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WO2012165246A1 - Film optique et procédé de fabrication de celui-ci - Google Patents

Film optique et procédé de fabrication de celui-ci Download PDF

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Publication number
WO2012165246A1
WO2012165246A1 PCT/JP2012/063148 JP2012063148W WO2012165246A1 WO 2012165246 A1 WO2012165246 A1 WO 2012165246A1 JP 2012063148 W JP2012063148 W JP 2012063148W WO 2012165246 A1 WO2012165246 A1 WO 2012165246A1
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WO
WIPO (PCT)
Prior art keywords
optical film
coat layer
hard coat
cellulose
optical
Prior art date
Application number
PCT/JP2012/063148
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English (en)
Japanese (ja)
Inventor
牛田　浩明
光明 川西
林　正樹
大村　雅也
Original Assignee
株式会社ダイセル
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Filing date
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Application filed by 株式会社ダイセル filed Critical 株式会社ダイセル
Publication of WO2012165246A1 publication Critical patent/WO2012165246A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
    • G02B1/105—
    • 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
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission

Definitions

  • the present invention relates to an optical film used in combination with a display device in a display unit of electric / electronic or precision equipment, and a manufacturing method thereof.
  • liquid crystal displays have made remarkable progress as display devices for television (TV) applications or video display applications, and are rapidly spreading.
  • the development of high-speed liquid crystal materials and the improvement of driving methods such as overdrive have overcome the conventional video display that LCDs were not good at, and production technology innovations that responded to larger displays Yes.
  • the surface is usually treated to prevent reflection of external light. It is.
  • One of the techniques is anti-glare treatment.
  • the surface of a liquid crystal display is usually subjected to anti-glare treatment.
  • the anti-glare treatment is a treatment that creates a fine uneven structure on the surface, thereby scattering the reflected light on the surface and blurring the reflected image.
  • an anti-glare treatment is applied to an LCD.
  • a dazzling film is provided.
  • a resistive film type touch panel is an electrical component formed by holding two films or plates having transparent electrodes on opposite sides at regular intervals.
  • the operation method is that after fixing one transparent electrode, press the other transparent electrode with a pen or finger from the viewing side, bend it, and contact and conduct with the fixed transparent electrode. Is detected and a predetermined input is made.
  • a touch panel operation method when an electrode is pressed with a pen or a finger, a rainbow pattern due to interference (a so-called “Newton ring” interference color) is formed around the finger or the pointing jig such as the pen. (Or interference fringes) may appear, reducing the visibility of the screen.
  • the LCD and the touch panel are provided with an optical film (or light scattering film) having a concavo-convex structure on the surface
  • this optical film is usually composed of fine particles such as resin fine particles and silica fine particles, and a binder resin or It is obtained by applying a mixture with a curable resin to a substrate and forming a fine concavo-convex structure on the surface.
  • the concavo-convex structure has anti-glare property and anti-Newton ring property, but disturbs the pixel by acting as a lens when disposed on the viewing side of the display device with respect to the pixel.
  • the direction to reduce the unevenness interval such as a method that makes the unevenness interval less than half the pixel size, etc. Has been studied.
  • Patent Document 1 discloses an antiglare film comprising a transparent film and a hard coat layer formed on the transparent film, wherein (a) the primary particle size is 40 to 40 in the hard coat layer.
  • silica fine particles 200 nm silica fine particles, (b) a silica fine particle having a primary particle size of 1 to 30 nm and a binder, and a silica fine particle aggregated structure, the center line average roughness Ra of the hard coat layer side surface of the antiglare film Disclosed is an antiglare film having a thickness of 0.05 to 0.3 ⁇ m, an uneven period ⁇ a of 40 to 200 ⁇ m, and a haze value of the antiglare film of 0.1 to 3.0%.
  • the content of silica fine particles is described as 0.05 to 30% (particularly 0.2 to 25%) of the film weight.
  • a method for forming an aggregate structure of silica fine particles a method using a flocculant such as alkyl acetoacetate aluminum diisopropylate is described.
  • a hard coat layer having a blend of 1.5 to 9 parts by weight with respect to 100 parts by weight of the hard coat material and having a haze of 1.92 to 2.02% and an uneven period of 46 to 80 ⁇ m is formed. Yes.
  • Patent Document 2 has at least one hard coat layer containing a translucent resin and cohesive metal oxide particles on a transparent support, and has a surface haze value. Is disclosed as an optical film having an internal haze value of 0 to 35% and an Sm value of 50 to 200 ⁇ m.
  • JP 2009-265143 A (claims, paragraph [0028], examples) JP 2007-219485 A (Claims, Examples)
  • an object of the present invention is to provide an optical film having excellent antiglare property or anti-Newton ring property and capable of displaying a clear image without whiteness and a method for producing the same.
  • Another object of the present invention is to provide an optical film capable of suppressing glare and improving blackness, and a method for manufacturing the same, despite being thin, for a high-definition display device having a small pixel size. is there.
  • Still another object of the present invention is to provide an optical film excellent in scratch resistance and mechanical properties and a method for producing the same.
  • Another object of the present invention is to provide an optical film in which bleeding out such as a flocculant is suppressed and a method for producing the same.
  • Another object of the present invention is to provide a method for easily producing an optical film having low reflection and low haze.
  • the present inventors have unexpectedly found that the surface of the hard coat layer formed on the transparent film has irregularities larger than the small pixel size in the high-definition display device.
  • the antiglare property or anti-Newton ring property can be improved, and a clear image can be displayed without whiteness, and the present invention has been completed.
  • the optical film of the present invention is an optical film including a transparent film and a hard coat layer formed on the transparent film, and the surface of the hard coat layer has an average irregularity interval Sm600-1500 ⁇ m and An uneven structure having an arithmetic average roughness Ra of 0.04 to 0.2 ⁇ m is formed.
  • the arithmetic average slope ⁇ a of the uneven structure may be 0.05 to 5 °.
  • the optical film of the present invention may have a haze of about 0.1 to 2%.
  • the optical film of the present invention has a transmission image definition of about 1 to 67% when the optical comb width is 0.125 mm, and a transmission image definition of about 2 to 67% when the optical comb width is 0.25 mm.
  • the transmission image definition of 0.5 mm is about 10 to 85%, the transmission image definition of 1 mm optical comb width is about 50 to 95%, and the transmission image definition of 2 mm optical comb width is 80 to 99%. It may be a degree.
  • the hard coat layer may be formed of a cured product of a curable composition containing a curable resin precursor and cellulose nanofibers.
  • the cellulose nanofiber may have an average fiber diameter of about 10 to 500 nm and an average fiber length of about 20 to 500 ⁇ m.
  • the ratio of the cellulose nanofiber may be about 0.01 to 3 parts by weight with respect to 100 parts by weight of the curable resin precursor.
  • the curable composition may further contain a polymer (for example, a cellulose derivative) that does not have an ethylenically unsaturated bond.
  • the curable composition may further contain hollow silica particles.
  • An optical film formed of a curable composition containing a hard silica layer containing hollow silica particles may have a surface reflectance of 4% or less.
  • the hollow silica particles may be unevenly distributed near the surface of the hard coat layer.
  • the hard coat layer may have a thickness of 30 ⁇ m or less.
  • the hard coat layer may not substantially contain a flocculant, and in particular may not contain a flocculant.
  • the present invention also includes a method for producing the optical film, in which a coating liquid for forming a hard coat layer is applied on a transparent film, dried, and then cured by irradiation with active energy rays.
  • drying may be performed at a temperature of 70 ° C. or lower.
  • the surface of the hard coat layer formed on the transparent film has a concavo-convex structure larger than the small pixel size in the high-definition display device, thus improving antiglare property or anti-Newton ring property.
  • a concavo-convex structure using cellulose nanofibers it is possible to suppress glare and improve the blackness of a high-definition display device having a small pixel size despite being thin.
  • the optical film of the present invention includes a hard coat layer formed on a transparent film.
  • This hard coat layer is characterized in that an uneven structure larger than the size of a small pixel of about 40 to 200 ⁇ m is formed on the surface.
  • this concavo-convex structure to a gentle structure with a low height, it is possible to suppress glare and improve anti-glare and anti-Newton ring properties even though it is a clear film with low haze. it can.
  • the uneven structure on the surface has an average interval Sm of 600 to 1500 ⁇ m, preferably 620 to 1400 ⁇ m, more preferably 650 to 1300 ⁇ m (particularly 700 to 1200 ⁇ m), and has high antiglare properties.
  • Sm 600 to 1500 ⁇ m, preferably 620 to 1400 ⁇ m, more preferably 650 to 1300 ⁇ m (particularly 700 to 1200 ⁇ m), and has high antiglare properties.
  • it may be about 650 to 1100 ⁇ m (particularly 700 to 1000 ⁇ m).
  • Sm by making Sm larger than a small pixel, both antiglare property, anti-Newton ring property and visibility can be achieved. If Sm is too small, glare occurs and the image becomes white and the transparency is lowered. When Sm is too large, antiglare property and anti-Newton ring property are deteriorated.
  • the arithmetic average roughness Ra of the uneven structure is 0.04 to 0.2 ⁇ m, preferably 0.05 to 0.19 ⁇ m, more preferably 0.06 to 0.18 ⁇ m (particularly 0.07 to 0.15 ⁇ m). In order to realize high antiglare and anti-Newton ring properties, it may be about 0.05 to 0.12 ⁇ m (particularly 0.07 to 0.1 ⁇ m).
  • the height of the concavo-convex structure is low and the sharpness of the image can be improved by reducing Ra in this way even though Sm is large. When Ra is too small, antiglare property will fall. If Ra is too large, the sharpness of the image decreases.
  • the arithmetic average inclination ⁇ a of the concavo-convex structure is, for example, about 0.05 to 5 °, preferably about 0.06 to 4 °, more preferably about 0.07 to 3 ° (particularly 0.08 to 2 °).
  • the angle may be about 0.1 to 1.5 ° (particularly 0.5 to 1.0 °).
  • ⁇ a is small and the concavo-convex structure is gentle, an excellent scattering effect can be exhibited despite the large concavo-convex structure, and the antiglare property and the anti-Newton ring property can be improved.
  • ⁇ a is too small, the antiglare property and the anti-Newton ring property are lowered. If ⁇ a is too large, the sharpness of the image decreases.
  • the average interval Sm, the arithmetic average roughness Ra, and the arithmetic average slope ⁇ a of these irregularities can be measured by a method based on JIS B0601.
  • the hard coat layer having the concavo-convex structure formed on the surface is only required to be formed of a transparent and hard material, but from the point that a hard coat layer excellent in optical properties and mechanical properties can be easily produced, You may be formed with the hardened
  • the cured product of the curable composition mechanical properties such as scratch resistance can be improved, and by containing cellulose nanofibers, the concavo-convex structure can be obtained by a simple method without impairing optical properties. Can be formed.
  • the curable resin precursor is a compound having a functional group that reacts with heat or active energy rays (such as ultraviolet rays or electron beams) and is cured or crosslinked with heat or active energy rays.
  • heat or active energy rays such as ultraviolet rays or electron beams
  • various curable compounds capable of forming a resin can be used.
  • the resin precursor include thermosetting compounds or resins [low molecular weight compounds having an epoxy group, a polymerizable group, an isocyanate group, an alkoxysilyl group, a silanol group, etc.
  • photocurable compounds curable with actinic rays such as ultraviolet rays
  • photocurable monomers, ultraviolet curable compounds such as oligomers may be an EB (electron beam) curable compound.
  • a photocurable compound such as a photocurable monomer, an oligomer, or a photocurable resin that may have a low molecular weight may be simply referred to as a “photocurable resin”.
  • the photocurable compound includes, for example, a monomer and an oligomer (or a resin, particularly a low molecular weight resin).
  • the monomer can be classified into, for example, a monofunctional monomer having one polymerizable group and a polyfunctional monomer having at least two polymerizable groups.
  • Examples of the monofunctional monomer include (meth) acrylic monomers such as (meth) acrylic acid esters, vinyl monomers such as vinylpyrrolidone, isobornyl (meth) acrylate, and adamantyl (meth) acrylate. Examples include (meth) acrylate having a bridged cyclic hydrocarbon group.
  • the polyfunctional monomer includes a polyfunctional monomer having about 2 to 8 polymerizable groups.
  • the bifunctional monomer include ethylene glycol di (meth) acrylate, propylene glycol di (meth) ) Acrylate, butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, alkylene glycol di (meth) acrylate such as hexanediol di (meth) acrylate; diethylene glycol di (meth) acrylate, dipropylene glycol di (meth) ) Acrylates, (poly) oxyalkylene glycol di (meth) acrylates such as polyoxytetramethylene glycol di (meth) acrylate; bridge rings such as tricyclodecane dimethanol di (meth) acrylate and adamantane di (meth) acrylate And di (meth) acrylate having a hydrocarbon group.
  • tri- to 8-functional monomer examples include glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth). ) Acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.
  • oligomers or resins examples include (meth) acrylates of bisphenol A-alkylene oxide adducts, epoxy (meth) acrylates (bisphenol A type epoxy (meth) acrylates, novolac type epoxy (meth) acrylates, etc.), polyester (meth) acrylates ( For example, aliphatic polyester type (meth) acrylate, aromatic polyester type (meth) acrylate, etc.), urethane (meth) acrylate (polyester type urethane (meth) acrylate, polyether type urethane (meth) acrylate etc.), silicone (meta ) Acrylate and the like.
  • These (meth) acrylate oligomers or resins may contain a copolymerizable monomer exemplified in the section of (meth) acrylic resin in the polymer component.
  • These photocurable compounds can be used alone or in combination of two or more.
  • the curable resin precursor may contain a curable compound containing a fluorine atom from the viewpoint of improving the strength of the hard coat layer.
  • fluorine-containing curable compounds include fluorides of the monomers and oligomers such as fluorinated alkyl (meth) acrylates [for example, perfluorooctylethyl (meth) acrylate and trifluoro Ethyl (meth) acrylate, etc.], fluorinated (poly) oxyalkylene glycol di (meth) acrylate [eg, fluoroethylene glycol di (meth) acrylate, fluoropropylene glycol di (meth) acrylate, etc.], fluorine-containing epoxy resin, fluorine Examples thereof include urethane-based resins.
  • a preferable curable resin precursor is a photocurable compound that can be cured in a short time, for example, an ultraviolet curable compound (such as a monomer, an oligomer, or a resin that may have a low molecular weight) or an EB curable compound.
  • an ultraviolet curable compound such as a monomer, an oligomer, or a resin that may have a low molecular weight
  • an EB curable compound is an ultraviolet curable resin.
  • the photocurable resin is a bifunctional or higher (preferably about 2 to 10 functional, more preferably about 3 to 8 functional) photocurable compound, particularly a polyfunctional (meth) acrylate.
  • a trifunctional or higher functional (particularly 4 to 8 functional) (meth) acrylate for example, dipentaerythritol hexa (meth) acrylate.
  • a 5- to 7-functional (meth) acrylate may be combined with a 2- to 4-functional (meth) acrylate [particularly, a 3- to 4-functional (meth) acrylate such as pentaerythritol tri (meth) acrylate].
  • the number average molecular weight of the curable resin precursor is, for example, 5000 or less, preferably 2000 or less, and more preferably about 1000 or less in terms of polystyrene in gel permeation chromatography (GPC).
  • the cellulose nanofiber is not particularly limited as long as it is formed of a polysaccharide having a ⁇ -1,4-glucan structure.
  • cellulose fiber derived from higher plants for example, wood fiber ( Wood pulps such as conifers, hardwoods, etc., bamboo fibers, sugarcane fibers, seed hair fibers (cotton linters, Bombax cotton, kapok etc.), gin leather fibers (eg hemp, mulberry, mitsumata etc.), leaf fibers (eg, Natural cellulose fibers (pulp fibers, etc.) such as Manila hemp and New Zealand hemp]], animal-derived cellulose fibers (eg squirt cellulose), bacteria-derived cellulose fibers, chemically synthesized cellulose fibers [cellulose acetate (cellulose acetate) , Cellulose propionate, cellulose butyrate, Organic acid esters such as roulose acetate propionate and cellulose acetate butyrate; inorganic acid esters
  • cellulose fibers derived from higher plants such as wood fibers (wood pulp such as conifers and hardwoods) and seed hair fibers, are highly productive and have an appropriate fiber diameter and fiber length.
  • a cellulose fiber derived from pulp such as cotton linter pulp is preferred.
  • the average fiber diameter of the cellulose nanofiber is not particularly limited as long as it is a nanometer size. For example, it is 10 to 500 nm, preferably 20 to 300 nm, more preferably 30 to 200 nm (particularly 50 to 100 nm). If the average fiber diameter is too small, it will be difficult to form an uneven structure. If the average fiber diameter is too large, it becomes difficult to form a large uneven structure with a gentle slope.
  • a large concavo-convex structure can be formed by manufacturing under specific conditions using a nanometer-sized fiber without using a particle having a large particle size, and thus the concavo-convex structure can be formed even for a thin hard coat layer Can be formed.
  • the standard deviation of the fiber diameter distribution is, for example, 80 nm or less (for example, 1 to 80 nm), preferably 3 to 50 nm, more preferably 5 to 40 nm (particularly 10 to 30 nm) from the viewpoint that a uniform uneven structure can be formed. It may be a degree. Further, the maximum fiber diameter may be less than 500 nm, for example, about 30 to 300 nm, preferably about 40 to 200 nm, and more preferably about 50 to 100 nm.
  • the average fiber length of the cellulose nanofibers may be about 10 ⁇ m or more, and can be selected, for example, from the range of about 10 to 1000 ⁇ m. From the point that a predetermined uneven structure can be formed on the surface of the hard coat layer and the optical characteristics can be improved.
  • the thickness is about 20 to 900 ⁇ m, preferably about 30 to 800 ⁇ m (for example, 35 to 700 ⁇ m), more preferably about 40 to 600 ⁇ m (particularly about 50 to 500 ⁇ m). If the average fiber length is too small, it will be difficult to form an uneven structure. If the average fiber length is too large, the concavo-convex structure becomes too large, it is difficult to form a gentle concavo-convex structure, and the sharpness of the image is deteriorated.
  • the ratio of average fiber length to average fiber diameter is about 40 or more, for example, 50 to 50000, preferably 80 to 25000, and more preferably 150 to 10000. (Especially about 500 to 6000).
  • appropriately entangled nanofibers are produced by convection in the production process. After separation into a dense region and a sparse region, an appropriate uneven structure can be formed because a convex portion is formed in the dense region.
  • the cross-sectional shape of the cellulose nanofiber may be an anisotropic shape (flat shape) such as bacterial cellulose. Isotropic shape.
  • the substantially isotropic shape include a perfect circle shape and a regular polygon shape.
  • the ratio of the major axis to the minor axis is, for example, 1 to 2, preferably 1 to 1. 0.5, more preferably about 1 to 1.3 (particularly about 1 to 1.2).
  • Cellulose nanofibers may be prepared in the state of a dispersion (or suspension) by dispersing in water in a curable composition.
  • the solid concentration in the dispersion is, for example, about 0.01 to 50% by weight, preferably about 0.1 to 30% by weight, more preferably about 0.3 to 10% by weight (particularly 0.5 to 5% by weight). is there.
  • the ratio of cellulose nanofibers can be selected from a range of, for example, about 0.01 to 3 parts by weight with respect to 100 parts by weight of the curable resin precursor, but an appropriate uneven structure can be formed without deteriorating optical properties. From this point, for example, it is about 0.02 to 2 parts by weight, preferably about 0.03 to 1 part by weight, more preferably about 0.04 to 0.5 parts by weight (particularly 0.05 to 0.3 parts by weight). . If the proportion of cellulose nanofiber is too small, it will be difficult to form an uneven structure. If the ratio of cellulose nanofibers is too large, the optical properties will deteriorate.
  • the curable composition further comprises an ethylenically unsaturated bond involved in the curing reaction of the curable resin precursor in order to improve mechanical properties such as flexibility.
  • the polymer which does not have may be included.
  • polymers examples include olefin resins, styrene resins, (meth) acrylic resins, organic acid vinyl ester resins, vinyl ether resins, halogen-containing resins, polycarbonates, polyesters, polyamides, thermoplastic polyurethanes, Examples include polysulfone resins, polyphenylene ether resins, cellulose derivatives, silicone resins, rubbers, and elastomers. These polymers can be used alone or in combination of two or more.
  • styrene resins styrene resins
  • (meth) acrylic resins alicyclic olefin resins
  • polyesters cellulose derivatives, etc.
  • Cellulose derivatives are preferred from the viewpoint that the mechanical properties can be improved.
  • Cellulose derivatives include cellulose esters, cellulose ethers, and cellulose carbamates.
  • cellulose esters examples include aliphatic organic acid esters (cellulose acetate such as cellulose diacetate and cellulose triacetate; cellulose C 2 ⁇ such as cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate). 6 acylates), aromatic organic acid esters (C 7-12 aromatic carboxylic acid esters such as cellulose phthalate and cellulose benzoate), inorganic acid esters (eg cellulose phosphate, cellulose sulfate and the like), and the like.
  • the cellulose esters may be mixed acid esters such as acetic acid and cellulose nitrate esters.
  • cellulose ethers include cyanoethyl cellulose; hydroxy C 2-4 alkyl cellulose such as hydroxyethyl cellulose and hydroxypropyl cellulose; C 1-6 alkyl cellulose such as methyl cellulose and ethyl cellulose; carboxymethyl cellulose or a salt thereof, benzyl cellulose, acetylalkyl A cellulose etc. can be illustrated.
  • cellulose carbamates include cellulose phenyl carbamate.
  • Cellulose C 2-4 acylates such as cellulose diacetate, cellulose acetate propionate, cellulose acetate butyrate (especially cellulose acetate C 3-4 acylates such as cellulose acetate propionate) to suppress and enhance storage stability Is preferred.
  • the ratio of the polymer is, for example, 0.01 to 30 parts by weight, preferably 0.05 to 20 parts by weight (for example, 0.1 to 5 parts by weight) with respect to 100 parts by weight of the curable resin precursor. More preferably, it is about 0.2 to 3 parts by weight (particularly 0.3 to 1 part by weight).
  • the balance between the hard coat property and the mechanical properties can be adjusted by adjusting the ratio of the polymer. When the ratio is within this range, the balance between the two is excellent.
  • the curable composition may further contain inorganic particles from the viewpoint of improving optical properties such as transparency.
  • the shape of the inorganic particles is not particularly limited, and examples thereof include a spherical shape, an elliptical shape, a polygonal shape (polygonal pyramid shape, a rectangular parallelepiped shape, a rectangular parallelepiped shape, etc.), a plate shape, a rod shape, and an indefinite shape.
  • a spherical shape an elliptical shape, a polygonal shape (polygonal pyramid shape, a rectangular parallelepiped shape, a rectangular parallelepiped shape, etc.), a plate shape, a rod shape, and an indefinite shape.
  • an isotropic shape such as a substantially spherical shape is preferable from the viewpoint of optical characteristics.
  • the average particle size of the inorganic particles is 100 nm or less, preferably 80 nm or less (for example, 10 to 80 nm), more preferably about 20 to 70 nm. If the average particle size of the inorganic particles is too small, the effect of reducing haze and reflectance is reduced. If the average particle size of the inorganic particles is too large, the surface uneven structure is affected and the optical properties are deteriorated.
  • the inorganic particles preferably have a low refractive index, and the refractive index is, for example, about 1.2 to 1.5, preferably about 1.21 to 1.4, and more preferably about 1.22 to 1.35. May be. When the refractive index is too large, the sharpness of the image is deteriorated.
  • the inorganic particles include simple metals, metal oxides, metal sulfates, metal silicates, metal phosphates, metal carbonates, metal hydroxides, silicon compounds, fluorine compounds, and natural minerals.
  • the inorganic particles may be surface-treated with a coupling agent (titanium coupling agent, silane coupling agent).
  • a coupling agent titanium coupling agent, silane coupling agent.
  • metal oxide particles such as titanium oxide
  • silicon compound particles such as silicon oxide
  • fluorine compound particles such as magnesium fluoride are preferable from the viewpoint of transparency and the like, and low reflection and low haze are preferable.
  • Silica particles are particularly preferable in that
  • the silica particles may be silica particles having hollow portions inside (hollow silica particles). Since the hollow silica particles have a low refractive index, low reflection and low haze can be improved efficiently.
  • the shape and size of the hollow part in the hollow silica particles are not particularly limited, and the refractive index of the particles may be in the above range.
  • the hollow silica particles may usually have a single hollow portion (in the case of a spherical particle, a spherical hollow portion) as a core with respect to the outer shell (shell) of the particle. May have a hollow portion (such as a spherical shape or an ellipsoidal shape).
  • Such hollow silica particles are described in JP-A Nos. 2001-233611 and 2003-192994.
  • the hollow silica particles described in these documents have a low refractive index, are particles in a colloidal region, and are excellent in dispersibility.
  • the hollow silica particles described in these documents can be preferably used. Hollow silica particles can be produced by the production methods described in these documents.
  • the inorganic particles may be unevenly distributed near the surface of the hard coat layer.
  • the reflectance of the optical film can be lowered.
  • the composition of the dispersion may be adjusted as appropriate.
  • the inorganic particles may be in the form of a dispersion dispersed in a solvent in the curable composition.
  • the solvent include water, alcohols (such as ethanol and isopropanol), and ketones (such as acetone and methyl ethyl ketone).
  • the solid content concentration of the inorganic particles in the dispersion is, for example, about 0.1 to 50% by weight, preferably about 1 to 40% by weight, and more preferably about 5 to 30% by weight.
  • the proportion of the inorganic particles is, for example, 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.1 parts by weight with respect to 100 parts by weight of the curable resin precursor. It is about 5 to 3 parts by weight (particularly 1 to 2 parts by weight). If the proportion of the inorganic particles is too small, the effect of improving the optical properties is small. When there are too many ratios of an inorganic particle, a mechanical characteristic will fall and haze will increase.
  • the curable composition may contain a curing agent depending on the type of the curable resin precursor.
  • a curing agent for example, in a thermosetting resin, amines, polyvalent carboxylic acids, etc.
  • a curing agent may be included.
  • the curable composition may contain a polymerization initiator.
  • the polymerization initiator may be a thermal polymerization initiator (thermal radical generator such as peroxide such as benzoyl peroxide) or a photopolymerization initiator (photo radical generation) depending on the type of curable resin precursor. Agent).
  • a preferred polymerization initiator is a photopolymerization initiator. Examples of the photopolymerization initiator include acetophenones or propiophenones, benzyls, benzoins, benzophenones, thioxanthones, and acylphosphine oxides.
  • the photopolymerization initiator may contain conventional photosensitizers and photopolymerization accelerators (for example, tertiary amines such as dialkylaminobenzoate esters, phosphine photopolymerization accelerators, etc.).
  • photopolymerization accelerators for example, tertiary amines such as dialkylaminobenzoate esters, phosphine photopolymerization accelerators, etc.
  • the ratio of the curing agent and / or polymerization initiator is 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, more preferably 100 parts by weight of the curable resin precursor.
  • the amount is preferably about 1 to 8 parts by weight (particularly 1 to 5 parts by weight), and may be about 3 to 8 parts by weight.
  • the solvent can be selected according to the type and solubility of the curable resin precursor and the polymer, and at least solids (the curable resin precursor, the polymer, the reaction initiator, and other additives) are uniformly dissolved.
  • Any solvent can be used.
  • solvents include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons ( Cyclohexane etc.), aromatic hydrocarbons (toluene, xylene etc.), halogenated hydrocarbons (dichloromethane, dichloroethane etc.), esters (methyl acetate, ethyl acetate, butyl acetate etc.), water, alcohols (ethanol, isopropanol) , Butanol,
  • ketones such as methyl ethyl ketone, alcohols such as butanol, and cellosolves such as propylene glycol monomethyl ether are preferable, and these solvents may be mixed.
  • the ratio of the solvent can be selected from the range of about 10 to 1000 parts by weight with respect to 100 parts by weight of the curable resin precursor, and for example, 50 to 500 parts by weight, preferably 80 to 400 parts by weight, and more preferably 100 to 300 parts by weight. About parts by weight.
  • conventional additives such as organic particles, stabilizers (antioxidants, ultraviolet absorbers, etc.), surfactants, water-soluble polymers are used as long as the optical properties of the hard coat layer are not impaired.
  • the curable composition can form a concavo-convex structure without using a flocculant, and is substantially a flocculant (for example, a flocculant of fine particles described in JP-A-2009-265143) from the viewpoint of optical characteristics and the like. Etc.) are preferred.
  • the curable composition may be a thermosetting composition or a photocurable compound that can be cured in a short time, for example, an ultraviolet curable compound or an EB curable compound. Good.
  • a resin precursor that is practically advantageous and easily forms an uneven structure is an ultraviolet curable resin.
  • the thickness of the hard coat layer is, for example, about 0.5 to 30 ⁇ m, preferably about 1 to 25 ⁇ m, more preferably about 3 to 20 ⁇ m (particularly about 5 to 15 ⁇ m).
  • a thin hard coat layer having a thickness of 30 ⁇ m or less can be formed in spite of having a large uneven structure having an Sm value of 600 ⁇ m or more.
  • transparent film examples include resin sheets in addition to glass and ceramics.
  • resin which comprises a transparent film resin similar to the said hard-coat layer can be used.
  • Preferred transparent films include transparent polymer films such as cellulose derivatives [cellulose triacetate (TAC), cellulose acetate such as cellulose diacetate], polyester resins [polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly Arylate resins, etc.], polysulfone resins [polysulfone, polyethersulfone, etc.], polyether ketone resins [polyether ketone, polyether ether ketone, etc.], polycarbonate resins (bisphenol A type polycarbonate, etc.), polyolefin resins ( Polyethylene, polypropylene, etc.), cyclic polyolefin resin [TOPAS (registered trademark), ARTON (registered trademark), Zeonet ZEONEX (registered trademark, etc.),
  • These films can be appropriately selected according to the application, and when an optical film is used for the upper electrode substrate of the touch panel (the electrode substrate on the side in contact with a pressing member such as a finger or a pen), flexibility is required.
  • a plastic sheet or film unstretched or stretched plastic sheet or film can be used.
  • optically isotropic transparent film examples include glass, unstretched or stretched plastic sheet or film, for example, polyester (PET, PBT, etc.), cellulose derivatives, particularly cellulose esters (cellulose diacetate, A sheet or film formed of cellulose acetate such as cellulose triacetate, cellulose acetate propionate, cellulose acetate C 3-4 acylate such as cellulose acetate butyrate, or the like is preferable.
  • a cellulose derivative is used as the thermoplastic resin of the hard coat layer, the adhesion between the two can be improved by using a film composed of the cellulose derivative as the transparent film.
  • the thickness of the transparent film can be selected from the range of, for example, about 5 to 2000 ⁇ m, preferably 15 to 1000 ⁇ m, and more preferably about 20 to 500 ⁇ m.
  • the optical film of the present invention has high antiglare property and anti-Newton ring property, but haze is suppressed and high transparency.
  • the optical film of the present invention has a haze according to JIS K7136 of, for example, 0.1 to 2%, preferably 0.15 to 1.5%, more preferably 0.2 to 1% (particularly 0.3 to 0.8%). If the haze is too low, it is difficult to form a concavo-convex structure. If the haze is too high, the image becomes whitish and a clear image cannot be displayed.
  • the optical film of the present invention has a total light transmittance according to JIS K7136 of, for example, about 70 to 100%, preferably 80 to 100%, more preferably 85 to 99% (particularly 90 to 95%). .
  • the transmitted image with a width of 0.125 mm is, for example, 1 to 67%, preferably 1. It is about 5 to 55%, more preferably about 2 to 50% (especially 5 to 40%).
  • the transmitted image definition with an optical comb width of 0.25 mm is, for example, about 2 to 67%, preferably about 3 to 60%, more preferably about 4 to 55% (particularly about 8 to 50%).
  • the transmitted image clarity with an optical comb width of 0.5 mm is, for example, about 10 to 85%, preferably about 15 to 80%, more preferably about 20 to 75% (particularly about 25 to 70%).
  • the transmitted image definition with an optical comb width of 1 mm is, for example, about 50 to 95%, preferably 55 to 93%, and more preferably about 60 to 92% (particularly 70 to 90%).
  • the transmitted image definition with an optical comb width of 2 mm is, for example, about 80 to 99%, preferably 85 to 98%, more preferably 90 to 98% (particularly 94 to 98%).
  • C (%) [(M ⁇ m) / (M + m)] ⁇ 100 That is, the closer the value of C is to 100%, the smaller the blur of the image due to the transparent conductive film [Reference: Suga, Mitamura, Painting Technology, July 1985 issue].
  • the optical film of the present invention may have a surface reflectance of 10% or less, for example, 1 to 10%, preferably 2 to 8%, more preferably about 3 to 5%.
  • the surface reflectance may be lowered by including inorganic particles having a low refractive index in the hard coat layer.
  • the surface reflectance is 4% or less, preferably 1 to 4%, more preferably 2 to 3 It may be 5% or less.
  • a low refractive index layer may be further formed on the hard coat layer in order to reduce the surface reflectance.
  • a transparent conductive layer for example, a metal oxide such as indium oxide-tin oxide composite oxide (ITO) is further formed on the hard coat layer. You may laminate the transparent conductive layer comprised by these, and the transparent conductive layer comprised by the conductive polymer.
  • ITO indium oxide-tin oxide composite oxide
  • the optical film of the present invention has a hard coat property and high antiglare property or anti-Newton ring property. Furthermore, the clarity of the transmitted image is excellent, and there is little character blur on the display surface. Therefore, the optical film of the present invention can be used for various display devices such as a liquid crystal display (LCD) device, a plasma display, and a display device with a touch panel. For example, it can be used as an antiglare film provided in an LCD device or an electrode substrate for a touch panel, and other optical elements (for example, various optical elements disposed in an optical path such as a polarizing plate, a retardation plate, a light guide plate). And may be combined.
  • LCD liquid crystal display
  • plasma display a plasma display
  • a display device with a touch panel a display device with a touch panel.
  • other optical elements for example, various optical elements disposed in an optical path such as a polarizing plate, a retardation plate, a light guide plate. And may be combined.
  • the optical film of the present invention is not particularly limited as long as the uneven structure can be formed on the surface of the hard coat layer, and a conventional method can be used.
  • the hard coat layer is formed of a cured product of the curable composition
  • the optical film of the present invention is coated with a coating solution containing the curable composition on the transparent film, dried, and then activated energy rays. Can be obtained by curing with irradiation.
  • the coating liquid is usually a mixed liquid (especially a liquid such as a uniform solution) containing the curable resin precursor, cellulose nanofibers, a solvent, and, if necessary, a polymer or inorganic particles having no ethylenically unsaturated bond.
  • Composition contains a photocurable compound, cellulose nanofibers, a cellulose derivative, hollow silica, a photopolymerization initiator, and a solvent capable of dissolving the photocurable compound and the cellulose derivative.
  • a composition is used.
  • the concentration of the solute (curable resin precursor, cellulose nanofiber, polymer, inorganic particles, reaction initiator, other additives) in the mixed solution can be selected within a range that does not impair the castability and coating properties. It is about 1 to 80% by weight, preferably 5 to 60% by weight, more preferably 15 to 50% by weight (especially 20 to 45% by weight).
  • a transparent film may melt
  • a coating solution uniform solution
  • an optically isotropic solvent-resistant coating layer may be formed by previously applying a solvent-resistant coating agent on the application surface of a transparent film (such as a triacetyl cellulose film).
  • Such coating layers include, for example, thermoplastic resins such as styrene-acrylonitrile copolymers (AS resins), polyester resins, polyvinyl alcohol resins (polyvinyl alcohol, ethylene-vinyl alcohol copolymers), and epoxy resins. Further, it can be formed using a curable resin such as a silicone resin or an ultraviolet curable resin. Moreover, when apply
  • a coating method for example, spray, roll coater, air knife coater, blade coater, rod coater, reverse coater, bar coater, comma coater, dip squeeze coater, die coater, gravure coater, micro gravure coater, silk Examples include screen coater method, dip method, spray method, spinner method and the like. Of these methods, the bar coater method and the gravure coater method are widely used. If necessary, the coating solution may be applied a plurality of times.
  • the solvent is evaporated.
  • the evaporation of the solvent can be usually selected from a range of about 30 to 200 ° C., for example, depending on the boiling point of the solvent.
  • the drying temperature is used to form a specific uneven structure on the surface of the hard coat layer. Is important, and can be selected depending on the type of the curable resin precursor. For example, it is 70 ° C. or less (for example, 20 to 65 ° C.), preferably 30 to 65 ° C., more preferably 40 to 60 ° C. (especially 45 to 60 ° C.). Degree). If the drying temperature is too high, the drying time is shortened and the occurrence of convection is suppressed, so that it is difficult to develop the uneven structure.
  • the cellulose nanofibers dispersed in the coating liquid are appropriately aggregated together with the curing of the curable composition, although the coating liquid does not contain a flocculant, and the resin component becomes a nucleus. It can be presumed that it is raised and forms an uneven structure on the surface.
  • the hard coat layer having such a concavo-convex structure is finally cured with actinic rays (ultraviolet rays, electron beams, etc.) or heat to form a cured resin.
  • Curing of the precursor may be combined with heating, light irradiation, etc., depending on the type of curable resin precursor. Among these, light irradiation is preferable because a specific uneven structure can be easily formed.
  • the light irradiation can be selected according to the type of the photocuring component or the like, and usually ultraviolet rays, electron beams, etc. can be used.
  • a Deep UV lamp for example, in the case of ultraviolet rays, a Deep UV lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a halogen lamp, a laser light source (light source such as helium-cadmium laser or excimer laser), etc. may be used. it can.
  • Irradiation light amount varies depending on the thickness of the coating film, for example, 50 ⁇ 10000mJ / cm 2, preferably 70 ⁇ 7000mJ / cm 2, more preferably may be 100 ⁇ 5000mJ / cm 2 approximately.
  • a method of irradiating an electron beam with an exposure source such as an electron beam irradiation apparatus can be used.
  • the irradiation amount (dose) varies depending on the thickness of the coating film, but is, for example, about 1 to 200 kGy (gray), preferably 5 to 150 kGy, more preferably 10 to 100 kGy (particularly 20 to 80 kGy).
  • the acceleration voltage is, for example, about 10 to 1000 kV, preferably about 50 to 500 kV, and more preferably about 100 to 300 kV.
  • a general-purpose exposure source is usually an ultraviolet irradiation device.
  • light irradiation may be performed in an inert gas atmosphere if necessary.
  • the precursor when photocuring is utilized, not only can the precursor be immediately fixed by curing the precursor, but also the precipitation of low molecular components such as oligomers from the inside of the transparent film due to heat can be suppressed.
  • the hard coat layer can be given scratch resistance, and when used in a touch panel, even if the operation is repeated, damage to the surface structure can be suppressed, and durability can be improved.
  • the hard coat layer may be subjected to a surface treatment in order to improve the adhesion of other layers (for example, a low refractive index layer or a transparent conductive layer) to the hard coat layer.
  • a surface treatment include conventional surface treatments such as corona discharge treatment, flame treatment, plasma treatment, ozone and ultraviolet irradiation treatment.
  • a black film is pasted on the transparent film side of the optical film, and a fluorescent lamp (10000 cd / m 2 ) exposed from a fluorescent tube is projected on the film surface from a point 2 m away, and the degree of blurring of the reflected image is visually observed.
  • the evaluation was based on the following criteria.
  • ⁇ The outline of the fluorescent lamp is not known or is slightly understood. ⁇ : The fluorescent lamp is partially blurred but the outline is clearly visible. ⁇ : The fluorescent lamp is hardly blurred and the outline is very clear.
  • Glare is not felt.
  • O Glare is slightly felt.
  • X Glare is felt.
  • the transmitted image was determined by attaching the obtained optical film on a 42-inch full HD liquid crystal television (number of pixels 1080 ⁇ 1920) using a double-sided tape (manufactured by Nitto Denko Corporation, CS9621). These images were displayed, and the transmission images were visually evaluated according to the following criteria.
  • the surface layer side polarizing plate of the LCD monitor used was a clear type polarizing plate.
  • A The transmitted image looks completely clear.
  • O The transmitted image looks clear, but is slightly inferior to a normal clear liquid crystal television.
  • ⁇ The transmitted image looks a little white.
  • X The transmitted image appears blurred and unclear.
  • Hard coat layer coating solution NC-1 50 parts by weight of dipentaerythritol hexaacrylate (manufactured by Daicel Cytec Co., Ltd., DPHA), 50 parts by weight of pentaerythritol triacrylate (manufactured by Daicel Cytec Co., Ltd., PETIA), cellulose acetate propionate (manufactured by Eastman Corporation, 0.5 part by weight of CAP) is dissolved in a mixed solvent of 100 parts by weight of methyl ethyl ketone (MEK), 50 parts by weight of 1-methoxy-2-propanol (MMPG) and 50 parts by weight of 1-butanol (BuOH) (boiling point 113 ° C.).
  • MEK methyl ethyl ketone
  • MMPG 1-methoxy-2-propanol
  • BuOH 1-butanol
  • NC-1 a hard coat layer coating solution
  • NC-2 A hard coat layer coating solution: NC-2 was prepared in the same manner as NC-1, except that the average fiber length of the cellulose nanofibers was changed to about 400 ⁇ m.
  • NC-3 was prepared in the same manner as NC-1, except that the average fiber length of the cellulose nanofibers was changed to about 200 ⁇ m.
  • NC-4 was prepared in the same manner as NC-1, except that the average fiber length of the cellulose nanofibers was changed to about 100 ⁇ m.
  • Hard coat layer coating solution NC-5
  • NC-5 was prepared in the same manner as NC-1, except that the amount of cellulose nanofiber added was changed to 3 parts by weight.
  • Hard coat layer coating solution NC-6
  • NC-6 was prepared in the same manner as NC-2 except that the amount of cellulose nanofiber added was changed to 3 parts by weight.
  • Hard coat layer coating solution NC-7
  • NC-7 was prepared in the same manner as NC-3 except that the amount of cellulose nanofiber added was changed to 3 parts by weight.
  • Hard coat layer coating solution NC-8
  • NC-8 was prepared in the same manner as NC-4, except that the amount of cellulose nanofiber added was changed to 3 parts by weight.
  • Hard coat layer coating solution in the same manner as NC-8, except that the addition amount of dipentaerythritol hexaacrylate (DPHA) was changed to 20 parts by weight and the addition amount of pentaerythritol triacrylate (PETIA) was changed to 50 parts by weight: NC-9 was prepared.
  • DPHA dipentaerythritol hexaacrylate
  • PETIA pentaerythritol triacrylate
  • NC-10 was prepared in the same manner as NC-1, except that the average fiber length of cellulose nanofibers was changed to about 60 ⁇ m and the addition amount was changed to 10 parts by weight.
  • NC-11 Hard coat layer coating solution: NC-11 was prepared in the same manner as NC-10, except that the amount of cellulose nanofiber added was changed to 15 parts by weight.
  • Hard coat layer coating solution NCL-1
  • A2SL-02SH hollow silica
  • alcohol dispersion manufactured by JGC Catalysts & Chemicals Co., Ltd. 7 parts by weight of hollow silica
  • NCL-1 7 parts by weight alcohol dispersion manufactured by JGC Catalysts & Chemicals Co., Ltd.
  • Hard coat layer coating solution NCL-2
  • a hard coat layer coating solution NCL-2 was prepared in the same manner as NC-5, except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-3
  • a hard coat layer coating solution: NCL-3 was prepared in the same manner as NC-6 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-4
  • a hard coat layer coating solution: NCL-4 was prepared in the same manner as NC-7 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-5
  • a hard coat layer coating solution: NCL-5 was prepared in the same manner as NC-8 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-6
  • a hard coat layer coating solution NCL-6 was prepared in the same manner as NC-9 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-7
  • a hard coat layer coating solution: NCL-7 was prepared in the same manner as NC-10 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • Hard coat layer coating solution NCL-8
  • a hard coat layer coating solution: NCL-8 was prepared in the same manner as NC-11 except that 7 parts by weight of hollow silica (A2SL-02SH) was added.
  • a hard coat layer coating solution: HC-1 was added in the same manner as NC-1 except that 0.1 part by weight of a fluorine leveling agent was added together with the initiator without ultrasonic treatment. Prepared.
  • Hard coat layer coating solution HC-2
  • silica particles (Seahosta KE-P150” manufactured by Nippon Shokubai Co., Ltd., average particle size: 1.5 ⁇ m)
  • a hard coat layer coating solution HC-2 was prepared.
  • a hard coat layer coating solution HC-3 was prepared in the same manner as HC-1, except that 1 part by weight of styrene beads (average particle size 3.5 ⁇ m) was added.
  • a hard coat layer coating solution: HC-4 was prepared in the same manner as HC-1, except that 20 parts by weight of acrylic beads (average particle size: 7 ⁇ m) was added.
  • Example 1 A triacetyl cellulose film (manufactured by Fuji Film Co., Ltd., TAC, thickness 80 ⁇ m) was used as the transparent film, and the hard coat layer coating solution NC-1 was applied onto the film using a bar coater # 26. Then, it was dried at 50 ° C. for 1 minute. The coated film is passed through an ultraviolet irradiation device (USHIO INC., High pressure mercury lamp, ultraviolet irradiation amount: 800 mJ / cm 2 ) to perform ultraviolet curing treatment, and a hard coat layer having a hard coat property and a surface uneven structure. Formed. The thickness of the hard coat layer in the obtained optical film was about 8 ⁇ m.
  • Examples 2 to 19 and Comparative Examples 1 and 2 An optical film was prepared in the same manner as in Example 1 except that hard coat layer coating solutions NC-2 to 11, NCL1 to 8, and HC-1 to 2 were used instead of the hard coat layer coating solution NC-1. did.
  • the thickness of the hard coat layer was about 7 ⁇ m in Example 3 (NC-3) and Example 6 (NC-6), about 9 ⁇ m in Example 12 (NCL-1), and Comparative Example 1 (HC-1).
  • Example 3 Example 3
  • Example 6 NC-6
  • HC-1 Comparative Example 1
  • HC-1 Comparative Example 1
  • Comparative Example 3 An optical film was produced in the same manner as in Example 1 except that the drying temperature after coating was changed to 80 ° C.
  • the thickness of the hard coat layer in the obtained optical film was about 8 ⁇ m.
  • Comparative Examples 4-5 Instead of the hard coat layer coating solution NC-1, a hard coat layer coating solution HC-3 or HC-4 was used, and the drying temperature after coating was changed to 70 ° C., as in Example 1. An optical film was prepared. The thickness of the hard coat layer in the obtained optical film was about 6 ⁇ m in Comparative Example 4 (HC-3) and about 12 ⁇ m in Comparative Example 5 (HC-4).
  • Table 1 shows the results of measuring the optical properties of the optical films obtained in Examples and Comparative Examples
  • Table 2 shows the results of measuring the surface structure and the evaluation results of various properties.
  • the optical films of the examples are excellent in optical properties and mechanical properties.
  • the optical film of the comparative example has low optical properties.
  • the optical film of the present invention can be used in various display devices such as liquid crystal display (LCD) devices, cathode ray tube display devices, organic or inorganic electroluminescence (EL) displays, field emission displays (FED), surface electric field displays (SED), It can be used as an optical film used in display devices such as a rear projection television display, a plasma display, and a display device with a touch panel.
  • LCD liquid crystal display
  • EL organic or inorganic electroluminescence
  • FED field emission displays
  • SED surface electric field displays
  • It can be used as an optical film used in display devices such as a rear projection television display, a plasma display, and a display device with a touch panel.
  • the touch panel is a display device (liquid crystal display device, plasma display device, organic or inorganic EL display device) in a display unit of an electric / electronic or precision device such as a personal computer, a television, a mobile phone, a game machine, a mobile device, a clock, a calculator, etc. Etc.) may be used in combination with the touch panel (especially resistive film type touch panel).
  • a display device liquid crystal display device, plasma display device, organic or inorganic EL display device
  • an electric / electronic or precision device such as a personal computer, a television, a mobile phone, a game machine, a mobile device, a clock, a calculator, etc. Etc.
  • the optical film of the present invention is particularly useful as an antiglare film for LCDs and an anti-Newton ring film for touch panels.

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Abstract

L'invention concerne un film optique apte à afficher une image nette sans délaver la couleur, tout en améliorant les propriétés d'anti-éblouissement ou d'anti-anneau de Newton. Un film optique comporte un film transparent et une couche de revêtement dure formée sur le film transparent, une structure irrégulière ayant une distance moyenne concave à convexe (Sm) de 600 à 1500 µm et une rugosité arithmétique moyenne Ra de 0,04 à 0,2 µm étant formée sur la surface de ladite couche de revêtement dure. La pente moyenne arithmétique (ִa) dans ladite structure irrégulière peut être de 0,05 à 5°. Le flou dans ledit film optique peut être de 0,1 à 2 %. Ladite couche de revêtement dure peut être formée à partir d'une matière durcie d'une composition durcissable comportant un précurseur de résine durcissable et une nanofibre de cellulose. Ladite nanofibre de cellulose a un diamètre de fibre moyen d'approximativement 10 à 500 nm et peut avoir une longueur moyenne de fibre d'approximativement 20 à 500 µm.
PCT/JP2012/063148 2011-05-31 2012-05-23 Film optique et procédé de fabrication de celui-ci WO2012165246A1 (fr)

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