JP5908752B2 - Laminate for transparent conductive film substrate - Google Patents

Description

  The present invention relates to a laminate used as a substrate of a transparent conductive film having a patterned transparent conductive layer, which can be used as a sensor electrode of a projected capacitive touch panel.

  In recent years, a projected capacitive touch panel has been used as an input device for mobile devices such as mobile phones and smartphones. This projected capacitive touch panel has been rapidly installed in mobile devices in recent years because of its ease of use through intuitive operations such as multi-touch functions that operate simultaneously with two or more fingers and gesture input functions. Is rising.

  The capacitive touch panel has a configuration in which a capacitive touch sensor is arranged on a display device such as a liquid crystal display. Such a capacitive touch sensor detects the disturbance of the electric field due to the capacitance of a human finger. There are two types of sensor base materials: glass substrates and film substrates. The film base sensors can be continuously produced by roll-to-roll and are relatively inexpensive to manufacture. It has many features that are preferable as a sensor base material for mobile devices, such as being strong against impacts and being hard to break, and being light and thin, and its application range has expanded in recent years.

The capacitive touch sensor uses, as an electrode, a transparent conductive film having a transparent conductive layer patterned (patterned) into a thin line or a diamond shape for position detection. It is the structure which piled up facing each other. Patterning is performed by drawing a desired pattern by photolithography or screen printing, and then etching. At this time, there is a difference in the optical characteristics between the part where the transparent conductive layer is present and the part where the transparent conductive layer is removed. A so-called “bone appearance” phenomenon occurs in which the layer pattern is visually recognized.
In order to solve this problem of bone appearance, so-called index matching technology is known in which an optical adjustment layer is formed by laminating thin films with different refractive indexes, and the difference in optical characteristics is eliminated by utilizing the light interference effect. (Patent Documents 1 to 10).

  By the way, as a base material of a transparent conductive film used for a touch panel, a biaxially oriented polyester film excellent in balance between various properties such as heat resistance, mechanical properties, and optical properties and a price, in particular, a polyethylene terephthalate film has been conventionally used. It was. In addition, since the surface of the biaxially oriented polyester film is generally poor in affinity, when laminating thin films having different refractive indexes, for example, on the film substrate, an easy adhesion component is applied, There is known a technique for forming (Patent Document 11).

JP 2011-142089 A JP 2011-136562 A JP 2011-134482 A JP 2011-116128 A JP 2011-084075 A JP 2011-076932 A JP 2011-044145 A JP 2010-027294 A JP 2010-023282 A JP 2009-076432 A JP 2002-155156 A

In recent years, with an increase in the image quality of displays, a touch sensor in which “bone appearance” is further suppressed has been demanded. However, for such a demand, a general easily adhesive polyester film used for a conventional resistive film type film sensor electrode is used as a base of a transparent conductive film having a patterned transparent conductive layer. It is not enough to apply. The present inventors have found that the degree of bone appearance differs depending on the characteristics of the easy-adhesion layer laminated on the polyester film, and have focused on this. This is considered to be caused by optical interference between the high refractive index layer of the optical adjustment layer, the easy adhesion layer and the polyester film.
On the other hand, when an optical adjustment layer (particularly a high refractive index layer) is formed without having an easy-adhesion layer, sufficient adhesion cannot be obtained and delamination occurs.
Then, an object of this invention is to provide the laminated body for transparent conductive film base materials which made the outstanding index matching characteristic and favorable adhesiveness compatible.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors applied an easy-adhesion layer that satisfies the following characteristics, thereby suppressing the influence of optical interference caused by the easy-adhesion layer and providing a good bone appearance suppression effect. At the same time, it was found that sufficient adhesion was obtained, and the present invention was completed.

That is, the laminate of the present invention adopts the following configuration.
1. A laminate having an easy-adhesion layer and an optical adjustment layer in this order on at least one surface of the polyester film, the easy-adhesion layer containing 50% by mass or more of a polyester resin based on the mass of the easy-adhesion layer, and being refracted The metal oxide particles having a rate of 1.7 to 3.0 are contained in the range of 2% by mass or more and 20% by mass or less based on the mass of the easy adhesion layer, and the refractive index is 1.60 to 1.65. There, thickness 8~30nm der is, the surface direction average refractive index of the polyester film is 1.60 to 1.70, the high refractive index layer in the optical adjustment layer is the adhesive layer side and the low refractive index thereon consists of a layer, the refractive index of the high refractive index layer is 1.60 to 1.80, the refractive index of the low refractive index layer is Ru der 1.40 to 1.60, the laminated transparent conductive film substrate body.
2 . 2. The laminate for a transparent conductive film substrate according to 1 above, wherein the refractive index of the polyester resin in the easy adhesion layer is 1.58 to 1.65.
3 . The transparent conductive film according to any one of 1 or 2 above, wherein the polyester resin in the easy-adhesion layer is a copolymerized polyester resin containing a naphthalenedicarboxylic acid component and / or a diol component having a fluorene structure as a copolymerization component. Laminate for substrate.
4 . The transparent conductive film which has the patterned transparent conductive layer of refractive index 1.9-2.3 on the optical adjustment layer in the laminated body of any one of said 1-3 .

ADVANTAGE OF THE INVENTION According to this invention, the laminated body for transparent conductive film base materials which made the outstanding index matching characteristic and favorable adhesiveness compatible can be provided.
Due to the above effects, when the laminate of the present invention is adopted as a substrate of a transparent conductive film having a patterned transparent conductive layer, a good bone-inhibiting effect can be realized, and a polyester film and an optical adjustment layer Adhesiveness with (especially high refractive index layer) can be made excellent.

The laminate of the present invention has a configuration in which an easy-adhesion layer and an optical adjustment layer are laminated in this order on at least one surface of a polyester film.
Moreover, the transparent conductive film of this invention is a structure which has the transparent conductive layer further patterned on the optical adjustment layer in the said laminated body.
Hereinafter, each component constituting the present invention will be described.

<Polyester film>
(polyester)
In the present invention, the polyester constituting the polyester film is a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof. Specific examples of such polyester include polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclohexylenedimethylene terephthalate), and polyethylene-2,6-naphthalate. Further, these copolymers, blends thereof, or blends of these with a small proportion of other resins may be used. Among these polyesters, polyethylene terephthalate and polyethylene-2,6-naphthalate are preferable because of a good balance between mechanical properties and optical properties. In particular, polyethylene terephthalate has a refractive index after biaxial stretching (average refractive index in the plane direction) close to 1.65, and thus the average refractive index in the plane direction of the polyester film is easily in the range of 1.60 to 1.70. The refractive index adjustment with the optical adjustment layer in the invention is easy to perform, and thereby a better bone appearance suppressing effect can be obtained, which is preferable.

  The polyester may be a homopolymer, but the copolymer component (copolymeric acid component or copolymeric alcohol component) does not impair its properties, for example, 5 mol% or less, preferably 3 based on the total acid component. It may be a copolymer copolymerized in a proportion of mol% or less. Examples of the copolymer acid component include aromatic dicarboxylic acid components such as phthalic acid component, isophthalic acid, and 2,6-naphthalenedicarboxylic acid component, adipic acid component, azelaic acid component, sebacic acid component, and 1,10-decanedicarboxylic acid. An aliphatic dicarboxylic acid component such as an acid component can be exemplified, and examples of the copolymer alcohol component include an aliphatic diol component such as a 1,4-butanediol component, a 1,6-hexanediol component, and a neopentyl glycol component, An alicyclic diol component such as a 4-cyclohexanedimethanol component can be exemplified. These can also be used together.

  Further, as another copolymer component, a compound having two ester-forming functional groups in the molecule other than the above can be used. Examples of such compounds include oxalic acid, dodecanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, phenylindanedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, tetralindicarboxylic acid, decalindicarboxylic acid. , A component derived from a dicarboxylic acid such as diphenyl ether dicarboxylic acid, a component derived from an oxycarboxylic acid such as p-oxybenzoic acid or p-oxyethoxybenzoic acid, or propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene Glycol, cyclohexanemethylene glycol, neopentyl glycol, ethylene oxide adduct of bisphenolsulfone, ethylene oxide adduct of bisphenol A, diethylene glycol, polyethylene It can be preferably used components derived from dihydric alcohol such as ethylene oxide glycol. These compounds may be used alone or in combination of two or more. Of these, the acid component is preferably a component derived from 4,4′-diphenyldicarboxylic acid, 2,7-naphthalenedicarboxylic acid, or p-oxybenzoic acid, and the glycol component is trimethylene glycol. , A component derived from an ethylene oxide adduct of hexamethylene glycol neopentyl glycol and bisphenol sulfone.

  In the present invention, the polyester constituting the polyester film is particularly preferably polyethylene terephthalate. Such polyethylene terephthalate may have a copolymer component as described above, but preferably has an ethylene terephthalate unit of 90 mol% or more, preferably 95% or more, more preferably 97% or more. Particularly preferred is homopolyethylene terephthalate. As the copolymer component, isophthalic acid is preferred.

The polyester in the present invention is a conventionally known method, for example, a method of directly obtaining a low-polymerization degree polyester by reaction of dicarboxylic acid and glycol, or a lower alkyl ester of dicarboxylic acid and glycol is a conventionally known transesterification catalyst. Obtained by a method in which a polymerization reaction is performed in the presence of a polymerization catalyst after reacting with one or more of compounds containing sodium, potassium, magnesium, calcium, zinc, strontium, titanium, zirconium, manganese, and cobalt. Can do. Polymerization catalysts include antimony compounds such as antimony trioxide and antimony pentoxide, germanium compounds represented by germanium dioxide, tetraethyl titanate, tetrapropyl titanate, tetraphenyl titanate or partial hydrolysates thereof, and titanyl ammonium oxalate. , Titanium compounds such as potassium titanyl oxalate and titanium trisacetylacetonate can be used.
The polyester may be converted into chips after melt polymerization, and further subjected to solid phase polymerization under heating under reduced pressure or in an inert gas stream such as nitrogen.

  The intrinsic viscosity of the polyester is preferably 0.40 dl / g or more, and more preferably 0.40 to 0.90 dl / g. If the intrinsic viscosity is less than 0.40 dl / g, process cutting may occur frequently. If it is higher than 0.9 dl / g, melt extrusion is difficult because of high melt viscosity, and the polymerization time is long and uneconomical.

(Polyester film)
The polyester film in the present invention preferably has a plane direction average refractive index of 1.60 to 1.70. Thereby, it is more excellent in a bone appearance suppression effect by the synergistic effect with the other layer which comprises the laminated body of this invention. Here, the average refractive index in the plane direction indicates an average refractive index between the maximum refractive index in the film plane and the refractive index in the direction perpendicular to the direction indicating the maximum refractive index. If the average refractive index in the plane direction is too low or too high, the effect of suppressing bone appearance is reduced. From this viewpoint, the range of the average refractive index in the plane direction of the polyester film is more preferably 1.62 to 1.68, and further preferably 1.64 to 1.66.
In order to achieve such an average refractive index in the plane direction, for example, the above-described polyethylene terephthalate may be employed as the polyester constituting the film. Moreover, it is effective to adopt the conditions described later as the stretching conditions in order to achieve the average refractive index in the plane direction.

Polyester film can contain a slippery filler to ensure transportability, but the capacitive touch sensor is made up of a stack of multiple transparent films, and the haze of the film accumulates. It is desirable that the internal haze of each constituent film is as low as possible. From this viewpoint, it is preferable that the polyester film contains substantially no filler (for example, 10 ppm or less).
The polyester film can also contain a colorant, an antistatic agent, an antioxidant, an organic lubricant, and a catalyst.

<Easily adhesive layer>
The adhesion between the polyester film and the optical adjustment layer can be enhanced by the easy adhesion layer in the present invention.

(Refractive index of easy adhesion layer)
In the present invention, it is important that the easy-adhesion layer has a refractive index in the range of 1.60 to 1.65. Thereby, it is excellent in the bone appearance suppression effect by the synergistic effect with the other layer which comprises the laminated body of this invention. If the refractive index of the easy-adhesion layer is too low, the optical interference becomes too large, so that the bone appearance suppressing effect cannot be obtained. Ideally, it is preferable that the high refractive index layer in the polyester film, the easy-adhesion layer, and the optical adjustment layer are all the same refractive index, but in reality, when trying to achieve a refractive index exceeding 1.65, Therefore, it tends to be difficult to realize a highly transparent easy-adhesion layer. Considering these balances, the refractive index of the easily adhesive layer is preferably 1.61 to 1.64, and more preferably 1.62 to 1.64.

The difference between the refractive index of the easy-adhesion layer and the refractive index of the high refractive index layer described later is preferably 0.05 or less. According to such an embodiment, the effect of improving bone appearance suppression can be increased. The refractive index difference is more preferably 0.04 or less, and still more preferably 0.03 or less.
Moreover, it is preferable that the difference of the refractive index of an easily bonding layer and the surface direction average refractive index of a polyester film is 0.05 or less. According to such an embodiment, the effect of improving bone appearance suppression can be increased. The refractive index difference is more preferably 0.04 or less, and still more preferably 0.03 or less.

(Easily adhesive layer thickness)
The thickness of the easy adhesion layer is 8 to 30 nm. Thereby, it is excellent in adhesiveness. Moreover, while making the refractive index of an easily bonding layer into the range mentioned above, and making thickness into the said range, there exists an outstanding bone-inhibition suppression effect by interaction with the other layer in the laminated body of this invention. it can.

  The optical interference of the thin film depends on the product of the refractive index and the optical path length (film thickness). As a result of conducting further detailed investigations on this matter, the present inventors have found that the film thickness of the easy-adhesion layer when the high-refractive index layer is in the refractive index range described later and the easy-adhesion layer is in the refractive index range. It has been found that the presence of the easy-adhesion layer does not substantially affect the bone appearance performance and the necessary adhesion can be secured by controlling the thickness within a very narrow range of 8 to 30 nm. If the thickness of the easy-adhesion layer is too thick, the effect of suppressing the appearance of bone is reduced. On the other hand, if it is too thin, the adhesiveness decreases. From this viewpoint, the thickness of the easy adhesion layer is preferably 10 nm or more, more preferably 15 nm or more, further preferably 18 nm or more, and preferably 25 nm or less, more preferably 22 nm or less.

(Polyester resin in the easy adhesion layer)
In the easy-adhesion layer in the present invention, the polyester resin occupies 50% by mass or more based on the mass of the easy-adhesion layer. Thereby, it is excellent in adhesiveness. From this viewpoint, the content of the polyester resin is preferably 70% by mass or more, and more preferably 80% by mass or more. The upper limit of the content of the polyester resin in the easy-adhesion layer is not particularly limited, but the polyester resin may occupy the remaining portion other than the components that can be preferably contained in the easy-adhesion layer described later. .

  In this invention, although a polyester resin is used as a binder component which forms an easily bonding layer, it is preferable that the glass transition point (Tg) of this polyester resin is 120 degrees C or less. Thereby, it is further excellent in adhesiveness. In addition, an easy-adhesion layer excellent in stretch following property, smooth and excellent in transparency can be obtained. From this viewpoint, Tg is more preferably 100 ° C. or less, further preferably 80 ° C. or less, and particularly preferably 75 ° C. or less. Moreover, it is preferable that the minimum of the glass transition point Tg of a polyester resin is 40 degreeC, and, thereby, it is further excellent in adhesiveness and excellent in blocking resistance. From this viewpoint, Tg is more preferably 50 ° C. or higher, and particularly preferably 60 ° C. or higher.

  As this polyester resin, the polyester polymer or copolymer which consists of a polybasic acid component and a polyol component as shown below can be mentioned. In the present invention, a copolyester resin is preferable from the viewpoint of adhesiveness. In addition, it is not limited to these monomers as a component of a polyester resin.

  Polybasic acid components include terephthalic acid, isophthalic acid, phthalic acid, phthalic anhydride, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid, trimellitic acid, pyromellitic acid, dimer Examples include components derived from acids, 5-sodium sulfoisophthalic acid, and the like. It is preferable to use two or more of these polybasic acid components as a copolyester. Further, an unsaturated polybasic acid component such as maleic acid, itaconic acid and the like, and hydroxycarboxylic acid such as p-hydroxybenzoic acid, etc., can also be used in a slight amount. In the present invention, 2,6-naphthalenedicarboxylic acid is preferably used from the viewpoint of achieving a balance between the refractive index and the coating film strength. As content of 2, 6- naphthalene dicarboxylic acid in a polyester resin, 50 mol% or more is preferable with respect to 100 mol% of all the acid components, and 60 mol% or more is more preferable. Moreover, 90 mol% or less is preferable, 80 mol% or less is more preferable, and 70 mol% or less is more preferable. When there is too much content of this component, it exists in the tendency for the film forming property of an easily bonding layer to fall. On the other hand, if the amount is too small, the effect of improving the refractive index is small, and the effect of improving the mechanical properties is small.

  Examples of the polyol component include ethylene glycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, xylene glycol, dimethylolpropane, poly (ethylene oxide) glycol, poly The component derived from (tetramethylene oxide) glycol etc. can be mentioned. It is preferable to use two or more of these polyol components as a copolyester. In the present invention, in order to effectively increase the refractive index of the easy adhesion layer, it preferably has a conjugated system such as a diol component having a fluorene structure such as a bis (4-hydroxyethoxyphenyl) fluorene component. It is preferable to use a compound as a copolymerization component. As content of the diol component which has a fluorene structure in a polyester resin, 2 mol% or more is preferable with respect to 100 mol% of all acid components, 4 mol% or more is more preferable, and 6 mol% or more is further more preferable. Moreover, 10 mol% or less is preferable and 8 mol% or less is more preferable. When there is too much content of this component, it exists in the tendency for the film forming property of an easily bonding layer to fall. On the other hand, if the amount is too small, the effect of improving the refractive index is small.

  In the present invention, among these components, a 2,6-naphthalenedicarboxylic acid component is adopted as the acid component, and at the same time, a diol component having a fluorene structure, preferably a bis (4-hydroxyethoxyphenyl) fluorene component, is used as the polyol component. The embodiment adopted is preferred. Thereby, it becomes easier to set the refractive index of the easy-adhesion layer within the range defined by the present invention, and at the same time, the mechanical properties are excellent and the effect of improving the adhesiveness can be enhanced. An embodiment in which these components are contained in the polyester resin at the above-described contents is preferable.

The particularly preferred embodiment of the polyester resin constituting the easy-adhesion layer in the present invention is such that the acid component is 60 to 70 mol% of 2,6-naphthalenedicarboxylic acid, 25 to 30 mol% of isophthalic acid, and 5-sodium sulfoisophthalic acid. Is 5 to 10 mol%, the glycol component is 10 to 20 mol% of bisphenol A, 35 to 60 mol% of ethylene glycol, 25 to 35 mol% of trimethylene glycol, bis (4-hydroxyethoxyphenyl) fluorene Is an embodiment consisting of 5 to 10 mol%.
The polyester resin is preferably a polyester that is soluble or dispersible in water (which may contain some organic solvent), and it is easy to produce a coating liquid described later.

(Metal oxide particles)
In order to control the refractive index, it is preferable to add metal oxide particles having a refractive index of 1.7 to 3.0, preferably 1.8 to 2.2, in the easy adhesion layer in the present invention. Examples of the metal oxide particles include TiO ₂ (refractive index 2.5), ZrO ₂ (refractive index 2.4), SnO ₂ (refractive index 2.0), and Sb ₂ O ₃ (refractive index 2.0). In the present invention, it is preferable to use at least one metal oxide particle selected from the group consisting of these.

In order to achieve a high degree of transparency, in order to avoid optical scattering by the metal oxide particles in the easy-adhesion layer, the metal oxide particles are colorless and transparent and have a particle size sufficiently small with respect to the wavelength of light (for example, 400 nm or less, preferably 100 nm or less) is preferable. A higher refractive index is preferable because the refractive index of the easy-adhesion layer can be increased with a small amount, but a high refractive index filler with a refractive index exceeding 3.0 is inferior in transparency, and a special rare metal is used. This is not preferable because it increases the manufacturing cost.
From this point of view, the metal oxide particles in the present invention are more preferably particles made of titanium oxide and zirconium oxide, and titanium oxide particles having a high refractive index improving effect in a small amount are particularly preferable from the viewpoint of specific gravity.

  The addition amount of the metal oxide particles is preferably 2% by mass or more and 20% by mass or less based on the mass of the easy-adhesion layer, and by making it within this range, the refractive index is efficiently increased while maintaining transparency. be able to. If the amount is too large, the transparency tends to decrease. In addition, particle dropping or the like tends to occur, equipment wear occurs during coating, and stable coating tends to be difficult. On the other hand, if the amount is too small, the effect of improving the refractive index is lowered. From this viewpoint, it is more preferably 3% by mass or more, further 4% by mass or more, particularly preferably 5% by mass or more, more preferably 15% by mass or less, still more preferably 10% by mass or less, and further preferably 8% by mass or less. Is particularly preferred.

  In order to increase the refractive index of the easy adhesion layer, as described above, there are means such as a method of adding a high refractive index filler such as metal oxide particles and a method of increasing the refractive index of a polyester resin as a binder component. However, the use of metal oxide particles has a problem of equipment wear and is difficult to add in a large amount. On the other hand, when trying to increase the refractive index of the binder resin, the glass transition temperature tends to increase at the same time. There is a problem that the film cannot follow the deformation at the time and the coating film is broken in the stretching process and the film haze is increased. Therefore, from these restrictions, it is necessary to appropriately balance the refractive index of the binder resin, the refractive index and the addition rate of the metal oxide particles, and in the present invention, there is a mode in which the above preferred ranges are simultaneously employed. Most preferred.

(Lubricant particles)
It is preferable that the easy-adhesion layer in this invention contains the lubricant particle for providing lubricity other than the metal oxide particle of the said specific refractive index range. By containing the lubricant particles, it is possible to impart lubricity and scratch resistance to the film.
Examples of such lubricant particles include inorganic lubricant particles such as calcium carbonate, magnesium carbonate, calcium oxide, silicon oxide, sodium silicate, aluminum hydroxide, and carbon black, acrylic cross-linked polymers, styrene cross-linked polymers, and silicones. Examples thereof include organic lubricant particles such as resin, fluororesin, benzoguanamine resin, phenol resin, and nylon resin. These may be used alone or in combination of two or more.

The average particle diameter of the lubricant particles is preferably 10 to 180 nm, more preferably 20 to 150 nm. The thickness of the easy-adhesion layer of the present invention is thinner than 80 to 120 nm, which is the thickness of the easy-adhesion layer in a normal optical film. Therefore, if the average particle diameter is larger than 180 nm, the lubricant particles easily fall off. Moreover, if it is smaller than 10 nm, sufficient lubricity and scratch resistance may not be obtained, which is not preferable.
The content of the lubricant particles is preferably 0.1 to 10% by mass per 100% by mass of the easy-adhesion layer. If it is less than 0.1% by weight, sufficient lubricity and scratch resistance cannot be obtained, and if it exceeds 10% by weight, the surface haze is increased and the optical properties are deteriorated.

(Crosslinking agent)
In the present invention, it is preferable to add a crosslinking agent for the purpose of improving the coating strength of the easy-adhesion layer and for enhancing the effect of improving the adhesiveness. As the crosslinking agent, from the above viewpoint, the acrylic resin described later is preferably used in the present invention. However, since such a component has a low refractive index, it leads to a decrease in the refractive index of the easy-adhesion layer. You need to be careful.

  The crosslinking agent is preferably a compound having an oxazoline group and a polyalkylene oxide chain, more preferably an acrylic resin having an oxazoline group and a polyalkylene oxide chain, from the viewpoint of improving the coating film strength and further improving the adhesiveness. Use. An acrylic resin is preferable because it can easily copolymerize many kinds of functional groups. The acrylic resin having an oxazoline group and a polyalkylene oxide chain is preferably an acrylic resin that is soluble or dispersible in water (may contain some organic solvent).

Examples of the acrylic resin having an oxazoline group and a polyalkylene oxide chain include those containing the following monomers as components.
Examples of the monomer having an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, Examples include 2-isopropenyl-4-methyl-2-oxazoline and 2-isopropenyl-5-methyl-2-oxazoline. These may be used alone or in a mixture of two or more. Among these, 2-isopropenyl-2-oxazoline is preferred because it is easily available industrially. By using an acrylic resin having an oxazoline group, the cohesive force of the easy-adhesion layer is improved and the adhesion to the high refractive index layer is further strengthened. Further, it is possible to impart scratch resistance to the metal roll in the film forming process or in the processing process of the high refractive index layer. From the viewpoint of such an effect, the component is preferably contained in the acrylic resin in an amount of 10 to 50 mol%, more preferably 20 to 40 mol%, still more preferably 25 to 35 mol%. .

  Examples of the monomer having a polyalkylene oxide chain include those obtained by adding polyalkylene oxide to an ester part of acrylic acid or methacrylic acid. Examples of the polyalkylene oxide chain include polymethylene oxide, polyethylene oxide, polypropylene oxide, and polybutylene oxide.

  By using an acrylic resin having a polyalkylene oxide chain, the compatibility between the polyester resin and the acrylic resin in the easy-adhesion layer is improved compared to an acrylic resin not containing a polyalkylene oxide chain, and the transparency of the easy-adhesion layer is improved. Can be improved. It is preferable to contain 2-20 mol% of this component in an acrylic resin, and it is more preferable to contain 5-15 mol%.

  It is preferable that the repeating unit of a polyalkylene oxide chain is 3-100, More preferably, it is 4-50, More preferably, it is 5-20. If the number of repeating units of the polyalkylene oxide chain is too small, the compatibility between the polyester resin and the acrylic resin tends to be poor, and the transparency of the coating layer tends to be poor. On the other hand, if it is too large, the moisture resistance of the coating layer is poor. The thermal properties are lowered, and the adhesiveness to the high refractive index layer tends to be lowered particularly at high humidity and high temperature.

  The content of the crosslinking agent in the easy-adhesion layer is preferably 1 to 20% by mass, more preferably 2 to 15% by mass, and more preferably 2 to 15% by mass, based on 100% by mass of the polyester resin and the crosslinking agent in the easy-adhesion layer. Preferably it is 8-15 mass%.

<Optical adjustment layer>
The optical adjustment layer refers to a layer having a function of suppressing the appearance of bone by matching the reflection and transmission characteristics of light in a portion where the transparent conductive layer exists and a portion where the transparent conductive layer does not exist. The optical adjustment layer is usually composed of at least one high refractive index layer and at least one low refractive index layer, which are appropriately combined. Each of the high refractive index layer and the low refractive index layer may have a plurality of layers. Usually, it becomes a lamination order of a polyester film, a high refractive index layer, and a low refractive index layer. In the present invention, a high refractive index layer is provided on the side close to the polyester film, and a low refractive index layer is provided on the side opposite to the polyester film of the high refractive index layer. Some embodiments are preferred.

(High refractive index layer)
The high refractive index layer is a layer having a refractive index of 1.60 to 1.80. By setting it as such a refractive index range, it is excellent by the bone appearance suppression effect by interaction with the other layer in this invention. If the refractive index is too high or too low, the effect of suppressing bone appearance tends to be low. From this viewpoint, the refractive index of the high refractive index layer is preferably 1.60 to 1.75, more preferably 1.60 to 1.70, still more preferably 1.62 to 1.68, and particularly preferably 1. 64 to 1.66.

  The high refractive index layer is preferably a layer comprising a metal and / or metal oxide and optionally a binder resin. Especially, it is preferable that it is a layer which consists of a metal oxide and binder resin. An example of such a metal oxide is a metal oxide film obtained by a sol-gel method. In this case, the metal oxide film can be a high refractive index layer. The metal oxide film may optionally contain a binder resin. Examples of the metal oxide include metal oxide fine particles. In this case, the metal oxide particles may include an embodiment in which the metal oxide particles are dispersed in the metal oxide film formed by the sol-gel method described above, or an embodiment in which the metal oxide particles are dispersed in the binder resin.

  In the above, the type of metal oxide forming the film and fine particles in the high refractive index layer is not particularly limited as long as the above refractive index is satisfied, but the strength of the obtained film can be increased. From the viewpoint of being able to have an appropriate refractive index, it should be at least one selected from the group consisting of titanium oxide, zinc oxide, cerium oxide, zirconium oxide, indium-containing tin oxide, antimony-containing tin oxide and zinc antimonate. preferable. Among these, titanium oxide, antimony-containing tin oxide, and zirconium oxide are particularly preferable from the viewpoints of particularly high film strength and excellent dispersibility in the case of fine particles. These metal oxides may be used alone or in combination of two or more. That is, the metal oxide film which consists of 2 or more types of metal oxides may be sufficient, and the aspect containing 2 or more types of metal oxide fine particles may be sufficient. In the embodiment in which metal oxide fine particles are contained in the metal oxide film, the metal oxide forming the film and the metal oxide forming the fine particles may be the same or different. Good.

  Examples of the binder resin in the high refractive index layer include acrylic resins, urethane resins, melamine resins, alkyd resins, siloxane polymers, and organic silane condensates. Among them, those having a skeleton that has a high refractive index may be preferably used. From the viewpoint of film strength, the binder resin is preferably formed by curing with heat, ultraviolet rays, electron beams or the like. Adhesiveness can be further improved by the binder resin.

A particularly preferable embodiment of the high refractive index layer in the present invention is an embodiment in which a binder resin is contained in the metal oxide film, and an organosilane condensate is particularly preferably contained in the titanium oxide film. It is an aspect.
Commercially available products can also be used as metal oxides preferably used for the high refractive index layer. For example, zirconium oxide: HXU-110JC (manufactured by Sumitomo Osaka Cement Co., Ltd.), titanium oxide: nanotech Ti-Tolu (Ci Kasei), zinc oxide: nanotech ZnO-Xylene (Ci Kasei), cerium oxide: Nidral (Taki Chemical) Indium-containing tin oxide: products manufactured by Mitsubishi Materials, antimony-containing tin oxide: SN-100D (manufactured by Ishihara Sangyo Co., Ltd.), zinc antimonate: Cellnax series (manufactured by Nissan Chemical Industries, Ltd.), etc. .

(Low refractive index layer)
The low refractive index layer is a layer having a refractive index of 1.40 to 1.60. By setting it as such a refractive index range, it is excellent by the bone appearance suppression effect by interaction with the other layer in this invention. If the refractive index is too high or too low, the bone appearance suppression effect tends to be low. From this viewpoint, the refractive index of the low refractive index layer is preferably 1.42 to 1.55, more preferably 1.43 to 1.50, and still more preferably 1.44 to 1.48.

  The low refractive index layer is not particularly limited as long as it satisfies the above refractive index, and may be a layer made of a binder resin, a layer made of a metal oxide, or a binder resin and a metal. It may be a layer made of an oxide. Moreover, organic particles with a low refractive index can be optionally contained. An example of such a metal oxide is a metal oxide film obtained by a sol-gel method. In this case, the metal oxide film can be a low refractive index layer. The metal oxide film may optionally contain a binder resin. Examples of the metal oxide include metal oxide fine particles. In this case, the metal oxide particles may include an embodiment in which the metal oxide particles are dispersed in the metal oxide film formed by the sol-gel method described above, or an embodiment in which the metal oxide particles are dispersed in the binder resin.

  In the above, the kind of metal oxide forming the film and fine particles in the low refractive index layer is particularly preferably silica from the viewpoint of forming a layer having a suitable low refractive index. Moreover, a more preferable low refractive index can be obtained by containing organic silane-based silicon compounds and low refractive index organic particles such as fluorine compounds as organic particles. Further, the refractive index can be lowered by forming voids by including a void forming agent in the layer.

  Examples of the binder resin in the low refractive index layer include acrylic resins, urethane resins, melamine resins, alkyd resins, siloxane polymers, and organic silane condensates. Among them, those having a skeleton that has a low refractive index may be preferably used. From the viewpoint of film strength, the binder resin is preferably formed by curing with heat, ultraviolet rays, electron beams or the like.

A particularly preferable embodiment of the low refractive index layer in the present invention is an embodiment comprising a metal oxide film, and a silica film formed by a sol-gel method is particularly preferable.
In the present invention, by providing the high refractive index layer and the low refractive index layer as described above in the above-described arrangement, bone appearance is suppressed due to a synergistic effect with the other layers in the present invention.

  Further, at the same time as setting the refractive index of the high refractive index layer in the above range, the thickness is preferably 50 to 250 nm, more preferably 100 to 200 nm, and still more preferably 125 to 175 nm. Can be high. Further, at the same time as setting the refractive index of the low refractive index layer within the above range, the thickness is preferably 5 to 50 nm, more preferably 10 to 45 nm, and further preferably 20 to 40 nm, thereby further improving the effect of suppressing bone appearance. Can be high. Furthermore, the improvement effect of bone appearance suppression can be further heightened by making the thickness of each layer into the said preferable range simultaneously.

<Other layers>
The laminated body of this invention may have another layer in the range which does not inhibit the objective of this invention. For example, you may have the adhesion layer for bonding with another optical member in the surface on the opposite side to the optical adjustment layer of a polyester film. Moreover, you may have smoothing layers, such as a hard-coat layer, on an easily bonding layer, and may have an optical adjustment layer on it, for example. In this case, the smoothing layer exhibits suitable adhesion to both the easy adhesion layer and the optical adjustment layer (high refractive index layer) in the present invention. By doing so, the adhesiveness of a polyester film and an optical adjustment layer (high refractive index layer) can be ensured as a result.

<Manufacture of polyester film>
An example is given and demonstrated about the method for manufacturing the polyester film in this invention. In addition, the polyester film in this invention is not limited to this.

  The polyester film in the present invention is obtained by, for example, melt-extruding the polyester into a film shape, cooling and solidifying with a casting drum to form an unstretched film, and forming the unstretched film in the longitudinal direction (in the film forming machine axis direction) at Tg to (Tg + 60) ° C. In some cases, it may be referred to as “longitudinal direction or MD.”) Once or twice or more so that the total magnification becomes 3 to 6 times to form a uniaxially stretched film. Here, Tg is a glass transition point of polyester constituting the film. Preferably, the coating liquid for forming the easily bonding layer mentioned later here is apply | coated. Next, the magnification is 3 to 5 times in the width direction (a direction perpendicular to the film forming machine axis direction and the thickness direction, sometimes referred to as a lateral direction or TD) at Tg to (Tg + 60) ° C. It is obtained by stretching, further heat treatment at 180-230 ° C. for 1-60 seconds as necessary, and re-heat treatment while shrinking 0-20% in the width direction at a temperature 10-20 ° C. lower than the heat treatment temperature. Can do.

  The refractive index of the biaxially stretched polyester film can be adjusted by the stretching ratio, and the higher the stretching ratio, the higher the refractive index. However, since the thermal dimensional stability is impaired as the draw ratio increases, the draw ratio is preferably in the range of 3.0 to 4.0, more preferably 3.3 to 3. It is 8 times, more preferably 3.4 to 3.7 times.

In the present invention, in the production of the polyester film, the sequential biaxial stretching method as described above can be adopted, but the simultaneous biaxial stretching method can also be adopted. At that time, the stretching conditions and the like are the same as those described above. In this case, the coating liquid for forming the easy-adhesion layer is applied to the unstretched film.
The thickness of the polyester film used in the present invention is preferably in the range of 20 to 200 μm. In particular, when used in a capacitive touch sensor, it can be appropriately selected according to the characteristics of the controller IC in order to ensure a predetermined capacitance.

<Manufacture of laminates>
An example is given and demonstrated about the method for manufacturing the laminated body of this invention. In addition, the laminated body of this invention is not limited to this.

(Easily adhesive layer)
The easy-adhesion layer is obtained by applying a coating liquid for forming the easy-adhesion layer (hereinafter sometimes referred to as an easy-adhesion coating liquid) on the polyester film, drying, and curing as necessary. Can be formed. A so-called in-line coating method is preferred in which an easy-adhesion coating solution is applied during the production process of the polyester film to form an easy-adhesion layer. Thereby, the adhesiveness of a polyester film and an easily bonding layer can be made high. Further, even if the easy-adhesion layer is very thin, it can be controlled with high accuracy.

The easy-adhesion coating liquid can be obtained by mixing the above-mentioned components for forming the easy-adhesion layer and diluting with a solvent as necessary. Here, each component may be added as it is, or may be added after dissolving or dispersing in an appropriate solvent, or may be diluted with an appropriate solvent. The concentration of the coating liquid can be appropriately set depending on the viscosity of the coating liquid, the coating thickness, the coating method, and the like.
A conventionally well-known method can be employ | adopted as a coating system for forming an easily bonding layer. Examples thereof include a roll coating method (such as a gravure roll coating method) and a spray coating method.

(High refractive index layer, low refractive index layer)
The high refractive index layer and the low refractive index layer can be formed by either a wet method or a dry method. When an optical adjustment layer is formed by forming a high refractive index layer on the easy-adhesion layer or forming a low refractive index layer on the high refractive index layer by any suitable method. Good.

In the wet method, a coating liquid for forming a high refractive index layer (hereinafter referred to as a high refractive index coating) is formed by a doctor method, a bar coater, a gravure roll coater, a curtain coater, a knife coater, a spin coater, a spray method, an immersion method or the like. And a coating liquid for forming a low refractive index layer (hereinafter sometimes referred to as a low refractive index coating liquid) is applied to the surface on which the layer is to be formed. The coating film is dried, and the coating film is dried and, if necessary, cured by heat, ultraviolet rays, an electron beam, or the like, thereby forming a high refractive index layer and a low refractive index layer. Such a coating solution may be a sol, whereby a metal oxide film is obtained. In addition, what is necessary is just to select drying conditions and hardening conditions suitably. Although depending on the solvent of the coating liquid, the drying temperature is, for example, 50 to 100 ° C., preferably 60 to 90 ° C. The irradiation intensity of ultraviolet rays or electron beams in curing is, for example, 100 to 2000 mJ / m ² . The solid content concentration of the coating liquid can also be appropriately selected depending on the intended coating amount and the coating method used. For example, it is 1-70 mass%.

According to the wet method, a layer containing metal oxide fine particles in a binder resin, a layer made of a metal oxide film by a sol-gel method, a metal oxide film containing metal oxide particles, organic particles, and a binder resin It is suitable for forming the layer which carries out.
In the dry method, a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method, a printing method, a CVD method, or the like can be applied. The dry method is suitable for forming a layer made of metal or a layer made of a metal oxide film. Note that the conditions may be appropriately adjusted in consideration of the type of target, the target layer thickness, and the like.

<Transparent conductive film>
In the present invention, a transparent conductive layer having a refractive index of 1.9 to 2.3 is formed on the optical adjustment layer of the laminate obtained above, in particular, on the low refractive index layer. Can be obtained.

  In the present invention, the transparent conductive layer is not particularly limited as long as it is within the above refractive index range, and examples thereof include a layer made of a crystalline metal or a crystalline metal compound. Examples of the component constituting the transparent conductive layer include metal oxides such as silicon oxide, aluminum oxide, titanium oxide, magnesium oxide, zinc oxide, indium oxide, and tin oxide. Of these, a crystalline layer mainly composed of indium oxide is preferable, and a layer made of crystalline ITO (Indium Tin Oxide) is particularly preferably used. When the transparent conductive layer is a crystalline film, the environmental reliability required for the touch panel tends to be improved. The method of crystallization is not particularly limited, and for example, the crystallization can be performed by heat treatment at 120 to 160 ° C. for about 60 to 90 minutes.

A layer made of a conductive polymer such as polyacetylene, polyparaphenylene, polythiophene, polyethylenedioxythiophene, polypyrrole, polyaniline, polyacene, polyphenylene vinylene, or the like can also be employed.
The film thickness of the transparent conductive layer is preferably 5 to 50 nm from the viewpoints of transparency and conductivity. More preferably, it is 5-30 nm. When the film thickness of the transparent conductive layer is less than 5 nm, the resistance stability with time tends to be inferior, and when it exceeds 50 nm, the surface resistance value tends to decrease. In addition, the color tone of the film becomes strong and the pattern tends to be emphasized.

  When the transparent conductive film of the present invention is used for a touch panel, the surface resistance value of the transparent conductive layer is 100 to 1000Ω / □ at a thickness of 10 to 30 nm, more preferably due to reduction of power consumption of the touch panel and circuit processing. It is preferable to use a transparent conductive layer having a range of 140 to 600Ω / □.

<Manufacture of transparent conductive film>
The transparent conductive layer can be formed by a known method. For example, a physical formation method (such as a DC magnetron sputtering method, an RF magnetron sputtering method, an ion plating method, a vacuum deposition method, a pulse laser deposition method) (Physical Vapor Deposition (PVD)) or the like can be used, but DC magnetron sputtering is desirable from the viewpoint of industrial productivity of forming a metal compound layer having a uniform film thickness over a large area. In addition to the physical formation method (PVD), a chemical formation method such as chemical vapor deposition (CVD) or a sol-gel method can be used. A sputtering method is preferred.

  In addition, the transparent conductive layer in this invention is patterned. Here, patterning refers to an aspect in which a portion where the transparent conductive layer exists in a prescribed shape and a portion where the transparent conductive layer does not exist are formed. That is, the transparent conductive layer is formed on a part of the laminate of the present invention. The specified shape may be a known shape that can be used as an electrode of a capacitive touch panel. For example, there are fine wire and tiremond patterns. The patterning method is not particularly limited, and a conventionally known etching method can be used.

  Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples. Various measurements in the examples were performed as follows.

1. Refractive Index of Easy Adhesive Layer Using an ellipsometer (M-200) manufactured by JASCO Corporation, the phase difference (delta) and amplitude (psi) are measured for the easy adhesive layer forming surface of the polyester film having the easy adhesive layer. From the above, the refractive index of the easy-adhesion layer at a wavelength of 550 nm was determined.

2. The average refractive index in the plane direction of the polyester film The average refractive index in the plane direction of the polyester film was a value obtained by measurement using an Abbe refractometer (D line 589 nm). That is, the longitudinal direction of the polyester film is 90 °, the width direction perpendicular to it is 0 °, the refractive index is measured every 5 °, the direction showing the maximum refractive index is specified, and the refraction in the direction perpendicular to the direction is determined. The average of these refractive indexes was taken as the average refractive index in the plane direction.

3. Refractive index of high refractive index layer, low refractive index layer, refractive index of polyester resin Using a laser refractometer prism coupler, model 2010 manufactured by Metricon, model 2010, the dried solid of the coating liquid for forming each layer has a wavelength of 633 nm Measurement was performed using
In addition, the dried product of the coating liquid for forming each layer was prepared by drying the coating liquid in an oven at 80 ° C. for 24 hours under normal pressure.

4). Film thickness of each layer The film thickness of each layer was measured by observing the cross section of the film sample with a field emission transmission electron microscope HF-3300 manufactured by Hitachi, Ltd.

5. Adhesion Using a sample in which a high refractive index layer is formed on an easy adhesion layer, a cross cut (100 squares of 1 mm ² ) is applied to the high refractive index layer, and a cellophane having a width of 24 mm is formed thereon. After affixing tape (manufactured by Nichiban Co., Ltd.) and abruptly peeling off at a 180 ° peeling angle, the crosscut portion was visually observed, and the adhesion between the easy-adhesion layer and the high refractive index layer was evaluated according to the following criteria. .
○: Peeling area is less than 20% ... Adhesive strength is good Δ: Peeling area is 20% or more and less than 50% ... Adhesive force is somewhat good ×: Peeling area is 50% or more ...

6). Pattern visibility (evaluation of bone appearance)
In the transparent conductive film having the patterned transparent conductive layer, the boundary between the portion where the transparent conductive layer exists and the portion where the transparent conductive layer does not exist was visually observed, and the visibility was evaluated according to the following criteria.
○: The boundary is hardly visible △: The boundary is slightly noticeable ×: The boundary is noticeable

[Example 1]
<Manufacture of a polyester film having an easy adhesion layer>
After a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.60 dl / g is dried at a temperature of 120 to 150 ° C., it is melted at a temperature of 290 ° C. using an extruder and is passed through a slit-shaped die on a casting drum. Extruded to cool. The obtained unstretched film was continuously sent to a stretching process, and stretched 3.5 times in the machine direction at a temperature of 110 ° C., and then an aqueous dispersion of a copolymer polyester resin shown in Table 1 and a crosslinking agent (acrylic resin). And an aqueous dispersion of titanium oxide particles (refractive index of 2.5) (trade name: titanium oxide slurry, average particle size 80 nm) of titanium oxide particles (refractive index 2.5). Using a gravure roll coater, the coating liquid A obtained by mixing so as to have a ratio shown as coating liquid A of 2 and diluting the coating liquid to 10% by mass with ion-exchanged water is used. And applied to one side. The coating thickness was adjusted to 15 nm after drying.
Subsequently, both ends of the film coated with the coating liquid were grasped with clips, preheated at 100 ° C. for 2 minutes, stretched 3.6 times in the lateral direction at a temperature of 130 ° C., and heat-fixed at 230 ° C. for 2 minutes, and A biaxially stretched polyester film having an adhesive layer was obtained. The thickness of this polyester film was 125 μm. The maximum refractive index in the surface direction was 1.66, the refractive index in the direction orthogonal to the direction showing the maximum refractive index was 1.64, and the average refractive index in the surface direction was 1.65.

<Formation of optical adjustment layer>
On the easy-adhesion layer of the obtained biaxially stretched polyester film, a tetrabutyl titanate tetramer (TBT B-4 manufactured by Nippon Soda Co., Ltd.) in a ligroin / n-butanol (3/1% by volume) solution was added to γ- A coating liquid obtained by adding 15 parts by mass of glycidoxypropyltrimethoxysilane to 100 parts by mass of alkoxide was applied by microgravure coating, dried at 150 ° C. for 2 minutes, and a 150 nm thick high refractive index layer ( A refractive index of 1.65) was formed.
Further, a SiO ₂ sol obtained by dissolving tetraethyl silicate in ethanol and hydrolyzing it with water and hydrochloric acid was applied, heat-treated at 100 ° C. for 2 minutes, and a 30 nm thick SiO ₂ gel film (refractive An index of 1.45) was formed as a low refractive index layer. Thus, an optical adjustment layer composed of two layers of a high refractive index layer and a low refractive index layer having different refractive indexes was formed, and a laminate was prepared.

<Formation of transparent conductive layer>
An ITO layer (refractive index 2.1) is formed on the low refractive index layer in the laminate by sputtering using an indium oxide-tin oxide target having a composition of indium oxide and tin oxide of 95: 5 by weight and a packing density of 98%. Formed. The film thickness of the formed ITO layer was 40 nm. Next, on the ITO layer, a photoresist patterned in stripes is applied and formed, dried and cured, and then immersed in 25 ° C., 5% hydrochloric acid (aqueous hydrogen chloride solution) for 1 minute. Etching of the ITO film was performed. Thereafter, the photoresist was removed. Further, heat treatment was performed at 150 ° C. for 90 minutes to crystallize the ITO film, and a patterned transparent conductive layer was formed. Table 3 shows the properties of the transparent conductive film thus obtained.

[Examples 2 to 4, Comparative Examples 1 to 4]
The laminate and the transparent conductive film were prepared in the same manner as in Example 1 except that the coating liquid shown in Table 3 was used and the thickness of the easy-adhesion layer was changed to the thickness shown in Table 3 by adjusting the wet coating amount. Obtained. The evaluation results are shown in Table 3.

  The laminate of the present invention can be suitably used as a substrate for a transparent conductive film having a patterned transparent conductive layer. Thereby, the electrode by which the bone appearance was suppressed can be obtained and the capacitive touch panel excellent in visibility can be obtained.

Claims (4)

A laminate having an easy-adhesion layer and an optical adjustment layer in this order on at least one surface of the polyester film, the easy-adhesion layer containing 50% by mass or more of a polyester resin based on the mass of the easy-adhesion layer, and being refracted The metal oxide particles having a rate of 1.7 to 3.0 are contained in the range of 2% by mass or more and 20% by mass or less based on the mass of the easy adhesion layer, and the refractive index is 1.60 to 1.65. There, thickness 8~30nm der is, the surface direction average refractive index of the polyester film is 1.60 to 1.70, the high refractive index layer in the optical adjustment layer is the adhesive layer side and the low refractive index thereon consists of a layer, the refractive index of the high refractive index layer is 1.60 to 1.80, the refractive index of the low refractive index layer is Ru der 1.40 to 1.60, the laminated transparent conductive film substrate body. Refractive index of the polyester resin in the adhesive layer is 1.58 to 1.65, the transparent conductive film substrate for laminate according to claim 1. The transparent conductive according to any one of claims 1 and 2 , wherein the polyester resin in the easy-adhesion layer is a copolymer polyester resin containing a naphthalene dicarboxylic acid component and / or a diol component having a fluorene structure as a copolymer component. Laminate for conductive film substrate. On the optical adjustment layer in the laminated body according to any one of claims 1 to 3 having a transparent conductive layer patterned refractive index 1.9 to 2.3, the transparent conductive film.