CN101855081A - Multilayer film - Google Patents

Multilayer film Download PDF

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Publication number
CN101855081A
CN101855081A CN200880115237A CN200880115237A CN101855081A CN 101855081 A CN101855081 A CN 101855081A CN 200880115237 A CN200880115237 A CN 200880115237A CN 200880115237 A CN200880115237 A CN 200880115237A CN 101855081 A CN101855081 A CN 101855081A
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China
Prior art keywords
film
coating
weight
coating layer
fluorophor
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CN200880115237A
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Chinese (zh)
Inventor
大宅太郎
井口淳
楠目博
小山松淳
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Toyobo Film Solutions Ltd
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Teijin DuPont Films Japan Ltd
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Publication of CN101855081A publication Critical patent/CN101855081A/en
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    • 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
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Materials Engineering (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)

Abstract

Disclosed is a multilayer film composed of a polyester film and a coating layer formed thereon and containing a phosphor. The multilayer film is characterized in that the phosphor in the coating layer is composed of an inorganic material, and the phosphor content in the coating layer is within the range of 5-80% by weight. The multilayer film is suppressed in yellowing over time, while having high luminance and less color shift. The multilayer film is suitable for reflector plates.

Description

Stack membrane
Technical field
The stack membrane of the coating layer that the present invention relates to comprise polyester film and be provided with thereon.
Background technology
In recent years, be that the liquid crystal indicator of representative is popularized just rapidly with the LCD TV.Liquid crystal indicator possesses the sidelight mode usually or directly descends the back light unit of mode.In the back light unit of LCD TV, adopt straight light mode down.In this mode, at liquid crystal cell be configured between the reflecting plate of its depths, be set up in parallel cold cathode ray tube.The reflecting plate that uses in the back light unit of liquid crystal indicator requires the highly reflective energy.At present, as this reflecting plate, use the film or the inner film that contains micro air bubble that contain Chinese white.The film that contains Chinese white in inside be because can obtain the brightness of high brightness and homogeneous, so be widely used, for example is disclosed in that the spy opens the 2004-050479 communique, the spy opens the 2004-330727 communique.In addition, the film that contains micro air bubble in inside for example is disclosed in that the spy opens flat 6-322153 communique, the spy opens flat 7-118433 communique.
As the method for the brightness that improves back light unit, proposed to improve the reflectivity of the film that uses in the reflecting plate itself, in addition fluorescent whitening agent is coated on the scheme (spy opens the 2002-40214 communique) on the film.But coating is during fluorescent whitening agent, causes the fluorescent whitening agent deterioration from the ultraviolet light of cold cathode ray tube emission, film through the time xanthochromia.
Summary of the invention
The problem that invention solves
Problem of the present invention be to provide suppressed through the time xanthochromia stack membrane.The stack membrane of high brightness can be provided when also being to provide the member as the back light unit of liquid crystal indicator to use problem of the present invention.Problem of the present invention also be to provide inhibition through the time xanthochromia, can access the stack membrane that high brightness, colour cast are few, be suitable as reflecting plate.
Be used to solve the means of problem
That is, the present invention is a kind of stack membrane, is the stack membrane that comprises polyester film and the coating layer that contains fluorophor disposed thereon, it is characterized in that the fluorophor of coating layer comprises inorganic substances, and the content of this fluorophor in coating layer is 5～80 weight %.
The specific embodiment
Below describe the present invention in detail.
(coating layer)
In the present invention, to comprise inorganic substances extremely important for the fluorophor of coating layer.By using the fluorophor that comprises inorganic substances, can obtain the few stack membrane of colour cast as fluorophor.On the other hand, use when comprising the fluorophor of organic substance as fluorophor, fluorophor is by ultraviolet light degradation, makes the stack membrane xanthochromia at the long-term middle-ultraviolet lamp that uses.
The composition of the per 100 weight % coating layers of coating layer contains 5～80 weight %, preferably contains the fluorophor that 15～50 weight % comprise inorganic substances.If less than 5 weight % then in order to use, can't fully keep high brightness when using white films as film in the purposes of reflecting plate.On the other hand, when surpassing 80 weight %, can't obtain the coating layer of homogeneous, be difficult to film integral body and suppress xanthochromia equably.
Consider that from the viewpoint of the xanthochromia of effective inhibition film coating layer preferably contains the compound with ultraviolet absorption ability.When coating layer contained the compound with ultraviolet absorption ability, its content was the composition of per 100 weight % coating layers, for example was 20～95 weight %, was preferably 20～50 weight %.Compound with ultraviolet absorption ability can also can be polymer electrolyte for low molecule-type.As the compound of polymer electrolyte, for example can use the low molecular weight polycaprolactone that will have ultraviolet absorption ability to be combined in compound on high molecular main chain or the side chain.The compound with ultraviolet absorption ability of this polymer electrolyte has the function as adhesive, so preferred.
Coating layer preferably except the compound with ultraviolet absorption ability, also contains the resin as adhesive.When coating layer contains adhesive resin, adhesive resin can account for the part beyond the fluorophor that comprises inorganic substances in the composition of coating layer, perhaps account for the fluorophor that comprises inorganic substances and have the compound part in addition of ultraviolet absorption ability in the composition of coating layer.
Constitute the mentioned component dissolving of coating layer or be dispersed in the organic solvent and use as coating fluid.
As adhesive resin, for example can use polyester, polyurethane, acrylic acid, polyamide, polyethylene, polypropylene, polyvinyl chloride, Vingon, polystyrene, polyvinyl acetate base ester, fluorine-type resin and their copolymer, the mixture more than 2 kinds etc.In addition, also can use the compound that will have ultraviolet absorption ability adhesive resin as the copolymer composition copolymerization.
The thickness of coating layer is preferably 2～10 μ m.By being the thickness of this scope, can access the stack membrane that inorganic phosphor is difficult to come off and possesses good slickness.
(fluorophor that comprises inorganic substances)
The fluorophor of the preferred excitation wavelength of the fluorophor that comprises inorganic substances in 400～450nm scope among the present invention.The fluorophor that comprises inorganic substances of the excitation wavelength by using this scope can access high brightness when using as reflecting plate, can obtain not having absorbing the painted stack membrane that causes.Below, sometimes " fluorophor that comprises inorganic substances " abbreviated as " inorganic phosphor ".
The inorganic phosphor of the preferred glow peak wavelength of inorganic phosphor among the present invention in 500～600nm scope.The not enough 500nm of emission wavelength or when surpassing 600nm, the brightness raising effect when using as reflecting plate is few, so not preferred.
As the inorganic phosphor of the important document that satisfies above-mentioned excitation wavelength and glow peak wavelength, can use with alkaline-earth metal sulfide, alkaline-earth metal composite oxides or lanthanum orthophosphate compound with rock salt crystal structure as parent, contain the inorganic phosphor of activating substance.
As alkaline-earth metal sulfide, for example can use zinc sulphide (ZnS), strontium sulfide (SrS), yittrium oxide (Y 2O 2).
As the alkaline-earth metal composite oxides, for example can use barium Mg-Al composite oxide (BaMgAl 10O 17).
As activating substance, for example can use Eu, Cu, Mn, Al, Ce, Tb, Ba, Sr, Ag, and then as combination, for example can use the combination of combination, Ba, Sr and Eu of combination, Ba and Eu of combination, Ce and the Tb of Eu, Cu and Al.
Particularly preferred inorganic phosphor is with strontium sulfide (SrS) or yittrium oxide (Y 2O 2) for parent, contain the inorganic phosphor of europium (Eu) and/or copper (Cu) as activating substance, with barium Mg-Al composite oxide (BaMgAl 10O 17) for parent, contain the inorganic phosphor of europium (Eu) and/or manganese (Mn) as activating substance, with lanthanum orthophosphate (LaPO 4) for parent, contain the inorganic phosphor of Ce and/or Tb as activating substance.
When activating substance is Eu,, for example can use Eu as activator 2O 3At this moment, the activator Eu in the inorganic phosphor 2O 3Content be benchmark with the gross weight of inorganic phosphor, for example be 0.01～10 weight %.
When activating substance is Mn,, for example can use MnO as activator.At this moment, the content of the activator MnO in the inorganic phosphor is benchmark with the gross weight of inorganic phosphor, for example is 0.01～1 weight %.
When activating substance is Ce,, for example can use CePO as activator 4At this moment, the activator CePO in the inorganic phosphor 4Content be benchmark with the gross weight of inorganic phosphor, for example be 0.01～35 weight %.
When activating substance is Tb,, for example can use Tb as activator 4O 7At this moment, the activator Tb in the inorganic phosphor 4O 7Content be benchmark with the gross weight of inorganic phosphor, for example be 0.01～25 weight %.
When activating substance is Cu,, for example can use Cu as activator 2S.At this moment, the activator Cu in the inorganic phosphor 2The content of S is benchmark with the gross weight of inorganic phosphor, for example is 0.01～1 weight %.
When activating substance is Al,, for example can use Al as activator 2S 3At this moment, the activator Al in the inorganic phosphor 2S 3Content be benchmark with the gross weight of inorganic phosphor, for example be 0.01～1 weight %.
Inorganic phosphor can use for example emboliform inorganic phosphor, and it doesn't matter for the shape of particle, for example can use spherical inorganic phosphor.The average grain diameter of particle for example is 2～10 μ m, is preferably 3～7 μ m.The particle shape inorganic phosphor of the average grain diameter by using this scope can make its homogeneous in coating fluid disperse, and can obtain the coating layer that the fluorophor homogeneous distributes.
Inorganic phosphor is a product sold on the market, for example can use following product.
As the green emitting inorganic phosphor, can use 2210 (change into Optronix society system with ZnS as parent, be activating substance) with Cu, (special at all chemical society system is with La for E7031-2 2O 2S is parent, is activating substance with Eu), (special at all chemical society system is with SrAl for E4011-1 2O 4For parent, with Eu is activating substance).
As red inorganic phosphor, can use D1110 (special at all chemical society system, with Y 2O 3For parent, with Eu is activating substance).
As the blue inorganic fluorophor, can use D1230 (special at all chemical society system with SrS as parent, be activating substance), (special at all chemical society system is with BaMgAl for E2031-2 with Eu 10O 17For parent, with Eu is activating substance).
As green inorganic phosphor, can use KX732A (change into Optronix society system, with barium Mg-Al composite oxide (BaMgAl 10O 17) for parent, be activating substance with Eu and Mn).
As the yellow green inorganic phosphor, can use P22-GN4 (change into Optronix society system with ZnS as parent, be activating substance), LP-G2 (to change into Optronix society system with LaPO with Cu, Al 4For parent, with Ce, Tb is activating substance).
(compound) with ultraviolet absorption ability
As compound with ultraviolet absorption ability, for example can use organic compounds such as benzophenone, benzotriazole, cyanoacrylate, salicylic acid, triazines, benzoates, oxanilide class, in addition, can use mineral-type compounds such as collosol and gel.The compound with ultraviolet absorption ability of organic class also can use with the form of copolymerization on polymer.
Below enumerate compound with ultraviolet absorption ability.
As benzophenone compound; can enumerate 2; 4-dihydroxy benaophenonel, 2-hydroxyl-4-methoxy benzophenone, 2-hydroxyl-4-methoxyl group-5-diphenylsulfone ketone, 2; 2 '-4; 4 '-tetrahydroxybenzophenone, 2; 2 '-dihydroxy-4-methoxy benzophenone, 2,2 '-dihydroxy-4,4 '-dimethoxy-benzophenone, two (2-methoxyl group-4-hydroxyl-5-benzoyl phenyl) methane.
As benzotriazole compound, can enumerate 2-(2 '-hydroxyl-5 '-aminomethyl phenyl) BTA, 2-(2 '-hydroxyl-5 '-tert-butyl-phenyl) BTA, 2-(2 '-hydroxyl-3 ', 5 '-two-tert-butyl-phenyl) BTA, 2-(2 '-hydroxyl-the 3 '-tert-butyl group-5 '-aminomethyl phenyl)-5-chlorobenzotriazole, 2-(2 '-hydroxyl-3 ', 5 '-two-tert-butyl-phenyl)-the 5-chlorobenzotriazole, 2-(2 '-hydroxyl-5 '-tert-octyl phenol) BTA, 2-(2 '-hydroxyl-3 ', 5 '-two-tertiary pentyl phenyl) BTA, 2, [4-(1 for 2 '-di-2-ethylhexylphosphine oxide, 1,3, the 3-tetramethyl butyl)-6-(2H-BTA-2-yl) phenol], 2-(2 '-hydroxyl-5 '-methacryloxy phenyl)-2H-BTA, 2-[2 '-hydroxyl-3 '-(3 "; 4 " 5 "-5 '-aminomethyl phenyl, 6 " tetrahydric phthalimide methyl)] BTA.
As cyanoacrylate compound, can enumerate ethyl-2-cyano group-3,3 '-diphenylacrylate ester.
As salicylic acid compounds, can enumerate tert-butyl-phenyl salicylate, OPS p octylphenyl salicylate.
(polyester film)
As polyester film, use the film that comprises the thermoplasticity aromatic polyester.As the thermoplasticity aromatic polyester, for example can enumerate PETG, PEN, polybutylene terephthalate (PBT).Above-mentioned polyester also can the copolymerization copolymer composition.At this moment, the ratio of copolymer composition is to be that benchmark is for example 20 moles of ratios below the % with whole dicarboxylic acids compositions.
When stack membrane of the present invention is used as reflecting plate, preferably use white polyester film as polyester film.
As white polyester film, can use for example will in polyester, cooperate the composition of particle or cooperate sheet material with the composition of the immiscible resin of polyester to stretch, make when stretching the interface of the interface of polyester and particle or polyester and immiscible resin to peel off, formed the white polyester film of fine voids in film inside.As particle, for example can use inorganic particulate, organic filler, their compound particle.
As white polyester film, the preferred white laminated film that comprises the reflecting layer and support its supporting layer that uses.At this moment, the xanthochromia for the inhibitory reflex layer is arranged on coating layer on the reflecting layer.
The voidage rate in the reflecting layer in the white laminated film is preferably 30～80%, and more preferably 35～75%, be preferably 38～70% especially.This voidage rate can be peeled off the generation space by the interface that makes polyester and particle or immiscible resin and obtain when stretching.
When using particle as interstitial material, the average grain diameter of particle is preferably 0.3～3.0 μ m, and more preferably 0.4～2.5 μ m is preferably 0.5～2.0 μ m especially.During average grain diameter less than 0.3 μ m, aggegation takes place easily, thus not preferred, if surpass 3.0 μ m, then cause the film fracture probably, so not preferred.The polymer blend in per 100 weight portion reflecting layer, preferably contain 31～60 weight portions, more preferably contain 35～55 weight portions, especially preferably contain 37～50 weight portion particles.If less than 31 weight %, then reflectivity reduces, or the deterioration that ultraviolet ray causes becomes seriously, so not preferred.If surpass 60 weight %, then film breaks easily, so not preferred.As particle, preferred inorganic particulate.
Consider from the viewpoint that obtains extra high reflecting properties, preferably use Chinese white.As Chinese white, for example use the particle of titanium oxide, barium sulfate, calcium carbonate, silica, preferably use the barium sulfate particle.By using the barium sulfate particle, can obtain good especially reflectivity.The barium sulfate particle can be any shape in tabular, spherical.
In addition, as organic filler, for example can use the immiscible resin particle of following explanation.
When using immiscible resin as interstitial material, as immiscible resin, can use for example vistanex, polystyrene resin, particularly, for example can use poly--3-methyl butene-1, poly--4-methylpentene-1, polyethylene, polypropylene, polyvinyl-uncle's butane, 1,4-trans-poly--2,3-dimethyl butadiene, polyvinyl eyclohexane, polystyrene, poly-fluorobenzene ethene, cellulose ethanoate cellulose propionate, polychlorotrifluoroethylene especially preferably use polypropylene, polymethylpentene.Because the resin of polypropylene, polymethylpentene is originally transparent as height,, improve reflectivity, the most suitable use so can suppress light absorption.
When using immiscible resin, the composition of the polyester in per 100 weight portion reflecting layer, preferably with 5～30 weight portions, more preferably with 8～25 weight portions, especially preferably use with the ratio of 10～20 weight portions.Cooperate in the reflecting layer when surpassing 30 weight portions, film is very easy to fracture, so not preferred, if less than 5 weight portions then do not form enough spaces, the reflectivity of film reduces, thus not preferred, poor to ultraviolet patience in addition, so not preferred.
Supporting layer comprises polymer blend, per this polymer blend of 100 weight portions, preferably contain 0.5～30 weight %, more preferably contain 1～27 weight %, especially preferably contain 2～25 weight % inorganic particulates.During less than 0.5 weight %, can't obtain sufficient slickness, thus not preferred, if surpass 30 weight %, then can't keep intensity as the supporting layer of supporting reflex layer, cause the film fracture, so not preferred.
The average grain diameter of inorganic particulate is preferably 0.1～5 μ m, and more preferably 0.5～3 μ m is preferably 0.6～2 μ m especially.During less than 0.1 μ m, particles aggregate takes place easily, thus not preferred, when surpassing 5 μ m, form thick projection, cause the film fracture, so not preferred.
(manufacture method)
Below, be the method that stack membrane of the present invention is made in the example explanation with the stack membrane that coating layer is set on the white polyester film that comprises the reflecting layer of containing the barium sulfate particle and supporting layer.
The cooperation of barium sulfate particle in polymer blend can be carried out when polyester, also can carry out after polymerization.Under the situation of carrying out during polymerization, can before ester exchange reaction or esterification end, cooperate, also can begin preceding cooperation in polycondensation reaction.
Under the situation of carrying out after the polymerization,, carry out melting mixing and get final product as long as be added in the polyester after the polymerization.At this moment, make the master batch that contains the barium sulfate particle with higher concentration, it is engaged in the polyester granulate of barium sulfate-containing particle not, can obtain containing the polymer blend of barium sulfate particle thus with desirable containing ratio.
Filter during as the system film, the preferred use comprises the nonwoven type filters stainless steel fine rule of line footpath below 15 μ m, average mesh 10～100 μ m, preferred average mesh 20～50 μ m, filters polymer blend.By carrying out this filtration, can suppress usually the aggegation that aggegation easily becomes the particle of thick agglutination particle, obtain the film of thick few foreign.
To make not stretched sheet of lamination from the polymer blend of the fusion of mould multilayer extrusion molding when using feed mechanism.That is, become reflecting layer/supporting layer, in mould, launch, implement to extrude constituting the fused mass of polymer blend in reflecting layer and the fused mass use feed mechanism lamination that constitutes the polymer blend of supporting layer.At this moment, keep the form of lamination with the polymer blend of feed mechanism lamination.
The not stretched sheet of being extruded by mould rouses cooling curing by curtain coating, becomes unstretching film.
The coating fluid that uses in being coated with of coating layer preferably is coated with to this unstretching film or to the vertical stretched film through subsequently vertical stretching.
The shape film that will not stretch heats by roller heating, infrared ray heating etc., at longitudinal stretching, obtains vertical stretched film.Preferably utilize 2 difference to carry out this stretching with top roll.Draft temperature is preferably the above temperature of vitrification point (Tg) of polyester, the more preferably temperature of Tg～(Tg+70 ℃).Though stretching ratio also depends on the characteristic that requires of purposes, vertically and perpendicular to direction (hereinafter referred to as laterally) longitudinally all be preferably 2.2～4.0 times, more preferably 2.3～3.9 times.If 2.2 times of less thaies, then the uneven thickness variation of film can't obtain good film, if surpass 4.0 times, then ruptures easily in the system film, so not preferred.
Next, vertical stretched film is carried out horizontal stretching, thermal finalization, hot relaxation processes successively make Biaxially oriented film, the limit is moved film, and above-mentioned processing is carried out on the limit.The processing of horizontal stretching is from the temperature of the vitrification point (Tg) that is higher than polyester, and the limit is warmed up to the temperature limit of (Tg+5)～(Tg+70) ℃ and carries out.Intensification in horizontal drawing process can be carried out continuously, also can carry out by substep (one by one), heats up one by one usually.For example the horizontal drawing zone of stenter is divided into a plurality ofly along the film moving direction, the heat medium by inflow set point of temperature in each district heats up.The multiplying power of horizontal stretching is preferably 2.5～4.5 times, more preferably 2.8～3.9 times.During 2.5 times of less thaies, the uneven thickness variation of film can't obtain good film, thus not preferred, when surpassing 4.5 times, in the system film, rupture easily, so not preferred.
Film after the horizontal stretching can be heat-treated in (Tm-20)～(Tm-100) ℃ tentering or under the amount of decrease condition below 10% catching under the state at two ends, reduces percent thermal shrinkage.If be higher than the temperature of this temperature, the flatness variation of film then, it is big that uneven thickness becomes, so not preferred.If heat treatment temperature is lower than (Tm-100) ℃, then percent thermal shrinkage becomes big.
After heat treatment, film temperature is recovered in the process of normal temperature, in order to adjust the thermal shrinking quantity of film in the temperature province of (Tm-20)～(Tm-100) ℃, the two ends that can cut the film of catching are adjusted film and are reclaimed speed longitudinally, make longitudinal relaxation.In order to relax, only need the speed of the roller group of adjustment stenter outlet side to get final product.The lax speed that can reduce the roller group with respect to the film linear velocity of stenter preferably reduces speed 0.1～1.5%, more preferably reduces by 0.2～1.2%, especially preferably reduces by 0.3～1.0%.M flac is adjusted percent thermal shrinkage longitudinally as described above.In addition, film laterally also can obtain desirable percent thermal shrinkage reducing width up to the process of cutting away two ends.
Herein, be that example has been described in detail with situation about stretching by biaxial stretch-formed method one by one, but stack membrane of the present invention also can be by biaxial stretch-formed method one by one, any method in the biaxial stretch-formed method stretches simultaneously.
Coating layer can be set directly on the polyester film of base material among the present invention, but cohesive is when not enough, preferably Corona discharge Treatment is carried out on the surface of polyester film or primary coat is handled.Primary coat is handled can be arranged on (online rubbing method) in the polyester film manufacturing process, also can be with polyester film coating (off-line rubbing method) separately after manufacturing.The material that uses during primary coat is handled only needs suitably to select to get final product, and as preferable material, can use copolyester, polyurethane, acrylic acid, various coupling agent.
The coating layer that contains inorganic phosphor can be coated with by any means.For example can use intaglio plate, roller, spin coating, reverse roll, rod, screen cloth, impregnating method.Curing after the coating can use known method.For example can applied heat solidify, use the method for ultraviolet ray, electron ray, radioactive ray isoreactivity ray.Coating can be carried out before the crystalline orientationization of film is finished when making polyester film, also can carry out after the crystalline orientation of film is finished.
Embodiment
Below, describe the present invention in detail by embodiment.
In addition, measure by the following method and estimate.
(1) thickness of film
Membrane sample is measured 10 dot thickness with electric micrometer (Anritsu makes K-402B), obtain mean value, as film thickness.
(2) thickness of coating layer
Sample is cut into triangle, be fixed in the embedding capsule after, use the epoxy resin embedding.Then, after vertically cut film becomes parallel section with slicer (ULTRACUT-S) by the sample of embedding, use light microscope to observe photography, measure the thickness ratio of coating layer and film by photo, calculate by the film integral thickness, obtain the thickness of coating layer.
(3) the luminous and glow peak wavelength of excitation wavelength 400～450nm
Use sepectrophotofluorometer F-4500 (Hitachi's system), choose the stimulated luminescence spectrum in excitation wavelength 400～450nm scope and the emission wavelength 300～800nm scope, have or not fluorescence radiation based on following benchmark evaluation.The face that is provided with the coating layer that contains fluorophor is measured.For the sample that fluorescence radiation is arranged, obtain the glow peak wavelength by stimulated luminescence spectrum.
◎: fluorescence radiation is arranged
*: no fluorescence radiation
(4) through the time xanthochromia
With high-pressure sodium lamp (Harison Toshiba Lighting system " TOSCURE 401 ": the band glass filter) carry out illumination in 50 hours and penetrate, observe the look variation that front and back are penetrated in illumination.Irradiation level when illumination is penetrated is 18mW/cm 2Film constitute 2 layers of reflecting layer/supporting layers time, carry out illumination from the reflecting layer side and penetrate, measure.
Measure the film tone (L at initial stage with colour difference meter (Japanese electric look industry system SZS-∑ 90 COLOR MEASURINGSYSTEM) 1 *, a 1 *, b 1 *) and postradiation film tone (L 2 *, a 2 *, b 2 *), calculate the tone variations dE* that following formula is represented, estimate based on following benchmark.
dE *＝{(L 1 *-L 2 *) 2+(a 1 *-a 2 *) 2+(b 1 *-b 2 *) 2} 1/2
◎：dE *≤5
○：5＜dE *≤10
△：10＜dE *≤15
×：15＜dE *
(5) average grain diameter
On scanning electron microscope (SEM) sample bench, paste two-sided tape, put the particle of the powder state before adding in the polyester thereon thinly, behind the carbon evaporation, use scanning electron microscope (SEM), according to the big or small appropriate change multiplying power of particle, take pictures.Obtain the round equivalent diameter of the particle more than at least 100 with image processing apparatus,, obtain the average grain diameter (μ m) of number benchmark divided by particle number.
(6) brightness and colourity
When determination object is white polyester film (embodiment 1～5 and comparative example 1～3), estimate with the method for record in following (6-1)～(6-5).
(6-1) make the evaluation back light unit
From the LCD TV of preparing for evaluation (the system AQUOS LC-20S4 of SHARP society), take out Staight downward type backlight unit (20 inches), replace originally being installed in the light-reflecting sheet in the back light unit, the film of determination object is installed, make to estimate and use back light unit.
The shady face of estimating with back light unit is divided into 2 * 2 such 4 districts, lights backlightly, use the system BM-7 of Topcon society luminance meter, making and measuring the angle is that 1 °, luminance meter and distance backlight are 50cm, measures the brightness and the colourity in front after 1 hour.4 districts to shady face measure respectively, and the arithmetic mean of instantaneous value of obtaining brightness is as mean flow rate, and the arithmetic mean of instantaneous value of obtaining colourity is as mean flow rate.
(6-2) brightness raising rate
The film that contains with coating before the coating layer of fluorophor is a determination object, measures mean flow rate before the coating with the method for above-mentioned (6-1).Next, the film that contains with coating behind the coating layer of fluorophor is a determination object, measures mean flow rate after the coating with the method for above-mentioned (6-1).Use following formula to calculate brightness raising rate by the mean flow rate that obtains.
Brightness raising rate (%)
=(mean flow rate after the coating)/(mean flow rate before the coating) * 100
(6-3) colour difference
The film that contains with coating before the coating layer of fluorophor is a determination object, measures average chrominance (x, y) before the coating with the method for above-mentioned (6-1).Next, the film that contains with coating behind the coating layer of fluorophor is a determination object, measures average chrominance (x, y) after the coating with the method for above-mentioned (6-1).By the average chrominance that obtains (x, y), use following formula to calculate colour difference Δ xy.
Δxy＝(Δx 2+Δy 2) 1/2
Δ x=(the x composition of the average chrominance after the coating)-(the x composition of the average chrominance before the coating)
Δ y=(the y composition of the average chrominance after the coating)-(the y composition of the average chrominance before the coating)
The Δ xy that use obtains is based on following benchmark evaluation colour difference Δ xy.
◎：Δxy＜0.05
○：0.05≤Δxy＜0.10
×：0.10≤Δxy
(6-4) the brightness sustainment rate in the endurancing
The film (film before the endurancing) that contains with coating behind the coating layer of fluorophor be a determination object, with the method mensuration mean flow rate of above-mentioned (6-1).Next, keep lighting state backlight through carrying out endurancing in 3000 hours.For film, with the mean flow rate after the method mensuration endurancing of above-mentioned (6-1) through endurancing.
Calculate the brightness sustainment rate with following formula.
Brightness sustainment rate (%)
=(mean flow rate after the endurancing)/(mean flow rate before the endurancing) * 100
(6-5) colourity in the endurancing changes
The film (film before the endurancing) that contains with coating behind the coating layer of fluorophor be a determination object, with the method mensuration average chrominance (x, y) of above-mentioned (6-1).Next, keep lighting state backlight through carrying out endurancing in 3000 hours.To through the film of the endurancing average chrominance (x, y) after with the method mensuration endurancing of above-mentioned (6-3).Use following formula to calculate Δ xy by the average chrominance that obtains (x, y).
Δxy＝(Δx 2+Δy 2) 1/2
Δ x=(the x composition of the average chrominance after the endurancing)-(the x composition of the average chrominance before the endurancing)
Δ y=(the y composition of the average chrominance after the endurancing)-(the y composition of the average chrominance before the endurancing)
The Δ xy that use obtains is based on following benchmark evaluation colourity changes delta xy.
◎：Δxy＜0.05
○：0.05≤Δxy＜0.10
×：0.10≤Δxy
(7) brightness and colourity
When determination object is transparent polyester film (embodiment 6 and comparative example 4), estimate with the method for record in following (7-1)～(7-5).
(7-1) make the evaluation back light unit
From the LCD TV of preparing for evaluation (the system AQUOS LC-20S4 of SHARP society), take out Staight downward type backlight unit (20 inches), replace originally being installed in the light diffusing sheet material in the back light unit, the film of determination object is installed, make to estimate and use back light unit.
The shady face of estimating with back light unit is divided into 2 * 2 such 4 districts, lights backlightly, use the system BM-7 of Topcon society luminance meter, making and measuring the angle is that 1 °, luminance meter and distance backlight are 50cm, measures the brightness and the colourity in front after 1 hour.4 districts to shady face measure respectively, and the arithmetic mean of instantaneous value of obtaining brightness is as mean flow rate, and the arithmetic mean of instantaneous value of obtaining colourity is as mean flow rate.
(7-2) brightness raising rate
The film that contains with coating before the coating layer of fluorophor is a determination object, measures mean flow rate before the coating with the method for above-mentioned (7-1).Next, the film that contains with coating behind the coating layer of fluorophor is a determination object, measures mean flow rate after the coating with the method for above-mentioned (7-1).Use following formula to calculate brightness raising rate by the mean flow rate that obtains.
Brightness raising rate (%)
=(mean flow rate after the coating)/(mean flow rate before the coating) * 100
(7-3) colour difference
The film that contains with coating before the coating layer of fluorophor is a determination object, measures average chrominance (x, y) before the coating with the method for above-mentioned (7-1).Next, the film that contains with coating behind the coating layer of fluorophor is a determination object, measures average chrominance (x, y) after the coating with the method for above-mentioned (7-1).By the average chrominance that obtains (x, y), use following formula to calculate colour difference Δ xy.
Δxy＝(Δx 2+Δy 2) 1/2
Δ x=(the x composition of the average chrominance after the coating)-(the x composition of the average chrominance before the coating)
Δ y=(the y composition of the average chrominance after the coating)-(the y composition of the average chrominance before the coating)
The Δ xy that use obtains is based on following benchmark evaluation colour difference Δ xy.
◎：Δxy＜0.05
○：0.05≤Δxy＜0.10
×：0.10≤Δxy
(7-4) the brightness sustainment rate in the endurancing
The film (film before the endurancing) that contains with coating behind the coating layer of fluorophor be a determination object, with the method mensuration mean flow rate of above-mentioned (7-1).Next, keep lighting state backlight through carrying out endurancing in 3000 hours.For film, with the mean flow rate after the method mensuration endurancing of above-mentioned (7-1) through endurancing.
Calculate the brightness sustainment rate with following formula.
Brightness sustainment rate (%)
=(mean flow rate after the endurancing)/(mean flow rate before the endurancing) * 100
(7-5) colourity in the endurancing changes
The film (film before the endurancing) that contains with coating behind the coating layer of fluorophor be a determination object, with the method mensuration average chrominance (x, y) of above-mentioned (7-1).Next, keep lighting state backlight through carrying out endurancing in 3000 hours.To through the film of the endurancing average chrominance (x, y) after with the method mensuration endurancing of above-mentioned (7-3).Use following formula to calculate Δ xy by the average chrominance that obtains (x, y).
Δxy＝(Δx 2+Δy 2) 1/2
Δ x=(the x composition of the average chrominance after the endurancing)-(the x composition of the average chrominance before the endurancing)
Δ y=(the y composition of the average chrominance after the endurancing)-(the y composition of the average chrominance before the endurancing)
The Δ xy that use obtains is based on following benchmark evaluation colourity changes delta xy.
◎：Δxy＜0.05
○：0.05≤Δxy＜0.10
×：0.10≤Δxy
Reference example 1 (manufacturing white polyester film)
(the total dicarboxylic acids composition with polyester is a benchmark with 132 weight portion dimethyl terephthalate (DMT)s, 18 weight portion DMIPs, be 12 moles of %), 96 weight portion ethylene glycol, 3.0 weight portion diethylene glycol (DEG)s, 0.05 weight portion manganese acetate, 0.012 weight portion lithium acetate put into the flask that possesses rectifying column, distillates condenser, be heated to 235 ℃ from 150 ℃ while stirring, distillate methyl alcohol, carry out ester exchange reaction.After methyl alcohol distillates, add 0.03 weight portion trimethyl phosphate, 0.04 weight portion germanium dioxide, reactant is moved in the reactor.Slowly will be decompressed to 0.5mmHg in the reactor while stirring then, be warming up to 290 ℃ simultaneously, carry out polycondensation reaction.It is 2.5 weight % that the diethylene glycol (DEG) of the copolyester that obtains becomes component, and Ge element content is 50ppm, and elemental lithium content is 5ppm.
In this polyester, add the barium sulfate particle of 50 weight % average grain diameters, 1.5 μ m, obtain the reflecting layer polymer blend.In addition, add the barium sulfate particle of 5 weight % average grain diameters, 1.5 μ m in this polyester, layer polymer blend is supported.Each composition is supplied with 2 extruders that are heated to 280 ℃, is 3/1 by the thickness ratio of reflecting layer/supporting layer, uses 2 layers of feed mechanism device to make its interflow, and lamination is 2 layers, keeps this layer-by-layer state to be extruded by mould, is shaped to 2 layers of sheet.With its drum cooler cooling curing with 25 ℃ of surface temperatures, make unstretching film, and then be heated to 95 ℃, stretch at long axis direction (vertically), with 25 ℃ roller group cooling.Then, the two ends that the film after vertical the stretching is clamped with cloth gripper in the limit, the limit imports stenter, in being heated to 120 ℃ atmosphere gas to direction (laterally) stretching perpendicular to long axis direction.Then, in stenter, under 200 ℃ temperature, carry out thermal finalization, under 130 ℃ temperature, the longitudinal relaxation and the width of cloth that laterally contracts are carried out 0.5%, 1% respectively, be cooled to room temperature, obtain the biaxially oriented polyester film of gross thickness 188 μ m.
Reference example 2 (manufacturing transparent polyester film)
96 weight portion dimethyl terephthalate (DMT)s, 58 weight portion ethylene glycol and 0.03 weight portion manganese acetate are put into reactor respectively, the limit under agitation makes interior temperature reach 240 ℃ and distillates methyl alcohol, ester exchange reaction is carried out on the limit, this ester exchange reaction is added 0.097 weight portion trimethyl phosphate and 0.041 weight portion antimony trioxide after finishing.Then product is heated up, finally under high vacuum, 280 ℃ condition, carry out polycondensation, obtain intrinsic viscosity ([η]) and be 0.64 polyester granulate.
The polyester granulate that obtains at 160 ℃ down after dry 3 hours, is melt extruded under 280 ℃, carry out cooling curing, obtain unstretching film with the drum cooler of 20 ℃ of surface temperatures.Then, be heated to 95 ℃, stretch 3.2 times at long axis direction (vertically), after 25 ℃ roller group cooling, the two ends of indulging the film after stretching are clamped on the limit with cloth gripper, the limit imports stenter, after perpendicular to 3.6 times of direction (laterally) stretchings of long axis direction, carries out thermal finalization under 220 ℃ temperature in being heated to 120 ℃ atmosphere gas.Then, in stenter, under 130 ℃ temperature, the longitudinal relaxation and the width of cloth that laterally contracts are carried out 0.5%, 1% respectively, be cooled to room temperature, obtain biaxially-stretched film.
Embodiment 1 (example of white polyester film)
In toluene/butyl acetate mixed solution, making solid component concentration is the coating fluid of 45 weight % with following composition dissolves.As toluene/butyl acetate mixed solution, the operating weight ratio is 1: 1 a mixed solution.
(coating fluid solid constituent composition)
Green emitting inorganic phosphor 2210 (changing into Optronix society system) 30 weight portions
Ultraviolet radiation absorption material UW UV6010 (Japanese catalyst society system) 15 weight portions
This coating fluid is coated on the reflecting layer of the white polyester film that obtains in the reference example 1, making dried thickness is 5 μ m, 150 ℃ of following heated-air dryings 2 minutes, obtains coated film.
The brightness climbing of the coated film that obtains is 104%.Other evaluation results are shown in table 1.
In addition, green emitting inorganic phosphor 2210 (changing into Optronix society system) be parent with ZnS, be the inorganic phosphor of activating substance with Cu.
Embodiment 2 (example of white polyester film)
Change the fluorescent material of coating fluid into red inorganic phosphor D1110 (special at all chemical society system), in addition, obtain coated film similarly to Example 1.Evaluation result is shown in table 1.
In addition, red inorganic phosphor D1110 (special at all chemical society system) is with Y 2O 3For parent, with Eu is the inorganic phosphor of activating substance.
Embodiment 3 (example of white polyester film)
Change the fluorescent material of coating fluid into blue inorganic fluorophor D1230 (special at all chemical society system), in addition, obtain coated film similarly to Example 1.Evaluation result is shown in table 1.
In addition, blue inorganic fluorophor D1230 (special at all chemical society system) be parent with SrS, be the inorganic phosphor of activating substance with Eu.
Embodiment 4 (example of white polyester film)
Change the fluorescent material of coating fluid into green inorganic phosphor KX732A (changing into Optronix society system), in addition, obtain coated film similarly to Example 1.Evaluation result is shown in table 1.
In addition, green inorganic phosphor KX732A (changing into Optronix society system) is with barium Mg-Al composite oxide (BaMgAl 10O 17) for parent, be the inorganic phosphor of activating substance with Eu and Mn.
Embodiment 5 (example of white polyester film)
Change the ultraviolet radiation absorption material into acryloid cement UW S-2840 (Japanese catalyst society system), in addition, obtain coated film similarly to Example 1.Brightness raising rate is 104%.Evaluation result is shown in table 1.
Comparative example 1 (example of white polyester film)
In toluene/butyl acetate mixed solution, making solid component concentration is the coating fluid of 45 weight % with following composition dissolves.In addition, as toluene/butyl acetate mixed solution, the operating weight ratio is 1: 1 a mixed solution.
(coating fluid solid constituent composition)
Organic optical brightener OB-1 (EASTMAN society system) 5 weight portions
Ultraviolet radiation absorption material UW UV6010 (Japanese catalyst society system) 15 weight portions
This coating fluid is coated on the reflecting layer of the white polyester film that obtains in the reference example 1, making dried thickness is 5 μ m, 150 ℃ of following heated-air dryings 2 minutes, obtains coated film.
Though the brightness climbing of the coated film that obtains is 105%, the painted colour difference that causes is big, and the reduction of the brightness after the endurancing is also obvious, though be film, is difficult to practicality.Evaluation result is shown in table 1.
Comparative example 2 (example of white polyester film)
Change the fluorescent material shown in the table 1 into organic optical brightener UVITEX-OB (Ciba corporate system), making its addition is 5 weight portions, in addition obtains coated film similarly to Example 1.The brightness climbing of this moment is about 100%, does not confirm brightness and improves.This film is that the brightness after the big and endurancing of the painted colour difference that causes reduces big film, is difficult to practicality.Evaluation result is shown in table 1.
Comparative example 3 (example of white polyester film)
Change the addition of organic optical brightener OB-1 into 30 weight portions, in addition, similarly obtain coated film with comparative example 1.Evaluation result is shown in table 1.
Embodiment 6 (example of transparent polyester film)
In butyl acetate, making solid component concentration is the coating fluid of 45 weight % with following composition dissolves.
(coating fluid solid constituent composition)
Inorganic phosphor (2210 change into Optronix society system) 10 weight portions
Acrylic acid pearl (MBX-15 ponding changes into the industrial society of product system) 60 weight portions
Acryloid cement (UW S2740 Japan catalyst society system) 25 weight portions
Crosslinking agent (CORONATE HL Japanese polyurethane industry society system) 5 weight portions
As coating fluid, be coated with this coating fluid, make it after curing, be 8g/m 2, in addition, obtain coated film similarly to Example 1.Evaluation result is shown in table 1.
In addition, green emitting inorganic phosphor 2210 (changing into Optronix society system) be parent with ZnS, be the inorganic phosphor of activating substance with Cu.MBX-15 is that average grain diameter is the acrylic particles of 15 μ m.
This coating fluid is coated on the transparent polyester film that obtains in the reference example 2, and making dried thickness is 5 μ m, 150 ℃ of following heated-air dryings 2 minutes, obtains coated film.Evaluation result is shown in table 1.
Comparative example 4 (example of transparent polyester film)
In butyl acetate, making solid component concentration is the coating fluid of 45 weight % with following composition dissolves.
(coating fluid solid constituent composition)
Acrylic acid pearl (MBX-15 ponding changes into the industrial society of product system) 60 weight portions
Acryloid cement (UW S2740 Japan catalyst society system) 32 weight portions
Crosslinking agent (CORONATE HL Japanese polyurethane industry society system) 8 weight portions
As coating fluid, be coated with this coating fluid, make it after curing, be 8g/m 2, in addition, obtain coated film similarly to Example 6.Evaluation result is shown in table 1.
Table 1
The kind of fluorophor The fluorophor content (weight %) of coating layer Excitation wavelength 400～450nm's is luminous Glow peak wavelength (nm) Through the time xanthochromia Brightness raising rate (%) Colour difference Brightness sustainment rate (%) in the endurancing Colourity in the endurancing changes
Embodiment 1 Inorganic phosphor 2210 ??30 ??◎ ??535 ??◎ ??104.0 ??○ ??99.6 ??◎
Embodiment 2 Inorganic phosphor D1110 ??40 ??◎ ??650 ??◎ ??101.8 ??◎ ??99.5 ??○
Embodiment 3 Inorganic phosphor D1230 ??40 ??◎ ??440 ??◎ ??101.1 ??◎ ??99.5 ??◎
Embodiment 4 Inorganic phosphor KX732A ??30 ??◎ ??510 ??◎ ??101.2 ??◎ ??99.5 ??◎
Embodiment 5 Inorganic phosphor 2210 ??30 ??◎ ??535 ??○ ??104.0 ??○ ??96.4 ??○
The kind of fluorophor The fluorophor content (weight %) of coating layer Excitation wavelength 400～450nm's is luminous Glow peak wavelength (nm) Through the time xanthochromia Brightness raising rate (%) Colour difference Brightness sustainment rate (%) in the endurancing Colourity in the endurancing changes
Comparative example 1 Organic fluorescent OB-1 ??5 ??◎ ??550 ??× ??105.2 ??× ??94.3 ??×
Comparative example 2 Organic fluorescent UVITEX-OB ??5 ??◎ ??440 ??× ??100.0 ??○ ??95.2 ??×
Comparative example 3 Organic fluorescent OB-1 ??30 ??◎ ??550 ??× ??108.2 ??× ??94.2 ??×
Embodiment 6 Inorganic phosphor 2210 ??10 ??◎ ??535 ??○ ??103.8 ??○ ??99.1 ??○
Comparative example 4 ??--- ??0 ??× ??--- ??○ ??100.0 ??◎ ??99.0 ??○
The invention effect
According to the present invention, can provide suppressed through the time xanthochromia stack membrane, in addition, the member that can be provided as the back light unit of liquid crystal indicator can obtain the stack membrane of high brightness when using. According to the present invention, can provide through the time xanthochromia suppressed, can obtain the stack membrane that high brightness, colour cast are few, be suitable as reflecting plate.
Utilizability on the industry
Stack membrane of the present invention can be widely used in the optical applications, for example can be suitable as the reflecting plate of the back light unit of the member of the back light unit of liquid crystal indicator, particularly liquid crystal indicator.

Claims (3)

1. a stack membrane is to comprise the stack membrane that polyester film reaches the coating layer that contains fluorophor that is provided with thereon, it is characterized in that the fluorophor of coating layer comprises inorganic substances, and the content of this fluorophor in coating layer is 5～80 weight %.
2. stack membrane as claimed in claim 1, wherein, described stack membrane is used as the back light unit member of liquid crystal indicator.
3. stack membrane as claimed in claim 1, wherein, polyester film is a white polyester film, is used as the reflecting plate of the back light unit of liquid crystal indicator.
CN200880115237A 2007-11-08 2008-11-05 Multilayer film Pending CN101855081A (en)

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