WO2014156889A1 - 積層フィルム及びそのフィルムロール、並びにそれから得られうる光透過性導電性フィルム及びそれを利用したタッチパネル - Google Patents

積層フィルム及びそのフィルムロール、並びにそれから得られうる光透過性導電性フィルム及びそれを利用したタッチパネル Download PDF

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Publication number
WO2014156889A1
WO2014156889A1 PCT/JP2014/057551 JP2014057551W WO2014156889A1 WO 2014156889 A1 WO2014156889 A1 WO 2014156889A1 JP 2014057551 W JP2014057551 W JP 2014057551W WO 2014156889 A1 WO2014156889 A1 WO 2014156889A1
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WIPO (PCT)
Prior art keywords
film
light
layer
light transmissive
transmitting
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PCT/JP2014/057551
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English (en)
French (fr)
Japanese (ja)
Inventor
勝紀 武藤
潤也 紅林
中谷　康弘
林　秀樹
Original Assignee
積水ナノコートテクノロジー株式会社
積水化学工業株式会社
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Application filed by 積水ナノコートテクノロジー株式会社, 積水化学工業株式会社 filed Critical 積水ナノコートテクノロジー株式会社
Priority to KR1020157004289A priority Critical patent/KR101554847B1/ko
Priority to CN201480002169.9A priority patent/CN104718582B/zh
Publication of WO2014156889A1 publication Critical patent/WO2014156889A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Definitions

  • the present invention relates to a laminated film, a film roll thereof, a light-transmitting conductive film obtainable therefrom, and a touch panel using the same.
  • Light transmissive conductive film obtained by laminating a light transmissive conductive layer made of indium tin oxide (ITO) or the like on a light transmissive support layer made of PET or the like as a light transmissive conductive film mounted on a touch panel. Many films are used. In this light-transmitting conductive film, the light-transmitting conductive layer is usually disposed so as to be the outermost layer. This light-transmitting conductive film is once wound up as a film roll after being manufactured and then transported from the manufacturing site to the next destination, where it is rewound at the destination to obtain a film state for further processing. Usually made or used.
  • a so-called protective film is stuck on the surface of the light-transmitting conductive film opposite to the light-transmitting conductive layer, and a laminated film (Patent Document 1).
  • a laminated film wound up as a film roll, the surfaces of the light-transmitting conductive layer and the protective film are adjacent to each other.
  • the light-transmitting conductive film is sometimes used after forming a light-transmitting conductive layer as a grid-like electrode (so-called patterning).
  • the patterning of the light-transmitting conductive layer is a so-called etching process in which a region that is not desired to be removed is protected by a protective film called an etching resist and then chemical treatment is performed, and only the unprotected region is removed from the light-transmitting conductive layer. Is done.
  • This etching process is performed after the film roll formed by winding the above-described laminated film is rewound into a film state. Specifically, the treatment with an etching resist and the treatment with an etching solution are sequentially performed in a film state.
  • This laminated film is finally used for applications such as mounting on a touch panel as a light-transmitting conductive film after peeling off the protective film.
  • the etching resist film is on the protective film side.
  • the present inventors have found that there is a problem of adhering to the surface. If such an etching resist film adheres to the protective film side, problems such as difficulty in finding appearance defects and the like occur in subsequent processes, which is not preferable.
  • An object of the present invention is to provide a laminated film in which an etching resist film is difficult to adhere to the surface on the protective film side after the etching resist is removed.
  • the present invention is as follows.
  • Item 1 (A) a light transmissive conductive film; and (B) a protective film
  • the light-transmitting conductive film (A) is (A-1) a light transmissive support layer; and (A-2) one or more light transmissive conductive layers, and at least one outermost layer is one light transmissive conductive layer (A-2).
  • a light transmissive conductive film comprising: At least one of the light transmissive conductive layers (A-2) as the outermost layer of the light transmissive conductive film (A) is disposed on one surface of the laminated film, The protective film (B) is disposed on the other surface of the laminated film, and the contact angle with respect to water of the surface on the protective film (B) side is 70 ° or more, and the laminated film .
  • Item 2 The laminated film according to Item 1, wherein the Haze value is 5% or less.
  • Item 3. The laminated film according to Item 1 or 2, wherein the light transmissive conductive layer (A-2) contains indium tin oxide.
  • Item 4. A film roll obtained by winding up the laminated film according to any one of Items 1 to 3.
  • Item 4. A light-transmitting conductive film obtainable by a method comprising a step of obtaining a light-transmitting conductive film (A) by peeling the protective film (B) from the laminated film according to any one of Items 1 to 3. .
  • Item 6. A touch panel comprising the light transmissive conductive film according to Item 5.
  • the present invention it is possible to reduce the amount of the etching resist film adhering to the surface on the protective film side after performing the etching treatment.
  • the laminate of the present invention comprising a light-transmitting conductive film (A) having a light-transmitting conductive layer (A-2) disposed on one side of the light-transmitting support layer (A-1), and a protective film (B). It is sectional drawing which shows a film.
  • the laminate of the present invention comprising a light-transmitting conductive film (A) having a light-transmitting conductive layer (A-2) disposed on both sides of a light-transmitting support layer (A-1), and a protective film (B) It is sectional drawing which shows a film.
  • FIG. 3 is a cross-sectional view showing a laminated film of the present invention comprising a protective film (B) having an adhesive layer (B-2) disposed on one side of the protective layer (B-1).
  • a light transmissive conductive layer (A-2), a light transmissive underlayer (A-3), and a hard coat layer (A-4) are further provided on one surface of the light transmissive support layer (A-1).
  • A-2) having a light transmissive conductive layer (A-2) disposed on one side of the light transmissive support layer (A-1); and an oligomer on one side of the protective layer (B-1).
  • the laminated film of the present invention is a film having a configuration in which two or more films are laminated, (A) a light transmissive conductive film; (B) Contains a protective film.
  • the light transmissive conductive film (A) is: (A-1) a light transmissive support layer; and (A-2) a light transmissive conductive layer; Each containing one or more At least one outermost layer is configured as one light-transmissive conductive layer (A-2). That is, the light transmissive conductive film (A) may contain two or more light transmissive conductive layers (A-2).
  • the light transmissive conductive film (A) One light-transmitting conductive layer (A-2) may be disposed so as to be the outermost layer on one surface of the light-transmitting support layer (A-1), and another light-transmitting conductive layer ( A-2) may be disposed on the other surface of the light-transmissive support layer (A-1). In the latter case, the further light transmissive conductive layer (A-2) may be disposed on the other surface of the light transmissive support layer (A-1) so as to be the outermost layer.
  • the laminated film of the present invention at least one of the light transmissive conductive layers (A-2) disposed in the outermost layer of the light transmissive conductive film (A) is formed on one surface of the laminated film (“light transmissive”).
  • the protective film (B) is disposed on the conductive conductive layer (A-2) side) and the protective film (B) is the other surface of the laminated film (the “protective film (B) side surface”) Is located).
  • the light-transmitting conductive layer (A-2) and the protective film (B) may be disposed on the surface, respectively.
  • the light-transmitting conductive film (A) and the protective film (B) Other structures such as another film may be interposed therebetween.
  • any light transmissive The conductive conductive layer (A-2) may be disposed on the surface of the laminated film.
  • the surface on the protective film (B) side of the laminated film of the present invention has a contact angle with water of 70 ° or more.
  • FIG. 1 shows an embodiment of the laminated film of the present invention.
  • the light transmissive conductive film (A-2) is directly (that is, adjacent) to one surface of the light transmissive support layer (A-1).
  • the arrangement is arranged.
  • the light transmissive conductive layer (A-2) is the outermost layer of the surface of the light transmissive support layer (A-1).
  • the light transmissive conductive layer (A-2) is disposed on one surface of the laminated film, and the protective film (B) is disposed on the other surface of the laminated film.
  • FIG. 2 shows another aspect of the laminated film of the present invention.
  • the light transmissive conductive film has a configuration in which the light transmissive conductive layer (A-2) is directly disposed on both sides of the light transmissive support layer (A-1).
  • the two light transmissive conductive layers (A-2) are the outermost layers on both surfaces of the light transmissive support layer (A-1).
  • one arbitrary light-transmissive conductive layer (A-2) is disposed on one surface of the laminated film, and the protective film (B) is disposed on the other surface of the laminated film.
  • Light transmissive conductive film A
  • “light-transmitting” means having a property of transmitting light (translucent).
  • “Light transmissivity” includes transparency.
  • “Light transmissivity” means, for example, the property that the total light transmittance is 80% or more, preferably 85% or more, more preferably 88% or more. In the present invention, the total light transmittance is measured based on JIS-K-7105 using a haze meter (trade name: NDH-2000 manufactured by Nippon Denshoku Co., Ltd. or equivalent).
  • the thickness of each layer is determined using a commercially available reflection spectral film thickness meter (Otsuka Electronics, FE-3000 (product name), or equivalent). Alternatively, it may be obtained by observation using a commercially available transmission electron microscope. Specifically, a film to be measured is thinly cut in a direction perpendicular to the film surface using a microtome or a focused ion beam, and the cross section is observed.
  • a reflection spectral film thickness meter Otsuka Electronics, FE-3000 (product name), or equivalent.
  • the light transmissive support layer (A ⁇ ) when referring to the relative positional relationship between two layers among a plurality of layers arranged on one surface of the light transmissive support layer (A-1), the light transmissive support layer (A ⁇ ) is referred to.
  • the light transmissive support layer (A ⁇ ) On the basis of 1), one layer having a large distance from the light transmissive support layer (A-1) may be referred to as an “upper” layer or the like.
  • the light-transmitting support layer refers to a light-transmitting conductive film containing a light-transmitting conductive layer that plays a role of supporting a layer including the light-transmitting conductive layer.
  • the light transmissive support layer (A-1) is not particularly limited.
  • a conductive film for a touch panel that is normally used as a light transmissive support layer can be used.
  • the material for the light transmissive support layer (A-1) is not particularly limited, and examples thereof include various organic polymers.
  • the organic polymer is not particularly limited.
  • examples thereof include resins, polyamide resins, polyvinyl chloride resins, polyacetal resins, polyvinylidene chloride resins, and polyphenylene sulfide resins.
  • polyester-type resin For example, a polyethylene terephthalate (PET), a polyethylene naphthalate (PEN), etc. are mentioned.
  • the material of the light transmissive support layer (A-1) is preferably a polyester resin, and particularly preferably PET.
  • the light transmissive support layer (A-1) may be composed of any one of them, or may be composed of a plurality of types. Further, a plurality of light-transmitting support layers may be bonded with an adhesive or the like. When a plurality of light-transmitting support layers are used, a plurality of the same types may be used, or a plurality of types may be used.
  • the thickness of the light transmissive support layer (A-1) is not particularly limited, and examples thereof include a range of 2 to 300 ⁇ m.
  • Light transmissive conductive layer (A-2) In the laminated film of the present invention, at least one light transmissive conductive layer (A-2) is directly or via one or more other layers on at least one surface of the light transmissive support layer (A-1). Are arranged to be the outermost layer.
  • the light-transmitting conductive layer (A-2) may be disposed at least one layer on each side of the light-transmitting support layer (A-1).
  • the light-transmitting conductive layer means a layer containing a conductive substance, conducting electricity and transmitting visible light.
  • the light-transmitting conductive layer (A-2) is not particularly limited, and for example, a layer normally used as a light-transmitting conductive layer in a conductive film for a touch panel can be used.
  • the material of the light transmissive conductive layer (A-2) is not particularly limited, and examples thereof include indium oxide, zinc oxide, tin oxide, and titanium oxide.
  • the light transmissive conductive layer (A-2) is preferably a light transmissive conductive layer containing indium oxide doped with a dopant in terms of achieving both transparency and conductivity.
  • the light transmissive conductive layer (A-2) may be a light transmissive conductive layer made of indium oxide doped with a dopant. Although it does not specifically limit as a dopant, For example, a tin oxide, a zinc oxide, those mixtures, etc. are mentioned.
  • indium oxide doped with tin oxide is used as the material of the light transmissive conductive layer (A-2), indium (III) oxide (In 2 O 3 ) is doped with tin (IV) oxide (SnO 2 ).
  • Tin-doped indium oxide; ITO is preferred.
  • the addition amount of SnO 2 is not particularly limited, and examples thereof include 1 to 15% by weight, preferably 2 to 10% by weight, and more preferably 3 to 8% by weight.
  • a material in which another dopant is added to indium tin oxide within a range where the total amount of dopant does not exceed the numerical range shown on the left may be used as a material for the light transmissive conductive layer (A-2). Although it does not specifically limit as another dopant in the left, For example, selenium etc. are mentioned.
  • the light transmissive conductive layer (A-2) may be composed of any one of the various materials described above, or may be composed of a plurality of types.
  • the light transmissive conductive layer (A-2) is not particularly limited, but may be a crystalline or amorphous body, or a mixture thereof.
  • the thickness of the light transmissive conductive layer (A-2) is not particularly limited, but is usually 5 to 50 nm.
  • the thickness of the light transmissive conductive layer (A-2) is preferably 10 to 40 nm, more preferably 12 to 35 nm, and still more preferably 15 to 30 nm.
  • the method for disposing the light transmissive conductive layer (A-2) may be either wet or dry, and is not particularly limited.
  • Specific examples of the method for disposing the light transmissive conductive layer (A-2) include, for example, a sputtering method, a vacuum deposition method, an ion plating method, a CVD method, and a pulse laser deposition method.
  • a method including a step of baking a conductive substance is preferable.
  • a baking method For example, the drum heating at the time of performing sputtering etc., a hot-air type baking furnace, a far-infrared baking furnace, etc. can be mentioned as an example.
  • the firing temperature is not particularly limited, but is usually 30 to 250 ° C., preferably 50 to 200 ° C., more preferably 80 to 180 ° C., and further preferably 100 to 160 ° C.
  • the firing time is preferably 3 minutes to 180 minutes, more preferably 5 minutes to 120 minutes, and even more preferably 10 minutes to 90 minutes.
  • the atmosphere for performing firing include air, an inert gas such as nitrogen or argon, oxygen, hydrogenated nitrogen, or a combination of two or more of these under vacuum.
  • the light transmissive conductive film (A) further contains a light transmissive underlayer (A-3), and at least one light transmissive conductive layer (A-2) is at least a light transmissive underlayer (A). -3) may be disposed on the surface of the light transmissive support layer (A-1).
  • the light transmissive conductive layer (A-2) may be disposed adjacent to the light transmissive underlayer (A-3).
  • FIG. 3 shows one embodiment of the laminated film of the present invention.
  • the light transmissive underlayer (A-3) is disposed directly on one surface of the light transmissive support layer (A-1).
  • the light transmissive underlayer (A-3) is disposed via the transmissive underlayer (A-3).
  • Other configurations are the same as those in FIG. 5 described later.
  • the material of the light transmissive underlayer (A-3) is not particularly limited, but may be, for example, a dielectric material.
  • the material for the light-transmitting underlayer (A-3) is not particularly limited. Examples include oxane, polysilazane, and acrylic silica hybrid.
  • the light transmissive underlayer (A-3) may be composed of any one of them, or may be composed of a plurality of types.
  • As the light transmissive underlayer (A-3), a light transmissive underlayer containing SiO x (x 1.0 to 2.0) is preferable.
  • One layer of the light-transmitting underlayer (A-3) may be disposed.
  • two or more layers may be arranged adjacent to each other or separated from each other via other layers.
  • Two or more light-transmitting underlayers (A-3) are preferably arranged adjacent to each other. Examples of such embodiments include, for example, stacking composed of adjacent SiO 2 layers and SiO x layers, and stacking composed of adjacent SiO 2 layers and SiO x N y layers.
  • the order of the SiO 2 layer and the SiO x layer is arbitrary, but the light transmissive underlayer made of SiO 2 on the light transmissive support layer (A-1) side (B-2)
  • the thickness per layer of the light-transmitting underlayer (A-3) is not particularly limited, and examples thereof include 15 to 25 nm. When two or more layers are disposed adjacent to each other, the total thickness of all the light-transmitting underlayers (A-3) adjacent to each other may be within the above range.
  • the refractive index of the light-transmitting underlayer (A-3) is not particularly limited as long as the light-transmitting conductive film (A) can be used as a touch panel application. For example, it is preferably 1.4 to 1.5.
  • a method of disposing the light-transmitting underlayer (A-3) as a dry method, for example, a method of laminating on an adjacent layer by a sputtering method, an ion plating method, a vacuum deposition method, or a pulse laser deposition method, etc. Can be mentioned.
  • the light transmissive conductive film (A) has a hard coat layer (A-4) in place of the light transmissive underlayer (A-3) or in addition to the light transmissive underlayer (A-3). And at least one light transmissive conductive layer (A-2) may be disposed on the surface of the light transmissive support layer (A-1) via at least the hard coat layer (A-4). .
  • the light transmissive conductive film (A) includes both the light transmissive undercoat layer (A-3) and the hard coat layer (A-4) on the same surface of the light transmissive support layer (A-1)
  • the light transmissive underlayer (A-3) is disposed on the surface of the light transmissive support layer (A-1) via at least the hard coat layer (A-4).
  • the light-transmitting underlayer (A-3) is preferably disposed adjacent to the hard coat layer (A-4).
  • the hard coat layer (A-4) is preferably disposed adjacent to at least one surface of the light transmissive support layer (A-1).
  • One layer of the hard coat layer (A-4) may be disposed.
  • two or more layers may be arranged adjacent to each other or separated from each other via other layers.
  • the hard coat layer (A-4) may be disposed on both surfaces of the light transmissive support layer (A-1).
  • FIG. 6 shows an embodiment of the laminated film of the present invention.
  • one hard coat layer (A-4) is disposed directly on one surface of the light transmissive support layer (A-1).
  • a light-transmitting underlayer (A-3) is further disposed through the coat layer (A-4), and the light-transmitting conductive layer (A-2) is disposed through the light-transmitting underlayer (A-3). It is further arranged.
  • the other hard coat layer (A-4) is directly disposed on the other surface of the light-transmitting support layer (A-1).
  • Other configurations are the same as those in FIG. 5 described later.
  • the hard coat layer refers to a layer that plays a role in preventing scratches on the plastic surface.
  • the hard coat layer (A-4) is not particularly limited, and for example, a layer normally used as a hard coat layer in a light-transmitting conductive film for a touch panel can be used.
  • the material of the hard coat layer (A-4) is not particularly limited, and examples thereof include acrylic resins, silicone resins, urethane resins, melamine resins, and alkyd resins. Examples of the material for the hard coat layer (A-4) further include those obtained by dispersing colloidal particles such as silica, zirconia, titania and alumina in the resin.
  • the hard coat layer (A-4) may be composed of any one of them, or may be composed of a plurality of types.
  • the hard coat layer (A-4) is preferably an acrylic resin in which zirconia particles are dispersed.
  • the thickness per layer of the hard coat layer (A-4) is not particularly limited, and examples thereof include 0.03 to 10 ⁇ m, 0.5 to 5 ⁇ m, and 1 to 3 ⁇ m.
  • the total thickness of all the hard coat layers (A-4) adjacent to each other may be within the above range. In the example list shown on the left, the following are more preferable than the above.
  • the refractive index of the hard coat layer (A-4) is not particularly limited as long as the light-transmitting conductive film (A) can be used for touch panel applications, and examples thereof include 1.4 to 1.7.
  • the hard coat layer (A-4) may have a higher refractive index than the light-transmitting underlayer (A-3).
  • the light-transmitting underlayer (A-3) is preferably disposed adjacent to one surface of the hard coat layer (A-4).
  • the method of disposing the hard coat layer (A-4) is not particularly limited, and examples thereof include a method of applying to a film and curing with heat, a method of curing with active energy rays such as ultraviolet rays and electron beams, and the like. It is done. From the viewpoint of productivity, a method of curing with ultraviolet rays is preferable.
  • the light-transmitting conductive film of the present invention is formed on at least one surface of the light-transmitting support layer (A-1), in addition to the light-transmitting conductive layer (A-2), the light-transmitting underlayer (A- 3) At least one layer selected from the group consisting of the hard coat layer (A-4) and at least one other layer different from them (A-5) may be further disposed.
  • the other layer (A-5) is not particularly limited, and examples thereof include an adhesive layer.
  • the adhesive layer is a layer that is disposed adjacent to each other between the two layers and is disposed to adhere the two layers to each other. Although it does not specifically limit as a contact bonding layer, For example, what is normally used as a contact bonding layer in the transparent conductive film for touchscreens can be used.
  • the adhesive layer may be composed of any one of these, or may be composed of a plurality of types.
  • the protective film (B) refers to a film that is used by being attached to a light-transmitting conductive film for the purpose of protecting the light-transmitting conductive film mainly when wound as a film roll. .
  • the surfaces of the light transmissive conductive layer and the protective film are adjacent to each other, thereby protecting the light transmissive conductive layer.
  • the protective film (B) is not particularly limited, and can be selected in a wide range from those usually used for this purpose.
  • a protective film (B) is not specifically limited, For example, polyester, a polypropylene, polyethylene, etc. are mentioned. Among these, polyester is preferable in terms of heat resistance.
  • the protective film (B) has a surface facing the light-transmitting conductive layer (A-2) in a state of being wound as a film roll, that is, in other words, the surface on the protective film (B) side of the laminated film is a surface
  • the contact angle with respect to water is 70 ° or more.
  • the contact angle with water is measured as follows. Measurement is performed using an automatic contact angle meter (DM500) manufactured by Kyowa Interface Science Co., Ltd. or its equivalent. Specifically, the sample is cut out, 1 ⁇ L of distilled water is slowly dropped from a height of 5 mm with a syringe, the syringe is quickly separated from the sample, and is further left for 3 seconds. After leaving, the contact angle (angle formed by the tangent line between the hard coat layer surface and the droplet) is observed and measured with a CCD camera. The same operation is repeated 10 times, and the average value is taken as the contact angle with water in the present invention.
  • DM500 automatic contact angle meter
  • the laminated film of the present invention has no problem as long as the haze value is usually at least 5% or less. Therefore, the Haze value of the protective film (B) can be appropriately set within a range where the Haze value of the entire film is 5% or less. In the left column, the Haze value of the entire laminated film is preferably 3% or less, and more preferably 2.5% or less.
  • the thermal shrinkage rates of the protective film (B) and the light-transmitting conductive film (A) can be suppressed.
  • the thickness of the protective film (B) is not particularly limited, but is usually 25 to 125 ⁇ m.
  • the thickness of the protective film (B) is not particularly limited, but it is preferable if the total thickness is 170 ⁇ m or more in a state where the transparent conductive film and the protective film are bonded together. More preferably, the total thickness is 170 to 270 ⁇ m.
  • the thermal shrinkage rates of the protective film (B) and the light-transmitting conductive film (A) can be suppressed.
  • positioning a protective film (B) is not specifically limited, Usually, it can arrange
  • the protective film (B) may have a laminated structure.
  • the protective film (B) is mainly composed of a layer having the configuration and characteristics described in 1.2 above (for convenience, the “protective layer (B-1
  • an adhesive layer (B-2) may be contained.
  • the adhesive layer (B-2) refers to a layer used for the purpose of disposing the protective film (B) on the surface of the light transmissive conductive film (A).
  • the adhesive layer (B-2) is not particularly limited, and can be selected from a wide range of materials usually used for this purpose.
  • an acrylic pressure-sensitive adhesive or a silicone-based pressure-sensitive adhesive is used for this purpose from the viewpoint of processability. Therefore, for example, the pressure-sensitive adhesive layer (B-2) can be formed by appropriately selecting them.
  • the protective film (B) is disposed on the surface of the light-transmitting conductive film via the adhesive layer (B-2). Therefore, the surface of the protective film (B) opposite to the adhesive layer (B-2) has a contact angle with water of 70 ° or more.
  • FIG. 5 shows one embodiment of the conductive film of the present invention.
  • the protective film (B) has the same configuration as that shown in FIG. 1 except that the protective film (B) is composed of a protective layer (B-1) and an adhesive layer (B-2).
  • Oligomer block layer (B-3) In the protective film (B), the layer having the configuration and characteristics described in 1.2 above is used as a main layer (protective layer (B-1)), in addition to the adhesive layer (B-2), or Instead of the layer (B-2), an oligomer block layer (B-3) may be contained.
  • the oligomer block layer (B-3) is used for the purpose of preventing the oligomer from being deposited on the film surface after heat treatment (for example, heat treatment at 150 ° C. for 1 hour) and causing the appearance of the film to become cloudy. It refers to the layer.
  • the material for the oligomer block layer (B-3) can be selected from a wide range of materials usually used for this purpose. More specifically, it can be appropriately selected from those capable of forming a transparent film, and may be an inorganic material, an organic material, or a composite material thereof.
  • the thickness of the oligomer block layer (B-3) is not particularly limited, but is preferably 0.01 to 2 ⁇ m.
  • the protective film (B) is disposed so that the oligomer block layer (B-3) is located on the outermost surface. Therefore, the surface of the oligomer block layer (B-3) needs to have a contact angle with water of 70 ° or more.
  • FIG. 6 shows one embodiment of the conductive film of the present invention.
  • the protective film (B) has the same configuration as that shown in FIG. 1 except that the protective film (B-1) is composed of a protective layer (B-1) and an oligomer block layer (B-3). .
  • the light transmissive conductive film (A) obtained by peeling the protective film (B) from the laminated film of the present invention can be used for the production of touch panels and the like. . Details of the touch panel are as described in 3.
  • the film roll of the present invention is a film roll formed by winding up the laminated film of the present invention.
  • the film roll of the present invention is usually formed by winding the laminated film of the present invention having a width of 0.2 to 2 m and a length of 10 to 1000 m.
  • the film roll of the present invention is not particularly limited, but can be obtained, for example, as follows. On the light-transmitting support layer (A-1), a layer serving as a base of the light-transmitting conductive layer (A-2) and other layers are arranged as necessary, and on the opposite surface. A protective film (B) is stuck and a film roll is created by winding up this laminated film. At this time, the laminated film may be surface-treated.
  • the film roll of the present invention can be obtained by charging this film roll into the sputtering apparatus as it is and forming the light-transmitting conductive layer (A-1) while winding it into a roll.
  • the protective film (B) is further peeled off from the sheet-like laminated film subjected to various processing as required, thereby translucent conductive.
  • a film (A) is obtained and can be used as a transparent electrode for a touch panel.
  • the touch panel of the present invention contains a light transmissive conductive film (A) obtained by peeling the protective film (B) from the laminated film of the present invention, and further contains other members as necessary. It contains.
  • the touch panel of the present invention is not particularly limited, but may be a capacitive touch panel, for example.
  • Specific examples of the configuration of the capacitive touch panel according to the present invention include the following configurations.
  • the protective layer (1) side is used so that the operation screen side faces, and the glass (5) side faces the side opposite to the operation screen.
  • (1) Protective layer (2) Light transmissive conductive film of the present invention (Y-axis direction) (3) Insulating layer (4) Light transmissive conductive film of the present invention (X-axis direction) (5) Glass
  • the capacitive touch panel of the present invention is not particularly limited, for example, it can be produced by combining the above (1) to (5) and other members as required according to a usual method. it can.
  • multilayer film of this invention may contain the process included in the manufacturing method of a transparent electroconductive film (A).
  • the method for producing the light transmissive conductive film (A) includes the step of forming a light transmissive underlayer on at least one surface of the light transmissive support layer (A-1) in addition to the light transmissive conductive layer (A-2). (A-3), a hard coat layer (A-4), and a step of disposing at least one kind of layer selected from the group consisting of at least one kind of other layer (A-5) different from them, respectively. You may go out.
  • the method for producing a laminated film of the present invention may include a step included in the method for producing a protective film (B).
  • the adhesive layer (B-2) is disposed on one surface of the protective layer (B-1), and / or the oligomer block layer (B-3) is disposed on the other surface.
  • Each of the steps may be included.
  • the step of arranging each layer is as described for each layer.
  • the light transmissive support layer is formed on at least one surface of the light transmissive support layer (A-1).
  • the order of arrangement is not particularly limited.
  • another layer may be disposed on one surface of a layer that is not the light-transmitting support layer (A-1) (for example, the light-transmitting conductive layer (A-2)).
  • one composite layer is obtained by arranging two or more layers adjacent to each other on the one hand, or at the same time, two or more layers are similarly disposed adjacent to each other on the other side.
  • one type of composite layer may be obtained, and these two types of composite layers may be further arranged adjacent to each other.
  • multilayer film of this invention is replaced with the above, or in addition to the above, on one surface of a transparent electroconductive film (A), directly or through another film, a protective film ( A step of arranging B) may be included.
  • Example 1.1 Preparation of Hard Coat Material 1.1.1 Hard Coat 1 (H1) A liquid hard coating material (solid content concentration) is added to a photopolymerizer-containing acrylic oligomer by adding a mixed solvent obtained by mixing toluene and methyl isobutyl ketone (MIBK) at a ratio of 5: 5 (weight ratio). : 40% by weight). 1.1.2 Protective film 1 part by weight of an isocyanate-based crosslinking agent is blended with 100 parts by weight of solid content of adhesive SK Dyne 1473H (solid content 30%) manufactured by Soken Chemical Co. A pressure-sensitive adhesive solution adjusted to 10% was prepared.
  • MIBK methyl isobutyl ketone
  • a substrate provided with an oligomer block layer on one side was used as a base material for the PET film. The contact angle of the oligomer block layer was measured and found to be 80 °.
  • This protective film is referred to as “protective film R1”.
  • Example 1 With a 125 ⁇ m thick easily adhesive polyester film (trade name: A4300, manufactured by Toyobo Co., Ltd.) as a light-transmitting support layer, a liquid hard coat material (H1) is applied to one surface thereof with a bar coater, Further, the coated film was heat-dried using a dryer oven under the conditions of 100 ° C. ⁇ 1 minute. Next, the coated film after drying was irradiated with ultraviolet rays (irradiation amount: 300 mJ / cm 2 ) to dispose a hard coat layer having a thickness of about 2 ⁇ m on the light-transmitting support layer.
  • a liquid hard coat material H1
  • irradiation amount 300 mJ / cm 2
  • a protective film R1 was laminated on one side of the hard coat film.
  • a light transmissive conductive layer was formed by magnetron sputtering. Specifically, after the inside of the chamber is evacuated to 5 ⁇ 10 ⁇ 4 Pa or less, a mixed gas composed of 95% Ar gas and 5% oxygen gas is introduced into the chamber, and the pressure in the chamber is reduced to 0. 0. 0. Sputtering was performed at 2 to 0.3 Pa. Sputtering was performed so that the film thickness of the finally obtained transparent conductive layer was 20 nm.
  • the sheet resistance value after annealing of the obtained film was 150 ⁇ / ⁇ .
  • Examples 2-4 Processing was carried out in the same manner as in Example 1 except that protective films (R2 to R4) having the contact angles shown in Table 1 as the contact angle of the oligomer block layer of the protective film were used. 2. Comparative Examples 1 and 2 Processing was carried out in the same manner as in Example 1 except that protective films (R5, R6) having the contact angles shown in Table 1 as the contact angle of the oligomer block layer of the protective film were used. 3.
  • Various evaluation methods Various evaluation methods were performed as follows.
  • the resist cured film was swelled and peeled off from the film substrate by dipping in an alkaline solution, specifically 250 ml of a 3% strength by weight sodium hydroxide aqueous solution.
  • the cured resist film was crushed to an appropriate size using an ultrasonic homogenizer to obtain an alkaline liquid in which a fine resist film was dispersed. 3.1.2 Evaluation Method After the alkali solution is lightly stirred to uniformly disperse the fine resist film, the laminated films obtained in Examples and Comparative Examples are immediately immersed, and the surface on the protective film side A resist film was attached to the film.
  • the resist film adhering to the surface on the protective film side can be easily removed by gently washing with pure water.
  • the protective film side can be removed by shaking the laminated film slightly in pure water.
  • the case where the resist film adhering to the surface was removed was marked as ⁇ , and the case where the resist film was not removed was marked as x.
  • Light transmissive conductive film (A) 111 Light-transmissive support layer (A-1) 112 Light transmissive conductive layer (A-2) 113 Light transmissive underlayer (A-3) 114 Hard coat layer (A-4) 12 Protective film (B) 121 Protective layer (B-1) 122 Adhesive layer (B-2) 123 Oligomer block layer (B-3)

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PCT/JP2014/057551 2013-03-25 2014-03-19 積層フィルム及びそのフィルムロール、並びにそれから得られうる光透過性導電性フィルム及びそれを利用したタッチパネル WO2014156889A1 (ja)

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JP5957133B2 (ja) * 2014-11-20 2016-07-27 日東電工株式会社 保護フィルム付き透明導電性フィルム
JP6563254B2 (ja) * 2015-06-03 2019-08-21 日東電工株式会社 積層体、タッチパネルセンサの製造方法、及び、タッチパネルセンサ
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