WO2015182448A1 - Film réfléchissant, et unité de rétroéclairage à éclairage périphérique utilisant ce film réfléchissant - Google Patents

Film réfléchissant, et unité de rétroéclairage à éclairage périphérique utilisant ce film réfléchissant Download PDF

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Publication number
WO2015182448A1
WO2015182448A1 PCT/JP2015/064424 JP2015064424W WO2015182448A1 WO 2015182448 A1 WO2015182448 A1 WO 2015182448A1 JP 2015064424 W JP2015064424 W JP 2015064424W WO 2015182448 A1 WO2015182448 A1 WO 2015182448A1
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Prior art keywords
particles
layer
mass
reflective film
resin layer
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PCT/JP2015/064424
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English (en)
Japanese (ja)
Inventor
田中正太郎
若原隆一
塚村裕介
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東レ株式会社
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Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to JP2015526797A priority Critical patent/JP6232063B2/ja
Priority to CN201580025454.7A priority patent/CN106461822B/zh
Priority to KR1020167031175A priority patent/KR20170012219A/ko
Publication of WO2015182448A1 publication Critical patent/WO2015182448A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • 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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics

Definitions

  • the present invention relates to a reflective film used for a backlight of a liquid crystal display device or the like, and more particularly to a reflective film suitable for an edge light type backlight unit.
  • the liquid crystal display device generally employs a backlight system that emits light by illuminating a liquid crystal layer from the back side.
  • a backlight system that emits light by illuminating a liquid crystal layer from the back side.
  • an edge light type and a direct type are known.
  • a resin layer containing particles (also referred to as a bead layer, a particle-containing layer, or a coating layer) is laminated on at least one surface of a white film, and a convex portion made of particles on the surface ( A reflection film in which protrusions are formed is known.
  • Patent Document 1 a resin layer that defines particle coverage, the number of particles stacked, the height of protrusions, the number of protruding particles, and the like has been proposed (for example, Patent Document 1). ⁇ 4).
  • polyolefin particles typified by polyethylene particles and polypropylene particles have properties of relatively low hardness and relatively little deterioration (discoloration, etc.) due to heat, taking advantage of these properties. Began developing a reflective film.
  • polyethylene particles have relatively good slipperiness.
  • polyethylene particles generally known from the past are included in the resin layer to form protrusions (projections) on the surface of the reflective film, the slipperiness due to contact with the light guide plate is not sufficiently exhibited.
  • the polyethylene particles (shaving powder) scraped by contact with the light guide plate adheres (transfers) to the light guide plate and contaminates the light guide plate.
  • an object of the present invention is to stick to a member (for example, a light guide plate) that is in contact with a reflective film, taking advantage of the characteristics of polyolefin particles (the characteristics of relatively low hardness and relatively little deterioration (discoloration) against heat).
  • the contact member for example, the light guide plate
  • the contact member can be prevented from being damaged (scratch scratches and shaving powder transfer contamination) and the contact member (for example, the light guide plate) can be prevented from being contaminated by heat, and the heat resistance is good.
  • An object of the present invention is to provide a reflective film (small color change due to heat) and an edge light type backlight unit using the same.
  • the present invention has the following configuration.
  • a reflective film comprising a resin layer containing polyolefin particles having a viscosity average molecular weight of 500,000 or more on at least one surface of a substrate film.
  • the polyolefin particles are polyethylene particles and / or polypropylene particles.
  • the reflective film according to [1] or [2], wherein the polyolefin particles have an average particle diameter (r: ⁇ m) of 5 to 100 ⁇ m.
  • the base film is a white film in which a film layer (A layer) for supporting the B layer is laminated on both surfaces of a film layer (B layer) containing bubbles inside.
  • damage to the contact member for example, the light guide plate
  • scratch scratch It is possible to provide a reflective film that can suppress contamination of the shaving powder) and contamination of the contact member (for example, the light guide plate) due to heat and has good heat resistance (small discoloration due to heat).
  • the member (contact member) that comes into contact with the reflective film is not particularly limited, and the contact member is appropriately selected depending on the application and intended use of the reflective film.
  • the reflective film of the present invention is particularly suitable for an edge-light type backlight unit, and the unit is disposed in contact with the reflective film and the light guide plate.
  • the light guide plate will be described as an example of the contact member. To do.
  • White spot unevenness (a phenomenon in which a spot that is brightly visible in a dotted shape occurs) may occur due to sticking between the reflective film and the light guide plate, but sticking to the light guide plate by using the reflective film of the present invention. Sticking is suppressed, and as a result, the occurrence of uneven white spots is suppressed.
  • a light guide plate may be damaged when a reflective film and a light guide plate contact, damage to a light guide plate is suppressed by using a reflective film of the present invention.
  • the damage to the light guide plate means, for example, that the light guide plate is scratched or that particles in the resin layer of the reflective film are scraped and the shaving powder is transferred to the light guide plate to contaminate the light guide plate. .
  • the backlight unit of the liquid crystal display device may become hot when the liquid crystal display device is turned on.
  • conventional polyethylene particles are used as particles to be included in the resin layer, the polyethylene particles melt and contaminate the light guide plate.
  • the reflective film of the present invention such contamination of the light guide plate by heat is suppressed.
  • the reflective film of the present invention has good heat resistance (discoloration due to heat) by using polyolefin particles having a viscosity average molecular weight of 500,000 or more.
  • FIG. 1 is a view showing an image of a surface photograph taken by a scanning electron microscope on the surface of a resin layer showing an example of a reflective film according to the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an example of a resin layer according to the present invention.
  • FIG. 3 is a schematic cross-sectional view showing an example of a resin layer according to the present invention.
  • the reflective film of the present invention has a resin layer containing polyolefin particles having a viscosity average molecular weight of 500,000 or more on at least one surface of a base film.
  • the reflective film of the present invention preferably has a convex portion formed of the polyolefin particles on the surface of the resin layer.
  • the convex portions as described above on the surface of the resin layer because sticking between the reflective film and the light guide plate is suppressed, and as a result, occurrence of white spot unevenness is suppressed. Then, it is preferable to form the convex portion with polyolefin particles having a viscosity average molecular weight of 500,000 or more because damage to the light guide plate (scratch scratches and transfer contamination of shaving powder) and contamination of the light guide plate due to heat are suppressed. In addition, it is preferable to use polyolefin particles having a viscosity average molecular weight of 500,000 or more because heat resistance (discoloration due to heat) is improved.
  • FIG. 1 shows an image of a surface photograph taken by a scanning electron microscope on the surface of a resin layer as an example of a reflective film according to the present invention. It can be clearly confirmed that there are convex portions due to particles on the surface of the resin layer.
  • reference numeral 1 denotes a resin film
  • reference numeral 2 denotes particles (polyolefin particles having a viscosity average molecular weight of 500,000 or more).
  • the convex portions formed by particles on the surface of the resin layer may be formed such that only a part of the particles protrudes from the surface (FIG. 2A), or more than half of the particles may protrude from the surface. (FIG. 2 (B)).
  • the convex portion may be formed of individual particles as shown in FIGS. 2A and 2B, or the convex portion may be formed in a state where a plurality of particles are aggregated or aggregated. Good (FIG. 2C).
  • grains may be arrange
  • the convex part may be formed in the state (FIG. 3B).
  • a part or all of the convex region is covered with a resin (binder) contained in the resin layer. This is preferable because dropout of particles is effectively suppressed.
  • polyolefin particles having a viscosity average molecular weight of 500,000 or more are not particularly limited, but specific examples thereof include, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, Examples thereof include particles composed of ⁇ -olefins such as octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, 3-methyl-1-pentene, and homopolymers or copolymers of cyclic olefins.
  • a homopolymer of ethylene or propylene which is an olefin having a small number of carbon atoms
  • a copolymer mainly composed of ethylene or propylene are preferable.
  • These particles ethylene or propylene homopolymers and copolymers based on ethylene or propylene
  • are compared to other polyolefin particles polyolefin particles based on olefins having a relatively large number of carbon atoms. Since hardness is comparatively small, since damage to a light-guide plate can be suppressed effectively, it is preferable.
  • the resin layer may contain both polyethylene particles and polypropylene particles.
  • Examples of the copolymer component of the above copolymer containing ethylene as a main component include ⁇ -olefins such as propylene, 1-butene, 1-hexene, 1-octene and 4-methyl-1-pentene, and cyclic olefins. Is mentioned.
  • Examples of the copolymer component of the copolymer having propylene as a main component include, for example, ⁇ -olefins such as ethylene, 1-butene, 1-hexene, 1-octene and 4-methyl-1-pentene, and cyclic compounds. Examples include olefins.
  • the content ratio of ethylene or propylene in these copolymers is preferably 50% by mass or more, more preferably 70% by mass or more, and particularly preferably 90% by mass or more.
  • the upper limit is about 99% by mass.
  • polyethylene particles made of an ethylene homopolymer and a copolymer containing ethylene as a main component are preferred, and polyethylene particles made of an ethylene homopolymer are particularly preferred.
  • the polyethylene particles have relatively good mixing with the resin layer, and as a result, the coating property of the resin layer is relatively good. There is an advantage.
  • polyolefin particles having a viscosity average molecular weight of 500,000 or more may be simply referred to as “polyolefin particles”.
  • polyolefin particles means “polyolefin particles having a viscosity average molecular weight of 500,000 or more”.
  • the polyolefin particles in the present invention have a viscosity average molecular weight of 500,000 or more. That is, the polyolefin particles in the present invention are ultra-high molecular weight polyolefin particles compared to conventionally known low molecular weight polyolefin particles (viscosity average molecular weight is 100,000 or less).
  • the viscosity average molecular weight of the polyolefin particles is preferably 800,000 or more, more preferably 1,000,000 or more, and particularly preferably 1,500,000 or more, from the viewpoint of sufficiently suppressing contamination of the light guide plate by heat. preferable.
  • the upper limit of the viscosity average molecular weight is not particularly limited, but is preferably 20 million or less, more preferably 10 million or less, particularly preferably 7 million or less, and most preferably 5 million or less.
  • Polyethylene particles having a viscosity average molecular weight of 500,000 or more made of an ethylene homopolymer can be synthesized by referring to, for example, JP 2012-25817 A, International Publication No. 2009/011231 Pamphlet, and the like.
  • polyethylene particles having a viscosity average molecular weight of 500,000 or more made of a copolymer containing ethylene as a main component (a copolymer with another ⁇ -olefin) can be obtained by referring to, for example, JP-A-2007-23171. Can be synthesized.
  • polypropylene particles having a viscosity average molecular weight of 500,000 or more made of a propylene homopolymer are disclosed in, for example, JP-A-6-234812, JP-A-7-292202, JP-A-2005-298726, etc. Can be synthesized.
  • polyethylene particles having a viscosity average molecular weight of 500,000 or more are generally commercially available and can be obtained.
  • “Miperon (registered trademark)” series (trade name, manufactured by Mitsui Chemicals), “Hi-Zex Million (registered trademark)” series (trade name, manufactured by Mitsui Chemicals), “Sunfine (registered trademark)” series (product) Name, manufactured by Asahi Kasei Chemicals), "Dyneema (registered trademark)” series (trade name, manufactured by DSM), "Spectra (registered trademark)” series (trade name, manufactured by Honeywell), “GUR (registered trademark)” series (Trade name, manufactured by Chicona), “Hostalen® (registered trademark) ®” series (trade name, Hoechst), and the like.
  • the polyolefin particles in the present invention are preferably contained so that convex portions of the polyolefin particles are formed on the surface of the resin layer.
  • the average particle diameter (r: ⁇ m) of the polyolefin particles is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and particularly preferably 15 ⁇ m or more.
  • the upper limit of the average particle diameter of the polyolefin particles is preferably 100 ⁇ m or less, more preferably 75 ⁇ m or less, from the viewpoint of suppressing dropping of the polyolefin particles and ensuring uniform coatability when the resin layer is formed by coating.
  • the thickness is preferably 50 ⁇ m or less.
  • the film is prevented from falling off and the coating property is ensured and uniform coating properties are ensured. Sticking with the light plate can be effectively suppressed. Moreover, since the convex part formed with polyolefin particle
  • the average particle diameter (r: ⁇ m) is a square or rectangle having the smallest area that completely surrounds one particle on a photograph.
  • the length (major axis diameter) is defined as the maximum length of the particles, and is a value obtained by averaging the maximum lengths of the number of particles described in the examples.
  • the shape of the polyolefin particles in the present invention is preferably spherical.
  • spherical does not necessarily mean only a true sphere, but means that the cross-sectional shape of the particle is surrounded by a curved surface such as a circle, an ellipse, a substantially circle, or a substantially ellipse.
  • the ratio of major axis to minor axis means 1.4 or less.
  • the resin layer in the present invention preferably contains polyolefin particles and a resin (binder).
  • the resin is not particularly limited, but a resin mainly composed of organic components is preferable.
  • polyester resins polyurethane resins, acrylic resins or methacrylic resins are preferably used in terms of heat resistance, additive dispersibility, productivity, and glossiness.
  • ultraviolet absorbing component contained in these resins include benzotriazole and benzophenone, and examples of the light stabilizing component contained in the resin include hindered amine (HALS).
  • HALS hindered amine
  • a resin containing an ultraviolet absorbing component and a light stabilizing component is preferable.
  • a resin obtained by copolymerizing a polymerizable monomer containing an ultraviolet absorbing component in the molecule and an acrylic monomer a resin obtained by copolymerizing a polymerizable monomer containing a light stabilizing component in the molecule and an acrylic monomer, or Examples thereof include a resin obtained by copolymerizing a polymerizable monomer containing an ultraviolet absorbing component in the molecule, a polymerizable monomer containing a light stabilizing component in the molecule, and an acrylic monomer.
  • Examples of the polymerizable monomer containing an ultraviolet absorbing component in the molecule include 2- (2′-hydroxy-5′-methacryloxyethylphenyl) -2H-benzotriazole (trade name “Otsuka Chemical Co., Ltd.”). RUVA-93 ").
  • Examples of the polymerizable monomer containing a light stabilizing component in the molecule include, for example, 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine (trade name “ADK STAB (registered trademark)” manufactured by ADEKA Corporation). LA-82 ").
  • the content of polyolefin particles in the resin layer is 3 mass% or more is preferable with respect to 100 mass% of solid content, 5 mass% or more is more preferable, 7 mass% or more is further more preferable, and 10 mass% or more is especially preferable.
  • the upper limit content is preferably 75% by mass or less, more preferably 60% by mass or less, from the viewpoint of suppressing the dropping of the polyolefin particles and from the viewpoint of ensuring uniform coatability during the formation of the resin layer. 55 mass% or less is particularly preferable. That is, the content of polyolefin particles in the resin layer is preferably 3 to 75% by mass with respect to 100% by mass of the total solid content of the resin layer.
  • the content of the resin (binder) in the resin layer is determined from the viewpoint of fixing the polyolefin particles and suppressing dropping off, and from the viewpoint of ensuring uniform coatability when the resin layer is applied and formed. 20 mass% or more is preferable with respect to the total amount of 100 mass%, 25 mass% or more is more preferable, and 30 mass% or more is especially preferable.
  • the upper limit of the resin content is preferably 90% by mass or less, and 85% by mass with respect to 100% by mass of the total solid content of the resin layer, from the viewpoint of forming a moderately large convex portion on the resin layer surface in an appropriate amount. The following is more preferable, and 80% by mass or less is particularly preferable.
  • the resin layer preferably further contains a crosslinking agent. That is, the resin layer is formed from a composition containing the above-described resin (binder) and a crosslinking agent, thereby forming a crosslinked structure in the resin layer and improving the hardness of the resin layer. It is preferable because the effect of suppressing dropout can be improved.
  • an isocyanate-based, melamine-based, or epoxy-based crosslinking agent is preferable, and an isocyanate-based crosslinking agent is preferable from the viewpoint that a crosslinking reaction can be rapidly performed even at a relatively low temperature.
  • the content of the crosslinking agent in the resin layer is preferably in the range of 0.3 to 20% by mass, more preferably in the range of 0.5 to 15% by mass, with respect to 100% by mass of the total solid content of the resin layer.
  • a mass% range is particularly preferred.
  • the reflective film of the present invention may be charged during processing (the reflective film is punched out, molded and incorporated into the backlight), etc., and there may be a problem that charged dust or dust existing in the surroundings adheres. is there.
  • the resin layer contains an antistatic agent within a range that does not impair the effects of the present invention.
  • antistatic agents examples include organic antistatic agents such as cationic resins and anionic resins, conductive inorganic compounds (for example, tin oxide, antimony-doped tin oxide (ATO), indium oxide, tin-doped indium oxide, etc.) ).
  • organic antistatic agents such as cationic resins and anionic resins
  • conductive inorganic compounds for example, tin oxide, antimony-doped tin oxide (ATO), indium oxide, tin-doped indium oxide, etc.
  • additives can be further added to the resin layer in the present invention as long as the effects of the present invention are not impaired.
  • the additive include a fluorescent brightening agent, a heat stabilizer, an oxidation stabilizer, an organic lubricant, a coupling agent, a dye, and a pigment.
  • the thickness (d) of the resin layer is not particularly limited, but is preferably in the range of 0.3 to 20 ⁇ m, more preferably in the range of 0.5 to 15 ⁇ m, and particularly preferably in the range of 1 to 10 ⁇ m.
  • the thickness of the resin layer means the thickness of a portion where no convex portion due to particles exists on the resin layer. That is, it is the thickness of the portion where there is no protrusion due to particles.
  • the thickness of the resin layer is less than 0.3 ⁇ m, the polyolefin particles may fall off. On the other hand, if the thickness of the resin layer exceeds 20 ⁇ m, the convex portions due to the polyolefin particles may not be sufficiently formed.
  • the average particle diameter of polyolefin particles contained in the resin layer is preferably 1.5 or more, more preferably 2.0 or more, and particularly preferably 3.0 or more.
  • the upper limit of the ratio (r / d) is preferably 30 or less, more preferably 25 or less, and particularly preferably 20 or less, from the viewpoint of suppressing the dropping of the polyolefin particles.
  • the thickness of the resin layer can be determined, for example, as follows. First, the reflective film of the present invention is cut in a direction perpendicular to the film plane at a knife inclination angle of 3 ° using a rotary microtome manufactured by Nippon Microtome Research Co., Ltd. The obtained film cross section was observed using a scanning electron microscope (S-3400N manufactured by Hitachi, Ltd.), and the resin layer surface was a resin, not the part where particles were seen on the resin layer surface. The thickness of five portions is measured, and the average value is taken as the thickness of the resin layer.
  • the present invention includes a mode in which, as shown in FIGS. 3 (A) and 3 (B), the particles are arranged in a plane on the surface of the resin layer with almost no gaps to form convex portions.
  • the thickness of the resin layer means that five distances from the substrate surface to the particle surface are measured, and the average value is referred to as the thickness of the resin layer.
  • one of the convex regions formed by the particles Part or all can be covered with a resin contained in the resin layer.
  • the resin layer can contain particles other than the polyolefin particles (hereinafter referred to as “other particles”).
  • other particles are contained in the resin layer
  • the average particle diameter of the other particles is preferably smaller than the average particle diameter of the polyolefin particles. It is preferable for the resin layer to contain other particles having a relatively small average particle diameter, since the scratch resistance of the resin layer (characteristic that makes it difficult for scratches to enter) is improved.
  • the average particle diameter of the other particles is preferably 0.8 times or less, more preferably 0.7 times or less, and particularly preferably 0.6 times or less that of the polyolefin particles.
  • the lower limit is preferably 0.05 times or more, and more preferably 0.1 times or more.
  • the average particle diameter of the other particles is preferably in the range of 1 to 20 ⁇ m, more preferably in the range of 2 to 15 ⁇ m.
  • the content of other particles in the resin layer is preferably in the range of 10 to 200 parts by weight, more preferably in the range of 20 to 150 parts by weight, and particularly preferably in the range of 30 to 130 parts by weight with respect to 100 parts by weight of the polyolefin particles. .
  • Examples of other particles include organic resin particles such as acrylic resin particles, silicone resin particles, nylon resin particles, styrene resin particles, benzoguanamine resin particles, urethane resin particles, and polyester resin particles.
  • Organic particles or inorganic particles such as silica, aluminum hydroxide, aluminum oxide, zinc oxide, barium sulfide, magnesium silicate and the like can be mentioned.
  • nylon resin particles are preferable. Since the nylon resin particles have a relatively low hardness, they are preferable from the viewpoint of suppressing damage to the light guide plate.
  • the resin layer is provided on at least one surface of the base film.
  • the resin layer may be provided only on one side of the base film, or may be provided on both sides of the base film.
  • the lamination of the resin layer can be performed by, for example, applying and drying a coating composition (coating liquid) containing at least a resin, polyolefin particles, and an organic solvent on a base film.
  • a coating composition coating liquid containing at least a resin, polyolefin particles, and an organic solvent on a base film.
  • any coating method can be used for coating the coating composition of the resin layer on the base film.
  • coating methods such as gravure coating, roll coating, spin coating, reverse coating, bar coating, screen coating, blade coating, air knife coating, and dipping can be used.
  • the coating composition of the resin layer may be applied at the time of manufacturing the base film (in-line coating), or may be applied on the base film after completion of crystal orientation (off-line coating).
  • Base film It does not specifically limit as a base film, Silver, the vapor deposition film of aluminum, the laminate film of silver foil or aluminum foil, a white film, a multilayer laminated film, etc. are mentioned.
  • the base film When the base film is used as a reflective film, the higher the visible light reflectance, the better. For this reason, a white film containing bubbles and / or incompatible particles therein is preferably used.
  • the white film is, for example, a film that is made white by adding a white colorant and / or air bubbles to a film made of a thermoplastic resin or the like.
  • the white film preferably has a high visible light reflectance (for example, the reflectance of visible light (wavelength 550 nm) is preferably 95% or more). From this viewpoint, a white film having at least air bubbles inside is preferably used. It is done.
  • a high visible light reflectance for example, the reflectance of visible light (wavelength 550 nm) is preferably 95% or more. From this viewpoint, a white film having at least air bubbles inside is preferably used. It is done.
  • the white film having air bubbles inside is not particularly limited, and examples thereof include a porous unstretched or biaxially stretched polypropylene film and a porous unstretched or stretched polyethylene terephthalate film.
  • a porous unstretched or biaxially stretched polypropylene film and a porous unstretched or stretched polyethylene terephthalate film.
  • porous white biaxially stretched polyethylene terephthalate film disclosed in JP-A-2002-90515 or the porous white biaxially stretched polyethylene terephthalate film mixed and / or copolymerized with polyethylene naphthalate is preferably used.
  • a film layer (A layer) for supporting (holding) the B layer is laminated on at least one surface of the above-described film layer (B layer) containing bubbles.
  • the A layer may be laminated only on one side of the B layer, or may be laminated on both sides of the B layer. That is, a two-layer configuration of A layer / B layer and a three-layer configuration of A1 layer / B layer / A2 layer can be mentioned.
  • a three-layer configuration of A1 layer / B layer / A2 layer is preferable.
  • the A1 layer and the A2 layer are A layers, and the A1 layer and the A2 layer may have the same configuration (composition and thickness are the same), or may be different configurations (at least one of the composition and thickness is different). There may be.
  • the A1 layer and the A2 layer may be configured with the same composition or may be configured with different compositions, but from the viewpoint of the productivity of the white film, It is preferable that A2 layer is comprised by the completely same composition.
  • the A1 layer and the A2 layer may be collectively referred to as “A layer”, and the expression “A layer” includes the two-layer A layer, the three-layer A1 layer, and the A2 layer. Is included.
  • the content of various materials contained in the A layer refers to the content per layer.
  • the A layer has a function of supporting (holding) the B layer.
  • the A layer is preferably a resin-based layer.
  • the A layer is a layer mainly composed of a resin means that the resin is contained in an amount of 50% by mass or more with respect to 100% by mass of the total solid content of the A layer.
  • the A layer preferably contains 60% by mass or more of resin, more preferably 70% by mass or more, and particularly preferably 80% by mass or more. The upper limit is about 99% by mass.
  • the layer A preferably contains particles.
  • an appropriate slip property can be imparted to the reflective film.
  • handling properties and workability such as punching for forming a transmission portion (opening portion) are improved.
  • a polyester resin is preferable.
  • a polyester resin polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is preferable.
  • various known additives such as an antioxidant and an antistatic agent may be added to the polyester resin.
  • the content of the polyester resin constituting the A layer is preferably 50 parts by mass or more, more preferably 60 parts by mass or more, and particularly preferably 70 parts by mass or more with respect to 100 parts by mass of the total resin constituting the A layer.
  • the upper limit is about 99 parts by mass.
  • Examples of the particles contained in the A layer include organic particles and inorganic particles.
  • Examples of the organic particles include polyester resins, polyamide resins such as benzoguanamine, polyurethane resins, acrylic resins, methacrylic resins, polyamide resins, polyethylene resins, polypropylene resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins, polyacetic acids.
  • examples thereof include particles made of a resin such as a vinyl resin, a fluorine resin, and a silicone resin, and particles made of a copolymer or a mixture of two or more of the above resins.
  • 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, fluoride. And lithium fluoride and calcium fluoride.
  • inorganic particles are preferable, and among the inorganic particles, calcium carbonate, titanium oxide, barium sulfate, and silica are preferably used.
  • the average particle size of the particles contained in the layer A is preferably in the range of 0.05 to 10 ⁇ m, more preferably in the range of 0.1 to 5 ⁇ m, and still more preferably in the range of 0.2 to 3 ⁇ m.
  • the content of particles in the A layer is preferably 0.005% by mass or more, and more preferably 0.01% by mass or more with respect to 100% by mass of the total solid content of the A layer.
  • the upper limit content is preferably 20% by mass or less, more preferably 10% by mass or less, and particularly preferably 5% by mass or less with respect to 100% by mass of the total solid content of the A layer.
  • the content of the particles is less than 0.005% by mass, good sliding properties may not be obtained.
  • the content of the particles exceeds 20% by mass, the film forming property may be deteriorated.
  • the B layer is preferably a layer that is whitened by containing fine bubbles inside the film layer.
  • the layer B is preferably a porous unstretched or biaxially stretched polypropylene film or a porous unstretched or stretched polyethylene terephthalate film.
  • the method for producing the film layer (B layer) containing bubbles in the inside is disclosed in, for example, JP-A-8-262208, JP-A-2002-90515, JP-A-2002-138150, etc. It is disclosed in detail and can be used in the present invention.
  • the B layer is preferably made of a polypropylene resin or a polyester resin, and particularly preferably made of a polyester resin.
  • a polyester resin As the polyester resin constituting the B layer, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is preferable.
  • various known additives such as an antioxidant and an antistatic agent may be added to the polyester resin.
  • the content of the polyester resin constituting the B layer is preferably 50% by mass or more, more preferably 60% by mass or more, and particularly preferably 70% by mass or more with respect to 100% by mass of the solid content of the B layer. The upper limit is about 95% by mass.
  • Formation of air bubbles in the B layer can be achieved, for example, by finely dispersing a resin incompatible with the polyester resin in a polyester film that is a film substrate and stretching (for example, biaxial stretching).
  • the B layer is preferably mixed with a polyester resin constituting the B layer in an incompatible resin (hereinafter sometimes referred to as an incompatible resin).
  • an incompatible resin hereinafter sometimes referred to as an incompatible resin.
  • the inclusion of the incompatible resin is preferable because a cavity having the incompatible resin as a nucleus is formed at the time of stretching, and light reflection occurs at the cavity interface.
  • the resin incompatible with the polyester resin may be a homopolymer or a copolymer.
  • Polyolefin resin such as polyethylene, polypropylene, polybutene, polymethylpentene, cyclic polyolefin resin, polystyrene resin, polyacrylate Resins, polycarbonate resins, polyacrylonitrile resins, polyphenylene sulfide resins, fluororesins, and the like are preferably used. Two or more of these may be used in combination.
  • polyolefin resin examples include polyolefin resins such as polyethylene, polypropylene, polybutene, and polymethylpentene, cyclic polyolefin resins, and copolymers thereof.
  • the preferable content of the incompatible resin to be contained in the B layer is 5% by mass or more and 25% by mass or less with respect to 100% by mass of the solid content of the B layer.
  • the incompatible resin contained in the B layer is dispersed in a matrix made of a polyester resin with a number average particle diameter of 0.4 ⁇ m or more and 3.0 ⁇ m or less. It is preferable in obtaining.
  • the number average particle size of the incompatible resin is preferably in the range of 0.5 ⁇ m to 1.5 ⁇ m.
  • the number average particle diameter here is a cross section of the film in the width direction (TD), and the B layer portion of the cross section is a scanning electron microscope (FE-SEM) model S-2100A manufactured by Hitachi, Ltd. The average value of the diameters when the area of 100 particles observed in this way is obtained and converted to a perfect circle.
  • the layer B further contains particles such as organic particles and inorganic particles.
  • particles include the same particles as those that can be contained in the A layer.
  • inorganic particles such as calcium carbonate, barium sulfate, and titanium dioxide that absorb less in the visible light range of wavelength 400 to 700 nm are preferable from the viewpoints of reflection characteristics, concealability, production cost, and the like.
  • barium sulfate and titanium dioxide are most preferable from the viewpoints of film winding property, long-term film-forming stability, and improvement in reflection characteristics.
  • the average particle diameter of the particles is preferably in the range of 0.1 to 3 ⁇ m. Use of such inorganic particles is preferable because the reflectivity and concealability are improved.
  • the content of the inorganic particles in the B layer is preferably 0.1% by mass or more, based on the total solid content of the B layer of 100% by mass, and 0.5% by mass from the viewpoint of ensuring good reflection characteristics and concealment.
  • the above is more preferable, and particularly 1% by mass or more is preferable.
  • the upper limit content of the inorganic particles is preferably 10% by mass or less, and 5% by mass. The following is more preferable, and 3% by mass or less is particularly preferable.
  • the B layer preferably further contains a copolyester.
  • a copolyester By containing the copolyester in the B layer, it is possible to stably form a film even when the B layer contains a relatively high concentration of inorganic particles.
  • the copolyester also has a role as a dispersant for the incompatible resin in the B layer.
  • Examples of such a copolyester include a copolymer of polyethylene terephthalate and isophthalic acid, a copolymer of polyethylene terephthalate and cyclohexanedimethanol, a copolymer of polybutylene terephthalate and polytetramethylene terephthalate, and the like. In this invention, it is preferable to contain at least 2 types chosen from the group which consists of these copolyesters.
  • the thickness of the base film is preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more, and particularly preferably 100 ⁇ m or more from the viewpoint of ensuring high reflectance.
  • the upper limit of the thickness is preferably 1,000 ⁇ m or less, more preferably 400 ⁇ m or less, and particularly preferably 300 ⁇ m or less from the viewpoint of reducing the thickness of the backlight unit.
  • a commercially available base film can be used.
  • “Lumirror (registered trademark)” E20 manufactured by Toray Industries, Inc.
  • SY90, SY95 (manufactured by SKC), and the like can be mentioned.
  • Optilon registered trademark
  • MPET registered trademark
  • the reflective film of the present invention is suitable for a backlight unit of a liquid crystal display device.
  • the backlight method an edge light type and a direct type are generally employed, but the reflective film of the present invention is applied to both methods.
  • the reflective film of the present invention is suitable for an edge light type backlight system.
  • the edge-light type backlight system is a system in which light from a light source disposed at a side end portion of a light guide plate is propagated through the light guide plate to illuminate a liquid crystal layer (screen). Is disposed on the opposite side of the liquid crystal layer. At this time, the reflective film of the present invention is disposed so that the surface on which the resin layer is laminated faces the light guide plate.
  • the edge light type backlight system has a problem of damaging the light guide plate due to contact between the light guide plate and the reflective film, and white spot unevenness due to adhesion between the light guide plate and the reflective film.
  • these problems are alleviated by using the reflective film of the present invention.
  • Viscosity average molecular weight (1-1) Viscosity average molecular weight of polyolefin particles Viscosity average molecular weight (Mv) is measured according to JIS K7367 (1999). When the intrinsic viscosity is [ ⁇ ], the viscosity average molecular weight (Mv) is represented by the following formula. Mv a ⁇ [ ⁇ ] b (Here, a and b are coefficients and are determined by the composition of the solvent and polymer).
  • polyethylene particles including ethylene homopolymer and ethylene-based copolymer
  • polypropylene particles including propylene homopolymer and propylene-based copolymer
  • Viscosity average molecular weight of polyethylene particles (including ethylene homopolymer and ethylene-based copolymer) According to JIS K7367-3 (1999), intrinsic viscosity [ ⁇ ] and viscosity average molecular weight (Mv ) was measured. 20 mL of decalin (containing 1 g / L of dibutylhydroxytoluene (BHT)) was charged with 20 mg of polyethylene particles and stirred at 150 ° C. for 2 hours to dissolve the polyethylene particles. The solution was measured at a constant temperature of 135 ° C. using a Canon-Fenske viscometer (model number: SO) to measure the drop time (ts) between the marked lines.
  • BHT dibutylhydroxytoluene
  • Viscosity average molecular weight of polypropylene particles (including a propylene homopolymer and a copolymer containing propylene as a main component)
  • the intrinsic viscosity [ ⁇ ] was determined in the same manner as in (1-2) above,
  • the maximum length of a particle is a square or rectangle having the smallest area that completely surrounds one particle (that is, a square or rectangle in which the particle is in contact with the four sides of the square or rectangle).
  • the length of the side, and in the case of a rectangle, the length of the long side (major axis diameter) was taken as the maximum length of the particle (that is, the longest constant tangent diameter was taken as the maximum length of the particle).
  • Heat resistance evaluation 2 contamination of light guide plate by heat
  • a 17-inch liquid crystal television manufactured by Panasonic Corporation, “VIERA (registered trademark)” TH-L17F1
  • VIERA registered trademark
  • TH-L17F1 an edge light type backlight
  • the size of the light emitting surface of the backlight A was 37.5 cm ⁇ 21.2 cm, and the diagonal length was 43.1 cm.
  • three optical films, a light guide plate (acrylic plate, 3.5 mm thickness, height of the convex portion formed on the light guide plate 12 ⁇ m) and a reflection film are taken out from the backlight A, and the reflection of the examples and comparative examples of the present invention.
  • the film was cut into the same shape and size as the reflective film on which the film was mounted. Instead of the mounted reflective film, the reflective film was cut so that the surface of the resin layer of the reflective film faced the light guide plate side, and the light guide plate and the three optical films were installed in the same order and direction as before disassembly.
  • the backlight A thus disassembled and assembled is heated for 1 hour in an atmosphere of 80 ° C., then left at room temperature for 1 hour, the liquid crystal television is disassembled again, and the surface of the light guide plate on which the reflective film is in contact
  • the contamination state was visually evaluated. S: There is no contamination. A: Slight contamination is observed, but at an acceptable level. B: Contaminated.
  • Class B 200 gf / cm 2 of but scratches is observed under load, under a load of 100 gf / cm 2, not seen wounds under a load of 50 gf / cm 2.
  • Class C 200gf / cm 2, but scratches observed under a load of 100 gf / cm 2, not seen wounds under a load of 50 gf / cm 2.
  • Class D Scratches are observed under a load of 50 gf / cm 2 .
  • the cut reflective film was placed so that the resin layer surface of the reflective film faces the light guide plate side, and the light guide plate and the three optical films were placed in the same direction and direction as before the disassembly.
  • the liquid crystal television was turned on, and white spot unevenness was visually observed. S: A white spot is not observed. A: A white point is slightly observed, but it is an acceptable level. B: A white spot is clearly observed.
  • particles to be included in the resin layer Various particles as shown below were prepared. The shape of the particles is spherical except for the low molecular weight polyethylene particles 2 (indefinite shape) described later.
  • ⁇ Polyethylene particles (a); ethylene homopolymer> "Miperon (registered trademark)” XM-220, Mitsui Chemicals Co., Ltd., viscosity average molecular weight 2 million ⁇ polyethylene particles (b); ethylene homopolymer> “Miperon (registered trademark)” XM-221U, Mitsui Chemicals, Inc., viscosity average molecular weight 2 million ⁇ polyethylene particles (c); homopolymer of ethylene> “Miperon (registered trademark)” PM-200 manufactured by Mitsui Chemicals, Inc., viscosity average molecular weight 1.8 million ⁇ polyethylene particles (d); homopolymer of ethylene> “Miperon (registered trademark)” XM-330, Mitsui Chemicals Co., Ltd., viscosity average molecular weight 2 million ⁇ polyethylene particles (e); ethylene homopolymer> Hoechst's “Hostalen®
  • polyethylene particles (i) having a viscosity average molecular weight of 600,000 are adjusted by adjusting the charged amount of the solid transition metal catalyst component, the total pressure during ethylene supply, and the ethylene supply time.
  • polyethylene particles (j) having a viscosity average molecular weight of 1,200,000 are adjusted by adjusting the charged amount of the solid transition metal catalyst component, the total pressure during ethylene supply, and the ethylene supply time.
  • Polyethylene particles (k); homopolymer of ethylene In the synthesis of the above polyethylene particles (h), polyethylene particles (k) having a viscosity average molecular weight of 6 million are adjusted by adjusting the charged amount of the solid transition metal catalyst component, the total pressure during ethylene supply, and the ethylene supply time. Got.
  • the solid transition metal catalyst component prepared by the above operation was stored as a decant slurry.
  • the yield of the total polymer obtained was 65.3 g, and the composition of the polymer calculated from the relationship between the cumulative amount of ethylene supplied to the reaction system and the yield of the total polymer was polyethylene by mass ratio: 93% by mass, Poly-4-methyl-1-pentene; 7% by mass.
  • the viscosity average molecular weight of the obtained copolymer was 3 million.
  • a first stage reactor equipped with a stirrer with a capacity of 600 liters was charged with 110 kg of liquefied propylene monomer, 5 liters of the prepolymer slurry obtained in (1) above, 0.14 moles of triethylaluminum, 0.14 moles of dicyclopentyldimethoxysilane and 5Nliters of hydrogen. Then, polymerization was performed at a temperature of 70 ° C. for 1 hour to obtain polypropylene particles. The viscosity average molecular weight of the polypropylene particles was 1.6 million.
  • Example 1 The following resin layer coating solution was applied to one side of a white film (“Lumirror (registered trademark)” E6SQ manufactured by Toray Industries, Inc.) using a bar coater so that the resin layer thickness was about 3 ⁇ m. The resin layer was laminated by drying at 0 ° C. to produce a reflective film.
  • a white film (“Lumirror (registered trademark)” E6SQ manufactured by Toray Industries, Inc.)
  • the resin layer was laminated by drying at 0 ° C. to produce a reflective film.
  • ⁇ Resin layer coating solution 70 parts by mass of benzotriazole-containing acrylic copolymer resin (“HALS HYBRID (registered trademark)” UV-G720T concentration 40% by mass solution manufactured by Nippon Shokubai Co., Ltd.), polyethylene particles a (“Miperon (Mitsui Chemical Co., Ltd.)” (Registered trademark) “XM-220, viscosity average molecular weight 2 million) 12 parts by mass, isocyanate-based crosslinking agent (Nippon Polyurethane Industry Co., Ltd.“ Coronate (registered trademark) ”HL, concentration 75% by mass) 2.7 parts by mass, acetic acid A coating solution was prepared by adding 55 parts by mass of ethyl with stirring.
  • HALS HYBRID registered trademark
  • polyethylene particles a (“Miperon (Mitsui Chemical Co., Ltd.)” (Registered trademark
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 28.6% by mass, and the content ratio of the resin is 66.7% by mass.
  • Examples 2 to 13 and Comparative Examples 1 to 4 A reflective film was produced in the same manner as in Example 1 except that the polyethylene particles in the resin layer coating solution of Example 1 were changed to the particles shown in Table 1. Examples 4 and 6 were applied so that the resin layer thickness was about 6 ⁇ m.
  • Example 14 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • Benzotriazole-containing acrylic copolymer resin (“Hals Hybrid (registered trademark)” manufactured by Nippon Shokubai Co., Ltd.), 50 parts by mass, polyethylene particles a (Mitrone (Mitsui Chemicals) (Registered trademark) “XM-220, viscosity average molecular weight 2 million) 20 parts by mass, isocyanate-based crosslinking agent (Nippon Polyurethane Industry Co., Ltd.“ Coronate (registered trademark) ”HL, concentration 75% by mass) 2.7 parts by mass, acetic acid 67 parts by mass of ethyl was added with stirring to prepare a coating solution.
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 47.6% by mass, and the content ratio of the resin is 47.6% by mass.
  • Example 15 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating liquid is 14.3% by mass, and the content ratio of the resin is 81.0% by mass.
  • Example 16 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • ⁇ Resin layer coating solution> Benzotriazole-containing acrylic copolymer resin (manufactured by Nippon Shokubai Co., Ltd. “HALS HYBRID (registered trademark)” UV-G720T concentration 40% by mass solution) 16 parts by mass, polyethylene particles a (Mitrone (Mitsui Chemicals) (Registered trademark) "XM-220, viscosity average molecular weight 2 million) 33.6 parts by mass, isocyanate-based crosslinking agent (Nippon Polyurethane Industry Co., Ltd.” Coronate (registered trademark) HL, concentration 75% by mass) 2.7 parts by mass " Then, 87 parts by mass of ethyl acetate was added with stirring to prepare a coating solution.
  • HALS HYBRID registered trademark
  • UV-G720T concentration 40% by mass solution 16 parts by mass
  • polyethylene particles a Mitsubishi Chemicals
  • XM-220 viscosity average molecular weight 2 million
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 80.0% by mass, and the content ratio of the resin is 15.2% by mass.
  • Example 17 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • a benzotriazole-containing acrylic copolymer resin manufactured by Nippon Shokubai Co., Ltd. “Hals Hybrid (registered trademark)” UV-G720T concentration 40% by mass solution
  • polyethylene particles a (“
  • the solid concentration of this coating solution is 30% by mass. Moreover, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 75.0% by mass, and the content ratio of the resin is 20.2% by mass.
  • Example 18 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • HALS HYBRID registered trademark
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 3.0% by mass, and the content ratio of the resin is 92.2% by mass.
  • Example 19 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • ⁇ Resin layer coating solution 94.8 parts by mass of a benzotriazole-containing acrylic copolymer resin (“Hals Hybrid (registered trademark)” UV-G720T concentration 40 mass% solution manufactured by Nippon Shokubai Co., Ltd.), polyethylene particles a (“Mitsui Chemical Co., Ltd.” 1.
  • MIPELON (registered trademark) ”) XM-220, 2.1 parts by mass of viscosity average molecular weight 2 million), isocyanate-based crosslinking agent (Nippon Polyurethane Industry Co., Ltd.“ Coronate (registered trademark) ”HL, concentration 75% by mass) 7 parts by mass and 40 parts by mass of ethyl acetate were added with stirring to prepare a coating solution.
  • the solid concentration of this coating solution is 30% by mass. Further, the content ratio of the particles with respect to 100% by mass of the total solid content contained in the coating solution is 5.0% by mass, and the content ratio of the resin is 90.3% by mass.
  • Example 20 A reflective film was produced in the same manner as in Example 1 except that the following resin layer coating solution was used.
  • Benzotriazole-containing acrylic copolymer resin manufactured by Nippon Shokubai "Hals Hybrid (registered trademark)” UV-G720T concentration 40 mass% solution
  • polyethylene particles a ("Mitsui Chemical Co., Ltd.” MIPERON (registered trademark) “XM-220, viscosity average molecular weight 2 million) 3.4 parts by mass
  • nylon particles SP10 of Toray Industries, Inc.
  • isocyanate-based crosslinking agent Nippon Polyurethane Industry Co., Ltd.“ 2.7 parts by mass of Coronate (registered trademark) “HL, concentration 75% by mass) and 45 parts by mass of ethyl acetate were added with stirring to prepare a coating solution.
  • the solid concentration of this coating solution is 30% by mass.
  • the content ratio of the polyethylene particles a with respect to 100% by mass of the total solid content contained in the coating solution is 8.1% by mass
  • the content ratio of the nylon particles is 5.0% by mass
  • the content ratio of the resin is 82.2% by mass. It is.
  • All of the examples of the present invention had good heat resistance-1 (no heat discoloration) and heat resistance-2 (no heat guide light plate contamination), light guide plate damage and white spots The occurrence of unevenness is suppressed. Moreover, all of the examples of the present invention have good slipping property and coating property.
  • Comparative Example 1 and Comparative Example 2 using low molecular weight (viscosity average molecular weight of 100,000 or less) polyethylene particles are inferior in heat resistance-2 (there is no contamination of the light guide plate due to heat). Moreover, since Comparative Example 1 and 2 are inferior in slipperiness, particle
  • Comparative Example 3 using the crosslinked acrylic particles the light guide plate is poorly damaged.
  • Comparative Example 4 using the crosslinked acrylic particles the light guide plate is inferior in damage, and since the particles having a relatively small average particle diameter are used, white spot unevenness is observed.
  • the reflective film according to the present invention can be used for a backlight of a liquid crystal display device or the like, and is particularly suitable for use in an edge light type backlight unit.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention se rapporte à un film réfléchissant et à une unité de rétroéclairage à éclairage périphérique utilisant ce film réfléchissant caractérisés par l'utilisation d'une couche de résine qui contient des particules de polyoléfine ayant une masse moléculaire moyenne en viscosité d'au minimum 500 000 à l'emplacement d'au moins une surface d'un film de substrat. Il est possible d'obtenir un film réfléchissant et une unité de rétroéclairage à éclairage périphérique qui évitent l'adhérence entre le film réfléchissant et un élément (par exemple une plaque de guidage de lumière) en contact avec ce film réfléchissant, qui peuvent en même temps empêcher les dégâts (les rayures et la contamination de transfert de poudre raclée) causés à l'élément en contact (par exemple une plaque de guidage de lumière) et la contamination de cet élément en contact (par exemple une plaque de guidage de lumière) du fait de la chaleur, et qui présentent une bonne résistance à la chaleur (un faible changement de couleur résultant de la chaleur).
PCT/JP2015/064424 2014-05-30 2015-05-20 Film réfléchissant, et unité de rétroéclairage à éclairage périphérique utilisant ce film réfléchissant WO2015182448A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019093217A1 (fr) * 2017-11-08 2019-05-16 東洋紡株式会社 Film de résine de polyéthylène
US12001044B2 (en) 2021-10-15 2024-06-04 Nichia Corporation Light emitting module and planar light source

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083230A (ja) * 2004-09-14 2006-03-30 Mitsubishi Engineering Plastics Corp 芳香族ポリカーボネート樹脂組成物およびその成形体
JP2009202532A (ja) * 2008-01-30 2009-09-10 Teijin Ltd 多孔膜と金属薄板との積層反射シート
JP2011137060A (ja) * 2009-12-28 2011-07-14 Sumika Styron Polycarbonate Ltd 光反射性に優れた難燃性ポリカーボネート樹脂組成物およびそれからなる成形品
JP2013205599A (ja) * 2012-03-28 2013-10-07 Panasonic Corp 映写用スクリーン及びこれを用いたホワイトボード装置
US20130314796A1 (en) * 2011-02-21 2013-11-28 Kazutoshi Hitomi Light reflection plate

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3683965B2 (ja) * 1995-01-27 2005-08-17 三井化学株式会社 光反射体及びそれを用いた光反射装置
JP4712252B2 (ja) 2001-09-19 2011-06-29 恵和株式会社 反射シート及びこれを用いたバックライトユニット
JP4050564B2 (ja) * 2002-07-23 2008-02-20 ダイセル化学工業株式会社 異方性光散乱シートの製造方法
JP2006023342A (ja) * 2004-07-06 2006-01-26 Seiko Instruments Inc 投影用スクリーン及びこれを用いた画像投影システム
JP4606133B2 (ja) * 2004-07-13 2011-01-05 三菱樹脂株式会社 筆記ボード／反射型スクリーン両用フィルムおよびこれを用いた兼用ボード
JP2008512719A (ja) 2004-09-13 2008-04-24 エスケーシー ハース ディスプレイ フィルムズ カンパニー，リミテッド 反射シートおよびこれを採用したバックライトユニット
JP2006243453A (ja) * 2005-03-04 2006-09-14 Toray Ind Inc スクリーン
JP2007176999A (ja) * 2005-12-27 2007-07-12 Mitsubishi Plastics Ind Ltd 脂肪族ポリエステル系樹脂反射フィルム及び該反射フィルムを備えた反射板
EP2447602B1 (fr) 2006-06-23 2015-05-27 Toray Industries, Inc. Film réfléchissant blanc
JP5391617B2 (ja) * 2007-09-28 2014-01-15 東レ株式会社 白色フィルムおよびそれを用いた面光源
CN101809468B (zh) * 2007-09-28 2011-12-28 东丽株式会社 白色膜以及使用该白色膜的面光源
JP2010044238A (ja) 2008-08-13 2010-02-25 Teijin Dupont Films Japan Ltd 液晶表示装置用反射フィルム
JP5388505B2 (ja) 2008-08-18 2014-01-15 帝人デュポンフィルム株式会社 液晶表示装置用反射フィルム
JP5635229B2 (ja) 2008-10-01 2014-12-03 帝人デュポンフィルム株式会社 液晶表示装置用反射フィルム
JP5564808B2 (ja) * 2009-03-24 2014-08-06 東レ株式会社 白色反射フィルム
WO2011105294A1 (fr) 2010-02-24 2011-09-01 東レ株式会社 Film réfléchissant blanc pour rétroéclairage à éclairage latéral et rétroéclairage utilisant le film précité
JP5744484B2 (ja) 2010-11-15 2015-07-08 帝人デュポンフィルム株式会社 反射フィルム
JP5739178B2 (ja) 2011-01-31 2015-06-24 帝人デュポンフィルム株式会社 反射フィルム
CN103443529A (zh) * 2011-03-29 2013-12-11 东丽株式会社 边光型背光源用白色反射膜及使用其的液晶显示器用背光源

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083230A (ja) * 2004-09-14 2006-03-30 Mitsubishi Engineering Plastics Corp 芳香族ポリカーボネート樹脂組成物およびその成形体
JP2009202532A (ja) * 2008-01-30 2009-09-10 Teijin Ltd 多孔膜と金属薄板との積層反射シート
JP2011137060A (ja) * 2009-12-28 2011-07-14 Sumika Styron Polycarbonate Ltd 光反射性に優れた難燃性ポリカーボネート樹脂組成物およびそれからなる成形品
US20130314796A1 (en) * 2011-02-21 2013-11-28 Kazutoshi Hitomi Light reflection plate
JP2013205599A (ja) * 2012-03-28 2013-10-07 Panasonic Corp 映写用スクリーン及びこれを用いたホワイトボード装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019093217A1 (fr) * 2017-11-08 2019-05-16 東洋紡株式会社 Film de résine de polyéthylène
JPWO2019093217A1 (ja) * 2017-11-08 2020-12-10 東洋紡株式会社 ポリエチレン系樹脂フィルム
JP7200943B2 (ja) 2017-11-08 2023-01-10 東洋紡株式会社 ポリエチレン系樹脂フィルム
US12001044B2 (en) 2021-10-15 2024-06-04 Nichia Corporation Light emitting module and planar light source

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JP2016180991A (ja) 2016-10-13
CN106461822A (zh) 2017-02-22
KR20170012219A (ko) 2017-02-02
JP6232063B2 (ja) 2017-11-15
CN106461822B (zh) 2019-12-13
TWI661936B (zh) 2019-06-11
JPWO2015182448A1 (ja) 2017-04-20
JP6226024B2 (ja) 2017-11-08
TW201545879A (zh) 2015-12-16

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