WO2012073437A1 - Film optique, dispositif d'affichage d'image et dispositif d'affichage d'image comprenant un panneau tactile - Google Patents

Film optique, dispositif d'affichage d'image et dispositif d'affichage d'image comprenant un panneau tactile Download PDF

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Publication number
WO2012073437A1
WO2012073437A1 PCT/JP2011/006394 JP2011006394W WO2012073437A1 WO 2012073437 A1 WO2012073437 A1 WO 2012073437A1 JP 2011006394 W JP2011006394 W JP 2011006394W WO 2012073437 A1 WO2012073437 A1 WO 2012073437A1
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Prior art keywords
film
optical film
functional layer
mass
base film
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PCT/JP2011/006394
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English (en)
Japanese (ja)
Inventor
岡野　賢
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コニカミノルタオプト株式会社
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Priority to JP2012546678A priority Critical patent/JP5971121B2/ja
Publication of WO2012073437A1 publication Critical patent/WO2012073437A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings

Definitions

  • the present invention relates to an image display device including an optical film, an image display device, and a touch panel.
  • liquid crystal display devices have attracted attention as image display elements, and as one of their uses, application to portable electronic notebooks, portable multimedia devices, and the like is expected.
  • a liquid crystal display element with a transparent touch panel mounted thereon particularly a resistive film type touch panel
  • This resistive film type touch panel generally has a hard coat layer on one side of a film substrate (hereinafter referred to as a hard coat film) and an indium-tin oxide (hereinafter referred to as “ITO”) on the other side.
  • a hard coat film a film substrate
  • ITO indium-tin oxide
  • a panel plate serving as an upper electrode having a conductive film, and a panel plate serving as a lower electrode having a conductive film such as ITO on one surface of a transparent substrate such as a glass substrate via a spacer are usually manufactured separately by a manufacturer that provides a hard coat layer on a film substrate to produce a hard coat film, a manufacturer that provides a conductive film such as ITO on a glass substrate, and a manufacturer that assembles these. Has been.
  • hard coat films used in touch panels are actually used in many cases having a hard coat layer on both sides of a film substrate from the viewpoint of ITO adhesion and curl prevention.
  • Patent Document 1 discloses a technique for preventing blocking by forming surface irregularities having a protruding shape to prevent sticking between films.
  • Patent Document 1 forms surface irregularities having a protrusion shape on a hard coat film by using a curable resin composition for a hard coat layer containing a resin having two or more reactive functional groups and fine particles bonded with a fluorine compound.
  • Patent Document 2 discloses that a technique for forming surface irregularities having a protrusion shape by phase separation of a resin can be used for preventing blocking.
  • a technique for forming surface irregularities having a protrusion shape by phase separation of a resin can be used for preventing blocking.
  • flexibility flexibility
  • the surface unevenness having a protrusion shape is formed by adding phase separation of the resin and further fine particles, there is a problem in that the visibility of the display image is lowered due to the internal haze of the hard coat layer.
  • a method for forming a concavo-convex structure for preventing blocking a method of providing a concavo-convex structure on a film with a surface transfer roll having a concavo-convex structure on the surface is known.
  • the surface transfer roll usually has a roll shape having a diameter of about 5 cm. Therefore, when a concavo-convex structure is formed on a long roll, the surface transfer roll has a period of about 15 cm. Therefore, when unevenness is formed with a surface transfer roll on a very long long film, it is clear that the period of the uneven structure partially matches between the laminated films, causing partial blocking It has become.
  • an object of the present invention is to provide an optical film that prevents blocking and has excellent flexibility, and an optical film that has almost no haze due to internal scattering. Furthermore, it aims at providing the liquid crystal display device containing the image display apparatus which is excellent in the visibility using this optical film, and the touch panel excellent in the damage and peeling of the surface by pen sliding at the time of information input.
  • An optical film according to one aspect of the present invention is an optical film having a hard coat layer on one surface of a base film and a functional layer on the other surface, the functional layer having a period in the length direction. It has no irregular protrusion shape and is substantially free of fine particles or non-reactive polymer.
  • the protrusion shape forming the surface irregularities of the functional layer according to the present invention is an irregular shape having no period in the length direction.
  • the optical film described above has almost no haze due to internal scattering, it provides an image display device that has excellent visibility when used in an image display device and does not cause eye fatigue even when viewed for a long time. Can do.
  • the surface film of a liquid crystal display device including a touch panel can provide an optical film excellent in pen sliding resistance assuming an operating environment in which a pen, a finger, or the like is pushed when inputting information.
  • FIG. 1 is an explanatory view of a protrusion according to the present invention.
  • FIG. 2 is an example when the optical film of the present invention is used for a touch panel.
  • FIG. 3 is a schematic diagram of a liquid crystal display device with a touch panel.
  • FIG. 4 shows the surface of the functional layer 1 of the optical film 1 of the example observed with an optical interference type surface roughness meter.
  • FIG. 5 is a schematic diagram of a conductive optical film.
  • FIG. 6 is a schematic diagram of a resistive film type touch panel.
  • FIG. 7 is a schematic diagram of the inner touch panel.
  • the optical film of the present invention is an optical film having a hard coat layer on one surface on a film substrate and a functional layer on the other surface, and the functional layer has no periodicity in the length direction. It has a characteristic protrusion shape and is substantially free of fine particles or non-reactive polymer.
  • the optical film of the present invention has an optical film that is prevented from blocking in a state where the film is wound in a roll shape and has excellent flexibility, and an optical film free from haze due to internal scattering. It is to provide.
  • the functional layer according to the present invention is composed only of highly compatible resin components without containing fine particles or non-reactive polymer, it is difficult to cause deterioration in the durability test, and durability for outdoor use is assumed.
  • An optical film having excellent flexibility after the property test can be provided.
  • the protrusion shape forming the surface irregularities of the functional layer is not formed by adding fine particles or by molding, and therefore has an irregular state, and the hard coat layer and the functional layer are Even when they are overlapped, the stress is easily dispersed, and an excellent anti-blocking effect can be obtained.
  • an optical film excellent in pen sliding resistance can be provided as a liquid crystal display device including a touch panel.
  • the functional layer which is one feature of the optical film of the present invention will be described.
  • the functional layer has an irregular protrusion shape having no period in the length direction forming the surface irregularities, and is substantially free of fine particles or non-reactive polymer.
  • a length direction means the film forming direction where the composition coating liquid was cast at the time of manufacture of an optical film.
  • “Substantially not contained” means that the content of the fine particles or incompatible resin is 0.01% by mass or less based on the solid content of the functional layer.
  • Non-reactive polymers are compounds that do not have a functional group (polymerizable group) such as an unsaturated double bond, and specifically include (meth) acrylic monomers, acrylic monomers, and copolymerizable monomers. Examples thereof include thermoplastic acrylic resins and cellulose ester resins, which will be described later in terms of a polymer and a base film. Examples of the fine particles include fine particles such as inorganic fine particles and organic fine particles.
  • the inorganic fine particles include silicon oxide, magnesium oxide, and calcium carbonate.
  • the organic particles include polymethacrylic acid methyl acrylate resin powder, acrylic styrene resin powder, polymethyl methacrylate resin powder, polystyrene resin powder, and melamine resin powder. Next, the protrusion shape will be described.
  • the protrusion shape of the present invention is an irregularly shaped protrusion having no period in the length direction.
  • the “irregularly shaped protrusion having no period in the length direction” of the present invention is an irregular shape in which the surface unevenness is not determined in shape or size in the width direction of the film.
  • protrusion shape of the present invention for example, protrusions having different widths and heights such as (a) and (b) shown in FIG. 1 are exemplified as irregularly shaped protrusions, but are not limited thereto.
  • the “irregular arrangement” means that the irregularly-protruding protrusions are not regularly arranged (for example, at regular intervals), but are irregularly arranged at random intervals, It may be isotropic or anisotropic. In addition, protrusions appear on the surface of the functional layer that is not in contact with the base film.
  • the arithmetic average roughness Ra (JIS B0601: 1994) of the functional layer is preferably 130 nm or less, particularly preferably 10 to 130 nm.
  • the arithmetic average roughness Ra within the above range is preferable in that not only the objective effect of the present invention is suitably obtained in a more severe durability test, but also excellent adhesion.
  • the height of the protrusion shape for obtaining the arithmetic average roughness Ra is preferably 2 nm to 4 ⁇ m.
  • the width of the protrusion shape is 50 nm to 300 ⁇ m, preferably 50 nm to 100 ⁇ m.
  • the height and width of the protrusion shape can be obtained from cross-sectional observation. In order to make it easier to understand, FIG. As shown in FIG. 1, the height and width of the protrusion shape are obtained by drawing a center line a on the cross-sectional observation image and forming two peaks b and c and a center line a forming a mountain ridge. The distance between the intersections can be determined as the protrusion size width t, and the distance from the peak to the center line a can be determined as the protrusion size height h.
  • the 10-point average roughness Rz of the functional layer is preferably 10 times or less of the centerline average roughness Ra.
  • the average mountain / valley distance Sm is preferably 5 to 150 ⁇ m, more preferably 20 to 100 ⁇ m.
  • the standard deviation of the height of the convex portion from the deepest portion of the concave and convex portions is preferably 0.5 ⁇ m or less.
  • the standard deviation of the average mountain-valley distance Sm with respect to the center line is preferably 20 ⁇ m or less, and the surface with an inclination angle of 0 to 5 degrees is preferably 10% or more.
  • the arithmetic average roughness Ra, the average mountain valley distance Sm, and the 10-point average roughness Rz are values measured with an optical interference surface roughness meter (for example, RST / PLUS, manufactured by WYKO) according to JIS B0601: 1994. It is.
  • the kurtosis Rku of the functional layer is preferably 3 or less.
  • the kurtosis Rku is a parameter that defines the shape of the convex portion of the concavo-convex shape. The larger the value of the kurtosis Rku, the more the shape of the convex portion of the concavo-convex shape is a pointed shape like a needle. It will be. When the kurtosis Rku exceeds 3, white blurring tends to occur.
  • the kurtosis Rku of the functional layer is more preferably 1.5 to 2.8.
  • the absolute value of the surface distortion Rsk is preferably 1 or less.
  • the skewness Rsk is a parameter indicating the ratio of the convex portion and the concave portion with respect to the average surface of the concavo-convex shape. If there are many convex portions with respect to the average surface, it becomes a positive value and is concave with respect to the average surface If there are many parts, it will become a large negative value. When the absolute value of the skewness Rsk exceeds 1, white blurring tends to occur. The absolute value of the skewness Rsk is preferably 0.01 to 0.5. The kurtosis Rku and the skewness Rsk can be measured using the optical interference surface roughness meter.
  • the optical film of the present invention preferably has an image clarity (transmission image clarity) according to JIS-K7105 of 5 to 90% when measured with an optical comb width of 0.5 mm, and more preferably 5 to 80%. %, Particularly preferably 5 to 60%.
  • image clarity transmission image clarity
  • the protrusion shape may be obtained by, for example, increasing the processing temperature of the rate-decreasing drying section in the drying process of the functional layer coating composition. It can be obtained by a method of controlling, generating a convection of a resin film, creating a non-uniform state on the surface of the functional layer, curing in this non-uniform surface state, and forming a coating film. By forming the coating film by such a method, the film strength of the functional layer is improved. Moreover, the method of controlling the processing temperature of the decreasing rate drying area in the drying process of a functional layer coating composition to high temperature conditions is preferable at the point which is excellent also in productivity.
  • the functional layer according to the present invention preferably contains an actinic radiation curable resin. That is, it is preferable that the main component is a resin that is cured through a crosslinking reaction by irradiation with active rays (also called active energy rays) such as ultraviolet rays and electron beams.
  • active rays also called active energy rays
  • the actinic radiation curable resin a component containing a monomer having an ethylenically unsaturated double bond is preferably used. These resins are cured by irradiating active rays such as ultraviolet rays and electron beams to form an active ray curable resin layer.
  • active rays also called active energy rays
  • Typical examples of the actinic radiation curable resin include ultraviolet curable resins and electron beam curable resins.
  • resins cured by ultraviolet irradiation have excellent mechanical film strength (abrasion resistance, pencil hardness).
  • the ultraviolet curable resin include an ultraviolet curable acrylate resin, an ultraviolet curable urethane acrylate resin, an ultraviolet curable polyester acrylate resin, an ultraviolet curable epoxy acrylate resin, an ultraviolet curable polyol acrylate resin, and an ultraviolet ray.
  • a curable epoxy resin or the like is preferably used. Of these, ultraviolet curable acrylate resins are preferred.
  • polyfunctional acrylate is preferable.
  • the polyfunctional acrylate is preferably selected from the group consisting of pentaerythritol polyfunctional acrylate, dipentaerythritol polyfunctional acrylate, pentaerythritol polyfunctional methacrylate, and dipentaerythritol polyfunctional methacrylate.
  • the polyfunctional acrylate is a compound having two or more acryloyloxy groups or methacryloyloxy groups in the molecule.
  • polyfunctional acrylate monomer examples include ethylene glycol diacrylate, diethylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolethane triacrylate, and tetramethylolmethane triacrylate.
  • Pentaerythrit Preferred examples include tetratetraacrylate, pentaerythritol tetraacrylate, glycerin triacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and active energy ray-curable isocyanurate derivatives. It is done.
  • the active energy ray-curable isocyanurate derivative is not particularly limited as long as it is a compound having a structure in which one or more ethylenically unsaturated groups are bonded to the isocyanuric acid skeleton, but three or more in the same molecule.
  • a compound having an ethylenically unsaturated group and one or more isocyanurate rings is preferred.
  • Adekaoptomer KR / BY series KR-400, KR-410, KR-550, KR-566, KR-567, BY-320B (manufactured by ADEKA Corporation); 101-KK, A-101-WS, C-302, C-401-N, C-501, M-101, M-102, T-102, D-102, NS-101, FT-102Q8, MAG- 1-P20, AG-106, M-101-C (manufactured by Guangei Chemical Co., Ltd.); Seika Beam PHC2210 (S), PHC X-9 (K-3), PHC2213, DP-10, DP-20, DP- 30, P1000, P1100, P1200, P1300, P1400, P1500, P1600, SCR900 (manufactured by Dainichi Seika Kogyo Co., Ltd.); KRM7033, KRM 039, KRM 7130, KRM 7131, UV
  • the actinic radiation curable resin may be used alone or in combination of two or more.
  • the viscosity at 25 ° C. of the actinic radiation curable resin is preferably 20 mPa ⁇ s or more and 2000 mPa ⁇ s or less.
  • the viscosity of the resin is 30 mPa ⁇ s or more, a monomer having a high functionality can be used, and sufficiently excellent curability can be obtained.
  • the viscosity is 2000 mPa ⁇ s or less, the resin is used in the drying step. Sufficient fluidity of the composition (composition comprising an active ray curable resin and an additive other than a solvent) is easily obtained.
  • the viscosity of the actinic radiation curable resin can be measured using a B-type viscometer under the condition of 25 ° C. after stirring and mixing the resin with a disper.
  • low viscosity resins examples include glycerin triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate and the like.
  • the viscosity can be measured using a B-type viscometer at 25 ° C.
  • the functional layer may further contain a monofunctional acrylate.
  • Monofunctional acrylates include isobornyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, isostearyl acrylate, benzyl acrylate, ethyl carbitol acrylate, phenoxyethyl acrylate, lauryl acrylate, isooctyl acrylate, tetrahydrofurfuryl acrylate, behenyl Examples thereof include acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, cyclohexyl acrylate, and the like.
  • Such monofunctional acrylates can be obtained from Nippon Kasei Kogyo Co., Ltd., Shin-Nakamura Chemical Co., Ltd., Osaka Organic Chemical Co., Ltd., etc.
  • polyfunctional acrylate When a monofunctional acrylate is used, it is preferable that polyfunctional acrylate: monofunctional acrylate is contained in a mass ratio of polyfunctional acrylate to monofunctional acrylate of 80:20 to 99: 1.
  • the functional layer contains a photopolymerization initiator in order to accelerate the curing of the actinic radiation curable resin.
  • the amount of the photopolymerization initiator is preferably 20: 100 to 0.01: 100 in terms of mass ratio.
  • Specific examples of the photopolymerization initiator include alkylphenone series, acetophenone, benzophenone, hydroxybenzophenone, Michler's ketone, ⁇ -amyloxime ester, thioxanthone, and derivatives thereof, but are not particularly limited thereto. Is not to be done.
  • photopolymerization initiators Commercially available products may be used as such photopolymerization initiators, and preferred examples include Irgacure 184, Irgacure 907, and Irgacure 651 manufactured by BASF Japan.
  • the functional layer may contain a conductive agent in order to impart antistatic properties.
  • a conductive agent include metal oxide fine particles or ⁇ -conjugated conductive polymers.
  • An ionic liquid is also preferably used as the conductive compound.
  • the functional layer may contain a silicone-based surfactant, a fluorine-based surfactant, an anionic surfactant, and a fluorine-siloxane graft polymer from the viewpoint of coatability.
  • the functional layer may contain a compound having an HLB value of 3 to 18.
  • a compound having an HLB value of 3 to 18 will be described.
  • the HLB value is Hydrophile-Lipophile-Balance, hydrophilic-lipophilic-balance, and is a value indicating the degree of hydrophilicity or lipophilicity of a compound. The smaller the HLB value, the higher the lipophilicity, and the higher the value, the higher the hydrophilicity.
  • the HLB value can be obtained by the following calculation formula.
  • HLB value 20 ⁇ total formula weight of hydrophilic part / molecular weight
  • Emulgen 102KG (6.3), Emulgen 103 (8.1), Emulgen 104P (9.6), Emulgen 105 (9.7), Emulgen 106 (10.5), Emulgen 108 (12 .1), Emulgen 109P (13.6), Emulgen 120 (15.3), Emulgen 123P (16.9), Emulgen 147 (16.3), Emulgen 210P (10.7), Emulgen 220 (14.2) ), Emulgen 306P (9.4), Emulgen 320P (13.9), Emulgen 404 (8.8), Emulgen 408 (10.0), Emulgen 409PV (12.0), Emulgen 420 (13.6), Emulgen 430 (16.2), Emulgen 705 (10.5), Emulgen 707 (12.1), Emulgen 7 9 (13.3), Emulgen 1108 (13.5), Emulgen 1118S-70 (16.4), Emulgen 1135S-70 (17.9), Emulgen 2020G-HA (13.0), Emulgen
  • Emulgen LS-106 (12.5), Emulgen LS-110 (13.4), Emulgen LS-114 (14.0), manufactured by Nissin Chemical Industry Co., Ltd .: Surfinol 104E (4), Surfy Nord 104H (4), Surfinol 104A (4), Surfinol 104BC (4), Surfinol 104DPM (4), Surfinol 104PA (4), Surfinol 104PG-50 (4), Surfinol 104S (4), Surfinol 420 (4), Surfinol 440 (8), Surfinol 465 13), Surfinol 485 (17), Surfinol SE (6), manufactured by Shin-Etsu Chemical Co., Ltd .: X-22-4272 (7), X-22-6266 (8), KF-351 (12), KF-352 (7), KF-353 (10), KF-354L (16), KF-355A (12), KF-615A (10), KF-945 (4), KF-618
  • silicone surfactant examples include polyether-modified silicone, and the KF series manufactured by Shin-Etsu Chemical Co., Ltd. can be used.
  • acrylic copolymer examples include commercially available compounds such as BYK-350 and BYK-352 manufactured by BYK Japan.
  • fluorosurfactant examples include MegaFuck® RS series manufactured by DIC Corporation, MegaFuck F-444 MegaFuck F-556, and the like.
  • the fluorine-siloxane graft polymer refers to a copolymer polymer obtained by grafting polysiloxane and / or organopolysiloxane containing siloxane and / or organosiloxane alone on at least a fluorine resin.
  • fluorine-siloxane graft polymers can be prepared by methods as described in the examples below.
  • commercially available products include ZX-022H, ZX-007C, ZX-049, ZX-047-D manufactured by Fuji Kasei Kogyo Co., Ltd.
  • the functional layer may further contain an ultraviolet absorber described in the base film described later. When the ultraviolet absorber is contained, the film is preferably composed of two or more functional layers, and the functional layer in contact with the base film preferably contains the ultraviolet absorber.
  • the ultraviolet absorber: functional layer constituting resin is contained in a mass ratio of 0.01: 100 to 10: 100.
  • the thickness of the functional layer in contact with the base film is preferably in the range of 0.05 to 2 ⁇ m.
  • Two or more stacked layers may be formed by sequential multilayers or by simultaneous multilayers.
  • the simultaneous multi-layering is a method of forming a functional layer by applying two or more functional layers on a base film in a wet-on-wet manner without going through a drying step.
  • the layers are stacked one after another with an extrusion coater or simultaneously with a slot die having a plurality of slits. Can be done.
  • the functional layer is a functional layer composition obtained by diluting the above-mentioned components forming the functional layer with a solvent that swells or partially dissolves the base film, and this functional layer composition is formed into a film by the following method. It is preferably provided by applying, drying and curing on a substrate.
  • Solvents include ketones (methyl ethyl ketone, acetone, cyclohexanone, methyl isobutyl ketone, etc.), acetate esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (methanol, ethanol, etc.), glycol ethers (propylene glycol monomethyl ether, diethylene glycol monomethyl) Ethers, etc.) are preferred, and among these solvents, ketones, esters and glycol ethers are preferred.
  • the functional layer composition is applied to the base film, and then the functional layer composition In the process of forming the functional layer while the solvent evaporates, convection of the resin is likely to occur, and as a result, the surface roughness is irregular in the longitudinal direction and has irregular projections on the base film. This is preferable because it easily develops and the arithmetic average roughness Ra is easy to control.
  • the coating amount of the functional layer composition forming the functional layer is suitably 0.1 to 40 ⁇ m, preferably 0.5 to 30 ⁇ m, as the wet film thickness.
  • the average film thickness is suitably 0.05 to 20 ⁇ m, preferably 1 to 10 ⁇ m, as a dry film thickness.
  • known methods such as a gravure coater, a dip coater, a reverse coater, a wire bar coater, a die coater, and an ink jet method can be used.
  • the functional layer is coated with a functional layer composition that forms a functional layer using these coating methods, dried after application, and irradiated with actinic radiation (also referred to as UV curing treatment), and further if necessary.
  • the heat treatment temperature after UV curing is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and particularly preferably 120 ° C. or higher.
  • Drying is preferably performed by high-temperature treatment at a temperature of 90 ° C. or higher in the rate of drying section. More preferably, the temperature of the decreasing rate drying section is 90 ° C or higher and 140 ° C or lower.
  • the temperature of the rate-decreasing drying section high-temperature treatment, convection occurs in the coating resin during the formation of the functional layer, so that irregular surface roughness is likely to appear on the surface of the functional layer, and the arithmetic mean described above This is preferable because it is easy to control the roughness Ra.
  • the drying process changes from a constant state to a gradually decreasing state when drying starts.
  • the decreasing section is called the decreasing rate drying section.
  • the constant rate drying section the amount of heat flowing in is all consumed for solvent evaporation on the coating film surface, and when the solvent on the coating film surface decreases, the evaporation surface moves from the surface to the inside and enters the decreasing rate drying section. Thereafter, the temperature of the coating film surface rises and approaches the hot air temperature, so that the temperature of the actinic radiation curable resin composition rises, the resin viscosity decreases, and the fluidity increases.
  • any light source that generates ultraviolet rays can be used without limitation.
  • a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • Irradiation conditions vary depending on each lamp, but the irradiation amount of active rays is usually 50 to 1000 mJ / cm 2 , preferably 50 to 300 mJ / cm 2 .
  • the tension to be applied is preferably 30 to 300 N / m.
  • the method for applying the tension is not particularly limited, and the tension may be applied in the conveying direction on the back roll, or the tension may be applied in the width direction or biaxial direction by a tenter. Thereby, a film having further excellent flatness can be obtained.
  • the hard coat layer As a component which forms a hard-coat layer, the component described by description of the functional layer can be used.
  • the film thickness is preferably in the range described above for the functional layer.
  • the hard coat layer can be formed by a method of coating, drying, curing, and heat-treating, if necessary, on the film substrate on which the functional layer is provided.
  • the hard coat layer has an arithmetic average roughness Ra of preferably less than 10 nm, and more preferably less than 2 nm. If Ra is the said range, a very smooth surface will be obtained and the visibility at the time of using for an image display apparatus will be obtained suitably.
  • the haze resulting from internal scattering of the optical film (hereinafter also referred to as internal haze) is preferably 0 to 1%. By satisfactorily suppressing internal scattering, excellent visibility can be obtained when the optical film according to the present invention is used in an image display device.
  • the internal haze can be measured by the following procedure. A few drops of silicone oil are dropped on the front and back surfaces of the optical film so that they are optically intimately attached from the front and back with two 1 mm thick glass plates (micro slide glass, product number S9111, manufactured by Matsunami Glass Industry Co., Ltd.) In this state, haze (Ha) is measured according to JIS K7136.
  • the internal haze (Hi) is calculated by subtracting the glass haze (Hb) from the haze (Ha).
  • the internal haze of the optical film is preferably 0.2 to 20%.
  • the optical film in the present invention has a pencil hardness, which is an index of hardness, of H or higher, more preferably 3H or higher. If it is 3H or more, it exhibits excellent mechanical properties when used as a surface protective film for large image display devices and digital signage image display devices that are often used in outdoor applications.
  • the pencil hardness is determined by adjusting the humidity of the produced optical film at a temperature of 23 ° C. and a relative humidity of 55% for 2 hours or more, and then using a test pencil specified by JIS S 6006 under a load of 500 g. It is the value which measured the functional layer according to the pencil hardness evaluation method prescribed
  • the base film is easy to manufacture, easily adheres to the functional layer and the hard coat layer, and has optical isotropy.
  • cellulose ester film such as triacetyl cellulose film, cellulose acetate propionate film, cellulose diacetate film, cellulose acetate butyrate film, polyethylene terephthalate, polyethylene naphthalate, etc.
  • Polyester film such as phthalate, polycarbonate film, polyarylate film, polysulfone (including polyethersulfone) film, polyethylene film, polypropylene film, cellophane, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, Shinji Otectic polystyrene film, norbornene resin film, polymethylpente Films, polyether ketone films, polyether ketone imide film, a polyamide film, a fluorine resin film, nylon film, can be used cycloolefin polymer film, a polymethylmethacrylate film, or an acrylic film.
  • cellulose ester films for example, Konica Minoltac KC8UX, KC4UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC4UE, KC4UE, and KC12UR (above, manufactured by Konica Minolta Opto, Polycarbonate Film)
  • An olefin polymer film and a polyester film are preferable, and in the present invention, the cellulose ester film is preferable from the viewpoint of ease of obtaining the above-described protrusion shape from the functional layer, productivity, and cost.
  • the refractive index of the base film is preferably 1.30 to 1.70, and more preferably 1.40 to 1.65.
  • the refractive index is measured by the method of JIS K7142 using an Abbe refractometer 2T manufactured by Atago Co., Ltd.
  • the cellulose ester film is not particularly limited as long as it has the above properties, but the cellulose ester resin (hereinafter also referred to as cellulose ester) is preferably a lower fatty acid ester of cellulose.
  • the lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 6 or less carbon atoms.
  • mixed fatty acid esters such as cellulose acetate butyrate can be used.
  • cellulose lower fatty acid esters particularly preferably used are cellulose diacetate, cellulose triacetate, and cellulose acetate propionate. These cellulose esters can be used alone or in combination.
  • Cellulose diacetate preferably has an average degree of acetylation (amount of bound acetic acid) of 51.0 to 56.0%.
  • Commercially available products include L20, L30, L40, and L50 manufactured by Daicel Corporation, and Ca398-3, Ca398-6, Ca398-10, Ca398-30, and Ca394-60S manufactured by Eastman Chemical Japan Co., Ltd. Can be mentioned.
  • the cellulose triacetate preferably has an average degree of acetylation (bound acetic acid amount) of 54.0 to 62.5%, and more preferably cellulose triacetate having an average degree of acetylation of 58.0 to 62.5%. is there.
  • Cellulose triacetate has an acetyl group substitution degree of 2.80 to 2.95, a number average molecular weight (Mn) of 125,000 or more and less than 155000, a weight average molecular weight (Mw) of 265,000 or more and less than 310,000, Mw Cellulose triacetate A / Mn of 1.9 to 2.1, acetyl group substitution degree of 2.75 to 2.90, Mn of 155000 or more and less than 180,000, Mw of 290000 or more and less than 360,000 It is preferable to contain cellulose triacetate B having Mw / Mn of 1.8 to 2.0.
  • Cellulose acetate propionate has an acyl group having 2 to 4 carbon atoms as a substituent, and when the substitution degree of acetyl group is X and the substitution degree of propionyl group or butyryl group is Y, the following formula (I ) And (II) are preferably satisfied at the same time.
  • the Mn and Mw of the cellulose ester can be measured using high performance liquid chromatography.
  • the measurement conditions are as follows.
  • Solvent Methylene chloride Column: Shodex K806, K805, K803G (Used by connecting three Showa Denko Co., Ltd.) Column temperature: 25 ° C Sample concentration: 0.1% by mass Detector: RI Model 504 (GL Science Co., Ltd.) Pump: L6000 (manufactured by Hitachi, Ltd.) Flow rate: 1.0 ml / min Calibration curve: Standard polystyrene STK standard polystyrene (manufactured by Tosoh Corporation) A calibration curve of 13 samples with Mw of 1,000,000 to 500 was used. The 13 samples are preferably used at approximately equal intervals.
  • the base film contains a thermoplastic acrylic resin and a cellulose ester resin, and the mass ratio of the thermoplastic acrylic resin and the cellulose ester resin is 95: 5 to 50:50 of the thermoplastic acrylic resin: cellulose ester resin.
  • a cellulose ester resin / thermoplastic acrylic resin-containing film may be used.
  • Acrylic resin includes methacrylic resin.
  • the acrylic resin is not particularly limited but is preferably composed of 50 to 99% by mass of methyl methacrylate units and 1 to 50% by mass of other monomer units copolymerizable therewith.
  • Examples of other copolymerizable monomers include alkyl methacrylates having 2 to 18 alkyl carbon atoms, alkyl acrylates having 1 to 18 carbon atoms, alkyl acrylates such as acrylic acid and methacrylic acid.
  • Unsaturated group-containing divalent carboxylic acids such as saturated acid, maleic acid, fumaric acid and itaconic acid, aromatic vinyl compounds such as styrene and ⁇ -methylstyrene, ⁇ , ⁇ -unsaturated nitriles such as acrylonitrile and methacrylonitrile, Examples thereof include maleic anhydride, maleimide, N-substituted maleimide, glutaric anhydride and the like, and these can be used alone or in combination of two or more monomers.
  • methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate, and the like are preferable from the viewpoint of thermal decomposition resistance and fluidity of the copolymer.
  • n-Butyl acrylate is particularly preferably used.
  • Mw is preferably from 80000 to 500000, more preferably from 110000 to 500000.
  • the Mw of the acrylic resin can be measured by gel permeation chromatography.
  • a polymerization method of an acrylic resin You may employ
  • the polymerization initiator a normal peroxide polymerization initiator and an azo polymerization initiator can be used, and a redox polymerization initiator can also be used.
  • Regarding the polymerization temperature 30 to 100 ° C. can be employed for suspension or emulsion polymerization, and 80 to 160 ° C. can be employed for bulk or solution polymerization.
  • polymerization can be carried out using a chain transfer agent such as an alkyl mercaptan.
  • chain transfer agents can also be used.
  • Delpet 60N, 80N (Asahi Kasei Chemicals Co., Ltd.), Dianal BR52, BR80, BR83, BR85, BR88 (Mitsubishi Rayon Co., Ltd.), KT75 (Electric Chemical Co., Ltd.), etc. are used. be able to.
  • Two or more acrylic resins can be used in combination.
  • the acrylic resin may be a graft copolymer obtained by grafting a (meth) acrylic resin to a copolymer of (meth) acrylic rubber and an aromatic vinyl compound.
  • a copolymer of (meth) acrylic rubber and an aromatic vinyl compound forms a core, and the (meth) acrylic resin forms a shell around the copolymer.
  • -A shell-type graft copolymer is preferred.
  • the total mass of the acrylic resin and the cellulose ester resin in the base film is preferably 55% by mass or more of the base film, more preferably 60% by mass or more, and particularly preferably 70% by mass or more.
  • the base film may be configured to contain resins and additives other than thermoplastic acrylic resins and cellulose ester resins.
  • the base film may contain acrylic particles from the viewpoint of improving brittleness.
  • An acrylic particle represents the acrylic component which exists in the state of particle
  • the acrylic particles are not particularly limited, but are preferably multi-layered acrylic granular composites.
  • multi-layered acrylic granular composites include “Metablene” manufactured by Mitsubishi Rayon Co., Ltd., “Kaneace” manufactured by Kaneka Chemical Co., Ltd., “Paraloid” manufactured by Kureha Chemical Industry Co., Ltd., Rohm and Examples include “Acryloid” manufactured by Haas, “Staffyroid” manufactured by Gantz Kasei Kogyo Co., Ltd., “Parapet SA” manufactured by Kuraray Co., Ltd., and the like. These may be used alone or in combination of two or more.
  • the refractive index of the mixture of the acrylic resin and the cellulose ester resin is close to the refractive index of the acrylic particles in order to obtain a highly transparent film.
  • the refractive index difference between the acrylic particles and the acrylic resin is preferably 0.05 or less, more preferably 0.02 or less, and still more preferably 0.01 or less.
  • the acrylic fine particles have a total mass ratio of acrylic fine particles: acrylic resin and cellulose ester resin in the range of 0.5: 100 to 30: 100 with respect to the total mass of the acrylic resin and cellulose ester resin constituting the film.
  • the content is preferably from the viewpoint that the intended effect is better exhibited, and more preferably, the total mass of the acrylic fine particles: acrylic resin and cellulose ester resin is in the range of 1.0: 100 to 15: 100.
  • the base film according to the present embodiment includes, for example, silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydrated calcium silicate, silica It is preferable to contain a matting agent such as inorganic fine particles such as aluminum oxide, magnesium silicate and calcium phosphate, and a crosslinked polymer.
  • silicon dioxide is preferably used because it can reduce the haze of the film.
  • the primary average particle diameter of the fine particles is preferably 20 nm or less, more preferably 5 to 16 nm, and particularly preferably 5 to 12 nm.
  • a plasticizer can also be used in combination with the base film in order to improve the fluidity and flexibility of the composition.
  • the plasticizer include phthalate esters, fatty acid esters, trimellitic esters, phosphate esters, polyesters, sugar esters, acrylic polymers, and the like. Of these, polyester, sugar ester and acrylic polymer plasticizers are preferably used. Polyester plasticizers are superior in non-migration and extraction resistance compared to phthalate ester plasticizers such as dioctyl phthalate. It can be applied to a wide range of uses by selecting or using these plasticizers according to the use.
  • the acrylic polymer is preferably a homopolymer or copolymer of acrylic acid or methacrylic acid alkyl ester.
  • acrylate monomer examples include methyl acrylate, ethyl acrylate, propyl acrylate (i-, n-), butyl acrylate (n-, i-, s-, t-), pentyl acrylate ( n-, i-, s-), hexyl acrylate (n-, i-), heptyl acrylate (n-, i-), octyl acrylate (n-, i-), nonyl acrylate (n-, i-), myristyl acrylate (n-, i-), acrylic acid (2-ethylhexyl), acrylic acid ( ⁇ -caprolactone), acrylic acid (2-hydroxyethyl), acrylic acid (2-hydroxypropyl), acrylic Acid (3-hydroxypropyl), acrylic acid (4-hydroxybutyl), acrylic acid (2-hydroxybutyl), acrylic acid (2-methoxyethyl), acrylic acid 2-ethoxyethyl), etc., or
  • the acrylic polymer is a homopolymer or copolymer of the above-mentioned monomers, but the acrylic acid methyl ester monomer unit is preferably 30% by mass or more, and the methacrylic acid methyl ester monomer unit is preferably 40% by mass or more. In particular, a homopolymer of methyl acrylate or methyl methacrylate is preferred.
  • the polyester plasticizer is a reaction product of a monovalent or tetravalent carboxylic acid and a monovalent or hexavalent alcohol, and is mainly obtained by reacting a divalent carboxylic acid with a glycol.
  • Representative divalent carboxylic acids include glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, sebacic acid and the like.
  • the polyester plasticizer is preferably an aromatic terminal ester plasticizer.
  • the aromatic terminal ester plasticizer is preferably an ester compound having a structure obtained by reacting phthalic acid, adipic acid, at least one benzene monocarboxylic acid and at least one alkylene glycol having 2 to 12 carbon atoms. It is sufficient that the structure of such a compound has an adipic acid residue and a phthalic acid residue. When manufacturing an ester compound, you may make it react as an acid anhydride or esterified substance of dicarboxylic acid.
  • benzene monocarboxylic acid component examples include benzoic acid, para-tert-butylbenzoic acid, orthotoluic acid, metatoluic acid, p-toluic acid, dimethylbenzoic acid, ethylbenzoic acid, normal propylbenzoic acid, aminobenzoic acid, acetoxybenzoic acid and the like. Most preferred is benzoic acid. Moreover, these can each be used as a 1 type, or 2 or more types of mixture.
  • alkylene glycol component having 2 to 12 carbon atoms examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,2-propanediol, 2-methyl-1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2,2-diethyl-1 , 3-propanediol (3,3-dimethylolpentane), 2-n-butyl-2-ethyl-1,3-propanediol (3,3-dimethylolheptane), 3-methyl-1,5-pentane Diol, 1,6-hexanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl 1,3-he
  • 1,2-propylene glycol is particularly preferred. These glycols may be used as one kind or a mixture of two or more kinds.
  • the aromatic terminal ester plasticizer may be either an oligoester type or a polyester type, and the molecular weight is preferably in the range of 100 to 10,000, but is preferably in the range of 350 to 3000.
  • the acid value is 1.5 mgKOH / g or less, the hydroxyl value is 25 mgKOH / g or less, more preferably the acid value is 0.5 mgKOH / g or less, and the hydroxyl value is 15 mgKOH / g or less.
  • the sugar ester compound is a compound obtained by esterifying all or a part of OH groups of sugars such as the following monosaccharides, disaccharides, trisaccharides or oligosaccharides. ) And the like.
  • R 1 to R 8 represent a substituted or unsubstituted alkylcarbonyl group having 2 to 22 carbon atoms, or a substituted or unsubstituted arylcarbonyl group having 2 to 22 carbon atoms, and R 1 to R 8 May be the same or different.
  • the base film preferably contains an ultraviolet absorber.
  • the ultraviolet absorber include benzotriazole-based, 2-hydroxybenzophenone-based, and salicylic acid phenyl ester-based ultraviolet absorbers.
  • 2- (5-methyl-2-hydroxyphenyl) benzotriazole 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2H-benzotriazole
  • 2- (3 Triazoles such as 5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone
  • Benzophenones such as
  • UV absorbers with a molecular weight of 400 or more are difficult to volatilize at high boiling points and are difficult to disperse even during high temperature molding, so that the weather resistance can be effectively improved with a relatively small amount of addition. Can do.
  • Examples of the ultraviolet absorber having a molecular weight of 400 or more include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- (1, 1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol], bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis ( Hindered amines such as 1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonic acid Bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl L] -4- [3- (3,5-di-t-butyl
  • 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole and 2,2-methylenebis [4- (1,1,3,3- Tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol] is particularly preferred.
  • Commercially available products may be used, and for example, TINUVIN such as TINUVIN 109, TINUVIN 171, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, and TINUVIN 928 manufactured by BASF Japan Ltd. can be preferably used.
  • antioxidants can also be added to the base film in order to improve the thermal decomposability and thermal colorability during molding. It is also possible to add an antistatic agent to give the base film antistatic performance.
  • a flame retardant acrylic resin composition containing a phosphorus flame retardant may be used.
  • Phosphorus flame retardants used here include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphorus. Examples thereof include one or a mixture of two or more selected from acid esters, halogen-containing condensed phosphates, halogen-containing condensed phosphonates, halogen-containing phosphites, and the like.
  • triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) Examples thereof include phosphate and tris (tribromoneopentyl) phosphate.
  • the softening point of the base film an image display device typified by a liquid crystal display device has been increased in size, and the luminance of the backlight light source has been increasing, and in addition to outdoor applications such as digital signage.
  • the base film has a heat resistance of 105 to 145 ° C., particularly 110 to 130. It is preferable that it is ° C.
  • a Tensilon tester (ORIENTEC Co., RTC-1225A) is used to cut out the optical film at 120 mm (length) ⁇ 10 mm (width) and pull it with a tension of 10 N.
  • the temperature can be continuously increased at a temperature increase rate of 30 ° C./min, and the temperature at 9 N can be measured three times, and the average value can be obtained.
  • the glass transition temperature is determined by using a differential scanning calorimeter (DSC-7, manufactured by Perkin Elmer) at a heating rate of 20 ° C./min, and determined in accordance with JIS K7121 (1987). Tmg).
  • the substrate film preferably has a defect of 5 ⁇ m or more in diameter of 1 piece / 10 cm square or less. More preferably, it is 0.5 piece / 10 cm square or less, more preferably 0.1 piece / 10 cm square or less.
  • the diameter of the defect indicates the diameter when the defect is circular, and when the defect is not circular, the range of the defect is determined by observing with a microscope by the following method, and the maximum diameter (diameter of circumscribed circle) is determined.
  • the range of the defect is the size of the shadow when the defect is observed with the transmitted light of the differential interference microscope when the defect is a bubble or a foreign object.
  • the defect is a change in the surface shape such as transfer of a roll flaw or an abrasion
  • the size can be confirmed by observing the defect with the reflected light of a differential interference microscope.
  • the film may be broken and the productivity may be lowered with the defects as a starting point.
  • the diameter of a defect becomes 5 micrometers or more, it can confirm visually by polarizing plate observation etc., and when used as an optical member, a bright spot may arise.
  • the coating film may not be formed uniformly, resulting in defects (coating defects).
  • the defect is a void in the film (foaming defect) generated due to the rapid evaporation of the solvent in the drying process of the solution casting, a foreign substance in the film forming stock solution, or a foreign substance mixed in the film forming process. This refers to the foreign matter (foreign matter defect) in the film.
  • the base film preferably has a breaking elongation in at least one direction of 10% or more, more preferably 20% or more, in the measurement based on JIS-K7127-1999.
  • the upper limit of the elongation at break is not particularly limited, but is practically about 250%. In order to increase the elongation at break, it is effective to suppress defects in the film caused by foreign matter and foaming.
  • the base film preferably has a total light transmittance of 90% or more, more preferably 93% or more. Moreover, as a realistic upper limit, it is about 99%.
  • the haze value is preferably 2% or less, more preferably 1.5% or less.
  • the total light transmittance and haze value can be measured according to JIS K7361 and JIS K7136.
  • the substrate film has an in-plane retardation Ro of 0 to 5 nm and a thickness direction retardation Rth of ⁇ 10 to 10 nm at a wavelength of 590 nm. Further, Rth is more preferably in the range of ⁇ 5 to 5 nm.
  • Ro and Rth are values defined by the following formulas (III) and (IV).
  • Formula (III) Ro (nx ⁇ ny) ⁇ d
  • Rth ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ d (Where nx is the refractive index in the slow axis direction in the base film surface, ny is the refractive index in the direction perpendicular to the slow axis in the base film surface, and nz is the refractive index in the thickness direction of the base film) , D represents the thickness (nm) of the base film, respectively).
  • the retardation can be obtained at a wavelength of 590 nm in an environment of 23 ° C. and 55% RH (relative humidity) using, for example, KOBRA-21ADH (manufactured by Oji Scientific Instruments).
  • a substrate film controlled to the above-mentioned retardation because it is easy to obtain the objective effect of the present invention in a more severe durability test and is excellent in visibility when used for an inner touch panel or the like.
  • Retardation can be adjusted by the kind and addition amount of a plasticizer mentioned above, the film thickness of a base film, stretching conditions, and the like.
  • a production method such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, a hot press method, or the like can be used.
  • Organic solvents useful for forming a resin solution (dope composition) when a base film is produced by a solution casting film forming method simultaneously dissolve resins such as acrylic resin and cellulose ester resin, and other additives. If it does, it can be used without limitation.
  • a chlorinated organic solvent methylene chloride
  • a non-chlorinated organic solvent methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butan
  • methylene chloride, methyl acetate, ethyl acetate may be used preferably acetone.
  • the solvent is preferably a dope composition in which a total of 15 to 45% by mass of a resin such as an acrylic resin or a cellulose ester resin and other additives are dissolved.
  • solution casting film forming method a step of preparing a dope by dissolving a resin and an additive in a solvent, a step of casting the dope on a belt-shaped or drum-shaped metal support, and drying the cast dope as a web It is performed by the process of carrying out, the process of peeling from a metal support body, the process of extending
  • a stainless steel belt or a drum whose surface is plated with a casting is preferably used.
  • the cast width can be 1 ⁇ 4m.
  • the surface temperature of the metal support in the casting step is set to ⁇ 50 ° C. to below the temperature at which the solvent boils and does not foam. A higher temperature is preferred because the web can be dried faster, but if it is too high, the web may foam or the flatness may deteriorate.
  • a preferable support temperature is appropriately determined at 0 to 100 ° C., and more preferably 5 to 30 ° C.
  • the method for controlling the temperature of the metal support is not particularly limited, and there are a method of blowing warm air or cold air, and a method of contacting hot water with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
  • the amount of residual solvent when peeling the web from the metal support is preferably 10 to 150% by mass, more preferably 20 to 40% by mass or 60 to It is 130% by mass, particularly preferably 20 to 30% by mass or 70 to 120% by mass.
  • the amount of residual solvent is defined by the following formula.
  • Residual solvent amount (% by mass) ⁇ (MN) / N ⁇ ⁇ 100
  • M is the mass of a sample collected during or after the production of the web or film
  • N is the mass after heating M at 115 ° C. for 1 hour.
  • the web is peeled from the metal support, and further dried, and the residual solvent amount is preferably 1% by mass or less, more preferably 0.1% by mass or less, Particularly preferred is 0 to 0.01% by mass or less.
  • a roll drying method (a method in which webs are alternately passed through a plurality of rolls arranged above and below) and a method in which the web is dried while being conveyed by a tenter method are employed.
  • the film can be sequentially or simultaneously stretched in the longitudinal direction (MD direction) and the lateral direction (TD direction).
  • the draw ratios in the biaxial directions perpendicular to each other are preferably in the range of 1.0 to 2.0 times in the MD direction and 1.05 to 2.0 times in the TD direction, respectively. It is preferably performed in the range of 1.0 to 1.5 times and 1.05 to 2.0 times in the TD direction.
  • a method in which peripheral speed differences are applied to a plurality of rolls and a roll peripheral speed difference is used to stretch in the MD direction both ends of the web are fixed with clips and pins, and the distance between the clips and pins is increased in the traveling direction.
  • a tenter it may be a pin tenter or a clip tenter.
  • the film transport tension in the film forming process such as a tenter depends on the temperature, but is preferably 120 to 200 N / m, and more preferably 140 to 200 N / m. 140 to 160 N / m is most preferable.
  • the stretching temperature is (Tg-30) to (Tg + 100) ° C., more preferably (Tg-20) to (Tg + 80) ° C., and more preferably (Tg-5), where Tg is the glass transition temperature of the base film. ⁇ (Tg + 20) ° C.
  • the Tg of the base film can be controlled by the type of material constituting the film and the ratio of the constituting materials.
  • the Tg when the film is dried is preferably 110 ° C. or higher, more preferably 120 ° C. or higher. Especially preferably, it is 150 degreeC or more.
  • the glass transition temperature is preferably 190 ° C. or lower, more preferably 170 ° C. or lower.
  • the Tg of the film can be determined by the method described in JIS K7121.
  • the surface is preferably roughened.
  • the slipperiness is improved and the surface workability, particularly the adhesion of the antiglare layer is improved.
  • the base film may be formed by a melt casting film forming method.
  • the melt casting film forming method means that a composition containing an additive such as a resin and a plasticizer is heated and melted to a temperature showing fluidity, and then cast.
  • the melt extrusion method is preferable from the viewpoint of mechanical strength and surface accuracy. It is preferable that a plurality of raw materials used for melt extrusion are usually kneaded in advance and pelletized.
  • Pelletization may be performed by a known method. For example, dry cellulose ester, plasticizer, and other additives are fed to an extruder with a feeder and kneaded using a single-screw or twin-screw extruder, and formed into a strand from a die. It can be done by extrusion, water cooling or air cooling and cutting.
  • Additives may be mixed before being supplied to the extruder, or may be supplied by individual feeders.
  • a small amount of additives such as particles and antioxidants are preferably mixed in advance in order to mix uniformly.
  • the extruder is preferably processed at a temperature as low as possible so that it can be pelletized so that the shearing force is suppressed and the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • a temperature as low as possible so that it can be pelletized so that the shearing force is suppressed and the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • the resin does not deteriorate (molecular weight reduction, coloring, gel formation, etc.).
  • a twin screw extruder it is preferable to rotate in the same direction using a deep groove type screw. From the uniformity of kneading, the meshing type is preferable.
  • Film formation is performed using the pellets obtained as described above.
  • the raw material powder can be directly fed to the extruder by a feeder without being pelletized to form a film as it is.
  • the pellets are melted at a temperature of about 200 to 300 ° C, filtered through a leaf disk filter, etc. to remove foreign matter, and then formed into a film from the T die. Then, the film is nipped with a cooling roll and an elastic touch roll and solidified on the cooling roll to form a film.
  • the extrusion flow rate is preferably adjusted stably by introducing a gear pump or the like.
  • a stainless fiber sintered filter is preferably used as a filter used for removing foreign substances.
  • the stainless steel fiber sintered filter is a united stainless steel fiber body that is intricately intertwined and compressed, and the contact points are sintered and integrated. The density of the fiber is changed depending on the thickness of the fiber and the amount of compression, and the filtration accuracy is improved. Can be adjusted.
  • Additives such as plasticizers and particles may be mixed with the resin in advance, or may be kneaded in the middle of the extruder. In order to add uniformly, it is preferable to use a mixing apparatus such as a static mixer.
  • the film temperature on the touch roll side when the film is nipped between the cooling roll and the elastic touch roll is preferably set to Tg or more (Tg + 110 ° C.) or less of the film.
  • a well-known roll can be used for the roll which has the elastic body surface used for such a purpose.
  • the elastic touch roll is also called a pinching rotator.
  • As the elastic touch roll a commercially available one can be used.
  • the film obtained as described above is stretched by the stretching operation after passing through the step of contacting the cooling roll.
  • the stretching method a known roll stretching machine or tenter can be preferably used.
  • the stretching temperature is usually preferably in the temperature range of Tg to (Tg + 60) ° C. of the resin constituting the film.
  • the end Before winding, the end may be slit and cut to the product width, and knurled (embossed) may be applied to both ends to prevent sticking or scratching during winding.
  • the knurling method can be performed by heating or pressurizing using a metal ring having an uneven pattern on the side surface. Note that the gripping portions of the clips at both ends of the film are usually cut out and reused because the film is deformed and cannot be used as a product.
  • the film thickness of the substrate film in the present embodiment is not particularly limited, but is preferably 10 to 250 ⁇ m, more preferably 10 to 100 ⁇ m, and still more preferably 20 to 60 ⁇ m. By setting it as the said range, it is excellent in the handleability of a base film.
  • the width of the substrate film according to the present invention is preferably 1 to 4 m, more preferably 1.4 to 4 m, and still more preferably 1.6 to 3 m. If it exceeds 4 m, conveyance becomes difficult.
  • the length of the base film is preferably 1000 to 10,000 m, more preferably 3000 to 8000 m. By setting it as the range of the said length, it is excellent in the processability in application
  • the arithmetic average roughness Ra of the base film is preferably 2.0 to 4.0 nm, more preferably 2.5 to 3.5 nm.
  • the arithmetic average roughness Ra can be measured according to JIS B0601: 1994.
  • the optical film of the present invention can be provided with other layers such as an antireflection layer and a transparent conductive thin layer.
  • the optical film according to the present invention can be used as an antireflection film having an external light antireflection function by coating an antireflection layer on a hard coat layer or a functional upper layer.
  • the antireflection layer is preferably laminated in consideration of the refractive index, the film thickness, the number of layers, the layer order, and the like so that the reflectance is reduced by optical interference.
  • the antireflection layer is composed of a low refractive index layer having a refractive index lower than that of the protective film as a support, or a combination of a high refractive index layer and a low refractive index layer having a higher refractive index than that of the protective film as a support. It is preferable.
  • an antireflection layer composed of three or more refractive index layers, and three layers having different refractive indexes from the support side are divided into medium refractive index layers (high refractive index layers having a higher refractive index than the support).
  • medium refractive index layers high refractive index layers having a higher refractive index than the support.
  • an antireflection layer having a layer structure of four or more layers in which two or more high refractive index layers and two or more low refractive index layers are alternately laminated is also preferably used.
  • the layer structure of the antireflection film the following structure is conceivable, but is not limited thereto.
  • the low refractive index layer preferably contains silica-based fine particles, and the refractive index is preferably in the range of 1.30 to 1.45 as measured at 23 ° C. and wavelength of 550 nm.
  • the film thickness of the low refractive index layer is preferably 5 nm to 0.5 ⁇ m, more preferably 10 nm to 0.3 ⁇ m, and most preferably 30 nm to 0.2 ⁇ m.
  • the composition for forming a low refractive index layer preferably contains at least one kind of particles having an outer shell layer and porous or hollow inside as silica-based fine particles.
  • particles (hollow silica-based fine particles) that have an outer shell layer and are porous or hollow inside are preferable.
  • composition for forming a low refractive index layer may contain an organosilicon compound represented by the following general formula (OSi-1), a hydrolyzate thereof, or a polycondensate thereof.
  • OSi-1 organosilicon compound represented by the following general formula (OSi-1)
  • hydrolyzate thereof a hydrolyzate thereof
  • polycondensate thereof a polycondensate thereof.
  • R represents an alkyl group having 1 to 4 carbon atoms. Specifically, tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane and the like are preferably used.
  • a solvent and if necessary, a silane coupling agent, a curing agent, a surfactant and the like may be added.
  • it may contain a thermosetting and / or photocurable compound mainly containing a fluorine-containing compound containing a fluorine atom in a range of 35 to 80% by mass and containing a crosslinkable or polymerizable functional group.
  • a fluorine-containing polymer or a fluorine-containing sol-gel compound is a fluorine-containing sol-gel compound.
  • fluorine-containing polymer examples include a hydrolyzed product and a dehydrated condensate of a perfluoroalkyl group-containing silane compound (for example, (heptadecafluoro-1,1,2,2-tetrahydrodecyl) triethoxysilane), as well as a fluorine-containing monomer.
  • fluorine-containing copolymers having units and cross-linking reactive units as constituent units.
  • the refractive index of the high refractive index layer is preferably adjusted to a range of 1.4 to 2.2 as measured at 23 ° C. and a wavelength of 550 nm.
  • the thickness of the high refractive index layer is preferably 5 nm to 1 ⁇ m, more preferably 10 nm to 0.2 ⁇ m, and most preferably 30 nm to 0.1 ⁇ m.
  • the refractive index can be adjusted by adding metal oxide fine particles and the like.
  • the metal oxide fine particles to be used preferably have a refractive index of 1.80 to 2.60, more preferably 1.85 to 2.50.
  • the kind of metal oxide fine particles is not particularly limited, and Ti, Zr, Sn, Sb, Cu, Fe, Mn, Pb, Cd, As, Cr, Hg, Zn, Al, Mg, Si, P and S
  • a metal oxide having at least one element selected from the group consisting of Al, In, Sn, Sb, Nb, a halogen element, Ta and the like is doped with a trace amount of atoms. May be. A mixture of these may also be used.
  • at least one metal oxide fine particle selected from zirconium oxide, antimony oxide, tin oxide, zinc oxide, ITO, antimony-doped tin oxide (ATO), and zinc antimonate is used as a main component. preferable. In particular, it is preferable to contain zinc antimonate particles.
  • the average particle diameter of the primary particles of these metal oxide fine particles is in the range of 10 to 200 nm, particularly preferably 10 to 150 nm.
  • the average particle diameter of the metal oxide fine particles can be measured from an electron micrograph taken with a scanning electron microscope (SEM) or the like. You may measure by the particle size distribution meter etc. which utilize a dynamic light scattering method, a static light scattering method, etc. If the particle size is too small, aggregation tends to occur and the dispersibility deteriorates. If the particle size is too large, the haze is remarkably increased.
  • the shape of the metal oxide fine particles is preferably a rice grain shape, a spherical shape, a cubic shape, a spindle shape, a needle shape, or an indefinite shape.
  • the metal oxide fine particles may be surface-treated with an organic compound.
  • an organic compound By modifying the surface of the metal oxide fine particles with an organic compound, the dispersion stability in an organic solvent is improved, the dispersion particle size can be easily controlled, and aggregation and sedimentation over time can be suppressed. . Therefore, the surface modification amount with a preferable organic compound is 0.1% to 5% by mass, more preferably 0.5% to 3% by mass with respect to the metal oxide fine particles.
  • the organic compound used for the surface treatment include polyols, alkanolamines, stearic acid, silane coupling agents, and titanate coupling agents. Of these, silane coupling agents are preferred. Two or more kinds of surface treatments may be combined.
  • the high refractive index layer may contain a ⁇ -conjugated conductive polymer.
  • the ⁇ -conjugated conductive polymer can be used as long as it is an organic polymer having a main chain composed of a ⁇ -conjugated system. Examples thereof include polythiophenes, polypyrroles, polyanilines, polyphenylenes, polyacetylenes, polyphenylene vinylenes, polyacenes, polythiophene vinylenes, and copolymers thereof. From the viewpoint of ease of polymerization and stability, polythiophenes, polyanilines, and polyacetylenes are preferable.
  • the ⁇ -conjugated conductive polymer can provide sufficient conductivity and solubility in a binder resin even if it is not substituted, but in order to further improve conductivity and solubility, an alkyl group, a carboxy group, a sulfo group, an alkoxy group.
  • a functional group such as a group, a hydroxy group, or a cyano group may be introduced.
  • you may contain an ionic compound.
  • the ionic compound examples include imidazolium-based, pyridium-based, alicyclic amine-based, aliphatic amine-based, aliphatic phosphonium-based cations and inorganic ion-based compounds such as BF 4 ⁇ and PF 6 ⁇ , CF 3 SO 2 ⁇ , and the like. , (CF 3 SO 2 ) 2 N ⁇ , CF 3 CO 2 —, etc.
  • the ratio of the polymer to the binder is preferably 10 to 400 parts by mass with respect to 100 parts by mass of the polymer, and particularly preferably 100 to 200 parts by mass of the binder with respect to 100 parts by mass of the polymer.
  • a transparent conductive thin layer may be formed on the hard coat layer or the functional layer.
  • the transparent conductive thin layer to be provided generally known transparent conductive materials can be used.
  • a transparent conductive material such as indium oxide, tin oxide, ITO, gold, silver, or palladium can be used. These can be formed as a thin film on the hard coat layer by vacuum deposition, sputtering, ion plating, solution coating, or the like.
  • a transparent conductive material that is excellent in transparency and conductivity, and that has a main component of any of indium oxide, tin oxide, and ITO obtained at a relatively low cost can be suitably used.
  • the thickness of the transparent conductive thin film varies depending on the material to be applied, it cannot be said unconditionally.
  • the surface resistivity is 1000 ⁇ or less, preferably 500 ⁇ or less. A range of 20 nm or more and 80 nm or less, preferably 70 nm or less is preferable. In such a thin film, visible light interference fringes due to uneven thickness of the transparent conductive thin layer are unlikely to occur.
  • the optical film of this invention is preferable at the point by which the performance excellent in visibility (clearness) is exhibited by using it for an image display apparatus.
  • an image display device a reflection type, a transmission type, a transflective type liquid crystal display device, a liquid crystal display device of various driving methods such as a TN type, an STN type, an OCB type, a VA type, an IPS type, and an ECB type, an organic EL display Examples thereof include a device and a plasma display.
  • the optical film of the present invention is used for a touch panel member of a liquid crystal display device including a touch panel, it is preferable in terms of excellent visibility and durability against pen input (scratches due to sliding, etc.).
  • FIG. 1 An example when used for a touch panel is shown in FIG.
  • the transparent conductive thin film 12 is formed on the transparent optical film 11 of the present invention, and this is opposed to the glass substrate 13 on which the transparent conductive thin film 15 is formed with a certain interval so that the transparent conductive thin films face each other.
  • the resistive film type touch panel 10 can be configured. Electrodes (not shown) are arranged at the ends of the optical film 11 and the glass substrate 13. When the user presses down the optical film 11 with the transparent conductive thin film 12 with a finger or a pen, the transparent conductive thin film 12 comes into contact with the transparent conductive thin film 15 on the glass substrate 13. The pressed position is detected by electrically detecting this contact through the electrode at the end.
  • a liquid crystal display device with a touch panel can be configured by mounting the touch panel 10 of FIG. 2 on a color liquid crystal display panel 20.
  • optical film image display device
  • liquid crystal display device The technical features of the optical film, image display device and liquid crystal display device are summarized below.
  • An optical film according to one aspect of the present invention is an optical film having a hard coat layer on one surface of a base film and a functional layer on the other surface, the functional layer having a period in the length direction. It has no irregular protrusion shape and is substantially free of fine particles or non-reactive polymer.
  • the functional layer is composed only of highly compatible resin components that do not contain fine particles, etc., there is no deterioration in the durability test, and it is excellent even after the durability test assuming outdoor use. It is preferable at the point which can provide the optical film which has flexibility.
  • the optical film described above has almost no haze due to internal scattering, it provides an image display device that has excellent visibility when used in an image display device and does not cause eye fatigue even when viewed for a long time. It is preferable at the point which can do.
  • the surface film of a liquid crystal display device including a touch panel is preferable in that it can provide an optical film excellent in pen sliding resistance assuming an operating environment in which a pen, a finger, or the like is pushed when inputting information.
  • the arithmetic average roughness Ra of the protrusion shape of the functional layer is preferably 10 to 130 nm. According to this configuration, in a more severe durability test, the object and effects of the present invention can be suitably obtained, and this is preferable in terms of excellent adhesion.
  • the functional layer contains at least an actinic radiation curable resin, and the viscosity of the actinic radiation curable resin is in the range of 20 to 2000 mPa ⁇ s. According to this structure, it is preferable at the point which can obtain the optical film which was especially excellent in coexistence of blocking resistance and flexibility.
  • the arithmetic average roughness Ra of the hard coat layer is preferably less than 2 nm. According to this configuration, a very smooth surface is obtained, which is preferable in that visibility when used in an image display device can be suitably obtained.
  • the in-plane retardation Ro is 0 to 5 nm and the retardation Rth in the thickness direction is ⁇ 10 to 10 nm at a wavelength of 590 nm of the base film.
  • the base film is preferably a cellulose ester film. According to this configuration, it is preferable from the viewpoint of ease of obtaining the protrusion shape of the present invention, manufacturability, and cost.
  • An image display device according to an aspect of the present invention includes any one of the above optical films in its configuration. This configuration is preferable in that it can provide an image display device that does not cause eye fatigue even when viewed for a long time.
  • An image display device according to an aspect of the present invention is an image display device including a touch panel, and the structure of the touch panel includes any one of the optical films described above. This configuration is preferable in that it can provide an image display device including a touch panel that is excellent in scratching and peeling of the surface due to pen sliding during information input.
  • Example 1 ⁇ Preparation of base film 1> (Preparation of silicon dioxide dispersion) Aerosil R812 (Nippon Aerosil Co., Ltd., average primary particle diameter of 7 nm) 10 parts by mass Ethanol 90 parts by mass The above was stirred and mixed with a dissolver for 30 minutes, and then dispersed with Manton Gorin. 88 parts by mass of methylene chloride was added to the silicon dioxide dispersion while stirring, and the mixture was stirred and mixed with a dissolver for 30 minutes to prepare a silicon dioxide dispersion dilution. The mixture was filtered with a fine particle dispersion dilution filter (Advantech Toyo Co., Ltd .: polypropylene wind cartridge filter TCW-PPS-1N).
  • a fine particle dispersion dilution filter Advancedtech Toyo Co., Ltd .: polypropylene wind cartridge filter TCW-PPS-1N).
  • Dope composition 1 90 parts by mass of cellulose triacetate (cellulose triacetate synthesized from linter cotton, acetyl group substitution degree 2.88, Mn: 140000) Polyester plasticizer (B-5) 10 parts by weight Tinuvin 928 (manufactured by BASF Japan Ltd.) 2.5 parts by weight Silicon dioxide dispersion diluent 4 parts by weight Methylene chloride 432 parts by weight Ethanol 38 parts by weight The solution was completely dissolved while being heated and stirred, and Azumi Filter Paper No. No. 24 was used for filtration to prepare a dope composition 1.
  • the belt was cast evenly on a stainless steel band support using a belt casting apparatus.
  • the solvent was evaporated until the residual solvent amount reached 100%, and the web was peeled from the stainless steel band support.
  • Solvent in the web of cellulose ester film is evaporated at 35 ° C, slit to 1.65m width, and dried at 160 ° C while stretching with a tenter at 1.15 times in the TD direction and 1.01 times in the MD direction. It was.
  • the residual solvent amount at the start of drying was 20%. Then, after being dried for 15 minutes while being transported in a drying device at 120 ° C.
  • the base film 1 was obtained.
  • the residual solvent amount of the base film was 0.2%, the film thickness was 40 ⁇ m, and the winding number was 6000 m.
  • the following functional layer composition 1 filtered through a polypropylene filter having a pore size of 0.2 ⁇ m is applied using a vacuum extrusion coater, and dried at a constant rate. After drying at a section temperature of 105 ° C. and a reduced rate drying section temperature of 105 ° C., the irradiance of the irradiated part is 100 mW / cm 2 using an ultraviolet lamp while purging with nitrogen so that the atmosphere has an oxygen concentration of 1.0% by volume or less.
  • the coating layer was cured with an irradiation dose of 0.3 J / cm 2 to form a functional layer 1 having a dry film thickness of 6.5 ⁇ m.
  • the film on which the functional layer 1 was formed was inverted with a turn bar, and the following hard coat layer composition was filtered through a polypropylene filter having a pore diameter of 0.2 ⁇ m on the surface opposite to the surface on which the functional layer 1 was provided.
  • the product is coated on a cellulose triacetate film using a vacuum extrusion coater, dried at a constant rate drying zone temperature of 115 ° C.
  • FIG. 1 As a result of observing the surface of the functional layer 1 of the optical film 1 with an optical interference type surface roughness meter (New View 5030, manufactured by Zygo), irregular projection shapes irregularly in the length direction and width as shown in FIG. It turns out that it is arranged in the direction.
  • optical interference type surface roughness meter New View 5030, manufactured by Zygo
  • Radical polymerizable fluororesin (A): Cefal coat CF-803 (hydroxyl group (hydroxyl group) value 60, Mn: 15,000; manufactured by Central Glass Co., Ltd.)
  • One-end radical-polymerizable polysiloxane (B): Silaplane FM-0721 (Mn: 5,000; manufactured by Chisso Corporation)
  • Radical polymerization initiator Perbutyl O (t-butylperoxy-2-ethylhexanoate; manufactured by NOF Corporation)
  • Curing agent Sumidur N3200 (biuret type prepolymer of hexamethylene diisocyanate; manufactured by Sumika Bayer Urethane Co., Ltd.)
  • Reactive group-containing resin 100 parts by mass of dipentaerythritol hexaacrylate (NK ester A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.) (Photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (leveling agent) Fluorine-siloxane graft polymer (35% by mass) 1.5 parts by mass (solvent) Propylene glycol monomethyl ether 10 parts by weight Methyl acetate 45 parts by weight Methyl ethyl ketone 45 parts by weight
  • optical film 2 was produced in the same manner except that the functional composition 1 was changed to the following functional composition 2 and the decreasing rate drying zone temperature was changed to 95 ° C.
  • Reactive group-containing resin 80 parts by mass of trimethylolpropane triacrylate (Light acrylate TMP-A, manufactured by Kyoeisha Chemical Co., Ltd.) 20 parts by mass of 4-hydroxybutyl acrylate (4-HBA, manufactured by Osaka Organic Chemical Industry Co., Ltd.) (Photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (leveling agent) Polyether-modified silicone (trade name: KF-352, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.5 parts by mass (solvent) Propylene glycol monomethyl ether 10 parts by weight Methyl acetate 45 parts by weight Methyl ethyl ketone 45 parts by weight
  • optical film 3 was produced in the same manner except that the functional layer composition 1 was changed to the following functional layer composition 4 and the decreasing rate drying zone temperature was changed to 100 ° C.
  • Reactive group-containing resin 100 parts by mass of ethoxylated pentaerythritol tetraacrylate (NK ester ATM-4E, manufactured by Shin-Nakamura Chemical Co., Ltd.) (Photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (leveling agent) Polyether-modified silicone (trade name: KF-352, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.5 parts by mass (solvent) Propylene glycol monomethyl ether 10 parts by weight Methyl acetate 45 parts by weight Methyl ethyl ketone 45 parts by weight
  • optical film 4 was produced in the same manner except that the functional layer composition 1 was changed to the following functional layer composition 4 and the decreasing rate drying zone temperature was changed to 130 ° C.
  • Reactive group-containing resin 100 parts by mass of dipentaerythritol penta / hexaacrylate (NK ester A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.) (Photopolymerization initiator) Irgacure 184 (manufactured by BASF Japan) 5 parts by mass (leveling agent) Polyether-modified silicone (trade name: KF-352, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.5 parts by mass (solvent) Propylene glycol monomethyl ether 10 parts by weight Methyl acetate 45 parts by weight Methyl ethyl ketone 45 parts by weight
  • optical film 5 was produced in the same manner except that the functional layer composition 1 was changed to the following functional layer composition 5 and the decreasing rate drying zone temperature was changed to 120 ° C.
  • optical film 6 was produced in the same manner except that the functional layer composition 1 was changed to the following functional layer composition 6 and the decreasing rate drying zone temperature was changed to 95 ° C.
  • optical film 7 was produced in the same manner except that the functional layer composition 1 was changed to the following functional layer composition 7 and the decreasing rate drying zone temperature was changed to 135 ° C.
  • ACA cyclomer P (ACA) Z320
  • MMA polymethyl methacrylate
  • the functional layer composition 1 was changed to the functional layer composition 10 prepared in the same manner as in Example 5 of JP-A-2007-182519, and the drying temperature was further changed to JP-A-2007-182519.
  • the optical film 10 was produced in the same manner except that the temperature was changed to 80 ° C., which was the same as Example 5 of the publication.
  • [Functional layer composition 10] (Preparation of unsaturated double bond-containing acrylic copolymer) A mixture consisting of 187.2 g of isobornyl methacrylate, 2.8 g of methyl methacrylate and 10.0 g of methacrylic acid was mixed. This mixture was mixed with 360 g of propylene glycol monomethyl ether heated to 110 ° C. under a nitrogen atmosphere in a 1000 ml reaction vessel equipped with a stirring blade, a nitrogen introducing tube, a cooling tube and a dropping funnel. At the same time as an 80.0 g solution of propylene glycol monomethyl ether containing 2.0 g of ate, the solution was dropped at a constant rate over 3 hours, and then reacted at 110 ° C. for 1 hour.
  • the illuminance of the irradiated part is 100 mW / cm 2 and the irradiation amount is 0.3 J / cm 2 using an ultraviolet lamp.
  • the coating layer was cured to form a functional layer 11 having a dry film thickness of 6.5 ⁇ m.
  • the film on which the functional layer is formed is inverted by a turn bar, and the hard coat layer composition prepared with the optical film 1 is made of polypropylene having a pore diameter of 0.2 ⁇ m on the surface opposite to the surface on which the functional layer 11 is provided.
  • the material filtered through a filter is applied onto the base film 1 using a vacuum extrusion coater, dried at a constant rate drying zone temperature of 115 ° C. and a reduced rate drying zone temperature of 115 ° C., and then irradiated with an ultraviolet lamp.
  • the irradiation amount was 0.15 J / cm 2
  • the coating layer was cured to form a hard coat layer having a dry film thickness of 5 ⁇ m.
  • FIG. As a result of observing the surface of the functional layer 11 of the optical film 11 with an optical interference type surface roughness meter (New View 5030, manufactured by Zygo), protrusion shapes having a period in the length direction were arranged.
  • a fluorinated silica fine particle dispersion was prepared in the same manner as in Production Example 1 of JP 2010-241937.
  • the prepared silica fine particle dispersion and the reactive group-containing resin were stirred and mixed to prepare a functional layer composition 12.
  • the optical film 12 was obtained in the same manner as the production of the optical film 1 except that the drying temperature was changed to 70 ° C. as in Example 3 of JP2010-241937. .
  • [Functional layer composition 12] (Preparation of fluorinated silica fine particle dispersion) Silica fine particles SP-03F (manufactured by Fuso Chemical Industry Co., Ltd., particle size 0.2-0.3 ⁇ m) 3.00 g and KBM7103 (manufactured by Shin-Etsu Chemical Co., Ltd., fluoroalkylalkoxysilane) 0.15 g, MIBK 26.85 g Were mixed. This mixed component and zirconia beads having a particle diameter of 0.1 mm are mixed and dispersed for 3 hours, after which the zirconia beads are removed, and the dispersion is further heated at 50 ° C. for 1 hour to obtain a fluorine-treated silica fine particle dispersion. Got.
  • Optical film a. Measurement of Arithmetic Average Roughness Ra
  • the functional layers and hard coat layers of the optical films 1 to 12 prepared above were measured 10 times using an optical interference type surface roughness meter (RST / PLUS, manufactured by WYKO), The arithmetic average roughness Ra of each functional layer and hard coat layer was determined from the average of the measurement results.
  • the arithmetic average roughness Ra of the hard coat layers of the optical films 1 to 12 was all 1.5 nm.
  • the results of arithmetic average roughness Ra of each functional layer are shown in Table 1.
  • the optical films 1 to 13 produced above are cut out in a size of 10 cm ⁇ 10 cm, and are cycled for 500 cycles in a cycle thermo (alternatively left at ⁇ 40 ° C. for 30 minutes and then at 85 ° C. for 30 minutes) assuming outdoor use. After the charging, it was stored in a constant temperature bath at 85 ° C. and a relative humidity of 90% for 550 hours, and further irradiated with light for 165 hours with a light resistance tester (eye super UV tester, manufactured by Iwasaki Electric Co., Ltd.). Next, after each of the optical films 1 to 12 after the durability test was conditioned for 14 hours in an atmosphere of 23 ° C.
  • a cylinder using a type 1 test apparatus in accordance with JIS K5600-5-1 The flexibility (numerical diameter of the mandrel) was evaluated by the type mandrel method. It shows that it is excellent in the flexibility, so that the numerical value of the diameter of a mandrel is low.
  • the cylindrical mandrel has a diameter of only 2 mm, so a 1 mm diameter was prototyped.
  • ⁇ The diameter of a cylindrical mandrel with a blocking resistance of ⁇ and a flexible evaluation is 2 mm or less.
  • ⁇ The diameter of a cylindrical mandrel with a blocking resistance of ⁇ and a flexible evaluation is 2 mm or less. Or, blocking resistance.
  • the diameter of the cylindrical mandrel evaluated for flexibility and the flexibility is 3 mm or more and 6 mm or less ⁇ : The blocking resistance is ⁇ or less, or the diameter of the cylindrical mandrel for flexibility evaluation is 8 mm or more
  • the functional layer is irregular in the length direction (has a period. No)
  • An optical film excellent in both blocking resistance and flexibility could be obtained by having a projection shape and substantially not containing fine particles or non-reactive polymer.
  • the functional layer contains an actinic radiation curable resin containing a reactive group, and the actinic radiation curable resin has a viscosity in the range of 20 to 3000 mPa ⁇ s, thereby preventing blocking and flexibility. It was possible to obtain an optical film particularly excellent in both of the above.
  • Example 2 Optical films 13 to 17 were produced in the same manner as in the production of the optical film 1 of Example 1, except that the decreasing rate drying zone temperature of the functional layer was changed as described in Table 2. Next, with respect to the optical film 1 and the optical films 13 to 17 produced in Example 1, the storage period of the blocking resistance evaluation was changed to 30 days, and the adhesion evaluation was further performed in the same manner as in Example 1. And evaluated. The obtained results are shown in Table 2.
  • Adhesion evaluation after endurance weather resistance test
  • the optical film 1 and the optical films 13 to 17 were cut out in a size of 10 cm ⁇ 10 cm, stored for 100 hours in an environment of ozone 10 ppm, 30 ° C., 60% RH, assuming outdoor use, and cycle thermo ( ⁇ 500 cycles were carried out at 40 ° C. for 45 minutes and then 110 ° C. for 45 minutes alternately, and further irradiated with light for 200 hours with a light resistance tester (I Super UV Tester, manufactured by Iwasaki Electric Co., Ltd.).
  • the arithmetic average roughness Ra of the protrusion shape of the functional layer is set to 10 to 130 nm, so that the blocking resistance is flexible even after a more severe durability test. It can be seen that it exhibits particularly excellent performance in coexistence of properties. Furthermore, it exhibits excellent performance in adhesion after the weather resistance test.
  • Example 3 In the preparation of the dope composition 1 for the base film 1 of Example 1, the amount of the polyester plasticizer (B-5) added was changed to 5 parts by mass, and 13 parts by mass of the acrylic polymer 1 synthesized below was further added. Dope composition 2 was prepared in the same manner except that it was added. Subsequently, in the production of the base film 1, the base films 2 to 5 were produced in the same manner except that the stretching conditions in the TD direction by the tenter were changed as described in Table 3. The prepared base films 2 to 5 were provided with a hard coat layer and a functional layer in the same manner as the production of the optical film 17 of Example 2, and optical films 18 to 21 were produced.
  • a conductive thin film was formed on the produced optical films 18 to 21 and the optical film 1 by the following method to produce the conductive optical films 18 to 21 and the conductive optical film 1.
  • a conductive thin film 33 of indium tin oxide (ITO) having a surface resistivity of about 400 ⁇ is provided on both surfaces of the optical films 18 to 21 and the functional layer 31 and the hard coat layer 32 of the optical film 1 using a sputtering method. Conductive optical films 18 to 21 and conductive optical film 1 having the configuration shown in FIG. 6 were produced.
  • ITO indium tin oxide
  • FIG. 7 is a schematic diagram of the inner touch panel P.
  • the dot touch panel 14 is formed in advance on the surface of the two conductive optical films provided with the conductive thin film 33 on the hard coat layer 32 of the conductive optical film, and then the inner touch panel P was made.
  • the produced optical films 18 to 21 and the optical film 1 were evaluated in the same manner as in Example 2. Moreover, the retardation of the base film was measured by the following method. Furthermore, the visibility of the inner touch panel produced using the conductive optical films 18 to 21 and the conductive optical film 1 was evaluated under the following conditions. The obtained results are shown in Table 3.
  • In-plane retardation Ro and thickness direction retardation Rth measurement automatic birefringence meter KOBRA-21ADH (manufactured by Oji Scientific Instruments Co., Ltd.) is used for three-dimensional refraction at a wavelength of 590 nm in an environment of 23 ° C. and 55% RH.
  • the refractive index nx, ny, and nz in the vertical, horizontal, and thickness directions were determined, and Ro and Rth were determined from the following formulas.
  • the obtained inner touch panel was incorporated under the upper surface side polarizing plate of the liquid crystal display device having the configuration of the upper surface side polarizing plate / liquid crystal cell / lower surface side polarizing plate to produce a liquid crystal display device, and in a dark room, The inner touch panel was viewed on a black display screen while changing the front direction and the visual field direction, and the visibility was evaluated according to the following criteria.
  • the optical film of the present invention using a base film in which the in-plane retardation Ro is adjusted to 0 to 5 nm and the retardation in the thickness direction is within a range of ⁇ 10 to 10 nm is flexible and has blocking resistance even after a more severe durability test. It can be seen that it exhibits particularly excellent performance in coexistence of properties. Furthermore, it exhibits excellent performance in adhesion after the weather resistance test.
  • a conductive optical film using the optical film of the present invention comprising a base film in which the in-plane retardation Ro is adjusted to 0 to 5 nm and the thickness direction retardation is adjusted to a range of ⁇ 10 to 10 nm is used for the inner touch panel.
  • Example 4 ⁇ Preparation of conductive optical films 1-12> A transparent conductive thin film of indium tin oxide (ITO) having a surface resistivity of about 400 ⁇ is provided on the hard coat layers of the optical films 1 to 12 by sputtering, and the conductive optical film 1 having the configuration shown in FIG. To 12 were produced.
  • ITO indium tin oxide
  • ⁇ Preparation of resistive touch panel liquid crystal display devices 1 to 13> The conductive hard coat film of a commercially available resistive film type touch panel liquid crystal display device (model name: LCD-USB10XB-T, manufactured by IO Data Equipment Co., Ltd.) is peeled off, and each of the produced conductive optical films 1 to 12 is prepared. As shown in FIG. 6, the functional layer is bonded to the viewing side to produce resistive film type touch panel liquid crystal display devices 1 to 12, and the following items are evaluated. Table 4 shows the results.
  • the resistance film type touch panel liquid crystal display device using the conductive optical film of the present invention was excellent in both visibility and pen sliding resistance.

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Abstract

L'invention porte sur un film optique, qui a d'excellentes propriétés de prévention de blocage et une excellente souplesse ; sur un film optique qui souffre à peine d'un voile provoqué par une dispersion interne ; et sur un dispositif d'affichage d'image qui utilise le film optique et qui a une excellente visibilité, et sur un dispositif d'affichage d'image à cristaux liquides qui comprend un panneau tactile qui a d'excellentes propriétés de glissement de stylo lorsqu'une information est entrée. Il est procuré de façon spécifique un film optique, qui comprend une couche de revêtement dure sur une surface d'une base de film et une couche fonctionnelle sur l'autre surface de la base de film, et qui est caractérisé en ce que la couche fonctionnelle a un motif à saillies irrégulières, qui n'a pas de cycle dans la direction longitudinale, et qui ne contient sensiblement pas de fines particules ou de polymère non-réactif.
PCT/JP2011/006394 2010-11-29 2011-11-16 Film optique, dispositif d'affichage d'image et dispositif d'affichage d'image comprenant un panneau tactile WO2012073437A1 (fr)

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JP2012546678A JP5971121B2 (ja) 2010-11-29 2011-11-16 光学フィルムの製造方法

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JP2010-264710 2010-11-29
JP2010264710 2010-11-29

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WO2012073437A1 true WO2012073437A1 (fr) 2012-06-07

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PCT/JP2011/006394 WO2012073437A1 (fr) 2010-11-29 2011-11-16 Film optique, dispositif d'affichage d'image et dispositif d'affichage d'image comprenant un panneau tactile

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JP (1) JP5971121B2 (fr)
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JP2014038180A (ja) * 2012-08-15 2014-02-27 Konica Minolta Inc 光学フィルム、光学フィルムの製造方法、偏光板及び液晶表示装置
JP2014115473A (ja) * 2012-12-10 2014-06-26 Konica Minolta Inc 光学フィルムのロール体とその製造方法、包装体、偏光板および液晶表示装置
JP2014174745A (ja) * 2013-03-08 2014-09-22 Dainippon Printing Co Ltd タッチパネルセンサ及び入出力装置
WO2014185345A1 (fr) * 2013-05-14 2014-11-20 コニカミノルタ株式会社 Procédé de production de film de revêtement dur
WO2017078247A1 (fr) * 2015-11-02 2017-05-11 동우화인켐 주식회사 Film de capteur tactile
KR20170051188A (ko) * 2015-11-02 2017-05-11 동우 화인켐 주식회사 필름 터치 센서
US20210114924A1 (en) * 2018-07-04 2021-04-22 AGC Inc. Glass plate, glass plate having anti-reflection layer, and method for producing glass plate

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JPH0616851A (ja) * 1991-11-25 1994-01-25 Dainippon Printing Co Ltd 耐擦傷性防眩フィルム、偏光板及びその製造方法
JP2003182252A (ja) * 2001-12-19 2003-07-03 Fuji Photo Film Co Ltd 多色画像形成材料と多色画像形成方法
JP2004151937A (ja) * 2002-10-30 2004-05-27 Kimoto & Co Ltd タッチパネルの製造方法、タッチパネル、及びハードコートフィルム
JP2006106224A (ja) * 2004-10-01 2006-04-20 Daicel Chem Ind Ltd 防眩性膜の製造方法

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JP5015462B2 (ja) * 2006-01-11 2012-08-29 株式会社ダイセル 防眩性フィルム及びその製造方法
JP5033740B2 (ja) * 2007-10-26 2012-09-26 帝人株式会社 透明導電性積層体およびタッチパネル
JP5237745B2 (ja) * 2007-10-26 2013-07-17 日本ビー・ケミカル株式会社 耐候性防眩性コーティング組成物、耐候性防眩フィルムおよびその製造方法

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JPH0616851A (ja) * 1991-11-25 1994-01-25 Dainippon Printing Co Ltd 耐擦傷性防眩フィルム、偏光板及びその製造方法
JP2003182252A (ja) * 2001-12-19 2003-07-03 Fuji Photo Film Co Ltd 多色画像形成材料と多色画像形成方法
JP2004151937A (ja) * 2002-10-30 2004-05-27 Kimoto & Co Ltd タッチパネルの製造方法、タッチパネル、及びハードコートフィルム
JP2006106224A (ja) * 2004-10-01 2006-04-20 Daicel Chem Ind Ltd 防眩性膜の製造方法

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014038180A (ja) * 2012-08-15 2014-02-27 Konica Minolta Inc 光学フィルム、光学フィルムの製造方法、偏光板及び液晶表示装置
JP2014115473A (ja) * 2012-12-10 2014-06-26 Konica Minolta Inc 光学フィルムのロール体とその製造方法、包装体、偏光板および液晶表示装置
JP2014174745A (ja) * 2013-03-08 2014-09-22 Dainippon Printing Co Ltd タッチパネルセンサ及び入出力装置
WO2014185345A1 (fr) * 2013-05-14 2014-11-20 コニカミノルタ株式会社 Procédé de production de film de revêtement dur
WO2017078247A1 (fr) * 2015-11-02 2017-05-11 동우화인켐 주식회사 Film de capteur tactile
KR20170051188A (ko) * 2015-11-02 2017-05-11 동우 화인켐 주식회사 필름 터치 센서
CN108351722A (zh) * 2015-11-02 2018-07-31 东友精细化工有限公司 薄膜触控传感器
KR101966634B1 (ko) * 2015-11-02 2019-04-08 동우 화인켐 주식회사 필름 터치 센서
US10809864B2 (en) 2015-11-02 2020-10-20 Dongwoo Fine-Chem Co., Ltd. Film touch sensor
US20210114924A1 (en) * 2018-07-04 2021-04-22 AGC Inc. Glass plate, glass plate having anti-reflection layer, and method for producing glass plate
US11807572B2 (en) * 2018-07-04 2023-11-07 AGC Inc. Glass plate, glass plate having anti-reflection layer, and method for producing glass plate

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