WO2017131030A1 - エッジライト型バックライト用反射フィルム及びそれを用いた液晶ディスプレイ用バックライト - Google Patents

エッジライト型バックライト用反射フィルム及びそれを用いた液晶ディスプレイ用バックライト Download PDF

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Publication number
WO2017131030A1
WO2017131030A1 PCT/JP2017/002543 JP2017002543W WO2017131030A1 WO 2017131030 A1 WO2017131030 A1 WO 2017131030A1 JP 2017002543 W JP2017002543 W JP 2017002543W WO 2017131030 A1 WO2017131030 A1 WO 2017131030A1
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Prior art keywords
particle
particles
reflective film
manufactured
containing layer
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PCT/JP2017/002543
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English (en)
French (fr)
Japanese (ja)
Inventor
若原隆一
新開啓令
坂口善彦
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東レ株式会社
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Priority to KR1020187018071A priority Critical patent/KR20180108575A/ko
Priority to CN201780006732.3A priority patent/CN108463748A/zh
Priority to JP2017504844A priority patent/JPWO2017131030A1/ja
Publication of WO2017131030A1 publication Critical patent/WO2017131030A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/02—Synthetic macromolecular particles
    • B32B2264/0214—Particles made of materials belonging to B32B27/00
    • B32B2264/0264—Polyamide particles

Definitions

  • the present invention relates to a reflective film for reducing luminance unevenness of an edge light type liquid crystal backlight, and in particular, to reduce damage on the surface of the reflective film (surface shaving of the reflective film) caused by rubbing between the light guide plate and the reflective film.
  • the present invention relates to a reflective film excellent in light resistance and a backlight for a liquid crystal display using the same.
  • the liquid crystal display device generally employs a backlight system that emits light by illuminating the liquid crystal layer from the back.
  • a backlight system that emits light by illuminating the liquid crystal layer from the back.
  • an edge light type and a direct type are known.
  • a bead layer containing particles (also referred to as a particle-containing layer or a coating layer) is laminated on at least one surface of a white film, and convex portions (projections) due to particles are formed on the surface.
  • a formed reflective film is known.
  • Patent Documents 1 to 4 For example, in order to improve the luminance of the backlight and suppress luminance unevenness, a bead layer in which the particle coverage, the number of particles stacked, the height of protrusions, the number of protruding particles, and the like have been proposed (for example, Patent Documents 1 to 4). 4).
  • the spherical particles contained in the particle-containing layer of the reflective film have at least two inflection points in the compression displacement curve and 50% or more of the particle diameter.
  • An edge-light-type reflective film for a backlight having a particle-containing layer containing spherical particles on at least one surface of the substrate film and satisfying the following (i) and (ii).
  • the compression displacement curve of the spherical particles has at least two inflection points, a first inflection point and a second inflection point.
  • having a second inflection point in the range of a displacement rate of 50% or more of the particle diameter in the compression displacement curve (2) having a particle-containing layer containing amorphous particles on at least one side of the base film.
  • an edge light type backlight reflecting film satisfying the following (i) to (iii).
  • the sphericity S of the amorphous particles is 0.65 ⁇ S ⁇ 0.80.
  • the gloss change before and after the surface friction test of the particle-containing layer is 10 or less.
  • the surface convex portion height of the particle-containing layer is 20 to 60 ⁇ m.
  • the 50% compressive strength of the spherical particles or irregular particles is 30 MPa or less.
  • Reflective film for edge light type backlight is (4) The reflective film for an edge light type backlight according to (2) or (3), wherein the amorphous particles include nylon 6.
  • a backlight for a liquid crystal display including the reflective film for an edge light type backlight according to any one of (1) to (5).
  • the edge light type backlight of the present invention is characterized by being configured using the reflective film, and is disposed so that the convex portion of the reflective film surface faces the light guide plate surface side, and a light emitting diode is provided.
  • a light source is preferable.
  • the present invention it is possible to provide a reflective film that can improve luminance unevenness in an edge light type backlight and can particularly effectively reduce surface abrasion of the reflective film.
  • the present invention has intensively studied a reflection film that can improve luminance unevenness in an edge-light type backlight and that can effectively reduce surface abrasion of the reflection film, and compressive displacement of spherical particles contained in a particle-containing layer in the reflection film. It has been clarified that the above problem can be solved when the number of inflection points of the curve and the displacement rate at which the inflection points occur satisfy a specific condition.
  • the surface shaving of the reflective film according to the present invention means that when the light guide plate and the reflective film rub against each other, the particles in the particle-containing layer are damaged and generate dust.
  • the white spot unevenness related to the present invention means unevenness in which the pressurizing part becomes a bright part by visual observation when the backlight is turned on because local pressure is applied to the light guide plate and the reflective film.
  • the luminance unevenness according to the present invention is uneven adhesion between the light guide plate and the reflective film that is visually observed when the backlight is turned on, and means the unevenness described below.
  • Striped unevenness ii
  • Puddle-shaped unevenness iii
  • the shaving of the light guide plate according to the present invention means that a part or all of convex portions (for example, printing dots formed by screen printing) formed on the surface of the light guide plate facing the reflective film drop off or scratch on the convex portion surface. It means that scratches occur.
  • convex portions for example, printing dots formed by screen printing
  • the particle-containing layer according to the present invention includes at least granular particles or amorphous particles and a binder resin. Moreover, various additives can be added within the range which does not inhibit the effect of this invention.
  • the particle-containing layer may have a convex portion on the surface thereof (hereinafter, the convex portion may be referred to as a surface convex portion).
  • the convex portion may be formed by particles contained in the particle-containing layer, or may be formed by others.
  • the method for forming the particle-containing layer according to the present invention is not particularly limited, but an appropriate binder resin and spherical particles or amorphous particles are mixed in an appropriate solvent, applied to a substrate film, and then dried. By this, the method etc. which form a particle content layer on the substrate film surface are mentioned.
  • the spherical particles according to the present invention refer to particles having a sphericity S of 0.80 or more.
  • the sphericity S is expressed by an area ratio between the area of the minimum circumscribed circle and the particle cross section when the minimum circle circumscribing the particle cross section is described in the cross-sectional photograph of the particle in the reflective film. Area) / (area of the minimum circumscribed circle).
  • the cross-sectional shape of the particles is observed as follows.
  • the center of gravity of the particles was cut in a direction perpendicular to the plane of the reflective film at a knife inclination angle of 3 ° using a rotary microtome manufactured by Nippon Microtome Research Institute.
  • the cross section of the reflection film thus obtained is observed with a scanning electron microscope (S-3400N manufactured by Hitachi, Ltd.) (500 to 1,000 times).
  • S-3400N manufactured by Hitachi, Ltd.
  • Arbitrary 10 points are measured, the sphericity S is calculated for each, and the average value is defined as “sphericity S”. If the sphericity S is 0.80 or more, it is determined that the reflective film contains spherical particles.
  • the compression displacement curve of the spherical particles contained in the particle-containing layer according to the present invention has at least two inflection points, a first inflection point and a second inflection point, and a displacement rate of 50% or more of the particle diameter.
  • the second inflection point is in the range of. When the number of inflection points is one or less, the elastic deformation is not sufficient and the particles may be crushed. Even when the second inflection point exists within the range of the displacement rate of less than 50% of the particle diameter, the breaking energy is small and the particles are likely to break up, so that in any case, the surface of the reflective film tends to be scraped.
  • the compression displacement curve of the spherical particles contained in the particle-containing layer according to the present invention only needs to have at least two inflection points, and may have two inflection points, or three or more. May have inflection points.
  • the first inflection point and the second inflection point in the range of the displacement rate of 50% or more of the particle diameter, and further the displacement rate of 50% or more of the particle diameter.
  • the case where it has a 3rd inflection point in the range of is mentioned. The measurement was performed as follows.
  • FIG. 1 shows an example of a compression displacement curve.
  • the y-axis is the load (unit: mN)
  • a compression displacement curve is created.
  • the data sampling rate is 0.05 s.
  • (v) Second inflection point The slope D2 of the linear approximation line L2 in the data range where the displacement rate is 25% or more and 35% or less and the slope D3 of the linear approximation line L3 in the data range where the displacement rate is 60% or more and 70% or less.
  • the difference (D3-D2) is 0.8 or more, it is defined that the second inflection point exists, a perpendicular line is drawn from the intersection of L2 and L3 in the direction of the compression displacement curve, and the intersection of the perpendicular and the compression displacement curve Is the second inflection point.
  • the second inflection point is defined as having the second inflection point within the range of the displacement rate of 50% or more of the particle diameter. The displacement rate at the point was determined.
  • the average particle size of the spherical particles contained in the particle-containing layer according to the present invention is preferably 15 to 80 ⁇ m, more preferably 20 to 60 ⁇ m, and most preferably 25 to 40 ⁇ m.
  • the thickness is less than 15 ⁇ m, the luminance unevenness in the edge light type backlight may be increased, and when it is larger than 80 ⁇ m, the productivity may be reduced due to particle dropping or sedimentation in the coating material.
  • the average particle diameter of the spherical particles is the square or rectangle with the smallest area completely surrounding the spherical particles on the cross-sectional photograph observed with a scanning electron microscope (Hitachi, Ltd. S-3400N). In the case of a length of one side or a rectangle, the length of the long side was taken as the particle diameter. Details are described in the Examples section.
  • the height of the surface convex portion in the particle-containing layer containing the spherical particles according to the present invention is preferably 15 to 80 ⁇ m, more preferably 20 to 60 ⁇ m, and most preferably 25 to 40 ⁇ m.
  • the luminance unevenness in the edge light type backlight may be large. If it is larger than 80 ⁇ m, the load applied to the light guide plate and the reflective film is likely to increase, and the light guide plate is likely to be damaged. There is a case.
  • FIG. 4 shows a schematic cross-sectional view of the particle-containing layer.
  • FIG. 4 shows an example in which the convex portion in the particle-containing layer is formed of particles.
  • the distance H is the height of the surface convex portion, and the average value of any 10 points is the “surface convex portion height”.
  • the number of surface protrusions in the particle-containing layer containing spherical particles according to the present invention is preferably 10 to 1,500 / mm 2 , more preferably 50 to 750 / mm 2 , and most preferably 80 to 300 / mm 2 . a mm 2.
  • protrusions number is less than 10 pieces / mm 2, the reflection film and the light guide plate is easily fit, may uneven brightness performance is lowered, 1,500 pieces / mm 2 If more than even the light guide plate reflection Since the contact point of the film increases, the luminance unevenness performance may deteriorate. Details of the measurement of the number of surface protrusions in the particle-containing layer will be described in the Examples section.
  • composition of spherical particles and irregular particles is not particularly limited as long as the compression displacement curve of the spherical particles satisfies the conditions, and any of organic and inorganic types can be used.
  • a preferred composition includes a composition containing an amorphous polyamide.
  • a non-fully aromatic polyamide is preferred, specifically, an aliphatic polyamide, an aromatic polyamide, and a polyamide having an alicyclic structure are preferred, and an alicyclic structure.
  • polyamides having an amorphous polyamide is preferred, specifically, an aliphatic polyamide, an aromatic polyamide, and a polyamide having an alicyclic structure are preferred, and an alicyclic structure.
  • amorphous polyamide a copolymer of 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane, isophthalic acid and 12-aminododecanoic acid represented by the following general formula (1) (for example, “Grillamide” (registered trademark) TR55, manufactured by Mzavelke), a copolymer of 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane and dodecadioic acid represented by the following general formula (2) ( For example, “Grillamide” (registered trademark) TR90, manufactured by Mzavelke), 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane represented by the following general formula (3), isophthalic acid and 12- A mixture of a copolymer of aminododecanoic acid and a copolymer of 3,3′-dimethyl-4,4′-diamin
  • FIG. 3 is a schematic diagram of the cross-sectional shape of the amorphous particles.
  • the cross-sectional area ratio is sphericity S
  • the sphericity S (particle cross-sectional area) / (minimum circumscribed circle area) obtained by the method described in the example section is 0.65 ⁇ S.
  • ⁇ 0.80 it is determined that amorphous particles are included. Details of the cross-sectional shape of the amorphous particles will be described in the Examples section.
  • the average particle diameter of the amorphous particles contained in the particle-containing layer according to the present invention is preferably 15 to 60 ⁇ m, more preferably 25 to 60 ⁇ m, and most preferably 30 to 60 ⁇ m.
  • the thickness is less than 15 ⁇ m, the luminance unevenness in the edge light type backlight may be increased, and when it is larger than 60 ⁇ m, the productivity may be reduced due to particle dropping or sedimentation in the coating material. Details of the measurement of the average particle diameter will be described in the Examples section.
  • the surface abrasion property is improved is that the number of particles in contact with the light guide plate varies moderately by using particles having a plurality of particle sizes.
  • the height of the surface convex portion in the particle-containing layer containing the amorphous particles according to the present invention is 20 to 60 ⁇ m, preferably 30 to 60 ⁇ m, and most preferably 45 to 60 ⁇ m.
  • the thickness is less than 20 ⁇ m, the luminance unevenness in the edge light type backlight may be increased.
  • the thickness is more than 60 ⁇ m, the load applied to the light guide plate and the reflective film is likely to increase, and the light guide plate is likely to be scraped. There is a case.
  • the number of surface protrusions in the particle-containing layer containing irregularly shaped particles according to the present invention is preferably 10 to 1,500 / mm 2 , more preferably 50 to 750 / mm 2 , and most preferably 80 to 300. / Mm 2 . If protrusions number is less than 10 pieces / mm 2, the reflection film and the light guide plate is easily fit, may uneven brightness performance is lowered, 1,500 pieces / mm 2 If more than even the light guide plate reflection Since the contact point of the film increases, the luminance unevenness performance may deteriorate. Details of the measurement of the number of surface protrusions in the particle-containing layer will be described in the Examples section.
  • the glossiness change before and after the surface friction test of the particle-containing layer according to the present invention is 10 or less. Preferably it is 7 or less, More preferably, it is 3 or less. When the change in glossiness is greater than 10, damage to the reflective film surface caused by rubbing between the light guide plate and the reflective film is large, and brightness unevenness may be reduced.
  • Gloss change before and after the surface friction test is evaluated by rubbing the surface of the particle-containing layer with a sandpaper (Sankyo Rika Paper No. 400) and comparing the gloss of the particle-containing layer surface before and after that.
  • a sandpaper Sudyo Rika Paper No. 400
  • composition of the irregular shaped particles according to the present invention preferably contains nylon 6. That is, the amorphous particles according to the present invention preferably contain nylon 6. Nylon 6 is preferable because the surface abrasion of the reflective film is better than that of nylon 12 or a copolymer of nylon 12 and nylon 6. Compared to nylon 12, or a copolymer of nylon 12 and nylon 6, nylon 6 has a large elastic modulus and maximum elongation, and particles are less likely to be crushed.
  • Binder resin composition Although it does not specifically limit as binder resin which comprises the particle
  • the particle-containing layer of the present invention contains an ultraviolet absorber and a light stabilizer.
  • Such ultraviolet absorbers and light stabilizers are roughly classified into inorganic and organic types, but are not particularly limited with respect to the form to be contained, such as being mixed with a binder resin that forms such a particle-containing layer.
  • the method may be used.
  • a method of copolymerizing the binder resin forming the particle-containing layer with the ultraviolet absorber and the light stabilizer is very much smaller.
  • titanium oxide, zinc oxide, cerium oxide and the like are generally known. Among them, at least one selected from the group consisting of zinc oxide, titanium oxide and cerium oxide does not bleed out and is preferably used from the viewpoints of economy, light resistance, ultraviolet absorption and photocatalytic activity. Such ultraviolet absorbers may be used in combination of several kinds as required. Of these, zinc oxide or titanium oxide is most preferable from the viewpoints of economy, ultraviolet absorption, and photocatalytic activity.
  • organic ultraviolet absorbers examples include benzotriazole and benzophenone.
  • benzotriazole can be suitably used because it contains nitrogen in the structure and thus has a function as a flame retardant, but is not particularly limited thereto. Since these ultraviolet absorbers only absorb ultraviolet rays and cannot capture organic radicals generated by ultraviolet irradiation, the base film may be chain-degraded by these radicals.
  • a light stabilizer is preferably used in combination.
  • a hindered amine (HALS) compound is preferably used as such a light stabilizer.
  • the copolymerization monomer for fixing the organic ultraviolet absorber and / or the light stabilizer vinyl monomers such as acrylic and styrene are highly versatile and economically preferable.
  • the styrene-based vinyl monomer has an aromatic ring and thus easily yellows. From the viewpoint of light resistance, copolymerization with an acrylic vinyl monomer is most preferably used.
  • benzotriazole 2- (2′-hydroxy-5′-methacryloxyethylphenyl) -2H-benzotriazole (trade name: RUVA-) is used in which a reactive vinyl monomer is substituted for the benzotriazole. 93); Otsuka Chemical Co., Ltd.) can be used. Also, in the case of hindered amine compounds, 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine (“ADK STAB LA-82”; manufactured by ADEKA Corporation) is used as a reactive vinyl monomer. ) Can be used.
  • ADK STAB LA-82 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine
  • the organic ultraviolet absorber includes a resin containing an organic ultraviolet absorber such as benzotriazole or benzophenone, a resin copolymerized with a benzotriazole-based or benzophenone-based reactive monomer, or a hindered amine.
  • an organic ultraviolet absorber such as benzotriazole or benzophenone
  • a resin copolymerized with a benzotriazole-based or benzophenone-based reactive monomer or a hindered amine.
  • a resin containing and / or copolymerizing a light stabilizer such as a (HALS) -based reactive monomer can be used within a range that does not impair the effects of the present invention.
  • Organic UV-absorbing resins containing a resin obtained by copolymerizing such benzotriazole-based and benzophenone-based reactive monomers, and further a resin copolymerized with a hindered amine (HALS) -based reactive monomer are thin and have a high UV-absorbing effect. More preferred. Of these, benzotriazole is particularly preferred because it contains nitrogen in the structure and also has a function as a flame retardant.
  • base film When the base film according to the present invention is used as a reflective film for a backlight, the higher the visible light reflectance, the better.
  • a film containing bubbles and / or incompatible particles therein is preferably used.
  • These base films are not limited, but are preferably used as examples of polyolefin-based or polyester-based such as porous unstretched or biaxially stretched polypropylene film, porous unstretched or stretched polyethylene terephthalate film, etc.
  • polyesters are preferably used from the viewpoint of moldability and productivity.
  • JP-A-8-262208 paragraphs [0007] to [0018] of JP-A-2002-90515, and JP-A-2002-138150. Details are disclosed in paragraphs [0008] to [0034].
  • the porous white biaxially stretched polyethylene terephthalate film disclosed in JP-A-2002-90515 can be preferably used as the base film according to the present invention for the reasons described above.
  • a porous white biaxially stretched polyethylene terephthalate film mixed and / or copolymerized with polyethylene naphthalate can be used from the viewpoints of heat resistance and reflectance.
  • a porous white biaxially stretched polyethylene terephthalate film containing inorganic particles can be used in order to improve the flame retardancy of the porous white biaxially stretched polyethylene terephthalate film itself.
  • the content of the inorganic particles contained in the base film is preferably 2% by mass or more, more preferably 7% by mass or more, and most preferably 30% by mass or more with respect to the total mass of the base film. is there.
  • the structure of the substrate film according to the present invention may be appropriately selected depending on the intended use and required characteristics, and is not particularly limited, but is a single layer having at least one layer and / or two or more layers.
  • the composite film is preferable, and it is preferable that at least one layer thereof contains bubbles and / or inorganic particles.
  • Examples of the single layer configuration include, for example, a base film having only a single A layer, and the A layer includes inorganic particles and / or bubbles.
  • the content of the inorganic particles is preferably 2% by mass or more, more preferably 7% by mass or more, and most preferably 10% by mass or more with respect to the total mass of the base thermoplastic resin film.
  • An example of a two-layer structure is a base film having a two-layer structure of A layer / B layer in which a B layer is laminated on the A layer, and at least one of these A and B layers is inorganic.
  • grains and / or air bubbles is mentioned.
  • the content of the inorganic particles is preferably 2% by mass or more, more preferably 7% by mass or more, and most preferably 30% by mass or more based on the total mass of the base film, that is, the total mass of the two layers. .
  • the thing of the structure which contained the inorganic particle and / or the bubble in at least 1 layer of each layer is mentioned.
  • the content of the inorganic particles is preferably 2% by mass or more, more preferably 7% by mass or more, and further preferably 30% by mass or more with respect to the total mass of the base film.
  • the B layer is most preferably a layer containing bubbles from the viewpoint of productivity.
  • the number average particle diameter of the inorganic particles contained in the base film is preferably 0.3 to 2.0 ⁇ m.
  • examples of the inorganic particles include calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, silica, alumina, mica, titanium mica, talc, clay, Kaolin, lithium fluoride, calcium fluoride, or the like can be used.
  • polymethylpentene is added as an incompatible polymer, and polyethylene glycol, polybutylene terephthalate and polytetramethylene glycol copolymer as a low specific gravity agent are added into polyethylene terephthalate.
  • the mixture is sufficiently mixed and dried, and then supplied to the extruder B heated to a temperature of 270 to 300 ° C.
  • Polyethylene terephthalate containing inorganic and / or organic additives such as BaSO 4 , CaCO 3 and TiO 2 is supplied to the extruder A by a conventional method.
  • the polymer of the extruder B is arranged on the inner layer (B layer), and the polymer of the extruder A is arranged on both surface layers (A layer), so that A layer / B layer / A layer Laminated in three layers of the structure.
  • the melt-laminated sheet is closely cooled and solidified by electrostatic force on a drum cooled to a drum surface temperature of 10 to 60 ° C. to obtain an unstretched film.
  • the unstretched film is guided to a roll group heated to 80 to 120 ° C., longitudinally stretched 2.0 to 5.0 times in the longitudinal direction, and cooled with a roll group of 20 to 50 ° C. Subsequently, the film is stretched in the direction perpendicular to the longitudinal direction in an atmosphere heated to 90 to 140 ° C. while being guided to a tenter while holding both ends of the longitudinally stretched film with clips.
  • the stretching ratio is 2.5 to 4.5 times in the longitudinal and lateral directions
  • the area ratio (longitudinal stretching ratio ⁇ lateral stretching ratio) is preferably 9 to 16 times. That is, when the area magnification is less than 9, the whiteness of the resulting film may be poor. On the other hand, if the area magnification exceeds 16 times, the film tends to be broken at the time of stretching and the film forming property may be poor.
  • the film is heat-set at 150 to 230 ° C. in a tenter, uniformly cooled, and further cooled to room temperature. The substrate film according to the present invention is obtained.
  • a white film having a single layer structure As an example of such a base film, first, as a white film having a single layer structure, “Lumirror” (registered trademark) E20 (manufactured by Toray Industries, Inc.), SY64, SY74 (manufactured by SKC) and the like can be cited Examples of the white film having the structure include “Tetron” (registered trademark) film UXZ1, UXSP (manufactured by Teijin DuPont Films).
  • Examples of the white film having a three-layer structure include “Lumorer” (registered trademark) E6SL, E6SR, E6SQ, E85D “Tetron” (registered trademark) film UX, UXH (manufactured by Teijin DuPont Films).
  • the organic solvent used for forming such a particle-containing layer means an organic compound having a property of dissolving a substance.
  • aromatic hydrocarbons such as toluene, xylene and styrene, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, alcohols such as methanol, isopropyl alcohol and isobutyl alcohol, chlorobenzene and orthodichloro Chlorinated aromatic hydrocarbons such as benzene, methane derivatives such as monochloromethane, chlorinated aliphatic hydrocarbons containing ethane derivatives such as monochloroethane, esters such as methyl acetate, ethyl acetate, butyl acetate, ethyl ether, 1 Ethers such as 1,4-dioxane, glycol ethers
  • methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, and butyl acetate are preferable.
  • the particle-containing layer when it is formed on at least one surface of the base film, it can be formed by any method. For example, gravure coating, roll coating, spin coating, reverse coating, reverse kiss coating, bar coating, screen coating, blade coating, air knife coating, slit die coating, lip coating, dipping, etc.
  • finish of crystal orientation etc. are mentioned.
  • reverse kiss coating can be most preferably used.
  • additives can be added to the base film and the particle-containing layer as long as the effects of the present invention are not impaired.
  • additives include organic and / or inorganic fine particles, fluorescent brighteners, crosslinking agents, heat stabilizers, oxidation stabilizers, organic lubricants, antistatic agents, nucleating agents, dyes, fillers, and dispersions.
  • An agent, a flame retardant, a coupling agent and the like can be added and blended.
  • the reflective film of the present invention thus obtained can be suitably used for an edge light type liquid crystal display backlight and an illumination surface light source.
  • the particle diameter referred to here is a square or rectangle having the smallest area that completely surrounds one particle in a plan view on the observation photograph (that is, a square or rectangle in which the ends of the particles are in contact with four sides). In the case of a rectangle, the length of a long side (major axis diameter) is used.
  • MCTW-500 manufactured by Shimadzu Corporation
  • the length of the long side was defined as the particle diameter (that is, the longest constant tangential diameter was defined as the particle diameter).
  • Arbitrary 30 points were measured, and an average value was calculated to obtain an “average particle size”.
  • the distance between the base film surface and the highest point of the convex surface (vertex of the convex portion) on the cross-sectional photograph is the height of the convex surface of the surface, and the average value of the measurement results of any 10 points is expressed as “surface convexity height ""
  • Number of surface convex portions of particle-containing layer The number of surface convex portions of the particle-containing layer is determined using a laser microscope VK-9700 manufactured by Keyence Corporation. A sample is observed with the magnification of the objective lens set to 50 times, and a portion detected at a height of 1 ⁇ m or more is counted as a convex portion. Arbitrary 10 points were measured, and the measurement result was converted to the number of convex portions per 1 mm 2 to obtain “the number of convex portions on the surface”.
  • the surface friction test was performed by rubbing the surface of the particle-containing layer with a sandpaper (Sankyo Rika Paper Co., Ltd. paper # 400). The surface of the particle-containing layer and the sandpaper surface of the sandpaper were made to face each other, a load of 500 g was applied, and the sandpaper was reciprocated 5 times at a speed of 10 cm / second.
  • the pressurizing area was a circle with a diameter of 20 mm, and was pressed using a stainless steel flat plate.
  • Gloss measurement Gloss meter GM-1 (manufactured by Suga Test Instruments Co., Ltd.) was used for gloss measurement. The measurement was performed so that the direction in which the sandpaper was reciprocated and the direction of the gloss measurement were perpendicular. The direction of glossiness measurement is the direction of a straight line connecting the light source and the light receiving unit. The glossiness measured after surface friction was subtracted from the glossiness measured before surface friction. Three samples were measured for each level, and the average value was defined as the change in gloss before and after the surface friction test.
  • FIG. 5 is a schematic side view of the evaluation method, and the evaluation was performed according to the following procedures (i) to (iii).
  • the reflective film 23 was taken out, and the particle-containing layer was observed with a laser microscope (Laser microscope VK-9710 manufactured by Keyence Co., Ltd.) at a magnification of the objective lens of 50 times and a display magnification of 100%.
  • the observation area is 200 ⁇ m ⁇ 300 ⁇ m.
  • the degree of surface abrasion of the reflective film was observed and evaluated according to the following criteria. Class A: Most particles are not damaged. Class B: Some particles are slightly damaged, but at an acceptable level. Class C: Many of the particles are damaged and at an unacceptable level.
  • Example and Comparative Example cut in place of the mounted reflective film and the reflective film were placed so that the surface provided with the convex portion faces the light guide plate side, and the light guide plate and the three optical films were the same as before disassembly Installed in the direction and direction. Moreover, the presence or absence of luminance unevenness was visually determined as follows. A: The luminance unevenness cannot be visually recognized from any angle. B: Brightness unevenness is visually recognized at any angle.
  • Class B 250 gf / cm 2 of but scratches is observed under load, not seen wounds under a load of 150 gf / cm 2 load and under 50 gf / cm 2.
  • Class C Scratches are observed under a load of 150 gf / cm 2 .
  • Examples and Comparative Examples The particles A used in Examples 1 to 3 were prepared by the following procedure.
  • amorphous polyamide (“Grillamide” (registered trademark) TR55 manufactured by Mzavelke) as polymer A, 450 g of N-methyl-2-pyrrolidone as organic solvent, and 250 g of polyvinyl alcohol as polymer B (Nippon Synthetic Chemical Industry Co., Ltd. “GOHSENOL” (registered trademark) GL-05) was added, heated to 80 ° C., and stirred until the polymer was dissolved. After returning the temperature of the system to room temperature, 500 g of ion-exchanged water as a poor solvent was dropped at a speed of 4.2 g / min via a liquid feed pump while stirring at 400 rpm.
  • Example 1 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, particles A: 0.1 g were added with stirring to prepare a coating solution.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • particles A 0.1 g were added with stirring to prepare a coating solution.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24. A particle-containing layer was provided under a drying condition of minutes. In addition, the sphericity S of the particle
  • Example 2 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, particles A: 0.5 g were added with stirring to prepare a coating solution.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • particles A 0.5 g were added with stirring to prepare a coating solution.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24. A particle-containing layer was provided under a drying condition of minutes. In addition, the sphericity S of the particle
  • Example 3 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, particles A: 5.0 g were added while stirring to prepare a coating solution.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • particles A 5.0 g were added while stirring to prepare a coating solution.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24. A particle-containing layer was provided under a drying condition of minutes. In addition, the sphericity S of the particles in Example 3 was 0.80 or more, and it was determined that spherical particles were included.
  • Example 4 The particle B used in Example 4 was prepared in the same manner as the spherical particle A by appropriately adjusting the granulation conditions by using “Grillamide” (registered trademark) TR30 (polyamide having an alicyclic structure) manufactured by Mzavelke as the polymer A. Created with.
  • Grillamide registered trademark
  • TR30 polyamide having an alicyclic structure
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • particles A 0.5 g were added with stirring to prepare a coating solution.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24. A particle-containing layer was provided under a drying condition of minutes. In addition, the sphericity S of the particle
  • the coating solution was prepared by applying Metavar # 24 on one side of a 300 ⁇ m porous biaxially oriented polyethylene terephthalate white film (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.).
  • the particle-containing layer was provided under drying conditions at 120 ° C. for 1 minute, and the sphericity S of the particles in Comparative Example 1 was 0.80 or more Ri, was determined to contain spherical particles.
  • the coating solution was prepared by applying Metavar # 24 on one side of a 300 ⁇ m porous biaxially oriented polyethylene terephthalate white film (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.).
  • the particle-containing layer was provided under drying conditions at 120 ° C. for 1 minute, and the sphericity S of the particles in Comparative Example 2 was 0.80 or more. It was determined to contain spherical particles.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • nylon 6 resin particles TR-1 manufactured by Toray Industries, Inc.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • grains in the comparative example 3 was 0.80 or more, and it was judged that a spherical particle was included.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • grains in the comparative example 4 was 0.80 or more, and it was judged that a spherical particle was included.
  • Example 5 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 D NAT 1 (manufactured by Arkema, 50% compressive strength 18 MPa): 2.1 g was added with stirring. A coating solution was prepared.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 6 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 D NAT 1 (manufactured by Arkema): 1.5 g added with stirring did.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 7 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 D NAT 1 (manufactured by Arkema Co., Ltd.): 0.3 g is added with stirring to prepare a coating solution. did.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 8 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 D NAT 1 (manufactured by Arkema Co., Ltd.): 0.2 g is added with stirring to prepare a coating liquid. did.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 9 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema, 50% compression strength 21 MPa): 2.2 g was added with stirring. A coating liquid was prepared.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 10 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema Co., Ltd.): 1.5 g added with stirring Got ready.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 11 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema): 0.3 g added with stirring Got ready.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 12 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.): 4.75 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g, ethyl acetate: 3.85 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema): 0.2 g added with stirring Got ready.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 13 “HALS HYBRID” (registered trademark) UV-G720T (acrylic copolymer, 40% by weight solution, manufactured by Nippon Shokubai Co., Ltd.): 3.60 g, Duranate 24A-100 (isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.18 g, ethyl acetate: 5.62 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema): 0.46 g, “Orgasol” (registered trademark) 1002 D NAT 1 (manufactured by Arkema Co., Ltd.): A coating solution was prepared by adding 0.14 g with stirring.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 14 “Pesresin” (registered trademark) S-680EA (aromatic polyester resin, ethyl acetate solution having a concentration of 45% by mass, number average molecular weight 3,000, manufactured by Takamatsu Yushi Co., Ltd.): 3.20 g, Duranate 24A-100 ( Isocyanate-based crosslinking agent, manufactured by Asahi Kasei Chemicals Corporation: 0.18 g, ethyl acetate: 6.03 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema Inc.): 0.46 g, “Orgasol "(Registered trademark) 1002 D NAT 1 (manufactured by Arkema Co., Ltd.): A coating solution was prepared by adding 0.13 g with stirring.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 15 “Pesresin” (registered trademark) S-180EA (aromatic polyester resin, 30% by weight ethyl acetate solution, number average molecular weight 15,000, manufactured by Takamatsu Yushi Co., Ltd.): 4.93 g, Duranate 24A-100 ( Isocyanate-based crosslinking agent, manufactured by Asahi Kasei Chemicals Corporation: 0.18 g, ethyl acetate: 4.30 g, “Orgasol” (registered trademark) 1002 ES 5 NAT 1 (manufactured by Arkema): 0.46 g, “Orgasol "(Registered trademark) 1002 D NAT 1 (manufactured by Arkema Co., Ltd.): A coating solution was prepared by adding 0.13 g with stirring.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 30.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • Example 16 The particles C used in Example 16 were prepared by the following procedure. In a 1000 ml four-necked flask, 25 g of amorphous polyamide ("Grillamide” (registered trademark) TR55 manufactured by Mzavelke) as polymer A and 450 g of dimethyl sulfoxide as an organic solvent are added and heated to 120 ° C until the polymer is dissolved. Stirring was performed. After returning the temperature of the system to room temperature at a rate of 5 ° C./10 minutes, 3000 g of ion-exchanged water was added. The obtained suspension was filtered, washed with 1,000 g of ion-exchanged water, and vacuum-dried at 80 ° C. for 10 hours to obtain 23.7 g of a white solid.
  • Grillamide registered trademark
  • TR55 dimethyl sulfoxide
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • particles C 0.3 g were added with stirring to prepare a coating solution.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • nylon 6 resin particles TR-1 manufactured by Toray Industries, Inc.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was not in the range of 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles did not contain amorphous particles and contained true spherical particles.
  • the particle compression displacement curve does not have the second inflection point.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 44. A particle-containing layer was provided under a drying condition of minutes. In Comparative Example 6, the sphericity S of the particles was 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles contained amorphous particles.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • nylon 12 resin particles SP-10, Toray Industries, Inc.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 18.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was not in the range of 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles did not include amorphous particles and included spheric particles.
  • the displacement rate at the second inflection point of the particle compression displacement curve is less than 50%.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, solution with a concentration of 40% by mass, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate-based crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 3.85 g
  • a coating solution was prepared.
  • This coating solution was applied to one side of a white film made of 300 ⁇ m porous biaxially stretched polyethylene terephthalate (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.) using Metabar # 24.
  • a particle-containing layer was provided under a drying condition of minutes.
  • the sphericity S of the particles was not in the range of 0.65 ⁇ S ⁇ 0.80, and it was determined that the particles did not include amorphous particles and included spheric particles.
  • the displacement rate at the second inflection point of the particle compression displacement curve is less than 50%.
  • HALS HYBRID registered trademark
  • UV-G720T acrylic copolymer, 40% by weight solution, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.11 g, ethyl acetate: 5.2 g
  • acrylic resin particles (“TECHPOLYMER” (registered trademark) MBX30X-30: 0.5 g, manufactured by Sekisui Plastics Co., Ltd.) are added with stirring.
  • the coating solution was prepared by applying Metavar # 24 on one side of a 300 ⁇ m porous biaxially oriented polyethylene terephthalate white film (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.). Then, the particle-containing layer was provided under drying conditions at 120 ° C. for 1 minute, where the sphericity S of the particles in Comparative Example 9 was 0.65 ⁇ S ⁇ . Not in the range of .80, free of irregular particles were determined to contain true spherical particles. Further, in Comparative Example 9, the compression displacement curve of the particles do not have an inflection point.
  • “HALS HYBRID” registered trademark
  • UV-G720T acrylic copolymer, 40% by weight solution, manufactured by Nippon Shokubai Co., Ltd.
  • Duranate 24A-100 isocyanate crosslinking agent, Asahi Kasei Chemicals ( Co., Ltd.): 0.19 g
  • ethyl acetate 5.2 g
  • acrylic resin particles (“TECHPOLYMER” (registered trademark) BMX30X-30: 0.5 g, manufactured by Sekisui Plastics Co., Ltd.) are added with stirring.
  • the coating solution was prepared by applying Metavar # 24 on one side of a 300 ⁇ m porous biaxially oriented polyethylene terephthalate white film (“Lumirror” (registered trademark) E6SQ manufactured by Toray Industries, Inc.).
  • the particle-containing layer was provided under drying conditions at 120 ° C. for 1 minute, and the sphericity S of the particles in Comparative Example 10 was 0.65 ⁇ S. Not in the range of 0.80, free of irregular particles were determined to contain true spherical particles. Further, in Comparative Example 10, a compression displacement curve of the particles do not have an inflection point.

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PCT/JP2017/002543 2016-01-26 2017-01-25 エッジライト型バックライト用反射フィルム及びそれを用いた液晶ディスプレイ用バックライト WO2017131030A1 (ja)

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CN201780006732.3A CN108463748A (zh) 2016-01-26 2017-01-25 边光型背光源用反射膜及使用其的液晶显示器用背光源
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JP2010065229A (ja) * 2009-12-15 2010-03-25 Mitsubishi Plastics Inc 蒸着用ポリエステルフィルム
JP2010102071A (ja) * 2008-10-23 2010-05-06 Toray Ind Inc 白色反射フィルム
JP2014126638A (ja) * 2012-12-26 2014-07-07 Toray Ind Inc 液晶ディスプレイ用反射フィルム
JP2014199330A (ja) * 2013-03-29 2014-10-23 富士フイルム株式会社 フィルムミラー及びそれを用いた太陽光反射板
WO2015020223A1 (ja) * 2013-08-07 2015-02-12 帝人デュポンフィルム株式会社 白色反射フィルム
WO2015146732A1 (ja) * 2014-03-27 2015-10-01 東レ株式会社 積層フィルム

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JP2010102071A (ja) * 2008-10-23 2010-05-06 Toray Ind Inc 白色反射フィルム
JP2010065229A (ja) * 2009-12-15 2010-03-25 Mitsubishi Plastics Inc 蒸着用ポリエステルフィルム
JP2014126638A (ja) * 2012-12-26 2014-07-07 Toray Ind Inc 液晶ディスプレイ用反射フィルム
JP2014199330A (ja) * 2013-03-29 2014-10-23 富士フイルム株式会社 フィルムミラー及びそれを用いた太陽光反射板
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