CN101470214A - Glare-proof film, glare-proof polarizing sheet and image display device - Google Patents

Glare-proof film, glare-proof polarizing sheet and image display device Download PDF

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Publication number
CN101470214A
CN101470214A CNA200810184941XA CN200810184941A CN101470214A CN 101470214 A CN101470214 A CN 101470214A CN A200810184941X A CNA200810184941X A CN A200810184941XA CN 200810184941 A CN200810184941 A CN 200810184941A CN 101470214 A CN101470214 A CN 101470214A
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film
antiglare
antiglare film
polyethylene terephthalate
mist degree
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Chinese (zh)
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古谷勉
矢可部公彦
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • 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
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133502—Antiglare, refractive index matching layers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides an antiglare film, an antiglare polarizing disc and an image display device. The aim of the invention is to provide poly(ethylene terephthalate) film which has excellent mechanical strength of film and low cost and provide the antiglare film representing excellent antiglare performance. The antiglare film according to the invention is formed with an antiglare layer on the poly(ethylene terephthalate) film, wherein the antiglare layer is provided with superfine concave-convex shape on the surface. When the total haze is set to H% and the transmission definition is set to Tc%, the following relationship (1) is satisfied: Tc</= 8H...(1).

Description

Antiglare film, anti-dazzle polarizer and image display device
Technical field
The present invention relates to use anti-dazzle (antiglare) film of the polyethylene terephthalate film of excellence aspect the physical strength of film and cost and anti-dazzle polarizer and the image display device that uses this antiglare film.
Background technology
(cathode-ray tube (CRT): CRT) image display device such as display, organic electroluminescent (EL) display, when optical projection was to its display surface outside, observability can be subjected to remarkable infringement for LCD or plasma display device, Brown tube.All the time, in order to prevent so outer optical projection, at the video camera and the digital camera of the televisor of paying attention to image quality and PC, the strong outdoor application of light intensity outside, utilize in the mobile phone that reflected light shows etc., the rete of optical projection outside preventing is set on the surface of image display device.In this rete, usually use: utilize the no reflection events treatment technology of the interference that causes by optical multilayer or by forming the fine concavo-convex non-glare treated technology that makes the incident light scattering come the fuzzy projection image from the teeth outwards.Particularly the latter owing to can make less expensively, therefore is widely used in purposes such as large-scale watch-dog or PC by forming the fine concavo-convex technology that makes the incident light scattering.
Implement the antiglare film of such non-glare treated technology, wait by the following method to obtain all the time, for example, will disperse Packed resin solution to be coated on the substrate sheets, make the coated film surface expose filler by regulating coating film thickness, thereby on substrate sheets, form random concavo-convex method etc.
But, passing through like this makes the antiglare film that fillers dispersed makes, and there are the following problems, that is: because according to the disperse state of the filler in the resin solution or coating state etc., concavo-convex configuration or shape produce difference, therefore, what be difficult to obtain expecting is concavo-convex, can't obtain sufficient anti-dazzle performance in the low film of mist degree.In addition, when so existing antiglare film is configured in image display device surperficial, also exist display surface integral body to turn white, take place easily to show the problem of fuzzy so-called speck (white Chi や け) because of scattered light.
On the other hand, also just fine concavo-convexly manifest anti-dazzle property by what be formed at the transparent resin laminar surface attempting not making it contain filler.For example, a kind of antiglare film is disclosed in the TOHKEMY 2002-189106 communique (patent documentation 1, claim 1～6, paragraph 0043～0046), it has in clamping between embossing mold and the transparent resin film makes this ionizing ray curable resin solidify under the state of ionizing ray curable resin, form three-dimensional 10 mean roughness, and the three-dimensional roughness reference field on adjacent protuberance between mean distance satisfy the fine concavo-convex of setting respectively, the solidfied material layer of the ionizing ray curable resin layer of this concave-convex surface is arranged at transparent resin film upper strata pressing element thus.In addition, as the dissimilar embossing that is used to obtain such antiglare film, can also list as disclosed embossing in the TOHKEMY 2006-053371 communique (patent documentation 3) etc.
Recently, in image display device, liquid crystal indicator enlarges rapidly as the purposes of slim display frames such as LCD TV, monitoring lcd device, PC.Particularly the market of LCD TV significantly enlarges, and in addition, the requirement that reduces cost is also very strong.Polaroid as liquid crystal display television by using, at present normally usedly be on the polarizing coating that constitutes by polyvinyl alcohol resin film two-sided, to use aqueous adhesive to come to attach the polaroid that phase retardation film forms by bonding agent on lamination tri acetyl cellulose membrane (TAC film) and the single face at this polaroid.At this moment,, carry out surface treatment mostly, most antiglare film of having implemented above-mentioned non-glare treated technology of using in LCD TV in order to give functional for the TAC film of the most surperficial polaroid of the visible side that becomes liquid crystal indicator.As the phase retardation film that is laminated on the polaroid, usually use the stretch process product of polycarbonate resin film or the stretch process product of cycloolefin resin film etc., the inhomogeneous considerably less phase retardation film that constitutes by cycloolefin resin film of most uses phase differential at high temperature in the LCD TV purposes.
The Paste Product of the phase retardation film that constitutes for polaroid with by the stretching cycloolefin resin film in order to boost productivity and to reduce cost of products, is attempting reducing the number of packages or the simplified manufacturing technique of component parts.For example, following formation is disclosed in the Japanese kokai publication hei 08-043812 communique (with reference to patent documentation 2, particularly embodiment 4), promptly lamination TAC film on the single face of polarizing coating does not come lamination to have cycloolefin (norborene) resin molding of phase difference function by the TAC film in a side reverse with it.
In large-screen image display device purposes,, more and more obvious to the demand of the further slimming of image display device and lighting as for example wall hung television purposes etc.At this moment, the problem that exists for antiglare film, the anti-dazzle polarizer that uses this antiglare film, other component parts have following some.
(1) in order to adapt to the slim giant-screenization of image-displaying member, needs to strengthen the intensity of panel.
(2) in order to adapt to the slimming of image-displaying member, employed parts need slimming.
(3) gap turn narrow of the back light system at the liquid crystal panel and the back side in the liquid crystal indicator need prevent the spot or the Newton ring of the circle that caused with contacting of back light system by liquid crystal panel.
Summary of the invention
In order to solve above-mentioned problem, the stretching polyethylene terephthalate film of the physical strength of consideration use film and cost aspect excellence is as the base material film of antiglare film usually.But, be disposed at image display device at stretching polyethylene terephthalate film, when particularly liquid crystal indicator is watched image, because of the influence of its phase differential, exist during from oblique watching color spot (being also referred to as interference spot, rainbow spot) obviously, the problem of observability variation.
The present invention finishes in view of this present situation, its purpose is, the anti-dazzle polarizer and the image display device that a kind of anti-dazzle (antiglare) film are provided and use this antiglare film, wherein, described antiglare film, use the physical strength of film and the polyethylene terephthalate film of cost aspect excellence, and show excellent anti-dazzle performance.
The inventor etc. are in order to solve above-mentioned problem, repeated to concentrate on studies, found that, if the physical strength of use film and the polyethylene terephthalate film of cost aspect excellence are as the base material film of antiglare film, and the total mist degree H% and the transmission sharpness Tc% that form this antiglare film on this polyethylene terephthalate film satisfy the antiglare layer of particular kind of relationship, even then obtain the thin antiglare film that does not also observe color spot when also possessing sufficient mechanical and being disposed at image display device.
Promptly, antiglare film of the present invention, it is characterized in that forming the antiglare layer that has fine concaveconvex shape on the surface on the polyethylene terephthalate film, total mist degree of this antiglare film is set at H%, when the transmission sharpness is set at Tc%, satisfies following relational expression (1).
Tc≤8H …(1)
In antiglare film of the present invention, preferably total mist degree H% of this antiglare film and transmission sharpness Tc% satisfy following relational expression (2),
Tc≤5H …(2)
More preferably satisfy following relational expression (3),
Tc≤3H …(3)。
The polyethylene terephthalate film that uses in the antiglare film of the present invention is preferably uniaxial tension polyethylene terephthalate film or biaxial stretch-formed polyethylene terephthalate film, and preferably its thickness is more than the 20 μ m and below the 100 μ m.
Total mist degree of antiglare film of the present invention is made of surperficial mist degree and internal haze, and surperficial mist degree is more than 0.5% and below 15%, and internal haze is more than 5% and below 40%.
In addition, preferred in antiglare film of the present invention: from the reflectivity R (30) of 30 ° of the reflection angle of antiglare layer side during with 30 ° of incident lights of incident angle is more than 0.05% and below 2%, the reflectivity R (40) that reflection angle is 40 ° is more than 0.0001% and below 0.005%, and the reflectivity R (50) that reflection angle is 50 ° is more than 0.00001% and below 0.0005%.
Antiglare film of the present invention on the surface of the fine concaveconvex shape of antiglare layer, can also have low-reflection film.
In addition, according to the present invention, provide a kind of anti-dazzle polarizer, it is above-mentioned each described antiglare film and polarizing coating to be fitted form, and wherein, this polarizing coating is configured on antiglare film and the face face opposition side that forms antiglare layer.
Antiglare film of the present invention or anti-dazzle polarizer can make up with image-displaying members such as liquid crystal display cells or plasma display devices, make image display device.That is,, provide a kind of image display device according to the present invention, it possesses above-mentioned each described antiglare film or above-mentioned anti-dazzle polarizer and image-displaying member, antiglare film or anti-dazzle polarizer are the outside with its antiglare layer side, are configured in the visible side of image-displaying member.
Antiglare film of the present invention when reducing color spot and demonstrating excellent anti-dazzle performance, can prevent that also the observability that is caused by speck from descending.The anti-dazzle polarizer that such antiglare film of the present invention and polarizing coating (polarizer) are combined also demonstrates same effect.And, disposing the image display device of antiglare film of the present invention or anti-dazzle polarizer, its anti-dazzle performance height, observability excellence, and the strength-enhanced of panel can prevent the warpage of panel.In addition, improve that the phase differential had by the polyethylene terephthalate film causes from oblique watching the time color spot.
Description of drawings
Fig. 1 is the sectional schematic diagram of the preferred example of expression antiglare film of the present invention, and (a) the expression antiglare layer comprises the situation of filler, and (b) the expression antiglare layer does not comprise the situation of filler.
Fig. 2 is the figure of the relation of expression total mist degree H% of antiglare film and transmission sharpness Tc%.
Fig. 3 schematically represents to ask when calculating reflectivity from the incident direction of the light of antiglare layer side and the stereographic map of reflection direction.
Fig. 4 is an example of drawing with respect to the figure of the relation of the reflection of light reflection of light angle of the angle incident of 30 ° of the normals of distance antiglare film of the present invention and reflectivity (reflectivity is a logarithmic scale).
Symbol description
101a, 101b stretching polyethylene terephthalate film, 102a, 102b antiglare layer, 103a, 103b, 501 antiglare film, 104a filler, 502 normals, 505 incident lights, 506 normal reflection directions, 507 reflected light, 509 planes.
Embodiment
＜antiglare film 〉
Constituting of antiglare film of the present invention: on the polyethylene terephthalate film, be formed with the antiglare layer that has fine concaveconvex shape on the surface.Fig. 1 (a) reaches the sectional schematic diagram of the preference that (b) is expression antiglare film of the present invention.Antiglare film 103a shown in Fig. 1 (a) possesses and has: polyethylene terephthalate film 101a and have the antiglare layer 102a of fine concaveconvex shape on the surface of lamination on the surface of polyethylene terephthalate film 101a.Be dispersed with the filler 104a that is used to form the concave-convex surface shape in the antiglare layer.Antiglare film 103b shown in Fig. 1 (b) possesses and has: polyethylene terephthalate film 101b and have the antiglare layer 102b of fine concaveconvex shape on the surface of lamination on the polyethylene terephthalate film 101b surface.Antiglare layer 102a, 102b owing to be the antiglare layer of giving hard tunicle by curing, therefore are also referred to as hard conating sometimes.Antiglare film of the present invention also can utilize the filler that is dispersed in the antiglare layer to form the concave-convex surface shape shown in Fig. 1 (a), perhaps also can be shown in as Fig. 1 (b) not disperse filler in the antiglare layer, wait by for example embossing and form the concave-convex surface shape.Need to prove, in Fig. 1 (a) and (b), antiglare layer only forms on a face of polyethylene terephthalate film, but it only is the mode that only forms antiglare layer as mentioned above on a face that the present invention is not limited to, and also is included in the table of polyethylene terephthalate film the mode that forms antiglare layer on two faces.Below, polyethylene terephthalate film and antiglare layer are at length described, but the mode that forms on a face of polyethylene terephthalate film with antiglare layer in principle is main describing.
＜polyethylene terephthalate film 〉
Antiglare film of the present invention has the antiglare layer of fine concaveconvex shape to make at any one face or its two-sided upper strata pressing element of polyethylene terephthalate film.Preferred this polyethylene terephthalate film carries out uniaxial tension or biaxial stretch-formed (following also will carry out uniaxial tension as mentioned above or the biaxial stretch-formed polyethylene terephthalate film that forms simply is designated as " stretching polyethylene terephthalate film ").Stretching polyethylene terephthalate film is an excellent film such as engineering properties, solvent resistance, mar resistance, cost, uses the antiglare film of such polyethylene terephthalate film, in excellences such as physical strength, can attempt to reduce thickness.
At this, in the present invention, constitute the polyethylene terephthalate of polyethylene terephthalate film, be meant the above resin that constitutes by ethylene glycol terephthalate of 80 moles of % of repetitive, also can comprise formation unit from other copolymer composition.As other copolymer composition, can list: m-phthalic acid, beta-hydroxy ethoxybenzoic acid, 4,4 '-dicarboxylate biphenyl, 4,4 '-benzophenonedicarboxylic acid, two (4-carboxyl phenyl) ethane, hexane diacid, decanedioic acid, 5-sodium sulfo isophthalate, 1, the 4-cyclohexyl dicarboxylic acid waits the dicarboxylic acid composition; Diol components such as the ethylene oxide adduct of propylene glycol, butylene glycol, neopentyl glycol, diethylene glycol, cyclohexane diol, bisphenol-A, polyglycol, polypropylene glycol, polytetramethylene glycol.These dicarboxylic acid compositions or diol component can make up two or more uses as required.In addition, with above-mentioned carboxylic acid composition or diol component also can and with hydroxycarboxylic acids such as P-hydroxybenzoic acid.As other copolymer composition, also can use dicarboxylic acid composition and/or the diol component that contains a spot of amido link, ammonia ester bond, ehter bond, carbonic acid ester bond etc.That is, in the present invention, even when comprising other such copolymer composition, also be designated as polyethylene terephthalate.
Manufacture method as polyethylene terephthalate, can adopt manufacture method arbitrarily such as direct polymerization, ester exchange reaction method, so-called directly polymerization, be to instigate the directly method of reaction of terephthalic acid (TPA) and ethylene glycol (and other dicarboxylic acid and/or other glycol) as required, so-called ester exchange reaction method is to instigate the dimethyl ester of terephthalic acid (TPA) and ethylene glycol (and the dimethyl ester of other dicarboxylic acid and/or other glycol) as required to carry out the method for ester exchange reaction.In addition, polyethylene terephthalate also can contain known adjuvant as required.As known adjuvant, for example can list: lubricant, anti blocking agent, thermal stabilizer, antioxidant, antistatic agent, photostabilizer, resistance to impact modifying agent etc.Wherein, owing to require the transparency as the base material film of antiglare film, therefore preferred addition with adjuvant is limited in Min..
To be configured as membranaceously with the material resin of aforesaid manufacture method manufacturing, and and implement uniaxial tension and handle or biaxial stretch-formed processing, can make the polyethylene terephthalate film that stretches and form thus.By carrying out stretch processing, can obtain the high polyethylene terephthalate film of physical strength.The method for making of the polyethylene terephthalate film that stretching forms is arbitrarily, be not particularly limited, can list following method: for example with regard to uniaxial tension polyethylene terephthalate film, with fusion above-mentioned raw materials resin and extrusion molding is the no alignment films of sheet, after carrying out cross directional stretch with stenter under the temperature more than the glass transition temperature, implement heat fixation and handle.In addition, with regard to biaxial stretch-formed polyethylene terephthalate film, can list following method: with fusion above-mentioned raw materials resin and extrusion molding is the no alignment films of sheet, after carrying out longitudinal stretching with stenter under the temperature more than the glass transition temperature, the enforcement heat fixation is handled, then carry out cross directional stretch, implement heat fixation then and handle.At this moment, draft temperature is 80～130 ℃, is preferably 90～120 ℃ that stretching ratio is 2.5～6 times, is preferably 3～5.5 times.When stretching ratio is low, might not show the sufficient transparency by the polyethylene terephthalate film.
In addition, in order to reduce the distortion of orientation main shaft, preferably carrying out before the heat fixation processing polyethylene terephthalate film being carried out relaxation processes after the stretching.Temperature during relaxation processes is 90～200 ℃, is preferably 120～180 ℃.Slack is different because of stretching condition, but the temperature when preferably setting slack and relaxation processes, and making the percent thermal shrinkage of polyethylene terephthalate film under 150 ℃ after the relaxation processes is below 2%.
The heat fixation treatment temperature can be set at 180～250 ℃, be preferably 200～245 ℃.In heat fixation is handled, at first carry out after heat fixation handles with fixed length, for the distortion that reduces the orientation main shaft and improve the intensity of thermotolerance etc., preferably further carry out the relaxation processes of Width.The preferred slack of regulating this moment makes the percent thermal shrinkage of polyethylene terephthalate film under 150 ℃ after the relaxation processes reach 1～10%, more preferably reach 2～5%.Among the present invention the maximal value of the distortion of the orientation main shaft of employed stretching polyethylene terephthalate film be 10 degree following, be preferably 8 degree following, more preferably below 5 degree.If the maximal value of the distortion of orientation main shaft is spent greater than 10, when then on LCD Panel, fitting, might painted bad increasing.Need to prove that " maximal value of the distortion of orientation main shaft " of stretching polyethylene terephthalate film can be measured by the phase retardation film testing fixture RETS system that for example Otsuka Electronics Co., Ltd. makes.
The thickness d of such stretching polyethylene terephthalate film PETIt is above and 100 μ m following, more preferably 30 μ m are above and below the 50 μ m to be preferably set to 20 μ m.Thickness d when stretching polyethylene terephthalate film PETWhen being lower than 20 μ m, might be difficult to dispose, work as thickness d PETWhen surpassing 100 μ m, might weaken the advantage of thin-walled property.In addition, phase difference value R in the face of stretching polyethylene terephthalate film PETBe preferably more than the 1000nm, more preferably more than the 3000nm.Interior face to face phase difference value R PETWhen being lower than 1000nm, might make from the front painted significantly.Need to prove phase difference value R in the face of stretching polyethylene terephthalate film PETRepresent with following formula (4).
R PET＝(n a-n b)×d PET (4)
At this, n aBe the refractive index of slow-axis direction in the face of stretching polyethylene terephthalate film, n bRefractive index for quick shaft direction in the face (direction that intersects vertically with slow-axis direction in the face).
Also can give mist degree to stretching polyethylene terephthalate film.Method as giving mist degree is not particularly limited, and for example, can use in the above-mentioned raw materials resin method of mixing inorganic particles or organic fine particles etc.As inorganic particles, can enumerate inorganic particles such as lime carbonate, barium sulphate, titanium dioxide, aluminium hydroxide, silicon dioxide, glass, talcum, mica, white carbon black, magnesium oxide, zinc paste and these inorganic particles be implemented inorganic particles that surface treatments form etc. as representational material with fatty acid etc.In addition, as organic fine particles, can use melamine particle (refractive index 1.57), polymethylmethacrylate particle (refractive index 1.49), methyl methacrylate/styrene copolymer resin particle (refractive index 1.50～1.59), polycarbonate particle (refractive index 1.55), polyethylene particles (refractive index 1.53), particulate polyvinyl chloride (refractive index 1.46), silicone resin particle resin particles such as (refractive indexes 1.46).
Can also be to a face or the various easy gluing processing of two-sided enforcement of stretching polyethylene terephthalate film.The gluing processing of commute is not particularly limited, and can enumerate present known processing, for example corona treatment, Cement Composite Treated by Plasma, flame treatment, prime treatment, solvent processing etc.
More than to using uniaxial tension or biaxial stretch-formed polyethylene terephthalate film to describe as the situation of the base material film of antiglare film, but also can use the stretching poly (ethylene naphthalate) film polyethylene terephthalate film that replaces stretching, also can obtain in this case and above-mentioned same effect.
＜antiglare layer and total mist degree/transmission sharpness 〉
Form on the antiglare film of the present invention, have the antiglare layer of fine concaveconvex shape on the surface, be laminated on the surface of above-mentioned polyethylene terephthalate film (preferably its drawn products), satisfy above-mentioned relation formula (1) as the total mist degree H% and the transmission sharpness Tc% of antiglare film.Do not satisfy under the situation of relational expression (1), when being configured in this antiglare film on the image display device, observe the color spot that causes by the phase differential of stretching polyethylene terephthalate film.In addition, in order to suppress this color spot better, the total mist degree H% and the transmission sharpness Tc% of preferred antiglare film satisfy above-mentioned relation formula (2) and more preferably satisfy above-mentioned relation formula (3).
For antiglare film of the present invention, consider that from the viewpoint that suppresses color spot the lower limit of above-mentioned transmission sharpness is not particularly limited, but consider from the viewpoint of the observability of liquid crystal indicator, be preferably more than 30%.Need to prove, known to the transmission sharpness that makes antiglare film descends, so that it satisfies relational expression of the present invention (1)～(3), for example, as long as increase the cycle of concave-convex surface shape.
At this, the as described below mensuration of total mist degree H% of antiglare film.Promptly, form on as the polyethylene terephthalate film of base material film and have the antiglare layer of fine concaveconvex shape, make the one side that does not form this antiglare layer become the composition surface, use clear binder that this antiglare film and glass substrate are fitted, measure total mist degree according to JIS K 7136.
In addition, the as described below mensuration of transmission sharpness Tc% of antiglare film of the present invention.Promptly, form on as the polyethylene terephthalate film of base material film and have the antiglare layer of fine concaveconvex shape, make the one side that does not form this antiglare layer become the composition surface, use clear binder that this antiglare film and glass substrate are fitted, measure with the method for JIS K 7105 regulations.In this specification, as measuring the employed light comb of image definition, it is that 1:1 and its width are 0.125mm, 0.5mm, 1.0mm and 2.0mm four types that regulation has the width ratio of dark portion and highlights.In the antiglare film of the present invention's regulation, the image definition sum of using these four types of light combs and measuring is called the transmission sharpness.The maximal value of the transmission sharpness during according to this definition is 400%.
Fig. 2 is the figure of the relation of expression total mist degree H% of antiglare film and transmission sharpness Tc%, and it is used to estimate the color spot degree in the time of will using uniaxial tension polyethylene terephthalate film to be configured on the image display device as the antiglare film of base material film.As shown in Figure 2, when total mist degree H% of antiglare film and transmission sharpness Tc% do not satisfy relational expression (1) (in the zone of the upside of straight line Tc=8H (Tc〉8H)), it is serious to observe color spot.In order to suppress color spot better, preferably satisfy relational expression (2), more preferably satisfy relational expression (3) (promptly at the downside of straight line Tc=3H (Tc≤3H) zone).
Need to prove, estimate color spot according to following steps.At first, peel off the polaroid of rear side and display surface side from commercially available LCD TV (" LC-32GH3 " that Sharp Corporation makes), replace these original polaroids, pass through bonding agent, the polaroid " ス ミ カ ラ Application SRD341E " made of side applying Sumitomo Chemical Co overleaf, at the display surface side TAC film " Off ジ Star Network " that lamination successively has Fuji Photo Film Co., Ltd. to make of fitting, the polyvinyl alcohol polarizer (polarizing coating) and the polaroid that demonstrates the antiglare film (antiglare film of the present invention and antiglare film as a comparative example) of various total mist degree H% and transmission sharpness Tc% make each absorption axes consistent with the absorption axes of original polaroid.Then, in the darkroom, open the LCD TV obtain thus, under white show state from frontal and oblique visual observations and estimate the degree (evaluation is 3 observers' a mean value) of color spot.Estimate the degree of color spot, drafting pattern 2 according to following standard with 5 grades of 1～5.
1: do not observe color spot fully.2: almost do not observe color spot.3: observe color spot slightly.
4: obviously observe color spot.5: it is serious to observe color spot.
Method for making as having the antiglare layer of fine concaveconvex shape on the surface of satisfying above-mentioned optical characteristics is not particularly limited, and can use known method in the past.For example can enumerate: will disperse Packed resin solution to be coated on the resin base material film, and make the coated film surface expose filler by regulating coating film thickness, thereby form random concavo-convex method; Disclosed embossing etc. in the above-mentioned patent documentation 3.And, in any method of these methods,, make its increase by regulating the cycle of surperficial micro concavo-convex shape, can realize the relation of above-mentioned relation formula (1)～(3).At this moment, for the cycle of the micro concavo-convex shape on surface, for example, count more than the 20 μ m and below the 100 μ m with the average length PSm in the sectional curve of concaveconvex shape.Need to prove, under normal conditions, by the thickness of the particle diameter that increases filler, the content that reduces filler and increase antiglare layer, the cycle that can increase fine concaveconvex shape.
At this, the fine concaveconvex shape that has on the surface of antiglare layer of the present invention, be meant that in the sectional curve of this concaveconvex shape preferred arithmetic mean height Pa is that 0.05 μ m is above and 0.3 μ m is following, maximum profile height Pt is more than the 0.2 μ m and below the 2 μ m.When arithmetic mean height Pa is lower than 0.05 μ m,, therefore not preferred owing to the sufficient anti-dazzle property that can't show as antiglare film.In addition, when arithmetic mean height Pa surpassed 0.3 μ m, the surperficial mist degree of possible antiglare film increased, and can produce speck when being applied to image display device, and observability sustains damage.When maximum profile height Pt is lower than 0.2 μ m, same not preferred owing to when making antiglare film, can't show sufficient anti-dazzle property.In addition, when maximum profile height Pt surpassed 2 μ m, the surperficial mist degree of antiglare film increased, and can produce speck in the time of may being applied to image display device, and observability sustains damage.
Method for making as such antiglare layer, by will disperse Packed resin solution to be coated on to form antiglare layer on the polyethylene terephthalate film as the resin base material film time, as filler, then be not particularly limited as long as have light transmission, can use present known particle.For example, as inorganic particles, can enumerate inorganic particulate such as lime carbonate, barium sulphate, titanium dioxide, aluminium hydroxide, silicon dioxide, glass, talcum, mica, white carbon black, magnesium oxide, zinc paste and these inorganic particulates be implemented inorganic particulate that surface treatments form as representational material with fatty acid etc.In addition, as organic fine particles, can enumerate melamine particle (refractive index 1.57), polymethylmethacrylate particle (refractive index 1.49), methyl methacrylate/styrene copolymer resin particle (refractive index 1.50～1.59), polycarbonate particle (refractive index 1.55), polyethylene particles (refractive index 1.53), particulate polyvinyl chloride (refractive index 1.46), silicone resin particle resin particles such as (refractive indexes 1.46) as representational material.
At this,, in above-mentioned filler, preferably use silica-based fine particles (porous silica, cohesion silicon dioxide, spherical silicon dioxide etc.) or resin particle in order to satisfy the above-mentioned relation formula of total mist degree H% of the present invention and transmission sharpness Tc%.Use silica-based fine particles when forming the filler of antiglare layer, the preferred weight mean grain size is that 1 μ m is above and below the 5 μ m, relative translucent resin 100 weight portions of the content in antiglare layer are more than 1 weight portion and in the scope below 10 weight portions.
Weight average particle diameter is 1 μ m when following, might can't show sufficient anti-dazzle property, is 5 μ m when above, and surperficial mist degree increases, and the result might make antiglare film produce speck, and observability descends.In addition, when the addition of silica-based fine particles is 1 weight portion when following, might can't show sufficient anti-dazzle property, perhaps thinning thin, the texture decline of concave-convex surface, when above above 10 weight portions, surperficial mist degree increases, the result might make antiglare film produce speck, and observability descends.In addition, can suitably regulate the thickness of antiglare layer, with the surperficial mist degree that needing to obtain, generally, preferably be more than 85%, more preferably more than 100% for weight average particle diameter.When the thickness of antiglare layer be lower than particle weight average particle diameter 85% the time, surperficial mist degree increases, the result might make antiglare film produce speck, observability descends.On the other hand, the upper limit of the thickness of the antiglare layer of this moment is considered from the viewpoint of surperficial mist degree, be not particularly limited, but it might break when blocked up easily, perhaps film curls, throughput rate descends because of the cure shrinkage of antiglare layer causes, and therefore, is preferably below the 20 μ m.
Use resin particle when forming the filler (light transmission particulate) of antiglare layer, the preferred weight mean grain size is that 2 μ m are above and below the 10 μ m, and the content in antiglare layer is with respect to translucent resin 100 weight portions more than 1 weight portion and in the scope below 40 weight portions.Weight average particle diameter is 2 μ m when following, might can't show sufficient anti-dazzle property, and when surpassing 10 μ m, surperficial mist degree increases, and the result might make antiglare film produce speck, and observability descends.In addition, when addition less than 1 weight portion of resin particle, might can't show sufficient anti-dazzle property, or thinning thin, the texture decline of concave-convex surface, when surpassing 40 weight portions, total mist degree (surperficial mist degree and internal haze sum) increases, when the result is applicable to image display device, might make the screen deepening, observability sustains damage.In addition, can suitably regulate the thickness of antiglare layer, with the surperficial mist degree that needing to obtain, generally, be more than 85%, more preferably more than 100% with respect to weight average particle diameter preferably.When the thickness of antiglare layer be lower than particle weight average particle diameter 85% the time, surperficial mist degree increases, the result might make antiglare film produce speck, observability descends.On the other hand, the upper limit of thickness of the antiglare layer of this moment is considered from the viewpoint of surperficial mist degree, be not particularly limited, but it may break when blocked up easily, or film curls, throughput rate descends because of the cure shrinkage of antiglare layer causes, and therefore, is preferably below the 20 μ m.
As the resin that is dispersed with above-mentioned filler, can use uv curing resin, heat-curing resin, electronic beam curing resin etc., but consider from viewpoints such as throughput rate, hardness, preferably use uv curing resin.As uv curing resin, can use commercially available resin.For example, the potpourri of the independent or two or more of polyfunctional acrylic esters such as trimethylolpropane triacrylate, tetramethylol methane tetraacrylate and " Irgacure 907 ", " Irgacure 184 " (above made by Ciba company), " Lucirin TPO " Photoepolymerizationinitiater initiaters such as (BASF AG's manufacturings) can be made uv curing resin.For example, when using uv curing resin, after fillers dispersed is in uv curing resin, this resin combination is coated on the resin base material film, irradiation ultraviolet radiation can form thus and disperse Packed antiglare layer in the resin (being also referred to as the hard conating resin).
In addition, disclosed like that as above-mentioned patent documentation 3 etc. when utilizing embossing to form to have the antiglare layer of fine concaveconvex shape, use the mould of the fine concaveconvex shape of formation, the shape transferred thereon of mould is got final product on the resin base material film.Mold shape is preferably undertaken by embossing to the transfer printing of film, as embossing, preferably uses the UV embossing of uv curing resin.
Need to prove, when making the mould of the fine concaveconvex shape of patent documentation 3 described formation, be attached to the size of the particulate of die surface, perhaps increase the thickness of electroless plating Ni, the cycle that can increase fine concaveconvex shape by increase.
In the UV embossing, on the surface of polyethylene terephthalate film (resin base material film), form the uv curing resin layer, by with this uv curing resin layer by on the male and fomale(M﹠F) that is pressed in mould, it is solidified, and the male and fomale(M﹠F) of mould is transferred on the uv curing resin layer.Particularly, on the resin base material film, be coated with uv curing resin, under the state of the male and fomale(M﹠F) driving fit of uv curing resin after making coating and mould, from resin base material film side irradiation ultraviolet radiation uv curing resin is solidified, then, the polyethylene terephthalate film of the uv curing resin layer after form solidifying is peeled off from mould, thus with the shape transferred thereon of mould to uv curing resin.The kind of uv curing resin is not particularly limited.In addition, by suitable selective light initiating agent, also can use and to replace uv curing resin by the visible-light curing resin that is cured than the long visible light of ultraviolet ripple.
When using the UV embossing to form antiglare layer, also can make fillers dispersed in resin (being also referred to as the hard conating resin) in order to give internal haze.In order to give internal haze, preferably use such resin resin particle different with refractive index, can from above-mentioned resin particle, select to use.For the resin particle of this moment, the preferred weight mean grain size is that 2 μ m are above and below the 10 μ m, and the content in antiglare layer is with respect to translucent resin 100 weight portions more than 1 weight portion and in the scope below 40 weight portions.When weight average particle diameter was less than 2 μ m, the wide-angle scattering of transmitted light increased, and may cause that antiglare film integral body is turned white, contrast descends, and when surpassing 10 μ m, might can't obtain the scattering-in of necessity.In addition, when the addition of resin particle is less than 1 weight portion, might can't obtain sufficient scattering-in, when surpassing 40 weight portions, it is excessive that scattering-in becomes, and when the result is applied to image display device, might make the screen deepening, and observability sustains damage.
Utilize the thickness of the antiglare layer of such UV embossing formation to be not particularly limited, be preferably more than the 2 μ m and below the 20 μ m.When the thickness of antiglare layer is lower than 2 μ m, might can't obtain full intensity, damage easily, in addition, when its thickness surpasses 20 μ m, might break easily, or film curls, throughput rate descends because of the cure shrinkage of antiglare layer causes.
In addition, total mist degree of antiglare film of the present invention is made up of surperficial mist degree and internal haze, and this surface mist degree is preferably more than 0.5% and below 15%, and this internal haze is preferably more than 5% and below 40%.At this, the surperficial mist degree of antiglare film and internal haze is as described below measures.Promptly, at first, after polyethylene terephthalate film (preferred drawn products) is gone up the formation antiglare layer, be the mode on composition surface with a side that does not form antiglare layer, use clear binder fit this antiglare film and glass substrate, measure mist degrees according to JIS K 7136.The mist degree of Ce Dinging is equivalent to total mist degree (H%) of antiglare film thus.Then, on the surface of the fine concaveconvex shape of antiglare layer, use glycerine applying mist degree to be essentially 0 tri acetyl cellulose film, measure mist degree according to JIS K7136 once more.For this mist degree, eliminate by the tri acetyl cellulose film that is fitted on this concave-convex surface basically by the surperficial mist degree that this fine concaveconvex shape causes, therefore can be considered as " internal haze " of antiglare film.Thereby " the surperficial mist degree " of antiglare film tries to achieve according to following formula (5).
Surface mist degree=total mist degree-internal haze ... (5)
Consider that from the viewpoint that suppresses speck the surperficial mist degree of antiglare film is set at below 15%, in order more effectively to suppress speck, is preferably below 5%.Wherein, be lower than at 0.5% o'clock and can't show sufficient anti-dazzle property, therefore not preferred.In addition, when the internal haze of antiglare film surpassed 40%, when being applied to image display device, its result might make the screen deepening, and observability is impaired.In addition, internal haze is lower than at 5% o'clock, when being disposed at high meticulous image display device, might produce Luminance Distribution (dazzle) owing to the interference of pixel and concave-convex surface.The preferred scope of internal haze is more than 10% and below 20%.
In addition, for antiglare film of the present invention, from the antiglare layer side during with 30 ° of incident lights of incident angle, the reflectivity R (30) that preferred reflection angle is 30 ° be 0.05% or more and the reflectivity R (40) of 40 ° of 2% following, reflection angle be more than 0.0001% and 0.005% below, the reflectivity R (50) of 50 ° of reflection angle is more than 0.00001% and below 0.0005%.The antiglare film that demonstrate excellent anti-dazzle performance by reflectivity R (30), reflectivity R (40), reflectivity R (50) being set in the above-mentioned scope, can providing, suppresses speck simultaneously more effectively.
At this, the reflectivity from above-mentioned each angle of antiglare layer side during with 30 ° of incident lights of incident angle is described.Fig. 3 be schematically represent to ask when calculating reflectivity with respect to antiglare film from the incident direction of the light of antiglare layer side and the stereographic map of reflection direction.With reference to Fig. 3, in the antiglare layer side of antiglare film 501, with respect to being the light 505 of 30 ° angle incident with distance normal 502, will be to the direction of 30 ° of reflection angle, be that the catoptrical reflectivity (being the normal reflection rate) of normal reflection direction 506 is set at R (30).In addition, in light 507, the catoptrical reflectivity of the catoptrical reflectivity of θ=40 °, θ=50 ° is set at R (40), R (50) respectively with the reflection of reflection angle θ arbitrarily.Need to prove that the catoptrical direction when measuring reflectivity (normal reflection direction 506 and with the reflection direction of the light 507 of reflection angle θ reflection) is set in the plane 509 of the direction of the light 505 that comprises incident and normal 502.
When normal reflection rate R (30) surpasses 2%, might can't obtain sufficient anti-dazzle function, observability decline.On the other hand,, also demonstrate the tendency that produces speck, therefore be preferably more than 0.05% even normal reflection rate R (30) is too small.Normal reflection rate R (30) more preferably below 1.5%, particularly below 0.7%, more preferably be set at more than 0.1%, particularly more than 0.3%.In addition, when R (40) surpasses 0.005% or R (50) when surpassing 0.0005%, might make and produce speck on the antiglare film, observability descends.That is, for example, even the front surface of display device is provided with when display surface is for black the demonstration under the state of antiglare film, also might pick up from around light and cause display surface integral body to bleach, produce speck.Therefore, preferred R (40) and R (50) are not too big.On the other hand, even the reflectivity of these angles is too small, also can't show sufficient anti-dazzle property, therefore, R (40) is preferably more than 0.0001% usually, R (50) is preferably more than 0.00001% usually.R (40) is more preferably more than 0.0005% and 0.002% following, R (50) more preferably more than 0.00005% and below 0.0001%.
Fig. 4 be draw with respect to the antiglare layer side in antiglare film of the present invention (antiglare film 501 among Fig. 3) with distance normal 502 be 30 ° angle incident light 505, with the example of the figure that concerns between the reflection angle θ of the light 507 of reflection angle θ reflection and the reflectivity (reflectivity is a logarithmic scale).Sometimes the reflectivity of each reflection angle that reads with the figure of the relation of such expression reflection angle and reflectivity or by this figure is called reflectivity curve.As shown in the drawing, normal reflection rate R (30) is that angle departs from the normal reflection direction more, tends to reflectivity and descends more with respect to the peak value with the reflectivity of the light 505 of 30 ° of incidents.In the example of reflectivity curve shown in Figure 4, normal reflection rate R (30) is about 0.1%, R (40) is about 0.004%, R (50) is about 0.0005%.
When measuring the reflectivity of antiglare film, must accurately measure the reflectivity below 0.001%.Therefore, it is effective using the detecting device of wide dynamic range.As such detecting device, can use for example commercially available light power meter etc., the slit can be set before the detecting device of this light power meter, the goniophotometer that makes the angle of predicting antiglare film reach 2 ° is measured.As incident light, can use the visible light of 380～780nm, use light source as measuring, can use the light source of the parallel light that penetrates by light sources such as Halogen lamp LEDs, also can use by the high light source of the depth of parallelism of monochromatic sources such as laser.When inside being level and smooth and transparent antiglare film, because the reflection from the antiglare film the inside influences measured value sometimes, therefore, preferably, can only measure the most surperficial reflectivity of antiglare film thus by for example on the acrylic resin board of black, using bonding agent or liquid such as water and glycerine to make the even surface of antiglare film carry out the optics driving fit.
In view of the foregoing, predetermined reflection R (30), R (40) and as described below mensuration of R (50) among the present invention.On the antiglare layer surface (surface) of antiglare film with fine concaveconvex shape, from direction with respect to 30 ° of normal 502 inclinations, irradiation is from the directional light of He-Ne laser, the angle of the reflectivity in the plane 509 that comprises normal 502 and incident light 505 changed measure.In the mensuration of reflectivity, " 329203 optical power sensors (the Optical Power Sensor) " that all can use Yokogawa Electric Corporation to make reaches " 3292 light power meter ".
＜low-reflection film 〉
Antiglare film of the present invention also can be the most surperficial at it, be to have low-reflection film on the surface of fine concaveconvex shape of antiglare layer.Although,, can further improve anti-dazzle property by on the most surperficial, low-reflection film being set not having also to bring into play sufficient anti-dazzle function under the state of low-reflection film.By the layer of the low-index material lower than its refractive index is set, can form low-reflection film on antiglare layer.As such low-index material, specifically can list: make and contain lithium fluoride (LiF), magnesium fluoride (MgF in acrylic resin or epikote etc. 2), aluminum fluoride (AlF 3), cryolite (3NaFAlF 3Or Na 3AlF 5) wait the low reflecting material of mineral-type that particulate inorganic material forms; Organic low reflecting materials such as fluorine class or silicone organic compound, thermoplastic resin, heat-curing resin, uv curing resin.
The thickness of such low-reflection film is more than the 0.01 μ m and below the 0.2 μ m, more preferably more than the 0.08 μ m and below the 0.12 μ m.
＜anti-dazzle polarizer 〉
The anti-dazzle performance height of antiglare film of the present invention, the observability excellence, and can strengthen the intensity of panel, prevent the warpage of panel, therefore, and when on image display device, installing, observability and physical strength excellence.When image display device is LCD, this antiglare film can be applied to polaroid.That is, the common majority of polaroid is the form that is fitted with diaphragm on the single face at least of the polarizing coating that is had the polyvinyl alcohol resin film of iodine or dichroic dye to constitute by the absorption orientation, constitutes one of them diaphragm with antiglare film of the present invention.Applying polarizing coating and antiglare film of the present invention make being formed with on the face of face opposition side of antiglare layer with this antiglare film and dispose polarizing coating, can make anti-dazzle polarizer thus.At this moment, can the state of any layer of lamination not on another face of polarizing coating, also can other diaphragm of lamination or blooming, the perhaps adhesive phase that also can be formed on liquid crystal cells, fitting.In addition, on this diaphragm of the polaroid that is fitted with diaphragm on the single face at least of polarizing coating, with antiglare film of the present invention with the face side of the face opposition side that forms this antiglare layer on fit, also can make anti-dazzle polarizer thus.In addition; at least be fitted with in the polaroid of diaphragm on the single face; after will fitting on the polarizing coating as the above-mentioned stretching polyethylene terephthalate film of this diaphragm, on the polyethylene terephthalate film, form above-mentioned antiglare layer, also can make anti-dazzle polarizer thus.
For such anti-dazzle polarizer of the present invention, so long as on antiglare film and the face of face opposition side that is formed with antiglare layer, dispose polarizing coating, then comprise with polarizing coating and directly be connected the mode of fitting, also comprise the mode that polarizing coating and antiglare film are fitted by other film simultaneously with antiglare film.
＜image display device 〉
Image display device of the present invention possesses: antiglare film of the present invention or aforesaid anti-dazzle polarizer and image-displaying member.At this, image-displaying member, enclose liquid crystal cells that liquid crystal is arranged and change by applying state of orientation that voltage makes liquid crystal that to carry out the liquid crystal panel that image shows be representative to possess between upper and lower base plate, in addition, for known various displays such as plasma display device, CRT monitor, OLED display, also can adopt antiglare film of the present invention or aforesaid anti-dazzle polarizer.In image display device of the present invention, antiglare film or anti-dazzle polarizer serve as the visible side that the outside is disposed at image-displaying member with its antiglare layer side.At this moment, with the male and fomale(M﹠F) of antiglare film, be that the antiglare layer side is that the outside (visible side) is configured.Antiglare film can directly be fitted in the surface of image-displaying member,, as mentioned above, also can be fitted on the surface of liquid crystal panel by polarizing coating during as image display means with liquid crystal panel.Thus, have the image display device of antiglare film of the present invention, the concave-convex surface that can utilize antiglare film to have makes the incident light scattering, the fuzzy projection image, thus obtain excellent observability.
In addition, antiglare film of the present invention is applied to the situation of image display device, compares, can strengthen slab strength, prevent the panel warpage with the situation of using existing antiglare film.In addition, do not observe that the phase differential that had by stretching polyethylene terephthalate film causes yet from oblique the observation time color spot.
Embodiment
Below, illustrative embodiments is described more specifically the present invention, but the present invention is not limited to these examples.In the example, the % of expression content or use amount and part, short of special record is weight standard.In addition, the evaluation method of the antiglare film in the following Example is as described below.
(1) mensuration of the optical characteristics of antiglare film
(1-1) mist degree
Total mist degree of antiglare film, be to use optically transparent bonding agent that antiglare film is fitted on the glass substrate with the face with antiglare layer formation face opposition side, for the antiglare film that is fitted on this glass substrate, use is measured according to haze meter " HM-150 " type of dye technology research institute of Murakami K. K. manufacturing of JIS K 7136.In addition, internal haze is to use the glycerine mist degree of fitting to be essentially 0 tri acetyl cellulose film on the convex-concave surface of antiglare layer, measures according to JIS K 7136 once more.The surface mist degree calculates according to above-mentioned formula (5).
(1-2) transmission sharpness
Use is measured the transmission sharpness of antiglare film according to the image definition analyzer " ICM-1DP " of Suga testing machine Co., Ltd. manufacturing of JIS K 7105.At this moment, in order to prevent the warpage of sample, using optically transparent bonding agent, is that the mode on surface is fitted on the glass substrate with the micro concavo-convex shape face of antiglare layer, is used for then measuring.Under this state, make light from glass side incident, measure.Be to use the width of dark portion and highlights to be respectively the light comb of four types of 0.125mm, 0.5mm, 1.0mm and 2.0mm and the aggregate value of the value measured in this measured value.The maximal value of the transmission sharpness of this moment is 400%.
(1-3) reflectivity curve
On the micro concavo-convex shape face of the antiglare layer of antiglare film, from direction with respect to 30 ° of embrane method line inclinations, irradiation is measured the angle variation of the reflectivity in the plane that comprises embrane method line and direction of illumination (incident direction of light) from the directional light of He-Ne laser.In the mensuration of reflectivity, " 329203 optical power sensor " that all use Yokogawa Electric Corporation to make reaches " 3292 light power meter ".
(2) evaluation of the anti-dazzle performance of antiglare film
(2-1) evaluation of speck
In order to prevent reflection from antiglare film the inside (with the face of the micro concavo-convex shape face opposition side of antiglare layer), micro concavo-convex shape face with antiglare layer is the surface, antiglare film is fitted on the black acrylic resin board, opening the bright indoor of fluorescent light, carry out visual observations, the degree of visual assessment speck from the micro concavo-convex shape face side of antiglare layer.Estimate the degree (being evaluated as 3 observers' mean value) of speck with 3 grades of 1～3 according to following standard.
1: do not observe speck.2: observe speck slightly.3: obviously observe speck.
(2-2) evaluation of color spot
Estimate color spot according to following steps.At first, peel off the polaroid of rear side and display surface side from commercially available LCD TV (" LC-32GH3 " that Sharp Corporation makes), replace these original polaroids, pass through bonding agent, the polaroid " ス ミ カ ラ Application SRD341E " made of side applying Sumitomo Chemical Co overleaf, at the display surface side TAC film " Off ジ Star Network " that lamination successively has Fuji Photo Film Co., Ltd. to make of fitting, the polyvinyl alcohol (PVA) polarizer (by containing the polarizing coating that the polyvinyl alcohol (PVA) of iodine as the dichromatism pigment constitutes) and the polaroid that demonstrates the antiglare film of various total mist degree H% and transmission sharpness Tc% make each absorption axes consistent with the absorption axes of original polaroid.Then, in the darkroom, open the LCD TV obtain thus, under white show state from frontal and oblique visual observations and estimate the degree of color spot.Estimate the degree (evaluation is 3 observers' a mean value) of color spot with 5 grades of 1～5 according to following standard.
1: do not observe color spot fully.2: almost do not observe color spot.3: observe color spot slightly.
4: obviously observe color spot.5: it is serious to observe color spot.
＜embodiment 1 〉
(A) making of polarizing coating
With average degree of polymerization be about 2400, saponification degree be 99.9 moles more than the % and thickness be that the polyvinyl alcohol film of 75 μ m impregnated in 30 ℃ the pure water, the mass ratio that impregnated in iodine/potassium iodide/water then under 30 ℃ is in 0.02/2/100 the aqueous solution.Thereafter, the mass ratio that impregnated in potassium iodide/boric acid/water under 56.5 ℃ is in 12/5/100 the aqueous solution.After then washing with 8 ℃ pure water, 65 ℃ dry down, obtain that absorption is orientated the polarizing coating that iodine is arranged on polyvinyl alcohol (PVA).Stretch and mainly carry out in the operation of iodine staining and boric acid processing, total stretching ratio is 5.3 times.
(B) making of antiglare film
Prepare the ultra-violet solidified resin composition that following each composition is dissolved in the ethyl acetate with solid component concentration 60%.
60 parts of pentaerythritol triacrylates
40 parts of polyfunctional poly ammonia esterification of acrylic esters
(resultant of reaction of hexamethylene diisocyanate and pentaerythritol triacrylate)
Then; in 100 parts of the solid constituents of this ultra-violet solidified resin composition; adding weight average particle diameter is porous silica particle " the Sylysia " (trade name of 2.7 μ m; the manufacturing of シ リ シ ア KCC of Fuji) 3 part; interpolation is as " LucirinTPO " (BASF AG's manufacturing, chemical name: 2,4 of Photoepolymerizationinitiater initiater; 6-trimethylbenzoyl diphenyl phosphine oxide) 3 parts, makes coating fluid.
This coating fluid is coated on the uniaxial tension polyethylene terephthalate film (thickness is 40 μ m), and making dried coating thickness is 3 μ m, makes its dry 1 minute in being set at 80 ℃ dryer.By the ultra-violet solidified resin composition layer side of dried film, irradiation is 20mW/cm from intensity 2The light of high-pressure mercury-vapor lamp, make it reach 300mJ/cm with h ray conversion quantometer 2Thereby, the ultra-violet solidified resin composition layer is solidified, obtain the antiglare film that constitutes by the uniaxial tension polyethylene terephthalate film that forms the antiglare layer (cured resin) that has the micro concavo-convex shape from the teeth outwards.Thickness to the antiglare layer of the antiglare film that obtains is thus surveyed, and the result is 2.7 μ m.Need to prove that the thickness of the antiglare layer among the present invention is the result that the highest part in the protuberance of fine concaveconvex shape is measured.In addition, arithmetic mean height Pa and the maximum profile height Pt with the micro concavo-convex shape on the surface of antiglare layer is shown in table 1.
(C) making of anti-dazzle polarizer
On the single face of the above-mentioned polarizing coating that obtains; pass through tackifier; will be by the above-mentioned antiglare film of the present invention that obtains to fit with the face of the face opposition side that forms antiglare layer; on another face of polarizing coating; pass through tackifier; the tri acetyl cellulose film (thickness is 80 μ m) of fitting and handling through saponification, thus anti-dazzle polarizer obtained.Need to prove, constitute the uniaxial tension polyethylene terephthalate film of antiglare film, fit in the mode that the tensile axis of its slow axis and this polarizing coating intersects vertically.On the tri acetyl cellulose face of this front surface side polaroid, be provided with the layer of bonding agent (thickness is 25 μ m).
(D) making of liquid crystal panel and liquid crystal indicator
Peel off polaroid from the liquid crystal cells of the commercially available LCD TV (" LC-32GH3 " that Sharp Corporation makes) of the liquid crystal display cells (being image-displaying member) that is equipped with vertical alignment mode, at the polaroid " ス ミ カ ラ Application SRD341E " of the back side of liquid crystal cells (backlight side) side by the manufacturing of adhesive phase applying Sumitomo Chemical Co, in the front of liquid crystal cells (visible side) by the adhesive phase above-mentioned anti-dazzle polarizer of fitting, make the absorption axes of all polaroids all consistent, thereby make liquid crystal panel with the absorption axes direction that sticked on the polaroid on the LCD TV originally.Then, assemble this liquid crystal panel, make liquid crystal indicator (being image display device) with the formation of backlight/light diffusing sheet/liquid crystal panel.For this liquid crystal indicator, the color spot (interference spot) during from oblique watching is little.In addition, the warpage of liquid crystal panel is also little.
Be recorded in table 2 about other optical characteristics evaluation result.Need to prove the transmission sharpness of the antiglare film of the embodiment 1 shown in the table 2 detailed as described below.
The transmission sharpness
0.125mm light comb: 12.5%
0.5mm light comb: 9.4%
1.0mm light comb: 10.6%
2.0mm light comb; 33.4%
Add up to 65.9%
＜embodiment 2 and comparative example 1 〉
To be dispersed in as shown in table 1 change of weight portion of the filler (porous silica particle, simple marking is " silicon dioxide " in the table 1) in the coating fluid, in addition, antiglare film is made in operation similarly to Example 1, estimates optical characteristics.Be recorded in table 2 about the optical characteristics evaluation result.
＜embodiment 3～5 and comparative example 2 and 3 〉
Replace the porous silica particle, the filler that is dispersed in the coating fluid is changed to the spherical polystyrol particle that weight average particle diameter is 3.0 μ m (refractive index 1.59), with the weight portion that adds and antiglare layer thickness is as shown in table 1 changes, in addition, operation similarly to Example 1, make antiglare film, estimate optical characteristics.Be recorded in table 2 about the optical characteristics evaluation result.
＜comparative example 4 〉
Do not form antiglare layer on uniaxial tension polyethylene terephthalate film, in addition, operation is estimated similarly to Example 1.Be recorded in table 2 about the optical characteristics evaluation result.
Figure A200810184941D00281
Hence one can see that, and antiglare film of the present invention is a kind of antiglare film of excellence, and it also demonstrates excellent anti-dazzle performance when lowering color spot, and, owing to use stretching polyethylene terephthalate film, so physical strength is also high, and color spot does not take place when being disposed at image display device yet.Wherein, the embodiment 2 of the optimum condition of the discontented unabridged version invention of surperficial mist degree, reflectivity R (30), R (40) and R (50) produces speck.In addition, when the embodiment 5 of the optimum condition of the discontented unabridged version invention of internal haze is disposed at image display device, may make the whole deepening of screen, contrast descends.In the comparative example 1～4, since use stretching polyethylene terephthalate film, therefore, the physical strength height, but the key element of inventing because of the discontented unabridged version of the relation of total mist degree (H%) and transmission sharpness (Tc%), so obviously observe color spot when being disposed at image display device.
The possibility of utilizing on the industry
By showing to liquid crystal panel, plasma display device, CRT monitor, organic EL Show that the various displays such as device dispose antiglare film of the present invention, make this antiglare film be positioned at the image display element The visible side of part can not produce speck and the fuzzy projection image, obtains excellent observability. In addition, because its mechanical strength is also high, the warpage of therefore all right establishment panel etc.

Claims (9)

1. antiglare film, it is forming the antiglare layer that has fine concaveconvex shape on the surface on polyethylene terephthalate film, and wherein, total mist degree of this antiglare film is set at H%, when the transmission sharpness is set at Tc%, satisfies following relational expression (1),
Tc≤8H …(1)。
2. antiglare film, it is forming the antiglare layer that has fine concaveconvex shape on the surface on polyethylene terephthalate film, and wherein, total mist degree of this antiglare film is set at H%, when the transmission sharpness is set at Tc%, satisfies following relational expression (2),
Tc≤5H …(2)。
3. antiglare film, it is forming the antiglare layer that has fine concaveconvex shape on the surface on polyethylene terephthalate film, and wherein, total mist degree of this antiglare film is set at H%, when the transmission sharpness is set at Tc%, satisfies following relational expression (3),
Tc≤3H …(3)。
4. according to each described antiglare film in the claim 1～3, wherein, described polyethylene terephthalate film is uniaxial tension polyethylene terephthalate film or biaxial stretch-formed polyethylene terephthalate film, and its thickness is more than the 20 μ m and below the 100 μ m.
5. according to each described antiglare film in the claim 1～3, wherein, total mist degree of described antiglare film is made up of surperficial mist degree and internal haze, and described surperficial mist degree is more than 0.5% and below 15%, and described internal haze is more than 5% and below 40%.
6. according to each described antiglare film in the claim 1～3, wherein, from described antiglare layer side during with 30 ° of incident lights of incident angle, the reflectivity R (30) that reflection angle is 30 ° is more than 0.05% and below 2%, the reflectivity R (40) that reflection angle is 40 ° is more than 0.0001% and below 0.005%, and the reflectivity R (50) that reflection angle is 50 ° is more than 0.00001% and below 0.0005%.
7. according to each described antiglare film in the claim 1～3, wherein, on the surface of the fine concaveconvex shape of described antiglare layer, also has low-reflection film.
8. anti-dazzle polarizer, it is each described antiglare film and polarizing coating to be fitted form, wherein, described polarizing coating is configured on described antiglare film and the face face opposition side that forms described antiglare layer.
9. image display device, it possesses: each described antiglare film or described anti-dazzle polarizer of claim 8 and image-displaying member in the claim 1～3, wherein, described antiglare film or described anti-dazzle polarizer, with its antiglare layer side is the outside, is configured in the visible side of image-displaying member.
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