WO2015178279A1 - Cyclic olefin resin composition film - Google Patents

Cyclic olefin resin composition film Download PDF

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Publication number
WO2015178279A1
WO2015178279A1 PCT/JP2015/063844 JP2015063844W WO2015178279A1 WO 2015178279 A1 WO2015178279 A1 WO 2015178279A1 JP 2015063844 W JP2015063844 W JP 2015063844W WO 2015178279 A1 WO2015178279 A1 WO 2015178279A1
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Prior art keywords
cyclic olefin
resin composition
composition film
styrene
film
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PCT/JP2015/063844
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French (fr)
Japanese (ja)
Inventor
健 細谷
堀井　明宏
慶 小幡
石森　拓
一樹 平田
宏士 須賀田
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デクセリアルズ株式会社
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Publication of WO2015178279A1 publication Critical patent/WO2015178279A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/10—Copolymers of styrene with conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes

Definitions

  • the present invention relates to a cyclic olefin resin composition film in which an elastomer or the like is added and dispersed in a cyclic olefin resin.
  • Cyclic olefin resin is an amorphous and thermoplastic olefin resin that has a cyclic olefin skeleton in its main chain, has excellent optical properties (transparency, low birefringence), low water absorption, It has excellent performance such as dimensional stability and high moisture resistance. Therefore, films or sheets made of cyclic olefin resins are expected to be developed for various optical applications such as retardation films, polarizing plate protective films, light diffusion plates, and moisture proof packaging applications such as pharmaceutical packaging and food packaging. Yes.
  • the cyclic olefin resin film with the elastomer added and dispersed is equivalent to general amorphous plastics and has a high coefficient of linear thermal expansion. Internal distortion occurred.
  • the present invention has been proposed in view of such conventional circumstances, and provides a cyclic olefin-based resin composition film having a low linear thermal expansion coefficient and excellent optical characteristics and toughness.
  • the present inventor improves the optical properties and toughness while maintaining a low linear thermal expansion coefficient by adding a styrene elastomer and inorganic oxide fine particles to the cyclic olefin resin and adjusting to a predetermined linear thermal expansion coefficient.
  • the present inventors have found that this can be done and have completed the present invention.
  • the cyclic olefin-based resin composition film according to the present invention contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and has a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less. It is characterized by being.
  • the method for producing a cyclic olefin-based resin composition film according to the present invention includes a cyclic olefin-based resin composition, a styrene-based elastomer, and inorganic oxide fine particles that are heated and melted. Is extruded into a film by an extrusion method to obtain a cyclic olefin-based resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less.
  • the cyclic olefin resin composition film according to the present invention is suitable for application to transparent conductive elements, input devices, display devices, and electronic devices.
  • the present invention contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and the linear thermal expansion coefficient is 40 ppm / ° C. or more and 60 ppm / ° C. or less, so that a low linear thermal expansion coefficient is obtained. Excellent optical properties and toughness can be obtained while maintaining the above.
  • FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment.
  • FIG. 2 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus.
  • 3A and 3B are cross-sectional views illustrating an example of a transparent conductive film
  • FIGS. 3C and 3D are cross-sectional views illustrating an example of a transparent conductive film provided with a moth-eye-shaped structure.
  • FIG. 4 is a schematic cross-sectional view showing a configuration example of the touch panel.
  • FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus.
  • 6A and 6B are external views illustrating examples of a digital camera as an electronic device.
  • FIG. 7 is an external view illustrating an example of a notebook personal computer as an electronic device.
  • FIG. 8 is an external view illustrating an example of a video camera as an electronic device.
  • FIG. 9 is an external view illustrating an example of a mobile phone as an electronic device.
  • FIG. 10 is an external view illustrating an example of a tablet computer as an electronic device.
  • FIG. 11 is a schematic cross-sectional view illustrating a deflection evaluation method.
  • the cyclic olefin-based resin composition film according to the present embodiment contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and has a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less. is there.
  • the linear thermal expansion coefficient represents a rate of change in length at which an object expands and contracts due to a temperature change, and is indicated by a strain per unit temperature.
  • the measurement method is performed in accordance with JISK7197, and is calculated as the average linear thermal expansion coefficient ⁇ (ppm / ° C.) at the test piece temperatures T1 to T2.
  • ⁇ ⁇ L / L0 ⁇ (T2-T1) (Where ⁇ : linear expansion coefficient, ⁇ L: (length of test piece at T2) ⁇ (length of test piece at T1), L0: length of test piece at T1)
  • FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment.
  • the cyclic olefin-based resin composition film contains a cyclic olefin-based resin 11, a styrene-based elastomer 12, and inorganic oxide fine particles 13.
  • the cyclic olefin-based resin composition film is, for example, a short film or sheet, the X-axis direction which is the width direction (TD: Transverse Direction), and the Y-axis direction which is the length direction (MD: Machine Direction), And a Z-axis direction that is a thickness direction.
  • the thickness Z of the cyclic olefin-based resin composition film is preferably 0.1 ⁇ m to 2 mm, more preferably 1 ⁇ m to 1 mm.
  • a dispersed phase (island phase) made of styrene elastomer 12 is dispersed in a matrix (sea phase) made of cyclic olefin resin 11.
  • the dispersed phase is dispersed with shape anisotropy in the MD direction by, for example, extrusion molding, has a major axis in the MD direction, and a minor axis in the TD direction.
  • the short axis dispersion diameter of the styrene elastomer 12 is 2 ⁇ m or less, more preferably 1 ⁇ m or less. If the minor axis dispersion diameter is too large, a gap is generated between the styrene elastomer / cyclic olefin resin due to the styrene elastomer phase change under environmental preservation, and the refractive index of the styrene elastomer itself changes, The haze of the entire film is greatly changed.
  • the short axis dispersion diameter means the size in the TD direction of the dispersed phase composed of the styrene elastomer 12 and can be measured as follows. First, the MD-thickness (Z-axis) cross section of the cyclic olefin-based resin composition film is cut. Then, the cross section of the film is magnified, the short axis of each dispersed phase in the predetermined range at the center of the cross section of the film is measured, and the average value is defined as the short axis dispersion diameter. Moreover, when a dispersion diameter is small, it is preferable to cut
  • the linear thermal expansion coefficient of the cyclic olefin-based resin composition film is 40 ppm / ° C. or more and 60 ppm / ° C. or less. As a result, excellent optical properties and toughness can be obtained while maintaining a low coefficient of linear thermal expansion.
  • the storage elastic modulus of the cyclic olefin-based resin composition film is preferably 1500 MPa or more and 2500 MPa or less, and particularly preferably 2000 MPa or less.
  • the storage elastic modulus of the cyclic olefin-based resin composition film comprising the cyclic olefin-based resin 11 and the styrene-based elastomer 12 is 1800 to 2200 MPa.
  • the addition of the inorganic oxide fine particles 13 decreases the storage elastic modulus. Even so, the tear strength can be maintained.
  • the cyclic olefin-based resin is a polymer compound having a main chain composed of carbon-carbon bonds and having a cyclic hydrocarbon structure in at least part of the main chain.
  • This cyclic hydrocarbon structure is introduced by using a compound (cyclic olefin) having at least one olefinic double bond in the cyclic hydrocarbon structure as represented by norbornene or tetracyclododecene as a monomer. Is done.
  • Cyclic olefin resins include cyclic olefin addition (co) polymers or hydrogenated products thereof (1), cyclic olefin and ⁇ -olefin addition copolymers or hydrogenated products (2), cyclic olefin ring-opening ( Co) polymers or hydrogenated products thereof (3).
  • cyclic olefin examples include: cyclopentene, cyclohexene, cyclooctene; one-ring cyclic olefin such as cyclopentadiene, 1,3-cyclohexadiene; bicyclo [2.2.1] hept-2-ene (common name: norbornene) ), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2.
  • Tricyclo [4.3.0.1 2,5 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.1 2,5 ] dec-3-ene; tricyclo [ 4.4.0.1 2,5 ] undeca-3,7-diene or tricyclo [4.4.0.1 2,5 ] undeca-3,8-diene or a partially hydrogenated product thereof (or cyclopentadiene) Tricyclo [4.4.0.1 2,5 ] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene A cyclic olefin of the ring;
  • Tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene also simply referred to as tetracyclododecene
  • 8-methyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene 8-ethyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene
  • 8-methylidenetetracyclo 4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene
  • 8-vinyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene 8-propenyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] tetracyclic olefins such as dodec-3-ene;
  • ⁇ -olefin copolymerizable with the cyclic olefin examples include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1- Hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc.
  • Examples thereof include 2 to 8 ethylene or ⁇ -olefin. These ⁇ -olefins can be used alone or in combination of two or more. As these ⁇ -olefins, those contained in the range of 5 to 200 mol% with respect to the cyclic polyolefin can be used.
  • an addition copolymer of ethylene and norbornene is preferably used as the cyclic olefin resin.
  • the structure of the cyclic olefin-based resin is not particularly limited, and may be a chain, branched, or crosslinked, but is preferably a straight chain.
  • the molecular weight of the cyclic olefin-based resin is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 15,000 to 100,000 according to the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.
  • the cyclic olefin resin has a polar group (for example, a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, etc.) in the above-mentioned cyclic olefin resins (1) to (3).
  • a polar group for example, a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, etc.
  • What (4) which grafted and / or copolymerized the unsaturated compound (u) which has can be included. Two or more of the above cyclic olefin resins (1) to (4) may be used in combination.
  • Examples of the unsaturated compound (u) include (meth) acrylic acid, maleic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1 to 10) ester, maleic acid Examples include alkyl (having 1 to 10 carbon atoms) ester, (meth) acrylamide, (2-hydroxyethyl) (meth) acrylate, and the like.
  • Affinity with metals and polar resins can be increased by using a modified cyclic olefin resin (4) obtained by grafting and / or copolymerizing an unsaturated compound (u) having a polar group, so vapor deposition, sputtering, coating It is possible to increase the strength of various secondary processing such as adhesion, and is suitable when secondary processing is required.
  • the presence of the polar group has a drawback of increasing the water absorption rate of the cyclic olefin resin.
  • the content of polar groups is preferably 0 to 1 mol / kg per 1 kg of cyclic olefin resin.
  • the styrenic elastomer is a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and / or a hydrogenated product thereof.
  • the styrene elastomer is a block copolymer having styrene as a hard segment and conjugated diene as a soft segment.
  • the structure of the soft segment changes the storage elastic modulus of the styrene-based elastomer, and the content of styrene that is the hard segment changes the refractive index and changes the haze of the entire film.
  • the styrene elastomer does not require a vulcanization step and is preferably used. Further, the hydrogenated one is more preferable because it has higher thermal stability.
  • styrenic elastomers examples include styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / propylene / styrene block copolymers. Examples thereof include styrene and butadiene block copolymers.
  • styrene / ethylene / butylene / styrene block copolymer styrene / ethylene / propylene / styrene block copolymer, styrene / butadiene block copolymer (hydrogenation) in which double bond of conjugated diene component is eliminated by hydrogenation May also be used.
  • the structure of the styrene-based elastomer is not particularly limited, and may be chain-like, branched or cross-linked, but is preferably linear in order to reduce the storage elastic modulus.
  • At least one styrene selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers.
  • Based elastomers are preferably used.
  • hydrogenated styrene / butadiene block copolymers are more preferably used because of high tear strength and small haze increase after environmental preservation.
  • the ratio of butadiene to styrene in the hydrogenated styrene / butadiene block copolymer is preferably in the range of 10 to 90 mol% so as not to impair the compatibility with the cyclic olefin resin.
  • the styrene content of the styrene elastomer is preferably 20 to 40 mol%. By setting the styrene content to 20 to 40 mol%, the haze can be reduced.
  • the molecular weight of the styrene elastomer is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 20,000 to 100,000, as determined by the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.
  • the addition amount of the styrene-based elastomer is preferably 5 vol% or more and 30 vol% or less. If the amount of styrene-based elastomer added is too large, the environmental preservation is reduced, and if it is too small, sufficient toughness cannot be obtained.
  • the inorganic oxide fine particles are preferably at least one selected from Al 2 O 3 , SiO 2 , ZrO 2 and TiO 2 . Since these inorganic oxide fine particles have a small linear thermal expansion coefficient, the linear thermal expansion coefficient of the cyclic olefin-based resin composition film can be reduced by addition.
  • the upper limit of the amount of inorganic oxide fine particles added is preferably less than 30 vol%, more preferably 20 vol% or less.
  • fine-particles it is preferable that it is 0.1 vol% or more, More preferably, it is 1.0 vol% or more, More preferably, it is 10 vol% or more. If the addition amount of the inorganic oxide fine particles is too large, the optical properties (haze, retardation) deteriorate, and if the addition amount is too small, it is difficult to reduce the linear expansion coefficient.
  • the average particle diameter of the inorganic oxide fine particles is preferably 50 nm or less, more preferably 5 nm or more and 10 nm or less. If the average particle size is too large, light scattering may occur and the sheet may be whitened, and the intended transparency may not be obtained. Moreover, when an average particle diameter is too small, addition will become substantially difficult.
  • the average particle diameter is, for example, the sum of the long axis length of fine particles (corresponding to the plate surface direction in the case of plate-like fine particles) and the short axis length (corresponding to the plate thickness direction in the case of plate-like fine particles) of 2
  • the divided value ((major axis + minor axis) / 2) is calculated for each particle, and can be an average value of 100 particles.
  • the inorganic oxide particles are produced by a gas phase method or a liquid phase method.
  • the vapor phase method can obtain a powder with relatively good dispersibility because a dry powder can be obtained directly.
  • the chemical flame method it is not suitable for industrial production because of its low mass production and high cost. Absent.
  • the liquid phase method crystal nuclei are generated and grown by a chemical reaction in a solution, followed by drying and firing processes. In order to produce fine particles, it is necessary to strictly control the production conditions so that the grains do not grow in each step.
  • the liquid phase method if the particles are agglomerated tightly at the time of drying, a large energy is required for dispersion, so it is most important not to agglomerate.
  • a method may be used in which the process proceeds directly to the dispersion step while leaving the liquid phase without passing through the drying and firing steps.
  • various compounding agents may be added to the cyclic olefin resin composition as necessary as long as the characteristics thereof are not impaired.
  • the various compounding agents are not particularly limited as long as they are usually used in thermoplastic resin materials.
  • antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, lubricants, antistatic agents, difficulty Examples include flame retardants, colorants such as dyes and pigments, near infrared absorbers, compounding agents such as fluorescent brighteners, and fillers.
  • the in-plane retardation R 0 can be 10 nm or less
  • the tear strength can be 60 N / mm or more
  • the haze can be 1.0% or less. If the tear strength is less than the above range, the film is liable to break during production or use, which is inappropriate. On the other hand, if the haze is too high, it deviates from the initial characteristics in use and does not satisfy the intended characteristics.
  • the method for producing a cyclic olefin-based resin composition film according to the present embodiment includes heating and melting a cyclic olefin-based resin composition, a styrene-based elastomer, and inorganic oxide fine particles. Extruded into a film by an extrusion method to obtain a cyclic olefin-based resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less.
  • the cyclic olefin-based resin composition film may be non-stretched, uniaxially stretched, or biaxially stretched.
  • FIG. 2 is a schematic diagram showing a configuration example of a film manufacturing apparatus.
  • the film manufacturing apparatus includes a die 21 and a roll 22.
  • the die 21 is a die for melt molding, and extrudes the molten resin material 23 into a film shape.
  • the resin material 23 contains the above-mentioned cyclic olefin resin composition, for example.
  • the roll 22 has a role of transporting the resin material 23 extruded from the die 21 into a film shape. Further, the roll 22 has a medium flow path therein, and the surface can be adjusted to an arbitrary temperature by an individual temperature control device.
  • the material of the surface of the roll 22 is not specifically limited, A metal rubber, resin, an elastomer, etc. can be used.
  • a cyclic olefin resin composition containing the above-mentioned cyclic olefin resin and a styrene elastomer is melt-mixed at a temperature in the range of 210 ° C to 300 ° C. The higher the melting temperature, the smaller the short axis dispersion diameter of the styrene elastomer.
  • the cyclic olefin-based resin composition film according to the present embodiment can be used for various optical applications, for example, a retardation film, a polarizing plate protective film, a light diffusion plate, etc., particularly a prism sheet and a liquid crystal cell substrate.
  • a retardation film for example, a retardation film, a polarizing plate protective film, a light diffusion plate, etc., particularly a prism sheet and a liquid crystal cell substrate.
  • FIGS. 3A and 3B are cross-sectional views showing an example of a transparent conductive film.
  • This transparent conductive film (transparent conductive element) is constituted by using the above-mentioned cyclic olefin-based resin composition film as a base film (base material).
  • this transparent conductive film includes a retardation film 31 as a base film (base material), and a transparent conductive layer 33 on at least one surface of the retardation film 31.
  • FIG. 3A is an example in which the transparent conductive layer 33 is provided on one surface of the retardation film 31
  • FIG. 3B is an example in which the transparent conductive layer 33 is provided on both surfaces of the retardation film 31.
  • a hard coat layer 32 may be further provided between the retardation film 31 and the transparent conductive layer 33.
  • the material of the transparent conductive layer 33 for example, one or more selected from the group consisting of electrically conductive metal oxide materials, metal materials, carbon materials, and conductive polymers can be used.
  • the metal oxide material include indium tin oxide (ITO) zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, gallium-added zinc oxide, silicon-added zinc oxide, and zinc oxide- Examples thereof include a tin oxide system, an indium oxide-tin oxide system, and a zinc oxide-indium oxide-magnesium oxide system.
  • metal material for example, metal nanofillers such as metal nanoparticles and metal nanowires can be used.
  • these materials include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, titanium, bismuth, Examples thereof include metals such as antimony and lead, and alloys thereof.
  • the carbon material include carbon black, carbon fiber, fullerene, graphene, carbon nanotube, carbon microcoil, and nanohorn.
  • the conductive polymer for example, substituted or unsubstituted polyaniline, polypyrrole, polythiofin, and one or two (co) polymers selected from these can be used.
  • the transparent conductive layer 33 may be a transparent electrode having a predetermined electrode pattern. Examples of the electrode pattern include a stripe shape, but are not limited thereto.
  • a photosensitive resin for example, acrylate resins such as urethane acrylate, epoxy acrylate, polyester acrylate, polyol acrylate, polyether acrylate, and melamine acrylate can be used.
  • the urethane acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting an acrylate or methacrylate monomer having a hydroxyl group with the obtained product.
  • the thickness of the hard coat layer 32 is preferably 1 ⁇ m to 20 ⁇ m, but is not particularly limited to this range.
  • the transparent conductive film is provided with a moth-eye structure 34 as an antireflection layer on at least one surface of the above-described retardation film. Also good.
  • FIG. 3C is an example in which a moth-eye structure 34 is provided on one surface of the retardation film 31, and FIG. 3D is an example in which a moth-eye structure is provided on both surfaces of the retardation film.
  • the antireflection layer provided on the surface of the retardation film 11 is not limited to the moth-eye structure described above, and a conventionally known antireflection layer such as a low refractive index layer can also be used. .
  • FIG. 4 is a schematic cross-sectional view showing one configuration example of the touch panel.
  • the touch panel (input device) 40 is a so-called resistive film type touch panel.
  • the resistive film type touch panel may be either an analog resistive film type touch panel or a digital resistive film type touch panel.
  • the touch panel 40 includes a first transparent conductive film 41 and a second transparent conductive film 42 facing the first transparent conductive film 41.
  • the 1st transparent conductive film 41 and the 2nd transparent conductive film 42 are bonded together via the bonding part 45 between those peripheral parts.
  • As the bonding part 45 for example, an adhesive paste, an adhesive tape or the like is used.
  • the touch panel 40 is bonded to the display device 44 through the bonding layer 43, for example.
  • a material of the bonding layer 43 for example, an acrylic, rubber, or silicon adhesive can be used, and an acrylic adhesive is preferable from the viewpoint of transparency.
  • the touch panel 40 further includes a polarizer 48 bonded to the surface on the touch side of the first transparent conductive film 41 via a bonding layer 50 or the like.
  • a polarizer 48 bonded to the surface on the touch side of the first transparent conductive film 41 via a bonding layer 50 or the like.
  • the 1st transparent conductive film 41 and / or the 2nd transparent conductive film 42 the above-mentioned transparent conductive film can be used.
  • the retardation film as the base film (base material) is set to ⁇ / 4.
  • the touch panel 40 is preferably provided with a moth-eye structure 34 on the opposing surfaces of the first transparent conductive film 41 and the second transparent conductive film 42, that is, on the surface of the transparent conductive layer 33.
  • the optical characteristics for example, a reflection characteristic, a transmission characteristic, etc.
  • the touch panel 40 preferably further includes a single-layer or multi-layer antireflection layer on the surface of the first transparent conductive film 41 on the touch side. Thereby, a reflectance can be reduced and visibility can be improved.
  • the touch panel 40 further includes a hard coat layer on the surface on the touch side of the first transparent conductive film 41 from the viewpoint of improving the scratch resistance.
  • the surface of the hard coat layer is preferably imparted with antifouling properties.
  • the touch panel 40 further includes a front panel (surface member) 49 bonded to the surface on the touch side of the first transparent conductive film 41 via the bonding layer 51. Moreover, it is preferable that the touch panel 40 further includes a glass substrate 46 bonded to the surface of the second transparent conductive film 42 bonded to the display device 44 via a bonding layer 47.
  • the touch panel 40 preferably further includes a plurality of structures on the surface to be bonded to the display device 44 of the second transparent conductive film 42 or the like.
  • the adhesion between the touch panel 40 and the bonding layer 43 can be improved by the anchor effect of the plurality of structures.
  • a moth-eye structure is preferable. Thereby, interface reflection can be suppressed.
  • a liquid crystal display for example, a CRT (Cathode Ray Tube) display, a plasma display (Plasma Display Panel: PDP), an electroluminescence (Electro Luminescence: EL) display, a surface conduction electron-emitting device display (Surface-conduction Various display devices such as Electron-emitter Display (SED) can be used.
  • a CRT Cathode Ray Tube
  • a plasma display Plasma Display Panel: PDP
  • an electroluminescence (Electro Luminescence: EL) display for example, a liquid crystal display, a CRT (Cathode Ray Tube) display, a plasma display (Plasma Display Panel: PDP), an electroluminescence (Electro Luminescence: EL) display, a surface conduction electron-emitting device display (Surface-conduction
  • SED Electron-emitter Display
  • FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus.
  • the television device 100 includes a display unit 101, and the display unit 101 includes a touch panel 40.
  • FIG. 6A and 6B are external views illustrating examples of a digital camera as an electronic device.
  • 6A is an external view of the digital camera viewed from the front side
  • FIG. 6B is an external view of the digital camera viewed from the back side.
  • the digital camera 110 includes a light emitting unit 111 for flash, a display unit 112, a menu switch 113, a shutter button 114, and the like, and the display unit 112 includes the touch panel 40 described above.
  • FIG. 7 is an external view showing an example of a notebook personal computer as an electronic device.
  • the notebook personal computer 120 includes a main body 121 including a keyboard 122 for inputting characters, a display unit 123 for displaying images, and the like, and the display unit 123 includes the touch panel 40 described above.
  • FIG. 8 is an external view showing an example of a video camera as an electronic device.
  • the video camera 130 includes a main body 131, a subject shooting lens 132 on the side facing forward, a start / stop switch 133 during shooting, a display unit 134, and the like, and the display unit 134 includes the touch panel 40 described above.
  • FIG. 9 is an external view showing an example of a mobile phone as an electronic device.
  • the mobile phone 140 is a so-called smartphone, and the display unit 141 includes the touch panel 40 described above.
  • FIG. 10 is an external view showing an example of a tablet computer as an electronic device.
  • the tablet computer 150 includes the touch panel 40 described above on the display unit 151.
  • the linear thermal expansion coefficient, retardation, tear strength, and initial haze of the cyclic olefin-based resin composition film were measured as follows.
  • the linear thermal expansion coefficient was calculated based on JISK7197 using a thermomechanical analyzer (TMA: Thermomechanical Analysis, TMA4100SA manufactured by NETZSCH Japan).
  • TMA thermomechanical analyzer
  • a test piece of 4 ⁇ 10 mm was produced from a film having a thickness of 0.2 to 0.3 mm, and the average linear thermal expansion coefficient (ppm / ° C.) at a temperature of 0 ° C. to 200 ° C. was measured. It calculated in.
  • a film having a thickness of 80 ⁇ m was measured according to JISK7128.
  • a No. 3 type test piece was used as a test piece, measured at a test speed of 200 mm / min using a tensile tester (AG-X, manufactured by Shimadzu Corporation), and the average value in the MD and TD directions was determined as the tear strength. did.
  • a tear strength of 60 N / mm or more was evaluated as “ ⁇ ”, and a tear strength of less than 60 N / mm was evaluated as “x”. If the tear strength is 60 N / mm or more, practical use is possible in that the risk of breakage in a subsequent process such as a coating process is reduced.
  • Cyclic olefin resin, styrene elastomer, and inorganic oxide fine particles As the cyclic olefin-based resin, TOPAS 6013-S04 (manufactured by Polyplastics Co., Ltd., an addition copolymer of ethylene and norbornene) was used.
  • Tuftec H1041 manufactured by Asahi Kasei Chemicals Corporation, styrene / ethylene / butylene / styrene block copolymer was used.
  • Al 2 O 3 (aluminum oxide ( ⁇ type)): coefficient of linear thermal expansion 7.2 ppm / ° C., average particle size 5 nm, manufactured by IoLiTec SiO 2 (silicon dioxide): coefficient of linear thermal expansion 0.7 ppm / ° C., average particle Diameter 15 nm, IoLiTec ZrO 2 (zirconium oxide): linear thermal expansion coefficient 10.5 ppm / ° C., average particle size 40 nm, IoLiTec TiO 2 (titanium oxide): linear thermal expansion coefficient 7.1 ppm / ° C., average particle Diameter 20nm, made by Ishihara Sangyo
  • Example 1 A twin-screw extruder containing 80 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as a styrene elastomer and 10 vol% of Al 2 O 3 as inorganic oxide fine particles, and a T-die attached to the tip (specifications: And kneading at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a diameter of 25 mm, length: 26D, T die width: 160 mm), and then extruding the cyclic olefin resin composition at a speed of 250 g / min. A film having a thickness of 80 ⁇ m was wound on a roll.
  • the styrenic elastomer is dispersed with shape anisotropy in the MD direction of the film, has an average major axis of about 4 ⁇ m in the MD direction, and an average minor axis of about 0.2 ⁇ m in the TD direction. Had.
  • the linear thermal expansion coefficient of the film is 47 ppm / ° C.
  • the retardation R 0 is an evaluation of ⁇ at 4.7 nm
  • the tear strength is an evaluation of ⁇ at 81 N / mm
  • the initial haze is The evaluation was ⁇ at 0.5%.
  • Example 2 A film having a thickness of 80 ⁇ m in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as styrene elastomer, and 20 vol% of Al 2 O 3 as inorganic oxide fine particles were blended. Was made.
  • the coefficient of linear thermal expansion of the film is 43 ppm / ° C.
  • the retardation R 0 is 4.7 nm
  • the tear strength is 72 N / mm
  • the initial haze is The evaluation was ⁇ at 0.6%.
  • Example 3 A film having a thickness of 80 ⁇ m was prepared in the same manner as in Example 1 except that 80 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 10 vol% of SiO 2 as inorganic oxide fine particles were blended. did.
  • the linear thermal expansion coefficient of the film is 46 ppm / ° C.
  • the retardation R 0 is 4.6 nm
  • the tear strength is 81 N / mm
  • the initial haze is The evaluation was ⁇ at 0.5%.
  • Example 4 A film having a thickness of 80 ⁇ m is prepared in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 20 vol% of SiO 2 as inorganic oxide fine particles are blended. did.
  • the linear thermal expansion coefficient of the film is 41 ppm / ° C.
  • the retardation R 0 is 4.6 nm
  • the tear strength is 72 N / mm
  • the initial haze is The evaluation was ⁇ at 0.6%.
  • Example 5 A film having a thickness of 80 ⁇ m is prepared in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 20 vol% of ZrO 2 as inorganic oxide fine particles are blended. did.
  • the linear thermal expansion coefficient of the film is 43 ppm / ° C.
  • the retardation R 0 is 5.3
  • the evaluation is ⁇ .
  • the tear strength is 72 N / mm
  • the initial haze is The evaluation was ⁇ at 0.6%.
  • Example 6 A film having a thickness of 80 ⁇ m is prepared in the same manner as in Example 1 except that 70 vol% of the cyclic olefin resin, 10 vol% of Tuftec H1041 as the styrene elastomer, and 20 vol% of TiO 2 as the inorganic oxide fine particles are blended. did.
  • the coefficient of linear thermal expansion of the film is 43 ppm / ° C.
  • the retardation R 0 is an evaluation of ⁇ at 5.0 nm
  • the tear strength is an evaluation of ⁇ at 72 N / mm
  • the initial haze is The evaluation was ⁇ at 0.6%.
  • Example 1 A film having a thickness of 80 ⁇ m was produced in the same manner as in Example 1 except that 100 vol% of the cyclic olefin resin was blended.
  • the linear thermal expansion coefficient of the film is 65 ppm / ° C.
  • the retardation R 0 is 0.4 nm
  • the tear strength is 55 N / mm
  • the initial haze is The evaluation was ⁇ at 0.2%.
  • Example 2 A film having a thickness of 80 ⁇ m was prepared in the same manner as in Example 1 except that 90 vol% of the cyclic olefin resin and 10 vol% of Tuftec H1041 as a styrene elastomer were blended.
  • the coefficient of linear thermal expansion of the film is 62 ppm / ° C.
  • the retardation R 0 is 2.0 nm
  • the evaluation is ⁇
  • the tear strength is 90 N / mm
  • the initial haze is The evaluation was ⁇ at 0.5%.
  • Example 3 A film having a thickness of 80 ⁇ m in the same manner as in Example 1 except that 60 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as styrene elastomer, and 30 vol% of Al 2 O 3 as inorganic oxide fine particles were blended. Was made.
  • the linear thermal expansion coefficient of the film is 38 ppm / ° C.
  • the retardation R 0 is an evaluation of ⁇ at 4.7 nm
  • the tear strength is an evaluation of ⁇ at 63 N / mm
  • the initial haze is The evaluation was x at 2.8%.
  • Example 4 A film having a thickness of 80 ⁇ m was prepared in the same manner as in Example 1 except that 60 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 30 vol% of SiO 2 as inorganic oxide fine particles were blended. did.
  • the linear thermal expansion coefficient of the film is 38 ppm / ° C.
  • the retardation R 0 is 4.5 nm
  • the tear strength is 63 N / mm
  • the initial haze is The evaluation was x at 3.4%.
  • Comparative Example 1 had a tear strength of less than 60 N / mm because no styrene elastomer was added.
  • Comparative Example 2 since the inorganic oxide fine particles are not added, the linear thermal expansion coefficient does not decrease.
  • Comparative Examples 3 and 4 in which the amount of inorganic oxide fine particles added is 30 vol% is very preferable when the linear thermal expansion coefficient is less than 40 ppm / ° C., but the initial haze exceeds 1.5%, It was difficult to use.
  • Examples 1 to 6 contain a cyclic olefin resin, a styrene elastomer, and inorganic oxide fine particles, the linear thermal expansion coefficient is lowered to 40 ppm / ° C. or more and 60 ppm / ° C. or less, and the in-plane direction is reduced.
  • the retardation R 0 was 10 nm or less
  • the tear strength was 60 N / mm or more
  • the haze was 1.0% or less.
  • the addition amount of the inorganic oxide fine particles is less than 30 vol%, thereby suppressing the aggregation of the inorganic oxide fine particles and preventing the initial haze from increasing. I found out that I could do it.
  • the PET film 170 was arrange

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Abstract

Provided is a cyclic olefin resin composition film which has a low linear thermal expansion coefficient, while having excellent optical characteristics and excellent toughness. This cyclic olefin resin composition film contains a cyclic olefin resin (11), a styrene elastomer (12) and inorganic oxide fine particles (13), and has a linear thermal expansion coefficient of from 40 ppm/°C to 60 ppm/°C (inclusive). Consequently, this cyclic olefin resin composition film is able to achieve excellent optical characteristics and toughness, while maintaining a low linear thermal expansion coefficient.

Description

環状オレフィン系樹脂組成物フィルムCyclic olefin resin composition film
　本発明は、環状オレフィン系樹脂にエラストマー等を添加分散させた環状オレフィン系樹脂組成物フィルムに関する。 The present invention relates to a cyclic olefin resin composition film in which an elastomer or the like is added and dispersed in a cyclic olefin resin.
　環状オレフィン系樹脂は、その主鎖に環状のオレフィン骨格を持った非晶性で熱可塑性のオレフィン系樹脂であり、優れた光学特性（透明性、低複屈折性）を持ち、低吸水性とそれに基づく寸法安定性、高防湿性といった、優れた性能を有している。そのため環状オレフィン系樹脂からなるフィルムもしくはシートは、各種光学用途、例えば位相差フィルム、偏光板保護フィルム、光拡散板等や、防湿包装用途、例えば医薬品包装、食品包装等への展開が期待されている。 Cyclic olefin resin is an amorphous and thermoplastic olefin resin that has a cyclic olefin skeleton in its main chain, has excellent optical properties (transparency, low birefringence), low water absorption, It has excellent performance such as dimensional stability and high moisture resistance. Therefore, films or sheets made of cyclic olefin resins are expected to be developed for various optical applications such as retardation films, polarizing plate protective films, light diffusion plates, and moisture proof packaging applications such as pharmaceutical packaging and food packaging. Yes.
　環状オレフィン系樹脂のフィルムは、靭性に劣るため、ハードセグメンとソフトセグメントを有するエラストマー等を添加分散することにより、靱性を改善することが知られている（例えば、特許文献１参照。）。 Since the film of cyclic olefin resin is inferior in toughness, it is known to improve toughness by adding and dispersing an elastomer having a hard segment and a soft segment (for example, see Patent Document 1).
　しかしながら、エラストマーを添加分散した環状オレフィン系樹脂のフィルムは、一般的な非晶質プラスチックと同等であり、線熱膨張係数が高いため、ガラス等の無機物と貼り合わせた場合、温度変化により、カール、内部歪み等が発生していた。 However, the cyclic olefin resin film with the elastomer added and dispersed is equivalent to general amorphous plastics and has a high coefficient of linear thermal expansion. Internal distortion occurred.
特開２００４－１５６０４８号公報JP 2004-156048 A
　本発明は、このような従来の実情に鑑みて提案されたものであり、線熱膨張係数が低く、優れた光学特性及び靱性を有する環状オレフィン系樹脂組成物フィルムを提供する。 The present invention has been proposed in view of such conventional circumstances, and provides a cyclic olefin-based resin composition film having a low linear thermal expansion coefficient and excellent optical characteristics and toughness.
　本発明者は、環状オレフィン系樹脂にスチレン系エラストマー及び無機酸化物微粒子を添加し、所定の線熱膨張係数に調整することにより、低い線熱膨張係数を保ったまま、光学特性及び靱性を改善できることを見出し、本発明を完成するに至った。 The present inventor improves the optical properties and toughness while maintaining a low linear thermal expansion coefficient by adding a styrene elastomer and inorganic oxide fine particles to the cyclic olefin resin and adjusting to a predetermined linear thermal expansion coefficient. The present inventors have found that this can be done and have completed the present invention.
　すなわち、本発明に係る環状オレフィン系樹脂組成物フィルムは、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを含有し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下であることを特徴とする。 That is, the cyclic olefin-based resin composition film according to the present invention contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and has a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less. It is characterized by being.
　また、本発明に係る環状オレフィン系樹脂組成物フィルムの製造方法は、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを加熱溶融し、前記加熱溶融された環状オレフィン系樹脂組成物を押出法により、フィルム状に押し出し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である環状オレフィン系樹脂組成物フィルムを得ることを特徴とする。 The method for producing a cyclic olefin-based resin composition film according to the present invention includes a cyclic olefin-based resin composition, a styrene-based elastomer, and inorganic oxide fine particles that are heated and melted. Is extruded into a film by an extrusion method to obtain a cyclic olefin-based resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less.
　また、本発明に係る環状オレフィン系樹脂組成物フィルムは、透明導電性素子、入力装置、表示装置、及び電子機器に適用して好適なものである。 Also, the cyclic olefin resin composition film according to the present invention is suitable for application to transparent conductive elements, input devices, display devices, and electronic devices.
　本発明によれば、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを含有し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下であることにより、低い線熱膨張係数を保ったまま、優れた光学特性及び靱性を得ることができる。 According to the present invention, it contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and the linear thermal expansion coefficient is 40 ppm / ° C. or more and 60 ppm / ° C. or less, so that a low linear thermal expansion coefficient is obtained. Excellent optical properties and toughness can be obtained while maintaining the above.
図１は、本実施の形態に係る環状オレフィン系樹脂組成物フィルムの概略を示す断面斜視図である。FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment. 図２は、フィルム製造装置の一構成例を示す模式図である。FIG. 2 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus. 図３Ａ及び図３Ｂは、透明導電性フィルムの一例を示す断面図であり、図３Ｃ及び図３Ｄは、モスアイ形状の構造体を設けた透明導電性フィルムの一例を示す断面図である。3A and 3B are cross-sectional views illustrating an example of a transparent conductive film, and FIGS. 3C and 3D are cross-sectional views illustrating an example of a transparent conductive film provided with a moth-eye-shaped structure. 図４は、タッチパネルの一構成例を示す概略断面図である。FIG. 4 is a schematic cross-sectional view showing a configuration example of the touch panel. 図５は、電子機器としてテレビ装置の例を示す外観図である。FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus. 図６Ａ及び図６Ｂは、電子機器としてデジタルカメラの例を示す外観図である。6A and 6B are external views illustrating examples of a digital camera as an electronic device. 図７は、電子機器としてノート型パーソナルコンピュータの例を示す外観図である。FIG. 7 is an external view illustrating an example of a notebook personal computer as an electronic device. 図８は、電子機器としてビデオカメラの例を示す外観図である。FIG. 8 is an external view illustrating an example of a video camera as an electronic device. 図９は、電子機器として携帯電話の一例を示す外観図である。FIG. 9 is an external view illustrating an example of a mobile phone as an electronic device. 図１０は、電子機器としてタブレット型コンピュータの一例を示す外観図である。FIG. 10 is an external view illustrating an example of a tablet computer as an electronic device. 図１１は、たわみの評価方法を示す概略断面図である。FIG. 11 is a schematic cross-sectional view illustrating a deflection evaluation method.
　以下、本発明の実施の形態について、図面を参照しながら下記順序にて詳細に説明する。
１．環状オレフィン系樹脂組成物フィルム
２．環状オレフィン系樹脂組成物フィルムの製造方法
３．電子機器への適用例
４．実施例 Hereinafter, embodiments of the present invention will be described in detail in the following order with reference to the drawings.
1. 1. Cyclic olefin resin composition film 2. Production method of cyclic olefin-based resin composition film 3. Application example to electronic equipment Example
　＜１．環状オレフィン系樹脂組成物フィルム＞
　本実施の形態に係る環状オレフィン系樹脂組成物フィルムは、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを含有し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である。 <1. Cyclic Olefin Resin Composition Film>
The cyclic olefin-based resin composition film according to the present embodiment contains a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles, and has a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less. is there.
　ここで、線熱膨張係数とは、物体が温度変化によって、膨張、収縮する長さの変化割合を表し、単位温度当たりの歪で示される。その測定方法は、ＪＩＳＫ７１９７に準拠して行われ、試験片の温度Ｔ１～Ｔ２における平均の線熱膨張率α（ｐｐｍ／℃）として算出される。
α＝ΔＬ／Ｌ０×（Ｔ２－Ｔ１）
（式中、α：線膨張率、ΔＬ：（Ｔ２での試験片の長さ）－（Ｔ１での試験片の長さ）、Ｌ０：Ｔ１での試験片の長さである。） Here, the linear thermal expansion coefficient represents a rate of change in length at which an object expands and contracts due to a temperature change, and is indicated by a strain per unit temperature. The measurement method is performed in accordance with JISK7197, and is calculated as the average linear thermal expansion coefficient α (ppm / ° C.) at the test piece temperatures T1 to T2.
α = ΔL / L0 × (T2-T1)
(Where α: linear expansion coefficient, ΔL: (length of test piece at T2) − (length of test piece at T1), L0: length of test piece at T1)
　図１は、本実施の形態に係る環状オレフィン系樹脂組成物フィルムの概略を示す断面斜視図である。図１に示すように、環状オレフィン系樹脂組成物フィルムは、環状オレフィン系樹脂１１と、スチレン系エラストマー１２と、無機酸化物微粒子１３とを含有する。 FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment. As shown in FIG. 1, the cyclic olefin-based resin composition film contains a cyclic olefin-based resin 11, a styrene-based elastomer 12, and inorganic oxide fine particles 13.
　環状オレフィン系樹脂組成物フィルムは、例えば短形状のフィルム又はシートであり、幅方向（ＴＤ：Transverse Direction）であるＸ軸方向と、長さ方向（ＭＤ：Machine Direction）であるＹ軸方向と、厚さ方向であるＺ軸方向とを有する。環状オレフィン系樹脂組成物フィルムの厚さＺは、０．１μｍ～２ｍｍであることが好ましく、より好ましくは１μｍ～１ｍｍである。 The cyclic olefin-based resin composition film is, for example, a short film or sheet, the X-axis direction which is the width direction (TD: Transverse Direction), and the Y-axis direction which is the length direction (MD: Machine Direction), And a Z-axis direction that is a thickness direction. The thickness Z of the cyclic olefin-based resin composition film is preferably 0.1 μm to 2 mm, more preferably 1 μm to 1 mm.
　また、図１に示すように、環状オレフィン系樹脂組成物フィルムは、環状オレフィン系樹脂１１からなるマトリックス（海相）中にスチレン系エラストマー１２からなる分散相（島相）が分散している。分散相は、例えば押出成型によりＭＤ方向に形状異方性を持って分散し、ＭＤ方向に長軸を有し、ＴＤ方向に短軸を有する。 Further, as shown in FIG. 1, in the cyclic olefin resin composition film, a dispersed phase (island phase) made of styrene elastomer 12 is dispersed in a matrix (sea phase) made of cyclic olefin resin 11. The dispersed phase is dispersed with shape anisotropy in the MD direction by, for example, extrusion molding, has a major axis in the MD direction, and a minor axis in the TD direction.
　スチレン系エラストマー１２の短軸分散径は、２μｍ以下であり、より好ましくは１μｍ以下である。短軸分散径が大きすぎると、環境保存下において、スチレン系エラストマー相変化により、スチレン系エラストマー／環状オレフィン系樹脂間に隙間が発生し、スチレン系エラストマー自体の屈折率が変化し、結果として、フィルム全体のヘイズを大きく変化させてしまう。 The short axis dispersion diameter of the styrene elastomer 12 is 2 μm or less, more preferably 1 μm or less. If the minor axis dispersion diameter is too large, a gap is generated between the styrene elastomer / cyclic olefin resin due to the styrene elastomer phase change under environmental preservation, and the refractive index of the styrene elastomer itself changes, The haze of the entire film is greatly changed.
　なお、本明細書において、短軸分散径とは、スチレン系エラストマー１２からなる分散相のＴＤ方向の大きさを意味し、次のように測定することができる。先ず、環状オレフィン系樹脂組成物フィルムのＭＤ－厚み（Ｚ軸）断面を切断する。そして、フィルム断面を拡大観察し、フィルム断面中央の所定範囲の各分散相の短軸を計測し、その平均値を短軸分散径とする。また、分散径が小さい場合は、フィルムに対してオスミウム染色を施した後、切断することが好ましい。 In the present specification, the short axis dispersion diameter means the size in the TD direction of the dispersed phase composed of the styrene elastomer 12 and can be measured as follows. First, the MD-thickness (Z-axis) cross section of the cyclic olefin-based resin composition film is cut. Then, the cross section of the film is magnified, the short axis of each dispersed phase in the predetermined range at the center of the cross section of the film is measured, and the average value is defined as the short axis dispersion diameter. Moreover, when a dispersion diameter is small, it is preferable to cut | disconnect, after giving osmium dyeing | staining with respect to a film.
　また、環状オレフィン系樹脂組成物フィルムの線熱膨張係数は、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である。これにより、低い線熱膨張係数を保ったまま、優れた光学特性及び靱性を得ることができる。 Moreover, the linear thermal expansion coefficient of the cyclic olefin-based resin composition film is 40 ppm / ° C. or more and 60 ppm / ° C. or less. As a result, excellent optical properties and toughness can be obtained while maintaining a low coefficient of linear thermal expansion.
　また、環状オレフィン系樹脂組成物フィルムの貯蔵弾性率は、１５００ＭＰａ以上２５００ＭＰａ以下が好ましく、特に２０００ＭＰａ以下であることが好ましい。環状オレフィン系樹脂１１とスチレン系エラストマー１２とからなる環状オレフィン系樹脂組成物フィルムの貯蔵弾性率は、１８００～２２００ＭＰａであるが、無機酸化物微粒子１３を添加することにより、貯蔵弾性率が低下しても、引き裂き強度を保つことができる。 The storage elastic modulus of the cyclic olefin-based resin composition film is preferably 1500 MPa or more and 2500 MPa or less, and particularly preferably 2000 MPa or less. The storage elastic modulus of the cyclic olefin-based resin composition film comprising the cyclic olefin-based resin 11 and the styrene-based elastomer 12 is 1800 to 2200 MPa. However, the addition of the inorganic oxide fine particles 13 decreases the storage elastic modulus. Even so, the tear strength can be maintained.
　以下、環状オレフィン系樹脂１１、スチレン系エラストマー１２、及び無機酸化物粒子１３について、詳細に説明する。 Hereinafter, the cyclic olefin resin 11, the styrene elastomer 12, and the inorganic oxide particles 13 will be described in detail.
　［環状オレフィン系樹脂］
　環状オレフィン系樹脂は、主鎖が炭素－炭素結合からなり、主鎖の少なくとも一部に環状炭化水素構造を有する高分子化合物である。この環状炭化水素構造は、ノルボルネンやテトラシクロドデセンに代表されるような、環状炭化水素構造中に少なくとも一つのオレフィン性二重結合を有する化合物（環状オレフィン）を単量体として用いることで導入される。 [Cyclic olefin resin]
The cyclic olefin-based resin is a polymer compound having a main chain composed of carbon-carbon bonds and having a cyclic hydrocarbon structure in at least part of the main chain. This cyclic hydrocarbon structure is introduced by using a compound (cyclic olefin) having at least one olefinic double bond in the cyclic hydrocarbon structure as represented by norbornene or tetracyclododecene as a monomer. Is done.
　環状オレフィン系樹脂は、環状オレフィンの付加（共）重合体又はその水素添加物（１）、環状オレフィンとα－オレフィンの付加共重合体又はその水素添加物（２）、環状オレフィンの開環（共）重合体又はその水素添加物（３）に分類される。 Cyclic olefin resins include cyclic olefin addition (co) polymers or hydrogenated products thereof (1), cyclic olefin and α-olefin addition copolymers or hydrogenated products (2), cyclic olefin ring-opening ( Co) polymers or hydrogenated products thereof (3).
　環状オレフィンの具体例としては、シクロペンテン、シクロヘキセン、シクロオクテン；シクロペンタジエン、１，３－シクロヘキサジエン等の１環の環状オレフィン；ビシクロ［２．２．１］ヘプタ－２－エン（慣用名：ノルボルネン）、５－メチル－ビシクロ［２．２．１］ヘプタ－２－エン、５，５－ジメチル－ビシクロ［２．２．１］ヘプタ－２－エン、５－エチル－ビシクロ［２．２．１］ヘプタ－２－エン、５－ブチル－ビシクロ［２．２．１］ヘプタ－２－エン、５－エチリデン－ビシクロ［２．２．１］ヘプタ－２－エン、５－ヘキシル－ビシクロ［２．２．１］ヘプタ－２－エン、５－オクチル－ビシクロ［２．２．１］ヘプタ－２－エン、５－オクタデシル－ビシクロ［２．２．１］ヘプタ－２－エン、５－メチリデン－ビシクロ［２．２．１］ヘプタ－２－エン、５－ビニル－ビシクロ［２．２．１］ヘプタ－２－エン、５－プロペニル－ビシクロ［２．２．１］ヘプタ－２－エン等の２環の環状オレフィン； Specific examples of the cyclic olefin include: cyclopentene, cyclohexene, cyclooctene; one-ring cyclic olefin such as cyclopentadiene, 1,3-cyclohexadiene; bicyclo [2.2.1] hept-2-ene (common name: norbornene) ), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2. 1] Hept-2-ene, 5-butyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-hexyl-bicyclo [ 2.2.1] hept-2-ene, 5-octyl-bicyclo [2.2.1] hept-2-ene, 5-octadecyl-bicyclo [2.2.1] hept-2-ene, 5- Metilide -Bicyclo [2.2.1] hept-2-ene, 5-vinyl-bicyclo [2.2.1] hept-2-ene, 5-propenyl-bicyclo [2.2.1] hept-2-ene Bicyclic olefins such as;
　トリシクロ［４．３．０．１2,5］デカ－３，７－ジエン（慣用名：ジシクロペンタジエン）、トリシクロ［４．３．０．１2,5］デカ－３－エン；トリシクロ［４．４．０．１2,5］ウンデカ－３，７－ジエン若しくはトリシクロ［４．４．０．１2,5］ウンデカ－３，８－ジエン又はこれらの部分水素添加物（又はシクロペンタジエンとシクロヘキセンの付加物）であるトリシクロ［４．４．０．１2,5］ウンデカ－３－エン；５－シクロペンチル－ビシクロ［２．２．１］ヘプタ－２－エン、５－シクロヘキシル－ビシクロ［２．２．１］ヘプタ－２－エン、５－シクロヘキセニルビシクロ［２．２．１］ヘプタ－２－エン、５－フェニル－ビシクロ［２．２．１］ヘプタ－２－エンといった３環の環状オレフィン； Tricyclo [4.3.0.1 2,5 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.1 2,5 ] dec-3-ene; tricyclo [ 4.4.0.1 2,5 ] undeca-3,7-diene or tricyclo [4.4.0.1 2,5 ] undeca-3,8-diene or a partially hydrogenated product thereof (or cyclopentadiene) Tricyclo [4.4.0.1 2,5 ] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene A cyclic olefin of the ring;
　テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン（単にテトラシクロドデセンともいう）、８－メチルテトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－エチルテトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－メチリデンテトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－エチリデンテトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－ビニルテトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－プロペニル－テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エンといった４環の環状オレフィン； Tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene (also simply referred to as tetracyclododecene), 8-methyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-ethyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-methylidenetetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-ethylidenetetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-vinyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-propenyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] tetracyclic olefins such as dodec-3-ene;
　８－シクロペンチル－テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－シクロヘキシル－テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－シクロヘキセニル－テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン、８－フェニル－シクロペンチル－テトラシクロ［４．４．０．１2,5．１7,10］ドデカ－３－エン；テトラシクロ［７．４．１3,6．０1,9．０2,7］テトラデカ－４，９，１１，１３－テトラエン（１，４－メタノ－１，４，４ａ，９ａ－テトラヒドロフルオレンともいう）、テトラシクロ［８．４．１4,7．０1,10．０3,8］ペンタデカ－５，１０，１２，１４－テトラエン（１，４－メタノ－１，４，４ａ，５，１０，１０ａ－へキサヒドロアントラセンともいう）；ペンタシクロ［６．６．１．１3,6．０2,7．０9,14］－４－ヘキサデセン、ペンタシクロ［６．５．１．１3,6．０2,7．０9,13］－４－ペンタデセン、ペンタシクロ［７．４．０．０2,7．１3,6．１10,13］－４－ペンタデセン；ヘプタシクロ［８．７．０．１2,9．１4,7．１11,17．０3,8．０12,16］－５－エイコセン、ヘプタシクロ［８．７．０．１2,9．０3,8．１4,7．０12,17．１13,l6］－１４－エイコセン；シクロペンタジエンの４量体などの多環の環状オレフィンが挙げられる。これらの環状オレフィンは、それぞれ単独であるいは２種以上組み合わせて用いることができる。 8-cyclopentyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-cyclohexyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-cyclohexenyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodec-3-ene; tetracyclo [7.4.1 3,6 . 0 1,9 . 0 2,7 ] tetradeca-4,9,11,13-tetraene (also referred to as 1,4-methano-1,4,4a, 9a-tetrahydrofluorene), tetracyclo [8.4.1 4,7 . 0 1,10 . 0 3,8 ] pentadeca-5,10,12,14-tetraene (also referred to as 1,4-methano-1,4,4a, 5,10,10a-hexahydroanthracene); pentacyclo [6.6.1] .1 3,6 . 0 2,7 . 0 9,14 ] -4-hexadecene, pentacyclo [6.5.1.1 3,6 . 0 2,7 . 0 9,13] -4-pentadecene, pentacyclo [7.4.0.0 2,7. 1 3,6 . 1 10,13] -4-pentadecene; heptacyclo [8.7.0.1 2,9. 1 4,7 . 1 11,17 . 0 3,8 . 0 12,16 ] -5-eicosene, heptacyclo [8.7.0.1 2,9 . 0 3,8 . 1 4,7 . 0 12,17 . 1 13, l6 ] -14-eicosene ; and polycyclic cyclic olefins such as cyclopentadiene tetramer. These cyclic olefins can be used alone or in combination of two or more.
　環状オレフィンと共重合可能なα－オレフィンの具体例としては、エチレン、プロピレン、１－ブテン、１－ペンテン、１－へキセン、３－メチル－１－ブテン、３－メチル－１－ペンテン、３－エチル－１－ペンテン、４－メチル－１－ペンテン、４－メチル－１－へキセン、４，４－ジメチル－１－ヘキセン、４，４－ジメチル－１－ペンテン、４－エチル－１－へキセン、３－エチル－１－ヘキセン、１－オクテン、１－デセン、１－ドデセン、１－テトラデセン、１－ヘキサデセン、１－オクタデセン、１－エイコセンなどの炭素数２～２０、好ましくは炭素数２～８のエチレン又はα－オレフィンなどが挙げられる。これらのα－オレフィンは、それぞれ単独で、あるいは２種以上を組み合わせて使用することができる。これらのα－オレフィンは、環状ポリオレフィンに対して、５～２００ｍｏｌ％の範囲で含有されたものを使用することができる。 Specific examples of the α-olefin copolymerizable with the cyclic olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1- Hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc. 2-20, preferably carbon numbers Examples thereof include 2 to 8 ethylene or α-olefin. These α-olefins can be used alone or in combination of two or more. As these α-olefins, those contained in the range of 5 to 200 mol% with respect to the cyclic polyolefin can be used.
　環状オレフィン又は環状オレフィンとα－オレフィンとの重合方法及び得られた重合体の水素添加方法に、格別な制限はなく、公知の方法に従って行うことができる。 There is no particular limitation on the polymerization method of the cyclic olefin or the cyclic olefin and the α-olefin and the hydrogenation method of the obtained polymer, and it can be carried out according to a known method.
　環状オレフィン系樹脂として、本実施の形態では、エチレンとノルボルネンの付加共重合体が好ましく用いられる。 In the present embodiment, an addition copolymer of ethylene and norbornene is preferably used as the cyclic olefin resin.
　環状オレフィン系樹脂の構造には、特に制限はなく、鎖状でも、分岐状でも、架橋状でもよいが、好ましくは直鎖状である。 The structure of the cyclic olefin-based resin is not particularly limited, and may be a chain, branched, or crosslinked, but is preferably a straight chain.
　環状オレフィン系樹脂の分子量は、ＧＰＣ法による数平均分子量が５０００～３０万、好ましくは１万～１５万、さらに好ましくは１．５万～１０万である。数平均分子量が低すぎると機械的強度が低下し、大きすぎると成形性が悪くなる。 The molecular weight of the cyclic olefin-based resin is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 15,000 to 100,000 according to the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.
　また、環状オレフィン系樹脂には、前述の環状オレフィン系樹脂（ｌ）～（３）に極性基（例えば、カルボキシル基、酸無水物基、エポキシ基、アミド基、エステル基、ヒドロキシル基など）を有する不飽和化合物（ｕ）をグラフト及び／又は共重合したもの（４）を含めることができる。上記環状オレフィン系樹脂（ｌ）～（４）は、二種以上混合使用してもよい。 In addition, the cyclic olefin resin has a polar group (for example, a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, etc.) in the above-mentioned cyclic olefin resins (1) to (3). What (4) which grafted and / or copolymerized the unsaturated compound (u) which has can be included. Two or more of the above cyclic olefin resins (1) to (4) may be used in combination.
　上記不飽和化合物（ｕ）としては、（メタ）アクリル酸、マレイン酸、無水マレイン酸、無水イタコン酸、グリシジル（メタ）アクリレート、（メタ）アクリル酸アルキル（炭素数１～１０）エステル、マレイン酸アルキル（炭素数１～１０）エステル、（メタ）アクリルアミド、（メタ）アクリル酸－２－ヒドロキシエチル等が挙げられる。 Examples of the unsaturated compound (u) include (meth) acrylic acid, maleic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1 to 10) ester, maleic acid Examples include alkyl (having 1 to 10 carbon atoms) ester, (meth) acrylamide, (2-hydroxyethyl) (meth) acrylate, and the like.
　極性基を有する不飽和化合物（ｕ）をグラフト及び／又は共重合した変性環状オレフィン系樹脂（４）を用いることにより金属や極性樹脂との親和性を高めることができるので、蒸着、スパッタ、コーティング、接着等、各種二次加工の強度を高めることができ、二次加工が必要な場合に好適である。しかし、極性基の存在は環状オレフィン系樹脂の吸水率を高めてしまう欠点がある。そのため極性基（例えば、カルボキシル基、酸無水物基、エポキシ基、アミド基、エステル基、ヒドロキシル基など）の含有量は、環状オレフィン系樹脂１ｋｇ当り０～１ｍｏｌ／ｋｇであることが好ましい。 Affinity with metals and polar resins can be increased by using a modified cyclic olefin resin (4) obtained by grafting and / or copolymerizing an unsaturated compound (u) having a polar group, so vapor deposition, sputtering, coating It is possible to increase the strength of various secondary processing such as adhesion, and is suitable when secondary processing is required. However, the presence of the polar group has a drawback of increasing the water absorption rate of the cyclic olefin resin. Therefore, the content of polar groups (for example, carboxyl group, acid anhydride group, epoxy group, amide group, ester group, hydroxyl group, etc.) is preferably 0 to 1 mol / kg per 1 kg of cyclic olefin resin.
　［スチレン系エラストマー］
　スチレン系エラストマーは、スチレンとブタジエンもしくはイソプレン等の共役ジエンの共重合体、及び／又は、その水素添加物である。スチレン系エラストマーは、スチレンをハードセグメント、共役ジエンをソフトセグメントとしたブロック共重合体である。ソフトセグメントの構造が、スチレン系エラストマーの貯蔵弾性率を変化させ、ハードセグメントであるスチレンの含有率が、屈折率を変化させ、フィルム全体のヘイズを変化させる。スチレン系エラストマーは、加硫工程が不用であり、好適に用いられる。また、水素添加をしたものの方が、熱安定性が高く、さらに好適である。 [Styrene elastomer]
The styrenic elastomer is a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and / or a hydrogenated product thereof. The styrene elastomer is a block copolymer having styrene as a hard segment and conjugated diene as a soft segment. The structure of the soft segment changes the storage elastic modulus of the styrene-based elastomer, and the content of styrene that is the hard segment changes the refractive index and changes the haze of the entire film. The styrene elastomer does not require a vulcanization step and is preferably used. Further, the hydrogenated one is more preferable because it has higher thermal stability.
　スチレン系エラストマーの例としては、スチレン／ブタジエン／スチレンブロック共重合体、スチレン／イソプレン／スチレンブロック共重合体、スチレン／エチレン／ブチレン／スチレンブロック共重合体、スチレン／エチレン／プロピレン／スチレンブロック共重合体、スチレン／ブタジエンブロック共重合体などが挙げられる。 Examples of styrenic elastomers include styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / propylene / styrene block copolymers. Examples thereof include styrene and butadiene block copolymers.
　また、水素添加により共役ジエン成分の二重結合をなくした、スチレン／エチレン／ブチレン／スチレンブロック共重合体、スチレン／エチレン／プロピレン／スチレンブロック共重合体、スチレン／ブタジエンブロック共重合体（水素添加されたスチレン系エラストマーともいう。）などを用いてもよい。 In addition, styrene / ethylene / butylene / styrene block copolymer, styrene / ethylene / propylene / styrene block copolymer, styrene / butadiene block copolymer (hydrogenation) in which double bond of conjugated diene component is eliminated by hydrogenation May also be used.
　スチレン系エラストマーの構造には、特に制限はなく、鎖状でも、分岐状でも、架橋状でもよいが、貯蔵弾性率を小さくするため、好ましくは直鎖状である。 The structure of the styrene-based elastomer is not particularly limited, and may be chain-like, branched or cross-linked, but is preferably linear in order to reduce the storage elastic modulus.
　本実施の形態では、スチレン／エチレン／ブチレン／スチレンブロック共重合体、スチレン／エチレン／プロピレン／スチレンブロック共重合体、水素添加スチレン／ブタジエンブロック共重合体からなる群より選ばれる１種以上のスチレン系エラストマーが好適に用いられる。特に、水素添加スチレン／ブタジエンブロック共重合体は、高い引裂き強度と、環境保存後のヘイズ上昇が小さいため、さらに好適に用いられる。水素添加スチレン／ブタジエンブロック共重合体のスチレンに対するブタジエンの比率は、環状オレフィン系樹脂との相溶性を損なわないために、１０～９０ｍｏｌ％の範囲であることが好ましい。 In the present embodiment, at least one styrene selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers. Based elastomers are preferably used. In particular, hydrogenated styrene / butadiene block copolymers are more preferably used because of high tear strength and small haze increase after environmental preservation. The ratio of butadiene to styrene in the hydrogenated styrene / butadiene block copolymer is preferably in the range of 10 to 90 mol% so as not to impair the compatibility with the cyclic olefin resin.
　また、スチレン系エラストマーのスチレン含有率は、２０～４０ｍｏｌ％であることが好ましい。スチレン含有率を２０～４０ｍｏｌ％とすることにより、ヘイズを小さくすることができる。 Further, the styrene content of the styrene elastomer is preferably 20 to 40 mol%. By setting the styrene content to 20 to 40 mol%, the haze can be reduced.
　また、スチレン系エラストマーの分子量は、ＧＰＣ法による数平均分子量が５０００～３０万、好ましくは１万～１５万、さらに好ましくは２万～１０万である。数平均分子量が低すぎると機械的強度が低下し、大きすぎると成形性が悪くなる。 The molecular weight of the styrene elastomer is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 20,000 to 100,000, as determined by the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.
　スチレン系エラストマーの添加量は、５ｖｏｌ％以上３０ｖｏｌ％以下であることが好ましい。スチレン系エラストマーの添加量が多すぎると環境保存性が低下し、少なすぎると十分な靭性が得られない。 The addition amount of the styrene-based elastomer is preferably 5 vol% or more and 30 vol% or less. If the amount of styrene-based elastomer added is too large, the environmental preservation is reduced, and if it is too small, sufficient toughness cannot be obtained.
　［無機酸化物微粒子］
　無機酸化物微粒子としては、Ａｌ2Ｏ3、ＳｉＯ2、ＺｒＯ2、ＴｉＯ2から選択される１種以上であることが好ましい。これらの無機酸化物微粒子は、線熱膨張係数が小さいため、添加により環状オレフィン系樹脂組成物フィルムの線熱膨張係数を低下させることができる。 [Inorganic oxide fine particles]
The inorganic oxide fine particles are preferably at least one selected from Al 2 O 3 , SiO 2 , ZrO 2 and TiO 2 . Since these inorganic oxide fine particles have a small linear thermal expansion coefficient, the linear thermal expansion coefficient of the cyclic olefin-based resin composition film can be reduced by addition.
　また、無機酸化物微粒子の添加量の上限値としては、３０ｖｏｌ％未満であることが好ましく、より好ましくは２０ｖｏｌ％以下である。また、無機酸化物微粒子の添加量の下限値としては、０．１ｖｏｌ％以上であることが好ましく、より好ましくは１．０ｖｏｌ％以上、さらに好ましくは１０ｖｏｌ％以上である。無機酸化物微粒子の添加量が多すぎると光学特性（ヘイズ、リタデーション）が悪化し、添加量が少なすぎると線膨張係数を低下させることが困難となる。 Also, the upper limit of the amount of inorganic oxide fine particles added is preferably less than 30 vol%, more preferably 20 vol% or less. Moreover, as a lower limit of the addition amount of inorganic oxide microparticles | fine-particles, it is preferable that it is 0.1 vol% or more, More preferably, it is 1.0 vol% or more, More preferably, it is 10 vol% or more. If the addition amount of the inorganic oxide fine particles is too large, the optical properties (haze, retardation) deteriorate, and if the addition amount is too small, it is difficult to reduce the linear expansion coefficient.
　また、無機酸化物微粒子の平均粒径は、５０ｎｍ以下であることが好ましく、より好ましくは５ｎｍ以上１０ｎｍ以下である。平均粒径が大きすぎると、光散乱が生じ、シートが白色化される虞があり、目的とする透明性が得られなくなる場合がある。また、平均粒径が小さすぎると、添加が実質的に困難となる。なお、平均粒径は、例えば微粒子の長軸長さ（板状微粒子の場合、板面方向に相当）と短軸長さ（板状微粒子の場合、板厚み方向に相当）の和を２で除した値（（長軸＋短軸）／２）を粒子毎に算出し、１００個の粒子の平均値とすることができる。 Further, the average particle diameter of the inorganic oxide fine particles is preferably 50 nm or less, more preferably 5 nm or more and 10 nm or less. If the average particle size is too large, light scattering may occur and the sheet may be whitened, and the intended transparency may not be obtained. Moreover, when an average particle diameter is too small, addition will become substantially difficult. The average particle diameter is, for example, the sum of the long axis length of fine particles (corresponding to the plate surface direction in the case of plate-like fine particles) and the short axis length (corresponding to the plate thickness direction in the case of plate-like fine particles) of 2 The divided value ((major axis + minor axis) / 2) is calculated for each particle, and can be an average value of 100 particles.
　無機酸化物粒子は、気相法又は液相法により製造される。気相法は、乾燥粉末が直接得られるため、分散性が比較的良好な粉末をえることができるが、化学炎法を除いて量産性に乏しく、高コストとなるため工業的生産に適していない。液相法は、溶液中の化学反応により結晶核を生成、成長させ、乾燥、焼成の工程を経る。微粒子を作製するには、各工程で粒成長させないよう、製造条件を厳密にコントロールする必要がある。また、液相法では、乾燥時に粒子を固く凝集させてしまうと、分散に大きなエネルギーが必要となるため、凝集させないことが最も重要である。場合によっては、乾燥、焼成工程を経ないで、液相のまま直接、分散工程に進む方法を用いてもよい。 The inorganic oxide particles are produced by a gas phase method or a liquid phase method. The vapor phase method can obtain a powder with relatively good dispersibility because a dry powder can be obtained directly. However, except for the chemical flame method, it is not suitable for industrial production because of its low mass production and high cost. Absent. In the liquid phase method, crystal nuclei are generated and grown by a chemical reaction in a solution, followed by drying and firing processes. In order to produce fine particles, it is necessary to strictly control the production conditions so that the grains do not grow in each step. Also, in the liquid phase method, if the particles are agglomerated tightly at the time of drying, a large energy is required for dispersion, so it is most important not to agglomerate. In some cases, a method may be used in which the process proceeds directly to the dispersion step while leaving the liquid phase without passing through the drying and firing steps.
　［他の添加物］
　環状オレフィン系樹脂組成物には、環状オレフィン系樹脂、スチレン系エラストマー、及び無機酸化物微粒子の他に、その特性を損なわない範囲で、必要に応じて各種配合剤が添加されていてもよい。各種配合剤としては、熱可塑性樹脂材料で通常用いられているものであれば格別な制限はなく、例えば、酸化防止剤、紫外線吸収剤、光安定剤、可塑剤、滑剤、帯電防止剤、難燃剤、染料や顔料などの着色剤、近赤外線吸収剤、蛍光増白剤などの配合剤、充填剤等が挙げられる。 [Other additives]
In addition to the cyclic olefin resin, the styrene elastomer, and the inorganic oxide fine particles, various compounding agents may be added to the cyclic olefin resin composition as necessary as long as the characteristics thereof are not impaired. The various compounding agents are not particularly limited as long as they are usually used in thermoplastic resin materials. For example, antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, lubricants, antistatic agents, difficulty Examples include flame retardants, colorants such as dyes and pigments, near infrared absorbers, compounding agents such as fluorescent brighteners, and fillers.
　このような構成からなる環状オレフィン系樹脂組成物フィルムによれば、面内方向のリタデーションＲ0を１０ｎｍ以下、引裂き強度を６０Ｎ／ｍｍ以上、ヘイズを１．０％以下とすることができる。引裂き強度が上記範囲より小さいと、製造時や使用時にフィルムの破断が起きやすく不適である。また、ヘイズが高すぎると、使用上、初期設定の特性から逸脱し、本来目的の特性を満足しない。 According to the cyclic olefin resin composition film having such a configuration, the in-plane retardation R 0 can be 10 nm or less, the tear strength can be 60 N / mm or more, and the haze can be 1.0% or less. If the tear strength is less than the above range, the film is liable to break during production or use, which is inappropriate. On the other hand, if the haze is too high, it deviates from the initial characteristics in use and does not satisfy the intended characteristics.
　＜２．環状オレフィン系樹脂組成物フィルムの製造方法＞
　本実施の形態に係る環状オレフィン系樹脂組成物フィルムの製造方法は、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを加熱溶融し、加熱溶融された環状オレフィン系樹脂組成物を押出法により、フィルム状に押し出し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である環状オレフィン系樹脂組成物フィルムを得る。環状オレフィン系樹脂組成物フィルムは、無延伸のものでも、一軸延伸のものでも、二軸延伸のものでもよい。 <2. Method for Producing Cyclic Olefin Resin Composition Film>
The method for producing a cyclic olefin-based resin composition film according to the present embodiment includes heating and melting a cyclic olefin-based resin composition, a styrene-based elastomer, and inorganic oxide fine particles. Extruded into a film by an extrusion method to obtain a cyclic olefin-based resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less. The cyclic olefin-based resin composition film may be non-stretched, uniaxially stretched, or biaxially stretched.
　図２は、フィルム製造装置の一構成例を示す模式図である。このフィルム製造装置は、ダイ２１と、ロール２２とを備える。ダイ２１は、溶融成形用のダイであり、溶融状態の樹脂材料２３をフィルム状に押し出す。樹脂材料２３は、例えば前述の環状オレフィン系樹脂組成物を含む。ロール２２は、ダイ２１からフィルム状に押し出された樹脂材料２３を搬送する役割をもつ。また、ロール２２は、その内部に媒体の流路を有し、それぞれ個別の温調装置により任意の温度に表面を調整可能である。また、ロール２２の表面の材質は、特に限定されるものではなく、金属ゴム、樹脂、エラストマーなどを用いることができる。 FIG. 2 is a schematic diagram showing a configuration example of a film manufacturing apparatus. The film manufacturing apparatus includes a die 21 and a roll 22. The die 21 is a die for melt molding, and extrudes the molten resin material 23 into a film shape. The resin material 23 contains the above-mentioned cyclic olefin resin composition, for example. The roll 22 has a role of transporting the resin material 23 extruded from the die 21 into a film shape. Further, the roll 22 has a medium flow path therein, and the surface can be adjusted to an arbitrary temperature by an individual temperature control device. Moreover, the material of the surface of the roll 22 is not specifically limited, A metal rubber, resin, an elastomer, etc. can be used.
　本実施の形態では、樹脂材料２３として、前述の環状オレフィン系樹脂と、スチレン系エラストマーとを含有する環状オレフィン系樹脂組成物を用い、２１０℃～３００℃の範囲の温度で溶融混合する。溶融温度が高いほどスチレン系エラストマーの短軸分散径が小さくなる傾向にある。 In the present embodiment, as the resin material 23, a cyclic olefin resin composition containing the above-mentioned cyclic olefin resin and a styrene elastomer is melt-mixed at a temperature in the range of 210 ° C to 300 ° C. The higher the melting temperature, the smaller the short axis dispersion diameter of the styrene elastomer.
　＜３．電子機器への適用例＞
　本実施の形態に係る環状オレフィン系樹脂組成物フィルムは、各種光学用途、例えば位相差フィルム、偏光板保護フィルム、光拡散板等、特にプリズムシート、液晶セル基板への用途に用いることができる。以下では、環状オレフィン系樹脂組成物フィルムを位相差フィルムとして用いた適用例について説明する。 <3. Application example to electronic equipment>
The cyclic olefin-based resin composition film according to the present embodiment can be used for various optical applications, for example, a retardation film, a polarizing plate protective film, a light diffusion plate, etc., particularly a prism sheet and a liquid crystal cell substrate. Below, the application example which used the cyclic olefin resin composition film as a phase difference film is demonstrated.
　図３Ａ及び図３Ｂは、透明導電性フィルムの一例を示す断面図である。この透明導電性フィルム（透明導電性素子）は、前述の環状オレフィン系樹脂組成物フィルムをベースフィルム（基材）として構成される。具体的には、この透明導電性フィルムは、ベースフィルム（基材）としての位相差フィルム３１と、位相差フィルム３１の少なくとも一方の表面に透明導電層３３とを備える。図３Ａは、位相差フィルム３１の一方の表面に透明導電層３３を設けた例であり、図３Ｂは、位相差フィルム３１の両方の表面に透明導電層３３を設けた例である。また、図３Ａ及び図３Ｂに示すように、位相差フィルム３１と透明導電層３３との間にハードコート層３２をさらに備えるようにしてもよい。 3A and 3B are cross-sectional views showing an example of a transparent conductive film. This transparent conductive film (transparent conductive element) is constituted by using the above-mentioned cyclic olefin-based resin composition film as a base film (base material). Specifically, this transparent conductive film includes a retardation film 31 as a base film (base material), and a transparent conductive layer 33 on at least one surface of the retardation film 31. FIG. 3A is an example in which the transparent conductive layer 33 is provided on one surface of the retardation film 31, and FIG. 3B is an example in which the transparent conductive layer 33 is provided on both surfaces of the retardation film 31. In addition, as shown in FIGS. 3A and 3B, a hard coat layer 32 may be further provided between the retardation film 31 and the transparent conductive layer 33.
　透明導電層３３の材料としては、例えば、電気的導電性を有する金属酸化物材料、金属材料、炭素材料、及び導電性ポリマーなどからなる群より選ばれる１種以上を用いることができる。金属酸化物材料としては、例えば、インジウム錫酸化物（ＩＴＯ）酸化亜鉛、酸化インジウム、アンチモン添加酸化錫、フッ素添加酸化錫、アルミニウム添加酸化亜鉛、ガリウム添加酸化亜鉛、シリコン添加酸化亜鉛、酸化亜鉛－酸化錫系、酸化インジウム－酸化錫系、酸化亜鉛－酸化インジウム－酸化マグネシウム系などが挙げられる。金属材料としては、例えば、金属ナノ粒子、金属ナノワイヤーなどの金属ナノフィラーを用いることができる。これらの具体的材料としては、例えば、銅、銀、金、白金、パラジウム、ニッケル、錫、コバルト、ロジウム、イリジウム、鉄、ルテニウム、オスミウム、マンガン、モリブデン、タングステン、ニオブ、タンタル、チタン、ビスマス、アンチモン、鉛などの金属又はこれらの合金などが挙げられる。炭素材料としては、例えば、カーボンブラック、炭素繊維、フラーレン、グラフェン、カーボンナノチューブ、カーボンマイクロコイル、ナノホーンなどが挙げられる。導電性ポリマーとしては、例えば、置換又は無置換のポリアニリン、ポリビロール、ポリチオフィン、及びこれらから選ばれる１種又は２種からなる（共）重合体などを用いることができる。 As the material of the transparent conductive layer 33, for example, one or more selected from the group consisting of electrically conductive metal oxide materials, metal materials, carbon materials, and conductive polymers can be used. Examples of the metal oxide material include indium tin oxide (ITO) zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, gallium-added zinc oxide, silicon-added zinc oxide, and zinc oxide- Examples thereof include a tin oxide system, an indium oxide-tin oxide system, and a zinc oxide-indium oxide-magnesium oxide system. As the metal material, for example, metal nanofillers such as metal nanoparticles and metal nanowires can be used. Specific examples of these materials include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, titanium, bismuth, Examples thereof include metals such as antimony and lead, and alloys thereof. Examples of the carbon material include carbon black, carbon fiber, fullerene, graphene, carbon nanotube, carbon microcoil, and nanohorn. As the conductive polymer, for example, substituted or unsubstituted polyaniline, polypyrrole, polythiofin, and one or two (co) polymers selected from these can be used.
　透明導電層３３の形成方法としては、例えば、スパッタリング法、真空蒸着法、イオンプレーティング法などのＰＶＤ法や、ＣＶＤ法、塗工法、印刷法などを用いることができる。透明導電層３３は、所定の電極パターンを有する透明電極であってもよい。電極パターンとしては、ストライプ状などが挙げられるが、これに限定されるものではない。 As a method for forming the transparent conductive layer 33, for example, a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method, a CVD method, a coating method, a printing method, or the like can be used. The transparent conductive layer 33 may be a transparent electrode having a predetermined electrode pattern. Examples of the electrode pattern include a stripe shape, but are not limited thereto.
　ハードコート層３２の材料としては、光又は電子線などにより硬化する電離放射線硬化樹脂、又は熱により硬化する熱硬化型樹脂を用いることが好ましく、紫外線により硬化する感光性樹脂が最も好ましい。このような感光性樹脂としては、例えば、ウレタンアクリレート、エポキシアクリレート、ポリエステルアクリレート、ポリオールアクリレート、ポリエーテルアクリレート、メラミンアクリレートなどのアクリレート系樹脂を用いることができる。例えば、ウレタンアクリレート樹脂は、ポリエステルポリオールにイソシアネートモノマー、あるいはプレポリマーを反応させ、得られた生成物に、水酸基を有するアクリレート又はメタアクリレート系のモノマーを反応させることによって得られる。ハードコート層３２の厚みは、１μｍ～２０μｍであることが好ましいが、この範囲に特に限定されるものではない。 As the material of the hard coat layer 32, it is preferable to use an ionizing radiation curable resin that is cured by light or an electron beam, or a thermosetting resin that is cured by heat, and a photosensitive resin that is cured by ultraviolet rays is most preferable. As such a photosensitive resin, for example, acrylate resins such as urethane acrylate, epoxy acrylate, polyester acrylate, polyol acrylate, polyether acrylate, and melamine acrylate can be used. For example, the urethane acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting an acrylate or methacrylate monomer having a hydroxyl group with the obtained product. The thickness of the hard coat layer 32 is preferably 1 μm to 20 μm, but is not particularly limited to this range.
　また、透明導電性フィルムは、図３Ｃ及び図３Ｄに示すように、上述の位相差フィルムの少なくとも一方の表面に反射防止層としてのモスアイ（蛾の目）形状の構造体３４を設けるようにしてもよい。図３Ｃは、位相差フィルム３１の一方の表面にモスアイ形状の構造体３４を設けた例であり、図３Ｄは、位相差フィルムの両方の表面にモスアイ形状の構造体を設けた例である。なお、位相差フィルム１１の表面に設けられる反射防止層は、上述のモスアイ形状の構造体に限定されるものではなく、低屈折率層などの従来公知の反射防止層を用いることも可能である。 In addition, as shown in FIGS. 3C and 3D, the transparent conductive film is provided with a moth-eye structure 34 as an antireflection layer on at least one surface of the above-described retardation film. Also good. FIG. 3C is an example in which a moth-eye structure 34 is provided on one surface of the retardation film 31, and FIG. 3D is an example in which a moth-eye structure is provided on both surfaces of the retardation film. The antireflection layer provided on the surface of the retardation film 11 is not limited to the moth-eye structure described above, and a conventionally known antireflection layer such as a low refractive index layer can also be used. .
　図４は、タッチパネルの一構成例を示す概略断面図である。このタッチパネル（入力装置）４０は、いわゆる抵抗膜方式タッチパネルである。抵抗膜方式タッチパネルとしては、アナログ抵抗膜方式タッチパネル、又はデジタル抵抗膜方式タッチパネルのいずれであってもよい。 FIG. 4 is a schematic cross-sectional view showing one configuration example of the touch panel. The touch panel (input device) 40 is a so-called resistive film type touch panel. The resistive film type touch panel may be either an analog resistive film type touch panel or a digital resistive film type touch panel.
　タッチパネル４０は、第１の透明導電性フィルム４１と、第１の透明導電性フィルム４１と対向する第２の透明導電性フィルム４２とを備える。第１の透明導電性フィルム４１と第２の透明導電性フィルム４２は、それらの周縁部間において貼り合わせ部４５を介して貼り合わされている。貼り合わせ部４５としては、例えば、粘着ペースト、粘着テープなどが用いられる。このタッチパネル４０は、例えば表示装置４４に対して貼り合わせ層４３を介して貼り合わされる。貼り合わせ層４３の材料としては、例えば、アクリル系、ゴム系、シリコン系などの粘着剤を用いることができ、透明性の観点から、アクリル系粘着剤が好ましい。 The touch panel 40 includes a first transparent conductive film 41 and a second transparent conductive film 42 facing the first transparent conductive film 41. The 1st transparent conductive film 41 and the 2nd transparent conductive film 42 are bonded together via the bonding part 45 between those peripheral parts. As the bonding part 45, for example, an adhesive paste, an adhesive tape or the like is used. The touch panel 40 is bonded to the display device 44 through the bonding layer 43, for example. As a material of the bonding layer 43, for example, an acrylic, rubber, or silicon adhesive can be used, and an acrylic adhesive is preferable from the viewpoint of transparency.
　タッチパネル４０は、第１の透明導電性フィルム４１のタッチ側となる面に対して、貼り合わせ層５０などを介して貼り合わされた偏光子４８をさらに備える。第１の透明導電性フィルム４１及び／又は第２の透明導電性フィルム４２としては、前述の透明導電性フィルムを用いることができる。但し、ベースフィルム（基材）としての位相差フィルムは、λ／４に設定される。このように偏光子４８と位相差フィルム３１とを採用することにより、反射率を低減し、視認性を向上させることができる。 The touch panel 40 further includes a polarizer 48 bonded to the surface on the touch side of the first transparent conductive film 41 via a bonding layer 50 or the like. As the 1st transparent conductive film 41 and / or the 2nd transparent conductive film 42, the above-mentioned transparent conductive film can be used. However, the retardation film as the base film (base material) is set to λ / 4. By adopting the polarizer 48 and the retardation film 31 in this way, the reflectance can be reduced and the visibility can be improved.
　タッチパネル４０は、第１の透明導電性フィルム４１及び第２の透明導電性フィルム４２の対向する表面、すなわち透明導電層３３の表面にモスアイ構造体３４を設けることが好ましい。これにより、第１の透明導電性フィルム４１及び第２の透明導電性フィルム４２の光学特性（例えば反射特性や透過特性など）を向上させることができる。 The touch panel 40 is preferably provided with a moth-eye structure 34 on the opposing surfaces of the first transparent conductive film 41 and the second transparent conductive film 42, that is, on the surface of the transparent conductive layer 33. Thereby, the optical characteristics (for example, a reflection characteristic, a transmission characteristic, etc.) of the 1st transparent conductive film 41 and the 2nd transparent conductive film 42 can be improved.
　タッチパネル４０は、第１の透明導電性フィルム４１のタッチ側となる面に単層又は多層の反射防止層をさらに備えることが好ましい。これにより、反射率を低減し、視認性を向上させることができる。 The touch panel 40 preferably further includes a single-layer or multi-layer antireflection layer on the surface of the first transparent conductive film 41 on the touch side. Thereby, a reflectance can be reduced and visibility can be improved.
　タッチパネル４０は、耐擦傷性の向上の観点から、第１の透明導電性フィルム４１のタッチ側となる面にハードコート層をさらに備えることが好ましい。このハードコート層の表面には、防汚性が付与されていることが好ましい。 It is preferable that the touch panel 40 further includes a hard coat layer on the surface on the touch side of the first transparent conductive film 41 from the viewpoint of improving the scratch resistance. The surface of the hard coat layer is preferably imparted with antifouling properties.
　タッチパネル４０は、第１の透明導電性フィルム４１のタッチ側となる面に対して、貼り合わせ層５１を介して貼り合わされたフロントパネル（表面部材）４９をさらに備えることが好ましい。また、タッチパネル４０は、第２の透明導電性フィルム４２の表示装置４４に貼り合わされる面に、貼り合わせ層４７を介して貼り合わされたガラス基板４６をさらに備えることが好ましい。 It is preferable that the touch panel 40 further includes a front panel (surface member) 49 bonded to the surface on the touch side of the first transparent conductive film 41 via the bonding layer 51. Moreover, it is preferable that the touch panel 40 further includes a glass substrate 46 bonded to the surface of the second transparent conductive film 42 bonded to the display device 44 via a bonding layer 47.
　タッチパネル４０は、第２の透明導電性フィルム４２の表示装置４４などと貼り合わされる面に、複数の構造体をさらに備えることが好ましい。複数の構造体のアンカー効果により、タッチパネル４０と貼り合わせ層４３との間の接着性を向上することができる。この構造体としては、モスアイ形状の構造体が好ましい。これにより、界面反射を抑制することができる。 The touch panel 40 preferably further includes a plurality of structures on the surface to be bonded to the display device 44 of the second transparent conductive film 42 or the like. The adhesion between the touch panel 40 and the bonding layer 43 can be improved by the anchor effect of the plurality of structures. As this structure, a moth-eye structure is preferable. Thereby, interface reflection can be suppressed.
　表示装置４４としては、例えば、液晶ディスプレイ、ＣＲＴ（Cathode Ray Tube）ディスプレイ、プラズマディスプレイ（Plasma Display Panel：ＰＤＰ）、エレクトロルミネッセンス（Electro Luminescence：ＥＬ）ディスプレイ、表面伝導型電子放出素子ディスプレイ（Surface-conduction Electron-emitter Display：ＳＥＤ）などの各種表示装置を用いることができる。 As the display device 44, for example, a liquid crystal display, a CRT (Cathode Ray Tube) display, a plasma display (Plasma Display Panel: PDP), an electroluminescence (Electro Luminescence: EL) display, a surface conduction electron-emitting device display (Surface-conduction Various display devices such as Electron-emitter Display (SED) can be used.
　次に、前述した入力装置４０を備える電子機器について説明する。図５は、電子機器としてテレビ装置の例を示す外観図である。テレビ装置１００は、表示部１０１を備え、その表示部１０１にタッチパネル４０を備える。 Next, an electronic apparatus including the input device 40 described above will be described. FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus. The television device 100 includes a display unit 101, and the display unit 101 includes a touch panel 40.
　図６Ａ及び図６Ｂは、電子機器としてデジタルカメラの例を示す外観図である。図６Ａは、デジタルカメラを表側から見た外観図であり、図６Ｂは、デジタルカメラを裏側から見た外観図である。デジタルカメラ１１０は、フラッシュ用の発光部１１１、表示部１１２、メニュースイッチ１１３、シャッターボタン１１４などを備え、その表示部１１２に前述のタッチパネル４０を備える。 6A and 6B are external views illustrating examples of a digital camera as an electronic device. 6A is an external view of the digital camera viewed from the front side, and FIG. 6B is an external view of the digital camera viewed from the back side. The digital camera 110 includes a light emitting unit 111 for flash, a display unit 112, a menu switch 113, a shutter button 114, and the like, and the display unit 112 includes the touch panel 40 described above.
　図７は、電子機器としてノート型パーソナルコンピュータの例を示す外観図である。ノート型パーソナルコンピュータ１２０は、本体部１２１に、文字を入力するキーボード１２２、画像を表示する表示部１２３などを備え、その表示部１２３に前述のタッチパネル４０を備える。 FIG. 7 is an external view showing an example of a notebook personal computer as an electronic device. The notebook personal computer 120 includes a main body 121 including a keyboard 122 for inputting characters, a display unit 123 for displaying images, and the like, and the display unit 123 includes the touch panel 40 described above.
　図８は、電子機器としてビデオカメラの例を示す外観図である。ビデオカメラ１３０は、本体部１３１、前方を向いた側面に被写体撮影用のレンズ１３２、撮影時のスタート／ストップスイッチ１３３、表示部１３４などを備え、その表示部１３４に前述のタッチパネル４０を備える。 FIG. 8 is an external view showing an example of a video camera as an electronic device. The video camera 130 includes a main body 131, a subject shooting lens 132 on the side facing forward, a start / stop switch 133 during shooting, a display unit 134, and the like, and the display unit 134 includes the touch panel 40 described above.
　図９は、電子機器として携帯電話の一例を示す外観図である。携帯電話１４０は、いわゆるスマートフォンであり、その表示部１４１に前述のタッチパネル４０を備える。 FIG. 9 is an external view showing an example of a mobile phone as an electronic device. The mobile phone 140 is a so-called smartphone, and the display unit 141 includes the touch panel 40 described above.
　図１０は、電子機器としてタブレット型コンピュータの一例を示す外観図である。タブレット型コンピュータ１５０は、その表示部１５１に前述のタッチパネル４０を備える。 FIG. 10 is an external view showing an example of a tablet computer as an electronic device. The tablet computer 150 includes the touch panel 40 described above on the display unit 151.
　以上のような各電子機器であっても、表示部に、面内リタデーションが小さく、靱性に優れた環状オレフィン系樹脂組成物フィルムが使用されているため、高耐久で高画質な表示が可能になる。 Even in each electronic device as described above, a cyclic olefin resin composition film with small in-plane retardation and excellent toughness is used for the display part, so that high durability and high image quality display is possible. Become.
　＜４．１　第１の実施例＞
　以下、本発明の実施例について詳細に説明する。本実施例では、環状オレフィン系樹脂に、スチレン系エラストマー及び無機微粒子を添加し、環状オレフィン系樹脂組成物フィルムを作成した。そして、線熱膨張係数、リタデーション、引裂き強度、及び初期ヘイズについて評価した。なお、本発明はこれらの実施例に限定されるものではない。 <4.1 First Example>
Examples of the present invention will be described in detail below. In this example, a styrene elastomer and inorganic fine particles were added to a cyclic olefin resin to prepare a cyclic olefin resin composition film. The linear thermal expansion coefficient, retardation, tear strength, and initial haze were evaluated. The present invention is not limited to these examples.
　環状オレフィン系樹脂組成物フィルムの線熱膨張係数、リタデーション、引裂き強度、及び初期ヘイズは、次のように測定した。 The linear thermal expansion coefficient, retardation, tear strength, and initial haze of the cyclic olefin-based resin composition film were measured as follows.
　［線熱膨張係数の測定］
　熱機械分析装置（ＴＭＡ：Thermomechanical Analysis、ＮＥＴＺＳＣＨ Japan製 ＴＭＡ４１００ＳＡ）を使用し、ＪＩＳＫ７１９７に準拠して線熱膨張係数を算出した。厚み０．２～０．３ｍｍのフィルムから４×１０ｍｍの試験片を作製し、試験片の温度０℃～２００℃における平均の線熱膨張率（ｐｐｍ／℃）を昇温速度２℃／ｍｉｎにて算出した。 [Measurement of linear thermal expansion coefficient]
The linear thermal expansion coefficient was calculated based on JISK7197 using a thermomechanical analyzer (TMA: Thermomechanical Analysis, TMA4100SA manufactured by NETZSCH Japan). A test piece of 4 × 10 mm was produced from a film having a thickness of 0.2 to 0.3 mm, and the average linear thermal expansion coefficient (ppm / ° C.) at a temperature of 0 ° C. to 200 ° C. was measured. It calculated in.
　［リタデーションの測定］
　光学材料検査装置（ＲＥＴＳ－１００、大塚電子社製）を使用し、環状オレフィン系樹脂組成物フィルムの面内方向のリタデーションＲ0を測定した。 [Measurement of retardation]
Using an optical material inspection apparatus (RETS-100, manufactured by Otsuka Electronics Co., Ltd.), the in-plane retardation R 0 of the cyclic olefin resin composition film was measured.
　［引裂き強度（直角形引き裂き）の測定］
　厚み８０μｍのフィルムをＪＩＳＫ７１２８に従い測定した。試験片として３号形試験片を用い、引張試験機（ＡＧ－Ｘ、島津製作所（株）製）を用いて試験速度２００ｍｍ／分で測定し、ＭＤ方向及びＴＤ方向の平均値を引裂き強度とした。引裂き強度が６０Ｎ／ｍｍ以上のものを「○」と評価し、６０Ｎ／ｍｍ未満のものを「×」と評価した。引き裂き強度が、６０Ｎ／ｍｍ以上あれば、コーティング工程などの後工程での破断の恐れが低下する点で、実用上の使用が可能である。 [Measurement of tear strength (right-angle tear)]
A film having a thickness of 80 μm was measured according to JISK7128. A No. 3 type test piece was used as a test piece, measured at a test speed of 200 mm / min using a tensile tester (AG-X, manufactured by Shimadzu Corporation), and the average value in the MD and TD directions was determined as the tear strength. did. A tear strength of 60 N / mm or more was evaluated as “◯”, and a tear strength of less than 60 N / mm was evaluated as “x”. If the tear strength is 60 N / mm or more, practical use is possible in that the risk of breakage in a subsequent process such as a coating process is reduced.
　［初期ヘイズの測定］
　厚み８０μｍのフィルムについて、ヘイズメーター（ＨＭ１５０、（株）村上色彩技術研究所製）を使用して初期ヘイズを測定した。初期ヘイズが１．０％未満のものを「○」と評価し、初期ヘイズが１．０％以上のものを「×」と評価した。 [Measurement of initial haze]
The initial haze of a film having a thickness of 80 μm was measured using a haze meter (HM150, manufactured by Murakami Color Research Laboratory Co., Ltd.). Those having an initial haze of less than 1.0% were evaluated as “◯”, and those having an initial haze of 1.0% or more were evaluated as “x”.
　［環状オレフィン系樹脂、スチレン系エラストマー、及び無機酸化物微粒子］
　環状オレフィン系樹脂としては、ＴＯＰＡＳ６０１３－Ｓ０４（ポリプラスチック（株）製、エチレンとノルボルネンの付加共重合体）を使用した。 [Cyclic olefin resin, styrene elastomer, and inorganic oxide fine particles]
As the cyclic olefin-based resin, TOPAS 6013-S04 (manufactured by Polyplastics Co., Ltd., an addition copolymer of ethylene and norbornene) was used.
　また、スチレン系エラストマーとしては、タフテックＨ１０４１（旭化成ケミカルズ（株）製、スチレン／エチレン／ブチレン／スチレンブロック共重合体）を使用した。 As the styrene elastomer, Tuftec H1041 (manufactured by Asahi Kasei Chemicals Corporation, styrene / ethylene / butylene / styrene block copolymer) was used.
　また、無機酸化物微粒子としては、Ａｌ2Ｏ3、ＳｉＯ2、ＺｒＯ2、及びＴｉＯ2を使用した。
　Ａｌ2Ｏ3（酸化アルミニウム（γ型））：線熱膨張係数７．２ｐｐｍ／℃、平均粒径５ｎｍ、ＩｏＬｉＴｅｃ社製
　ＳｉＯ2（二酸化ケイ素）：線熱膨張係数０．７ｐｐｍ／℃、平均粒径１５ｎｍ、ＩｏＬｉＴｅｃ社製
　ＺｒＯ2（酸化ジルコニウム）：線熱膨張係数１０．５ｐｐｍ／℃、平均粒径４０ｎｍ、ＩｏＬｉＴｅｃ社製
　ＴｉＯ2（酸化チタン）：線熱膨張係数７．１ｐｐｍ／℃、平均粒径２０ｎｍ、石原産業社製 Moreover, as the inorganic oxide fine particles, Al 2 O 3 , SiO 2 , ZrO 2 , and TiO 2 were used.
Al 2 O 3 (aluminum oxide (γ type)): coefficient of linear thermal expansion 7.2 ppm / ° C., average particle size 5 nm, manufactured by IoLiTec SiO 2 (silicon dioxide): coefficient of linear thermal expansion 0.7 ppm / ° C., average particle Diameter 15 nm, IoLiTec ZrO 2 (zirconium oxide): linear thermal expansion coefficient 10.5 ppm / ° C., average particle size 40 nm, IoLiTec TiO 2 (titanium oxide): linear thermal expansion coefficient 7.1 ppm / ° C., average particle Diameter 20nm, made by Ishihara Sangyo
　［実施例１］
　環状オレフィン系樹脂を８０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＡｌ2Ｏ3を１０ｖｏｌ％配合し、これを先端にＴダイを取り付けた二軸押出機（仕様：直径２５ｍｍ、長さ：２６Ｄ、Ｔダイ幅：１６０ｍｍ）を用いて２１０℃～３００℃の温度範囲の所定温度で混練した後、環状オレフィン系樹脂組成物を、２５０ｇ／ｍｉｎの速さで押し出し、厚さが８０μｍのフィルムをロールに巻きとった。この作製方法により、スチレン系エラストマーは、フィルムのＭＤ方向に形状異方性を持って分散し、ＭＤ方向に平均約４μｍの長軸を有し、ＴＤ方向に平均約０．２μｍの短軸を有していた。 [Example 1]
A twin-screw extruder containing 80 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as a styrene elastomer and 10 vol% of Al 2 O 3 as inorganic oxide fine particles, and a T-die attached to the tip (specifications: And kneading at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a diameter of 25 mm, length: 26D, T die width: 160 mm), and then extruding the cyclic olefin resin composition at a speed of 250 g / min. A film having a thickness of 80 μm was wound on a roll. By this production method, the styrenic elastomer is dispersed with shape anisotropy in the MD direction of the film, has an average major axis of about 4 μm in the MD direction, and an average minor axis of about 0.2 μm in the TD direction. Had.
　表１に示すように、フィルムの線熱膨張係数は４７ｐｐｍ／℃であり、リタデーションＲ0は４．７ｎｍで○の評価であり、引裂き強度は８１Ｎ／ｍｍで○の評価であり、初期ヘイズは０．５％で○の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 47 ppm / ° C., the retardation R 0 is an evaluation of ○ at 4.7 nm, the tear strength is an evaluation of ○ at 81 N / mm, and the initial haze is The evaluation was ○ at 0.5%.
　［実施例２］
　環状オレフィン系樹脂を７０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＡｌ2Ｏ3を２０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Example 2]
A film having a thickness of 80 μm in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as styrene elastomer, and 20 vol% of Al 2 O 3 as inorganic oxide fine particles were blended. Was made.
　表１に示すように、フィルムの線熱膨張係数は４３ｐｐｍ／℃であり、リタデーションＲ0は４．７ｎｍで○の評価であり、引裂き強度は７２Ｎ／ｍｍで○の評価であり、初期ヘイズは０．６％で○の評価であった。 As shown in Table 1, the coefficient of linear thermal expansion of the film is 43 ppm / ° C., the retardation R 0 is 4.7 nm, and the tear strength is 72 N / mm, and the initial haze is The evaluation was ○ at 0.6%.
　［実施例３］
　環状オレフィン系樹脂を８０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＳｉＯ2を１０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Example 3]
A film having a thickness of 80 μm was prepared in the same manner as in Example 1 except that 80 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 10 vol% of SiO 2 as inorganic oxide fine particles were blended. did.
　表１に示すように、フィルムの線熱膨張係数は４６ｐｐｍ／℃であり、リタデーションＲ0は４．６ｎｍで○の評価であり、引裂き強度は８１Ｎ／ｍｍで○の評価であり、初期ヘイズは０．５％で○の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 46 ppm / ° C., the retardation R 0 is 4.6 nm, and the tear strength is 81 N / mm, and the initial haze is The evaluation was ○ at 0.5%.
　［実施例４］
　環状オレフィン系樹脂を７０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＳｉＯ2を２０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Example 4]
A film having a thickness of 80 μm is prepared in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 20 vol% of SiO 2 as inorganic oxide fine particles are blended. did.
　表１に示すように、フィルムの線熱膨張係数は４１ｐｐｍ／℃であり、リタデーションＲ0は４．６ｎｍで○の評価であり、引裂き強度は７２Ｎ／ｍｍで○の評価であり、初期ヘイズは０．６％で○の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 41 ppm / ° C., the retardation R 0 is 4.6 nm, and the tear strength is 72 N / mm, and the initial haze is The evaluation was ○ at 0.6%.
　［実施例５］
　環状オレフィン系樹脂を７０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＺｒＯ2を２０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Example 5]
A film having a thickness of 80 μm is prepared in the same manner as in Example 1 except that 70 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 20 vol% of ZrO 2 as inorganic oxide fine particles are blended. did.
　表１に示すように、フィルムの線熱膨張係数は４３ｐｐｍ／℃であり、リタデーションＲ0は５．３ｎｍで○の評価であり、引裂き強度は７２Ｎ／ｍｍで○の評価であり、初期ヘイズは０．６％で○の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 43 ppm / ° C., the retardation R 0 is 5.3, and the evaluation is ○. The tear strength is 72 N / mm, and the initial haze is The evaluation was ○ at 0.6%.
　［実施例６］
　環状オレフィン系樹脂を７０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＴｉＯ2を２０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Example 6]
A film having a thickness of 80 μm is prepared in the same manner as in Example 1 except that 70 vol% of the cyclic olefin resin, 10 vol% of Tuftec H1041 as the styrene elastomer, and 20 vol% of TiO 2 as the inorganic oxide fine particles are blended. did.
　表１に示すように、フィルムの線熱膨張係数は４３ｐｐｍ／℃であり、リタデーションＲ0は５．０ｎｍで○の評価であり、引裂き強度は７２Ｎ／ｍｍで○の評価であり、初期ヘイズは０．６％で○の評価であった。 As shown in Table 1, the coefficient of linear thermal expansion of the film is 43 ppm / ° C., the retardation R 0 is an evaluation of ○ at 5.0 nm, the tear strength is an evaluation of ○ at 72 N / mm, and the initial haze is The evaluation was ○ at 0.6%.
　［比較例１］
　環状オレフィン系樹脂を１００ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Comparative Example 1]
A film having a thickness of 80 μm was produced in the same manner as in Example 1 except that 100 vol% of the cyclic olefin resin was blended.
　表１に示すように、フィルムの線熱膨張係数は６５ｐｐｍ／℃であり、リタデーションＲ0は０．４ｎｍで○の評価であり、引裂き強度は５５Ｎ／ｍｍで○の評価であり、初期ヘイズは０．２％で○の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 65 ppm / ° C., the retardation R 0 is 0.4 nm, and the tear strength is 55 N / mm, and the initial haze is The evaluation was ○ at 0.2%.
　［比較例２］
　環状オレフィン系樹脂を９０ｖｏｌ％、及びスチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Comparative Example 2]
A film having a thickness of 80 μm was prepared in the same manner as in Example 1 except that 90 vol% of the cyclic olefin resin and 10 vol% of Tuftec H1041 as a styrene elastomer were blended.
　表１に示すように、フィルムの線熱膨張係数は６２ｐｐｍ／℃であり、リタデーションＲ0は２．０ｎｍで○の評価であり、引裂き強度は９０Ｎ／ｍｍで○の評価であり、初期ヘイズは０．５％で○の評価であった。 As shown in Table 1, the coefficient of linear thermal expansion of the film is 62 ppm / ° C., the retardation R 0 is 2.0 nm, and the evaluation is ○, the tear strength is 90 N / mm, and the initial haze is The evaluation was ○ at 0.5%.
　［比較例３］
　環状オレフィン系樹脂を６０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＡｌ2Ｏ3を３０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Comparative Example 3]
A film having a thickness of 80 μm in the same manner as in Example 1 except that 60 vol% of cyclic olefin resin, 10 vol% of Tuftec H1041 as styrene elastomer, and 30 vol% of Al 2 O 3 as inorganic oxide fine particles were blended. Was made.
　表１に示すように、フィルムの線熱膨張係数は３８ｐｐｍ／℃であり、リタデーションＲ0は４．７ｎｍで○の評価であり、引裂き強度は６３Ｎ／ｍｍで○の評価であり、初期ヘイズは２．８％で×の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 38 ppm / ° C., the retardation R 0 is an evaluation of ○ at 4.7 nm, the tear strength is an evaluation of ○ at 63 N / mm, and the initial haze is The evaluation was x at 2.8%.
　［比較例４］
　環状オレフィン系樹脂を６０ｖｏｌ％、スチレン系エラストマーとしてタフテックＨ１０４１を１０ｖｏｌ％、及び無機酸化物微粒子としてＳｉＯ2を３０ｖｏｌ％配合した以外は、実施例１と同様にして、厚さが８０μｍのフィルムを作製した。 [Comparative Example 4]
A film having a thickness of 80 μm was prepared in the same manner as in Example 1 except that 60 vol% of cyclic olefin resin, 10 vol% of tuftec H1041 as styrene elastomer, and 30 vol% of SiO 2 as inorganic oxide fine particles were blended. did.
　表１に示すように、フィルムの線熱膨張係数は３８ｐｐｍ／℃であり、リタデーションＲ0は４．５ｎｍで○の評価であり、引裂き強度は６３Ｎ／ｍｍで○の評価であり、初期ヘイズは３．４％で×の評価であった。 As shown in Table 1, the linear thermal expansion coefficient of the film is 38 ppm / ° C., the retardation R 0 is 4.5 nm, and the tear strength is 63 N / mm, and the initial haze is The evaluation was x at 3.4%.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　比較例１は、スチレン系エラストマーを添加していないため、引裂き強度が６０Ｎ／ｍｍ未満であった。また、比較例２は、無機酸化物微粒子を添加していないため線熱膨張係数が低下していない。また、無機酸化物微粒子の添加量が３０ｖｏｌ％である比較例３，４は、線熱膨張係数が４０ｐｐｍ／℃未満で非常に好ましいが、初期ヘイズが１．５％を超え、光学フィルムとしての使用が困難であった。 Comparative Example 1 had a tear strength of less than 60 N / mm because no styrene elastomer was added. In Comparative Example 2, since the inorganic oxide fine particles are not added, the linear thermal expansion coefficient does not decrease. In addition, Comparative Examples 3 and 4 in which the amount of inorganic oxide fine particles added is 30 vol% is very preferable when the linear thermal expansion coefficient is less than 40 ppm / ° C., but the initial haze exceeds 1.5%, It was difficult to use.
　一方、実施例１～６は、環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを含有するため、線熱膨張係数を４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下に低下させ、面内方向のリタデーションＲ0を１０ｎｍ以下、引裂き強度を６０Ｎ／ｍｍ以上、ヘイズを１．０％以下とすることができた。また、実施例１～６と比較例３，４との比較より、無機酸化物微粒子の添加量が３０ｖｏｌ％未満であることにより、無機酸化物微粒子の凝集を抑制し、初期ヘイズの上昇を防ぐことができることがわかった。 On the other hand, since Examples 1 to 6 contain a cyclic olefin resin, a styrene elastomer, and inorganic oxide fine particles, the linear thermal expansion coefficient is lowered to 40 ppm / ° C. or more and 60 ppm / ° C. or less, and the in-plane direction is reduced. The retardation R 0 was 10 nm or less, the tear strength was 60 N / mm or more, and the haze was 1.0% or less. Further, from the comparison between Examples 1 to 6 and Comparative Examples 3 and 4, the addition amount of the inorganic oxide fine particles is less than 30 vol%, thereby suppressing the aggregation of the inorganic oxide fine particles and preventing the initial haze from increasing. I found out that I could do it.
　＜４．２　第２の実施例＞
　次に、熱膨張係数を低下させた技術的意義を確認するために、“たわみ”に関する実験を行なった。ここでは、図１１に示すように、８０μｍ厚みの環状オレフィン系樹脂組成物フィルム１６０と、光学基材として多用される１００μｍ厚みのＰＥＴ（ポリエチレンテレフタレート、線熱膨張係数２０ｐｐｍ／℃）フィルム１７０とを接着剤層を介して積層した試験片を使用した。そして、試験片の片側を治具１８０にて挟み、試験片を治具から水平方向に３０ｍｍ突き出した状態で、１０５℃の温度雰囲気下に１０分間放置した後、たわみ量を測定した。なお、試験片の自重の影響を無視できるものとして、ＰＥＴフィルム１７０を下側に配置した。 <4.2 Second Embodiment>
Next, in order to confirm the technical significance of lowering the thermal expansion coefficient, an experiment on “deflection” was conducted. Here, as shown in FIG. 11, an 80 μm-thick cyclic olefin-based resin composition film 160 and a 100 μm-thick PET (polyethylene terephthalate, linear thermal expansion coefficient 20 ppm / ° C.) film 170 that is frequently used as an optical substrate. A test piece laminated through an adhesive layer was used. Then, one side of the test piece was sandwiched between jigs 180, and the test piece was left in a temperature atmosphere of 105 ° C. for 10 minutes with the test piece protruding 30 mm horizontally from the jig, and then the amount of deflection was measured. In addition, the PET film 170 was arrange | positioned on the lower side that the influence of the dead weight of a test piece can be disregarded.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２に示すように、環状オレフィン系樹脂組成物フィルム１６０として、比較例１のフィルムを積層した場合、重力方向へのたわみ量は１１ｍｍであった。一方、実施例４のフィルムを積層した場合、重力方向へのたわみ量は５ｍｍであり、改善が見られた。すなわち、環状オレフィン系樹脂組成物フィルム１６０とＰＥＴフィルム１７０との線熱膨張係数差を小さくすることにより、たわみを抑制することができた。 As shown in Table 2, when the film of Comparative Example 1 was laminated as the cyclic olefin-based resin composition film 160, the amount of deflection in the direction of gravity was 11 mm. On the other hand, when the film of Example 4 was laminated | stacked, the deflection amount to the gravitational direction was 5 mm, and the improvement was seen. That is, by reducing the difference in coefficient of linear thermal expansion between the cyclic olefin-based resin composition film 160 and the PET film 170, the deflection could be suppressed.
　１１　環状オレフィン系樹脂、１２　スチレン系エラストマー、１３　無機酸化物微粒子、２１　ダイ、２２　ロール、２３　樹脂材料、３１　位相差フィルム、３２　ハードコート層、３３　透明導電層、３４　モスアイ形状の構造体、４０　タッチパネル、４１　第１の透明導電性フィルム、４２　第２の透明導電性フィルム、４３　貼り合わせ層、４４　表示装置、４５　貼り合わせ部、４６　ガラス基板、４７　貼り合わせ層、４８　偏光子、４９　フロントパネル、５０　貼り合わせ層、５１　貼り合わせ層、１００　テレビ装置、１０１　表示部、１１０　デジタルカメラ、１１１　発光部、１１２　表示部、１１３　メニュースイッチ、１１４　シャッターボタン、１２０　ノート型パーソナルコンピュータ、１２１　本体部、１２２　キーボード、１２３　表示部、１３０　ビデオカメラ、１３１　本体部、１３２　レンズ、１３３　スタート／ストップスイッチ、１３４　表示部、１４０　携帯電話、１４１　表示部、１５０　タブレット型コンピュータ、１５１　表示部、１６０　環状オレフィン系樹脂組成物フィルム、１７０　ＰＥＴフィルム、１８０　治具 11 cyclic olefin resin, 12 styrene elastomer, 13 inorganic oxide fine particles, 21 die, 22 roll, 23 resin material, 31 retardation film, 32 hard coat layer, 33 transparent conductive layer, 34 moth-eye-shaped structure, 40 Touch panel, 41 first transparent conductive film, 42 second transparent conductive film, 43 bonding layer, 44 display device, 45 bonding portion, 46 glass substrate, 47 bonding layer, 48 polarizer, 49 front panel , 50 bonded layers, 51 bonded layers, 100 TV device, 101 display unit, 110 digital camera, 111 light emitting unit, 112 display unit, 113 menu switch, 114 shutter button, 120 notebook personal computer, 121 body , 122 keyboard, 123 display unit, 130 video camera, 131 main body unit, 132 lens, 133 start / stop switch, 134 display unit, 140 mobile phone, 141 display unit, 150 tablet computer, 151 display unit, 160 cyclic olefin system Resin composition film, 170 PET film, 180 jig

Claims (11)

  1. 　環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを含有し、
    　線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である環状オレフィン系樹脂組成物フィルム。     Containing a cyclic olefin-based resin, a styrene-based elastomer, and inorganic oxide fine particles,
    A cyclic olefin-based resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. or more and 60 ppm / ° C. or less.
  2. 　前記無機酸化物微粒子の添加量が、３０ｖｏｌ％未満である請求項１記載の環状オレフィン系樹脂組成物フィルム。 The cyclic olefin-based resin composition film according to claim 1, wherein the amount of the inorganic oxide fine particles added is less than 30 vol%.
  3. 　前記無機酸化物微粒子の平均粒径が、５０ｎｍ以下である請求項１又は２記載の環状オレフィン系樹脂組成物フィルム。 The cyclic olefin-based resin composition film according to claim 1 or 2, wherein the inorganic oxide fine particles have an average particle size of 50 nm or less.
  4. 　弾性率が、１５００ＭＰａ以上２５００ＭＰａ以下である請求項１乃至３のいずれか１項に記載の環状オレフィン系樹脂組成物フィルム。 The cyclic olefin resin composition film according to any one of claims 1 to 3, wherein the elastic modulus is 1500 MPa or more and 2500 MPa or less.
  5. 　前記環状オレフィン系樹脂が、エチレンとノルボルネンの付加共重合体である請求項１乃至４のいずれか１項に記載の環状オレフィン系樹脂組成物フィルム。 The cyclic olefin resin composition film according to any one of claims 1 to 4, wherein the cyclic olefin resin is an addition copolymer of ethylene and norbornene.
  6. 　前記スチレン系エラストマーが、スチレン／エチレン／ブチレン／スチレンブロック共重合体、スチレン／エチレン／プロピレン／スチレンブロック共重合体、水素添加スチレン／ブタジエンブロック共重合体からなる群より選ばれる１種以上である請求項１乃至５のいずれか１項に記載の環状オレフィン系樹脂組成物フィルム。 The styrene elastomer is at least one selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers. The cyclic olefin resin composition film according to any one of claims 1 to 5.
  7. 　前記請求項１乃至６のいずれか１項に記載の環状オレフィン系樹脂組成物フィルムを基材として備える透明導電性素子。 A transparent conductive element comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6 as a base material.
  8. 　前記請求項１乃至６のいずれか１項に記載の環状オレフィン系樹脂組成物フィルムを備える入力装置。 An input device comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6.
  9. 　前記請求項１乃至６のいずれか１項に記載の環状オレフィン系樹脂組成物フィルムを備える表示装置。 A display device comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6.
  10. 　前記請求項１乃至６のいずれか１項に記載の環状オレフィン系樹脂組成物フィルムを備える電子機器。 Electronic equipment comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6.
  11. 　環状オレフィン系樹脂と、スチレン系エラストマーと、無機酸化物微粒子とを加熱溶融し、
    　前記加熱溶融された環状オレフィン系樹脂組成物を押出法により、フィルム状に押し出し、線熱膨張係数が、４０ｐｐｍ／℃以上６０ｐｐｍ／℃以下である環状オレフィン系樹脂組成物フィルムを得る環状オレフィン系樹脂組成物フィルムの製造方法。     The cyclic olefin resin, the styrene elastomer, and the inorganic oxide fine particles are heated and melted,
    Cyclic olefin resin obtained by extruding the heated and melted cyclic olefin resin composition into a film by an extrusion method to obtain a cyclic olefin resin composition film having a linear thermal expansion coefficient of 40 ppm / ° C. to 60 ppm / ° C. A method for producing a composition film.
PCT/JP2015/063844 2014-05-22 2015-05-14 Cyclic olefin resin composition film WO2015178279A1 (en)

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