WO2018105213A1 - 光学フィルム、並びに、それを用いた光学バリアフィルム、色変換フィルム及びバックライトユニット - Google Patents
光学フィルム、並びに、それを用いた光学バリアフィルム、色変換フィルム及びバックライトユニット Download PDFInfo
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- WO2018105213A1 WO2018105213A1 PCT/JP2017/035849 JP2017035849W WO2018105213A1 WO 2018105213 A1 WO2018105213 A1 WO 2018105213A1 JP 2017035849 W JP2017035849 W JP 2017035849W WO 2018105213 A1 WO2018105213 A1 WO 2018105213A1
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- film
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- barrier
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Definitions
- the present disclosure relates to an optical film, and an optical barrier film, a color conversion film, and a backlight unit using the optical film.
- the invention described in Patent Document 1 relates to a light diffusing sheet used in lighting fixtures, electrical signs, rear projection screens, liquid crystal displays, and the like.
- the light diffusing sheet described in Patent Literature 1 includes a light diffusing layer containing true spherical particles made of polymethyl methacrylate.
- the present disclosure is intended to provide an optical film having sufficiently small in-plane variation in haze value, and an optical barrier film, a color conversion film, and a backlight unit using the optical film.
- This optical film includes a first film substrate and a coating layer formed on the first film substrate, and the coating layer has a binder resin and an average particle diameter of 0.5 ⁇ m or more and 10.0 ⁇ m or less. And fine particles having a standard deviation of the particle size of less than 1/2 of the average particle size.
- the average particle size is within a predetermined range (0.5 ⁇ m or more and 10.0 ⁇ m or less), and the standard particle size. Since the deviation is less than 1 ⁇ 2 of the average particle diameter, an optical film having a coating layer with sufficiently small in-plane variation in haze value is provided. More specifically, the following problems can be solved.
- a coating layer can be formed on the first film substrate by, for example, wet coating.
- Wet coating is a method of forming a coating layer through a step of applying a coating liquid containing a binder resin and fine particles dispersed therein onto a first film substrate. If the dispersion (standard deviation) in the particle size of the fine particles themselves contained in the coating liquid is large, the particle size distribution of the fine particles observed in the coating layer formed becomes inevitably large.
- the particle size design value of the fine particles is sufficiently small, if the dispersibility of the fine particles in the binder resin is insufficient due to aggregation of the fine particles, the fine particles observed in the formed coating layer The particle size distribution of is larger than the particle size design value of the fine particles. According to the study by the present inventors, if the variation in the particle size of the fine particles contained in the coating layer is large, the light diffusibility (haze value) expressed by the coating layer is not stable (in-plane variation in the optical film increases). There are challenges.
- the thickness of the optical film affects the coating thickness of the color conversion material.
- the thickness of the optical film affects the coating thickness of the color conversion material.
- the variation in the particle size of the fine particles contained in the optical film is large, for example, the large particles are in a state protruding from the surface of the binder resin, and this portion can be the maximum thickness of the optical film, This also causes variations in the performance of the color conversion film. According to the optical film according to the present disclosure, these problems can be sufficiently solved.
- the arithmetic average roughness Ra of the coating layer 14 is preferably 0.4 ⁇ m or less.
- the hardness of the coating layer is H in pencil hardness. It is preferably in the range of ⁇ 2H. Since the variation in the particle size of the fine particles in the coating layer is sufficiently small, the variation in pencil hardness in the coating layer can also be sufficiently small.
- the hardness of the fine particles is preferably 100 or less on the Rockwell R hardness scale. When the hardness of the fine particles is within the above range, damage to the coating layer and other members can be suppressed.
- the surface resistivity of the coating layer is preferably 1.0 ⁇ 10 13 ⁇ / ⁇ or less. When the surface resistivity of the coating layer is within the above range, antistatic performance can be suitably imparted to the coating layer.
- the present disclosure provides an optical barrier film according to the first aspect.
- the optical barrier film includes a barrier layer and the optical film, and the barrier layer is formed on the surface of the optical film on the first film substrate side.
- the present disclosure provides an optical barrier film according to a second aspect.
- the optical barrier film includes a barrier composite layer including a second film substrate and a barrier layer, and the optical film, and the barrier composite layer is formed on the surface of the optical film on the first film substrate side.
- the optical barrier film of these aspects includes the optical film, it is possible to solve the above-described problems, and while suppressing blocking with other members in contact with the optical barrier film, the coating layer and other Damage to the member can be suppressed.
- the barrier layer preferably includes an inorganic vapor-deposited thin film layer made of silicon oxide represented by SiO x (1.0 ⁇ x ⁇ 2.0).
- SiO x silicon oxide represented by SiO x (1.0 ⁇ x ⁇ 2.0).
- the color conversion film includes a color conversion layer and two protective films arranged so as to sandwich the color conversion layer, and at least one of the two protective films is the optical barrier film, and the optical barrier The film is arranged so that the coating layer faces away from the color conversion layer. Since this color conversion film includes the optical barrier film, it is possible to solve the above-mentioned problems and suppress the light guide plate from being damaged even when it is overlapped with the light guide plate constituting the backlight unit, for example. can do. Further, since the barrier layer itself is also prevented from being damaged, the intrusion of air and water vapor into the color conversion layer is appropriately reduced, and the color conversion performance of the color conversion film can be maintained over a long period of time. .
- the backlight unit includes a light source, a light guide plate, and the color conversion film disposed on the light guide plate, and the color conversion film is disposed such that the coating layer is in contact with the light guide plate. . Since this backlight unit includes the color conversion film, it is possible to solve the above-described problems and to prevent the light guide plate in contact with the color conversion film from being damaged. In addition, since the barrier layer itself is also prevented from being damaged, the penetration of air and water vapor into the color conversion layer is appropriately reduced, and good white light is obtained from the backlight unit over a long period of time. be able to.
- an optical film having sufficiently small in-plane variation in haze value, an optical barrier film, a color conversion film, and a backlight unit using the optical film are provided.
- FIG. 1 is a schematic cross-sectional view of an optical film according to an embodiment of the present disclosure.
- FIG. 2 is a schematic cross-sectional view of the optical barrier film according to the first embodiment of the present disclosure.
- FIG. 3 is a schematic cross-sectional view of an optical barrier film according to a second embodiment of the present disclosure.
- FIG. 4 is a schematic cross-sectional view of an optical barrier film according to a third embodiment of the present disclosure.
- FIG. 5 is a schematic cross-sectional view of an optical barrier film according to a fourth embodiment of the present disclosure.
- FIG. 6 is a schematic cross-sectional view of a color conversion film according to an embodiment of the present disclosure.
- FIG. 7 is a schematic cross-sectional view of a backlight unit according to an embodiment of the present disclosure.
- FIG. 1 is a schematic cross-sectional view of an optical film according to an embodiment of the present disclosure.
- FIG. 2 is a schematic cross-sectional view of the optical barrier film according to the first embodiment of
- FIG. 8A is an image showing the optical film coating layer according to Example 2 enlarged with an optical microscope, and FIG. 8B further enlarges the circled particles in FIG. 8A. It is the image shown.
- FIG. 9 is an optical microscope image showing a portion where fine particles are recognized to have been cut off in the coating layer of the optical film according to Example 2.
- FIG. 1 is a schematic cross-sectional view of an optical film according to an embodiment of the present disclosure.
- the optical film 10 includes a first film substrate 12 and a coating layer 14 formed on the first film substrate 12.
- the coating layer 14 is a layer having a function of diffusing light, and is sometimes referred to as a “matte layer”.
- the coating layer 14 contains fine particles 18, and at least some of the fine particles 18 protrude on the surface of the coating layer 14 on the side opposite to the first film substrate 12. Since at least some of the plurality of fine particles 18 in the coating layer 14 protrude from the surface of the coating layer 14, the coating layer 14 can have an uneven shape on the surface.
- the coating layer 14 has a concavo-convex shape on the surface opposite to the first film substrate 12, that is, by having the concavo-convex surface 14 ⁇ / b> A, when another member is stacked on the surface of the coating layer 14 of the optical film 10.
- the term “projecting” the microparticles 18 on the surface of the coating layer 14 means that the surface of the portion of the coating layer 14 where the microparticles 18 are not present is a reference plane, and at least a part of the surface of the microparticles 18 is outside the reference plane As long as it is located in The surface of the protruding fine particles 18 may be exposed or may be covered with a binder resin or the like which will be described later.
- the average particle diameter of the fine particles 18 is 0.5 ⁇ m or more and 10.0 ⁇ m or less, preferably 1.0 ⁇ m or more and 10.0 ⁇ m or less, and more preferably 2.0 ⁇ m or more and 8.0 ⁇ m or less.
- the average particle size of the fine particles 18 is 0.5 ⁇ m or more, it becomes easy to suppress the occurrence of blocking between the coating layer 14 and other members in contact therewith.
- the average particle diameter of the fine particles 18 is 10.0 ⁇ m or less, the protruding fine particles 18 can easily control the uneven shape of the surface of the coating layer 14, and thus other members in contact with the uneven surface 14 ⁇ / b> A of the coating layer 14. It becomes easy to suppress damage.
- the standard deviation of the particle diameter of the fine particles 18 is less than 1/2 of the average particle diameter of the fine particles 18, preferably less than 1/3, and more preferably less than 1/4. If this value is less than 1 ⁇ 2, the in-plane variation of the haze value (cloudiness) in the coating layer 14 can be sufficiently reduced. In addition, the fact that the standard deviation of the particle diameter of the fine particles 18 is less than 1 ⁇ 2 of the average particle diameter of the fine particles 18 means that there are sufficiently few particles having excessively large particle diameters. In the process, it is possible to sufficiently suppress problems of powderiness (powder falling) and appearance due to separation of large particles after application.
- the thickness of the coating layer 14 can be controlled by adjusting the application amount, and therefore, it is easy to form the coating layer 14 having a desired thickness.
- the lower limit of this value is about 1/5 from the viewpoint of the manufacturing technique of the fine particles 18.
- the detachment (powder off) of the fine particles from the coating layer 14 can be sufficiently suppressed if the coating layer 14 has few particles having an excessively large particle size. Whether or not the coating layer 14 has many large particles (whether or not powder is likely to fall off) can be determined by measuring the arithmetic average roughness Ra of the coating layer 14. From the viewpoint of sufficiently suppressing powder falling, the arithmetic average roughness Ra of the coating layer 14 is preferably 0.4 ⁇ m or less, and more preferably 0.3 ⁇ m or less.
- the pencil hardness of the coating layer 14 is preferably in the range of H to 2H. Since the variation in the particle size of the fine particles 18 included in the coating layer 14 is sufficiently small, the variation in pencil hardness in the coating layer 14 can also be sufficiently small. When the pencil hardness of the coating layer 14 is H or more, the coating layer 14 can be prevented from being damaged by another member (for example, a prism sheet). On the other hand, when the pencil hardness of the coating layer 14 is 2H or less, the coating layer 14 can be inhibited from damaging other members (for example, the light guide plate).
- the pencil hardness here is a value measured according to JIS K5600-5-4: 1999 (ISO / DIS 15184: 1996) “Scratch hardness (pencil method)”, and a load of 500 g is applied to the tip of the pencil. Means the measured value.
- the thickness of the coating layer 14 is preferably 0.5 ⁇ m to 30 ⁇ m.
- the thickness of the coating layer 14 is an average thickness including an uneven shape.
- the thickness of the coating layer 14 is measured by a mass method according to JIS K5600. When the coating layer 14 has a thickness in this range, the fine particles 18 easily protrude from the surface of the coating layer 14, and the uneven surface 14 ⁇ / b> A is easily formed on the coating layer 14.
- the content of the fine particles 18 in the coating layer 14 is preferably 2 to 80% by mass, and more preferably 5 to 50% by mass based on the total amount of the coating layer 14.
- the content of the fine particles 18 is 2% by mass or more, the fine particles 18 are likely to protrude on the surface of the coating layer 14, and the occurrence of blocking between the coating layer 14 and other members in contact with the coating layer 14 is easily suppressed.
- the content of the fine particles 18 is 80% by mass or less, it is easy to suppress damage to other members in contact with the uneven surface 14A of the coating layer 14.
- the proportion of the fine particles 18 protruding from the surface of the coating layer 14 is preferably 10 to 100%, and more preferably 50 to 100%.
- the ratio of the protruding fine particles 18 is 10% or more, the occurrence of blocking is easily suppressed.
- the hardness of the fine particles 18 is 100 or less on the Rockwell R hardness scale, and preferably 90 or less. When the hardness of the fine particles 18 on the Rockwell R hardness scale is 100 or less, it is easy to suppress damage of other members in contact with the concavo-convex surface 14A of the coating layer 14 due to the protruding fine particles 18. From the same viewpoint, the hardness of the fine particles 18 is preferably 50 or less on the Rockwell M hardness scale.
- the fine particles 18 are not particularly limited as long as the Rockwell hardness is within the above range, and may be inorganic fine particles or organic fine particles.
- the fine particles 18 are preferably organic fine particles.
- the organic fine particles include polyolefin resins such as polypropylene; polyamide resins such as nylon; acrylic urethane resins; styrene resins; urethane resins; benzoguanamine resins;
- the fine particles 18 are more preferably at least one organic fine particle selected from the group consisting of polyolefin resin, polyamide resin, urethane resin, and silicone resin, and more preferably polypropylene resin particles or urethane resin particles.
- the fine particles 18 are organic fine particles, the fine particles 18 are likely to be spherical particles, and shape control to a smooth uneven shape is facilitated.
- the fine particles 18 may be used singly or in combination of a plurality of types.
- the coating layer 14 can also contain the particle
- the coating layer 14 may contain a conductive material.
- the surface resistivity of the coating layer 14 tends to decrease.
- the surface resistivity of the coating layer 14 is preferably 1.0 ⁇ 10 13 ⁇ / ⁇ or less.
- the coating layer 14 is preferably provided with antistatic performance, so that adhesion or contamination of dust or the like to the coating layer 14 is reduced. Tend to. For this reason, in the manufacturing process of a backlight unit etc., there exists a tendency for the damage of the coating layer 14 or other members resulting from dust to decrease.
- the conductive material include a quaternary ammonium salt compound, a conductive polymer, and a metal oxide.
- a conductive material may be used individually by 1 type, and may be used in combination of multiple types.
- the quaternary ammonium salt compound is a compound having a quaternary ammonium salt in the molecule as a functional group, for example, a (meth) acrylate compound having a quaternary ammonium salt in the molecule as a functional group.
- the (meth) acrylate compound having a quaternary ammonium salt in the molecule as a functional group is, for example, a (meth) acrylic acid ester of a polyhydric alcohol having a quaternary ammonium salt in the molecule (that is, a quaternary ammonium salt).
- (Meth) acrylate ester compound (Meth) acrylate ester compound), or a reaction product (ie, quaternary ammonium salt urethane (meth) acrylate compound) such as diisocyanate, polyhydric alcohol, and hydroxyalkyl ester of (meth) acrylic acid.
- a polyether resin having an acrylate functional group a polyester resin, an epoxy resin, an alkyd resin, a spiroacetal resin, a polybutadiene resin, a polythiol polyene resin, or the like can also be used.
- a quaternary ammonium salt comprises a quaternary ammonium cation and an anion.
- Examples of the quaternary ammonium salt anion include Cl ⁇ , Br ⁇ , I ⁇ , F ⁇ , HSO 4 ⁇ , SO 4 2 ⁇ , NO 3 ⁇ , PO 4 3 ⁇ , HPO 4 2 ⁇ , H 2 PO 4. -, SO 3 -, OH -, and the like.
- Conductive polymers are polyacetylene, polyaniline, polythiophene, polypyrrole, polyphenylene sulfide, poly (1,6-heptadiyne), polybiphenylene (polyparaphenylene), polyparaphenylene sulfide, polyphenylacetylene, poly (2,5-thienylene) ), And a derivative thereof, or a mixture of two or more thereof.
- metal oxide examples include zirconium oxide, antimony-containing tin oxide (ATO), phosphorus-containing tin oxide (PTO), tin-containing indium oxide, aluminum oxide, cerium oxide, zinc oxide, aluminum-containing zinc oxide, tin oxide, and lithium. Salt, antimony containing zinc oxide, indium containing zinc oxide, etc. are mentioned.
- the particle diameter of the conductive material is, for example, 500 nm or less, and preferably 100 nm or less.
- the surface resistivity of the coating layer 14 is obtained without impairing the effect of suppressing scratches even when particles having Rockwell hardness not within the above range are used as the conductive material. Tends to be reduced.
- the content of the conductive material in the coating layer 14 is appropriately set for each type of conductive material so that the surface resistivity of the coating layer 14 falls within a desired range.
- the content of the conductive material in the coating layer 14 may be 30% by mass or less.
- the coating layer 14 further contains a binder resin 16.
- the binder resin 16 is a resin excellent in optical transparency, and may be a molded body of a thermoplastic resin, or may be a cured product of a thermosetting resin or a radiation curable resin.
- the resin constituting the binder resin include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, and polycarbonate resins. , Cellulose resin, acetal resin, polyethylene resin, polystyrene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin and the like.
- the cured product of the thermosetting resin may be a reaction product of the thermosetting resin and a curing agent.
- the binder resin 16 is preferably a cured product of a thermosetting resin having a hydroxyl group and an isocyanate curing agent.
- the isocyanate group of the isocyanate curing agent reacts with the hydroxyl group of the thermosetting resin, and the thermosetting resin and the isocyanate curing agent can be cured.
- the isocyanate curing agent is preferably an isocyanate curing agent having two or more isocyanate groups, and more preferably a diisocyanate curing agent having two isocyanate groups, from the viewpoint of crosslinking the polyol resin.
- the diisocyanate curing agent include aliphatic diisocyanates such as hexamethylene diisocyanate and xylylene diisocyanate, aromatic diisocyanates such as toluene diisocyanate and diphenylmethane diisocyanate, and derivatives thereof.
- the coating layer 14 is formed, for example, by applying the coating layer composition on the first film substrate 12 and drying and curing or molding the coating film as necessary.
- the coating layer composition includes, for example, the above-described fine particles 18, a conductive material, and a thermoplastic resin, a thermosetting resin, or a radiation curable resin.
- the coating layer composition may further contain a solvent, a photopolymerization initiator, a leveling agent, or a lubricant.
- a roll coater, reverse roll coater, gravure coater, micro gravure coater, knife coater, bar coater, wire bar coater, die coater, dip coater or the like is used.
- the coating film is dried by heating or blowing.
- the drying temperature is, for example, about 60 to 100 ° C.
- the drying time is, for example, about 10 seconds to 10 minutes. Most of the solvent is removed from the coating film by the drying.
- the coating film after drying is heated.
- the heating temperature is, for example, about 50 to 100 ° C.
- the heating time is, for example, about 12 hours to 3 days.
- the coating is cured by the heating.
- the coating film after drying is irradiated with radiation.
- the radiation can be, for example, ultraviolet light or an electron beam.
- Ultraviolet rays are generated from a light source such as a high pressure mercury lamp, a low pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a carbon arc, and a xenon arc.
- the electron beam is generated from various electron beam accelerators such as a Cockloftwald type, a bandegraph type, a resonant transformation type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type.
- the coating film is cured by the radiation irradiation.
- the first film substrate 12 can be, for example, an organic polymer film.
- the first film substrate 12 is preferably transparent, and specifically, the total light transmittance of the first film substrate 12 is preferably 80% or more.
- the first film substrate 12 include a polyolefin film substrate such as polyethylene and polypropylene, a polyester film substrate such as polyethylene terephthalate and polyethylene naphthalate, and a cellulose film substrate such as triacetyl cellulose, diacetyl cellulose, and cellophane.
- polyamide film substrate such as 6-nylon, 6,6-nylon
- acrylic film substrate such as polymethyl methacrylate
- polystyrene film substrate polystyrene film substrate
- polyvinyl chloride film substrate polyimide film substrate
- It can be a polyvinyl alcohol film substrate, a polycarbonate film substrate, and an ethylene vinyl alcohol film substrate.
- the thickness of the first film substrate 12 is preferably 5 ⁇ m or more and 300 ⁇ m or less, for example.
- the strength of the first film substrate 12 is improved.
- the first film substrate 12 can be easily handled. Tend to be.
- the thickness of the first film substrate 12 is 300 ⁇ m or less, the first film substrate 12 tends to be easily handled during the film-forming process using the roll-to-roll method.
- FIG. 2 is a schematic cross-sectional view of the optical barrier film according to the first embodiment of the present disclosure.
- the optical barrier film 20 ⁇ / b> A includes a barrier layer 24 and the optical film 10.
- the barrier layer 24 is formed on the surface of the optical film 10 on the first film substrate 12 side. That is, the optical barrier film 20A is formed on the first film substrate 12, the coating layer 14 formed on one surface of the first film substrate 12, and the other surface of the first film substrate 12. It can also be said that the barrier layer 24 is provided.
- the coating layer 14 has sufficiently small in-plane variation in haze value, the in-plane variation in haze value of the optical barrier film 20 ⁇ / b> A can be sufficiently reduced.
- the optical film 10 has an uneven shape on the surface on the coating layer 14 side, that is, has an uneven surface 14A. Thereby, when another member is piled up on the surface of optical film 10 (coating layer 14) of optical barrier film 20A, blocking with the other member concerned can be controlled. Even if the optical barrier film 20A is overlapped with another member, the coating layer 14 and the other member in contact with the uneven surface 14A of the coating layer 14 can be prevented from being damaged by the protruding fine particles 18.
- the barrier layer 24 may be formed on the surface of the optical film 10 on the first film substrate 12 side via an adhesion layer.
- the barrier layer 24 is a layer that can block gas intrusion.
- the barrier layer 24 preferably includes an inorganic thin film layer.
- the inorganic thin film layer contains an inorganic compound and preferably contains a metal or a metal oxide.
- the metal include aluminum, copper, and silver.
- the metal oxide can be, for example, at least one metal oxide selected from the group consisting of yttrium tantalum oxide, aluminum oxide, silicon oxide, and magnesium oxide, and is inexpensive. From the viewpoint of excellent barrier performance for blocking intrusion of water vapor or the like, silicon oxide is preferable.
- the silicon oxide is represented by SiO x , and x in the formula is preferably 1.5 or more and 2.0 or less. When x is 1.5 or more, more preferably 1.7 or more, the transparency tends to be improved.
- the inorganic thin film layer is preferably formed by, for example, an evaporation method or a sputtering method, and is an inorganic evaporation thin film layer formed by an evaporation method.
- the thickness of the inorganic thin film layer is preferably 10 to 300 nm, and more preferably 20 to 100 nm. When the thickness of the inorganic thin film layer is 10 nm or more, a uniform film tends to be obtained and gas barrier properties tend to be easily obtained. On the other hand, when the thickness of the inorganic thin film layer is 300 nm or less, the inorganic thin film layer can be kept flexible, and cracks and the like tend not to occur due to external forces such as bending and pulling after film formation.
- the barrier layer 24 may include a gas barrier coating layer.
- the bus barrier coating layer is preferably formed from a composition containing at least one selected from the group consisting of a metal alkoxide represented by the following formula (1) and a hydrolyzate thereof. M (OR 1 ) m (R 2 ) nm (1)
- R 1 and R 2 are each independently a monovalent organic group having 1 to 8 carbon atoms, preferably an alkyl group such as a methyl group or an ethyl group.
- M represents an n-valent metal atom such as Si, Ti, Al, or Zr.
- m is an integer of 1 to n.
- the metal alkoxide include tetraethoxysilane [Si (OC 2 H 5 ) 4 ], triisopropoxyaluminum [Al (O-iso-C 3 H 7 ) 3 ] and the like.
- the metal alkoxide is preferably tetraethoxysilane or triisopropoxyaluminum because it is relatively stable in an aqueous solvent after hydrolysis.
- Examples of the hydrolyzate of the metal alkoxide include silicic acid (Si (OH) 4 ) that is a hydrolyzate of tetraethoxysilane and aluminum hydroxide (Al (OH) 3 that is a hydrolyzate of tripropoxyaluminum. ) And the like. These can be used in combination of not only one type but also a plurality of types.
- the above composition may further contain a hydroxyl group-containing polymer compound.
- the hydroxyl group-containing polymer compound include water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone and starch.
- the hydroxyl group-containing polymer compound is preferably polyvinyl alcohol from the viewpoint of barrier properties. These can be used in combination of not only one type but also a plurality of types.
- the content of the hydroxyl group-containing polymer compound in the composition is, for example, 10 to 90% by mass.
- the thickness of the gas barrier coating layer is preferably 50 to 1000 nm, and preferably 100 to 500 nm. When the thickness of the gas barrier coating layer is 50 nm or more, a sufficient gas barrier property tends to be obtained, and when it is 1000 nm or less, a sufficient flexibility tends to be maintained.
- the barrier layer 24 includes both the inorganic thin film layer and the gas barrier coating layer
- the inorganic thin film layer is formed on the surface of the first film substrate 12
- the gas barrier coating layer is formed on the surface of the inorganic thin film layer. It may be.
- FIG. 3 is a schematic cross-sectional view of an optical barrier film according to a second embodiment of the present disclosure.
- the optical barrier film 20 ⁇ / b> B includes the barrier composite layer 22 a including the second film substrate 12 a and the barrier layer 24 a, and the optical film 10.
- the barrier composite layer 22a is formed on the optical film 10 via the adhesive layer 26a so that the first film substrate 12 and the barrier layer 24a face each other.
- the material of the second film substrate 12a may be the same as that of the first film substrate 12.
- the thickness of the second film substrate 12a is preferably 5 ⁇ m or more and 50 ⁇ m or less, for example.
- the thickness of the second film substrate 12a is 5 ⁇ m or more, the strength of the second film substrate 12a is improved.
- the second film substrate 12a can be easily handled. Tend to be.
- the thickness of the second film substrate 12a is 50 ⁇ m or less, it is possible to suppress a decrease in barrier properties due to intrusion of water vapor or oxygen from the substrate end surface.
- the adhesive layer 26a is formed from an adhesive or a pressure-sensitive adhesive.
- the adhesive include acrylic adhesives, epoxy adhesives, urethane adhesives, and the like.
- the adhesive preferably includes an epoxy resin. When the adhesive contains an epoxy resin, the adhesion between the optical film 10 and the barrier composite layer 22a can be improved.
- the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, polyvinyl ether-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and starch paste-based adhesives.
- the thickness of the adhesive layer 26a is preferably 0.5 to 50 ⁇ m, more preferably 1 to 20 ⁇ m, and even more preferably 2 to 6 ⁇ m.
- the thickness of the adhesive layer 26a is 0.5 ⁇ m or more, it becomes easy to obtain adhesion between the optical film 10 and the barrier composite layer 22a, and when the thickness is 50 ⁇ m or less, more excellent gas barrier properties. Tends to be easily obtained.
- the optical barrier film 20B according to the second embodiment forms the barrier composite layer 22a by forming the barrier layer 24a on the second film substrate 12a separately from the optical film 10, and then the optical film 10 and the barrier. It can be obtained by bonding the composite layer 22a and performing aging as necessary.
- the manufacturing method of the optical barrier film 20B according to the second embodiment is not limited to the above.
- FIG. 4 is a schematic cross-sectional view of an optical barrier film according to a third embodiment of the present disclosure.
- the optical barrier film 20 ⁇ / b> C includes the barrier composite layer 22 a including the second film substrate 12 a and the barrier layer 24 a, and the optical film 10.
- the barrier composite layer 22a is formed on the optical film 10 via the adhesive layer 26a so that the first film substrate 12 and the second film substrate 12a face each other.
- FIG. 5 is a schematic cross-sectional view of an optical barrier film according to a fourth embodiment of the present disclosure.
- an optical barrier film 20D includes a barrier composite layer 22a including a second film substrate 12a and a barrier layer 24a, a barrier composite layer 22b including a third film substrate 12b and a barrier layer 24b, and an optical film 10.
- the barrier composite layer 22a is formed on the optical film 10 via the adhesive layer 26a so that the first film base 12 and the second film base 12a face each other, and the barrier composite layer 22b is formed of the barrier layer 24a.
- the barrier layer 24b are formed on the barrier composite layer 22a with an adhesive layer 26b interposed therebetween.
- FIG. 6 is a schematic cross-sectional view of a color conversion film according to an embodiment of the present disclosure.
- the color conversion film is a film that can convert some wavelengths of light from the light source of the backlight unit for liquid crystal display.
- the color conversion film 30 includes a color conversion layer 32 and an optical barrier film 20 arranged so as to sandwich the color conversion layer 32.
- the optical barrier film 20 may be any of the optical barrier films 20A, 20B, 20C, and 20D described above, and the configurations of the two optical barrier films 20 may be the same as or different from each other.
- the optical barrier film 20 is disposed on the color conversion layer 32 so that the coating layer 14 faces the side opposite to the color conversion layer 32.
- the color conversion film 30 has the uneven surfaces 20F and 20G derived from the uneven surface 14A of the coating layer 14. As described above, since the variation in the particle size of the fine particles contained in the coating layer 14 included in the optical barrier film 20 is sufficiently small, the variation in the performance of the color conversion film 30 can be sufficiently reduced.
- the color conversion film 30 has the uneven surfaces 20F and 20G on the surface, when other members are stacked on the uneven surfaces 20F and 20G of the color conversion film 30, blocking with the other members can be suppressed. it can. Moreover, even if the color conversion film 30 is overlapped with, for example, the light guide plate constituting the backlight unit, the light guide plate can be prevented from being damaged by the protruding fine particles 18. Further, since the barrier layer itself is also prevented from being damaged, the intrusion of air and water vapor into the color conversion layer 32 is appropriately reduced, and the color conversion performance in the color conversion film 30 is maintained for a long period of time. .
- the color conversion film according to the present disclosure is not limited to the above embodiment.
- the color conversion film 30 having the configuration in which the color conversion layer 32 is sandwiched between two optical barrier films 20 (protective films) is illustrated, but one of the two protective films sandwiching the color conversion layer 32 is optical.
- the barrier film 20 may be a protective film having another configuration.
- the color conversion layer 32 includes a resin and a phosphor.
- the thickness of the color conversion layer 32 is several tens to several hundreds ⁇ m.
- the resin for example, a photocurable resin or a thermosetting resin can be used.
- the color conversion layer 32 preferably includes two types of phosphors made of luminescent nanocrystals (quantum dots).
- the color conversion layer 32 may be formed by laminating two or more phosphor layers including one type of phosphor and another type of phosphor. Two types of phosphors having the same excitation wavelength are selected. The excitation wavelength is selected based on the wavelength of light emitted from the light source of the backlight unit. The fluorescent colors of the two types of phosphors are different from each other.
- the fluorescent colors are red and green.
- the wavelength of each fluorescence and the wavelength of light emitted from the light source are selected based on the spectral characteristics of the color filter.
- the peak wavelength of fluorescence is, for example, 610 nm for red and 550 nm for green.
- the core-shell luminescent nanocrystal is manufactured from, for example, a material containing an inorganic material, preferably a material containing an inorganic conductor or a semiconductor material.
- semiconductor materials include II-VI, III-V, IV-VI, and IV semiconductors. More specifically, the semiconductor material is, for example, Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP.
- Nanocrystals can include, for example, p-type or n-type dopants. Nanocrystals can also include, for example, II-VI or III-V semiconductors. II-VI semiconductor nanocrystals include, for example, any combination of Group II elements such as Zn, Cd, and Hg and Group VI elements such as S, Se, Te, and Po. III-V semiconductor nanocrystals can comprise any combination of Group III elements such as B, Al, Ga, In, and Tl and Group V elements such as N, P, As, Sb, and Bi. Including.
- the core-shell type light-emitting nanocrystal is obtained by covering a semiconductor crystal core as a light-emitting portion with a shell as a protective film.
- a semiconductor crystal core as a light-emitting portion
- a shell as a protective film.
- CdSe cadmium selenide
- ZnS zinc sulfide
- the surface yield of CdSe particles is covered with ZnS having a large band gap, so that the quantum yield is improved.
- the phosphor may be one in which the core is doubly covered with the first shell and the second shell.
- CdSe can be used for the core
- zinc selenide (ZnSe) can be used for the first shell
- ZnS can be used for the second shell.
- the color conversion layer 32 may have a single-layer configuration in which all the phosphors are dispersed in a single layer, and has a multilayer configuration in which each phosphor is separately dispersed in a plurality of layers and these are laminated. You may do it.
- a method for manufacturing the color conversion film 30 of this embodiment will be described.
- a method for forming the color conversion layer 32 is not particularly limited, and examples thereof include a method described in the specification of JP-T-2013-544018.
- the prepared phosphor dispersion is applied on the surface of the optical barrier film 20 (first protective film) opposite to the coating layer 14, and then another optical barrier film 20 is applied to the coated surface.
- the color conversion film 30 can be manufactured by bonding the (second protective film) so that the coating layer 14 faces the side opposite to the color conversion layer 32 and curing the color conversion layer 32.
- FIG. 7 is a schematic cross-sectional view of a backlight unit according to an embodiment of the present disclosure.
- the backlight unit 40 includes a light source 42, a light guide plate 46, and a color conversion film 30 disposed on the light guide plate 46.
- the color conversion film 30 is disposed such that the uneven surface 20 ⁇ / b> F (that is, the uneven surface 14 ⁇ / b> A of the coating layer 14) is in contact with the light guide plate 46.
- the light guide plate 46 and the reflection plate 44 are arranged in this order on the uneven surface 20F of the color conversion film 30, and the light source 42 is located on the side of the light guide plate 46 (the surface of the light guide plate 46).
- the light guide plate 46 and the reflection plate 44 are arranged in this order on the uneven surface 20F of the color conversion film 30, and the light source 42 is located on the side of the light guide plate 46 (the surface of the light guide plate 46).
- the backlight unit 40 includes the color conversion film 30 with sufficiently small in-plane variation in performance, variations in performance (color development, luminance, etc.) of the backlight unit 40 can be sufficiently reduced.
- the backlight unit 40 can suppress the light guide plate 46 in contact with the color conversion film 30 from being damaged.
- the barrier layer itself is also prevented from being damaged, the penetration of air and water vapor into the color conversion layer is appropriately reduced, and good white light can be obtained from the backlight unit over a long period of time. .
- the light guide plate 46 and the reflection plate 44 efficiently reflect and guide the light emitted from the light source 42, and a known material is used.
- a known material is used as the light guide plate 46.
- acrylic, polycarbonate, cycloolefin film, or the like is used.
- the material used for the light guide plate 46 often does not have a large hardness and tends to be easily damaged by contact with other members.
- polycarbonate is generally used because of its high transparency and ease of processing, but it has a low surface hardness and is easily damaged.
- the light source 42 includes a plurality of blue light emitting diode elements.
- the light emitting diode element may be a violet light emitting diode or a light emitting diode having a lower wavelength.
- Light emitted from the light source 42 is incident on the light guide plate 46 (D 1 direction) is incident on the color conversion layer 32 with a reflection and refraction, etc. (D 2 direction).
- the light that has passed through the color conversion layer 32 becomes white light by mixing the yellow light generated in the color conversion layer 32 with the light before passing through the color conversion layer 32.
- the “average particle diameter” and “standard deviation of particle diameter” of the fine particles contained in the main agents 1 and 2 were measured as follows. That is, the main agent was put in a glass bottle, shaken 100 times, and then ethyl acetate was added. The average particle size of the fine particles contained in the sample thus obtained and the standard deviation of the particle size were measured using a laser diffraction / scattering particle size distribution measuring device (Nikkiso Co., Ltd., Microtrac MT3300 (trade name)). . Table 1 shows the results.
- the coating layer composition formed by mixing the composition shown in Table 2 was apply
- the coating amount was changed by using wire bars having different counts, whereby the coating layers having different thicknesses were formed on the first film base. Each was formed on a material.
- haze and total light transmittance The haze and total light transmittance of the optical films according to Examples and Comparative Examples were measured using a haze meter (turbidimeter) NDH-2000 (trade name, manufactured by Nippon Denshoku Industries Co., Ltd.).
- the optical films obtained in Examples and Comparative Examples were cut to a size of 4 cm ⁇ 4 cm, and the optical film coating layer and the polycarbonate film were stacked so as to be in contact with each other, and 30 at room temperature under a load of 25 kgf / cm 2. Left for a second. Thereafter, the optical film and the polycarbonate film were observed visually and with a microscope, and scratch resistance was evaluated according to the following criteria.
- the polycarbonate film was prepared by imitating the light guide plate of the backlight unit. The thickness of the polycarbonate film was 188 ⁇ m.
- C Scratches are noticeable in at least one of the optical film coating layer and the polycarbonate film.
- the haze value of the optical film of Example 2 (coating layer thickness 4.5 ⁇ m) is 44.0%, while the optical film of Comparative Example 1 (coating layer thickness 6.0 ⁇ m). ) was 40.3%, and both values were relatively close. Therefore, as described below, in-plane variation of haze was evaluated by measuring haze for each of a plurality of portions of the optical films of Example 2 and Comparative Example 1, and physical properties of fine particles contained in these coating layers ( The average particle size and the standard deviation of the particle size) were measured.
- FIG.8 (a) is an image which expands and shows the coating layer of the optical film which concerns on Example 2 with an optical microscope
- FIG.8 (b) further expands the particle
- Example 6 Evaluation of pencil strength of coating layer
- a coating layer composition obtained by mixing the compositions shown in Table 8 was applied on a first film substrate having a width of 210 mm, and a coating film was formed over a length of 300 mm using a wire bar coater. Subsequently, this coating film was heated at 80 ° C. for 30 seconds to dry the coating film. The dried coating film was aged at 60 ° C. for 2 days to produce optical films of Example 6 and Comparative Example 2, respectively. In Example 6 and Comparative Example 2, the thickness of the coating layer formed on the first film substrate was 3 ⁇ m. In Example 6, the same components as in Examples 1 to 5 were used, and in Comparative Example 2, the same components as in Comparative Example 1 were used.
- Example 12 Pencil strength of each of the coating layers according to Example 6 and Comparative Example 2 was measured according to JIS K5600-5-4: 1999 “Scratch hardness (pencil method)”. The load applied to the tip of the pencil was 500 g. Table 9 shows the results.
- an optical film having sufficiently small in-plane variation in haze value, an optical barrier film, a color conversion film, and a backlight unit using the optical film are provided.
- SYMBOLS 10 Optical film, 12 ... 1st film base material, 14 ... Coating layer, 14A ... Uneven surface, 16 ... Binder resin, 18 ... Fine particle, 20A, 20B, 20C, 20D, 20 ... Optical barrier film, 22a, 22b ... Barrier composite layer, 24, 24a, 24b ... barrier layer, 30 ... color conversion film, 32 ... color conversion layer, 40 ... backlight unit.
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Abstract
Description
図1は本開示の一実施形態に係る光学フィルムの概略断面図である。図1において、光学フィルム10は、第一フィルム基材12と、該第一フィルム基材12上に形成されたコーティング層14とを備える。
コーティング層14は光を拡散させる機能を有する層であり、「マット層」などと称されることもある。コーティング層14は微粒子18を含有し、少なくとも一部の微粒子18がコーティング層14の第一フィルム基材12と反対側の表面に突出している。コーティング層14中の複数の微粒子18のうちの少なくとも一部の微粒子がコーティング層14の表面に突出していることにより、コーティング層14は表面に凹凸形状を有することができる。コーティング層14が第一フィルム基材12と反対側の表面に凹凸形状を有する、すなわち、凹凸面14Aを有することにより、光学フィルム10のコーティング層14の表面上に他の部材を重ねた場合に、当該他の部材とのブロッキング(貼り付き)を抑制することができる。なお、微粒子18がコーティング層14の表面上に「突出する」とは、コーティング層14の微粒子18のない部分の表面を基準面として、微粒子18の表面の少なくとも一部の領域が当該基準面外側に位置していればよい。突出した微粒子18の表面はむき出しになっていてもよく、後述するバインダー樹脂等で覆われていてもよい。
第一フィルム基材12は、例えば、有機高分子フィルムであることができる。第一フィルム基材12は透明であることが好ましく、具体的には、第一フィルム基材12の全光線透過率が80%以上であることが好ましい。第一フィルム基材12としては、例えば、ポリエチレン、ポリプロピレン等のポリオレフィン系フィルム基材、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系フィルム基材、トリアセチルセルロース、ジアセチルセルロース、セロファン等のセルロース系フィルム基材、6-ナイロン、6,6-ナイロン等のポリアミド系フィルム基材、ポリメチルメタクリレート等のアクリル系フィルム基材、ポリスチレン系フィルム基材、ポリ塩化ビニル系フィルム基材、ポリイミド系フィルム基材、ポリビニルアルコール系フィルム基材、ポリカーボネート系フィルム基材、及びエチレンビニルアルコール系フィルム基材であることができる。
(第一実施形態)
図2は本開示の第一実施形態に係る光学バリアフィルムの概略断面図である。図2において、光学バリアフィルム20Aは、バリア層24と、光学フィルム10とを備える。バリア層24は、光学フィルム10の第一フィルム基材12側の面上に形成されている。すなわち、光学バリアフィルム20Aは、第一フィルム基材12と、第一フィルム基材12の一方の面上に形成されたコーティング層14と、第一フィルム基材12の他方の面上に形成されたバリア層24とを備えるということもできる。上述のとおり、コーティング層14は、ヘイズ値の面内バラツキが十分に小さいため、光学バリアフィルム20Aのヘイズ値の面内バラツキも十分に小さくすることができる。
M(OR1)m(R2)n-m ・・・(1)
図3は本開示の第二実施形態に係る光学バリアフィルムの概略断面図である。図3において、光学バリアフィルム20Bは、第二フィルム基材12a及びバリア層24aを含むバリア複合層22aと、光学フィルム10と、を備える。バリア複合層22aは、第一フィルム基材12とバリア層24aとが対向するように、光学フィルム10上に接着層26aを介して形成されている。
図4は本開示の第三実施形態に係る光学バリアフィルムの概略断面図である。図4において、光学バリアフィルム20Cは、第二フィルム基材12a及びバリア層24aを含むバリア複合層22aと、光学フィルム10と、を備える。バリア複合層22aは、第一フィルム基材12と第二フィルム基材12aとが対向するように、光学フィルム10上に接着層26aを介して形成されている。
図5は本開示の第四実施形態に係る光学バリアフィルムの概略断面図である。図5において、光学バリアフィルム20Dは、第二フィルム基材12a及びバリア層24aを含むバリア複合層22aと、第三フィルム基材12b及びバリア層24bを含むバリア複合層22bと、光学フィルム10と、を備える。バリア複合層22aは、第一フィルム基材12と第二フィルム基材12aとが対向するように、光学フィルム10上に接着層26aを介して形成されおり、バリア複合層22bは、バリア層24aとバリア層24bとが対向するように、バリア複合層22a上に接着層26bを介して形成されている。
図6は本開示の一実施形態に係る色変換フィルムの概略断面図である。色変換フィルムは液晶ディスプレイ用バックライトユニットの光源からの光の一部の波長を変換可能なフィルムである。図6において、色変換フィルム30は、色変換層32と、色変換層32を挟むように配置された光学バリアフィルム20とを備える。光学バリアフィルム20は、上述の光学バリアフィルム20A,20B,20C,20Dのいずれであってもよく、二つの光学バリアフィルム20の構成は互いに同じであっても異なっていてもよい。光学バリアフィルム20は、コーティング層14が色変換層32と反対側を向くように色変換層32上に配置されている。したがって、色変換フィルム30はコーティング層14の凹凸面14Aに由来する凹凸面20F,20Gを有する。上述のとおり、光学バリアフィルム20が備えるコーティング層14に含まれる微粒子の粒子径のバラツキが十分に小さいため、色変換フィルム30の性能のバラツキも十分に小さくすることができる。
図7は本開示の一実施形態に係るバックライトユニットの概略断面図である。図7において、バックライトユニット40は、光源42と、導光板46と、導光板46上に配置された色変換フィルム30とを備える。色変換フィルム30は、凹凸面20F(すなわち、コーティング層14の凹凸面14A)が導光板46と接するように配置されている。詳細には、バックライトユニット40は、色変換フィルム30の凹凸面20F上に導光板46及び反射板44がこの順で配置され、光源42は上記導光板46の側方(導光板46の面方向)に配置される。バックライトユニット40は、性能の面内バラツキが十分に小さい色変換フィルム30を備えるため、バックライトユニット40の性能(発色、輝度等)のバラツキも十分に小さくすることができる。バックライトユニット40は、色変換フィルム30が接する導光板46が傷付くことを抑制することができる。また、バリア層自身が傷付くことも抑制されることから、色変換層に空気及び水蒸気の侵入が適切に低減されて、バックライトユニットから長期間に亘って良好な白色光を得ることができる。
実施例1~5及び比較例1のコーティング層組成物(塗液)を調製するため、以下の成分を準備した。
・主剤1:ウレタン系微粒子(平均粒子径6.20μm、粒子径の標準偏差2.25μm)とクリア剤の混合剤(DICグラフィックス株式会社製)
・主剤2:ウレタン系微粒子(平均粒子径7.46μm、粒子径の標準偏差13.39μm)とクリア剤の混合剤(DICグラフィックス株式会社製)
・クリア剤:主剤1,2の微粒子濃度を調整するためのニス(DICグラフィックス株式会社製)
・硬化剤:イソシアネート硬化剤(DICグラフィックス株式会社製)
・帯電防止剤:レジスタットPU-101(商品名、第一工業製薬株式会社製)
・溶剤:トルエン(和光純薬工業株式会社製、鹿1級)
主剤1,2に含まれる微粒子の「平均粒子径」及び「粒子径の標準偏差」を以下のようにして測定した。すなわち、主剤をガラス瓶に入れ、100回振とうした後、酢酸エチルを添加した。これによって得られた試料に含まれる微粒子の平均粒子径及び粒子径の標準偏差をレーザー回折・散乱式粒子径分布測定装置(日機装株式会社、マイクロトラックMT3300(商品名))を使用して測定した。表1に結果を示す。
第一フィルム基材上に、表2に示す組成を混合してなるコーティング層組成物を塗布し、ワイヤーバーコーターによって塗膜を形成した。続いて、この塗膜を80℃30秒間加熱して、塗膜を乾燥させた。この乾燥した塗膜に対して、60℃2日間エージングを行って、実施例1~5及び比較例1の光学フィルムをそれぞれ作製した。実施例1~5においては、コーティング層組成物の塗膜を形成するにあたり、番手の異なるワイヤーバーをそれぞれ使用することによって塗布量を変え、これにより、厚さの異なるコーティング層を第一フィルム基材上にそれぞれ形成した。
実施例及び比較例に係る光学フィルムのヘイズ及び全光線透過率は、ヘイズメータ(濁度計)NDH-2000(商品名、日本電色工業株式会社製)を用いて測定した。
実施例及び比較例で得られた光学フィルムを4cm×4cmの大きさに切り取り、切り取った光学フィルムのコーティング層とポリカーボネートフィルムとを互いに接するように重ね、室温で25kgf/cm2の荷重下で30秒間放置した。その後、光学フィルムとポリカーボネートフィルムとを目視及び顕微鏡によって観察して、下記基準に従って傷付け防止性を評価した。なお、ポリカーボネートフィルムは、バックライトユニットの導光板を模して用意した。ポリカーボネートフィルムの厚みは188μmであった。
A:光学フィルムのコーティング層及びポリカーボネートフィルムに傷が認められない。
B:光学フィルムのコーティング層及びポリカーボネートフィルムの少なくとも一方に傷が認められる。
C:光学フィルムのコーティング層及びポリカーボネートフィルムの少なくとも一方に傷が顕著に認められる。
実施例及び比較例で得られた光学フィルムのコーティング層の表面について、高抵抗抵抗率計(商品名:ハイレスターUP MCP-HT450、ダイアインスツルメンツ社製)を用い、JIS-K6911に準拠して表面抵抗率を測定した(印加電圧:500V、時間:10秒、プローブ:URSの条件、23℃55%RH環境下)。
実施例2及び比較例1の光学フィルムを100mm角にそれぞれ切り取った試料を準備した。これらの試料の中央と四隅付近の計5ヶ所(測定点1~5)についてそれぞれヘイズを測定した。これらの測定値からヘイズの平均値及びヘイズの標準偏差を算出した。表4に結果を示す。
実施例2及び比較例1に係る光学フィルムのコーティング層に含まれる微粒子の「平均粒子径」及び「粒子径の標準偏差」を以下のようにして測定した。すなわち、実施例2及び比較例1に係る光学フィルムを光学顕微鏡で1000倍に拡大し(図8(a)参照)、ランダムに抽出した50個の微粒子の直径を測定した。図8(b)に示すように、横方向の長さ(X)と縦方向の長さ(Y)をそれぞれ測定し、その平均値(=(X+Y)/2)を対象粒子の直径とした。表5にこれらの測定値から算出した微粒子の「平均粒子径」及び「粒子径の標準偏差」の値を示す。なお、図8(a)は実施例2に係る光学フィルムのコーティング層を光学顕微鏡で拡大して示す画像であり、図8(b)は図8(a)において丸で囲った粒子をさらに拡大して示す画像である。
実施例2及び比較例1に係る光学フィルムのコーティング層の算術平均粗さRaを測定した。測定には非接触表面層断面計測システム(バートスキャン、株式会社菱化システム製)を使用した。その結果は以下のとおりであった。
・実施例2:0.27μm
・比較例1:0.42μm
実施例2に係る光学フィルムのコーティング層の表面をコーティング層同士で擦る処理を行った後、当該表面を光学顕微鏡で拡大し、画像内において、上記処理によって微粒子が削られたと認められる箇所をカウントしたところ、そのような箇所が8箇所あった。当該箇所の横方向の長さ(X)と縦方向の長さ(Y)をそれぞれ測定し(図9参照)、その平均値(=(X+Y)/2)を削られている部分の直径とし、それぞれの箇所の面積を算出した。表6に結果を示す。
幅210mmの第一フィルム基材上に、表8に示す組成を混合してなるコーティング層組成物を塗布し、ワイヤーバーコーターによって長さ300mmにわたって塗膜を形成した。続いて、この塗膜を80℃30秒間加熱して、塗膜を乾燥させた。この乾燥した塗膜に対して、60℃2日間エージングを行って、実施例6及び比較例2の光学フィルムをそれぞれ作製した。実施例6及び比較例2において、第一フィルム基材上に形成されたコーティング層の厚さはいずれも、3μmであった。なお、実施例6では実施例1~5と同じ成分を使用し、比較例2では比較例1と同じ成分を使用した。
Claims (10)
- 第一フィルム基材と、
前記第一フィルム基材上に形成されたコーティング層と、
を備え、
前記コーティング層は、バインダー樹脂と、平均粒子径が0.5μm以上10.0μm以下であり且つ粒子径の標準偏差が平均粒子径の1/2未満である微粒子とを含む、光学フィルム。 - 前記コーティング層の算術平均粗さRaが0.4μm以下である、請求項1に記載の光学フィルム。
- 前記コーティング層の硬さが、鉛筆硬度でH~2Hの範囲である、請求項1又は2に記載の光学フィルム。
- 前記微粒子の硬さが、ロックウェルR硬さスケールで100以下である、請求項1~3のいずれか一項に記載の光学フィルム。
- 前記コーティング層の表面抵抗率が1.0×1013Ω/□以下である、請求項1~4のいずれか一項に記載の光学フィルム。
- バリア層と、
請求項1~5のいずれか一項に記載の光学フィルムと、
を備え、
前記バリア層は、前記光学フィルムの前記第一フィルム基材側の面上に形成されている、光学バリアフィルム。 - 第二フィルム基材及びバリア層を含むバリア複合層と、
請求項1~5のいずれか一項に記載の光学フィルムと、
を備え、
前記バリア複合層は、前記光学フィルムの前記第一フィルム基材側の面上に形成されている、光学バリアフィルム。 - 前記バリア層は、SiOx(1.0≦x≦2.0)で表されるシリコン酸化物からなる無機蒸着薄膜層を含む、請求項6又は7に記載の光学バリアフィルム。
- 色変換層と、
前記色変換層を挟むように配置された二つの保護フィルムと、
を備え、
前記二つの保護フィルムの少なくとも一方が、請求項6~8のいずれか一項に記載の光学バリアフィルムであり、
前記光学バリアフィルムは、前記コーティング層が前記色変換層と反対側を向くように配置されている色変換フィルム。 - 光源と、
導光板と、
前記導光板上に配置された請求項9に記載の色変換フィルムと、
を備え、
前記色変換フィルムは、前記コーティング層が前記導光板と接するように配置されている、バックライトユニット。
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JP2018554837A JPWO2018105213A1 (ja) | 2016-12-06 | 2017-10-02 | 光学フィルム、並びに、それを用いた光学バリアフィルム、色変換フィルム及びバックライトユニット |
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KR20190090833A (ko) | 2019-08-02 |
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