JP6383796B2 - Optical film, conductive film, touch panel, display device - Google Patents

Description

  The present invention relates to an optical film, a conductive film, a touch panel, and a display device.

As a film used for a display device such as a liquid crystal display device or an organic EL display device or a touch panel, a substrate (film) made of a cyclic olefin resin having excellent optical properties is known.
On the other hand, a base material made of a cyclic olefin-based resin is often inferior in adhesiveness to other members, and conventionally, an easy-adhesion layer is provided on the surface of the base material. For example, in patent document 1, the easily bonding layer containing a polyurethane resin is disclosed. In the Example column of Patent Document 1, silica fine particles (average particle diameter of 100 nm) are included in the easy adhesion layer. In addition, when manufacturing the easy-adhesion layer, a layer having a dry film thickness of 0.5 μm is once produced on the base material, and then the base material is stretched at a stretch ratio of 2.0 times. It is considered that an easy adhesion layer having a thickness of about 0.25 μm is manufactured. In this embodiment, the size of the silica fine particles (100 nm) corresponds to about 40% of the thickness (250 nm) of the easy adhesion layer.

JP 2012-206343 A

On the other hand, an optical film having a base material made of a cyclic olefin-based resin and an easy-adhesion layer is often wound into a roll during storage or transport.
The present inventor adheres the optical films to each other when the optical film satisfying the relationship between the size of the silica fine particles disclosed in Patent Document 1 and the thickness of the easy-adhesion layer is wound into a roll. I found out that the handling was bad. That is, it was found that so-called blocking resistance was not sufficient.
Moreover, as another requirement calculated | required by an easily bonding layer, suppression of the fall of the silica fine particle from an easily bonding layer, ie, what is called powder falling, is also calculated | required from the point of the handleability, for example.
Furthermore, the adhesion of the easy-adhesion layer (specifically, the adhesion of the easy-adhesion layer to the substrate and the adhesion with each layer arranged on the easy-adhesion layer), From the viewpoint of bonding each member to the surface, it is also required that the surface property of the easy-adhesion layer is excellent.

In view of the above circumstances, an object of the present invention is to provide an optical film having an easy-adhesion layer excellent in surface properties and excellent in blocking resistance and adhesion, and in which fine particles are prevented from falling off.
Another object of the present invention is to provide a conductive film, a touch panel, and a display device including the optical film.

As a result of intensive studies on the above problems, the present inventors have controlled the size of the fine particles and the thickness of the easy-adhesion layer so as to have a predetermined relationship, and by using a predetermined amount of a surfactant, It was found that an effect can be obtained.
More specifically, the present inventors have found that the above object can be achieved by the following configuration.

1st embodiment of this invention has a base material which consists of cyclic olefin resin, and an easily bonding layer arrange | positioned adjacent to a base material, Glass transition temperature is 50 degreeC or more in an easily bonding layer. A polyurethane resin, fine particles having an average particle diameter of 1.0 to 5.0 times the thickness of the easy-adhesion layer, and a surfactant are contained, and the content of the surfactant is based on the total mass of the easy-adhesion layer. The optical film is 0.7 to 8.0% by mass.
In the first embodiment, the surfactant preferably contains an anionic surfactant.
In the first embodiment, the easy-adhesion layer preferably has a thickness of 25 to 400 nm.
In the first embodiment, the fine particles are preferably metal oxide fine particles.
In the first embodiment, the easy-adhesion layer preferably has at least one of a crosslinked structure derived from a carbodiimide-based crosslinking agent and a crosslinked structure derived from an oxazoline-based crosslinking agent.
In the first embodiment, the polyurethane resin preferably has a glass transition temperature of 130 ° C. or lower.
In the first embodiment, the polyurethane resin is a resin obtained by curing a curable polyurethane, and the curable polyurethane preferably contains a silanol group.
The second embodiment of the present invention is a conductive film having the optical film of the first embodiment and a conductive layer.
The third embodiment of the present invention is a touch panel having the conductive film of the second embodiment.
The fourth embodiment of the present invention is a display device having the optical film of the first embodiment.

ADVANTAGE OF THE INVENTION According to this invention, while being excellent in blocking resistance and adhesiveness, the optical film which has the easily bonding layer which was excellent in the surface property by which fine powder fall-off was suppressed can be provided.
Moreover, according to this invention, the electroconductive film, touch panel, and display apparatus containing the said optical film can also be provided.

Below, suitable aspects, such as an optical film of this invention, are demonstrated. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
As described above, the feature of the optical film of the present invention is that the size of the fine particles and the thickness of the easy-adhesion layer are controlled to have a predetermined relationship, and a predetermined amount of surfactant is used. It is done. By adjusting the size of the fine particles and the thickness of the easy-adhesion layer so as to have a predetermined relationship, the adhesion between the optical films and the dropping of the fine particles are mainly suppressed. That is, blocking resistance and fine particles can be prevented from falling off. Moreover, by adjusting the content of the surfactant, easy adhesion and surface properties are improved.

The optical film of the present invention has a base material made of a cyclic olefin resin (hereinafter, also simply referred to as “base material”) and an easy-adhesion layer disposed adjacent to the base material.
Hereinafter, each member included in the optical film will be described in detail.

<Base material made of cyclic olefin resin>
The optical film includes a base material (cyclic olefin resin base material) made of a cyclic olefin resin.
The cyclic olefin-based resin is a resin obtained by polymerizing a cyclic olefin monomer, for example, a resin obtained by polymerizing only a cyclic olefin monomer, or a resin obtained by copolymerizing a cyclic olefin monomer and a chain olefin monomer. Can be mentioned. Especially, in the cyclic olefin resin, an aspect in which the repeating unit derived from the cyclic olefin monomer is more than 50% by mass and 100% by mass or less with respect to all the repeating units.
Preferred examples of the cyclic olefin-based resin include saturated norbornene resin-A and saturated norbornene resin-B described below. Any of these saturated norbornene resins can be formed by a solution film forming method or a melt film forming method, but the saturated norbornene resin-A is more preferably formed by a melt film forming method, and the saturated norbornene resin- More preferably, B is formed by melting and solution casting.

(Saturated norbornene resin-A)
As the saturated norbornene resin-A, (1) a ring-opening (co) polymer of a norbornene-based monomer is subjected to polymer modification such as maleic acid addition or cyclopentadiene addition, and then further hydrogenated. Obtained resin, (2) Resin obtained by addition polymerization of norbornene monomer, (3) Obtained by addition copolymerization of norbornene monomer and olefin monomer such as ethylene and α-olefin Examples thereof include resins. The polymerization method and the hydrogenation method can be performed by conventional methods.

  Examples of the norbornene-based monomer include norbornene and alkyl and / or alkylidene substituted products thereof (for example, 5-methyl-2-norbornene, 5-dimethyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl- 2-norbornene, 5-ethylidene-2-norbornene, etc.), polar group substituents such as halogens thereof; dicyclopentadiene, 2,3-dihydrodicyclopentadiene, etc .; dimethanooctahydronaphthalene, alkyl and / or alkylidene thereof Substituents and polar group substituents such as halogen; adducts of cyclopentadiene and tetrahydroindene, etc .; 3-pentamers of cyclopentadiene, and the like. These norbornene monomers may be used alone or in combination of two or more.

(Saturated norbornene resin-B)
Examples of the saturated norbornene resin-B include those represented by the following general formulas (1) to (4). Among these, those represented by the following general formula (1) are particularly preferable.

In general formulas (1) to (4), R ^{1 to} R ¹² each independently represent a hydrogen atom or a monovalent substituent (preferably an organic group), and at least one of them is a polar group. Is preferred. The weight average molecular weight of these saturated norbornene resins is usually preferably 5,000 to 1,000,000, more preferably 8,000 to 200,000.

  As a saturated norbornene resin, at least one tetracyclododecene derivative represented by the following general formula (5) is used alone, or a tetracyclododecene derivative and an unsaturated cyclic compound copolymerizable therewith are subjected to metathesis polymerization. A hydrogenated polymer obtained by hydrogenating a polymer obtained in this manner can also be used.

In General Formula (5), R ^{13 to} R ¹⁶ each independently represent a hydrogen atom or a monovalent substituent (preferably an organic group), and at least one of these is preferably a polar group.
In the tetracyclododecene derivative represented by the general formula (5), when at least one of R ^{13 to} R ¹⁶ is a polar group, the adhesion with other materials, heat resistance, and the like are excellent. Further, the polar group is a group represented by — (CH ₂ ) _n COOR (where R is a hydrocarbon group having 1 to 20 carbon atoms, and n is an integer of 0 to 10). The resulting hydrogenated polymer is preferred because it has a high glass transition temperature.

  In the present invention, other cycloolefins capable of ring-opening polymerization can be used in combination. Specific examples of such cycloolefins include compounds having one reactive double bond such as cyclopentene, cyclooctene, and 5,6-dihydrodicyclopentadiene. The content of these ring-opening polymerizable cycloolefins is preferably 0 to 50 mol%, more preferably 0.1 to 30 mol%, more preferably 0.3 to the norbornene-based monomer. It is especially preferable that it is 10 mol%.

The cyclic olefin-based resin may be a cyclic olefin copolymer containing an ethylene unit and a norbornene unit. Ethylene units, -CH ₂ CH ₂ - is a repeating unit represented by. A cyclic olefin copolymer is obtained by vinyl polymerization of the ethylene unit with the norbornene unit described above.
In addition, the cyclic olefin copolymer may contain a small amount of repeating units composed of other copolymerizable vinyl monomers in addition to the ethylene unit and the norbornene unit. Specific examples of the other vinyl monomers include propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1 -C3-C18 alpha olefins such as octadecene, cycloolefins such as cyclobutene, cyclopentene, cyclohexene, 3-methylcyclohexene and cyclooctene.

More specifically, the cyclic olefin-based resin has an alicyclic structure in the main chain of cycloolefin as a monomer obtained by ring-opening metathesis polymerization of cyclic olefin (for example, norbornenes) and subsequent hydrogenation reaction. Examples thereof include a resin (COP) and a resin (COC) obtained by addition polymerization of a cyclic olefin (for example, norbornenes) and an α-olefin (for example, ethylene).
Specific examples of COP include polytetracyclododecene identified by the trade name “ZEONOR” of Nippon Zeon Co., Ltd. Specific examples of COC include ethylene norbornene copolymer identified by the trade name “TOPAS” of TOPAS Advanced Polymers, and ethylene tetracyclododecene identified by the trade name “APEL” of Mitsui Chemicals, Inc. -Copolymers, ethylene / tetracyclododecene / methacrylic acid ester / copolymer specified by the trade name “ARTON” of JSR Co., Ltd.

The base material may contain other additives other than the cyclic olefin-based resin (for example, an antioxidant, an ultraviolet absorber, a slipping agent, and an antistatic agent) as necessary.
Also, for the purpose of firmly bonding each layer to the substrate, chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid It is preferable to perform surface activation treatment such as treatment or ozone acid treatment.

  The thickness of the substrate is not particularly limited, and is preferably 20 to 100 μm, more preferably 20 to 80 μm, and still more preferably 30 to 50 μm from the viewpoint of handleability.

<Easily adhesive layer>
The easy adhesion layer is a layer disposed adjacent to the above-described base material, and a conductive layer or the like is disposed on the surface opposite to the base material side. The easy-adhesion layer contains at least a polyurethane resin, fine particles, and a surfactant.
Below, each component contained in an easily bonding layer is explained in full detail first.

(Polyurethane resin)
The easy adhesion layer includes a polyurethane resin. The polyurethane resin has excellent adhesion to the substrate and also exhibits excellent adhesion to various members disposed on the easy-adhesion layer.
The glass transition temperature (Tg) of the polyurethane resin is 50 ° C. or higher, and is preferably 60 ° C. or higher, more preferably 100 ° C. or higher, and preferably 150 ° C. or lower, in terms of better blocking resistance or adhesion of the easy adhesion layer. 130 ° C. or lower is more preferable.
When the glass transition temperature of the polyurethane resin is less than 50 ° C., the easy-adhesive adhesion is poor.
The glass transition temperature is measured using a differential scanning calorimeter (device name: DSC8500, manufactured by Perkin Elmer). Measurement conditions are as follows: temperature condition: -70 ° C to 180 ° C, temperature increase: 20 ° C / min. In addition, as a sample for measurement, about 5 mg of resin of an easily bonding layer is shaved from an optical film and used.

The polyurethane resin is a polymer compound having a urethane bond in the molecule, and is usually produced by a reaction between a polyol and an isocyanate.
Examples of the polyol include polyester polyols, polycarbonate polyols, polyether polyols, polyolefin polyols, and acrylic polyols. These compounds may be used alone or in combination.
As the isocyanate, an aliphatic, alicyclic or aromatic compound containing an average of two or more isocyanate groups in one molecule may be used.

The polyurethane resin can be produced by using a curable polyurethane that is cured to become a polyurethane resin. A commercial item can be used as such curable polyurethane.
As a preferred embodiment of the curable polyurethane, a self-crosslinking curable polyurethane is preferable, and a curable polyurethane having a silanol group is particularly preferable.
In addition, as another preferred embodiment of the curable polyurethane, curing in which a hydrophilic group such as a carboxylate (such as —COONa) or a sulfonate (such as —SO ₃ Na) is introduced into the main chain or side chain is used. By using these in combination with a crosslinking agent described later, a crosslinked structure derived from the crosslinking agent can be introduced into the easy-adhesion layer.
As a polyurethane resin or a curable polyurethane, for example, commercially available products are Superflex 830, 460, 870, 420, 420NS (Daiichi Kogyo Seiyaku Co., Ltd. polyurethane), Hydran AP-40F, WLS- 202, HW-140SF (Dainippon Ink Chemical Co., Ltd. polyurethane), Olester UD500, UD350 (Mitsui Chemicals Co., Ltd. polyurethane), Takelac W-615, W-6010, W-6020, W-6061, W-405, W-5030, W-5661, W-512A-6, W-635, and WPB-6601 are included, and self-crosslinking type WS-6021, WS-5000, WS-5100, WS-4000, WSA-5920, WF-764 (Mitsui Takeda Chemical Co., Ltd.) .

  Although content in particular of the polyurethane resin in an easily bonding layer is not restrict | limited, 50-100 mass% is preferable with respect to the total mass of an easily bonding layer at the point which the adhesiveness of an easily bonding layer is more excellent, and 60-90 mass%. Is more preferable.

(Fine particles)
The easy adhesion layer contains fine particles. As will be described later, when fine particles of a predetermined size are included in the easy-adhesion layer, a part of the fine particles protrude from the surface of the easy-adhesion layer, and as a result, the optical films are stuck to each other when they are wound up. Can be suppressed.
The average particle diameter of the fine particles is 1.0 to 5.0 times the thickness of the easy-adhesion layer, and the anti-blocking property of the easy-adhesion layer is more excellent, and the powder falling off of the fine particles is further suppressed. -3.5 times are preferable and 1.5-3.0 times are more preferable.
When the average particle size of the fine particles is less than 1.0 times the thickness of the easy adhesion layer, the blocking resistance of the easy adhesion layer is poor. When the average particle size of the fine particles is more than 5.0 times the thickness of the easy-adhesion layer, fine particles are likely to fall off.
In addition, as a measuring method of the average particle diameter of the fine particles, the particle diameter (equivalent circle diameter) of 100 fine particles arbitrarily selected from an image taken using a microscope (for example, a scanning electron microscope) is measured. Find them by arithmetic averaging. The equivalent circle diameter is a diameter of a circle assuming a true circle having the same projected area as the projected area of particles at the time of observation.
Moreover, the thickness of the said easily bonding layer intends average thickness. The method for measuring the average thickness will be described in detail later.

  The average particle diameter of the fine particles may be in a range in which the thickness with the easy-adhesion layer is in a predetermined relationship as described above, but the points such as blocking resistance and adhesion of the easy-adhesion layer, and handleability, etc. 10 to 600 nm is preferable, and 40 to 200 nm is more preferable.

The type of fine particles is not particularly limited, and examples thereof include inorganic fine particles, organic fine particles, and organic-inorganic composite fine particles.
Examples of the inorganic fine particles include metal oxide fine particles such as silica fine particles, alumina fine particles, titania fine particles, zirconia fine particles, and zinc oxide fine particles, metal fine particles such as gold and silver, and carbon fine particles.
Examples of the organic fine particles include acrylic resin fine particles, acrylic-styrene copolymer fine particles, silicone fine particles, melamine resin fine particles, polycarbonate fine particles, polyethylene fine particles, polystyrene fine particles, and benzoguanamine resin fine particles. It is done.
Among these, metal oxide fine particles are preferable and silica fine particles are more preferable from the viewpoint of handleability.

  The content of the fine particles in the easy-adhesion layer is not particularly limited. 0.5 to 20% by mass is preferable, and 1.5 to 15% by mass is more preferable.

(Surfactant)
The easy-adhesion layer contains a surfactant. By using the surfactant, the easy-adhesion layer is easily arranged uniformly on the substrate.
The content of the surfactant contained in the easy adhesion layer is 0.7 to 8.0% by mass with respect to the total mass of the easy adhesion layer, and / or the adhesion of the easy adhesion layer is more excellent, and / or In terms of more excellent surface properties of the easy-adhesion layer, 1.5 to 6.0% by mass is preferable, and 2.0 to 4.0% by mass is more preferable.
When content of surfactant is less than 0.7 mass%, the adhesiveness and surface property of an easily bonding layer are inferior. When the content of the surfactant is more than 8.0% by mass, the adhesion of the easy adhesion layer is inferior.
In the easy adhesion layer, only one type of surfactant may be used, or two or more types of surfactants may be used.

The type of the surfactant is not particularly limited, and a known surfactant can be used. For example, an ionic surfactant (anionic surfactant, cationic surfactant, amphoteric surfactant), or , Nonionic surfactants (nonionic surfactants, silicone surfactants, fluorosurfactants), and ionic surfactants are preferred in that the surface properties of the easy-adhesion layer are superior. Anionic surfactants are more preferred.
Further, an anionic surfactant and a nonionic surfactant may be used in combination.

Examples of the anionic surfactant include alkylbenzene sulfonates such as dodecylbenzene sulfonic acid, aromatic sulfonic acid surfactants such as dodecyl phenyl ether sulfonate, monosoap anionic surfactants, and ether sulfates. Surfactants, phosphate surfactants, carboxylic acid surfactants and the like can be mentioned.
Examples of the cationic surfactant include alkylamine salts and quaternary ammonium salts.
Examples of amphoteric surfactants include alkyl betaine surfactants and amine oxide surfactants.
Examples of nonionic surfactants include sugar ester surfactants such as sorbitan fatty acid esters and polyoxyethylene sorbitan fatty acid esters, fatty acid ester surfactants such as polyoxyethylene resin acid esters and polyoxyethylene fatty acid diethyl And ether surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene / polypropylene glycol, and the like.

  For easy adhesion layers, film-forming aids, matting agents, slipping agents, antifoaming agents, antifoaming agents, dyes, fluorescent whitening agents, preservatives, water-resistant agents, antistatic agents, etc. May be included.

Although the thickness of an easily bonding layer is not restrict | limited in particular, 10-600 nm is preferable, 25-400 nm is more preferable, and 30-250 nm is more preferable at the point which the effect of this invention is more excellent. In addition, the thickness of the said easily bonding layer is an average thickness, the thickness in the positions of five or more arbitrary points of an easily bonding layer is measured, and those are arithmetically averaged.
The easy adhesion layer may be a single layer or two or more layers, but is preferably a single layer.

<Method for producing optical film>
The manufacturing method in particular of an optical film is not restrict | limited, A well-known method is employable. For example, a composition for forming an easy adhesion layer is applied on a substrate, and if necessary, a method of applying a curing treatment to form an easy adhesion layer, or preparing an easy adhesion layer on a temporary support, Examples thereof include a method of transferring onto a substrate. Especially, the aspect which uses the composition for easily bonding layer formation from a point with easy manufacture is preferable.
Hereinafter, the aspect using the composition for easily bonding layer formation is explained in full detail.

One preferred embodiment of the easy-adhesion layer-forming composition includes an embodiment containing at least a curable polyurethane that becomes the polyurethane resin by a curing treatment, fine particles, and a surfactant. The definition of each component is as described above. That is, this easily bonding layer forming composition is a curable composition. In addition, it is preferable to adjust so that content of curable polyurethane, microparticles | fine-particles, and surfactant in the composition for easily bonding layer formation may become content of each component in the easily bonding layer mentioned above. .
The composition for easily bonding layer formation may contain the solvent as needed. Examples of the solvent include water and organic solvents, and a mixture of both may be used. Examples of the organic solvent include alcohols such as methanol, ketones such as acetone, amides such as formamide, sulfoxides such as dimethyl sulfoxide, esters such as ethyl acetate, ethers, and the like.

Moreover, the crosslinking agent may be contained in the composition for easily bonding layer formation. A crosslinking agent plays the role which bridge | crosslinks the said curable polyurethane. When a crosslinking agent is used, the easily adhesive layer formed has a crosslinked structure derived from a crosslinking agent (for example, a carbodiimide-based crosslinking agent or an oxazolidine-based crosslinking agent described later).
As the crosslinking agent, for example, an oxazoline-based crosslinking agent, a carbodiimide-based crosslinking agent, an epoxy-based crosslinking agent, an isocyanate-based crosslinking agent, or a melamine-based crosslinking agent (C ₃ N ₆ H ₆ ) is preferable, and a carbodiimide-based crosslinking agent or an oxazoline-based crosslinking agent. A carbodiimide type crosslinking agent is more preferable.
A carbodiimide-based crosslinking agent is a compound having a functional group represented by -N = C = N-. Polycarbodiimide is usually synthesized by a condensation reaction of organic diisocyanate, but the organic group of the organic diisocyanate used in this synthesis is not particularly limited, either aromatic or aliphatic, or a mixture thereof Can also be used. However, aliphatic systems are particularly preferred from the viewpoint of reactivity.
As a raw material for synthesis, organic isocyanate, organic diisocyanate, organic triisocyanate, and the like are used. As examples of organic isocyanates, aromatic isocyanates, aliphatic isocyanates, and mixtures thereof can be used. Specifically, 4,4′-diphenylmethane diisocyanate, 4,4-diphenyldimethylmethane diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hexamethylene diisocyanate, cyclohexane Diisocyanate, xylylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, 1,3-phenylene diisocyanate and the like are used. As the organic monoisocyanate, isophorone isocyanate, phenyl isocyanate, cyclohexyl isocyanate, butyl isocyanate, naphthyl isocyanate and the like are used.
The carbodiimide compound is also available as a commercial product such as Carbodilite V-02-L2 (Nisshinbo Co., Ltd.).

  The oxazoline-based crosslinking agent is a compound having an oxazoline group represented by the following formula (X).

As the oxazoline-based cross-linking agent, a polymer having an oxazoline group, for example, a polymerizable unsaturated monomer having an oxazoline group, if necessary, other polymerizable unsaturated monomers and known methods (for example, solution polymerization, Polymers obtained by copolymerization by emulsion polymerization or the like can also be used. Examples of the polymerizable unsaturated monomer having an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2- Examples include isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, and 2-isopropenyl-5-methyl-2-oxazoline. Two or more of these may be used in combination.
The oxazoline-based crosslinking agent may be a commercially available product such as Epocross K-2020E, Epocross K-2010E, Epocross K-2020E, Epocross K-2030E, Epocross WS-300, Epocross WS-500, Epocross WS-700, etc. Also available as Catalyst).

  The content of the crosslinking agent in the easy-adhesion layer-forming composition is not particularly limited, but is preferably 2.0 to 30.0 parts by mass, and 3.0 to 15.0 parts by mass with respect to 100 parts by mass of the curable polyurethane. Part is more preferred.

The method in particular of apply | coating the composition for easily bonding layer formation on a base material is not restrict | limited, Well-known coating methods, such as a gravure coater and a bar coater, can be utilized. The application timing may be an off-line coating method or an in-line coating method.
The application amount of the easy-adhesion layer-forming composition is not particularly limited, and is appropriately adjusted so that, for example, the easy-adhesion layer having the thickness described above can be obtained.
If necessary, the coating film obtained after coating may be subjected to a drying treatment in order to remove the solvent from the coating film. Examples of the drying process include heat treatment and air drying.
Next, the coating layer may be cured to form an easy adhesion layer. The method for the curing treatment is not particularly limited, but heat treatment is preferable. The heat treatment conditions are not particularly limited, but the heating temperature is preferably 50 to 150 ° C, more preferably 60 to 120 ° C, and the heating time is preferably 30 seconds to 5 minutes, more preferably 30 seconds to 3 minutes.
In addition, after forming an easily bonding layer, you may wind up the obtained optical film as needed.

<Application>
The optical film can be used in various applications, for example, an embodiment in which a conductive layer is disposed on an easy-adhesion layer and used as a conductive film, an embodiment used as a support for an antireflection film, and a surface protective film. The aspect etc. which are used as are mentioned.
The optical film of the present invention can be used for various display devices such as a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), and a cathode ray tube display device (CRT). The optical film of the present invention is preferably arranged on the viewing side of the display screen of the image display device.
Among the applications described above, the optical film of the present invention can be suitably used as a conductive film. Hereinafter, the aspect is explained in full detail.

A conductive film has the optical film mentioned above and the conductive layer arrange | positioned on the easily bonding layer in an optical film. As the conductive layer, higher transparency is preferable. That is, a transparent conductive layer is preferable.
The conductive layer may be formed in a layer shape, but is preferably formed so as to have an intermittent portion. An intermittent part means the part in which the conductive layer is not provided, and it is preferable that the outer periphery of an intermittent part is surrounded by the conductive layer. In the present invention, forming a conductive layer so as to have an intermittent portion is also referred to as forming a conductive layer in a pattern or mesh. Examples of the conductive layer include JP2013-1009A, JP2012-216550A, JP2012-151095A, JP2012-25158A, JP2011-253546A, and JP2011. -197754, JP2011-34806, JP2010-198799, JP2009-277466, JP2012-216550, JP2012-151095, International Publication 2010/140275. No. pamphlet and the conductive layer described in the international publication 2010/114056 pamphlet.

As a material constituting the conductive layer used in the present invention, either an organic material (for example, a conductive resin such as polythiophene) or an inorganic material (for example, a semiconductor such as ITO, a metal such as gold, silver, or copper) is used. It may be used and metal is more preferred.
Especially, it is more preferable that the conductive layer used in the present invention contains silver and a hydrophilic resin. Examples of the water-soluble resin include gelatin, polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), starch and other polysaccharides, cellulose and derivatives thereof, polyethylene oxide, polyvinylamine, chitosan, polylysine, polyacrylic acid, polyalginic acid, Examples include polyhyaluronic acid and carboxycellulose. These have neutral, anionic, and cationic properties depending on the ionicity of the functional group. Of these, gelatin is particularly preferred.

As the conductive layer used in the present invention, it is particularly preferable to use a layer derived from a silver halide photosensitive material. That is, the conductive layer of the conductive film of the present invention may be formed by exposing and developing a photosensitive material for a conductive layer (preferably a silver salt photosensitive material). When a silver halide photosensitive material is used, the method for producing a conductive layer includes the following three forms depending on the photosensitive material and the form of development processing.
(1) An embodiment in which a photosensitive silver halide black-and-white photosensitive material that does not contain physical development nuclei is chemically or thermally developed to form a metallic silver portion on the photosensitive material.
(2) A mode in which a photosensitive silver halide black and white photosensitive material containing physical development nuclei in a silver halide emulsion layer is dissolved and physically developed to form a metallic silver portion on the photosensitive material.
(3) A photosensitive silver halide black-and-white photosensitive material containing no physical development nuclei and an image receiving sheet having a non-photosensitive layer containing physical development nuclei are overlapped and developed by diffusion transfer, and the metallic silver portion is non-photosensitive image-receiving sheet. Form formed on top.
The chemical development, thermal development, dissolution physical development, and diffusion transfer development mentioned here have the same meanings as are commonly used in the industry, and are general textbooks of photographic chemistry such as Shinichi Kikuchi, “Photochemistry” (Kyoritsu Publishing) (Published in 1955), C.I. E. K. It is described in "The Theory of Photographic Processes, 4th ed." Edited by Mees (Mcmillan, 1977).

The optical film and conductive film of the present invention can be suitably used for touch panels.
The kind of the touch panel having the optical film or the conductive film of the present invention is not particularly limited and can be appropriately selected depending on the purpose. For example, a surface capacitive touch panel, a projected capacitive touch panel, a resistor Examples include membrane touch panels. The touch panel includes a so-called touch sensor and a touch pad. The layer structure of the touch panel sensor electrode part in the touch panel is a bonding method in which two transparent electrodes are bonded, a method in which transparent electrodes are provided on both surfaces of a single substrate, a single-sided jumper or a through-hole method, or a single-area layer method. But you can. In addition, the projected capacitive touch panel is preferably AC driven rather than DC driven, and more preferably is a drive method that requires less time to apply voltage to the electrodes.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these.

<Example 1>
(Preparation of easy-adhesion layer-forming composition (curable composition))
The following components were mixed to prepare an easily adhesive layer forming composition.
・ 29.64 parts by mass of curable polyurethane (Takelac WS5100, manufactured by Mitsui Chemicals, Ltd., concentration: 30% by mass)
-Carbodiimide type crosslinking agent 7.24 parts by mass (Carbodilite V-02-L2, manufactured by Nisshinbo Co., Ltd., solid content: 10% by mass)
-Oxazoline-based crosslinking agent 2.75 parts by mass (Epocross WS300, manufactured by Nippon Shokubai Co., Ltd., solid content: 10% by mass)
・ Colloidal silica 11.12 parts by mass
(Snowtex ZL, manufactured by Nissan Chemical Co., Ltd., solid content: 10% by weight water dilution)
・ Slip agent: Carnauba wax 13.85 parts by mass (Cerosol 524, manufactured by Chukyo Yushi Co., Ltd., solid content: 3% water dilution)
Surfactant: Anionic surfactant 23.30 parts by mass (Lapisol A-90, manufactured by NOF Corporation, solid content: 1% aqueous solution)
・ Surfactant: 14.58 parts by mass of nonionic surfactant (Naroacty CL95, manufactured by Sanyo Chemical Industries, solid content: 1% aqueous solution)
・ Distilled water 897.50 parts by mass

On one surface of ARTON D4540 (manufactured by JSR Co., Ltd., film thickness 40 μm), which is a cyclic olefin film used as a substrate, a corona discharge treatment was performed under the condition of 5 kJ / m ² .
The easy-adhesion layer-forming composition is applied to the surface of the base material subjected to corona discharge treatment so that the film thickness after drying is 50 nm and dried at 60 ° C. for 1 minute to have an easy-adhesion layer An optical film was obtained.
In addition, the film thickness (average thickness) of the easy adhesion layer of the film of each Example and Comparative Example was measured with an electronic micro film thickness meter manufactured by Anritsu Corporation.

(Lamination of AH layer and emulsion layer)
(Anti-halation (AH) layer)
A coating solution containing 84 g of the following solid disperse dye A per 100 g of gelatin was prepared. In addition, the contact angle of water with respect to the AH layer measured by conducting a separate experiment was 52 degrees.
・ Solid disperse dye A

(Silver halide photosensitive material)
For conductive layer containing silver bromoiodochloride grains (I = 0.2 mol%, Br = 40 mol%) containing 10.0 g of gelatin per 150 g of Ag in an aqueous medium and having an average sphere equivalent diameter of 0.1 μm An emulsion for a light-sensitive material was prepared. In this emulsion, K ₃ Rh ₂ Br ₉ and K ₂ IrCl ₆ were added so as to have a concentration of 10 ⁻⁷ (mol / mol silver), and silver bromide grains were doped with Rh ions and Ir ions. . Na ₂ PdCl ₄ was added to this emulsion, and gold sulfur was further sensitized with chloroauric acid and sodium thiosulfate.

(Film with photosensitive material for conductive layer)
Along with the gelatin hardener, the silver coating amount (coating silver amount) in the silver halide photosensitive material is 7 g / m ² in terms of silver, and the film thickness of the AH layer is 1 μm. On the produced optical film, simultaneous multilayer coating was performed so as to be in the order of the photosensitive material (silver halide photosensitive material) for the base material / adhesive layer / AH layer / conductive layer. At this time, the Ag / gelatin volume ratio in the photosensitive material for the conductive layer was 2/1. The film was applied to an optical film having a width of 30 cm for 20 m on an optical film having a width of 25 cm, and both ends were cut off by 3 cm so as to leave a central part of the coating, and an optical film with a photosensitive material for a roll-shaped conductive layer was obtained.

<Examples 2 to 10 and Comparative Examples 1 to 7>
Except that the base material used, binder, fine particles, ratio (average particle size of fine particles / thickness of easy-adhesion layer), surfactant type and amount used, and crosslinking agent type were changed according to Table 1. According to the same procedure as in Example 1, an optical film and an optical film with a photosensitive material were prepared.

<Evaluation>
The following various measurements were implemented using the optical film obtained by each Example and the comparative example, and the optical film with a photosensitive material.

(Dry scratch)
The optical film with a photosensitive material for a conductive layer produced in Examples and Comparative Examples was cut into a size of 12 cm × 3 cm. After being held for 1 hour under the conditions of 23 ° C. and 50% relative humidity, a scratch test was conducted. For the scratch test, a continuous load-type scratch strength tester (HEIDON-18 type, manufactured by Shinto Kagaku Co., Ltd.) was used to scratch a 10 cm length under the conditions of a sapphire needle of 0.2 mmφ and a load of 200 g. The presence or absence of peeling of the easy-adhesion layer, the AH layer, and the photosensitive material for the conductive layer disposed on the top was confirmed. The load when the film was peeled off was calculated with a load of 0 g when the film was peeled off by 10 cm and a load of 200 g when the film was not peeled off at all. A load of 50 g or more was judged to be a practical level.

(Wet scratch)
The optical film with the photosensitive material for the conductive layer produced in the examples and comparative examples was held in an oven at 50 ° C. for 32 hours. Then, it cut | judged to the size of 12 cm x 3 cm, immersed in distilled water of 24 degreeC for 2 minutes, and immediately after that, the scratch test was done before the film | membrane did not dry. For the scratch test, a continuous load-type scratch strength tester (HEIDON-18 type, manufactured by Shinto Kagaku Co., Ltd.) was used to scratch a 10 cm length under the conditions of a sapphire needle of 1.0 mmφ and a load of 200 g. The presence or absence of peeling of the easy-adhesion layer, the AH layer, and the photosensitive material for the conductive layer disposed on the top was confirmed. The load when the film was peeled off was calculated with a load of 0 g when the film was peeled off by 10 cm and a load of 200 g when the film was not peeled off at all. A load of 50 g or more was judged to be a practical level.

(Blocking resistance)
The optical film after forming the easy-adhesion layer was held for 1 hour under the conditions of 23 ° C. and 50% relative humidity, and then cut into two pieces of 3 cm × 3 cm. Two films were overlapped so that the easy-adhesion layer of one film was in contact with the easy-adhesion layer of the other film, and a load of 84 kg was applied for 21 hours at 30 ° C. and a relative humidity of 80%. The film was peeled off, and the following ranking was performed based on the feel when peeling and the appearance of the film after peeling. Those above B were judged to be at a practical level.
“A”: no adhesion, no adhesion mark “B”: adhesion, no adhesion mark “C”: adhesion, some adhesion marks “D”: adhesion, almost all adhesion marks

(Powder falling)
In a wear resistance tester (manufactured by Shinto Chemical Co., Ltd.), the drop-off property of particles was evaluated. Specifically, black paper (manufactured by FUJIFILM Corporation, SKBT3 90BIG0) is brought into contact with the easy-adhesion layer side of the optical film after the easy-adhesion layer is formed, and a load of 3 kg per 30 mm × 25 mm is applied. A distance of 10 cm was rubbed at 100 cm / min. After the rubbing test, the degree of powder falling was visually observed and evaluated according to the following evaluation criteria using the degree of powder falling as an index. Among these, the thing B or more was judged to be a practical use level.
“A”: no powder fall off “B”: powder fall was slightly observed, but there was no practical problem “C”: powder fall was seen

(Surface properties of easy-adhesion layer)
The surface state of the optical film after the easy-adhesion layer was formed was visually observed and evaluated according to the following evaluation criteria. Among these, the thing more than C was judged to be a practical use level. In addition, the following “unevenness” means a portion that looks different in color on the surface of the easy-adhesion layer observed when the easy-adhesion layer is visually observed, and “repellency” means the easy-adhesion layer on the substrate. The part where the substrate is not applied and the base material is exposed is intended.
“A”: There was almost no unevenness, and no repelling could be confirmed.
“B”: Almost no unevenness but repelling was observed in part (less than 10 pieces / m ² ).
“C”: Unevenness was observed, and repelling was observed in part (less than 10 / m ² ).
“D”: Unevenness was observed, and repellency was 10 or more / m ² .

In Table 1, the symbol in the “base material” column represents a trade name of each company shown below.
"ARTON": JSR Corporation
“ZENONR”: Nippon Zeon Co., Ltd.
"TOPAS": Polyplastics Co., Ltd.

In Table 1, WS5100, WS5000, WS4000, and WS6021 used as "binders" represent curable polyurethanes manufactured by Mitsui Chemicals, and SE1010 represents olefins manufactured by Unitika.
In Table 1, Snowtex ZL, Snowtex 50, and MP-4540M used as “fine particles” are manufactured by Nissan Chemical Industries, Ltd. “A / B” in the “fine particle” column means “average particle diameter of fine particle / thickness of easy-adhesion layer”.
In Table 1, “A” described in the “surfactant” column represents an anionic surfactant: Rapisol A-90, and “N” represents a nonionic surfactant: NAROACTY CL95. In the “Surfactant” column, “A + N” means that two types of surfactants (the mass ratio of A to N is 1.6: 1) were used. Furthermore, the mass (%) in the “surfactant” column represents the content of the surfactant relative to the total mass of the easy-adhesion layer.
In Table 1, “K” described in the “Crosslinking agent” column represents carbodiimide-based crosslinking agent: carbodilite V-02-L2, and “O” represents oxazoline-based crosslinking agent: Epocross WS300. In the “crosslinking agent” column, “K + O” means that two types of crosslinking agents (the mass ratio of K to O is 2.6: 1) were used. Furthermore, the mass (%) in the “crosslinking agent” column represents the content of the crosslinking agent relative to the resin mass.
In addition, although Tg of Table 1 shows Tg of the curable polyurethane used, Tg of the polyurethane resin in the easily bonding layer obtained by hardening reaction was also substantially the same.

As shown in Table 1, it was confirmed that the optical film of the present invention can achieve a desired effect.
In particular, it was confirmed from the comparison between Example 1 and Example 3 that the wet scratching was more excellent when the glass transition temperature of the polyurethane resin was 130 ° C. or lower.
Moreover, it was confirmed from the comparison with Example 1 and Example 4 that the more superior effect is acquired by using the anionic surfactant.
Further, from comparison between Examples 1, 5 and 6, when A / B (average particle diameter of fine particles / thickness of easy-adhesion layer) is 1.2 to 3.5, a more excellent effect can be obtained. confirmed.
Moreover, it was confirmed from the comparison of Example 1, 7 and 8 that a more excellent effect is acquired when a crosslinking agent is used.
On the other hand, Comparative Example 1 in which the polyurethane resin was not used, Comparative Example 2 in which the Tg of the polyurethane resin was not within the predetermined range, Comparative Example 3 in which the fine particles were not used, A / B (average particle diameter of fine particles / easy adhesion layer) In Comparative Examples 4 and 5 where the thickness) is not within the predetermined range, and Comparative Examples 6 and 7 where the surfactant content is not within the predetermined range, the desired effect was not obtained.

  By carrying out an exposure process and a development process on the optical film with the photosensitive material obtained in each of the above Examples, a patterned conductive layer could be formed on the easily adhesive layer.

Claims (10)

A base material made of a cyclic olefin resin;
Having an easy-adhesion layer disposed adjacent to the substrate;
The easy-adhesion layer includes a polyurethane resin having a glass transition temperature of 50 ° C. or higher, fine particles having an average particle size of 1.0 to 5.0 times the thickness of the easy-adhesion layer, and a surfactant.
Content of the said surfactant is 0.7-8.0 mass% with respect to the said easily bonding layer total mass,
An optical film , wherein the surfactant is a combination of an anionic surfactant and a nonionic surfactant, or is a nonionic surfactant . The optical film according to claim 1, wherein the surfactant is a combination of an anionic surfactant and a nonionic surfactant .   The optical film of Claim 1 or 2 whose thickness of the said easily bonding layer is 25-400 nm.   The optical film according to claim 1, wherein the fine particles are metal oxide fine particles.   The optical film according to any one of claims 1 to 4, wherein the easy-adhesion layer has at least one of a crosslinked structure derived from a carbodiimide-based crosslinking agent and a crosslinked structure derived from an oxazoline-based crosslinking agent.   The optical film of any one of Claims 1-5 whose glass transition temperature of the said polyurethane resin is 130 degrees C or less. The polyurethane resin is a resin obtained by curing curable polyurethane,
The optical film according to claim 1, wherein the curable polyurethane contains a silanol group.   The electroconductive film which has an optical film of any one of Claims 1-7, and a conductive layer.   A touch panel having the conductive film according to claim 8.   The display apparatus which has an optical film of any one of Claims 1-7.