WO2008053740A1 - Film de polyester blanc pour réflecteur d'écran à cristaux liquides - Google Patents

Film de polyester blanc pour réflecteur d'écran à cristaux liquides Download PDF

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Publication number
WO2008053740A1
WO2008053740A1 PCT/JP2007/070583 JP2007070583W WO2008053740A1 WO 2008053740 A1 WO2008053740 A1 WO 2008053740A1 JP 2007070583 W JP2007070583 W JP 2007070583W WO 2008053740 A1 WO2008053740 A1 WO 2008053740A1
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WO
WIPO (PCT)
Prior art keywords
polyester film
film
polyester
liquid crystal
crystal display
Prior art date
Application number
PCT/JP2007/070583
Other languages
English (en)
Japanese (ja)
Inventor
Masahiro Okuda
Hideki Fujii
Kazunori Tanaka
Original Assignee
Toray Industries, Inc.
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
Application filed by Toray Industries, Inc. filed Critical Toray Industries, Inc.
Priority to KR1020087028950A priority Critical patent/KR101186833B1/ko
Priority to CN2007800323665A priority patent/CN101512394B/zh
Priority to JP2007558371A priority patent/JP5526477B2/ja
Publication of WO2008053740A1 publication Critical patent/WO2008053740A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/044—Forming conductive coatings; Forming coatings having anti-static properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—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
    • G02B5/0247—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of voids or pores
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers

Definitions

  • the present invention relates to a white polyester film, and more particularly to a white polyester film that is optimal as a reflector for a liquid crystal display. More specifically, a brighter screen can be obtained by illuminating the LCD screen with a sidelight (also called edge light) or by arranging a fluorescent tube directly above the reflective film (called a direct type).
  • the present invention relates to a white polyester film for a display reflector that can constitute a substrate for a reflector.
  • the sidelight system is a system in which a transparent substrate such as an acrylic plate with a certain thickness is subjected to various treatments such as halftone dot printing and embossing, and light from a cold cathode tube is applied to the edge of the acrylic plate. Illumination light is evenly distributed, and a screen with uniform brightness is obtained. In addition, since the lighting is installed at the edge portion connecting the back of the screen, it can be made thinner than the backlight method.
  • cold cathode ray tubes are arranged in parallel at the bottom of the liquid crystal screen.
  • the reflector may be a flat plate or a cold cathode ray tube formed into a semicircular concave shape.
  • a film added with a white pigment, a film containing fine bubbles inside, or a film obtained by bonding these films to a metal plate, a plastic plate, or the like has been used. Improved brightness, especially when using a film containing fine bubbles inside Excellent effect and uniformity (Patent Document 2)
  • the formation of such fine bubbles is achieved by dispersing inorganic particles such as a high melting point incompatible polymer or barium sulfate in a film base material such as polyester and stretching it (for example, biaxially). This is achieved by stretching. During stretching, voids (bubbles) are formed around the incompatible polymer particles, which exert a scattering action on the light, so that it is whitened and a high reflectivity can be obtained.
  • inorganic particles such as a high melting point incompatible polymer or barium sulfate
  • a film base material such as polyester
  • Patent Document 2 aims to ensure the reflectance of light having a wavelength of 400 to 700 nm and to improve the reflectance of light having a wavelength of less than 400 nm, and the cavity-containing film contains a fluorescent brightening agent. Take the structure to make it happen.
  • Patent Document 3 discloses a void-containing polyester film containing a light stabilizer in order to ensure stability.
  • the biaxially stretched polyester film has a problem in that dust is attached to the film during the film forming process, the heating process and the use as soon as static electricity is generated.
  • the dust greatly affects the manufacturing loss. Therefore, there is an increasing demand for antifouling properties for each member during the liquid crystal monitor manufacturing process in which the polyester film is used.
  • Patent Document 4 obtains an antifouling effect by imparting antistatic properties to the film.
  • the film provided in Patent Document 4 cannot be applied to a liquid crystal display device that requires light stability, and an optical film having both light stability and antifouling properties is required.
  • Patent Document 1 JP 63 62104 A
  • Patent Document 2 Japanese Patent Laid-Open No. 239540
  • Patent Document 3 Japanese Patent Laid-Open No. 2002-098808 Patent Document 4: JP-A-10-278204
  • the deterioration of the member is promoted by the ultraviolet rays emitted from the fluorescent tube, and in the long-term use, the temperature and humidity conditions in the liquid crystal unit and the like are greatly changed. Due to the difference in rate, the members may be distorted. At this time, if the contact area of the members is large, the members are rubbed with each other when distortion occurs. When this squeak is repeated, deterioration of the member is promoted, and the characteristics deteriorate from scratches caused by rubbing. Moreover, the loss due to the adhesion of dust in the manufacturing and assembly process is also large.
  • the present invention has the following configuration. That is,
  • a white polyester film for a liquid crystal display reflector which contains a light stabilizer in a polyester film having fine bubbles and has an average reflectance of 97% or more on at least one surface of the film.
  • a layer (C) containing an antistatic agent is applied to at least one surface of the polyester film, and the surface specific resistance value of the layer (C) is IX 10 13 ⁇ / mouth or less (1) or ( The polyester film for a liquid crystal display reflector as described in 2).
  • the white polyester film for a liquid crystal display reflector according to any one of (1) to (5), which is a light stabilizer of a malonate ester, contained in the polyester film. .
  • liquid crystal display reflector according to any one of (1) to (6), which is a light stabilizer strength S, 2,6-naphthalenedicarboxylic acid or a copolymer thereof contained in the polyester film.
  • White polyester film is a light stabilizer strength S, 2,6-naphthalenedicarboxylic acid or a copolymer thereof contained in the polyester film.
  • the polyester film contains titanium dioxide particles, and the content thereof is 1% by weight or more and 40% by weight or less based on the total weight of the polyester film.
  • V a white polyester film for a liquid crystal display reflector according to any one of the above.
  • the polyester film contains particles having an average particle size of 1. O ⁇ m or more (hereinafter referred to as large particle size particles), and the content thereof is 0.01% by weight with respect to the total weight of the polyester film.
  • the white polyester film for a liquid crystal display reflector according to any one of (1) to (8), wherein the content is 5% by weight or less.
  • the polyester resin incompatible with the polyester is polymethylpentene, the average particle size in the polyester film is equal to or less than the average particle size of the large particles, and the total weight of the polyester film
  • the inorganic particles contained to form the fine bubbles are barium sulfate, and the barium sulfate has an average particle size of 0.1, 1 m or more, 5.0, 1 m or less, and a large particle size
  • the present invention it is possible to obtain a white polyester film for a liquid crystal display reflecting plate having both light stability, antifouling property and low rubbing property.
  • the polyester film and other components incorporated in the liquid crystal panel can be obtained.
  • the durability of the peripheral members can be improved, and the production loss due to adhesion of foreign matters can be reduced.
  • the polyester film of the present invention needs to contain a light stabilizer in the polyester film having fine bubbles.
  • the polyester film of the present invention may be either a single layer or a multilayer.
  • the polyester layer (A) is a layer containing fine bubbles
  • the polyester layer (B) is a layer containing a light stabilizer on at least one side thereof. Is preferable in terms of high reflectivity, film-forming properties, optical properties, and light stability.
  • the polyester film of the present invention preferably has a structure in which the polyester layer (B) containing a light stabilizer is laminated on at least one side of the polyester layer (A) having fine bubbles. ! /, (This stacking mode is hereinafter referred to as “mode 1”).
  • a layer containing an antistatic layer on at least one side of the polyester film of the present invention ( c)
  • the polyester film of the present invention may be composed of a number of layers as long as it includes the structure of the polyester layer (A) and the polyester layer (B).
  • it may have a structure of five layers or more.
  • a two-layer structure or a three-layer structure comprising a polyester layer (B) / polyester layer (A) / polyester layer (B) is preferred! /.
  • a form in which the polyester layer (B) is protected by the polyester layer (B) that is, a three-layer structure of polyester layer (B) / polyester layer (A) / polyester layer (B) is preferable.
  • the core layer portion is a polyester layer (A) and the surface layer portion on one or both sides is a polyester layer (B).
  • the polyester constituting the present invention is a polymer obtained by condensation polymerization from a diol and a dicarboxylic acid.
  • the dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, adipic acid, sebacic acid, and the like.
  • the diol is represented by ethylene glycol, trimethylene glycol, tetramethylene glycol, cyclohexane dimethanol and the like.
  • polymethylene terephthalate examples include polymethylene terephthalate, polytetramethylene terephthalate, polyethylene p-oxybenzoate, poly 1,4-cyclohexylene dimethylene terephthalate, polyethylene 2,6-naphthalenedicarboxylate, and the like.
  • polyethylene terephthalate hereinafter sometimes abbreviated as PET
  • polyethylene naphthalate are particularly preferable.
  • polyester used in the present invention is preferably polyethylene terephthalate.
  • Polyethylene terephthalate film has excellent water resistance, durability and chemical resistance.
  • polyethylene terephthalate When polyethylene terephthalate is used as a basic component, from the viewpoint of film formation stability, it is preferably 1 mol% or more and 15 mol% or less, more preferably 3 mol% or more and 14 mol% or less, and most preferably, based on the total dicarboxylic acid component. It is preferable to use a copolyester containing 5 to 13 mol% of a copolysynthetic component. If it is less than 1 mol%, a layer containing inert particles, for example, containing 31% by weight or more of barium sulfate or titanium dioxide particles may not be able to form a film. Even more than 15 mol%, in some cases force s impossible film.
  • Examples of the copolymer component include dicarboxylic acid components such as isophthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, adipic acid, sebacic acid, phthalic acid, 5 — Sodium sulfoisophthalic acid.
  • Examples of the diol include ethylene glycol, 1,4 butanediol, 1,4-cyclohexanedimethanol, 1,6-hexanediol, neopentyl glycol, and polyalkylene glycol.
  • isophthalic acid or 2,6-naphthalenedicarboxylic acid as a copolymerization component of the polyester used for the polyester layer (A) in order to obtain good film forming properties.
  • the average reflectance in the wavelength range of 400 to 700 nm needs to be 97% or more on at least one side of the film. This is because if it is less than 97%, the brightness of the reverse prism type backlight may be lowered.
  • the average reflectance is the reflectance when an integrating sphere is attached to a Hitachi High-Technologies spectrophotometer (U-3310) and the standard white plate (aluminum oxide) is 100%. Measured from 400 to 700 nm, read the reflectance from the obtained chart at intervals of 5 nm, and averaged the values.
  • the reflectance is 98% or more, more preferably 100% or more.
  • the reflectivity is 98% or more, more preferably 100% or more.
  • the amount of added calories of the incompatible thermoplastic resin or inorganic particles used as the bubble-forming nucleating agent 110% or less is preferable since the property may become unstable.
  • Formation of fine bubbles is achieved by dispersing a high-melting-point polyester or an incompatible thermoplastic resin or inorganic particles in a film base material such as polyester, and stretching it (for example, biaxially). This is achieved by stretching. During stretching, voids (bubbles) are formed around the incompatible thermoplastic resin or inorganic particles, which exerts a scattering action on light, so that it becomes white and high reflectivity can be obtained. Incompatible thermoplastic resins and inorganic particles suitable in the present invention will be described later.
  • the center surface average roughness Ra of the film surface is 0.1 or more
  • the force and ten-point average roughness Rz is 1.0 or more. More preferably, Ra is 0.1 or more and less than 1.0 and Rz is 1.0 or more and less than 10.0, and more preferably Ra is 0.1 or more and less than 0.4 and Rz is 1.0 or more 6. Is less than 0.
  • the Ra and Rz values are related to the deterioration of the film surface due to friction between members. By providing minute irregularities on the surface of the member, rubbing can be reduced and stability can be improved.
  • Ra is less than 0.1 and Rz is less than 1.0, the difference in coefficient of thermal expansion between the components will be different when placed in an environment where the temperature and humidity conditions change greatly, assuming long-term use. Therefore, the force that causes the problem of distortion of the member is generated. This repetition promotes the deterioration of the member.
  • Ra is 0.4 or more, or R z is 6.0 or more, the scattering effect due to surface roughness becomes strong and the optical characteristics may be deteriorated.
  • the polyester film of the present invention preferably contains a large particle size particle.
  • the polyester film of the present invention has a polyester layer (A) and a polyester layer (B), the polyester layer (A) and / or the polyester layer (B)
  • the large particle diameter particles have the largest average particle diameter (average particle diameter refers to the number average particle diameter. The same applies in the present specification) among the particles contained in the film. Refers to large particles.
  • the type of particles used as the large particle size particles is not limited! /, but in order to obtain stable film-forming properties and high optical properties, the inorganic particles include silica particles, titanium dioxide particles, Acrylic particles and the like are preferable as the organic particles that are preferred to be barium sulfate particles, aluminum oxide particles, and the like. In addition, they can be used alone or in combination of two or more. Among them, silica particles are particularly preferred from the viewpoint of dispersion diameter stability of the particles and film formation stability.
  • the average particle size of the large particles is preferably 1 ⁇ 0 m or more, more preferably 1 ⁇ O ⁇ m or more and 5 111 or less, and further preferably 3 m or more and 5 m or less.
  • the content of the large particle size is preferably 0.01 wt% or more and 5.0 wt% or less, more preferably 0.01 wt% when the total weight of the polyester film is 100 wt%. % To 1.0% by weight, more preferably 0.01% to 0.5% by weight.
  • the polyester layer (A) and / or the polyester layer (B) contain large particle diameter particles, more preferably polyester.
  • the layer (B) contains a large particle size particle.
  • the average particle size of the large particles is preferably 1 am or more, more preferably 1 ⁇ m or more and 5, im or less, and even more preferably 3 ⁇ m or more and 5 111 or less. Further, the content is preferably 0.01-5M% by weight based on the total weight of the polyester layer (B), more preferably 0.01 ⁇ ; More preferably, the content is 0.01 to 0.5% by weight.
  • the average particle size of the large particle size is less than 1 ⁇ m, it is necessary to increase the content very much in order to increase Ra to 0.1 or more, resulting in light scattering by the particle. It has the power to cause deterioration of optical characteristics. Further, when the average particle size is 5 m or more, surface irregularities can be obtained, but light scattering by the large particle size particles becomes large, and optical characteristics may be deteriorated. Moreover, the film forming property may be deteriorated.
  • the content of the large particle size is 0.01% by weight or less, the surface roughness is small. And Rz value may decrease. For this reason, there is a force S that causes friction between members and promotes deterioration of the member. If the silica particles are 5% by weight or more, the optical properties may be deteriorated due to the scattering caused by the excessive silica particles.
  • the polyester film of the present invention is required to have fine bubbles inside the polyester film.
  • the polyester film contains a thermoplastic resin that is incompatible with polyester, thereby forming fine bubbles. be able to.
  • thermoplastic resin for example, poly 3 methyl phthalene is used.
  • poly-4-methylpentene 1, polybutyl t-butane, 1,4 trans poly 2,3 dimethyl butadiene, polybutyl cyclohexane, polystyrene, polymethyl styrene, polydimethyl styrene, polyfluoro styrene, poly 2 methyl-4 fluoro styrene
  • examples thereof include polymers having a melting point of 200 ° C. or higher selected from polyvinylino tert-butylenoate triole, cenololenoretriacetate, cenorenoretripropionate, polybulufluoride, polychlorofluoroethylene and the like.
  • polyolefin, particularly polymethylpentene is preferable for the polyester base material.
  • the addition amount of the incompatible thermoplastic resin is preferably 5% by weight or more and 25% by weight or less when the total weight of the entire polyester film is 100% by weight.
  • the polyester layer (A) and / or the polyester layer (B) contain an incompatible thermoplastic resin. Is to contain an incompatible thermoplastic resin in the polyester layer (A).
  • the content is preferably 5% by weight or more and 25% by weight or less based on the total weight of the polyester layer (A). 10% by weight or more and 25% by weight or less.
  • the incompatible thermoplastic resin is uniformly dispersed. Due to the uniform dispersion, bubbles are uniformly formed inside the film, and the degree of whitening and thus the reflectance becomes uniform.
  • a low specific gravity agent is added as a dispersion aid. It is effective to add.
  • a low specific gravity agent is a compound having an effect of reducing the specific gravity, and the effect is recognized in a specific compound.
  • polyalkylene glycols such as polyethylene glycol, methoxypolyethylene glycol, polytetramethylene glycol, polypropylene glycol, ethylenoxide / propylenoxide copolymer, sodium dodecylbenzenesulfonate, sodium alkylsulfonate , Glycerol monostearate, tetrabutylphosphonium paraamino benzenesulfonate and the like.
  • polyalkylene glycol, particularly polyethylene glycol is particularly preferred.
  • a copolymer of polybutylene terephthalate and polytetramethylene glycol is also preferably used for improving the dispersibility of the incompatible thermoplastic resin.
  • the amount added is preferably 3% by weight or more and 20% by weight or less, particularly preferably 10% by weight or more and 25% by weight or less, based on the total weight of the polyester film.
  • the amount of the low specific gravity agent added is relative to the total weight of the polyester layer (A). 3 to 25% by weight is preferable, and 10 to 20% by weight is particularly preferable. If the amount of the low specific gravity agent is too small, the effect of the addition is diminished, and if it is too large, the original properties of the film base material may be impaired.
  • a low specific gravity agent can be added in advance to the film base polymer and adjusted as a master polymer (master chip).
  • the apparent specific gravity of the polyester film becomes lower than that of a normal polyester film. If a lower specific gravity agent is further added, the specific gravity is further lowered. In other words, a white and light film can be obtained.
  • the specific gravity is preferably 0.5 or more and 1.2 or less.
  • the specific gravity In order to set the specific gravity to 0.5 or more and 1.2 or less, when a low specific gravity agent, for example, polymethylpentene having a specific gravity of 0.83 is used as described above, 5 to 25 with respect to the entire polyester film. Achievable force by adding less than or equal to weight% and setting the draw ratio to 2.5 to 4.5.
  • the polyester film of the present invention adopts embodiment 1, the apparent specific gravity is that of the present invention. If it is within the range, many fine bubbles can be present while maintaining the film strength, and a high reflectance can be obtained. That is, when it is used as a liquid crystal display reflector, the brightness of the screen is remarkably excellent.
  • the specific gravity of the white polyester film for a liquid crystal display reflector of the present invention is 0.5 or more and 1.2 or less, preferably 0.5 or more and 1.0 when an incompatible thermoplastic resin is used. In the following, a force of 0.55 or more and 0.8 or less is preferable in order to obtain higher reflectivity.
  • the average particle size of the incompatible thermoplastic resin contained in the polyester film is equal to or less than the average particle size of the large particle size (less than 1.0 m in case of large particle size). Force S is preferred. More preferably, it is not more than the average particle size of the large particle size and not less than 0.2 111 and not more than 5 111, and more preferably not more than the average particle size of the large particle size particle and not less than 0.3 111 and not more than 3 111.
  • Incompatible thermoplastic resin may correspond to large particle size, but in this case, the average particle size of the large particle size and the average particle size of the incompatible thermoplastic resin are the same. .
  • the average particle size of the incompatible thermoplastic resin is not particularly limited, but is preferably 0 • 2 ⁇ m or more and 1 ⁇ m. m, more preferably, 0.3 m or more and less than 1 ⁇ m.
  • one of the preferred embodiments is the ability to suitably use the incompatible thermoplastic resin described above to form fine bubbles, and the use of inorganic particles to form fine bubbles. is there.
  • titanium dioxide, barium sulfate, calcium sulfate, magnesium sulfate, aluminum oxide, zinc oxide, magnesium oxide are used as the particle types.
  • Calcium carbonate, barium carbonate, silica and the like are preferable.
  • they can be used alone or in combination of two or more, Of these, barium sulfate particles and titanium dioxide particles are particularly preferred because high optical properties and film-forming stability can be obtained.
  • the above-described large particle size particles can also be used as inorganic particles that form fine bubbles within a range that does not impair optical properties!
  • the barium sulfate particles are contained in an amount of 5 wt% to 70 wt% with respect to the total weight of the polyester film. More preferably, it is 10 wt% or more and 55 wt% or less, and further preferably 10 wt% or more and 50 wt% or less.
  • the polyester film of the present invention may contain 21 wt% or more and 70 wt% or less of barium sulfate particles based on the total weight of the polyester layer (A). preferable. More preferably, they are 23 weight% or more and 55 weight% or less, More preferably, they are 25 weight% or more and 50 weight% or less.
  • the polyester film of the present invention has a polyester layer (B), it contains 0.1 to 15% by weight of barium sulfate particles with respect to the total weight of the polyester layer (B). It is preferable. More preferably, it is 0.2 to 14% by weight, and further preferably 0.5 to 13% by weight.
  • the content is less than the lower limit of this range, the light scattered by the barium sulfate particles is insufficient, and sufficient reflection performance cannot be obtained. If the amount is larger than the upper limit of this range, the film-forming stability may be significantly lowered.
  • the average particle diameter of barium sulfate contained in the polyester film is equal to or less than the average particle diameter (less than 1 ⁇ O ⁇ m in the case where there is no large particle size), and from 0 ⁇ 111 to 10 111 Preferably it is below. More preferably, it is not more than the average particle size of the large particle size and not less than 0.3 111 and not more than 8 111, and more preferably not more than the average particle size of the large particle size particle and not less than 0.5 m and not more than 5 m.
  • the barium sulfate may be plate-shaped or spherical.
  • the force in which the barium sulfate particles may correspond to the large particle size particles, in this case, the large particle size
  • the large particle size The average particle size of the particles and the average particle size of the barium sulfate thermoplastic resin are the same.
  • the average particle size of barium sulfate is preferably 0.1 m or more and less than 1 m, more preferably 0.3 ⁇ m. Or more and less than 1 ⁇ m, and more preferably from 0. ⁇ ⁇ m to less than 1 ⁇ m.
  • the apparent specific gravity of the polyester film becomes lower than that of a normal polyester film.
  • an apparent specific gravity of 1.2 or higher is required to satisfy the optical characteristics while maintaining the mechanical characteristics of the substrate for the liquid crystal display reflector. More preferably, it is preferably 4 or less, but preferably 1.2 or more and 1.35 or less in order to obtain a higher reflectance.
  • the apparent specific gravity is within the range of the present invention, a large number of fine bubbles can be present while maintaining the film strength, and a high reflectivity can be obtained. In other words, when used as a liquid crystal display reflector, the brightness of the screen is remarkably excellent.
  • Various methods can be used as a method of blending inorganic particles such as barium sulfate particles and rutile-type titanium dioxide into the polyester composition.
  • the following method can be mentioned as the typical method.
  • A A method of adding particles before transesterification reaction or esterification reaction at the time of polyester synthesis, or a method of adding particles before the start of polycondensation reaction.
  • I A method in which particles are added to polyester and melt kneaded.
  • U In the method of (a) or (i) above, manufacture master pellets with a large amount of particles added, and knead them with polyester without additives to contain a predetermined amount of additives.
  • Method. E) A method of using the master pellet of (u) as it is.
  • the incompatible thermoplastic resin and barium sulfate particles have an average aperture of 10 to 100 m, preferably an average aperture of 15 to 15 made of a fine stainless steel wire having a wire diameter of 20 am or less as a filter during film formation. It is preferable to filter the molten polymer just before being extruded from the die using a 50 111 non-woven filter. By doing this, the number of coarse agglomerated particles can be reduced. Can do.
  • the white polyester film of the present invention is exposed to UV light derived from outside during storage, and is exposed to UV light from the fluorescent tube attached to the backlight unit during use, so the use of a light stabilizer is necessary. It is.
  • the polyester layer (B) preferably has a light stabilizer.
  • the polyester layer (A) may contain a light stabilizer as long as the characteristics are not impaired.
  • the content of the light stabilizer is preferably 0.02 wt% or more and 20 wt% or less, more preferably 0.1 wt% or more and 15 wt% or less, based on the total weight of the entire polyester film, Most preferably, it is 0.5 wt% or more and 15 wt% or less.
  • the polyester film of the present invention adopts embodiment 1, it is preferable that a predetermined amount of light stabilizer is contained in the polyester layer (B).
  • the content of the light stabilizer in the polyester layer (B) is preferably 0.5 to 20% by weight, more preferably 0.5 to the total weight of the polyester layer (B). Most preferably, it is 15% by weight, more preferably 1-5% by weight.
  • the content of the light stabilizer is less than 0.1% by weight, the light resistance is insufficient, and the film deteriorates during use for a long time, and its reflection characteristics are likely to be lowered. There's a problem. On the other hand, if it exceeds 20% by weight, the reflection characteristics may be deteriorated by coloring with a light stabilizer, which is not preferable.
  • the polyester film for a liquid crystal display reflector may be subjected to a heat step in a post-processing step such as coating, drying, and vapor deposition after film formation.
  • the light stabilizer used in the present invention is excellent in heat resistance because it is a film that directly receives heat from the fluorescent tube attached to the backlight unit after installation and can withstand long-term storage in a roll state. It is desirable to select those that have good compatibility with the above-mentioned polyester and can be uniformly dispersed, and that are less colored and do not adversely affect the reflection characteristics of the resin and film. It is not particularly limited as long as it is a light stabilizer that satisfies the above conditions.
  • Near the visible light range even when various kinds of dicarboxylic acid components with light stability such as UV stabilizers and naphthalenedicarboxylic acid are applicable.
  • malonic acid esters and naphthalenedicarboxylic acids which have excellent color tone because they do not have an absorption peak in the long wavelength region near 350 nm. More specific application examples are as follows.
  • Benzotriazole series 2— (2′-hydroxy 5 ′ methylphenol) benzotriazole, 2— (2′—hydroxy mono 5′—butyl phenol) benzotriazole, 2— (2′—hydroxy 3 ′, 5 ,-Tert-butylphenol) benzotriazole, 2- (2'-hydroxy 3'-t-butyl 5'-methylphenol) 1-5 clobenbenzotriazole, 2- (2'-hydroxy-3 ' , 5, 1-di-t-methylphenyl) 1-5-clobenzobenzolazole, 2- (2'-hydroxy-3-, 5-, 1-di-t-butylphenyl) 1-5-clobenzobenzolazole, 2- (2, -Hydroxy 5'-t octylpheninole) benzotriazole, 2- (2'-Hydroxy-3,5,1-di-tert-amylphenyl) benzotriazole, 2,2, methylenebis [4- (1, 1,
  • Cyanoacrylates Ethyl-2 Cyanol 3, 3, -Diphenyl atylates Triazines: 2— (2,4 Dihydroxyphenyl) 1,4,6 Bis (2,4 dimethylphenyl) 1,3,3 5 Triazine, 2, 4 Bis [2 Hydroxy 4-butoxyphenyl] — 6 — (2, 4 Dibutoxyphenyl) 1 1, 3, 5 Triazine
  • 2 Ethoxy 2'-Ethyloxazac acid bisanilide 2— (4, 6 diphenol 1 1, 3, 5 Triazine 1 2 yl) 5— [(Hexyl) oxy] —Phenol, 2- (4,6 bis (2,4 dimethylphenyl) -1,3,5 triazine-1,2) 5-hydroxyphenyl, 2-ethyl, 2,1 ethoxyxarulanilide.
  • Hindered amines bis (2, 2, 6, 6 tetramethyl-4-piperidyl) sepacate, dimethyl succinate 1-1 (2-hydroxyethyl) -4-hydroxy 2, 2, 6, 6 tetramethylbiperidine polycondensate
  • tetraethyl-2,2'-one (1,4 phenylene-dimethylidene) bismalonate, malonic acid [(4-methoxyphenol) -methylene]
  • malonic acid ((4-methoxyphenol) -methylene]
  • 2, 2,1,4,4 'tetrahydroxybenzophenone bis (2 methoxy-1,4 hydroxy-1,5 benzoylphenol) methane
  • 2,2'-methylene bis [4- (1, 1, 3, 3, 3 Tetramethylbutyl) -6— (2H Benzotriazole-2-phenol) phenol]
  • 2-— (4, 6 Diphenyl-1-phenol 1, 2, 5 Triazine-2-yl) 5— [(Hexyl ) Oxy] phenol, 2, 6 naphthalenedicarboxylic acid (hereinafter abbreviated as “NDC”) Application)
  • NDC naphthalenedicarboxylic acid
  • the light stabilizer may be a single polymer or a combination of two or more kinds, or a good polymer. Further, it may be a copolymer component for polyester or the like.
  • the content of the light stabilizer in the film is the amount of the light stabilizer component present in the polyester or the like (including the copolymer).
  • an inorganic light stabilizer may be added within a range in which the performance is not deteriorated.
  • Inorganic light stabilizers include titanium oxide and zinc oxide. Titanium dioxide is preferably used for improving the light and light stability.
  • the inorganic light stabilizer can also serve as the above-described large particle size particles or inorganic particles that form fine bubbles.
  • titanium dioxide When titanium dioxide is added, its average particle size is not particularly limited as long as it does not impair optical properties, but is preferably equal to or less than the average particle size of the large particle size (the large particle size is If not, it is less than 1.0 111), more preferably less than the average particle size of large particles and 0.1 m or more and 5 ⁇ 111 or less.
  • the content of titanium dioxide is preferably 1% by weight or more and 40% by weight or less, more preferably 5% by weight or more and 20% by weight or less, more preferably, based on the total weight of the polyester film. 5 to 15% by weight.
  • the content of titanium dioxide is more than 40% by weight, the film formation becomes unstable, and the optical properties may be deteriorated due to the light hiding property of the titanium dioxide particles.
  • the addition amount of titanium dioxide is less than 1 wt%, there is no deterioration of the optical performance, the effect of improving light stability is expressed Nikuiko and power s.
  • the polyester layer (B) contains a predetermined amount of titanium dioxide.
  • the polyester layer (A) may contain titanium dioxide.
  • the content of the stabilizer is preferably 5 to 20% by weight, more preferably 5 to 15% by weight, based on the total weight of the polyester layer (B).
  • the content of titanium dioxide is more than 20% by weight, the optical properties are reduced due to the light hiding property of the titanium dioxide particles.
  • the amount of titanium dioxide added is less than 5% by weight, the optical performance is not deteriorated, but the effect of improving the photostability may be hardly exhibited.
  • Light stabilizers have light in the ultraviolet region, particularly a peak with an absorption wavelength in the wavelength region of 340 nm to 350 nm, but in most of them, the light absorption region is in the visible light region (wavelength of 380 nm or more). Has reached. This appears yellowish when a light stabilizer is added to the white polyester film. This yellow tint causes a decrease in luminance when used as a white polyester film for a liquid crystal display reflector, and also affects the design of other optical members such as fluorescent tubes. For this reason, the light stabilizer may be required to keep the yellowness low.
  • Light stabilizers having an absorption wavelength not in the visible light region such as tetraethyl-2,2 '-(1,4 phenylene-dimethylidene) bismalonate, malonic acid [(4-methoxyphenyl) -methylene]- Yellowness can be kept low by using dimethyl ester, 2 ethyl, 2,1 ethoxyxarulanilide, and 2,6 naphthalenedicarboxylic acid.
  • malonic acid [(4-methoxyphenyl) -methylene] -dimethyl ester and 2,6 naphthalene diphenol are from the viewpoint of compatibility with polyester and no absorption wavelength in the visible light region. Acid is the most preferred!
  • the white polyester film of the present invention it is not preferable that dust adheres to the white polyester film of the present invention, particularly in processing and assembly processes. Therefore, it is preferable to provide a layer (C) containing an antistatic agent on at least one side of the white polyester film.
  • the layer (C) containing an antistatic agent is formed by stretching an aqueous coating solution in at least one direction after coating and drying from the viewpoint of environmental pollution prevention and explosion-proof properties during film production. It is preferably formed in a production process in which a base film composed of a polyester layer (A) and a polyester layer (B), which is preferably a coating layer, is biaxially oriented.
  • the stretching timing is not particularly limited, but stretching in at least a uniaxial direction after applying the coating liquid. Is preferred.
  • a method of biaxially stretching after applying an aqueous coating liquid, or a method of applying an aqueous coating liquid after longitudinal (film longitudinal direction) stretching and further laterally stretching is preferably used.
  • Examples of the application method of the aqueous coating liquid include various application methods such as a reverse coating method, a gravure coating method, a rod coating method, a bar coating method using a metering bar, a die coating method, and a spray coating method.
  • the force that can be preferably used is not limited to these.
  • the aqueous coating liquid may contain a slight amount of an organic solvent for the purpose of assisting the stability of the coating liquid.
  • organic solvent include methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, di-xane, cyclohexanone, n-hexane, tolylene, xylene, methanol, ethanol, n-propanol, and isopropanol. Can do. Multiple organic solvents may be contained.
  • the aqueous coating liquid contains other surfactants, ultraviolet absorbers, pigments, lubricants, anti-blocking agents, water-soluble substances within a range that does not impair the object of the present invention.
  • crosslinkers such as water-soluble polymer resins, oxazolines, melamines, epoxies, and aziridines and other antistatic additives.
  • the solid content concentration in the aqueous coating liquid in the present invention is preferably 5 to 30% by weight, more preferably 5 to 20%.
  • the thickness of the layer (C) containing the antistatic agent is preferably from 0 ⁇ 01 to 2111, more preferably from 0.1 to 1111. If the thickness is too thin, the solvent resistance and antistatic property may be insufficient, and if the thickness is too thick, the slipperiness may be inferior.
  • the surface resistivity of the layer containing the antistatic agent (C), 23 ° C, the surface resistivity at a relative humidity of 50% is 1 X 10 13 ⁇ / mouth or less, preferably 10 It is preferably 7 ⁇ / port or more and 10 13 ⁇ / port or less. If the surface specific resistance value is less than 10 7 ⁇ / mouth, the surface adhesion and film forming property may be inferior. If the surface specific resistance value is greater than 10 13 ⁇ / mouth, the antistatic property will be insufficient. As a result, the antifouling property may be insufficient. In the present invention, the surface specific resistance value is measured, for example, by the following method.
  • the electrode type is a company-made product (model No. P-618), which is a concentric electrode with a main electrode outer diameter of 90 mm and a counter electrode inner diameter of 45 mm.
  • the antistatic agent (P) added to the layer (C) containing the antistatic agent in order to develop the above-mentioned antistatic properties includes metal powder, tin oxide-antimony based conductive agent,
  • the antistatic agent used is resistant to heat and has little coloration due to the same requirements as those required when selecting the light stabilizer described above. Selection of V, which does not adversely affect the reflection characteristics of resin and film is desirable.
  • the antistatic agent satisfying the above conditions is not particularly limited.
  • the molecular polymer (P-2) are preferably.
  • the antistatic agent is added in an amount of 10 to 60 parts by mass, preferably 15 to 5% of the antistatic agent (P-1) made of polycation polymer, based on the total weight of the layer (C) containing the antistatic agent. 50 parts by mass.
  • this ratio is less than 10 parts by mass, the antistatic property is low, and when it is 60 parts by mass or more, the layer (C) having the antistatic agent becomes unstable, causing aggregation, cracks, etc., and the film becomes cloudy or charged.
  • the prevention property is lowered and the heat resistance is also likely to be lowered.
  • the addition amount is preferably 5 to 40 parts by mass with respect to the total weight of the layer (C) containing the antistatic agent, more preferably 5 ⁇ 30 parts by mass.
  • the amount is 5 parts by mass or less, the antistatic property is lowered.
  • the amount is 40 parts by mass or more, the layer (C) having an antistatic agent becomes unstable, causing aggregation, cracks, and the like, and the film is white. Turbidity 'antistatic property is lowered, and heat resistance is likely to be lowered.
  • details of the polycation polymer (P-1) and the conductive polymer polymer (P-2) are described below.
  • the polycation polymer (P-1) that can be selected as an antistatic agent in the present invention is heat resistant, has little coloration, and does not adversely affect the reflection characteristics of the resin and film!
  • copolyesters comprising a compound comprising or a compound containing a carboxylate group!
  • the cation component of the sulfonate group includes, for example, a force S including sulfoterephthalic acid, 5 sulfoisophthalic acid, 4 sulfoisophthalic acid, 4 sulfonaphthalene-1,2 dicarboxylic acid, and the like. It is not a thing.
  • Examples of the cation component of the carboxylate group include trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, 4-methinolecyclohexene 1, 2, 3 3, 4, tert-tetracarboxylic acid, 5- (2,5 dioxotetrahydrofurfuryl) -3 cyclohexene-1, 2 dicarboxylic acid, cyclopentanetetracarboxylic acid, 2, 3, 6, 7 naphthalene Tetracarboxylic acid, 1, 2, 5, 6 naphthalenetetracarboxylic acid, ethylene glycol bistrimethylate, 2, 2 ', 3, 3'-diphenyltetracarboxylic acid, thiophene 2, 3, 4, 5
  • the power of ethylene tetracarboxylic acid and the like is not limited to these.
  • sulfonic acids and carboxylic acids sulfoterephthalic acid, 5-sulfoisophthalic acid, and 4-sulfoisophthalic acid, which have excellent heat resistance and adhesion to the polyester layer (A) or (B) described later, are used. Most preferred!
  • Examples of the anion component of the sulfonate group and carboxylate group include ammonium ion, strong ion, sodium ion, lithium ion, and the like. From the viewpoint of antistatic property and film forming property, ammonium ion, It is preferable to use lithium ions.
  • polycation polymer a polymer having a structure represented by the following formula (I) as a main repeating unit can also be suitably used.
  • R and R are each H or CH, R 3 is an alkylene having 2 to 10 carbon atoms;
  • R 4 and R 5 are each a saturated hydrocarbon group having 1 to 5 carbon atoms
  • R 6 is an alkylene group having 2 to 10 carbon atoms
  • p is! ⁇ 20 number
  • q is;! ⁇ 40 number
  • Y- is halogen ion, mono or poly It is a halogenated alkyl ion, nitrate ion, sulfate ion, alkyl sulfate ion, sulfonate ion or alkyl sulfonate ion.
  • R 7 is a saturated hydrocarbon group having 1 to 5 carbon atoms
  • R 3 in — (OR 3 ) —
  • the polycation polymer (P-1) can be preferably produced, for example, by the following method. That is, an acrylic acid ester monomer is converted into an ester ester having a weight average molecular weight of 2000 to 100000 by emulsion polymerization, and then N, N dianolenoaminoaminoalkylamine (for example, N, N dimethylaminopropylamine). , N, N jetylaminopropylamine, etc.) and amidation, and finally quaternary hydroxyalkylation reaction is performed to introduce a quaternary cation pair.
  • N N dianolenoaminoaminoalkylamine
  • the polycationic polymer (P-1) is represented by Y—CH 2 CH 2 SO—, C 3 H 2 SO—, or
  • polymers represented by the following formulas (II) and (III) can also be suitably used.
  • X R 1 and R 2 above are each an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group, an aryl group, or an achiral group. Among these, an alkyl group having 1 to 6 carbon atoms is preferable.
  • R 13 R 16 is an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group, an aryl group, an arachiral group, etc.
  • R 17 R 18 is an alkylene group and a cycloalkylene group having 2 to 10 carbon atoms each; , Arylene group, allylalkylene group, and divalent aliphatic group containing a heteroatom (0 N, etc.).
  • This aliphatic group includes CH (OH) CH- CH CH (OH) CH- C
  • One example is H CH CH NHCOCH CH CH.
  • the above repeating units are preferably composed of 50 mol% or more. If it is less than 50 mol%, the antistatic property is insufficient.
  • Other unsaturated monomers include methyl acrylate, ethyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-hydroxyethyl methacrylate, croton Methyl acid, glycidyl metatalylate, acrylic metatalylate, attalinoleamide, methacrylolamide, N methylolacrylamide, ethylene, styrene, butyl acetate, acrylic nitrile, methacryl nitrile, butyl chloride, vinylidene chloride, dibutene benzene , Acrylic acid, methacrylic acid, maleic acid, fumaric acid.
  • an antistatic polymer pyrrole and / or obtained by polymerizing thiophene and / or thiophene derivatives.
  • antistatic polymers obtained by polymerizing pyrrole derivatives.
  • the antistatic polymer obtained by polymerizing thiophene and / or thiophene derivative is a homopolymer or copolymer having a unit represented by the following formula (1) and / or formula (II) as a main component It may be a copolymer and a copolymer containing a small amount of other polymerized units as a copolymerization component.
  • R 2 is each a hydrogen element (one H), an aliphatic hydrocarbon group having 1 to 20 carbon atoms, an alicyclic hydrocarbon group or an aromatic hydrocarbon group, a hydroxyl group (one OH), and a group having a hydroxyl group at the terminal (— R 3 OH:
  • R 3 is a divalent hydrocarbon group having 1 to 20 carbon atoms (for example, an alkylene group, arylene group, cycloalkylene group, alkylene'arylene group, etc.), an alkoxy group (one OR 4 : R 4 Is a hydrocarbon group having 1 to 20 carbon atoms), a group having an alkoxy group at the terminal (—R 3 OR 5 :
  • R 5 is an alkyl group having 1 to 4 carbon atoms), a carboxyl group (—COOH), a carboxyl base ( — COOM: M is an alkali metal element, quaternary amine or tetraphosphonium), a group having a
  • a group having a mino group (one R 3 NH), a part of or all of the hydrogen elements of the amino group being substituted
  • R 7 is a hydrogen element, an alkyl group having 1 to 3 carbon atoms, —CH 0 H or —CH
  • ⁇ R 6 R 8 is an alkyl group having 13 carbon atoms, CH ⁇ H or — CH ⁇ R 6 ), water of an amino group
  • a group having one or all of the elementary elements substituted at the end (one R 3 NR 7 R 8 ), a force rumomoyl group (—CONH), a group having a force rubamoyl group at the end (—R 3 CONH or R 3
  • ONR 7 R 8 a group having one or all of the hydrogen elements of the rubamoyl group substituted at the end (one R 3 CONR 7 R 8 ), a halogen group (one F Cl Br I), R 4 A group in which a part of the hydrogen element is substituted with a halogen element, a group represented by — [NR R ⁇ ] [X (where R 9 is a hydrogen element or a hydrocarbon group having! -20 carbon atoms, X— is F—Cl Br_ ⁇ R'OSO
  • the antistatic polymer obtained by polymerizing thiophene and / or thiophene derivative is added with a doping agent in order to improve the antistatic property, for example, with respect to 100 parts by weight of the antistatic polymer. ; 500 parts by weight can be blended.
  • a doping agent LiCl I ⁇ COOL R " 3 : Carbon number;! ⁇ 30 saturated hydrocarbon group), R 1Q SO Li
  • Examples thereof include sulfonic acid, polystyrene sulfonate Na (K Li) salt, styrene 'styrene sulfonate Na (K Li) salt copolymer, styrene sulfonate anion, styrene sulfonate' styrene sulfonate anion copolymer.
  • a homopolymer or copolymer having as a main component a unit represented by the above formula (II) and a combination of polystyrene sulfonic acid as a doping agent (the following formula (IV)) is preferable.
  • the antistatic polymer obtained by polymerizing pyrrole and / or a pyrrole derivative is, for example, a homopolymer or a copolymer having as a main component a unit represented by the following structural formula.
  • a copolymer containing a small amount of a unit as a copolymerization component may be used.
  • R 1 is hydrogen or an alkyl group
  • R 2 to R 3 are hydrogen, an alkyl group, a carboxylic acid (salt) group or a sulfonic acid (salt) group-containing group, a halogen-containing group, an ester group, respectively. Or it is an ether group.
  • the antistatic polymer can be produced by polymerizing these pyrroles and pyrrole derivatives by a known method (for example, an acid polymerization method, an electrolytic polymerization method, etc.).
  • a known method for example, an acid polymerization method, an electrolytic polymerization method, etc.
  • pyrrole and pyrrole derivative pyrrole in which ⁇ is hydrogen, In R 3 are hydrogen, can be R 2 is a pyrrole derivative is Al kill group, in which R 1 is hydrogen, R 2 and R 3 are preferably exemplified pyrrole derivative is an alkyl group.
  • Examples of this pyrrole derivative include N-substituted pyrrole such as pyrrolinole and N-alkylpyrrole, and 3-alkylpyrrole having a C1-C6 alkynole group, alkoxy group or halogen group at the 3rd, 3rd, or 4th position.
  • N-substituted pyrrole such as pyrrolinole and N-alkylpyrrole
  • 3-alkylpyrrole having a C1-C6 alkynole group, alkoxy group or halogen group at the 3rd, 3rd, or 4th position 3,4-Dianolecylpyronole, 3-Dianoloxypyrrolone, 3,4-Dianoloxypyrrolone, 3-Chloropyrrole, 3,4-Dichloropyrrole are preferred.
  • the film forming property is dramatically improved by selecting a component having interfacial adhesion with the polyester layer (A) or (B).
  • a component having interfacial adhesion with the polyester layer (A) or (B) it will not specifically limit if it is a component satisfying this condition, polyester resin, acrylic resin, urethane resin, epoxy resin, silicone resin, urea resin, phenol resin, etc.
  • polyester resin acrylic resin, urethane resin, epoxy resin, silicone resin, urea resin, phenol resin, etc.
  • the acid component constituting this copolyester resin includes terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid, phenylindane.
  • Examples thereof include dicarboxylic acid and dimer acid. Two or more of these components can be used.
  • unsaturated polybasic acids such as maleic acid, fumaric acid, and itaconic acid
  • hydroxycarboxylic acids such as p-hydroxybenzoic acid and p- ( ⁇ -hydroxyethoxy) benzoic acid may be used together with these components. it can.
  • Unsaturated polybasic acid component proportion of Ya hydroxycarboxylic acid component is at most 10 mol 0/0, preferably 5 mole 0/0 or less.
  • the polyol components include ethylene glycolol, 1,4 butanediole, neopentinoleglycolanol, diethyleneglycolinole, dipropyleneglycolinole, 1,6-hexanediol mononole, 1,4-cyclohexanedimethanol, and xylylene. Examples include glycol, dimethylolpropionic acid, glycerin, trimethylolpropane, poly (ethyleneoxy) glycol, poly (tetramethyleneoxy) glycol and the like.
  • the adhesion at the interface can be optimized, and the solvent resistance can be imparted. Since the recoverability is also excellent, it can be suitably used.
  • Isophthalic acid content of the heavy composite spectral preferably the gesture et preferred is 65 to 95 mole 0/0 Ru 70-95 mole 0/0 der.
  • the amount of diethylene glycol as the polymerization component is preferably from 50 to 95 mol%, more preferably from 60 to 90 mol%.
  • known dicarboxylic acids and diols can be used, but are not limited thereto.
  • the range of the glass transition point of the polymerized polyester is preferably 0 to 60 ° C, more preferably 10 to 45 ° C.
  • the constituent components of the copolymerized acrylic resin include acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, sodium acrylate, ammonium acrylate, 2-hydroxyxethyl acrylate, methacrylic acid, methacrylic acid.
  • These monomers can be used in combination with other unsaturated monomers such as styrene, butyl acetate, acrylonitrile, methacryl nitrile, butyl chloride, vinylidene chloride and dibutylbenzene.
  • unsaturated monomers such as styrene, butyl acetate, acrylonitrile, methacryl nitrile, butyl chloride, vinylidene chloride and dibutylbenzene.
  • a modified acrylic copolymer for example, a block polymer obtained by modifying the acrylic copolymer with polyester, polyurethane, silicone, epoxy, phenol resin, or the like, or a graft polymer is used. You can also.
  • the content of the vehicle material is preferably 60 to 95 parts by mass with respect to the total amount of the resin forming the layer (C) having the antistatic agent. If the content is too small, the solvent resistance and the interfacial adhesion to the polyester layer (A) or the polyester layer (B) may be inferior. If the content is too large, the antistatic property may be inferior.
  • the surfactant (R) is used to make the adhesion between the coating film and the polyester film strong and to improve the blocking resistance of the antistatic laminated film. Is preferably blended.
  • the surfactant (R) include alkylene oxide homopolymers, alkylene oxide copolymers, aliphatic alcohols / alkylene oxide adducts, long chain aliphatic substituted phenol / alkylene oxide addition polymers, polyvalent Nonionic surfactants such as alcohol aliphatic esters and long-chain aliphatic amide alcohols, cationic compounds such as compounds having quaternary ammonium salts, compounds having alkyl pyridinium salts, compounds having sulfonates, etc.
  • Anionic surfactants can be mentioned, and nonionic surfactants are particularly preferable because they have excellent effects on the adhesion between the coating film and the polyester film and the blocking resistance of the antistatic polyester film.
  • the content of the surfactant is from! To 15 parts by mass, preferably from 3 to 10 parts by mass, based on the total amount of the resin forming the layer (C) having the antistatic agent. If this ratio is less than 1 part by mass, the wettability of the aqueous coating liquid to the polyester film may be insufficient, and if it exceeds 15 parts by mass, the adhesion of the coating film to the polyester film may be insufficient, or the blocking resistance may be reduced. It may be insufficient. [0120] [Film Formation Method]
  • the present invention is not limited to the power and examples described for the production method of the white polyester film.
  • Polymethylpentene as an incompatible thermoplastic resin, polyethylene glycol, polybutylene terephthalate and polytetramethylene glycol copolymer as low specific gravity agents are mixed with polyethylene terephthalate, and mixed thoroughly and dried to 270 ⁇ Feed to Extruder A heated to 300 ° C.
  • the stretching ratio is preferably a force S for stretching 2.5 to 4.5 times in the longitudinal and lateral directions, and the area ratio (longitudinal stretching ratio X lateral stretching ratio) is 9 to 16 times. If the area magnification is less than 9 times, the whiteness of the film obtained becomes poor. Conversely, if the area magnification exceeds 16 times, the film tends to be broken during stretching and the film forming property tends to be poor.
  • heat setting at 150 to 230 ° C in a tenter, uniform cooling, and cooling to room temperature are taken up. Obtain white polyester film / rem for LCD reflectors.
  • the white polyester film for a reflector of a liquid crystal display according to the present invention obtained by force, has a high reflectivity because at least one surface has a high gloss, less diffuse reflection, and fine bubbles are formed inside the film. Therefore, high luminance can be obtained when it is used as a reflector for a reverse prism type liquid crystal display. It also has excellent durability against ultraviolet light.
  • the configuration of the white polyester film for a liquid crystal display reflector of the present invention is a laminated structure using the polyester layers (A) and (B) as described above, and the layer (A) is a front layer. The layer containing fine bubbles is preferable for achieving both high reflectivity and film forming properties.
  • the polyester whose film surface is preferably a polyester layer (B), and to the total weight of the polyester layer (B) (layer containing inorganic particles and / or organic particles).
  • a layer containing 0.5% by weight or less, preferably 0.1% by weight or less, more preferably 0.07% by weight or less is convenient for improving the specular reflectivity.
  • the reverse prism method has a structure in which the reflector 12 in FIG. 1 is in close contact with the light guide plate 13 due to its configuration, and it is easy to cause a problem that inorganic particles fall off and scratch the light guide plate. ing. If the amount of added particles exceeds 0.5% by weight, scratches are likely to occur due to particle dropping. Therefore, the amount of added particles should be 0.5% by weight or less. S is preferable, and more preferably 0.1% by weight. % Or less.
  • the physical property value evaluation method and the effect evaluation method of the present invention are as follows.
  • the film thickness was measured at 10 points with a calibrated digital micrometer (M-30, manufactured by Sony Precision Technology), and the average value was taken as the film thickness.
  • the film was sampled to 5 mm X lcm and pressed in the cross-section direction on ice using a microtome. Using a transmission electron microscope HU-12 (manufactured by Hitachi, Ltd.), the cross section of the cut polyester layer (A) and polyester layer (B) of the cut sample was observed and magnified 250 times. From this, the laminate thickness was converted and determined.
  • the particle size was measured, 5 particles were removed from the largest and 5 particles from the smallest, and the average particle size was determined from the remaining 90 particles (if the particles were not spherical) Approximate the ellipse closest to the shape, and (obtained by (major axis + minor axis) / 2 of the ellipse).
  • ⁇ : Stable film can be formed for more than 1 hour.
  • the film after film formation was cut into a size of 0.5 m ⁇ 0.5 m, and the coated surface was visually observed to count the number of oval defects peculiar to missing coating.
  • ⁇ -17A surface resistivity meter manufactured by Kawaguchi Electric Mfg.
  • ⁇ -17A surface resistivity meter
  • the electrode type used here is a company-made (model number P-618), which is a concentric electrode with an outer diameter of 90 mm for the main electrode and an inner diameter of 45 mm for the counter electrode.
  • a white polyester film cut to A4 size was conditioned for 24 hours in a measurement atmosphere of 23 ° C and 50% RH.
  • the conditioned film surface was rubbed 10 times with a friction cloth (wool 100%).
  • the film was immediately pre-dried at 70 ° C. for 1 hour, and 1.5 g of tobacco ash was gradually brought close to and brought into contact with a desk spread over a range of 10 cm ⁇ 10 cm. Tobacco ash adhesion was determined visually. ⁇ or more is acceptable.
  • Light resistance was evaluated by irradiating the sample with ultraviolet rays using an I-Super UV tester (model number: SUV-W131) manufactured by Iwasaki Electric and measuring the color tone b value before and after the irradiation.
  • the irradiation UV amount was 100 mW / cm 2 at a wavelength of 365 nm, and the UV irradiation time was 4 hours.
  • the reflection film 12 of the four-light type backlight of the liquid crystal monitor (750B) manufactured by Samsung Corp. was changed to the reflection film produced in each example and comparative example, and measurement was performed.
  • luminance measurement use a 100V household power supply and switch the ON / OFF switch to apply the voltage. I waited for the brightness of the cold-cathode tubes to become uniform. Thereafter, the luminance was measured with a luminance meter 15 (BM-7fast manufactured by topcon) at a measurement distance of 500 mm. The average number of measurements shall be 3 times.
  • a relative evaluation with Toray reflective film E6SL total thickness of each film layer 250 ⁇ m as 100 was used.
  • the raw materials shown below were mixed with the raw materials shown in Table 1 for the raw material polymer of the polyester layer (A).
  • the extrusion temperature was set to 320 ° C, and it was prepared by supplying to Extruder A heated to 270 to 300 ° C.
  • light stabilizers a to d listed below on polyethylene terephthalate chips One type, silica particles with an average particle diameter of 3 ⁇ 2 m, and titanium dioxide with an average particle diameter of 0 ⁇ 2 m, mixed in the proportions shown in Table 2, were vacuum-dried at 180 ° C for 3 hours, then 280 The raw material polymer of the polyester layer (B) was produced by supplying to the extruder B heated to ° C.
  • a Malonic acid ester light stabilizer ("B-CAP” manufactured by Clariant Japan Co., Ltd.)
  • b Malonic acid ester light stabilizer ("PR-25” manufactured by Clariant 'Japan Co., Ltd.)
  • c Triazine-based light stabilizer (Ciba 'Specialty Chemicals'"CGX006")
  • d Benzophenone-based light stabilizer (Asahi Denka Co., Ltd. "ADK STAB LA-51").
  • the composition of the coating solution for forming the layer (C) containing the antistatic agent is as follows. Nippon Carbide Co., Ltd. coating Nikiroku sol RX- 7013ED (acrylic polyester resin emulsion: indicated as X in Table 3) and Japan NSC coating Versa YE- 910 (Polyester lithium sulfonate lithium salt antistatic agent : Indicated by Y in Table 3) In a solid mass ratio, RX-7013ED and YE-910 mixed in the proportions shown in Table 3 were diluted with water, and the surfactant RY-2 manufactured by Interactive Chemical Co., Ltd. It was prepared by adding 0.1% of the liquid ratio. The coating layer (C) was provided on one surface of the film, and this surface was designated as A surface.
  • the raw material polymers of the polyester layers (A) and (B) were laminated through a laminating apparatus so that the layer constitution and the layer thickness were as shown in Table 1, and formed into a sheet by a T-die. Furthermore, this film was cooled and solidified with a cooling drum with a surface temperature of 25 ° C, and the unstretched film was guided to seven rolls whose heating temperature was adjusted to 85 to 98 ° C, and stretched 3.4 times in the longitudinal direction. And cooled in a 25 ° C mouth group. Subsequently, a coating solution for forming a layer (C) containing an antistatic agent was applied by a bar coating method using a metallizing bar to form a C layer.
  • the coated film thus obtained was stretched by 3.6 times in the direction perpendicular to the longitudinal direction in an atmosphere heated to 130 ° C. while being held by both ends with a lip and guided to a tenter. Thereafter, heat setting was performed at 190 ° C. in a tenter, and after uniform cooling, the film was cooled to room temperature to obtain a film having a winding thickness of 250 m.
  • Table 9 shows the physical properties of the obtained film as a reflector substrate. In either case, the antistatic property was good on at least one film surface.
  • the raw materials for the polyester layer (A) and polyester layer (B) shown in Tables 4 and 5 were supplied to two extruders heated to 280 ° C, respectively. Then, they were merged using a multi-layer feed block device, and formed into a sheet from a die while maintaining the laminated state. Further, the unstretched film obtained by cooling and solidifying this sheet with a cooling drum with a surface temperature of 25 ° C is heated at 90 ° C, stretched 2.9 times in the longitudinal direction (longitudinal direction), and cooled with a roll group at 25 ° C. did. The following aqueous coating liquid was applied to one surface or both surfaces of this uniaxially stretched film at a coating amount of 4 g / m 2 (wet) by the microgravure coating method.
  • the copolymerized polyester used is a copolymer of dicarboxylic acid component or diol component in the amount of copolymerization (mol%) described in the table.
  • the finished polyester is shown.
  • IPA is isophthalic acid (dicarboxylic acid component)
  • CHDM is cyclohexanedimethanol (diol component).
  • the acid component is terephthalic acid [67 mol 0/0], isophthalic acid [27 mol 0/0] and 5-Na sulfoisophthalic acid [6 mol%
  • Polystyrene sulfonate Na (Chemistat SA-9, manufactured by Sanyo Kasei) (shown as p-1 in Table 6) or polythiophene water dispersion (Vitron P, manufactured by Bayer) (shown as p-2 in Table 6) )
  • As the antistatic agent (P) polyoxyethylene lauryl ether (indicated as r in Table 6) as the surfactant (R), and 10 wt. % Aqueous solution was used.
  • the coating layer (C) is provided on one surface of the film, the surface is the A surface.
  • the coating layer (C) was provided on the surface of the polyester layer (A), and the surface was defined as the A surface.
  • coating layers (C) were provided on both surfaces of the film, they were designated as A and B surfaces, respectively.
  • Table 8 shows the types and contents of light stabilizers. Silica, barium sulfate, titanium dioxide, and polymethylpentene contained in the film all formed V and fine bubbles in the film.
  • films were formed in the same manner and conditions as in Example 20. Since the content of inorganic particles is small and the total thickness is thin, the number of bubbles is reduced, resulting in low reflectivity.
  • films were formed in the same manner and conditions as in Example 20.
  • the content of inorganic particles is sufficient, but the total thickness is thin, so the number of bubbles is reduced, resulting in low reflectivity.
  • PET Polyethylene terephthalate
  • PEN Polyethylene naphthalate
  • PET Polyethylene terephthalate
  • PEN Reethylene naphthalate
  • NDC Naphthalene carbonate
  • ⁇ Isophthalic acid
  • CHDM Cyclohexane Methanol
  • PET Polyethylene terephthalate
  • PEN E-J ethylene naphthalate
  • NDC Naphthalene carbonate
  • IPA Isophthalate
  • CHDM Cyclohexane di-methanol
  • the coating layer (C) was provided on the surface of the layer (A), and the surface was defined as the A plane.
  • the coating layer (C) was provided on both surfaces of the film, they were designated as A side and B side, respectively.
  • Example 23 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 24 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 25 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 26 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 27 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 28 B / A / B 150 Silica 0.01 1 3.2 Sulfuric acid Barium 31.9 1.2
  • Example 29 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 9 Sulfuric acid
  • Example 31 B / A / B 150 Silica 0.046 3.2 Barium sulfate 31.9 9 1.2
  • Example 32 B / A / B 150 Silica 0.01 1 5.0 Barium sulfate 31.9 9 1.2
  • Example 33 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 34 B / A / B 170 Silica 0.01 1 3.2 Barium sulfate 33.7 1.5
  • Example 35 B / A / B 1 70 Sulfuric acid 33.7 1.5---Barium
  • Example 36 A / B 150 Silica 0.036 3.2 Titanium dioxide 23.7 1.5
  • Example 37 A / B 1 50 Dioxide 23.7 1.5---Titanium
  • Example 38 A / B 1 50 Silica 0.036 3.2 Barium sulfate 33.8 1.2
  • Example 39 A / B 1 50 Silica 0.036 3.2 Barium sulfate 33.8 1.2
  • Example 4C A / B 150 Silica 0.036 3.2 Barium sulfate 33.8 1.2
  • Example 41 A / B 150 Silica 0.036 3.2 Barium sulfate 33.8 1.2
  • Example 42 A / B 150 Silica 0.036 3.2 Barium sulfate 33.8 1.2
  • Example 43 A / B 150 Silica 0.036 3.2 Barium sulfate 33.8 1.2 Sulfuric acid
  • Example 44 A / B 150 33.8 1.2 One--Barium
  • Example 45 A / B 150 Silica 0.014 3.2 Barium sulfate 33.8 1.2
  • Example 46 A / B 150 Silica 0.36 3.2 Barium sulfate 33.8 1.2
  • Example 47 A / B 150 Silica 3.6 3.2 Barium sulfate 33.8 1.2
  • Example 48 A / B 150 Silica 0.036 5.0 Barium sulfate 33.8 1.2
  • Example 49 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.2
  • Example 51 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31.9 1.0 Sulfuric acid
  • Example 53 A only 120 Silica 0.05 3.2 Barium sulfate 45 1.2 Comparative example 6 B / A / B 150------Dioxide
  • Comparative Example 9 B / A / B 20 Silica 0.01 7 3.2 Barium sulfate 7.6 1.3 Comparative Example 10 B / A / B 20 Silica 0.01 7 3.2 Titanium dioxide 23.7 1.5 Comparative Example 1 1 B / A / B 150 Silica 0.01 1 3.2 Barium sulfate 31 .9 1.3 Comparative Example 12 B / A / B 270 Silica 0.036 3.2 Calcium carbonate 30.1 1.2 Comparative Example 13A only 150---Barium sulfate 50 1.5 Where the layer (C) is provided on one side of the film, The f3 ⁇ 4 plane was designated as the A plane.
  • the coating layer (C) was provided on the surface of the layer (A), and the surface was designated as the A surface.
  • the coating layer (C) was provided on both surfaces of the film, they were designated as A side and B side, respectively.
  • NDC Naphthalene Carpon
  • Light Stabilizer a Malonic acid ester light stabilizer ("B-CAP") b: Malonic acid ester light stabilizer ("PR-25”) c: Triazine light stabilizer (“CGX006) d: Benzophenone Light stabilizer ("LA-51”)
  • Example 24 1-Light stabilizer a 3.0 Light stability a 0.6
  • Example 25-One Light Stabilizer a 5.0 Light Stabilization ⁇ a 1.0
  • Example 26 --Light Stabilizer b 3.0 Light Stabilization ⁇ b 0.6
  • Example 29--NDC 8.9 NDC 1.8 One-NDC 8.9 NDC 1.8
  • Example 31 One-NDC 8.9 NDC 1.8
  • Example 32 One-NDC 8.9 NDC 1.8
  • Example 33 One-NDC 8.9 NDC 1.8
  • Example 34--NDC 8.9 NDC 2.1 Example 35--NDC 8.9 NDC
  • Example 40 Light Stabilizer c 3 NDC 4.5 Light Stabilizer c, 3.4
  • Example 42 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 43 NDC 17.7 NDC 4.5 NDC 14.4
  • Example 44 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 45 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 46 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 47 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 48 NDC 8.9 NDC 4.5 NDC 7.8
  • Example 52 1-NDC 8.9 NDC 1.5
  • Example 53 Light stabilizer a 3--Light stabilizer a 3.0
  • Comparative example 10 38.6 18.8 32.7 Titanium dioxide Titanium dioxide Titanium dioxide Comparative example 1 1--NDC 8.9 NDC 1.8 Comparative example 12--Light stabilizer a 3.0 Light stabilizer a 1.2 Comparative example 13--- ---
  • LA-51 Benzophenone light stabilizer
  • the present invention is suitably used as a substrate for a reflective film that requires light resistance and dust removal performance.
  • FIG. 1 is a conceptual diagram of a luminance measurement system.

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Abstract

Le problème à résoudre dans le cadre de cette invention consiste à améliorer la durabilité d'un film réfléchissant et d'un élément périphérique, et à réduire les rebuts de fabrication en empêchant l'adhérence de fines matières étrangères, poussière par exemple. La solution proposée consiste en film de polyester blanc pour réflecteurs d'écrans à cristaux liquides ; ledit film contient un agent photostabilisant dans un film de polyester comportant de fines bulles d'air, et il fait preuve d'une réflectivité moyenne d'au moins 97 % sur la surface d'au moins un côté du film.
PCT/JP2007/070583 2006-10-27 2007-10-23 Film de polyester blanc pour réflecteur d'écran à cristaux liquides WO2008053740A1 (fr)

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CN2007800323665A CN101512394B (zh) 2006-10-27 2007-10-23 液晶显示器反射板用白色聚酯膜
JP2007558371A JP5526477B2 (ja) 2006-10-27 2007-10-23 液晶ディスプレイ反射板用白色ポリエステルフイルム

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JP2011042784A (ja) * 2009-08-20 2011-03-03 Skc Co Ltd 白色多孔性ポリエステルフィルム、及びこの製造方法
CN102241100A (zh) * 2011-05-11 2011-11-16 武汉金牛经济发展有限公司 一种用于反射膜产生微孔和气泡的热压机及方法
JP2012131123A (ja) * 2010-12-22 2012-07-12 Toray Ind Inc 白色フィルムおよびそれを用いた面光源
WO2012145012A1 (fr) * 2011-04-18 2012-10-26 The Regents Of The University Of Michigan Architecture piégeant la lumière pour applications photovoltaïques et photodétecteurs
CN103029391A (zh) * 2012-12-29 2013-04-10 四川东方绝缘材料股份有限公司 复合双向拉伸光反射聚酯薄膜及其制造方法
CN103048710A (zh) * 2012-12-29 2013-04-17 四川东方绝缘材料股份有限公司 复合流涎法光反射片材及其制造方法
CN103048711A (zh) * 2012-12-29 2013-04-17 四川东材绝缘技术有限公司 复合双向拉伸光反射聚丙烯薄膜及其制造方法
WO2013099671A1 (fr) * 2011-12-26 2013-07-04 古河電気工業株式会社 Réflecteur, procédé pour fabriquer un réflecteur et panneau de rétroéclairage
WO2013108562A1 (fr) * 2012-01-17 2013-07-25 三菱樹脂株式会社 Matériau réfléchissant
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CN103818070A (zh) * 2013-12-13 2014-05-28 合肥乐凯科技产业有限公司 一种白色聚酯薄膜及其制备方法
JP2015121590A (ja) * 2013-12-20 2015-07-02 帝人デュポンフィルム株式会社 直下型面光源用白色反射フィルム
JP2016003262A (ja) * 2014-06-16 2016-01-12 帝人デュポンフィルム株式会社 ポリエステル樹脂組成物
WO2018123592A1 (fr) * 2016-12-27 2018-07-05 三井化学株式会社 Feuille de polyester

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KR20230091472A (ko) * 2021-12-16 2023-06-23 코오롱인더스트리 주식회사 광학 필름 및 이를 포함하는 표시장치
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JP2010215822A (ja) * 2009-03-18 2010-09-30 Mitsubishi Plastics Inc ポリエステルフィルム
JP2011042784A (ja) * 2009-08-20 2011-03-03 Skc Co Ltd 白色多孔性ポリエステルフィルム、及びこの製造方法
JP2012131123A (ja) * 2010-12-22 2012-07-12 Toray Ind Inc 白色フィルムおよびそれを用いた面光源
WO2012145012A1 (fr) * 2011-04-18 2012-10-26 The Regents Of The University Of Michigan Architecture piégeant la lumière pour applications photovoltaïques et photodétecteurs
US9412960B2 (en) 2011-04-18 2016-08-09 The Regents Of The University Of Michigan Light trapping architecture for photovoltaic and photodector applications
CN102241100A (zh) * 2011-05-11 2011-11-16 武汉金牛经济发展有限公司 一种用于反射膜产生微孔和气泡的热压机及方法
JP5416317B2 (ja) * 2011-12-26 2014-02-12 古河電気工業株式会社 反射板、およびバックライトパネル
JPWO2013099671A1 (ja) * 2011-12-26 2015-05-07 古河電気工業株式会社 反射板、およびバックライトパネル
WO2013099671A1 (fr) * 2011-12-26 2013-07-04 古河電気工業株式会社 Réflecteur, procédé pour fabriquer un réflecteur et panneau de rétroéclairage
WO2013108562A1 (fr) * 2012-01-17 2013-07-25 三菱樹脂株式会社 Matériau réfléchissant
CN103029391A (zh) * 2012-12-29 2013-04-10 四川东方绝缘材料股份有限公司 复合双向拉伸光反射聚酯薄膜及其制造方法
CN103029391B (zh) * 2012-12-29 2015-02-25 四川东方绝缘材料股份有限公司 复合双向拉伸光反射聚酯薄膜及其制造方法
CN103048711A (zh) * 2012-12-29 2013-04-17 四川东材绝缘技术有限公司 复合双向拉伸光反射聚丙烯薄膜及其制造方法
CN103048710A (zh) * 2012-12-29 2013-04-17 四川东方绝缘材料股份有限公司 复合流涎法光反射片材及其制造方法
CN103818070A (zh) * 2013-12-13 2014-05-28 合肥乐凯科技产业有限公司 一种白色聚酯薄膜及其制备方法
CN103818070B (zh) * 2013-12-13 2017-02-15 合肥乐凯科技产业有限公司 一种白色聚酯薄膜及其制备方法
JP2015121590A (ja) * 2013-12-20 2015-07-02 帝人デュポンフィルム株式会社 直下型面光源用白色反射フィルム
CN103707588A (zh) * 2013-12-26 2014-04-09 深圳市新纶科技股份有限公司 一种抗静电薄膜及其制备方法
CN103707588B (zh) * 2013-12-26 2016-01-20 深圳市新纶科技股份有限公司 一种抗静电薄膜及其制备方法
JP2016003262A (ja) * 2014-06-16 2016-01-12 帝人デュポンフィルム株式会社 ポリエステル樹脂組成物
WO2018123592A1 (fr) * 2016-12-27 2018-07-05 三井化学株式会社 Feuille de polyester
JPWO2018123592A1 (ja) * 2016-12-27 2019-10-31 三井化学株式会社 ポリエステルシート
US10870738B2 (en) 2016-12-27 2020-12-22 Mitsui Chemicals, Inc. Polyester sheet

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