WO2015020223A1 - 白色反射フィルム - Google Patents

白色反射フィルム Download PDF

Info

Publication number
WO2015020223A1
WO2015020223A1 PCT/JP2014/071129 JP2014071129W WO2015020223A1 WO 2015020223 A1 WO2015020223 A1 WO 2015020223A1 JP 2014071129 W JP2014071129 W JP 2014071129W WO 2015020223 A1 WO2015020223 A1 WO 2015020223A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
layer
film
reflective film
mass
Prior art date
Application number
PCT/JP2014/071129
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
博 楠目
浅井　真人
Original Assignee
帝人デュポンフィルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=52461546&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2015020223(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 帝人デュポンフィルム株式会社 filed Critical 帝人デュポンフィルム株式会社
Priority to KR1020157009589A priority Critical patent/KR101810750B1/ko
Priority to KR1020167027367A priority patent/KR101937007B1/ko
Priority to JP2014560183A priority patent/JP5898345B2/ja
Priority to KR1020177006145A priority patent/KR101973875B1/ko
Priority to CN201480002946.XA priority patent/CN104769461A/zh
Priority to KR1020177018651A priority patent/KR20170081765A/ko
Publication of WO2015020223A1 publication Critical patent/WO2015020223A1/ja

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • G02B5/0825—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only
    • G02B5/0841—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only comprising organic materials, e.g. polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the present invention relates to a white reflective film.
  • it is related with the white reflective film used for a liquid crystal display device.
  • a backlight unit of a liquid crystal display device includes a direct type having a light source on the back of the liquid crystal display panel and a reflective film on the back, and a light guide plate having a reflector on the back of the liquid crystal display panel.
  • a direct type (mainly direct type CCFL) is mainly used from the viewpoint of excellent brightness of a screen and uniformity of brightness in the screen.
  • the type was often used for relatively small LCDs such as notebook PCs, but in recent years, with the development of light sources and light guide plates, the brightness and uniformity of brightness within the screen have been improved even in edge-light type backlight units.
  • edge-light type backlight units have been used not only in relatively small but large LCDs. This is because there is a merit that the LCD can be thinned.
  • the edge light type backlight unit the light guide plate and the reflective film are in direct contact with each other. Therefore, if the light guide plate and the reflective film are attached in such a structure, there is a problem that the luminance of the attached portion becomes abnormal and in-plane variation in luminance occurs. Therefore, it is necessary to have a gap between the light guide plate and the reflective film and keep this gap constant. For example, by having beads on the surface of the reflective film, the gap between the light guide plate and the reflective film can be kept constant, and sticking of these can be prevented.
  • the objective of this invention is providing the white reflective film which can fully suppress sticking with a light-guide plate, and can fully suppress the damage
  • the present invention adopts the following configuration in order to solve the above problems.
  • a white reflective film having a reflective layer A and a surface layer B made of a resin composition containing particles, The surface layer B has protrusions formed of the particles on the surface opposite to the reflective layer A, and the number of protrusions having a height of 5 ⁇ m or more on the surface is 10 4 to 10 10 / m 2 ;
  • the white reflective film, wherein the particles are non-spherical particles having an average particle diameter of 3 to 100 ⁇ m and a 10% compressive strength of 0.1 to 15 MPa. 2.
  • FIG. 1 and 2 are examples of electron micrographs of protrusions formed by non-spherical particles in the present invention.
  • FIG. 3 is a schematic diagram showing a method for evaluating damage of the light guide plate and evaluation of particle dropout according to the present invention.
  • FIG. 4 is a schematic diagram showing a structure used for adhesion spot evaluation in the present invention.
  • the white reflective film of the present invention has a reflective layer A and a surface layer B.
  • the reflective layer A in the present invention is a layer that is composed of a thermoplastic resin and a void forming agent and contains a void forming agent so as to exhibit a white color.
  • the void forming agent will be described in detail later.
  • inorganic particles and a resin that is incompatible with the thermoplastic resin that constitutes the reflective layer A (hereinafter may be referred to as an incompatible resin). Can be used.
  • the reflectance of the reflective layer A at a wavelength of 550 nm is preferably 95% or higher, more preferably 96% or higher, and particularly preferably 97% or higher.
  • the reflection layer A has voids in the layer as described above, and the proportion of the void volume to the volume of the reflection layer A (void volume ratio) is 15% by volume or more and 70% by volume or less. Preferably there is.
  • the improvement effect of a reflectance can be made high and it becomes easy to obtain the above reflectances.
  • the improvement effect of film forming stretchability can be heightened.
  • the void volume ratio in the reflective layer A is more preferably 30% by volume or more, and particularly preferably 40% by volume or more.
  • the void volume ratio in the reflective layer A is more preferably 65% by volume or less, and particularly preferably 60% by volume or less.
  • the void volume ratio can be achieved by adjusting the type, size, and amount of the void forming agent in the reflective layer A.
  • thermoplastic resin examples include thermoplastic resins made of polyester, polyolefin, polystyrene, and acrylic. Among these, polyester is preferable from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability.
  • a polyester comprising a dicarboxylic acid component and a diol component.
  • the dicarboxylic acid component include components derived from terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, adipic acid, sebacic acid, and the like.
  • the diol component include components derived from ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, 1,6-hexanediol, and the like.
  • aromatic polyesters are preferable, and polyethylene terephthalate is particularly preferable.
  • the polyethylene terephthalate may be a homopolymer, but is preferably a copolymer from the viewpoint of suppressing the crystallization when the film is stretched uniaxially or biaxially and improving the film-forming stretchability.
  • the copolymer component include the dicarboxylic acid component and the diol component described above. From the viewpoint of high heat resistance and a high effect of improving film-forming stretchability, an isophthalic acid component and a 2,6-naphthalenedicarboxylic acid component are used. preferable.
  • the proportion of the copolymerization component is, for example, 1 to 20 mol%, preferably 2 to 18 mol%, more preferably 3 to 15 mol%, particularly preferably 7 to 11 based on 100 mol% of the total dicarboxylic acid component of the polyester. Mol%.
  • By making the ratio of a copolymerization component into this range it is excellent in the improvement effect of film forming stretchability. Moreover, it is excellent in thermal dimensional stability.
  • white inorganic particles include barium sulfate, titanium dioxide, silicon dioxide, and calcium carbonate particles.
  • the reflectance of the reflective layer A or the white reflective film may be within a preferable range in the present invention.
  • the void volume ratio in the reflection layer A become the preferable range in this invention.
  • the average particle diameter of the inorganic particles is, for example, 0.2 to 3.0 ⁇ m, preferably 0.3 to 2.5 ⁇ m, and more preferably 0.4 to 2.0 ⁇ m.
  • the content thereof is preferably 20 to 60% by mass, more preferably 25 to 55% by mass, and most preferably 31 to 53% by mass based on the mass of the reflective layer A.
  • the inorganic particles may have any particle shape, for example, a plate shape or a spherical shape.
  • the inorganic particles may be subjected to a surface treatment for improving dispersibility.
  • the incompatible resin is not particularly limited as long as it is incompatible with the thermoplastic resin constituting the layer.
  • thermoplastic resin is polyester, polyolefin, polystyrene, or the like is preferable. These may be in the form of particles.
  • the content should just select an average particle diameter and content so that a white reflective film may have a suitable reflectance similarly to the case of an inorganic particle, These are not specifically limited.
  • the reflectance of the reflective layer A or the white reflective film may be within a preferable range in the present invention.
  • the void volume ratio in the reflection layer A become the preferable range in this invention.
  • the content is preferably 10 to 50% by mass, more preferably 12 to 40% by mass, and most preferably 13 to 35% by mass based on the mass of the reflective layer A.
  • the reflective layer A is made of other components such as UV absorbers, antioxidants, antistatic agents, fluorescent brighteners, waxes, particles and resins different from the void forming agents. Can be contained.
  • the surface layer B in the present invention is a layer made of a resin composition containing particles in a resin and having protrusions formed on the surface by the particles. As such a resin, a thermoplastic resin is preferable. Moreover, you may have a crosslinked structure with a crosslinking agent.
  • thermoplastic resin having a functional group capable of reacting with the reactive group of the crosslinking agent a crosslinked structure of the crosslinking agent and the thermoplastic resin may be formed, or the reactive group of the crosslinking agent and
  • An embodiment having a thermoplastic resin matrix and a crosslinked structure matrix in which a crosslinking agent is crosslinked may be used by using a thermoplastic resin having no functional group capable of reacting.
  • the strength of the surface layer B tends to be improved.
  • the film recoverability tends to be inferior, for example, the amount of unmelted material increases when the film is recovered and regenerated. .
  • the surface layer B can be formed by applying a coating solution during or after the production of the film.
  • the surface layer B may be formed simultaneously with the reflective layer A by employing a coextrusion method or the like.
  • the surface layer B is preferably formed by applying a coating liquid.
  • the content of the crosslinking agent is preferably 35% by mass or less, more preferably 30% by mass or less, still more preferably 25% by mass or less, in particular, based on the solid content constituting the coating liquid from the above viewpoint. Preferably it is 20 mass% or less.
  • thermoplastic resin As the thermoplastic resin constituting the surface layer B, the same thermoplastic resin as the thermoplastic resin constituting the reflective layer A described above can be used. Among these, acrylic and polyester are preferable, and polyester is particularly preferable from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability. As this polyester, the same polyester as the polyester in the reflective layer A described above can be used. Among these polyesters, aromatic polyesters are preferable, and polyethylene terephthalate is particularly preferable from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability.
  • Polyethylene terephthalate may be a homopolymer, but a copolymer is preferable from the viewpoint that the surface layer B is appropriately softened and an effect of suppressing particle dropout is obtained, and copolymerized polyethylene terephthalate is particularly preferable. As a result, even if an external force such as rubbing against the light guide plate is applied, the particles are difficult to drop off.
  • the copolymer component include the dicarboxylic acid component and the diol component described above. From the viewpoint of high heat resistance and a high effect of improving the film-forming stretchability, the isophthalic acid component and the 2,6-naphthalenedicarboxylic acid component. Is preferred.
  • the ratio of the copolymerization component is, for example, 1 to 20 mol%, preferably 2 to 18 mol%, more preferably 3 to 17 mol%, particularly preferably 12 to 16 mol% based on 100 mol% of the total dicarboxylic acid component of the polyester. Mol%.
  • the ratio of a copolymerization component is excellent in the improvement effect of film forming stretchability.
  • it is excellent in thermal dimensional stability.
  • the side chains of these polyesters are used for the purpose of obtaining the above effects and for improving the stability of the coating liquid.
  • the main chain preferably has a group having a function of improving solvophilicity.
  • the group having a function of improving the solvophilicity include a sulfonic acid metal salt group (preferably sulfonic acid sodium salt), a hydroxyl group, an alkyl ether group, and a carboxylate group.
  • the isophthalic acid component having a sulfonic acid metal salt group is particularly preferably 3 to 30 mol%, more preferably 5 to 20 mol%, based on 100 mol% of the total acid component of the polyester.
  • the content is 5 to 15 mol%.
  • Non-spherical particles In the present invention, the particles in the surface layer B are required to be non-spherical particles having an average particle diameter of 3 to 100 ⁇ m. When the average particle diameter is in the above range, it becomes easy to form an aspect of the number of protrusions described later, and it becomes easier to secure a gap. If the average particle size is too large, the particles are likely to fall off, causing a defect on the screen.
  • the average particle size is too small, it is difficult to secure a gap with the light guide plate, which is the original purpose.
  • it is more preferably 5 ⁇ m or more, further preferably 7 ⁇ m or more, particularly preferably 8 ⁇ m or more, more preferably 80 ⁇ m or less, still more preferably 70 ⁇ m or less, and particularly preferably 50 ⁇ m or less.
  • protrusion in the outermost layer surface can increase the damage suppression effect of a light-guide plate, ensuring a gap with a light-guide plate.
  • the non-spherical particles are the maximum particle diameter Dx (assumed to be the x direction) and directions perpendicular to the x direction (the y direction and the z direction.
  • the z direction is also a direction perpendicular to the y direction).
  • Dx the maximum particle diameter
  • Dy and Dz at least one of the maximum diameter differences in these directions (Dx ⁇ Dy, Dx ⁇ Dz, Dy ⁇ Dz) is Dx It shall mean more than 20%. It is considered that the above-described effects can be obtained by such non-spherical particles due to the following mechanism.
  • the shape of the particles is non-spherical, it is considered that the contact area with the light guide plate is widened, and pressure dispersion occurs, so that scratches are less likely to occur.
  • the shape of the particles is non-spherical as defined above, the particles will have a maximum diameter in a certain direction, but when contained in the surface layer B, the maximum diameter direction stochastically takes place on the surface. It tends to be a direction substantially parallel to the surface direction of the layer B. Therefore, the contact area between the protrusions formed from the particles and the light guide plate is widened, and the pressure is dispersed.
  • the present invention has the specific particle mode as described above, so that the light guide plate is brought into contact with the light guide plate while maintaining the number of protrusions rather than concentrating on a narrow range of the apexes of the protrusions.
  • the pressure distribution is achieved, and the number of contact points with the light guide plate is suitable. By doing so, the light guide plate is prevented from being damaged.
  • the light guide plate is brought into contact with only a narrow range of the apexes of the protrusions, and the pressure applied to that portion becomes high, and it becomes easy to scrape.
  • the average aspect ratio (major axis / minor axis) of the particles is 1.31 or more and 1.80 or less. Preferably there is. The aspect ratio is more preferably 1.35 or more, and more preferably 1.75 or less.
  • a larger aspect ratio is preferable for the above effect, but if it is too large, it tends to be difficult to maintain the number of protrusions having a height of 5 ⁇ m or more on the outermost layer surface.
  • an aspect ratio is calculated
  • the maximum diameter of the particles in such observation is the major axis, and the maximum diameter in the direction orthogonal to the maximum diameter is the minor axis.
  • there are moderate variations in the shape of the particles that is, the shapes of the particles are moderately irregular, it is assumed that it is difficult to apply pressure to the specific particles, and it is difficult to damage the light guide plate. .
  • such particles preferably have a standard deviation of aspect ratio of 0.15 to 0.50. That is, this indicates that there is a moderate variation in the shape of each particle.
  • By appropriately varying the shape of the particles forming the protrusions it is possible to further enhance the effect of suppressing damage to the light guide plate while ensuring a gap with the light guide plate. If the variation is small, the effect of improving the gap securing and the suppression of scratches becomes low. On the other hand, even if the variation is too large, defects are likely to occur when added to the surface layer B, and it is difficult to obtain the expected projection frequency, and as a result, it is difficult to achieve the effect of securing gaps and suppressing scratches. Become.
  • the standard deviation of the aspect ratio of the particles is more preferably 0.16 or more, further preferably 0.17 or more, more preferably 0.45 or less, and further preferably 0.43 or less.
  • the 10% compressive strength of the particles is required to be 0.1 to 15 MPa. As a result, a gap can be secured, and damage to the light guide plate can be suppressed. If the compressive strength is too low, it will be deformed too much against stress, making it difficult to ensure the gap with the light guide plate, which is the original purpose. On the other hand, if the compressive strength is too high, the light guide plate is likely to be damaged even with non-spherical particles.
  • the 10% compressive strength is preferably 0.2 MPa or more, more preferably 0.3 MPa or more, further preferably 3 MPa or more, particularly preferably 8 MPa or more, and preferably 14 MPa or less, more preferably 13 MPa.
  • it is more preferably 12 MPa or less.
  • the content of the non-spherical particles in the surface layer B can be appropriately adjusted using the particles having the average particle diameter as described above so as to satisfy the aspect of the number of protrusions described later. For example, when the thickness of the surface layer B tends to be thin with respect to the average particle diameter of the particles, the protrusion may tend to be formed, so the content may be relatively low, and vice versa.
  • the content is preferably larger, and can be appropriately adjusted in consideration of such a tendency.
  • 1 to 70% by mass is preferable based on the mass of the surface layer B, more preferably 5% by mass or more, still more preferably 10% by mass or more, and particularly preferably 20% by mass or more. More preferably, it is 60 mass% or less, More preferably, it is 50 mass% or less, Most preferably, it is 30 mass% or less.
  • the particles contained in the surface layer B may be organic particles, inorganic particles, or organic-inorganic composite particles regardless of their types.
  • polymer particles made of a polymer such as acrylic, polyester, polyurethane, nylon, polyolefin, and polyether are preferable. More preferred are polyester and nylon, and a more suitable 10% compressive strength is easily obtained. Particularly preferred is polyester (especially polyethylene terephthalate), which has an advantage of excellent recovery film-forming properties.
  • the method for achieving the above-mentioned particle shape is not particularly limited, but from the viewpoint of easily obtaining particles having a particularly preferable shape, and from the viewpoint of production cost and productivity, A method of pulverizing the polymer to obtain particles is preferred. The particles obtained by this process are referred to as pulverized polymer particles.
  • such a step is preferably a method in which, after polymerization, for example, the pelletized polymer piece is crystallized, preferably by heat treatment, and pulverized at normal temperature or lower than normal temperature.
  • pulverization is preferably performed at a temperature lower than normal temperature, and a method of cooling with liquid nitrogen is preferable as a method for obtaining such a low temperature.
  • the desired pulverized polymer particles can also be produced by pulverizing a molded polymer composition, a formed polymer film, a formed polymer fiber, and the like.
  • the mode of the polymer to be pulverized in this way including changing the size in the pellet, the thickness in the film, and the diameter in the fiber
  • various non-spherical modes can be obtained.
  • the particles can be obtained, and the variation (standard deviation) in the shape of the particles can be adjusted.
  • the polymer of the pulverized polymer particles may be a copolymer or a blend of two kinds of polymers, and the pulverized polymer particles contain inorganic or organic particles having a smaller diameter, UV absorbers or slip agents. Etc. may be included.
  • the surface layer B made of the resin composition containing the particles as described above forms at least one outermost layer of the white reflective film.
  • the surface layer B that forms the outermost layer has protrusions formed of the particles on the surface opposite to the reflective layer A (hereinafter sometimes referred to as the outermost layer surface).
  • Such protrusions need to have protrusions with an appropriate height at an appropriate frequency on the outermost layer surface from the viewpoint of securing a gap between the light guide plate and the film. Therefore, in the present invention, the number of protrusions having a height of 5 ⁇ m or more (protrusion frequency) is 10 on the outermost layer surface. 4 ⁇ 10 10 Pieces / m 2 Usually it is necessary. Thereby, the gap between the light guide plate and the film can be sufficiently secured, and the sticking suppression effect can be secured. If the projection frequency is too low, the sticking suppression effect is poor.
  • the surface layer B may contain components other than the above-described constituent components as long as the object of the present invention is not impaired. Examples of such components include ultraviolet absorbers, antioxidants, antistatic agents, fluorescent brighteners, waxes, surfactants, particles and resins different from the above particles.
  • the thickness of the reflective layer A in the present invention is preferably 80 to 350 ⁇ m. Thereby, the improvement effect of a reflectance can be made high. If it is too thin, the effect of improving the reflectance is low, while if it is too thick, it is inefficient.
  • the thickness is more preferably 80 to 300 ⁇ m, still more preferably 100 to 320 ⁇ m, and particularly preferably 150 to 250 ⁇ m.
  • the thickness of the surface layer B in the present invention is preferably 5 to 100 ⁇ m. More preferably, it is 5 to 80 ⁇ m.
  • the thickness of the surface layer B is the sum of the particle diameter of the particles and the thickness of the resin portion covering the surface. Further, the thickness of the resin part holding the particles of the surface layer B is preferably 0.2 to 50 ⁇ m. Thereby, it becomes easy to make a protrusion frequency into a preferable aspect, and it becomes easy to ensure a gap with a light-guide plate.
  • the thickness of the resin portion of the surface layer B is too thin, the particles in the protrusions formed on the surface of the surface layer B tend to fall off. On the other hand, if it is too thick, it tends to be difficult to obtain a preferable projection frequency. From this viewpoint, it is more preferably 0.3 ⁇ m or more, further preferably 0.5 ⁇ m or more, particularly preferably 1 ⁇ m or more, most preferably 2 ⁇ m or more, and more preferably 40 ⁇ m or less. Furthermore, when considering drop-off property, 1 ⁇ m or more is preferable, and 2 ⁇ m or more is preferable.
  • the laminated structure of the white reflective film is a two-layer structure of B / A, a three-layer structure of B / A / B, and at least one of B A multilayer configuration of four or more layers arranged in the outermost layer can be exemplified.
  • it further has a support layer C (denoted as C) for stabilizing the film-forming property, and has a three-layer structure of B / C / A and B / A / C, and 4 of B / C / A / C. It is a layer structure.
  • the support layer C is preferably made of the same polyester as the reflective layer A, and has a relatively low void volume ratio (preferably not less than 0% by volume and less than 15% by volume, more preferably not more than 5% by volume, particularly preferably 3) or less) is preferred.
  • the thickness of the support layer C is preferably 5 to 140 ⁇ m, and more preferably 20 to 140 ⁇ m.
  • the present invention in addition to the reflective layer A, the surface layer B, and the support layer C, other layers may be included as long as the object of the present invention is not impaired.
  • it may have a layer for imparting functions such as easy adhesion, winding property (sliding property), antistatic property, electrical conductivity, ultraviolet durability, and a layer for adjusting optical properties. Good.
  • the reflective layer A obtained by a melt extrusion method or the like is applied to a melt resin coating method (including a melt extrusion resin coating method), a co-extrusion method and a lamination method, or a surface layer B.
  • the surface layer B can be formed by a coating liquid coating method using the coating liquid for forming the film.
  • the method of laminating the surface layer B by the coating liquid coating method on the one produced by laminating the reflective layer A and the support layer C by the coextrusion method is particularly preferable.
  • the distribution state of the particles can be easily controlled by changing the drying conditions and the like, and the predetermined number of protrusions can be easily mass-produced at low cost. Further, even particles having a relatively small 10% compressive strength can be easily handled. Furthermore, the shape of the specific particle in the present invention is easily maintained, and the aspect of the protrusion is easily made a preferable aspect.
  • polyester is adopted as the thermoplastic resin constituting the reflective layer A and the thermoplastic resin constituting the support layer C
  • a coextrusion method is adopted as a method of laminating the reflective layer A and the support layer C
  • stacking method is demonstrated, this invention is not limited to this manufacturing method, Moreover, it can manufacture similarly about another aspect with reference to the following.
  • the extrusion step is not included, the following “melt extrusion temperature” may be read as, for example, “melt temperature”.
  • the melting point of the polyester used is Tm (unit: ° C)
  • the glass transition temperature is Tg (unit: ° C).
  • a polyester composition for forming the reflective layer A is prepared by mixing polyester, a void forming agent, and other optional components.
  • a polyester composition for forming the support layer C a mixture of polyester, optionally a void forming agent, and other optional components is prepared. These polyester compositions are used after drying to sufficiently remove moisture.
  • the dried polyester composition is put into separate extruders and melt-extruded.
  • the melt extrusion temperature needs to be Tm or higher, and may be about Tm + 40 ° C.
  • the polyester composition used for the production of the film is filtered using a nonwoven fabric type filter having an average aperture of 10 to 100 ⁇ m made of stainless steel fine wires having a wire diameter of 15 ⁇ m or less. It is preferable. By performing this filtration, it is possible to suppress aggregation of particles that normally tend to aggregate into coarse aggregated particles, and to obtain a film with few coarse foreign matters.
  • the average opening of the nonwoven fabric is preferably 20 to 50 ⁇ m, more preferably 15 to 40 ⁇ m.
  • the filtered polyester composition is extruded in a multilayer state from a die by a simultaneous multilayer extrusion method (coextrusion method) using a feed block in a molten state to produce an unstretched laminated sheet.
  • the unstretched laminated sheet extruded from the die is cooled and solidified with a casting drum to obtain an unstretched laminated film.
  • this unstretched laminated film is heated by roll heating, infrared heating or the like, and stretched in the film forming machine axial direction (hereinafter sometimes referred to as the longitudinal direction or the longitudinal direction or MD) to obtain a longitudinally stretched film. .
  • This stretching is preferably performed by utilizing the difference in peripheral speed between two or more rolls.
  • the film after the longitudinal stretching is then guided to a tenter and stretched in a direction perpendicular to the longitudinal direction and the thickness direction (hereinafter sometimes referred to as a transverse direction or a width direction or TD) to be biaxially stretched.
  • the stretching temperature is preferably a temperature of Tg or more and preferably Tg + 30 ° C. or less of the polyester (preferably the polyester constituting the reflective layer A), excellent in film-forming stretchability, and voids are preferably formed.
  • the stretching ratio is preferably 2.5 to 4.3 times, more preferably 2.7 to 4.2 times in both the vertical direction and the horizontal direction. If the draw ratio is too low, uneven thickness of the film tends to be worsened, and voids tend not to be formed.
  • the second stage in this case, lateral stretching
  • the second stage is made about 10 to 50 ° C. higher than the first stage stretching temperature. Things are preferable. This is due to the fact that the Tg as a uniaxial film is increased due to the orientation in the first stage of stretching.
  • the pre-heat treatment for transverse stretching may start from a temperature higher than Tg + 5 ° C. of the polyester (preferably the polyester constituting the reflective layer A) and gradually increase the temperature.
  • the temperature rise in the transverse stretching process may be continuous or stepwise (sequential), the temperature is usually raised sequentially.
  • the transverse stretching zone of the tenter is divided into a plurality along the film running direction, and the temperature is raised by flowing a heating medium having a predetermined temperature for each zone.
  • the film after biaxial stretching is subsequently subjected to heat-fixing and heat-relaxing treatments in order to obtain a biaxially oriented film.
  • these treatments can also be performed while the film is running. it can.
  • the biaxially stretched film has a constant width or a Tm-20 ° C.
  • the polyester preferably the polyester constituting the reflective layer A
  • heat-treat under a width reduction of 10% or less and heat-set to lower the heat shrinkage rate.
  • the heat treatment temperature is too high, the flatness of the film tends to deteriorate, and the thickness unevenness tends to increase.
  • the thermal shrinkage tends to increase.
  • both ends of the film being held can be cut off, the take-up speed in the film vertical direction can be adjusted, and the film can be relaxed in the vertical direction. As a means for relaxing, the speed of the roll group on the tenter exit side is adjusted.
  • the speed of the roll group is reduced with respect to the film line speed of the tenter, preferably 0.1 to 2.5%, more preferably 0.2 to 2.3%, particularly preferably 0.3.
  • the film is relaxed by carrying out a speed reduction of ⁇ 2.0% (this value is referred to as “relaxation rate”), and the longitudinal heat shrinkage rate is adjusted by controlling the relaxation rate. Further, the width of the film in the horizontal direction can be reduced in the process until both ends are cut off, and a desired heat shrinkage rate can be obtained.
  • a lateral-longitudinal sequential biaxial stretching method may be used in addition to the longitudinal-lateral sequential biaxial stretching method as described above. Moreover, it can also form into a film using a simultaneous biaxial stretching method.
  • the stretching ratio is, for example, 2.7 to 4.3 times, preferably 2.8 to 4.2 times in both the longitudinal direction and the transverse direction.
  • the surface layer B is coated with a coating liquid for forming the surface layer B on the longitudinally stretched film after the longitudinal stretching in the above-described process, and is dried and cured by heat applied in the preheating process, the lateral stretching process, the heat setting process, and the like. It can be formed by the so-called in-line coating method.
  • the coating liquid can be obtained by mixing the components constituting the surface layer B and optionally diluting with a solvent so as to be easily applied. In this case, water is preferable as the solvent, and the amount of the volatile organic solvent described later can be reduced.
  • the method for applying the coating liquid is not particularly limited, but preferred methods include reverse roll coating, gravure coating, die coating, and spray coating.
  • the surface layer B may be formed on a biaxially oriented film obtained by biaxial stretching and heat setting by a so-called offline coating method.
  • the off-line coating method it is difficult to apply high heat to drying because the film is deformed, and therefore, an organic solvent that is usually easily dried is used as the solvent.
  • the in-line coating method is particularly preferable in the present invention.
  • the white reflective film of the present invention can be obtained.
  • the reflectance (reflectance at a wavelength of 550 nm) of the white reflective film of the present invention measured from the surface layer B side is preferably 95% or more, more preferably 96% or more, still more preferably 97% or more, and still more preferably 97. .5% or more, particularly preferably 98% or more.
  • the reflectance is 95% or more or 96% or more, high luminance can be obtained when used in a liquid crystal display device, illumination, or the like.
  • Such reflectivity is set to a preferable mode such as increasing the void volume ratio of the reflective layer A, the thickness of the reflective layer A is increased, the thickness of the surface layer B is decreased, and the like is set as a preferable mode. Etc. can be achieved.
  • luminance measured from the surface layer B side is calculated
  • the reflectance and brightness are values on the surface on the side of the light guide plate when used with the light guide plate in the white reflective film.
  • the amount of volatile organic solvent measured by the method described later is preferably 10 ppm or less.
  • the surface layer B is not formed by a coating method using an organic solvent.
  • a self-recovery raw material is obtained and a film is formed using the self-recovery raw material, a gas mark is less likely to be generated, and film-forming stretchability (recovery film-forming property) is improved. From this viewpoint, it is more preferably 5 ppm or less, further preferably 3 ppm or less, and ideally 0 ppm.
  • Each characteristic value was measured by the following method.
  • An integrating sphere was attached to a spectrophotometer (UV-3101PC manufactured by Shimadzu Corporation), and BaSO 4 The reflectance when the white plate was 100% was measured at a wavelength of 550 nm, and this value was taken as the reflectance. The measurement was performed on the surface on the surface layer B side. In the case where the front and back surfaces have different surface layers B, the measurement was performed on the surface layer B surface on the light guide plate side.
  • the z direction is also perpendicular to the y direction)
  • the maximum diameters Dy and Dz (where Dy ⁇ Dz) are calculated, and average values are calculated for each, and Dxave, Dave, Dzave, and Dxave-Dave, Dxave-Dzave, Dyave-Dzave are obtained. When at least one of these exceeded 20% of Dx, it was determined as non-spherical, and when it was not, it was determined as spherical.
  • Particle shape 2 (aspect ratio and standard deviation of aspect ratio) Lightly affix the particles to the conductive tape using a glass rod, fix it to the measurement stage, and use the S-4700 field emission scanning electron microscope manufactured by Hitachi, Ltd.
  • the maximum diameter in the direction perpendicular to the maximum diameter is defined as the major axis, and the major axis / minor axis ( (Aspect ratio) was determined and the average value was taken as the average aspect ratio.
  • the standard deviation of the aspect ratio was calculated from each aspect ratio value.
  • the magnification was made high (for example, 1000 times), and it observed.
  • Projection frequency on the film surface (number of protrusions)
  • the projection profile on the film surface was measured with a three-dimensional roughness measuring device SE-3CKT (manufactured by Kosaka Laboratory Ltd.) with a cutoff of 0.25 mm, a measurement length of 1 mm, a scanning pitch of 2 ⁇ m, and a scanning number of 100.
  • the projection profile was recorded at a height magnification of 1000 times and a scanning direction magnification of 200 times. From the obtained projection profile (horizontal axis: projection height, vertical axis: projection profile of the number of projections), the number of projections having a height of 5 ⁇ m or more (pieces / m 2 ) was calculated as the protrusion frequency.
  • a three-dimensional roughness analyzer SPA-11 manufactured by Kosaka Laboratory Ltd.
  • Void volume fraction 100 ⁇ (1 ⁇ (actual density / calculated density))
  • the density of isophthalic acid copolymerized polyethylene terephthalate (after biaxial stretching) is 1.39 g / cm. 3
  • the density of barium sulfate is 4.5 g / cm 3 It was. Moreover, only the layer which measures a void volume ratio was isolated, the mass per unit volume was calculated
  • volume is 3cm in area of sample 2
  • the thickness at that size was measured at 10 points with an electric micrometer (K-402B manufactured by Anritsu), and the average value was calculated as area ⁇ thickness.
  • the mass was weighed with an electronic balance.
  • the specific gravity of the particles including aggregated particles
  • the value of bulk specific gravity obtained by the following graduated cylinder method was used. Fill a 1000 ml measuring cylinder with completely dry particles, measure the total weight, subtract the weight of the measuring cylinder from the total weight to obtain the weight of the particle, and measure the volume of the measuring cylinder. , The weight (g) of the particles to the volume (cm 3 ).
  • the 25 mm portion remaining at both ends in the width direction of the reflective film is folded back to the back side of the iron plate, and the end portion of the reflective film (the portion where the blade is inserted with a knife or the like at the time of sampling) has the effect of scraping the light guide plate. Eliminated.
  • a light guide plate (4, having a size of at least 400 mm ⁇ 200 mm) with a dot surface having dots (401) is fixed on a horizontal desk, and the reflection film fixed on the iron plate created above is evaluated.
  • the biaxially stretched film obtained in the examples was pulverized, melt-extruded, and formed into chips to prepare a self-recovery raw material.
  • a self-recovered raw material is added to the reflective layer A in an amount of 35% by mass based on the mass of the reflective layer A, and the mass ratio of the remaining polyester to the void forming agent is the same as that of the original film.
  • a biaxially stretched film containing a self-recovery raw material was prepared in the same manner as the above film and evaluated according to the following criteria.
  • ⁇ The film can be stably formed with a length of 1000 m or more and less than 2000 m.
  • ⁇ Production Example 2 Synthesis of isophthalic acid copolymerized polyethylene terephthalate 2> Except for changing to 129.0 parts by mass of dimethyl terephthalate and 21.0 parts by mass of dimethyl isophthalate (14 mol% with respect to 100 mol% of the total acid component of the resulting polyester), the same as in Production Example 1 above. Thus, isophthalic acid copolymerized polyethylene terephthalate 2 was obtained. The melting point of this polymer was 215 ° C.
  • ⁇ Production Example 3 Preparation of particle master chip 1> Part of the isophthalic acid copolymerized polyethylene terephthalate 1 obtained above and barium sulfate particles having an average particle diameter of 1.0 ⁇ m as a void forming agent (in the table, BaSO 4 Is written. ) Using a NEX-T60 tandem extruder manufactured by Kobe Steel, so that the content of barium sulfate particles is 60% by mass with respect to the mass of the obtained master chip, and the resin temperature is set to 260 ° C. To produce a particle master chip 1 containing barium sulfate particles.
  • ⁇ Production Example 4 Preparation of particle master chip 2> Using a part of the isophthalic acid copolymerized polyethylene terephthalate 2 obtained above and barium sulfate particles having an average particle size of 1.0 ⁇ m as a void forming agent, a NEX-T60 tandem extruder manufactured by Kobe Steel was used. The mixture was mixed so that the content of barium sulfate particles was 60% by mass with respect to the mass of the master chip, and extruded at a resin temperature of 260 ° C. to prepare particle master chip 2 containing barium sulfate particles.
  • ⁇ Production Example 5 Creation of particles 1 used for surface layer B> 150 parts by mass of dimethyl terephthalate, 98 parts by mass of ethylene glycol, 1.0 part by mass of diethylene glycol, 0.05 part by mass of manganese acetate, 0.012 part by mass of lithium acetate were charged into a rectifying column and a flask equipped with a distillation condenser. While stirring, the mixture was heated to 150 to 240 ° C. to distill off methanol and conduct transesterification. After methanol was distilled, 0.03 parts by mass of trimethyl phosphate and 0.04 parts by mass of germanium dioxide were added, and the reaction product was transferred to the reactor.
  • polyester particles having an average particle diameter of 60 ⁇ m were obtained. Furthermore, particles 1 (non-spherical particles) having an average particle diameter of 40 ⁇ m were obtained by air classification of the polyester particles.
  • Particle 2 Non-spherical particles having an average particle size of 40 ⁇ m obtained by pulverization and classification in the same manner as in Production Example 5 except that pellets of nylon 66 resin CM3006 manufactured by Toray Industries, Inc. are used.
  • Particle 3 Non-spherical particles having an average particle diameter of 10 ⁇ m obtained by pulverization and classification in the same manner as in Production Example 5 except that pellets of nylon 66 resin CM3006 manufactured by Toray Industries, Inc. are used.
  • Particle 4 Non-spherical particles having an average particle diameter of 10 ⁇ m obtained by pulverization and classification in the same manner as in Production Example 5 except that pellets of nylon 6 resin CM1017 manufactured by Toray Industries, Inc. are used.
  • Particle 5 MBX-40 manufactured by Sekisui Plastics Co., Ltd. (true spherical acrylic particles, average particle size 40 ⁇ m)
  • Particle 6 Non-spherical particle having an average particle diameter of 10 ⁇ m obtained by pulverization and classification in the same manner as in Production Example 5 except that a pellet of poly (methyl methacrylate) (PMMA) resin Sumipex MGSS manufactured by Sumitomo Chemical Co., Ltd. is used. .
  • Particle 7 SP-10 manufactured by Toray Industries, Inc.
  • ⁇ Production Example 7 Creation of particles 9 used for surface layer B> Using the pellets obtained in Production Example 6 above, the conditions normally used for a biaxially stretched film of polyethylene terephthalate (longitudinal stretch ratio: 3.0 times, transverse stretch ratio: 4.0 times, heat setting temperature set at 220 ° C.) Thus, a transparent biaxially stretched polyethylene terephthalate film (thickness: 50 ⁇ m) was obtained. This was pulverized while cooling with liquid nitrogen in the same manner as in Production Example 6 above, followed by air classification to obtain particles 9 (non-spherical particles) having an average particle diameter of 52 ⁇ m.
  • ⁇ Production Example 8 Creation of particles 10 used for surface layer B> Using the pellets obtained in Production Example 6 above, polyester fibers having a diameter of 35 ⁇ m were prepared by a conventional method, and this was crushed while cooling with liquid nitrogen in the same manner as in Production Example 6 to obtain particles 10 having an average particle diameter of 40 ⁇ m. (Non-spherical particles) were obtained.
  • ⁇ Production Examples 9 and 10 Creation of particles 11 and 12 used for surface layer B> The pellets obtained in Production Example 6 were dried and crystallized, similarly pulverized, and subjected to air classification to obtain particles 11 (non-spherical particles) having an average particle diameter of 35 ⁇ m.
  • the film obtained in Production Example 7 was similarly crushed and subjected to air classification to obtain particles 12 (non-spherical particles) having an average particle diameter of 50 ⁇ m.
  • the air classification conditions were adjusted so that the particles obtained would be in the form shown in Table 3.
  • Particle 13 Non-spherical particle having an average particle diameter of 40 ⁇ m obtained by pulverization and classification in the same manner as in Production Example 6 except that pellets of poly (methyl methacrylate) (PMMA) resin Sumipex MGSS manufactured by Sumitomo Chemical Co., Ltd. are used. .
  • ⁇ Production Examples 11 and 12 Creation of particles 14 and 15 used for the surface layer B>
  • the film thickness was changed to 75 ⁇ m, and pulverization and air classification were performed in the same manner as in Production Example 7 to obtain particles 14 (non-spherical particles).
  • the film thickness was set to 100 ⁇ m, and similarly, particles 15 (non-spherical particles) were obtained.
  • the air classification conditions were adjusted so that the particles obtained would be in the form shown in Table 3.
  • ⁇ Production Examples 13 to 20 Creation of particles 16 to 23 used for the surface layer B>
  • the pellets obtained in Production Example 6 were dried and crystallized, similarly crushed, and subjected to air classification to obtain particles 16 to 23 (non-spherical particles or spherical particles) each having the structure shown in Table 3.
  • the air classification conditions were adjusted so that the particles obtained would be in the form shown in Table 3.
  • Example 1-1 Manufacture of white reflective film
  • the reflective layer A is used so that the content of the void forming agent is 49% by mass with respect to the mass of the reflective layer A, and the supporting layer C is 3% by mass of the void forming agent with respect to the mass of the supporting layer C.
  • the layer A is melt extruded at a temperature of 255 ° C.
  • the layer C is melt extruded at a temperature of 230 ° C.
  • the layer configuration is C layer / A layer / C layer.
  • a three-layer feed block device and the sheet was formed into a sheet from a die while maintaining the laminated state. At this time, it adjusted with the discharge amount of each extruder so that the thickness ratio of C layer / A layer / C layer might become 10/80/10 after biaxial stretching. Further, this sheet was an unstretched film cooled and solidified with a cooling drum having a surface temperature of 25 ° C. This unstretched film is led to a longitudinal stretching zone maintained at 92 ° C.
  • Polymerized polyester is resin 1.
  • the film was guided to a transverse stretching zone maintained at 130 ° C. through a preheating zone at 115 ° C.
  • Example 1-4 The void forming agent of the reflective layer A was changed to a resin incompatible with polyester (cycloolefin, “TOPAS 6017S-04” manufactured by Polyplastics Co., Ltd.), and the content of the void forming agent with respect to the mass of the reflective layer A was 20 A biaxially stretched film was prepared and evaluated in the same manner as in Example 1-1 except that the mass% was used. The evaluation results are shown in Table 2. [Example 1-6] After the uniaxial stretching, the following surface layer (layer) was formed on the biaxially stretched film obtained in the same manner as in Example 1-1 except that the coating solution was not applied before the biaxial stretching.
  • a coating liquid having the composition shown in the coating liquid 2 for forming B) is applied with a wet thickness of 15 g / m. 2 Then, the film was dried in an oven at 80 ° C. to obtain a film.
  • Example 2-1 Manufacture of white reflective film
  • the reflective layer A is used so that the content of the void forming agent is 49% by mass with respect to the mass of the reflective layer A, and the supporting layer C is 3% by mass of the void forming agent with respect to the mass of the supporting layer C.
  • the layer A is melt extruded at a temperature of 265 ° C.
  • the layer C is melt extruded at a temperature of 240 ° C.
  • the layer configuration is C layer / A layer / C layer.
  • a three-layer feed block device and the sheet was formed into a sheet from a die while maintaining the laminated state. At this time, it adjusted with the discharge amount of each extruder so that the thickness ratio of C layer / A layer / C layer might become 10/80/10 after biaxial stretching. Further, this sheet was an unstretched film cooled and solidified with a cooling drum having a surface temperature of 25 ° C. This unstretched film is led to a longitudinal stretching zone maintained at 92 ° C.
  • the film was guided to a transverse stretching zone maintained at 130 ° C. through a preheating zone at 115 ° C. while holding both ends with clips, and stretched 3.6 times in the transverse direction. Then, heat setting is performed at 185 ° C.
  • Example 4 shows the evaluation results of the obtained film.
  • Examples 2-2 to 2-5, 2-8 to 2-15, Comparative Examples 2-1 to 2-5 A biaxially stretched film was obtained in the same manner as in Example 2-1, except that the aspect and layer structure of the particles used for the surface layer (B layer) were as shown in Table 3 and Table 4, respectively. Table 4 shows the evaluation results of the obtained film.
  • Example 2-6 The void forming agent of the reflective layer A was changed to a resin incompatible with polyester (cycloolefin, “TOPAS 6017S-04” manufactured by Polyplastics Co., Ltd.), and the content of the void forming agent with respect to the mass of the reflective layer A was 20 A biaxially stretched film was prepared and evaluated in the same manner as in Example 2-1, except that the mass% was used. The evaluation results are shown in Table 4. [Example 2-7] After the uniaxial stretching, the following surface layer (layer) was formed on the biaxially stretched film obtained in the same manner as in Example 2-1, except that the coating solution was not applied before the biaxial stretching.
  • a coating liquid having the composition shown in the coating liquid 4 for forming B) is applied with a wet thickness of 15 g / m. 2 Then, the film was dried in an oven at 80 ° C. to obtain a film.
  • Crosslinking agent Coronate HL (crosslinking agent 1) manufactured by Nippon Polyurethane Industry Co., Ltd. 10% by mass Diluting solvent: butyl acetate 52.5% by mass
  • the evaluation results of the obtained film were as shown in Table 4.
  • the solid content ratio of each component in the coating liquid 4 is as follows. ⁇ Particles: 25% by mass -Acrylic resin (thermoplastic resin): 50% by mass ⁇ Crosslinking agent: 25% by mass.
  • the invention's effect ADVANTAGE OF THE INVENTION According to this invention, the white reflective film which can fully suppress sticking with a light-guide plate, and can fully suppress the damage
  • the white reflective film of the present invention can sufficiently suppress sticking to the light guide plate and sufficiently suppress scratches on the light guide plate, in particular, as a surface light source reflector including the light guide plate, for example, It can be suitably used as a reflective film used in an edge light type backlight unit used in a liquid crystal display device or the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
PCT/JP2014/071129 2013-08-07 2014-08-04 白色反射フィルム WO2015020223A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020157009589A KR101810750B1 (ko) 2013-08-07 2014-08-04 백색 반사 필름
KR1020167027367A KR101937007B1 (ko) 2013-08-07 2014-08-04 백색 반사 필름
JP2014560183A JP5898345B2 (ja) 2013-08-07 2014-08-04 白色反射フィルム
KR1020177006145A KR101973875B1 (ko) 2013-08-07 2014-08-04 백색 반사 필름
CN201480002946.XA CN104769461A (zh) 2013-08-07 2014-08-04 白色反射膜
KR1020177018651A KR20170081765A (ko) 2013-08-07 2014-08-04 백색 반사 필름

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013164228 2013-08-07
JP2013-164228 2013-08-07

Publications (1)

Publication Number Publication Date
WO2015020223A1 true WO2015020223A1 (ja) 2015-02-12

Family

ID=52461546

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/071129 WO2015020223A1 (ja) 2013-08-07 2014-08-04 白色反射フィルム

Country Status (5)

Country Link
JP (3) JP5898345B2 (zh)
KR (4) KR101973875B1 (zh)
CN (3) CN107272091A (zh)
TW (3) TWI619607B (zh)
WO (1) WO2015020223A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017018280A1 (ja) * 2015-07-24 2017-02-02 帝人フィルムソリューション株式会社 白色反射フィルム
JP2017090929A (ja) * 2013-08-07 2017-05-25 帝人フィルムソリューション株式会社 白色反射フィルムおよびその製造方法
WO2017131030A1 (ja) * 2016-01-26 2017-08-03 東レ株式会社 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
JP2020027218A (ja) * 2018-08-16 2020-02-20 楷威電子股▲分▼有限公司 光学フィルム及びそれを応用したバックライトモジュール

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017195352A (ja) * 2016-04-14 2017-10-26 大日本印刷株式会社 発光ダイオード実装モジュール
JP2017199737A (ja) * 2016-04-25 2017-11-02 大日本印刷株式会社 発光ダイオード実装モジュール、発光ダイオード実装モジュール用光反射部材
KR102004088B1 (ko) 2018-03-06 2019-07-25 도레이첨단소재 주식회사 백색 폴리에스테르 반사필름 및 이를 이용한 반사 시트 및 이의 제조방법
KR102033033B1 (ko) * 2018-08-24 2019-10-16 주식회사 퓨엠 광학 비드 제조 방법, 이에 의해 제조된 광학 비드, 광학 비드를 포함하는 반사 필름, 및 반사 필름을 포함하는 광원 어셈블리
KR102285669B1 (ko) 2018-08-27 2021-08-04 동우 화인켐 주식회사 컬러 필터, 그 제조 방법, 및 컬러 필터를 포함하는 화상표시장치
CN112297552A (zh) * 2019-07-31 2021-02-02 宁波长阳科技股份有限公司 一种白色反射聚酯薄膜
CN110297341A (zh) * 2019-08-02 2019-10-01 京东方科技集团股份有限公司 调光膜、背光模组、显示装置
CN111552114A (zh) 2020-03-24 2020-08-18 京东方科技集团股份有限公司 背光模组及显示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005181492A (ja) * 2003-12-17 2005-07-07 Matsushita Electric Ind Co Ltd 光透過性シート及びこれを用いたタッチパネル
WO2011105294A1 (ja) * 2010-02-24 2011-09-01 東レ株式会社 エッジライト型バックライト用白色反射フィルム及びそれを用いたバックライト
JP2012108190A (ja) * 2010-11-15 2012-06-07 Teijin Dupont Films Japan Ltd 反射フィルム
JP2012159610A (ja) * 2011-01-31 2012-08-23 Teijin Dupont Films Japan Ltd 反射フィルム
JP2013041021A (ja) * 2011-08-12 2013-02-28 Teijin Dupont Films Japan Ltd 白色反射フィルム

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08278415A (ja) * 1995-04-07 1996-10-22 Taiho Ind Co Ltd 液晶パネル用バックライト及び反射シート
JP2000162439A (ja) * 1998-11-26 2000-06-16 Nitto Denko Corp 偏光板
JP2000302624A (ja) * 1999-04-22 2000-10-31 Sekisui Plastics Co Ltd アクリル酸エステル系樹脂粒子及びそれを含む外用剤
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
JP2003279714A (ja) * 2002-03-20 2003-10-02 Mitsui Chemicals Inc 反射体およびそれを用いたサイドライト型バックライト装置および液晶表示装置
JP4259029B2 (ja) * 2002-03-20 2009-04-30 住友化学株式会社 マイクロパウダーおよびその製造方法
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
CN101631986A (zh) * 2007-03-22 2010-01-20 木本股份有限公司 背光装置及部件
JP2008239734A (ja) * 2007-03-27 2008-10-09 Sekisui Plastics Co Ltd 合成樹脂粒子、並びに、この合成樹脂粒子を用いた光学材料、塗料、化粧料及び合成樹脂シート
KR101260102B1 (ko) * 2007-05-08 2013-05-02 도레이 카부시키가이샤 백색 반사 필름
JP2009244509A (ja) 2008-03-31 2009-10-22 Mitsubishi Rayon Co Ltd 反射シート
JP2011168680A (ja) * 2010-02-17 2011-09-01 Kobe Univ 半球状微粒子の製造方法
DE102011111145A1 (de) * 2011-08-20 2013-02-21 Clariant International Ltd. Druckfarbensysteme
JP6014979B2 (ja) * 2011-09-26 2016-10-26 住友大阪セメント株式会社 光拡散膜形成用樹脂組成物とその製造方法、光拡散膜、光拡散反射部材、光拡散透過部材、光学素子
JP5898345B2 (ja) * 2013-08-07 2016-04-06 帝人デュポンフィルム株式会社 白色反射フィルム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005181492A (ja) * 2003-12-17 2005-07-07 Matsushita Electric Ind Co Ltd 光透過性シート及びこれを用いたタッチパネル
WO2011105294A1 (ja) * 2010-02-24 2011-09-01 東レ株式会社 エッジライト型バックライト用白色反射フィルム及びそれを用いたバックライト
JP2012108190A (ja) * 2010-11-15 2012-06-07 Teijin Dupont Films Japan Ltd 反射フィルム
JP2012159610A (ja) * 2011-01-31 2012-08-23 Teijin Dupont Films Japan Ltd 反射フィルム
JP2013041021A (ja) * 2011-08-12 2013-02-28 Teijin Dupont Films Japan Ltd 白色反射フィルム

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017090929A (ja) * 2013-08-07 2017-05-25 帝人フィルムソリューション株式会社 白色反射フィルムおよびその製造方法
WO2017018280A1 (ja) * 2015-07-24 2017-02-02 帝人フィルムソリューション株式会社 白色反射フィルム
JPWO2017018280A1 (ja) * 2015-07-24 2018-03-01 帝人フィルムソリューション株式会社 白色反射フィルム
CN107850702A (zh) * 2015-07-24 2018-03-27 帝人薄膜解决方案有限公司 白色反射膜
CN107850702B (zh) * 2015-07-24 2020-05-12 帝人薄膜解决方案有限公司 白色反射膜
WO2017131030A1 (ja) * 2016-01-26 2017-08-03 東レ株式会社 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
JP2020027218A (ja) * 2018-08-16 2020-02-20 楷威電子股▲分▼有限公司 光学フィルム及びそれを応用したバックライトモジュール

Also Published As

Publication number Publication date
JP6185537B2 (ja) 2017-08-23
KR20170029023A (ko) 2017-03-14
JP6404962B2 (ja) 2018-10-17
CN104769461A (zh) 2015-07-08
JP2016027429A (ja) 2016-02-18
JP2017090929A (ja) 2017-05-25
TWI629172B (zh) 2018-07-11
TW201722735A (zh) 2017-07-01
TW201518101A (zh) 2015-05-16
KR20150058336A (ko) 2015-05-28
KR101937007B1 (ko) 2019-01-09
KR101973875B1 (ko) 2019-04-29
KR20170081765A (ko) 2017-07-12
CN107315209A (zh) 2017-11-03
CN107315209B (zh) 2020-01-14
KR20160119277A (ko) 2016-10-12
KR101810750B1 (ko) 2017-12-19
TWI619607B (zh) 2018-04-01
TW201726415A (zh) 2017-08-01
JP5898345B2 (ja) 2016-04-06
JPWO2015020223A1 (ja) 2017-03-02
TWI589440B (zh) 2017-07-01
CN107272091A (zh) 2017-10-20

Similar Documents

Publication Publication Date Title
JP6404962B2 (ja) 白色反射フィルムおよびその製造方法
JP5926512B2 (ja) 白色反射フィルム
JP6211923B2 (ja) 白色反射フィルム
JP6211918B2 (ja) 白色反射フィルム
JP6110220B2 (ja) 白色反射フィルム
JP6336266B2 (ja) 白色反射フィルム
JP5722937B2 (ja) 白色反射フィルム
JP6211917B2 (ja) 白色反射フィルム
JP2015069020A (ja) 白色反射フィルム
WO2014129673A1 (ja) 白色反射フィルム
JP6363334B2 (ja) 白色反射フィルム
JP5785202B2 (ja) 白色反射フィルム
JP6235299B2 (ja) 白色反射フィルム
JP6352613B2 (ja) 白色反射フィルム
JPWO2017018280A1 (ja) 白色反射フィルム
JP5702482B2 (ja) 白色反射フィルム
JP5495345B2 (ja) 白色反射フィルム

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2014560183

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14835220

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20157009589

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14835220

Country of ref document: EP

Kind code of ref document: A1