate film. After the mixture is dried and formed into a binder layer, it is aged in a roll state, but during the aging period, deformation of the release film occurs due to the influence of winding of the roll or the like. Therefore, when the adhesive layer is cured after the release film is deformed, the surface shape of the release film is transferred to the surface of the adhesive layer, and when the transparent conductive film is manufactured or processed, the appearance of the transparent conductive film becomes remarkable. The reason for the deterioration.

本發明技術構思如下:在將透明導電性膜用表面 保護膜以捲筒狀進行熟化的期間,在剝離膜發生變形之前進行黏合劑層的固化,由此,即使剝離膜發生變形,也可抑制黏合劑層的表面的變形,從而維持平滑性。 The technical idea of the present invention is as follows: a surface for a transparent conductive film When the protective film is aged in a roll shape, the adhesive layer is cured before the release film is deformed, whereby even if the release film is deformed, deformation of the surface of the adhesive layer can be suppressed, and smoothness can be maintained.

即,在將本發明所涉及的透明導電性膜用表面保護膜以捲筒狀進行熟化的期間,在貼合有剝離膜的黏合劑層受到剝離膜的變形的牽拉而變形之前,進行黏合劑層的固化,防止在貼合到被粘物上的黏合劑層的表面產生凹凸,從而維持平滑性。 In the meantime, the surface protective film for a transparent conductive film according to the present invention is cured in a roll shape, and is bonded before the adhesive layer in which the release film is bonded is deformed by the deformation of the release film. The curing of the agent layer prevents unevenness on the surface of the adhesive layer attached to the adherend, thereby maintaining smoothness.

本發明人發現,通過對黏合劑層的乾燥開始15分鐘後和老化(熟化)完成後的黏合劑層的力進行比較,能夠掌握黏合劑層的固化的進行狀態。更具體地說,如果黏合劑層的乾燥開始15分鐘後和老化(熟化)完成後的黏合劑層對PET膜的黏合力的比例(用老化完成後的黏合力除以乾燥開始15分鐘後的黏合力而得到的數值)在預定的範圍內,則即使在將基材厚度薄的剝離膜用於透明導電性膜用表面保護膜的黏合劑層的貼合用途的 情況下,也能夠抑制在上述黏合劑層的待貼合到被粘物上的表面產生凹凸的變形。 The present inventors have found that it is possible to grasp the progress state of the curing of the adhesive layer by comparing the force of the adhesive layer after the start of drying of the adhesive layer for 15 minutes and after the aging (aging). More specifically, if the adhesion of the adhesive layer is 15 minutes later and after the aging (aging) is completed, the ratio of the adhesion of the adhesive layer to the PET film (after the aging is completed, the adhesion is divided by 15 minutes after the start of drying). When the value obtained by the adhesive force is within a predetermined range, the peeling film having a thin substrate thickness is used for the bonding of the adhesive layer of the surface protective film for a transparent conductive film. In this case, it is also possible to suppress deformation in which the surface of the adhesive layer to be bonded to the adherend is uneven.

為了解決上述課題,本發明提供如下的透明導電性膜用表面保護膜。 In order to solve the above problems, the present invention provides the following surface protective film for a transparent conductive film.

一種透明導電性膜用表面保護膜,其貼合到在一個面上形成有透明導電膜的樹脂膜的另一個面上來使用,其特徵在於,該透明導電性膜用表面保護膜在基材膜的單面上使用含有丙烯酸類樹脂組合物、交聯劑和交聯觸媒的丙烯酸類黏合劑疊層黏合劑層而成,所述黏合劑層在30℃時的儲存模數為4.0×105Pa以上,且所述黏合劑層的乾燥開始15分鐘後的所述黏合劑層對PET膜的黏合力與在40℃下老化5天後的所述黏合劑層對PET膜的黏合力滿足下式(1)的關係。 A surface protective film for a transparent conductive film which is bonded to the other surface of a resin film having a transparent conductive film formed on one surface thereof, characterized in that the surface protective film for the transparent conductive film is on the substrate film The adhesive layer of the acrylic adhesive layer containing the acrylic resin composition, the crosslinking agent and the crosslinking catalyst is laminated on one side, and the storage modulus of the adhesive layer at 4.0 ° C is 4.0×10. 5 Pa or more, and the adhesion of the adhesive layer to the PET film after 15 minutes from the start of drying of the adhesive layer and the adhesion of the adhesive layer to the PET film after aging for 5 days at 40 ° C are satisfied. The relationship of the following formula (1).

(此處,a為所述黏合劑層的乾燥開始15分鐘後的所述黏合劑層對PET膜的黏合力,b為在40℃下老化5天後的所述黏合劑層對PET膜的黏合力) (here, a is the adhesion of the adhesive layer to the PET film after 15 minutes from the start of drying of the adhesive layer, and b is the adhesion of the adhesive layer to the PET film after aging at 40 ° C for 5 days. Adhesion)

另外,本發明提供一種透明導電性膜,其為將上述的透明導電性膜用表面保護膜貼合到在一個面上形成有透明導電膜的樹脂膜的另一個面上得到的透明導電性膜。 Moreover, the present invention provides a transparent conductive film obtained by bonding the surface protective film for a transparent conductive film described above to the other surface of a resin film having a transparent conductive film formed on one surface thereof. .

本發明提供一種透明導電性膜用表面保護膜及使用表面保護膜的透明導電性膜,本發明的透明導電性膜用表面保護膜在從滾筒反繞的狀態下,所形成的黏合劑層維持表面的平滑性,即使貼合到透明導電性膜上也具有優異的處理性,在 透明導電性膜的製造、加工製程中,起因於表面保護膜的外觀缺陷不良得到改善,且在觸控面板用透明電極製程中的生產性良好。 The present invention provides a surface protective film for a transparent conductive film and a transparent conductive film using the surface protective film. The surface protective film for a transparent conductive film of the present invention is maintained in a state in which the adhesive layer is formed by rewinding from the roll. Smoothness of the surface, even when applied to a transparent conductive film, has excellent handleability. In the manufacturing process of the transparent conductive film, the defects of the appearance defects due to the surface protective film are improved, and the productivity in the transparent electrode process for a touch panel is good.

另外,近年來,隨著智慧手機等高功能便攜終端的殼體的薄型化,所使用的透明導電性膜的薄型化不斷進展。本發明的透明導電性膜用表面保護膜在觸控面板用透明電極的製程中,即使在貼合到薄型化的透明導電性膜上的狀態下經過加熱製程後,產生的捲曲也非常小。由此,能夠大幅改善觸控面板用透明電極的製程的作業性、生產效率。 In addition, in recent years, as the casing of a high-function portable terminal such as a smart phone has become thinner, the thickness of the transparent conductive film to be used has been increasing. In the process for producing a transparent electrode for a touch panel, the surface protective film for a transparent conductive film of the present invention has a very small curl generated by a heating process even in a state of being bonded to a thin transparent conductive film. Thereby, the workability and production efficiency of the process of the transparent electrode for touch panels can be greatly improved.

1‧‧‧基材膜 1‧‧‧Base film

2‧‧‧黏合劑層 2‧‧‧Binder layer

3‧‧‧剝離膜 3‧‧‧Release film

4‧‧‧黏合膜 4‧‧‧Adhesive film

5‧‧‧透明導電性膜用表面保護膜 5‧‧‧Surface protective film for transparent conductive film

6‧‧‧樹脂膜 6‧‧‧ resin film

6a‧‧‧樹脂膜的一個面 6a‧‧‧One side of the resin film

6b‧‧‧樹脂膜的另一個面 6b‧‧‧The other side of the resin film

7‧‧‧透明導電膜 7‧‧‧Transparent conductive film

10‧‧‧透明導電性膜 10‧‧‧Transparent conductive film

11‧‧‧疊層膜 11‧‧‧Laminated film

21‧‧‧剝離膜的滾筒 21‧‧‧Rolling roller

22‧‧‧基材膜的滾筒 22‧‧‧Roller for substrate film

23‧‧‧黏合劑塗佈裝置 23‧‧‧Binder coating device

24‧‧‧乾燥爐 24‧‧‧ drying oven

25、26‧‧‧壓力滾輪 25, 26‧‧‧ pressure roller

27‧‧‧透明導電性膜用表面保護膜的滾筒 27‧‧‧Roller for surface protective film for transparent conductive film

【第1圖】為表示本發明的透明導電性膜用表面保護膜的一例的剖面圖。 [Fig. 1] Fig. 1 is a cross-sectional view showing an example of a surface protective film for a transparent conductive film of the present invention.

【第2圖】為表示將本發明的透明導電性膜用表面保護膜貼合到透明導電性膜上的例子的剖面圖。 [Fig. 2] Fig. 2 is a cross-sectional view showing an example in which a surface protective film for a transparent conductive film of the present invention is bonded to a transparent conductive film.

【第3圖】為表示本發明的透明導電性膜用表面保護膜的製造方法的一例的示意圖。 [Fig. 3] is a schematic view showing an example of a method for producing a surface protective film for a transparent conductive film of the present invention.

以下,基於實施方式對本發明進行詳細說明。 Hereinafter, the present invention will be described in detail based on embodiments.

第1圖為表示本發明的透明導電性膜用表面保護膜的一例的剖面圖。此透明導電性膜用表面保護膜5在透明的具有可撓性的基材膜1的單面上疊層有黏合劑層2。黏合劑層2之待貼合至被黏附物的表面上,藉由已剝離處理的面,疊層著用以保護黏合劑層的表面之已剝離處理的剝離膜3。 Fig. 1 is a cross-sectional view showing an example of a surface protective film for a transparent conductive film of the present invention. The surface protective film 5 for a transparent conductive film has a pressure-sensitive adhesive layer 2 laminated on one surface of a transparent flexible substrate film 1. The adhesive layer 2 is to be bonded to the surface of the adherend, and the release-treated release film 3 for protecting the surface of the adhesive layer is laminated by the peeled surface.

作為基材膜1,使用透明的具有可撓性的塑膠膜。 由此,能夠在將本發明的透明導電性膜用表面保護膜貼合黏合到在基材的一個面上形成有透明導電膜的透明導電性膜的另一個面上的狀態下直接進行導電性膜的外觀檢查。作為用作基材膜1的塑膠膜,可以舉出較佳的有聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯、聚間苯二甲酸乙二酯、聚對苯二甲酸丁二酯等聚酯膜。另外,除了聚酯膜以外,只要是具有所需的強度且具有光學適性的塑膠膜,則也可以使用其他樹脂種類的塑膠膜。基材膜1為未拉伸膜、單向或雙軸延伸膜等,沒有特別限制,但以基材膜的加熱收縮率低的較佳。 As the base film 1, a transparent flexible plastic film is used. Thus, the surface of the transparent conductive film for a transparent conductive film of the present invention can be directly bonded to the other surface of the transparent conductive film having the transparent conductive film formed on one surface of the substrate. The appearance of the film is checked. As the plastic film used as the substrate film 1, preferred are polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate. A polyester film such as a diester. Further, in addition to the polyester film, a plastic film of another resin type may be used as long as it is a plastic film having desired strength and optical compatibility. The base film 1 is an unstretched film, a unidirectional or biaxially stretched film, or the like, and is not particularly limited, but preferably has a low heat shrinkage ratio of the base film.

另外,本發明所涉及的透明導電性膜用表面保護 膜的基材膜1的厚度沒有特別限制,根據所使用的透明導電性膜選擇即可。在使用的透明導電性膜厚至100μm以上的情況下,透明導電性膜本身的處理性不會太差,因此,表面保護膜主要著眼於對透明導電性膜的表面進行保護即可。因此,可以使用表面保護膜的基材膜1的厚度為25~75μm左右的表面保護膜。 Further, the surface protection of the transparent conductive film according to the present invention The thickness of the base film 1 of the film is not particularly limited, and may be selected depending on the transparent conductive film to be used. When the thickness of the transparent conductive film to be used is 100 μm or more, the handleability of the transparent conductive film itself is not so bad. Therefore, the surface protective film mainly focuses on protecting the surface of the transparent conductive film. Therefore, a surface protective film having a thickness of the base film 1 of the surface protective film of about 25 to 75 μm can be used.

另一方面,在所使用的透明導電性膜薄至50μm以 下的情況下,透明導電性膜本身的處理性差,因此,也要考慮表面保護膜的處理性,使用基材膜的厚度厚的透明導電性膜較佳。作為具體的基材膜的厚度,以100~188μm左右較佳。 On the other hand, the transparent conductive film used is as thin as 50 μm. In the case of the following, since the handleability of the transparent conductive film itself is inferior, the handleability of the surface protective film is also considered, and it is preferable to use a transparent conductive film having a thick base film. The thickness of the specific base film is preferably about 100 to 188 μm.

另外,可以根據需要在基材膜1的疊層有黏合劑層 2的面之相反面上疊層以防止表面污垢為目的的防汙層、抗靜電層、寡聚物防止層、防止損傷的硬塗層或者進行電暈放電處 理、錨固塗佈處理等易黏合性的處理。 In addition, an adhesive layer may be laminated on the substrate film 1 as needed. An antifouling layer, an antistatic layer, an oligomer preventing layer, a hard coat layer for preventing damage, or a corona discharge layer laminated on the opposite surface of the surface of 2 to prevent surface fouling Treatment such as adhesion and anchor coating treatment.

本發明所涉及的透明導電性膜用表面保護膜的黏 合劑層2為丙烯酸類黏合劑較佳。特別為將丙烯酸類黏合劑和交聯劑在即將使用之前進行配製(配合)的二液型黏合劑較佳。 The viscosity of the surface protective film for a transparent conductive film according to the present invention The mixture layer 2 is preferably an acrylic adhesive. In particular, a two-part type adhesive which is prepared (mixed) before the use of the acrylic adhesive and the crosslinking agent is preferred.

作為丙烯酸類黏合劑,在(甲基)丙烯酸類聚合物 (丙烯酸類樹脂組合物)中添加有交聯劑且根據需要添加有賦粘劑的黏合劑較佳。(甲基)丙烯酸類聚合物通常為丙烯酸正丁酯、丙烯酸-2-乙基己酯、丙烯酸異辛酯、丙烯酸異壬酯等主要單體與丙烯腈、醋酸乙烯酯、甲基丙烯酸甲酯、丙烯酸乙酯等共聚單體、丙烯酸、甲基丙烯酸、丙烯酸羥乙酯、丙烯酸羥丁酯、縮水甘油甲基丙烯酸酯、N-羥甲基甲基丙烯醯胺等官能性單體共聚合而成的聚合物。構成(甲基)丙烯酸類聚合物的單體組成其較佳的為(甲基)丙烯酸類單體為50%以上,(甲基)丙烯酸類單體也可以為100%。 As an acrylic binder, in (meth)acrylic polymers It is preferable that a binder is added to the (acrylic resin composition) and a binder is added as needed. The (meth)acrylic polymer is usually a main monomer such as n-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate or isodecyl acrylate with acrylonitrile, vinyl acetate or methyl methacrylate. Copolymerization of comonomers such as ethyl acrylate, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxybutyl acrylate, glycidyl methacrylate, N-methylol methacrylamide, etc. The resulting polymer. The monomer composition constituting the (meth)acrylic polymer is preferably 50% or more of the (meth)acrylic monomer, and the (meth)acrylic monomer may be 100%.

作為交聯劑,可以舉出異氰酸酯化合物、環氧化 合物、三聚氰胺化合物、金屬螯合化合物等,其中較佳的為異氰酸酯化合物。進一步在一分子中具有至少2個或3個以上的異氰酸酯(NCO)基的多異氰酸酯化合物較佳。 As a crosslinking agent, an isocyanate compound and epoxidation are mentioned. A compound, a melamine compound, a metal chelate compound or the like, among which an isocyanate compound is preferred. Further, a polyisocyanate compound having at least two or more isocyanate (NCO) groups in one molecule is preferred.

多異氰酸酯化合物雖然分為脂肪族類異氰酸酯、芳香族類異氰酸酯、非環類異氰酸酯、脂肪環類異氰酸酯等,可以為任意一種。作為二官能的異氰酸酯化合物的具體例,可以舉出六亞甲基二異氰酸酯(HDI)、異佛爾酮二異氰酸酯(IPDI)、三甲基六亞甲基二異氰酸酯(TMDI)等脂肪族類異氰酸酯化合物;二苯甲烷二異氰酸酯(methylene diphenyl diisocyanate,MDI)、二亞 甲苯二異氰酸酯(xylylene diisocyanate,XDI)、氫化苯二甲基苯二異氰酸酯(H6XDI)、聯鄰甲苯二異氰酸酯(o-tolidine Diisocyanate,TOID)、甲苯二異氰酸酯(TDI)等芳香族類異氰酸酯化合物。 The polyisocyanate compound may be classified into an aliphatic isocyanate, an aromatic isocyanate, an acyclic isocyanate, an aliphatic cyclic isocyanate, or the like, and may be any. Specific examples of the difunctional isocyanate compound include aliphatic isocyanates such as hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and trimethylhexamethylene diisocyanate (TMDI). a compound; methylene diphenyl diisocyanate (MDI), xylylene diisocyanate (XDI), hydrogenated dimethyl dimethyl diisocyanate (H6XDI), o- tolidine diisocyanate, An aromatic isocyanate compound such as TOID) or toluene diisocyanate (TDI).

作為三官能以上的異氰酸酯化合物,可以舉出二異氰酸酯類(在一分子中具有2個NCO基的化合物)的縮二脲型改質物、三聚異氰酸酯型改質物;與三羥甲基丙烷(TMP)、甘油等三價以上的多元醇(在一分子中具有至少3個以上OH基的化合物)的加成物(多元醇改質物)等。 Examples of the trifunctional or higher isocyanate compound include a biuret-type modified product of a diisocyanate (a compound having two NCO groups in one molecule) and a trimerized isocyanate-type modified product; and trimethylolpropane (TMP) An adduct (polyol modified product) of a trivalent or higher polyvalent alcohol (a compound having at least three or more OH groups in one molecule) such as glycerin.

交聯劑的添加量雖然考慮(甲基)丙烯酸類聚合物 的種類、聚合度、官能團量等來確定即可,沒有特別限定,但通常相對於(甲基)丙烯酸類聚合物100重量份,交聯劑為0.5~10重量份左右。 The amount of cross-linking agent is considered as a (meth)acrylic polymer The type, the degree of polymerization, the amount of the functional group, and the like are not particularly limited, but the crosslinking agent is usually about 0.5 to 10 parts by weight based on 100 parts by weight of the (meth)acrylic polymer.

另外,本發明所涉及的透明導電性膜用表面保護 膜在以捲筒狀進行熟化的期間,需要在剝離膜變形之前使黏合劑層進行固化,因此,為了促進(甲基)丙烯酸類聚合物與交聯劑的交聯反應,添加交聯觸媒較佳。交聯觸媒只要是對(甲基)丙烯酸類聚合物與交聯劑的反應(交聯反應)起觸媒作用的物質即可,在以多異氰酸酯化合物作為交聯劑的情況下,可以舉出三級胺等胺類化合物、有機錫化合物、有機鉛化合物、有機鋅化合物、有機鐵化合物等有機金屬化合物。 Further, the surface protection of the transparent conductive film according to the present invention When the film is aged in a roll shape, it is necessary to cure the adhesive layer before the release film is deformed. Therefore, in order to promote the crosslinking reaction between the (meth)acrylic polymer and the crosslinking agent, a crosslinking catalyst is added. Preferably. The crosslinking catalyst may be one which acts as a catalyst for the reaction (crosslinking reaction) of the (meth)acrylic polymer and the crosslinking agent, and when the polyisocyanate compound is used as the crosslinking agent, An organometallic compound such as an amine compound such as a tertiary amine, an organotin compound, an organic lead compound, an organozinc compound or an organic iron compound is used.

作為三級胺,可以舉出三烷基胺、N,N,N’,N’-四烷基二胺、N,N-二烷基氨基醇、三伸乙二胺、嗎福啉衍生物、哌嗪衍生物等。 Examples of the tertiary amine include a trialkylamine, N,N,N',N'-tetraalkyldiamine, N,N-dialkylamino alcohol, triethylene glycol diamine, and morpholin derivative. , piperazine derivatives, and the like.

作為有機錫化合物,可以舉例如二烷基氧化錫、二烷基錫的脂肪酸鹽、亞錫的脂肪酸鹽等。 The organotin compound may, for example, be a dialkyltin oxide, a fatty acid salt of a dialkyltin or a fatty acid salt of stannous.

交聯觸媒的添加量考慮(甲基)丙烯酸類聚合物的種類、聚合度、官能團量、交聯觸媒的種類、添加量等來確定即可,雖然沒有特別限定,相對於丙烯酸類聚合物100重量份,通常為0.01~0.5重量份左右。 The amount of the crosslinking catalyst to be added may be determined in consideration of the type of the (meth)acrylic polymer, the degree of polymerization, the amount of the functional group, the type of the crosslinking catalyst, the amount of addition, and the like, and is not particularly limited, and is polymerized with respect to the acrylic acid. 100 parts by weight of the substance is usually about 0.01 to 0.5 parts by weight.

另外,為了抑制交聯劑配製後的黏合劑組合物的 過度的黏度上升、凝膠化、延長黏合劑組合物的適用期,可以根據需要含有交聯延遲劑。 In addition, in order to suppress the binder composition after the preparation of the crosslinking agent Excessive viscosity rise, gelation, and prolongation of the pot life of the adhesive composition may include a crosslinking retarder as needed.

作為交聯延遲劑,可以舉出乙醯乙酸甲酯、乙醯乙酸乙酯、乙醯乙酸辛酯、乙醯乙酸油酯、乙醯乙酸月桂酯、乙醯乙酸硬脂酯等β-酮酸酯、乙醯丙酮、2,4-己二酮、苯甲醯丙酮等β-二酮。特別為選自由乙醯丙酮、乙醯乙酸乙酯組成的化合物組中的至少一種以上較佳。這些交聯延遲劑為酮-烯醇互變異構化合物,在以多異氰酸酯化合物作為交聯劑的黏合劑組合物中,透過封閉交聯劑所具有的異氰酸酯基,能夠抑制交聯劑配製後的黏合劑組合物的過度的黏度上升、凝膠化,能夠延長黏合劑組合物的適用期。 Examples of the crosslinking retardation agent include β-keto acid such as methyl acetoacetate, ethyl acetate, octyl acetate, acetonitrile acetate, lauryl acetate, and stearyl acetate. a β-diketone such as ester, acetamidine acetone, 2,4-hexanedione or benzamidineacetone. In particular, it is preferably at least one selected from the group consisting of ethyl acetate and ethyl acetate. These crosslinking retardation agents are keto-enol tautomer compounds, and in the binder composition having a polyisocyanate compound as a crosslinking agent, the isocyanate group which is blocked by the crosslinking agent can inhibit the preparation of the crosslinking agent. The excessive viscosity and gelation of the adhesive composition can prolong the pot life of the adhesive composition.

交聯延遲劑的添加量雖然沒有特別限定,相對於(甲基)丙烯酸類聚合物100重量份,通常添加1.0~5.0重量份左右。 The amount of the crosslinking retardation agent to be added is not particularly limited, and is usually about 1.0 to 5.0 parts by weight based on 100 parts by weight of the (meth)acrylic polymer.

另外,可以根據需要在黏合劑中添加賦黏劑。作 為賦黏劑,可以舉出松香類、苯井呋喃-茚系、萜烯類、石油類、酚類等。 In addition, an adhesive may be added to the adhesive as needed. Make Examples of the tackifier include rosin, benzofuran-quinone, terpene, petroleum, and phenol.

另外,在本發明所涉及的透明導電性膜用表面保 護膜的黏合劑層2中,可以根據需要混合抗靜電劑。作為抗靜電劑,較佳的為在(甲基)丙烯酸類聚合物中的分散性或與(甲基)丙烯酸類聚合物相容性良好的抗靜電劑。作為可使用的抗靜電劑,可以舉例如表面活性劑類、離子液體、鹼金屬鹽、金屬氧化物、金屬微粒、導電性聚合物、碳、奈米碳管等。從透明性、與(甲基)丙烯酸類聚合物的親和性等角度出發,表面活性劑類、離子液體、鹼金屬鹽等較佳。抗靜電劑相對於黏合劑的添加量可以考慮抗靜電劑的種類、與基礎聚合物的相容性來適當確定。另外,考慮將本發明所涉及的透明導電性膜用表面保護膜從透明導電性膜剝離時所需要的剝離電壓、被黏物的污染性、黏合力等來具體設定抗靜電劑的種類、添加量。 In addition, the surface of the transparent conductive film according to the present invention is protected by a surface. In the adhesive layer 2 of the film, an antistatic agent may be mixed as needed. The antistatic agent is preferably an antistatic agent which is dispersible in a (meth)acrylic polymer or which is compatible with a (meth)acrylic polymer. Examples of the antistatic agent that can be used include surfactants, ionic liquids, alkali metal salts, metal oxides, metal fine particles, conductive polymers, carbon, and carbon nanotubes. Surfactants, ionic liquids, alkali metal salts and the like are preferred from the viewpoints of transparency, affinity with a (meth)acrylic polymer, and the like. The amount of the antistatic agent to be added to the binder can be appropriately determined in consideration of the kind of the antistatic agent and the compatibility with the base polymer. In addition, the type of the antistatic agent and the addition of the antistatic agent are specifically set in consideration of the peeling voltage, the contamination of the adherend, the adhesive force, and the like which are required when the surface protective film for a transparent conductive film of the present invention is peeled off from the transparent conductive film. the amount.

另外,本發明所涉及的透明導電性膜用表面保護 膜的黏合劑層2的厚度雖然沒有特別限定,較佳的例如為5~50μm左右的厚度,進一步以5~30μm左右的厚度較佳。黏合劑層2的厚度超過50μm時,製造透明導電性膜用表面保護膜的成本增大,因此損害競爭力。黏合劑層2的厚度小於5μm時,存在如下問題:對透明導電性膜的密合性降低,或者,在將表面保護膜貼合到透明導電性膜上時混入有異物的情況下,透明導電性膜大幅變形。 Further, the surface protection of the transparent conductive film according to the present invention The thickness of the adhesive layer 2 of the film is not particularly limited, but is preferably, for example, a thickness of about 5 to 50 μm, and more preferably a thickness of about 5 to 30 μm. When the thickness of the adhesive layer 2 exceeds 50 μm, the cost of producing the surface protective film for a transparent conductive film increases, which impairs competitiveness. When the thickness of the adhesive layer 2 is less than 5 μm, there is a problem that the adhesion to the transparent conductive film is lowered, or when a surface protective film is bonded to the transparent conductive film, foreign matter is mixed therein, and transparent conductive is used. The film is greatly deformed.

另外,本發明所涉及的透明導電性膜用表面保護膜的黏合劑層2為對被黏附物表面的剝離強度為0.05~0.5N/25mm左右的,具有輕度黏合性的微黏合劑層較佳。透過製成具有這樣的微黏合劑層的透明導電性膜用表面保護膜,能夠得到容易從被黏附物剝離的優異的操作性。 Further, the adhesive layer 2 of the surface protective film for a transparent conductive film according to the present invention has a peel strength of about 0.05 to 0.5 N/25 mm on the surface of the adherend, and a micro-adhesive layer having a slight adhesiveness. good. By providing the surface protective film for a transparent conductive film having such a micro-adhesive layer, it is possible to obtain excellent workability which is easily peeled off from the adherend.

另外,本發明所涉及的透明導電性膜用表面保護 膜的剝離膜3的材質沒有特別限定。作為可使用的剝離膜的材質,可以舉例如聚乙烯膜、聚丙烯膜、聚甲基戊烯膜等聚烯烴膜、在聚酯膜等膜的表面上使用聚矽氧烷系剝離劑等剝離劑實施了剝離處理的剝離膜、氟樹脂膜、聚醯亞胺膜等。另外,也可以為將複數膜使用接合劑疊層而成的膜、在膜上熔融擠出樹脂並疊層而成的疊層膜。在這些單層膜或疊層膜上使用聚矽氧烷系剝離劑等剝離劑實施剝離處理,得到剝離膜。 Further, the surface protection of the transparent conductive film according to the present invention The material of the release film 3 of the film is not particularly limited. The material of the release film which can be used is, for example, a polyolefin film such as a polyethylene film, a polypropylene film or a polymethylpentene film, or a release film using a polyoxyalkylene-based release agent or the like on the surface of a film such as a polyester film. The release film, the fluororesin film, the polyimide film, and the like which have been subjected to the release treatment are applied. Further, a film obtained by laminating a plurality of films using a bonding agent, a film obtained by melt-extruding a resin on a film, and laminating them may be used. A release treatment is performed on the single-layer film or the laminate film using a release agent such as a polyoxyalkylene-based release agent to obtain a release film.

另外,本發明所涉及的透明導電性膜用表面保護 膜的剝離膜3的厚度沒有特別限制,選擇易於使用的厚度的剝離膜即可。通常多為19μm~75μm左右的剝離膜。 Further, the surface protection of the transparent conductive film according to the present invention The thickness of the release film 3 of the film is not particularly limited, and a release film having a thickness that is easy to use may be selected. Usually, it is usually a release film of about 19 μm to 75 μm.

剝離膜3較厚時,在捲成滾筒狀的相同纏繞直徑的滾筒中,透明導電性膜用表面保護膜的全長縮短、製造成本增加,因此,需引導剝離膜3至適當的厚度。另外,剝離膜3較佳的為對單層聚酯膜進行剝離處理而得到的剝離膜、對使用接合劑將聚酯膜多層疊層成的膜實施剝離處理而得到的剝離膜。 When the release film 3 is thick, the entire length of the surface protective film for a transparent conductive film is shortened in the roll having the same winding diameter, and the manufacturing cost is increased. Therefore, the release film 3 needs to be guided to an appropriate thickness. Further, the release film 3 is preferably a release film obtained by subjecting a single-layer polyester film to a release treatment, and a release film obtained by subjecting a film obtained by laminating a plurality of polyester films to a laminate using a bonding agent.

另外,在基材膜1上依次疊層黏合劑層2和剝離膜3 的方法通過公知的方法進行即可,沒有特別限定。具體地說,可以為在基材膜1上塗佈黏合劑層2並乾燥後貼合剝離膜3的方法、在剝離膜3上塗佈黏合劑層2並乾燥後貼合基材膜1的方法等中的任意一種方法。 Further, the adhesive layer 2 and the release film 3 are sequentially laminated on the substrate film 1. The method can be carried out by a known method, and is not particularly limited. Specifically, a method in which the adhesive layer 2 is applied onto the base film 1 and dried, and then the release film 3 is bonded, and the adhesive layer 2 is applied onto the release film 3 and dried, and then the base film 1 is bonded. Any of the methods and the like.

另外,在基材膜1上形成黏合劑層可以通過公知的方法進行。具體地說,可以採用逆向塗佈法、刮刀塗佈法(comma coat)、凹版印刷法、縫模塗佈法、梅爾棒塗佈(Mayer bar coat) 法、氣刀塗佈(anchor coat)法等公知的塗佈方法。 Further, the formation of the adhesive layer on the base film 1 can be carried out by a known method. Specifically, a reverse coating method, a comma coat method, a gravure printing method, a slit die coating method, a Mayer bar coat can be employed. A known coating method such as a method or an oven coat method.

另外,對剝離膜3實施剝離處理的方法通過公知的 方法進行即可。具體地說,通過凹版印刷法、梅爾棒塗佈(Mayer bar coat)法、氣刀塗佈(anchor coat)法等塗佈方法在剝離膜3的單面上塗佈剝離劑並通過加熱或紫外線照射等對剝離劑進行乾燥、固化即可。也可以根據需要對要進行剝離處理的膜預先進行電暈處理、電漿處理、錨固塗佈等使剝離劑對膜的密合性提高的預處理。 Further, a method of performing a peeling treatment on the release film 3 is known. The method can be carried out. Specifically, a release agent is applied to one surface of the release film 3 by a coating method such as a gravure printing method, a Mayer bar coating method, or an oven coat method, and is heated or The release agent may be dried and solidified by ultraviolet irradiation or the like. The film to be subjected to the release treatment may be subjected to a pretreatment such as corona treatment, plasma treatment, or anchor coating to improve the adhesion of the release agent to the film.

另外,圖2為表示將本發明的透明導電性膜用表面 保護膜貼合到透明導電性膜上而成的疊層膜11的一例的示意性構成圖。 2 is a surface showing a transparent conductive film of the present invention. A schematic configuration diagram of an example of the laminated film 11 in which a protective film is bonded to a transparent conductive film.

此疊層膜11為將黏合膜4利用其黏合劑層2貼合到透明導電性膜10的表面而成的疊層膜,黏合膜4是從本發明的透明導電性膜用表面保護膜5上剝下剝離膜3而得到的。透明導電性膜10在樹脂膜6的一個面6a上形成有透明導電膜7。黏合膜4貼合在樹脂膜6的另一個面6b上。 The laminated film 11 is a laminated film obtained by bonding the adhesive film 4 to the surface of the transparent conductive film 10 by the adhesive layer 2, and the adhesive film 4 is the surface protective film 5 for a transparent conductive film of the present invention. The peeling film 3 was peeled off. The transparent conductive film 10 is formed with a transparent conductive film 7 on one surface 6a of the resin film 6. The adhesive film 4 is attached to the other surface 6b of the resin film 6.

作為透明導電性膜10,可以舉出形成有ITO、AZO或GZO等的透明導電膜的聚對苯二甲酸乙二酯(PET)膜、形成有ITO、AZO或GZO等的透明導電膜的環狀聚烯烴膜等。這樣的透明導電性膜在觸控面板、電子紙、電磁波遮蔽材料、各種感測器、液晶面板、有機EL、太陽能電池等技術領域中廣泛用於透明電極等的形成用途。 Examples of the transparent conductive film 10 include a polyethylene terephthalate (PET) film in which a transparent conductive film such as ITO, AZO, or GZO is formed, and a ring in which a transparent conductive film such as ITO, AZO, or GZO is formed. Polyolefin film and the like. Such a transparent conductive film is widely used for forming a transparent electrode or the like in a technical field such as a touch panel, an electronic paper, an electromagnetic wave shielding material, various sensors, a liquid crystal panel, an organic EL, or a solar cell.

本發明的透明導電性膜用表面保護膜發揮如下的優異效果:在觸控面板等的透明電極的製程中,能夠大幅改善作業 性、生產效率,即使是薄型化的透明導電性膜,也不會使作業性、處理性降低。 The surface protective film for a transparent conductive film of the present invention exhibits an excellent effect of greatly improving the operation of a transparent electrode such as a touch panel. In terms of properties and production efficiency, even a thin transparent conductive film does not deteriorate workability and handleability.

另外,圖3為表示本發明的透明導電性膜用表面保護膜的製造方法的一例的示意圖。 In addition, FIG. 3 is a schematic view showing an example of a method for producing a surface protective film for a transparent conductive film of the present invention.

從進行了剝離處理的剝離膜3捲成的滾筒21和基材膜1捲成的滾筒22上分別反覆放出剝離膜3和基材膜1。在基材膜1的一個面上,利用黏合劑塗佈裝置23塗佈黏合劑。將塗佈有黏合劑的基材膜1在乾燥爐24中乾燥,形成黏合膜4。使黏合膜4的形成有黏合劑層的面與剝離膜3的進行了剝離處理的面相對,使用壓力滾輪25、26進行壓接,得到透明導電性膜用表面保護膜5。將透明導電性膜用表面保護膜5以滾筒27卷起。通常,透明導電性膜用表面保護膜5的保存、運輸以滾筒27的狀態進行。在貼合到透明導電性膜10上時,透明導電性膜用表面保護膜5從滾筒27上反繞。 The release film 3 and the base film 1 are repeatedly discharged from the roll 21 wound by the release film 3 subjected to the release treatment and the roll 22 wound by the base film 1. The adhesive is applied to one surface of the base film 1 by the adhesive coating device 23. The base film 1 coated with the adhesive is dried in a drying oven 24 to form an adhesive film 4. The surface of the adhesive film 4 on which the adhesive layer is formed is opposed to the surface of the release film 3 subjected to the release treatment, and is pressure-bonded by the pressure rollers 25 and 26 to obtain a surface protective film 5 for a transparent conductive film. The surface protective film 5 for a transparent conductive film is wound up on the drum 27. In general, the storage and transportation of the surface protective film 5 for a transparent conductive film are performed in the state of the drum 27. When bonded to the transparent conductive film 10, the surface protective film 5 for a transparent conductive film is rewinded from the drum 27.

【實施例】 [Examples]

以下,基於實施例進一步對本發明進行說明。 Hereinafter, the present invention will be further described based on examples.

(實施例1的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Example 1)

在厚度為25μm的雙軸延伸後的聚酯膜的單面上,通過梅爾棒法塗佈塗料,使乾燥後的聚矽氧烷膜的厚度為0.1μm,該塗料為將加成反應型聚矽氧烷(Toray Dow Corning製造,品名:SRX-211 100重量份中添加有鉑觸媒SRX-212 1重量份)用甲苯/乙酸乙酯1:1混合溶劑稀釋而得到的塗料。進而,在溫度120℃的熱風循環式烘箱中進行1分鐘的乾燥、固化,得到實施例1的剝離膜。 On one side of the biaxially stretched polyester film having a thickness of 25 μm, the coating was applied by a Myrtle method to make the thickness of the dried polyoxyalkylene film 0.1 μm, and the coating was an addition reaction type. Polysiloxane (manufactured by Toray Dow Corning, product name: SRX-211 100 parts by weight, 1 part by weight of platinum catalyst SRX-212) was diluted with a toluene/ethyl acetate 1:1 mixed solvent. Further, the film was dried and solidified in a hot air circulating oven at a temperature of 120 ° C for 1 minute to obtain a release film of Example 1.

另外,黏合劑層使用黏合劑組合物來形成,該黏 合劑組合物為在丙烯酸-2-乙基己酯與丙烯酸-2-羥乙酯共聚而成的固體含量為40%的丙烯酸類聚合物100重量份中添加HDI系交聯劑(日本聚氨酯工業公司製造,品名:CORONATEHX)4重量份、作為交聯觸媒的二月桂酸二丁基錫0.03重量份並混合而得到的黏合劑組合物。在厚度為125μm的聚對苯二甲酸乙二醇酯膜上塗佈上述黏合劑組合物,使乾燥後的黏合劑層的厚度為20μm,在溫度為130℃的熱風循環式烘箱中使黏合劑乾燥1分鐘。然後,將上述製作的實施例1的剝離膜的聚矽氧烷(silicone)處理面貼合疊層到黏合劑層的表面上,得到實施例1的透明導電性膜用表面保護膜。 In addition, the adhesive layer is formed using a binder composition, the adhesive The composition is a HDI-based crosslinking agent added to 100 parts by weight of an acrylic polymer having a solid content of 40% obtained by copolymerization of 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate (Japan Polyurethane Industry Co., Ltd.) A binder composition obtained by mixing and mixing 4 parts by weight of CORONATEHX) and 0.03 parts by weight of dibutyltin dilaurate as a crosslinking catalyst. The above adhesive composition was applied onto a polyethylene terephthalate film having a thickness of 125 μm so that the thickness of the dried adhesive layer was 20 μm, and the adhesive was applied in a hot air circulating oven at a temperature of 130 ° C. Dry for 1 minute. Then, the silicone-treated surface of the release film of Example 1 produced above was laminated and laminated on the surface of the adhesive layer to obtain a surface protective film for a transparent conductive film of Example 1.

(實施例2的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Example 2)

除了使交聯劑的添加量相對於丙烯酸類聚合物100重量份為6重量份以外,以與實施例1同樣的方式,得到實施例2的透明導電性膜用表面保護膜。 A surface protective film for a transparent conductive film of Example 2 was obtained in the same manner as in Example 1 except that the amount of the crosslinking agent added was 6 parts by weight based on 100 parts by weight of the acrylic polymer.

(實施例3的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Example 3)

除了使交聯劑的添加量相對於丙烯酸類聚合物100重量份為8重量份以外,以與實施例1同樣的方式,得到實施例3的透明導電性膜用表面保護膜。 A surface protective film for a transparent conductive film of Example 3 was obtained in the same manner as in Example 1 except that the amount of the crosslinking agent added was 8 parts by weight based on 100 parts by weight of the acrylic polymer.

(比較例1的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Comparative Example 1)

除了使黏合劑層的乾燥溫度為100℃以外,以與實施例1同樣的方式,得到比較例1的透明導電性膜用表面保護膜。 A surface protective film for a transparent conductive film of Comparative Example 1 was obtained in the same manner as in Example 1 except that the drying temperature of the adhesive layer was changed to 100 °C.

(比較例2的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Comparative Example 2)

除了使用在丙烯酸丁酯、丙烯酸-2-乙基己酯與丙烯酸共聚 而成的固體含量為40%的丙烯酸類聚合物100重量份中添加環氧系交聯劑(三菱瓦斯化學公司製造,品名:TETRAD-C)4重量份並混合而得到的黏合劑組合物作為黏合劑組合物以外,以與實施例1同樣的方式,得到比較例2的透明導電性膜用表面保護膜。 In addition to the use of butyl acrylate, 2-ethylhexyl acrylate and acrylic acid copolymerization A binder composition obtained by adding 4 parts by weight of an epoxy-based crosslinking agent (trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.) to 100 parts by weight of the acrylic polymer having a solid content of 40% was used as a binder composition. A surface protective film for a transparent conductive film of Comparative Example 2 was obtained in the same manner as in Example 1 except for the binder composition.

(比較例3的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Comparative Example 3)

除了使用在丙烯酸-2-乙基己酯、丙烯酸丁酯與丙烯酸-2-羥乙酯共聚而成的固體含量為40%的丙烯酸類聚合物100重量份中添加HDI系交聯劑(日本聚氨酯工業公司製造,品名:CORONATE HX)1重量份、作為交聯觸媒的二月桂酸二丁基錫0.03重量份並混合而得到的黏合劑組合物作為黏合劑組合物以外,以與實施例1同樣的方式,得到比較例3的透明導電性膜用表面保護膜。 In addition to using 100 parts by weight of an acrylic polymer having a solid content of 40% copolymerized with 2-ethylhexyl acrylate, butyl acrylate and 2-hydroxyethyl acrylate, an HDI crosslinking agent (Japanese polyurethane) is added. The adhesive composition obtained by the industrial company, the product name: CORONATE HX), and the binder composition obtained by mixing and mixing 0.03 part by weight of dibutyltin dilaurate as a crosslinking catalyst as a binder composition, the same as in the first embodiment. In the manner of obtaining a surface protective film for a transparent conductive film of Comparative Example 3.

(比較例4的透明導電性膜用表面保護膜的製作) (Production of Surface Protective Film for Transparent Conductive Film of Comparative Example 4)

除了不添加作為交聯觸媒的二月桂酸二丁基錫以外,以與實施例1同樣的方式,得到比較例4的透明導電性膜用表面保護膜。 A surface protective film for a transparent conductive film of Comparative Example 4 was obtained in the same manner as in Example 1 except that dibutyltin dilaurate as a crosslinking catalyst was not added.

以下,示出評價試驗的方法和試驗結果。此處, 使用「硬塗佈處理PET膜」作為透明導電性薄膜用基材(膜)的一例。 Hereinafter, the method and test results of the evaluation test are shown. Here, The "hard coating-treated PET film" is used as an example of a substrate (film) for a transparent conductive film.

(儲存模數的測定) (Measurement of storage modulus)

對於實施例、比較例中得到的樣品,使用粘彈性測定裝置(ABM公司製造,動態黏彈性測定裝置Reogel-E4000)測定在40℃環境下熟化5天後的黏合劑層在30℃下的儲存模數。 For the samples obtained in the examples and the comparative examples, the viscoelasticity measuring apparatus (manufactured by ABM, dynamic viscoelasticity measuring apparatus Reogel-E4000) was used to measure the storage of the adhesive layer after curing for 5 days at 40 ° C for 30 days. Modulus.

(對PET膜的黏合力的測定) (Measurement of adhesion to PET film)

對於實施例、比較例中得到的樣品,測定黏合劑層的乾燥開始15分鐘後和在40℃的環境下熟化5天後的黏合劑層對PET膜的黏合力。 For the samples obtained in the examples and the comparative examples, the adhesion of the adhesive layer to the PET film after 15 minutes from the start of drying of the adhesive layer and after aging for 5 days in an environment of 40 ° C was measured.

通過使2kg的橡膠滾筒往返一次將樣品貼合到厚度為38μm的雙軸延伸聚對苯二甲酸乙二酯膜(三菱樹脂株式會社製造,DIA FOIL T100)上。在23℃、50%RH的環境下放置1小時後,使用小型桌上型試驗裝置(島津製作所公司製造,EZ-L),測定以300mm/分鐘的剝離速度沿180°的方向剝離PET膜時的黏合力。 The sample was attached to a biaxially stretched polyethylene terephthalate film (manufactured by Mitsubishi Plastics, Inc., DIA FOIL T100) having a thickness of 38 μm by reciprocating a 2 kg rubber roller. After being allowed to stand in an environment of 23° C. and 50% RH for 1 hour, the PET film was peeled off in a direction of 180° at a peeling speed of 300 mm/min using a small table type test apparatus (EZ-L, manufactured by Shimadzu Corporation). Adhesion.

(透明導電性膜用表面保護膜的初始黏合力的測 定) (Measurement of initial adhesion of surface protective film for transparent conductive film set)

使用在厚度為50μm的雙軸延伸後的聚酯膜的單面上實施了硬塗佈處理的、也用於ITO膜的硬塗佈處理後的PET膜(KIMOTO公司製造,品名:KB膜#50G01)。將裁切為25mm寬的透明導電性膜用表面保護膜貼合到PET膜的實施了硬塗佈處理的表面上後,在23℃、50%RH的環境下保存1小時,製成初始黏合力的測定樣品。然後,使用拉伸試驗機,測定以300mm/分鐘的剝離速度沿180°的方向剝離透明導電性膜用表面保護膜時的強度,將其作為初始黏合力(N/25mm)。 A PET film which was subjected to a hard coating treatment on a single surface of a biaxially stretched polyester film having a thickness of 50 μm and which was also used for hard coating treatment of an ITO film (manufactured by KIMOTO Co., Ltd., product name: KB film # 50G01). The transparent conductive film cut into a 25 mm-wide transparent conductive film was bonded to the surface of the PET film subjected to the hard coating treatment, and then stored in an environment of 23 ° C and 50% RH for 1 hour to prepare an initial bond. The sample of the force is measured. Then, the strength at the time of peeling the surface protective film for transparent conductive films in the direction of 180 degrees at a peeling speed of 300 mm/min was measured using a tensile tester, and this was made into the initial adhesive force (N / 25 mm).

測定裝置使用島津製作所公司製造的型號為EZ-L的小型桌上型試驗裝置。 As the measuring device, a small desktop type test device model EZ-L manufactured by Shimadzu Corporation was used.

<透明導電性膜用表面保護膜的加熱後黏合力的測定> <Measurement of Adhesive Strength After Heating of Surface Protective Film for Transparent Conductive Film>

將裁切為25mm寬的透明導電性膜用表面保護膜貼合到PET膜的實施了硬塗佈處理的表面上後,在150℃環境下保存1小時,作為加熱後黏合力的測定樣品,除此以外,與初始黏合力的測定同樣地測定,將其作為加熱後黏合力(N/25mm)。 The surface of the transparent conductive film cut into a 25 mm-thick transparent conductive film was bonded to the surface of the PET film subjected to the hard coating treatment, and then stored in a 150 ° C environment for 1 hour as a measurement sample for the adhesive force after heating. Except for this, it was measured in the same manner as the measurement of the initial adhesive force, and this was used as a post-heating adhesive force (N/25 mm).

測定裝置使用島津製作所公司製造的型號為EZ-L的小型桌上型試驗裝置。 As the measuring device, a small desktop type test device model EZ-L manufactured by Shimadzu Corporation was used.

(在硬塗佈處理PET膜上貼合透明導電性膜用表面保護膜時的處理性的確認方法) (Method for confirming the handleability when a surface protective film for a transparent conductive film is bonded to a hard coating-treated PET film)

使用對透明導電性膜用表面保護膜進行了外觀檢查的樣品作為下述的透明導電性膜用表面保護膜。在硬塗佈處理後的PET膜(KIMOTO公司製造,品名:KB膜#50G01)的硬塗佈處理面上貼合透明導電性膜用表面保護膜,然後將疊層品切割為A4尺寸。拿住切割得到的樣品的4個角中的1個角,以膜面在空中扇動的方式前後往返振動20次。然後,通過目視確認硬塗佈處理PET膜有無彎折、變形。將硬塗佈處理PET膜上沒有彎折、變形的樣品評價為(○),將存在彎折或變形的樣品評價為(×)。 A sample subjected to visual inspection of the surface protective film for a transparent conductive film was used as the surface protective film for a transparent conductive film described below. The surface protective film for a transparent conductive film was bonded to the hard-coated surface of the PET film (KIMOTO Co., Ltd., product name: KB film #50G01) after the hard coating process, and the laminated product was cut into the A4 size. One of the four corners of the cut sample was taken and vibrated back and forth 20 times in such a manner that the film surface was fanned in the air. Then, it was confirmed by visual observation whether or not the PET film of the hard coating treatment was bent or deformed. The sample which was not bent and deformed on the hard-coated PET film was evaluated as (○), and the sample which was bent or deformed was evaluated as (×).

(透明導電性膜用表面保護膜的外觀檢查的方法) (Method of visual inspection of surface protective film for transparent conductive film)

使用測試塗佈機製作透明導電性膜用表面保護膜的捲筒品(400mm寬×100m/卷),在40℃的烘箱中保溫5天,進行黏合劑的熟化。然後,通過目測對從捲筒品反繞後的透明導電性膜用表面保護膜的距邊緣50m的部位(距兩端大致等距離的位置)的樣品的外觀進行觀察。將黏合劑層的表面平滑的樣品評價為(○),將在黏合劑層的表面產生了弱凹凸的樣品評價為(△),將在黏合劑層的表面產生了強凹凸的樣品評價為(×)。 A roll of a surface protective film for a transparent conductive film (400 mm width × 100 m/volume) was produced by a test coater, and the mixture was kept in an oven at 40 ° C for 5 days to cure the adhesive. Then, the appearance of the sample of the surface protective film for the transparent conductive film after the rewinding of the roll product from the edge 50 m from the edge (a position equidistant from both ends) was observed by visual observation. The sample having a smooth surface of the adhesive layer was evaluated as (○), and a sample having weak unevenness on the surface of the adhesive layer was evaluated as (Δ), and a sample having strong unevenness on the surface of the adhesive layer was evaluated as ( ×).

(硬塗佈處理膜的外觀檢查的方法) (Method of visual inspection of hard coating film)

使用對透明導電性膜用表面保護膜進行了外觀檢查的樣品作為下述的透明導電性膜用表面保護膜。在硬塗佈處理PET膜(KIMOTO公司製造,品名:KB膜#50G01)的硬塗佈處理面上貼合透明導電性膜用表面保護膜,然後,在150℃下進行1小時的加熱處理。將透明導電性膜用表面保護膜剝離後,通過目測觀察硬塗佈處理PET膜的表面狀態。將硬塗佈處理PET膜的外觀平滑的樣品評價為(○),將產生了凹凸狀弱變形的樣品評價為(△),將產生了凹凸狀強變形的樣品評價為(×)。 A sample subjected to visual inspection of the surface protective film for a transparent conductive film was used as the surface protective film for a transparent conductive film described below. The surface protective film for transparent conductive films was bonded to the hard-coated surface of the hard-coated PET film (KIMOTO Co., Ltd., product name: KB film #50G01), and then heat-treated at 150 ° C for 1 hour. After the surface protective film for the transparent conductive film was peeled off, the surface state of the hard coating-treated PET film was visually observed. The sample having a smooth appearance of the hard-coated PET film was evaluated as (○), the sample having the uneven deformation of the uneven shape was evaluated as (Δ), and the sample having the uneven deformation was evaluated as (×).

將針對各個樣品的測定結果示於表1。表1中,「聚 合物A」為實施例1中記載的丙烯酸類聚合物,「聚合物B」為比較例2中記載的丙烯酸類聚合物,「聚合物C」為比較例3中記載的丙烯酸類聚合物,「交聯劑1」為實施例1和比較例3中記載的HDI系交聯劑,「交聯劑2」為比較例2中記載的環氧類交聯劑。另外,關於表1中的儲存模數的值,通過在E的前後記載尾數和指數的形式來表示,例如將4.0×105記為4.0E+05。 The measurement results for each sample are shown in Table 1. In Table 1, "Polymer A" is the acrylic polymer described in Example 1, "Polymer B" is the acrylic polymer described in Comparative Example 2, and "Polymer C" is described in Comparative Example 3. The acrylic polymer, "crosslinking agent 1" is the HDI crosslinking agent described in Example 1 and Comparative Example 3, and the "crosslinking agent 2" is the epoxy crosslinking agent described in Comparative Example 2. Further, the value of the storage modulus in Table 1 is expressed by the form of the mantissa and the index before and after E, and for example, 4.0 × 10 5 is recorded as 4.0E+05.

由表1所示的測定結果作出如下判斷。 From the measurement results shown in Table 1, the following judgments were made.

實施例1~2中,透明導電性膜用表面保護膜中使用的黏合劑層的、“黏合劑層的乾燥開始15分鐘後與在40℃下老化5天後對PET膜的黏合力的比例”(a/b)為1.4~1.6,乾燥開始15分鐘後與老化(熟化)完成後的黏合力的變化小,且黏合劑層表面的凹凸非常小。使用了該表面保護膜的硬塗佈處理PET膜的外觀良好。另外,將實施例1~2的透明導電性膜用表面保護膜貼合到硬塗佈處理PET膜上時的處理性也非常良好。 In the adhesive layers used for the surface protective film for transparent conductive films in Examples 1 and 2, the ratio of the adhesive force to the PET film after 15 minutes from the start of drying of the adhesive layer and after aging at 40 ° C for 5 days "(a/b) is 1.4 to 1.6, and the change in the adhesive force after completion of aging (aging) after 15 minutes from the start of drying is small, and the unevenness on the surface of the adhesive layer is extremely small. The hard coating-treated PET film using the surface protective film had a good appearance. In addition, the handleability when the surface protective film for transparent conductive films of Examples 1-2 was bonded to the hard-coating PET film was also excellent.

關於實施例3,“黏合劑層的乾燥開始15分鐘後與在40℃下老化5天後對PET膜的黏合力的比例”(a/b)為2.0,與實施例1~2相比,黏合劑層表面的凹凸稍稍增大,但黏合劑層表面的凹凸形狀不會轉印到硬塗佈處理PET膜上,得到了外觀良好的硬塗佈處理PET膜。 With respect to Example 3, "the ratio of the adhesive force to the PET film after 15 minutes from the start of drying of the adhesive layer to the temperature at 40 ° C for 5 days" (a/b) was 2.0, which was compared with Examples 1 and 2. The unevenness on the surface of the adhesive layer was slightly increased, but the uneven shape on the surface of the adhesive layer was not transferred to the hard-coated PET film, and a hard-coated PET film having a good appearance was obtained.

另一方面,對於比較例1~2,「黏合劑層的乾燥開 始15分鐘後與在40℃下老化5天後對PET膜的黏合力的比例」(a/b)為2.3~8.5,透明導電性膜用表面保護膜在黏合劑層的表面產生了凹凸。因此,在對與硬塗佈處理PET膜貼合而成的疊層品進行加熱處理時,黏合劑層的表面的凹凸形狀轉印到硬塗 佈處理PET膜上,硬塗佈處理PET膜的外觀下降。 On the other hand, for Comparative Examples 1 and 2, "the dryness of the adhesive layer was opened. After the first 15 minutes, the ratio of the adhesion to the PET film after the aging for 5 days at 40 ° C (a/b) was 2.3 to 8.5, and the surface protective film for the transparent conductive film was uneven on the surface of the adhesive layer. Therefore, when the laminate which is bonded to the hard coating-treated PET film is subjected to heat treatment, the uneven shape of the surface of the adhesive layer is transferred to the hard coat layer. On the cloth treated PET film, the appearance of the hard coating treated PET film was lowered.

另外,比較例3中,黏合劑層的儲存模數低至小於4.0×105Pa,「黏合劑層的乾燥開始15分鐘後與在40℃下老化5天後對PET膜的黏合力的比例」(a/b)為1.5。但是,比較例3的透明導電性膜用表面保護膜在黏合劑層的表面產生了凹凸。因此,在對與硬塗佈處理PET膜貼合而成的疊層品進行加熱處理時,黏合劑層的表面的凹凸形狀轉印到硬塗佈處理PET膜上,硬塗佈處理PET膜的外觀下降。 Further, in Comparative Example 3, the storage modulus of the adhesive layer was as low as less than 4.0 × 10 5 Pa, and the ratio of the adhesion to the PET film after 15 minutes from the start of drying of the adhesive layer and after aging at 40 ° C for 5 days. (a/b) is 1.5. However, the surface protective film for a transparent conductive film of Comparative Example 3 produced irregularities on the surface of the adhesive layer. Therefore, when heat-treating the laminated product bonded to the hard-coated PET film, the uneven shape of the surface of the adhesive layer is transferred to the hard-coated PET film, and the PET film is hard-coated. The appearance is declining.

對於未添加交聯觸媒的比較例4,在黏合劑層的乾燥開始15分鐘後對PET膜的黏合力評價中,黏合劑層發生凝聚破壞,透明導電性膜用表面保護膜在黏合劑層的表面產生了凹凸。因此,在對硬塗佈處理PET膜貼合而成的疊層品進行加熱處理時,黏合劑層的表面的凹凸形狀轉印到硬塗佈處理PET膜上,硬塗佈處理PET膜的外觀下降。 In Comparative Example 4 in which no crosslinking catalyst was added, the adhesion of the adhesive layer was evaluated in the adhesion of the PET film 15 minutes after the start of drying of the adhesive layer, and the surface protective film for the transparent conductive film was on the adhesive layer. The surface produces bumps. Therefore, when the laminate obtained by laminating the hard-coated PET film is subjected to heat treatment, the uneven shape of the surface of the adhesive layer is transferred onto the hard-coated PET film, and the appearance of the hard-coated PET film is applied. decline.

【產業實用性】 [Industrial Applicability]

本發明的透明導電性膜用表面保護膜在觸控面板用的透明電極的製程中,即使在貼合到薄型化的透明導電性膜上的狀態下經過加熱製程後,產生的捲曲也非常小。由此,能夠大幅改善觸控面板用透明電極的製程的作業性、生產效率。另外,本發明的透明導電性膜用表面保護膜能夠作為在觸控面板、電子紙、電磁波遮蔽材料、各種感測器、液晶面板、有機EL、太陽能電池等技術領域中使用的、透明導電性膜的製造、加工用表面保護膜廣泛使用。 In the process for producing a transparent electrode for a touch panel, the surface protective film for a transparent conductive film of the present invention has a very small curl even after being subjected to a heating process in a state of being bonded to a thin transparent conductive film. . Thereby, the workability and production efficiency of the process of the transparent electrode for touch panels can be greatly improved. Further, the surface protective film for a transparent conductive film of the present invention can be used as a transparent conductive material in the technical fields of touch panels, electronic paper, electromagnetic wave shielding materials, various sensors, liquid crystal panels, organic EL, solar cells, and the like. A surface protective film for the production and processing of a film is widely used.

1‧‧‧基材膜 1‧‧‧Base film

2‧‧‧黏合劑層 2‧‧‧Binder layer

3‧‧‧剝離膜 3‧‧‧Release film

4‧‧‧黏合膜 4‧‧‧Adhesive film

5‧‧‧用於透明導電性薄膜的表面保護膜 5‧‧‧Surface protection film for transparent conductive film

Claims (2)

一種透明導電性膜用表面保護膜,其使用於貼合到在一個面上形成有透明導電膜的樹脂膜的另一個面上,其特徵在於:該透明導電性膜用表面保護膜在基材膜的單面上使用含有丙烯酸類樹脂組合物、交聯劑和交聯催化劑的丙烯酸類黏合劑疊層黏合劑層而成,該黏合劑層在30℃下的儲存模數為4.0×105Pa以上,且該黏合劑層的乾燥開始15分鐘後的該黏合劑層對PET膜的黏合力與在40℃下老化5天後的該黏合劑層對PET膜的黏合力滿足下式(1)的關係: 其中,a為該黏合劑層的乾燥開始15分鐘後的該黏合劑層對PET膜的黏合力,b為在40℃老化5天後的該黏合劑層對PET膜的黏合力。 A surface protective film for a transparent conductive film, which is used for bonding to a surface of a resin film having a transparent conductive film formed on one surface thereof, characterized in that the surface protective film for the transparent conductive film is on a substrate The adhesive layer of the acrylic adhesive layer containing the acrylic resin composition, the crosslinking agent and the crosslinking catalyst is laminated on one side of the film, and the storage modulus of the adhesive layer at 30 ° C is 4.0 × 10 5 Above Pa, and the adhesion of the adhesive layer to the PET film after 15 minutes from the start of drying of the adhesive layer and the adhesion of the adhesive layer to the PET film after aging for 5 days at 40 ° C satisfy the following formula (1) )Relationship: Where a is the adhesion of the adhesive layer to the PET film 15 minutes after the start of drying of the adhesive layer, and b is the adhesion of the adhesive layer to the PET film after aging at 40 ° C for 5 days. 一種透明導電性膜,其為將如申請專利範圍第1項所述之透明導電性膜用表面保護膜貼合到在一個面上形成有透明導電膜的樹脂膜的另一個面上得到的透明導電性膜。 A transparent conductive film obtained by laminating a surface protective film for a transparent conductive film according to claim 1 of the invention to the other surface of a resin film having a transparent conductive film formed on one surface thereof Conductive film.
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TWI681032B (en) 2020-01-01
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KR101837940B1 (en) 2018-03-13
KR20170081633A (en) 2017-07-12

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