JP6497592B2 - Laminated film and touch panel using the same - Google Patents

Description

  The present invention relates to a laminated film suitable for a touch panel, an electromagnetic wave shield, a receiving antenna, an electric heater, and the like, and a touch panel using the same.

  As a conductive film used for a touch panel or an electromagnetic wave shield, a film in which a metal layer formed in an arbitrary pattern shape is provided on a resin film such as a polyester film is known. In particular, circuit materials using a transparent film have been proposed for various applications such as automobiles and display applications because of their light weight and good visibility.

  As a manufacturing method of such a conductive film, after laminating a metal foil such as a copper foil on a transparent film via an adhesive layer, a resist film is pasted, and after exposure through a photomask having a desired pattern shape There is known a method of providing a metal layer formed in a pattern shape on a transparent film by using a photolithography method for developing, etching, and resist peeling (for example, Patent Document 1).

  Among them, in the method of laminating a transparent film and a metal foil (copper foil), a metal foil having a thickness of about 10 μm or more is usually used for uniform bonding, but a metal having a thickness of 10 μm or more is used. When forming a pattern shape with a relatively small line width (for example, less than 10 μm) by etching the foil, the etching speed varies in the thickness direction, so that the cross section of the line formed by etching becomes a wedge shape and the line is transparent. It becomes easy to peel off from a substrate such as a film, and the linearity in the longitudinal direction of the line is deteriorated (for example, the line is distorted). On the other hand, when a metal foil having a thickness of 5 μm or less is used, there is a problem that the metal foil (copper foil) having a thickness of 5 μm or less is expensive, or an opening of an adhesive layer for laminating the transparent film and the metal foil ( The problem is that fine irregularities on the surface of the metal foil are transferred to the part where the metal foil has been removed by etching), and the transparency is deteriorated. In the case of an inexpensive metal foil, it is difficult to reduce the line width. is there.

  In response to the above problems, a metal layer is directly formed on a polyester film such as polyethylene terephthalate by a vapor deposition method, and the metal layer is processed into a fine line pattern using a printing method, a photolithography method, an etching method, or the like. Thus, a method of forming a metal layer having a pattern shape has been proposed. In this method, high conductivity can be obtained even with a metal layer having a relatively small thickness (for example, 4 μm or less). Therefore, by reducing the thickness of the metal layer, the workability of the fine line pattern is improved and the line width is relatively large. It is possible to easily form a high-definition pattern shape with a small (for example, less than 10 μm).

  For example, Patent Documents 2 and 3 describe a method for forming a patterned metal layer using the metal layer formed by the above-described vapor deposition method.

  On the other hand, in order to improve adhesion between a substrate such as a transparent film and a metal layer, it is known that a laminated film such as a primer layer is provided on the substrate in advance (for example, Patent Documents 4 to 7).

  Patent Document 4 discloses a method for producing an electromagnetic wave shielding film in which an undercoat layer made of a urethane resin is applied to a molded article such as ABS resin or polycarbonate, and a metal layer is vacuum-deposited thereon. Patent Document 5 It is disclosed that a primer layer made of an epoxy resin, a polyester resin, a phenol epoxy resin, an acrylic resin, a urethane resin, or the like is provided on a transparent film, and a conductive treatment layer is formed thereon by vacuum deposition. An optical polyester film provided with a coating layer composed of an acrylic resin and a crosslinking agent on a film is applied to a conductive film for a plasma display. Patent Document 7 discloses a urethane resin on a transparent substrate made of a polyamide resin or the like. And a primer layer containing epoxy resin, and an electromagnetic shielding film is formed on it. It discloses an electromagnetic wave shielding molded product.

  On the other hand, in the case of providing a primer layer, Patent Document 8 proposes a method of adding particles in order to prevent winding defects such as blocking that occur when a laminated film is wound. With only control, it is difficult to satisfy both optical characteristics such as haze and prevention of winding defects, and there is an optimum range of particle sizes depending on the thickness of the outermost layer of the laminate I found.

Japanese Patent Laid-Open No. 10-041682 JP 2004-95829 A JP 2005-268688 A JP 2003-112388 A Japanese Patent Application Laid-Open No. 2004-253587 JP 2005-89622 A JP 2007-173736 A JP 2013-56496 A

  Although the metal layer manufactured using the method of patent documents 4-8 improves the adhesiveness with a polyester film, since the surface hardness is so low that resin with good adhesiveness with a metal layer has a roll shape, In the winding process, scratches tend to occur. As a result, scratches occur on the surface of the metal layer provided on the laminated film. When forming a patterned metal layer, the scratches cause pattern disconnection. It was. In particular, when the metal layer is formed by a vapor deposition method, an adhesion layer for laminating the metal layer may be provided. In the transportation process in the manufacturing process, that is, in the transportation process in the step of laminating the metal layer. Scratches were likely to occur in the adhesion layer. Further, the method of simply adding particles to the adhesion layer also causes a problem that the end of the metal pattern in the pattern shape does not become straight due to the influence of the particles, and it is necessary to optimize the adhesion layer and the particles.

  An object of the present invention is to provide a laminated film having surface scratch resistance and excellent adhesion to a metal layer, and a touch panel using the same, in view of the above-described conventional technology.

The said subject of this invention is achieved by the laminated film which concerns on the following this invention.
(1) A resin layer (B) having a pencil hardness of H or higher and a resin layer (C) having a pencil hardness lower than the pencil hardness of the resin layer (B) are provided on at least one surface of the resin film (A). ) Side, the thickness of the resin layer (B) is 0.5-2 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C). A laminated film, wherein a certain t (B) / t (C) is 5 to 20.
(2) The laminated film according to (1), wherein the resin layer (C) has a pencil hardness of 2B or less.
(3) The laminated film according to (1) or (2), wherein the resin layer (B) contains an acrylic resin.
(4) The laminated film according to any one of (1) to (3), wherein the resin layer (C) includes a polyester resin.
(5) The resin layer (C) contains particles, and the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness (t (C)) of the resin layer (C) is 0. The laminated film according to any one of (1) to (4), which is 5 to 2.0.
(6) The laminated film according to (5), wherein the particles are at least one kind of particles selected from the group consisting of silicon oxide particles, barium sulfate particles, alumina particles, and calcium carbonate particles.
(7) The laminated film according to any one of (1) to (6), wherein the total light transmittance is 88% or more and the haze is 2% or less.
(8) The laminated film according to any one of (1) to (7), further comprising a metal layer.
(9) The laminated film according to (8), wherein the metal layer is formed by a vapor deposition method.

The present invention also provides the following touch panel using the above-described laminated film.
(10) A touch panel using the laminated film according to (8) or (9).

  ADVANTAGE OF THE INVENTION According to this invention, the metal layer which has a pattern shape, and resin which can obtain a high-definition pattern shape at low cost can prevent defects, such as drop-off | omission of a wiring by a flaw of a metal layer, and a chip | tip, and is low-cost. A laminated film with improved adhesion to the film can be provided in roll form. Moreover, the high-definition pattern shape obtained by using the laminated | multilayer film of this invention can provide the film for touch panels with favorable light transmittance at low cost.

It is a schematic diagram of the laminated | multilayer film of this invention.

Hereinafter, the present invention will be described in detail together with embodiments.
The laminated film of the present invention is
1) A resin layer (B) having a pencil hardness of H or more and a resin layer (C) having a pencil hardness lower than the pencil hardness of the resin layer (B) are provided on at least one surface of the resin film (A). It is a laminated film laminated in this order from the side, the thickness of the resin layer (B) is 0.5-2 μm, and the ratio of the thickness of the resin layer (B) and the resin layer (C) t (B) / t (C) is a laminated film characterized by being 5-20. Hereinafter, each requirement will be described.

  The resin film (A) is not particularly limited. The resin constituting the resin film (A) is preferably a polyester sheet having excellent optical properties such as transparency, polycarbonate (PC), polycycloolefin, and bisphenol A as a main monomer. Further, the resin film (A) may be a film obtained by bonding a plurality of resin films. Among these, polyester is preferable as the resin constituting the resin film (A) from the viewpoints of excellent flexibility, low cost, high transparency, and excellent heat resistance and chemical resistance.

  Here, the term “polyester” is a general term for polymers having an ester bond as the main bond chain of the main chain. Examples of such polyester include ethylene terephthalate, ethylene-2,6-naphthalate, butylene terephthalate, ethylene-α, β-bis (2-chlorophenoxy) ethane-4,4-dicarboxylate, and the like. Among these, polyesters containing ethylene terephthalate are particularly preferable in view of quality and economy.

  The resin film (A) has various known additives such as antioxidants, heat stabilizers, weather stabilizers, ultraviolet absorbers, organic lubricants, pigments, dyes, organic or inorganic fine particles, fillers. Further, an antistatic agent, a nucleating agent and the like can be contained to such an extent that the effects of the present invention are not impaired.

  The thickness of the resin film (A) is preferably 15 μm to 250 μm, more preferably 50 μm to 200 μm.

  In the laminated film of the present invention, a resin layer (B) having a pencil hardness of H or higher and a resin layer (C) having a pencil hardness lower than the pencil hardness of the resin layer (B) are provided on at least one surface of the resin film (A). It is a laminated film laminated in this order from the film (A) side. Moreover, the laminated film of the present invention is a laminated film having a resin layer (B) having a pencil hardness of H or more and a resin layer (C) having a pencil hardness of 2B or less in this order from the resin film (A) side. More preferred. In the present invention, “pencil hardness” refers to a value based on the pencil scratch value described in the test method defined in JIS K5600-5-4 (1999). The pencil hardness is in the order of 6H, 5H,... HB, B,.

  As a laminated film having a laminated resin layer having a two-layer structure, a film in which the pencil hardness of the first layer on the resin film side is smaller than the pencil hardness of the second layer which is the outer layer has been proposed (for example, JP-A-2013-2003). No. 101177). The purpose of this document is to prevent the curling caused by the difference in hardness between the resin film serving as the base layer and the resin layer serving as the hard coat layer, and to laminate by the hardness difference between the first layer and the second layer. The purpose is to increase the hardness of the film surface. However, a resin layer having a high pencil hardness generally exhibits a pencil hardness of H or higher. To achieve the pencil hardness of H or higher, a coating composition containing a polymerizable monomer or a polymerizable oligomer of an active energy ray-curable resin is applied, Although it can be obtained by forming a polymerizable monomer or a polymerizable oligomer by a crosslinking reaction and / or a polymerization reaction, a resin mainly composed of an acrylic monomer or a urethane acrylate oligomer which is a representative component thereof. The adhesion strength with the metal layer formed by the vapor phase lamination method, which will be described later, is low. Particularly, when the metal layer is patterned with high definition, there is a drawback that the line is easily peeled off or is easily lost. It was.

  Therefore, in the present invention, a laminated film in which a resin layer (B) having a pencil hardness of H or more and a resin layer (C) having a pencil hardness lower than the pencil hardness of the resin layer (B) are laminated in this order from the resin film (A) side; By doing this, the idea was to prevent scratches by increasing the relative hardness of the resin layer (C), and to increase the adhesion strength of the metal layer. Furthermore, the resin layer (B) and the resin layer (C) are respectively a resin layer (B) having a pencil hardness of H or more and a resin layer (C) having a pencil hardness of 2B or less, thereby further preventing scratches and improving the metal layer. Inspired by improved adhesion.

  As the resin layer (B) having a pencil hardness of H or more, a coating composition containing a polymerizable monomer or polymerizable oligomer of the aforementioned active energy ray curable resin is applied, and the polymerizable monomer or polymerizable oligomer is subjected to a crosslinking reaction and / or Or it can obtain by forming by carrying out a polymerization reaction.

  The functional group of the active energy ray-curable polymerizable monomer or polymerizable oligomer is preferably an ultraviolet ray, electron beam or radiation polymerizable functional group, and an ultraviolet polymerizable functional group is particularly preferred. Examples of the ultraviolet polymerizable functional group include ethylenically unsaturated polymerizable functional groups such as (meth) acryloyl group, vinyl group, styryl group and allyl group.

  Although it does not specifically limit as said coating composition, The thing which has an acrylic monomer or a urethane acrylate oligomer as a main component is preferable. Furthermore, it is particularly preferable to form from a composition containing both urethane acrylate and (meth) acrylate.

  In the present invention, the resin layer (B) has a thickness of 0.5 to 2 μm, preferably 0.8 to 1.8 μm, and more preferably 1.0 to 1.5 μm. If the thickness is less than 0.5 μm, sufficient hardness may not be obtained. On the other hand, if the upper limit of the thickness is 2 μm or less, the object can be achieved sufficiently. When the thickness exceeds 2 μm, the time for obtaining the integrated light amount of the active energy ray necessary for curing the resin layer (B) becomes long. When the illuminance of the active energy ray irradiating device is increased, the resin film (A) is caused by excessive heat. This may cause disadvantages in terms of economy and quality.

  Moreover, in this invention, the thickness of the resin layer (B) is 0.5-2 micrometers also for the following reasons. That is, one of the purposes of the resin layer (B) of the present invention is to have wear resistance, and a preferable thickness range for this purpose is 0.5 to 2 μm. If the thickness is less than 0.5 μm, the rigidity is poor and sufficient hardness may not be obtained. On the other hand, when the thickness exceeds 2 μm, the hardness is sufficient, but the flatness such as curl is likely to occur due to the shrinkage stress due to curing, which may cause a problem in the subsequent process. In addition, a long time is required for curing, and variations in curing are likely to occur, which may be complicated in quality control.

  In the present invention, t (B) / t (C), which is a ratio of the thickness (t (B)) of the resin layer (B) and the thickness (t (C)) of the resin layer (C), is 5 to 20. It is. (T (B) / t (C)) (hereinafter referred to as (t (B)), which is the ratio of the thickness (t (B)) of the resin layer (B) to the thickness (t (C)) of the resin layer (C) / T (C))) is more preferably 8-16, and even more preferably 6-15. The present inventors have found that (t (B) / t (C)) has a preferable range in order to achieve both wear resistance and adhesion with the metal layer. When (t (B) / t (C)) is less than 5, since the thickness of the resin layer (C) having a low hardness is too thick, the wear resistance may be lowered. On the other hand, when (t (B) / t (C)) exceeds 20, the adhesion between the resin layer (C) and the metal layer may not be sufficiently exhibited. The laminated film of the present invention has a wear resistance by adjusting the ratio of the thickness (t (B)) of the resin layer (B) to the thickness (t (C)) of the resin layer (C). The adhesiveness with the metal layer mentioned later can be made compatible.

  In the present invention, the resin layer (C) preferably has a pencil hardness of 2B or less. As a material constituting the resin layer (C) having a pencil hardness of 2B or less, for example, there is a polyester resin or a thermosetting product thereof. Since the resin layer (C) is soft as described above, it is possible to absorb stress when laminated with a metal layer described later, which is preferable.

  Moreover, in this invention, it is preferable that the said resin layer (B) contains an acrylic resin. In particular, it is more preferable that an acrylic monomer or a urethane acrylate oligomer is included. Resin layer (B) can raise hardness by including these monomers or oligomers.

  The acrylic resin is not particularly limited and may be either a monomer or an oligomer. Further, the number of functional groups of the acrylate that is the main component of the acrylic resin is not particularly limited, and may be monofunctional or polyfunctional, but is preferably bifunctional or more and hexafunctional or less. More preferably, it is bifunctional or more and trifunctional or less. Acrylates may be used in combination of two or more.

  Although it does not specifically limit as content of the acrylic resin contained in a resin layer (B), 10 mass% or more and 90 mass% or less are preferable when the whole resin layer (B) is 100 mass%, 15 mass% or more 85 mass% or less is more preferable, and 20 mass% or more and 80 mass% or less is further more preferable. When the content of the acrylic resin contained in the resin layer (B) exceeds 90% by mass, the wear resistance and the coating film hardness may be lowered. Moreover, a softness | flexibility falls that a content of the acrylic resin contained in a resin layer (B) is less than 10 mass%, and a crack may generate | occur | produce. On the other hand, when the content of the acrylic resin contained in the resin layer (B) is 10% by mass or more and 90% by mass or less, while maintaining appropriate wear resistance and coating film hardness, moderate flexibility and cracking are maintained. Since generation | occurrence | production of this can be suppressed, it is preferable.

  Although it does not specifically limit as a glass transition temperature of an acrylic resin, 40 to 100 degreeC is preferable and 40 to 80 degreeC is more preferable. It is preferable that the glass transition temperature of the acrylic resin be 40 ° C. or higher and 100 ° C. or lower because the hardness and durability of the resin layer (B) at room temperature can be improved.

  Examples of the acrylic resin contained in the resin layer (B) include (meth) acrylate, but are not particularly limited, and may be either a monomer or an oligomer. The number of functional groups of such (meth) acrylate is not particularly limited, and may be monofunctional or polyfunctional. In addition, durability can improve the acrylic resin contained in a resin layer (B), for example by using trifunctional or more than (meth) acrylate. The (meth) acrylate may have a molecular structure having a polar group or a low-polar molecular structure. (Meth) acrylates may be used alone or in combination of two or more.

  For example, examples of the polar group of (meth) acrylate include a hydroxyl group, a carboxyl group, an amino group, and an amide group.

  Examples of the (meth) acrylate containing a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 2-hydroxy-3-phenoxypropyl (meth). Acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, glycerol mono (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate And (meth) acrylic acid hydroxyl group-containing esters.

  Examples of the (meth) acrylate containing a carboxyl group include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, and 2- (meth) acryloyloxyethyl succinic acid. Examples include acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, and the like.

  Examples of (meth) acrylates containing amino groups include monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl (meth) acrylate, and monoethylaminopropyl (meth) acrylate. And (meth) acrylic acid monoalkylamino esters.

  Examples of the (meth) acrylate containing an amide group include acrylamides such as (meth) acrylamide, N-methyl (meth) acrylamide, and N-methylol (meth) acrylamide.

  Examples of the (meth) acrylate having a low polar molecular structure include (meth) acrylic acid alicyclic ester or (meth) acrylic acid alkyl ester.

  Examples of such (meth) acrylic acid alicyclic esters include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dicyclopentadienyl (meth) acrylate, and tricyclodecanyl. (Meth) acrylate, norbornyl (meth) acrylate, etc. are mentioned.

  Examples of the (meth) acrylic acid alkyl ester include lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, benzyl (meth) acrylate, stearyl (meth) acrylate, butyl (meth) acrylate, 1,6-hexanediol acrylate may be mentioned.

  Moreover, when using compositions other than an acrylic resin, although there exist resin, such as polyester, a polyurethane, and an epoxy, it does not specifically limit.

  In the laminated film according to the present invention, the resin layer (C) preferably contains a polyester resin. Here, the term “polyester” is a general term for polymers having an ester bond as the main bond chain of the main chain. Examples of such polyester include ethylene terephthalate, ethylene-2,6-naphthalate, butylene terephthalate, ethylene-α, β-bis (2-chlorophenoxy) ethane-4,4-dicarboxylate, and the like.

  The resin layer (C) includes urethane resin containing isocyanate, polyester resin having amide bond, polyester resin having a plurality of functional groups, resin having oxazoline group, resin having carbodiimide, melamine resin having amide group, etc. It is preferable to include a resin obtained by mixing and heat-curing because the adhesion strength with the metal layer is improved. As the polyester resin having a plurality of functional groups, a polyester polyol obtained by dehydration condensation of a plurality of carboxylic acids and a polyhydric alcohol is preferable. Carboxylic acids include, but are not limited to, adipic acid and phthalic acid. Examples of the polyhydric alcohol include ethylene glycol, 1,4-butanediol, and 1,6-hexanediol, but are not limited thereto. Examples of the resin having an oxazoline group include resins obtained by radical polymerization of a monomer containing an oxazoline group such as 2-isopropenyl-2-oxazoline and 2-vinyl-2-oxazoline. However, it is not limited to these.

  Examples of the resin containing carbodiimide include dicyclohexylhexicarbodiimide, diisopropylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride, and the like, but are not limited thereto.

  Examples of the melamine resin include, but are not limited to, monomethylol melamine and hexamethylol melamine obtained by reacting melamine and formaldehyde under alkali.

  Although it does not specifically limit as content of the polyester resin contained in a resin layer (C), When the resin layer (C) whole is 100 mass%, 10 mass% or more and 90 mass% or less are preferable, and 15 mass% or more 85 mass% or less is more preferable, and 20 mass% or more and 80 mass% or less is further more preferable. When content of the polyester resin contained in a resin layer (C) exceeds 90 mass%, the adhesion hardness with a resin layer (B) may fall. Moreover, the adhesive strength with a metal layer may fall that content of the polyester resin contained in a resin layer (C) is less than 10 mass%. On the other hand, it is preferable that the content of the polyester resin contained in the resin layer (C) is 10% by mass or more and 90% by mass or less because high adhesion strength can be obtained with both the resin layer (B) and the metal layer. .

  In the laminated film according to the present invention, the resin layer (C) contains particles, and the ratio (R / t) between the average particle diameter R of the particles and the thickness (t (C)) of the resin layer (C). (C)) is preferably 0.5 to 2.0.

  It is preferable that the laminated film of the present invention can be handled in a roll shape. If it can be handled in a roll shape, it can be continuously processed in post-processing, which is economically preferable. In order to handle it in a roll shape, it is preferable to wind the laminated film into a roll shape. In order to take up a roll while preventing defects such as winding wrinkles, scratches, and misalignment, it may be necessary to optimize the surface structure. On the other hand, when the laminated film of the present invention is used for optical applications such as a touch panel, optical characteristics may be important, and high light transmittance and low haze may be required. As described above, the laminated film of the present invention has a structure having both winding properties and optical properties, and also having adhesiveness to the metal layer. As described above, the thickness of the resin layer (C) in the present invention and the average particle size of the particles The optimum value of the ratio to the diameter was found.

  Here, the average particle diameter is an index representing the particle diameter of the added particles, and means the particle diameter having the highest existence probability. The supplied particles should be monodispersed and have a narrow particle distribution. However, when the particle size is selected, the yield of the particles is poor, a special manufacturing method is required, or an expensive manufacturing method is required. There is a case. The particles used in the present invention are preferable because the distribution thereof shows a normal distribution and the average particle size is within a specified range because the object can be achieved.

  When the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) is less than 0.5, the height at which the particles rise from the resin layer (C) is high. It may become low and a winding characteristic may fall. That is, there is a case where moderate friction is not obtained and scratches are likely to occur. On the other hand, when (R / t (C)) exceeds 2.0, the height of the protrusion from the resin layer (C) becomes too high, and the adhesion with the metal layer is hindered, or the metal layer is patterned. When forming into a shape, the end of the pattern shape may be bent by particles, and the end may be rattled and a beautiful pattern may not be obtained. In particular, when the end of the pattern shape is rattled, current loss may increase when used for an electrode that utilizes high frequency, and problems such as difficulty in application may occur. As long as (R / t (C)) satisfies the range of 0.5 to 2.0, particles having a plurality of average particle diameters may be used. In order to achieve both the winding property and the adhesiveness, it is easy to design in a preferable region by using two or more kinds of particles. On the other hand, since the aggregation of particles may occur when the types of particles increase, two to three types are preferable.

  The particles are preferably at least one kind of particles selected from the group consisting of silicon oxide particles, barium sulfate particles, alumina particles, and calcium carbonate particles. As the types of particles, silicon oxide particles, spherical silicon oxide particles, hollow silicon oxide particles, aggregated silicon oxide particles (secondary particles formed by agglomeration of silicon oxide fine particles as primary particles; the same applies hereinafter), barium sulfate. Examples thereof include particles (including spherical particles and aggregated particles), alumina particles (including spherical particles and aggregated particles), and calcium carbonate particles (including spherical particles and aggregated particles), but are particularly excellent in transparency. From the viewpoint, silica particles are particularly preferable.

  The laminated film of the present invention preferably has a total light transmittance of 88% or more and a haze of 2% or less. An optical film used for a touch panel or the like is better as the light transmittance is higher, and at least the total light transmittance is preferably 88% or more, and more preferably 90% or more. Moreover, since the clarity of an image may be impaired when the haze is high, the haze is preferably 2% or less, and more preferably 1.5% or less.

  Moreover, in the laminated film which concerns on this invention, it is preferable to have a metal layer further in the laminated film as mentioned above. As a method for laminating the metal layer, various methods such as a method of laminating a metal foil with an adhesive, a method of forming by wet electroplating, a method of applying metal particles, and the like other than the vapor phase laminating method can be exemplified.

  Since the metal layer in the present invention is preferably a layer having high conductivity, the thickness of the metal layer is preferably 0.05 μm or more, and if it exceeds 10 μm, it is difficult to produce by the vapor deposition method described later. Therefore, the upper limit is preferably 10 μm or less. As a metal constituting the metal layer, an alloy or a multi-layered one or a combination of two or more of metals such as copper, aluminum, nickel, iron, gold, silver, stainless steel, chromium and titanium can be used. Among these, copper is preferably used as the metal constituting the metal layer from the viewpoint of easy processing into a pattern shape and low cost.

  The metal layer may be a single layer or a metal laminate composed of two or more layers. For example, when the metal layer is copper, a layer composed of at least one metal selected from the group consisting of nickel, chromium, and nichrome is preferable as the underlayer. Such a metal laminate is preferable because the adhesion strength with the resin layer (C) of the present invention is further improved.

  Moreover, it is preferable to use a method such as corona treatment of the surface of the resin layer (C) because the adhesion strength can be further improved.

  The metal layer of the laminated film of the present invention preferably has a pattern shape. By having a pattern shape, it can be set as a laminated film suitable for formation of an electrode or a circuit. Therefore, the metal layer can be suitably used for an electrode or a circuit finally by making the metal layer into a pattern shape. Here, the pattern shape is not particularly limited, but a mesh shape and a stripe shape are preferable. As a method for forming the metal layer into a pattern shape, a photoresist-etching method or the like can be used.

  The laminated film of the present invention is preferably formed by laminating metal layers by vapor phase lamination. As described above, there are various methods for laminating a metal layer, such as a method of laminating a metal foil with an adhesive, a method of forming by wet electroplating, a method of applying metal particles, etc., from the viewpoint of uniformity of the metal layer thickness, The laminated film of the present invention is preferably formed by laminating metal layers by a vapor phase lamination method.

  Examples of the vapor deposition method include sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition by induction heating, chemical vapor deposition, and the like. These one method or a combination of two or more methods can be used. In forming the metal layer in the present invention, at least one method selected from the group consisting of sputtering, ion plating, and vacuum deposition is preferred, and sputtering and / or vacuum deposition are particularly preferred.

[Usage]
The laminated film of the present invention can be suitably used for a touch panel. Since a laminated film obtained by further laminating a metal layer on the laminated film of the present invention can easily form a pattern shape, it can be suitably used for a touch panel. In particular, it is suitable for an electrode film of a capacitive touch panel. By using the laminated film of the present invention, a touch panel can be obtained with high productivity. The laminated film of the present invention can also be used for electromagnetic wave shields, receiving antennas, electric heaters, and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples. In addition, the evaluation method of each sample produced by the present Example is shown below.

(1) Thickness measurement of resin layer (B) and resin layer (C) A cross section of the prepared sample was cut out with a microtome, and the cross section was analyzed by a field emission scanning electron microscope (manufactured by JEOL Ltd., JSM-6700F, The film was observed at an acceleration voltage of 10 kV and an observation magnification of 20,000 times, and the thickness of each resin layer was measured. The measurement was carried out for five arbitrary points from one 20 cm × 20 cm sample and averaged.

(2) Pencil hardness About the resin layer (B) and the resin layer (C) which were produced by the Example and the comparative example, respectively JIS
It measured based on K5600-5-4 (1999). The load is 750 g, and the speed is 30 mm / min. As the measuring device, a surface hardness tester (HEIDON; type 14DR) manufactured by Shinto Kagaku Co., Ltd. was used. The environment at the time of measurement is 23 ° C. ± 2 ° C. and relative humidity 55% ± 5%.

(3) Ease of scratching of resin layer (C) About resin layer (C) produced in Examples and Comparative Examples, Gakushin Abrasion Tester (trade name: Gakushin-type friction fastness tester manufactured by Tester Sangyo Co., Ltd.) Evaluation was carried out using. Specifically, 10 mm ² Ben cotton (BEMCOT ^TM type AZ-8, manufactured by Asahi Kasei Co., Ltd.) was used as the rubbing part, and the sliding distance 100 mm was reciprocated 25 times under the conditions of a load of 500 g and a speed of 1 reciprocation / 2 seconds ( That is, the sliding of 200 mm was 1 reciprocation and 25 reciprocations), and the surface of the resin layer (C) was rubbed. The surface of the resin layer (C) after rubbing was visually observed, and the state of the scratch was determined according to the following criteria. S: No scratches on the surface A: A state in which linear scratches are partially observed B: A state in which scratches are significantly generated and clouded.

(4) Average particle diameter of particles The laminated film was dissolved in hexafluoroisopropanol to separate the particles, and about 30 particles obtained were observed with a scanning electron microscope (manufactured by Hitachi, Ltd., S-3100). For each, the diameter of the area-equivalent circle was measured as the particle diameter, and the average value was obtained as the average particle diameter.

(5) Total light transmittance and haze The total light transmittance and haze were measured using a haze meter NDH-4000 manufactured by Nippon Denshoku in accordance with JIS-K 7136 (2000).

(6) Adhesive strength with metal layer Adhesiveness with a metal layer was evaluated by measuring 90 degree peeling strength (F) of the metal layer created by the vapor phase lamination method on the laminated film of the present invention. A sample for measurement is a laminated film obtained by laminating a metal layer on a laminated film by a gas phase lamination method to a width of 50 mm and a length of 100 mm, and a clear line tape No. 1 manufactured by Nichiban Co., Ltd. Five patterns of 557 (tape width 2 mm) were attached to the entire length in the length direction of the laminated film at intervals of 2 mm in the width direction to make a pattern mask for pulling. Further, the laminated film provided with the pattern mask was immersed in a 30% by weight ferrous chloride aqueous solution at a liquid temperature of 30 ° C. for 5 minutes, etched, washed with water, dried, and the pattern mask was peeled off to obtain a sample. .

  A tensile tester (peeling tester) conforming to JIS B 7721 (2009) is equipped with a gripping tool for holding the sample horizontally and making the pulling direction of the sample vertical, and the peeling angle is Fix the sample to the gripping tool with double-sided tape # 500 made by Nitto Denko Co., Ltd. so that it is 90 degrees, peel off only the metal layer with tweezers, and fix it with the clip on the pulling wire of the load cell. Measured. Specifically, Tensilon manufactured by Orientech Co., Ltd. was used, and the peeling rate was 30 mm / min and the measurement length was 50 mm. The average intensity was used as the measurement value, and the average value of the values measured five times was defined as F (N / cm).

(7) Appearance of application In the formation of the resin layer (B) and the resin layer (C), the case where there was no problem in the appearance of application was expressed as S. That is, the coated surface was visually inspected under reflection under a 30 W fluorescent lamp, and A was determined when there was no coating streak or unevenness, and B was determined when there was a coating streak or unevenness.

(8) Rewindability Visual inspection of wrinkles, winding shifts, scratches, and other appearance defects when wound into a roll, under a 30 W fluorescent lamp, S is the case when there are no wrinkles, winding shifts, scratches, etc. The case where there was a defect was determined as B.

Example 1
As the resin film (A), a polyethylene terephthalate (PET) film (“Lumirror” (registered trademark) U48, thickness: 100 μm) manufactured by Toray Industries, Inc. was used. This was cut into a 100 mm × 100 mm square and used.

As a resin layer (B), dilute urethane acrylate resin type U-4205 manufactured by DIC Corporation with methyl isobutyl ketone (hereinafter referred to as MIBK) so as to have a solid content of 35% by mass as a photopolymerization initiator. A composition obtained by adding 5% by mass of “Irgacure” (registered trademark) 184 manufactured by Ciba Specialty Chemicals Co., Ltd. and dissolving was applied with a bar coater so that the dry film thickness was 1.0 μm, and then heated in a hot air oven. After drying at a temperature of 5 ° C. for 5 minutes, the resin layer (B) was formed by irradiating with a high pressure mercury lamp at a distance of 15 cm between the lamp and the resin layer (B) at a light amount of 80 W / cm ² for 1 second. The resin layer (B) had a thickness t (B) of 1.0 μm. When the pencil hardness of the resin layer (B) was evaluated, the hardness was H.

  Further, on the resin layer (B), 24 g of oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) M-6451-60) manufactured by DIC Corporation as a polyester resin is added to DIC Corporation. ) 1.4 g of melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) and melamine curing agent (trade name: “Super Becamine” (registered trademark) L) manufactured by DIC Corporation -105-60) 2.8 g is added, and 0.1 g of a curing accelerator (alkyl acidic phosphate ester trade name: “Beckamine” (registered trademark) P-198) manufactured by DIC Corporation is mixed with 360 g of N butanol. A paint having a solid content of 1% by mass diluted with 360 g of methyl ethyl ketone (hereinafter, MEK) was prepared. Silicon oxide particles having a nominal particle diameter of 200 nm (trade name: Organosol MEK-ST-2040, manufactured by Nissan Chemical Industries, Ltd.) were added to the prepared paint in an amount of 5% by mass to obtain a trial paint. The prototype paint was applied with a metering bar and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.1 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) (t (B) / t (C)) was 10. . When the pencil hardness of the resin layer (C) was evaluated, the hardness was 2B. Moreover, the evaluation of the scratchability of the resin layer (C) was S without scratches. The roll-up property was S without any defects.

  The average particle diameter of the particles was measured and found to be 200 nm, so the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) was 2.0. there were. The total light transmittance of the laminated film was 91%, and the haze was 1.2%.

  Next, after depositing 10 nm of nickel (underlayer) with a batch sputtering apparatus, copper was deposited with a batch type deposition apparatus. At that time, the ultimate vacuum was 0.02 Pa, 5 g of copper was placed on a 0.3 mm thick tungsten boat, and vapor deposition was performed at a current of 200 A for 3 minutes to form a metal layer having a thickness of 1 μm. The adhesion strength with the formed metal layer was 3 N / cm.

(Example 2)
In the same manner as in Example 1, a resin layer (B) was formed, and an oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) manufactured by DIC Corporation as a polyester resin on the resin layer (B). (Trademark) M-6451-60) 24 g, DIC Corporation melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) 1.4 g and DIC Corporation melamine curing agent (Product name: “Super Becamine” (registered trademark) L-105-60) (2.8 g) was added, and DIC Co., Ltd. curing accelerator (alkyl acidic phosphate ester, product name: “Beckamine” (registered trademark) P -198) Mix 0.1g, 360g N-butanol and MEK
A paint having a solid content of 1% by mass diluted with 360 g was prepared. Silicon oxide particles having a nominal particle diameter of 200 nm (trade name: Organosol MEK-ST-2040, manufactured by Nissan Chemical Industries, Ltd.) were added to the prepared paint in an amount of 5% by mass to obtain a trial paint. The prototype paint was applied with a metering bar and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.2 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) (t (B) / t (C)) was 5. . When the pencil hardness of the resin layer (C) was evaluated, the hardness was 6B. Moreover, the evaluation of the scratchability of the resin layer (C) was S without scratches. The roll-up property was S without any defects.

  When the average particle diameter of the particles was measured and found to be 200 nm, the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) was 1.0. there were. The total light transmittance of the laminated film was 90%, and the haze was 1.2%.

  Next, a metal layer having a thickness of 1 μm was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 3 N / cm.

(Example 3)
In the same manner as in Example 1, the resin layer (B) is formed, and on the resin layer (B), an oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered) manufactured by DIC Corporation as a polyester resin. (Trademark) M-6451-60) 24 g, DIC Corporation melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) 1.4 g and DIC Corporation melamine curing agent (Product name: “Super Becamine” (registered trademark) L-105-60) (2.8 g) was added, and DIC Co., Ltd. curing accelerator (alkyl acidic phosphate ester, product name: “Beckamine” (registered trademark) P -198) A paint having a solid content of 1% by mass was prepared by mixing 0.1 g and diluting with 360 g of N butanol and 360 g of MEK. Silicon oxide particles having a nominal particle diameter of 100 nm (trade name: Organosol MEK-ST-L, manufactured by Nissan Chemical Industries, Ltd.) were added to the prepared paint in an amount of 5% by mass to obtain a paint for trial production. The prototype paint was applied with a metering bar and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.05 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) (t (B) / t (C)) was 20. . When the pencil hardness of the resin layer (C) was evaluated, the hardness was 2B. Moreover, the evaluation of the scratchability of the resin layer (C) was S without scratches. The roll-up property was S without any defects.

  When the average particle diameter of the particles was measured, it was 100 nm, and the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) was 2.0. there were. The total light transmittance of the laminated film was 90%, and the haze was 0.5%.

  Next, a metal layer having a thickness of 1 μm was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 2 N / cm.

Example 4
A PET film ("Lumirror" (registered trademark) U48, thickness: 100 μm) manufactured by Toray Industries, Inc. was used as the resin film (A). This was cut into a 100 mm × 100 mm square and used.

As resin layer (B), urethane acrylate resin type U-4205 manufactured by DIC Corporation was diluted with MIBK so as to have a solid content of 35% by mass, and “Ciba Specialty Chemicals Co., Ltd.” as a photopolymerization initiator. A composition obtained by adding 5% by mass of “Irgacure” (registered trademark) 184 and dissolving it was applied with a bar coater to a dry film thickness of 0.5 μm, dried in a hot air oven at 80 ° C. for 5 minutes, and then subjected to high pressure. The resin layer (B) was prepared by irradiating with a mercury lamp at a distance of 15 cm between the lamp and the resin layer (B) at a light quantity of 80 W / cm ² for 1 second. The thickness t (B) of the resin layer (B) was 0.5 μm. When the pencil hardness of the resin layer (B) was evaluated, the hardness was H.

  Further, on the resin layer (B), 24 g of oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) M-6451-60) manufactured by DIC Corporation as a polyester resin is added to DIC Corporation. ) 1.4 g of melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) and melamine curing agent (trade name: “Super Becamine (registered trademark) L-) manufactured by DIC Corporation” 105-60) 2.8 g was added, 0.1 g of a curing accelerator (alkyl acidic phosphate ester trade name: “Beckamine” (registered trademark) P-198) manufactured by DIC Corporation was mixed, and 360 g of N butanol and MEK were mixed. A paint having a solid content of 1% by mass diluted with 360 g was prepared, and silicon oxide particles having a nominal particle diameter of 100 nm (trade name: Organosol MEK-ST-L were added to the prepared paint. NISSAN CHEMICAL INDUSTRIES CO., LTD.) Was added to make 5% by mass when the total paint was 100% by mass, and was used as a trial paint. The resin layer (C) was formed by drying for 30 seconds at 150 ° C. The thickness t (C) of the resin layer (C) was 0.05 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) was A certain (t (B) / t (C)) was 10. When the pencil hardness of the resin layer (C) was evaluated, the hardness was 2B. There was no defect and it was S. The winding property was S without any defect.

  When the average particle diameter of the particles was measured, it was 100 nm, and the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) was 2.0. there were. The total light transmittance of the laminated film was 91%, and the haze was 0.5%.

  Next, a metal layer was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 3 N / cm.

(Example 5)
A PET film ("Lumirror" (registered trademark) U48, thickness: 100 μm) manufactured by Toray Industries, Inc. was used as the resin film (A). This was cut into a 100 mm × 100 mm square and used.

As resin layer (B), urethane acrylate resin type U-4205 manufactured by DIC Corporation was diluted with MIBK so as to have a solid content of 35% by mass, and “Ciba Specialty Chemicals Co., Ltd.” as a photopolymerization initiator. A composition obtained by adding 5% by mass of “Irgacure” (registered trademark) 184 and dissolving it was applied with a bar coater to a dry film thickness of 2.0 μm, dried in a hot air oven at 80 ° C. for 5 minutes, and then subjected to high pressure. The resin layer (B) was prepared by irradiating with a mercury lamp at a distance of 15 cm between the lamp and the resin layer (B) at a light quantity of 80 W / cm ² for 1 second. The resin layer (B) had a thickness t (B) of 2.0 μm. When the pencil hardness of the resin layer (B) was evaluated, the hardness was 2H.

  Further, on the resin layer (B), 24 g of oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) M-6451-60) manufactured by DIC Corporation as a polyester resin is added to DIC Corporation. ) 1.4 g of melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) and melamine curing agent (trade name: “Super Becamine” (registered trademark) L) manufactured by DIC Corporation -105-60) 2.8 g is added, 0.1 g of a curing accelerator (alkyl acidic phosphate ester trade name: “Beckamine” (registered trademark) P-198) manufactured by DIC Corporation is mixed, and 360 g of N butanol is mixed with Silicon oxide particles with a nominal particle size of 200 nm (trade name: Organosol (not a registered trademark) MEK) are prepared by preparing a paint having a solid content of 1% by weight diluted with 360 g of MEK. ST-2040 Nissan Chemical Industries, Ltd.) was added 5 wt% at a weight ratio of coating material, and a prototype paint. The prepared prototype paint was applied with a metal ring bar and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.1 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) (t (B) / t (C)) was 20. . When the pencil hardness of the resin layer (C) was evaluated, the hardness was 2B. Moreover, the evaluation of the scratchability of the resin layer (C) was S without scratches. The roll-up property was S without any defects.

  The average particle diameter of the particles was measured and found to be 200 nm, so the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness t (C) of the resin layer (C) was 2.0. there were. The total light transmittance of the laminated film was 91%, and the haze was 1.2%.

  Next, a metal layer was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 3 N / cm.

(Comparative Example 1)
A PET film ("Lumirror" (registered trademark) U48, thickness: 100 μm) manufactured by Toray Industries, Inc. was used as the resin film (A). This was cut into a 100 mm × 100 mm square and used.

As resin layer (B), urethane acrylate resin type U-4205 manufactured by DIC Corporation was diluted with MIBK so as to have a solid content of 35% by mass, and “Ciba Specialty Chemicals Co., Ltd.” as a photopolymerization initiator. A composition obtained by adding 5% by mass of “Irgacure” (registered trademark) 184 and dissolving it was applied with a bar coater to a dry film thickness of 2.0 μm, dried in a hot air oven at 80 ° C. for 5 minutes, and then subjected to high pressure. The resin layer (B) was prepared by irradiating with a mercury lamp at a distance of 15 cm between the lamp and the resin layer (B) at a light quantity of 80 W / cm ² for 1 second. The resin layer (B) had a thickness t (B) of 2.0 μm. When the pencil hardness of the resin layer (B) was evaluated, the hardness was 2H. Further, the evaluation of the scratchability of the resin layer (B) was S and there was no scratch, but the winding property was B due to frequent occurrence of wrinkles and scratches. The total light transmittance of the laminated film was 91%, and the haze was 0.3%.

  Next, a metal layer was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 0.2 N / cm.

(Comparative Example 2)
On one side of the resin film (A), an acrylic resin (trade name: “Cotax” (registered trademark) LH404, manufactured by Toray Fine Chemical Co., Ltd.) as an acrylic resin (b) having a hydroxyl group, a glass transition point [hereinafter referred to as Tg and Name] Add 40 g of isocyanate (type HX) made by Nippon Polyurethane Co., Ltd. to 3.5 g of 40 ° C.) and apply a 10% solid content paint diluted with MEK 2.95 g and MIBK 2.95 g with a metal ring bar. And it dried for 1 minute at 120 degreeC using the hot air oven, and formed the resin layer (B). The resin layer (B) had a thickness t (B) of 1.0 μm. When the pencil hardness of the resin layer (B) was evaluated, the hardness was HB.

  Further, on the resin layer (B), 24 g of oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) M-6451-60) manufactured by DIC Corporation as a polyester resin is added to DIC Corporation. ) 1.4 g of melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) and melamine curing agent (trade name: “Super Becamine” (registered trademark) L) manufactured by DIC Corporation -105-60) 2.8 g is added, 0.1 g of a curing accelerator (alkyl acidic phosphate ester trade name: “Beckamine” (registered trademark) P-198) manufactured by DIC Corporation is mixed, and 360 g of N butanol is mixed with Silicon oxide particles with a nominal particle diameter of 300 nm (trade name: “Light Star” (registered trademark)) Nissan Chemical Industries, Ltd., prepared with a paint having a solid content of 1% by weight diluted with 360 g of MEK Ltd.) was added to a 5 mass% when the total 100 wt% coating was a coating. This was applied with a metering bar and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.1 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C), t (B) / t (C), was 10. When the pencil hardness of the resin layer (C) was evaluated, the hardness was 4B. The evaluation of how easily the resin layer (C) was damaged was B in which linear scratches were partially observed. The roll-up property was S with no defects and scratches. The total light transmittance of the laminated film was 88%, and the haze was 3.1%.

  Next, after depositing 10 nm of nickel (underlayer) with a batch sputtering apparatus, copper was deposited with a batch type deposition apparatus. At that time, the ultimate vacuum was 0.02 Pa, 5 g of copper was placed on a 0.3 mm thick tungsten boat, and vapor deposition was performed at a current of 200 A for 3 minutes to form a metal layer having a thickness of 1 μm. The adhesion strength with the formed metal layer was 3 N / cm.

(Comparative Example 3)
In the same manner as in Example 1, a resin layer (B) was formed, and an oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) manufactured by DIC Corporation as a polyester resin on the resin layer (B). (Trademark) M-6451-60) 24 g, DIC Corporation melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) 1.4 g and DIC Corporation melamine curing agent (Product name: “Super Becamine (registered trademark) L-105-60) 2.8 g was added, and DIC Co., Ltd. curing accelerator (alkyl acidic phosphate ester, product name:“ Beccamin ”(registered trademark) P- 198) 0.1 g mixed, diluted with 360 g of N butanol and 360 g of MEK, coated with a coating with a solid content of 1% by weight with a metalling bar, dried in a hot air oven at 150 ° C. for 30 seconds, The oil layer (C) was formed, and the thickness t (C) of the resin layer (C) was 0.02 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C) was t (B) / t ( C) was 50. When the pencil hardness of the resin layer (C) was evaluated, the hardness was B. Further, the evaluation of the susceptibility of the resin layer (C) to scratches was S, with no scratches. The properties were wrinkles and B. The total light transmittance of the laminated film was 91%, and the haze was 0.3%.

  Next, a metal layer having a thickness of 1 μm was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 0.5 N / cm.

(Comparative Example 4)
In the same manner as in Example 1, a resin layer (B) was formed, and an oil-free alkyd (polyester) resin (trade name: “Beckolite” (registered trademark) manufactured by DIC Corporation as a polyester resin on the resin layer (B). (Trademark) M-6451-60) 24 g, DIC Corporation melamine curing agent (trade name: “Super Becamine” (registered trademark) L-117-60) 1.4 g and DIC Corporation melamine curing agent (Product name: “Super Becamine” (registered trademark) L-105-60) (2.8 g) was added, and DIC Co., Ltd. curing accelerator (alkyl acidic phosphate ester, product name: “Beckamine” (registered trademark) P -198) Mix 0.1g, 360g N-butanol and MEK
A coating material having a solid content of 1% by weight diluted with 360 g was applied with a metalling bar, and dried at 150 ° C. for 30 seconds using a hot air oven to form a resin layer (C). The thickness t (C) of the resin layer (C) was 0.5 μm, and the ratio of the thickness of the resin layer (B) to the resin layer (C), t (B) / t (C), was 2. When the pencil hardness of the resin layer (C) was evaluated, the hardness was 6B. Further, the evaluation of the susceptibility of the resin layer (C) to the scratch was severe and B. The windability was B with scratches. The total light transmittance of the laminated film was 91%, and the haze was 0.2%.

  Next, a metal layer having a thickness of 1 μm was formed in the same manner as in Example 1. The adhesion strength with the formed metal layer was 3 N / cm.

  In the present invention, when a metal layer is formed on a resin film and etched to form an electrode or a circuit, scratches in a metal layer forming process such as vapor deposition are prevented, and the adhesiveness with the formed metal layer is excellent. A laminated film suitable for a touch panel can be provided. Furthermore, the present invention can be suitably applied to the processing of electrodes and circuits into pattern shapes, but the application range is not limited thereto.

1: Resin film (A)
2: Resin layer (B)
3: Resin layer (C)
10: Laminated film

Claims (10)

  A resin layer (B) having a pencil hardness of H or higher and a resin layer (C) having a pencil hardness lower than the pencil hardness of the resin layer (B) are disposed on at least one surface of the resin film (A) from the resin film (A) side. It is a laminated film formed by laminating in this order, the thickness of the resin layer (B) is 0.5 to 2 μm, and the ratio of the thickness of the resin layer (B) and the resin layer (C) t ( B) Laminated film, wherein t / C is 5-20.   The laminated film according to claim 1, wherein the resin layer (C) has a pencil hardness of 2B or less.   The laminated film according to claim 1 or 2, wherein the resin layer (B) contains an acrylic resin.   The laminated film according to claim 1, wherein the resin layer (C) contains a polyester resin.   The resin layer (C) contains particles, and the ratio (R / t (C)) between the average particle diameter R of the particles and the thickness (t (C)) of the resin layer (C) is 0.5-2. The laminated film according to claim 1, which is 0.0.   The laminated film according to claim 5, wherein the particles are at least one kind of particles selected from the group consisting of silicon oxide particles, barium sulfate particles, alumina particles, and calcium carbonate particles.   The laminated film according to any one of claims 1 to 6, having a total light transmittance of 88% or more and a haze of 2% or less.   The laminated film according to claim 1, further comprising a metal layer.   The laminated film according to claim 8, wherein the metal layer is formed by a vapor deposition method.   A touch panel using the laminated film according to claim 8.

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