WO2011055624A1 - 偏光板、及び液晶表示装置 - Google Patents
偏光板、及び液晶表示装置 Download PDFInfo
- Publication number
- WO2011055624A1 WO2011055624A1 PCT/JP2010/068144 JP2010068144W WO2011055624A1 WO 2011055624 A1 WO2011055624 A1 WO 2011055624A1 JP 2010068144 W JP2010068144 W JP 2010068144W WO 2011055624 A1 WO2011055624 A1 WO 2011055624A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- hard coat
- polarizing plate
- coat layer
- tan
- Prior art date
Links
Images
Classifications
-
- G02B1/105—
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
- G02B1/14—Protective coatings, e.g. hard coatings
-
- 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
-
- 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
-
- 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
- G02F1/133528—Polarisers
Definitions
- the present invention relates to a polarizing plate and a liquid crystal display device.
- polarizing plate is composed of two cellulose-based protective films, each of which is a polarizing element (polarizing film) in which a polyvinyl alcohol (hereinafter abbreviated as PVA) film adsorbed and dyed with iodine or a dichroic dye is oriented in a certain direction.
- PVA polyvinyl alcohol
- the adhesive layer is provided in the cellulose protective film single side
- the protective film on the outermost surface of the polarizing plate used in the liquid crystal cell is particularly susceptible to physical damage, and when it is damaged, the display image quality is impaired. Therefore, a hard coat layer is formed on the substrate of the cellulose-based protective film. The provided hard coat film is used.
- a hard coat film is required to be a clear type rather than an anti-glare type that blurs the outline of an image reflected on the surface from the viewpoint of higher contrast and visibility (clearness).
- the polarizing plate provided with the adhesive layer of the liquid crystal display panel is stored under high temperature and high humidity for a long time, such as when it is transported, it will be partially deformed at the outermost surface of the polarizing plate due to blocking etc. It was easy to occur and was a problem in quality.
- Patent Document 1 discloses a polarizing plate technique for improving durability under high temperature and high humidity conditions. This technique improves the durability of a polarizing plate by treating a polarizing film, which is a hydrophilic polymer film, with an acidic solution and providing a protective film with a layer obtained by curing a polymerizable resin composition. .
- a polarizing film which is a hydrophilic polymer film
- an acidic solution and providing a protective film with a layer obtained by curing a polymerizable resin composition.
- the above technique can improve the discoloration of the polarizing plate to some extent, it cannot prevent the deformation failure that is the subject of the present invention.
- Patent Document 2 discloses a coating film containing at least one organic component having a polymerizable functional group, inorganic ultrafine particles, and inorganic and / or organic fine particles having a primary particle size larger than the primary particle size of the inorganic ultrafine particles.
- a technique for preventing blocking of a hard coat film by a hard coat film formed from components is disclosed.
- fine particles are added in order to sufficiently prevent blocking, haze is likely to increase, and there is still a problem in achieving both the prevention of deformation failure, which is the subject of the present invention, and visibility (clearness). It was.
- the objective of this invention is providing the polarizing plate which aimed at coexistence suppression of generation
- the arithmetic average roughness Ra (JIS B0601: 2001) of the hard coat layer is 2 to 20 nm.
- a ratio (Ra / RSm) of Ra and an average length RSm (JIS B0601: 2001) of contour curve elements is 3 ⁇ 10 ⁇ 4 to 2 ⁇ 10 ⁇ 3 .
- ) of the difference between the haze value (Hh) of the hard coat film and the haze value (Hf) of the base film is 0.02% to 0.3%.
- the polarizing plate according to any one of 1 to 4 above.
- tan ⁇ peak is the maximum value obtained by measuring tan ⁇ values from 25 ° C. to 210 ° C.
- tan ⁇ ⁇ 40 is the value of tan ⁇ at a temperature of ⁇ 40 ° C. when tan ⁇ peak is indicated.
- the polarizing plate according to any one of 1 to 7 above.
- a liquid crystal display device comprising the polarizing plate according to any one of 1 to 8 in at least one of liquid crystal cells.
- the polarizing plate which aimed at coexistence suppression of generation
- the present inventor has determined the ratio between the arithmetic average roughness Ra of the hard coat layer of the hard coat film to be bonded to the polarizing plate and the average length (RSm) of the contour curve elements in a specific range.
- the stress applied to each polarizing plate can be dispersed when the polarizing plate is stored in a stacked state, and the polarizing plate is stored by storing it under high temperature and high humidity conditions. It has been found that a partial deformation failure caused by a decrease in elastic modulus can be prevented and the present invention has been achieved.
- the hard coat film according to the present invention has a low haze value and clearness as a liquid crystal display device is not impaired, it is possible to achieve both suppression of partial deformation failure and visibility (clearness). .
- the hard coat layer according to the present invention has an arithmetic average roughness Ra of 2 to 20 nm, and a ratio (Ra / RSm) of the average length RSm of the contour curve elements is 3 ⁇ 10 ⁇ 4 to 2 ⁇ 10 ⁇ 3 . It is characterized by that.
- Arithmetic average roughness Ra is a value measured with an optical interference surface roughness meter (RST / PLUS, manufactured by WYKO) based on JIS B0601: 2001.
- the arithmetic average roughness Ra is 2 to 20 nm, more preferably 4 to 20 nm.
- the average length RSm of the contour curve element is a value measured with an optical interference type surface roughness meter (RST / PLUS, manufactured by WYKO) based on the provisions of JIS B0601: 2001, similarly to the arithmetic average roughness Ra. It is.
- RSm is preferably 3 to 80 ⁇ m, more preferably 5 to 70 ⁇ m.
- the hard coat layer according to the present invention preferably has a protrusion shape on the hard coat layer in order to achieve the arithmetic average roughness Ra (hereinafter also simply referred to as Ra) within the above range.
- the height of the protrusion shape is 1 nm to 1 ⁇ m, preferably 10 nm to 0.5 ⁇ m.
- the width is 50 nm to 100 ⁇ m, preferably 50 nm to 50 ⁇ m.
- the height and width of the protrusion shape can be obtained from cross-sectional observation.
- FIG. 1 is an explanatory view of the protrusion. As shown in FIG.
- the center line a is drawn on the cross-sectional observation image, and the distance between the two intersections of the lines b and c and the center line a forming the mountain ridge is defined as the protrusion size width t and did. Further, the distance from the summit to the center line a is obtained as the height h of the protrusion size.
- the number of protrusions of the hard coat layer is preferably 500 to 200000 pieces / mm 2 . Specifically, it can be measured by the following method.
- the number of protrusions was measured by measuring the hard coat layer with an optical interference surface roughness meter (RST / PLUS, manufactured by WYKO, magnification 50 times). Next, the number of protrusions in this measurement area (100 ⁇ m ⁇ 100 ⁇ m square) was read from the image. This series of measurements is performed 10 times, and the number of protrusions of the hard coat layer of the hard coat film can be determined from the average value of 10 times. As the number of protrusions, protrusions having a height of 3 nm or more from the average line of the roughness curve are counted.
- a method of forming a protrusion shape on the hard coat layer a method of adding fine particles to the hard coat layer, a method of forming a protrusion on the surface by pressing a mold against the hard coat layer, a reduction drying in a drying step of hard coat formation
- An example is the method of controlling the processing temperature of the section to a high temperature condition, etc.However, in the method of regularly forming the protrusion shape, such as the method of forming protrusions on the surface by pressing the mold, deformation failure occurs. A sufficient effect for suppression cannot be obtained.
- the method for forming the protrusion shape is not particularly limited, but the treatment temperature in the decreasing rate drying section in the drying step of the hard coat coating composition (hereinafter also referred to as the hard coat layer composition) is set.
- a method of controlling to a high temperature condition is preferable from the viewpoints of suppression of deformation failure occurrence, productivity, and reproducibility.
- the projection shape formed by this method is irregular, it is estimated that the stress distribution efficiency is better than that of the regular projection shape, and the occurrence of deformation failure can be suppressed well.
- the “irregular protrusion shape” of the present invention refers to a protrusion having various shapes whose shape and size are not determined, not a protrusion whose surface unevenness has a regular shape by embossing.
- protrusions having different widths and heights such as (a) and (b) shown in FIG. 1 are exemplified as irregularly shaped protrusions.
- the “irregular arrangement” means that the irregularly-protruding protrusions are not regularly arranged (for example, at regular intervals), but are irregularly arranged at random intervals, It may be isotropic or anisotropic.
- the irregular protrusions are irregularly arranged by observing the film surface with an optical interference type surface roughness meter (New View 5030, manufactured by Zygo).
- the haze value (Hh) of the hard coat film according to the present invention is preferably 0.7% or less from the viewpoint of clearness.
- the haze value (Hh) of the hard coat film is less than 0.2%, it is difficult to design from the viewpoint of the handleability of the hard coat film.
- ) of the difference between the haze value (Hh) of the hard coat film and the haze value (Hf) of the base film it is preferable in that sufficient brightness and high contrast can be obtained when used outdoors such as a large-sized liquid crystal display device or digital signage.
- the haze value of the hard coat layer In order to control the haze value of the hard coat layer, adjustment of the resin / solvent content and mass ratio of the resin constituting the hard coat layer, the type and amount of the additive and the hard coat coating composition, and drying at a reduced rate in the drying process It can be achieved with the processing temperature condition of the section. In addition, since the arithmetic average roughness Ra of the hard coat layer also affects the haze value as the surface haze, it is effective to control the shape and number of the protrusions.
- Haze measurement can be performed using a haze meter (NDH2000; manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS-K7136.
- the hard coat film according to the present invention is composed of at least a base film and a hard coat layer, and the hard coat layer contains an actinic radiation curable resin, and an actinic ray such as an ultraviolet ray or an electron beam (both active energy rays). It is preferably a layer mainly composed of a resin that cures through a crosslinking reaction upon irradiation.
- an actinic radiation curable resin a component containing a monomer having an ethylenically unsaturated double bond is preferably used, and an actinic radiation curable resin layer is formed by curing by irradiation with actinic radiation such as ultraviolet rays or electron beams.
- Typical examples of the actinic radiation curable resin include an ultraviolet curable resin and an electron beam curable resin, but the resin that is cured by ultraviolet irradiation is excellent in mechanical film strength (abrasion resistance, pencil hardness). preferable.
- an ultraviolet curable urethane acrylate resin for example, an ultraviolet curable urethane acrylate resin, an ultraviolet curable polyester acrylate resin, an ultraviolet curable epoxy acrylate resin, an ultraviolet curable polyol acrylate resin, or an ultraviolet curable epoxy resin is preferable. Used. Of these, ultraviolet curable acrylate resins are preferred.
- polyfunctional acrylate is preferable.
- the polyfunctional acrylate is preferably selected from the group consisting of pentaerythritol polyfunctional acrylate, dipentaerythritol polyfunctional acrylate, pentaerythritol polyfunctional methacrylate, and dipentaerythritol polyfunctional methacrylate.
- the polyfunctional acrylate is a compound having two or more acryloyloxy groups or methacryloyloxy groups in the molecule.
- polyfunctional acrylate monomer examples include ethylene glycol diacrylate, diethylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolethane triacrylate, and tetramethylolmethane triacrylate.
- the viscosity of the UV curable resin such as polyfunctional acrylate is preferably 3000 mPa ⁇ s or less, more preferably 1500 mPa ⁇ s or less, at 25 ° C. Particularly preferably, it is 1000 mPa ⁇ s or less.
- low viscosity resins include glycerin triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate and the like.
- the said viscosity is the value measured on 25 degreeC conditions using the B-type viscometer.
- Monofunctional acrylates include isobornyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, isostearyl acrylate, benzyl acrylate, ethyl carbitol acrylate, phenoxyethyl acrylate, lauryl acrylate, isooctyl acrylate, tetrahydrofurfuryl acrylate, behenyl Examples thereof include acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and cyclohexyl acrylate. Monofunctional acrylates can be obtained from Shin Nakamura Chemical Co., Ltd., Osaka Organic Chemical Industry Co., Ltd., and the like.
- the hard coat layer contains a photopolymerization initiator to accelerate the curing of the actinic radiation curable resin.
- photopolymerization initiator examples include acetophenone, benzophenone, hydroxybenzophenone, Michler's ketone, ⁇ -amyloxime ester, thioxanthone, and derivatives thereof, but are not particularly limited thereto. .
- the hard coat layer according to the present invention is substantially free of fine particles such as inorganic fine particles and organic fine particles and non-reactive polymer because it is difficult to obtain the object effect of the present invention and the clearness is lowered due to an increase in internal haze. It is preferable not to contain it.
- the term “substantially free of fine particles and non-reactive polymer” in the present invention means that the content contained in the hard coat layer is 0.01% by mass or less, excluding components extracted from the base film described later. .
- a non-reactive polymer is a compound that does not have a functional group such as an unsaturated double bond. Specifically, it is a (meth) acrylic or acrylic monomer, copolymerizable monomer or substrate. Examples of the film include thermoplastic acrylic resins and cellulose ester resins described later.
- the hard coat layer according to the present invention is provided by applying, drying and curing a hard coat layer coating composition diluted with a solvent that swells or partially dissolves the base film on the film base in the following manner. It is preferable from the point that a protrusion shape is easily obtained in the hard coat layer.
- a solvent for swelling or partially dissolving the base film a solvent containing a ketone and / or acetate is preferable.
- the coating amount is suitably 0.1 to 40 ⁇ m, preferably 0.5 to 30 ⁇ m, as the wet film thickness.
- the dry film thickness is from 0.1 to 30 ⁇ m, preferably from 1 to 20 ⁇ m, particularly preferably from 6 to 15 ⁇ m.
- the hard coat layer is coated on a film substrate using a known coating method such as a gravure coater, dip coater, reverse coater, wire bar coater, die coater, and ink jet method. It can be formed by coating, drying, UV curing, and if necessary, heat treatment after UV curing.
- Drying is preferably performed at a high temperature of 70 ° C. or higher, more preferably 80 ° C. or higher, and particularly preferably 90 ° C. or higher.
- the temperature in the reduced rate drying section is in the range of 95 ° C to 110 ° C.
- the drying process changes from a constant state to a gradually decreasing state when drying starts.
- the decreasing section is called the decreasing rate drying section.
- the constant rate drying section the amount of heat flowing in is all consumed for solvent evaporation on the coating film surface, and when the solvent on the coating film surface decreases, the evaporation surface moves from the surface to the inside and enters the decreasing rate drying section. Thereafter, the temperature of the coating film surface rises and approaches the hot air temperature, so that the temperature of the ultraviolet curable resin composition rises, the resin viscosity decreases, and the fluidity increases.
- any light source that generates ultraviolet rays can be used without limitation.
- a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
- Irradiation conditions vary depending on each lamp, but the irradiation amount of active rays is usually 50 to 1000 mJ / cm 2 , preferably 50 to 300 mJ / cm 2 .
- irradiating active rays it is preferably performed while applying tension in the film transport direction, more preferably while applying tension in the width direction.
- the tension to be applied is preferably 30 to 300 N / m.
- the method for applying tension is not particularly limited, and tension may be applied in the transport direction on the back roll, or tension may be applied in the width direction or biaxial direction by a tenter. Thereby, a film having further excellent flatness can be obtained.
- the hard coat layer may contain a conductive agent in order to impart antistatic properties, and preferred conductive agents include metal oxide particles or ⁇ -conjugated conductive polymers.
- An ionic liquid is also preferably used as the conductive compound.
- the hard coat layer has a nonionic surfactant such as a silicone surfactant, a fluorosurfactant or a polyoxyether, an anionic surfactant, from the viewpoint of coating properties and the uniform dispersibility of fine particles.
- a fluorine-siloxane graft polymer is graft polymer.
- the fluorine-siloxane graft polymer refers to a copolymer polymer obtained by grafting polysiloxane containing siloxane and / or organosiloxane alone and / or organopolysiloxane to at least a fluorine resin.
- Examples of commercially available products include ZX-022H, ZX-007C, ZX-049, ZX-047-D manufactured by Fuji Kasei Kogyo Co., Ltd. These components are preferably added in a range of 0.01 to 3% by mass with respect to the solid component in the coating solution.
- the hard coat layer may be a single layer or a plurality of layers.
- the hard coat layer may be divided into two or more layers.
- the thickness of the uppermost layer when two or more layers are provided is preferably in the range of 0.05 to 2 ⁇ m.
- Two or more layers may be formed as a simultaneous multilayer.
- the simultaneous multi-layering is to form a hard coat layer by applying two or more hard coat layers on a base material without going through a drying step.
- the layers are stacked one after another with an extrusion coater or simultaneously with a slot die having a plurality of slits. Can be done.
- the pencil hardness, which is an index of hardness, of the hard coat film in the present invention is H or more, more preferably 3H or more. If it is 3H or more, it is not only difficult to be scratched in the polarizing plate forming step of the liquid crystal display device, but also used for outdoor applications, and is a surface protective film for large liquid crystal display devices and liquid crystal display devices for digital signage. When used as an excellent film strength.
- the prepared hard coat film is conditioned at a temperature of 23 ° C. and a relative humidity of 55% for 2 hours or more, and then the pencil hardness evaluation specified by JIS K5400 is performed using a test pencil specified by JIS S 6006. It is the value measured according to the method.
- the base film is easy to manufacture, easily adheres to the hard coat layer, and is optically isotropic. Moreover, in this invention, a base film is used as a protective film.
- cellulose ester films such as triacetyl cellulose film, cellulose acetate propionate film, cellulose diacetate film, cellulose acetate butyrate film, polyethylene terephthalate, polyethylene naphthalate Polyester film, polycarbonate film, polyarylate film, polysulfone (including polyethersulfone) film, polyethylene film, polypropylene film, cellophane, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, syndiotactic Tick polystyrene film, norbornene resin film, polymethylpentene film Polyether ketone film, polyether ketone imide film, a polyamide film, a fluororesin film, a nylon film, cycloolefin polymer films, and polymethyl methacrylate film or an acrylic film or the like.
- cellulose ester films such as triacetyl cellulose film, cellulose acetate propionate film, cellulose diacetate film, cellulose
- cellulose ester films for example, Konica Minoltak KC8UX, KC4UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC4UE, KC4UE, and KC12UR (above, manufactured by Konica Minolta Opto, Polycarbonate) Olefin polymer films and polyester films are preferred, and in the present invention, cellulose ester films are particularly preferred from the viewpoint of production, cost, isotropic properties, and adhesiveness (saponification suitability).
- the refractive index of the base film is preferably 1.30 to 1.70, and more preferably 1.40 to 1.65.
- the refractive index is measured by the method of JIS K7142 using an upe refractometer 2T manufactured by Atago Co., Ltd.
- the base film has the following relationship with tan ⁇ measured by changing the temperature from 25 ° C. to 210 ° C. at a humidity of 55% RH in the width direction of the film. It is preferable from the point which exhibits.
- tan ⁇ peak is the maximum value obtained by measuring the tan ⁇ value by changing the temperature from 25 ° C. to 210 ° C.
- tan ⁇ ⁇ 40 is the value of tan ⁇ at a temperature of ⁇ 40 ° C. when tan ⁇ peak is indicated.
- the object effect of the present invention is more effectively exhibited by setting the temperature change of the tan ⁇ in the film width direction of the base film, that is, the ratio of the storage elastic modulus to the loss elastic modulus within the above range.
- the tan ⁇ was measured, for example, by using a sample that had been conditioned for 24 hours in an atmosphere of 23 ° C. and 55% RH in advance and increasing the temperature under the following conditions at a humidity of 55% RH or setting the temperature.
- Measuring device RSA III manufactured by TI Instruments Sample: width 5 mm, length 50 mm (gap set to 20 mm) Measurement conditions: Tensile mode Measurement temperature: 25-210 ° C or -40 ° C Temperature rising condition: 5 ° C / min Frequency: 1Hz ⁇ Cellulose ester film> Next, a cellulose ester film that is preferable as a substrate film will be described.
- the cellulose ester resin (hereinafter also referred to as cellulose ester) is preferably a lower fatty acid ester of cellulose.
- the lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 6 or less carbon atoms, such as cellulose acetate, cellulose propionate, cellulose butyrate and the like, and JP-A-10-45804 and 08-231761.
- Mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate as described in US Pat. No. 2,319,052 can be used.
- the lower fatty acid esters of cellulose that are particularly preferably used are cellulose triacetate and cellulose acetate propionate. These cellulose esters can be used alone or in combination.
- cellulose triacetate those having an average degree of acetylation (bound acetic acid amount) of 54.0 to 62.5% are preferably used, and more preferably an average degree of acetylation of 58.0 to 62.5%.
- acetylation bound acetic acid amount
- the cellulose triacetate has a degree of acetyl group substitution of 2.80 to 2.95, a number average molecular weight (Mn) of 125,000 or more and less than 155000, a weight average molecular weight (Mw) of 265,000 or more and less than 310,000, Mw Cellulose triacetate A / Mn of 1.9 to 2.1, acetyl group substitution degree of 2.75 to 2.90, number average molecular weight (Mn) of 155000 or more and less than 180,000, Mw of 290000 or more and less than 360,000 Mw / Mn preferably contains cellulose triacetate B which is 1.8 to 2.0.
- a preferred cellulose ester other than cellulose triacetate has an acyl group having 2 to 4 carbon atoms as a substituent, the substitution degree of acetyl group is X, and the substitution degree of propionyl group or butyryl group is Y, It is a cellulose ester containing the cellulose ester which satisfy
- Formula (II) 0 ⁇ X ⁇ 2.5 In particular, cellulose acetate propionate is preferably used, and among them, 1.9 ⁇ X ⁇ 2.5 and 0.1 ⁇ Y ⁇ 0.9 are preferable.
- the method for measuring the substitution degree of the acyl group can be measured according to ASTM-D817-96.
- the number average molecular weight (Mn) and molecular weight distribution (Mw) of the cellulose ester can be measured using high performance liquid chromatography.
- the measurement conditions are as follows.
- Acrylic resin includes methacrylic resin.
- the acrylic resin is not particularly limited, but is preferably composed of 50 to 99% by mass of methyl methacrylate units and 1 to 50% by mass of other monomer units copolymerizable therewith.
- Examples of other copolymerizable monomers include alkyl methacrylates having 2 to 18 alkyl carbon atoms, alkyl acrylates having 1 to 18 carbon atoms, alkyl acrylates such as acrylic acid and methacrylic acid.
- Unsaturated group-containing divalent carboxylic acids such as saturated acid, maleic acid, fumaric acid and itaconic acid, aromatic vinyl compounds such as styrene and ⁇ -methylstyrene, ⁇ , ⁇ -unsaturated nitriles such as acrylonitrile and methacrylonitrile, Examples thereof include maleic anhydride, maleimide, N-substituted maleimide, glutaric anhydride and the like, and these can be used alone or in combination of two or more monomers.
- methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate, and the like are preferable from the viewpoint of thermal decomposition resistance and fluidity of the copolymer.
- n-Butyl acrylate is particularly preferably used.
- the weight average molecular weight (Mw) is preferably 80,000 to 500,000, and more preferably 110,000 to 500,000.
- the weight average molecular weight of the acrylic resin can be measured by gel permeation chromatography including the measurement conditions.
- a manufacturing method of an acrylic resin You may use any well-known methods, such as suspension polymerization, emulsion polymerization, block polymerization, or solution polymerization.
- a polymerization initiator a normal peroxide type and an azo type can be used, and a redox type can also be used.
- the polymerization temperature may be 30 to 100 ° C. for suspension or emulsion polymerization, and 80 to 160 ° C. for bulk or solution polymerization.
- polymerization can be carried out using alkyl mercaptan or the like as a chain transfer agent.
- alkyl mercaptan Commercial products can also be used.
- Delpet 60N, 80N (Asahi Kasei Chemicals Co., Ltd.), Dianal BR52, BR80, BR83, BR85, BR88 (Mitsubishi Rayon Co., Ltd.), KT75 (Electrochemical Industry Co., Ltd.) and the like can be mentioned.
- Two or more acrylic resins can be used in combination.
- a graft copolymer obtained by grafting a (meth) acrylic resin to a copolymer of a (meth) acrylic rubber and an aromatic vinyl compound described in JP-A-2009-84574 may be used.
- a copolymer of (meth) acrylic rubber and an aromatic vinyl compound forms a core, and the (meth) acrylic resin forms a shell around the copolymer.
- -A shell-type graft copolymer is preferred.
- the total mass of the acrylic resin and the cellulose ester resin in the base film is preferably 55% by mass or more of the base film, more preferably 60% by mass or more, and particularly preferably 70% by mass or more.
- the base film may contain a resin other than thermoplastic acrylic resin and cellulose ester resin and additives.
- the base film may contain acrylic particles because it is excellent in improving brittleness.
- An acrylic particle represents the acrylic component which exists in the state of particle
- the acrylic particles are not particularly limited, but are preferably acrylic particles having a layer structure of two or more layers, and particularly preferably a multilayer structure acrylic granular composite.
- Examples of commercially available acrylic granular composites that are multi-layer structured polymers include, for example, “Metablene” manufactured by Mitsubishi Rayon Co., “Kaneace” manufactured by Kaneka Chemical Co., Ltd., “Paralloid” manufactured by Kureha Chemical Co., Ltd. “Acryloid” manufactured by Haas, “Staffyroid” manufactured by Ganz Kasei Kogyo Co., Ltd., “Parapet SA” manufactured by Kuraray Co., Ltd., and the like can be used, and these can be used alone or in combination of two or more.
- the refractive index of the mixture of acrylic resin and cellulose ester resin is close to the refractive index of the acrylic particles in order to obtain a highly transparent film.
- the refractive index difference between the acrylic particles and the acrylic resin is preferably 0.05 or less, more preferably 0.02 or less, and particularly preferably 0.01 or less.
- a plasticizer can also be used in combination with the base film in order to improve the fluidity and flexibility of the composition.
- the plasticizer include phthalate ester, fatty acid ester, trimellitic ester, phosphate ester, polyester, and epoxy. Of these, polyester and phthalate plasticizers are preferably used. Polyester plasticizers are superior in non-migration and extraction resistance compared to phthalate ester plasticizers such as dioctyl phthalate. It can be applied to a wide range of uses by selecting or using these plasticizers according to the use.
- the polyester plasticizer is a reaction product of a monovalent or tetravalent carboxylic acid and a monovalent or hexavalent alcohol, and is mainly obtained by reacting a divalent carboxylic acid with a glycol.
- Representative divalent carboxylic acids include glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, sebacic acid and the like.
- the polyester plasticizer is preferably an aromatic terminal ester plasticizer.
- the aromatic terminal ester plasticizer is preferably an ester compound having a structure obtained by reacting phthalic acid, adipic acid, at least one benzene monocarboxylic acid and at least one alkylene glycol having 2 to 12 carbon atoms. As long as it has an adipic acid residue and a phthalic acid residue as the structure of such a compound, when an ester compound is produced, it may be reacted as an acid anhydride or esterified product of dicarboxylic acid.
- benzene monocarboxylic acid component examples include benzoic acid, para-tert-butylbenzoic acid, orthotoluic acid, metatoluic acid, p-toluic acid, dimethylbenzoic acid, ethylbenzoic acid, normal propylbenzoic acid, aminobenzoic acid, acetoxybenzoic acid and the like. Most preferred is benzoic acid. Moreover, these can be used as a 1 type, or 2 or more types of mixture, respectively.
- alkylene glycol component having 2 to 12 carbon atoms examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,2-propanediol, 2-methyl 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2,2-diethyl-1, 3-propanediol (3,3-dimethylolpentane), 2-n-butyl-2-ethyl-1,3-propanediol (3,3-dimethylolheptane), 3-methyl-1,5-pentanediol 1 , 6-hexanediol, 2,2,4-trimethyl 1,3-pentanediol, 2-ethyl 1,3-hexan
- the aromatic terminal ester plasticizer may be either an oligoester type or a polyester type, and the molecular weight is preferably in the range of 100 to 10,000, but is preferably in the range of 350 to 3000.
- the acid value is 1.5 mgKOH / g or less, the hydroxyl value is 25 mgKOH / g or less, more preferably the acid value is 0.5 mgKOH / g or less, and the hydroxyl value is 15 mgKOH / g or less.
- the plasticizer is preferably added in an amount of 0.5 to 30 parts by mass with respect to 100 parts by mass of the base film.
- the base film may contain a sugar ester compound.
- the sugar ester compound is a compound obtained by esterifying all or part of the OH group of a sugar such as the following monosaccharide, disaccharide, trisaccharide or oligosaccharide, specifically, a compound represented by the general formula (1) Etc.
- R 1 to R 8 represent a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted arylcarbonyl group, and R 1 to R 8 may be the same or different.
- the compounds represented by the general formula (1) are shown below in more detail (compound 1-1 to compound 1-23), but are not limited thereto.
- the base film preferably contains an ultraviolet absorber, and examples of the ultraviolet absorber used include benzotriazole, 2-hydroxybenzophenone, and salicylic acid phenyl ester.
- the ultraviolet absorber used include benzotriazole, 2-hydroxybenzophenone, and salicylic acid phenyl ester.
- 2- 5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3 Triazoles such as 5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone And benzophenones.
- ultraviolet absorbers having a molecular weight of 400 or more are less likely to volatilize at a high boiling point and are difficult to disperse even during high-temperature
- Examples of the ultraviolet absorber having a molecular weight of 400 or more include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- (1, 1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol], bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis ( Hindered amines such as 1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonic acid Bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] Such as til] -4- [3- (3,5-di-tert-butyl
- 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole and 2,2-methylenebis [4- (1,1,3,3- Tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol] is particularly preferred.
- antioxidants can be added to the base film in order to improve the thermal decomposability and thermal colorability during the molding process. It is also possible to add an antistatic agent to give the base film antistatic performance.
- a flame retardant acrylic resin composition containing a phosphorus flame retardant may be used.
- Phosphorus flame retardants used here include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphorus. Examples thereof include one or a mixture of two or more selected from acid esters, halogen-containing condensed phosphates, halogen-containing condensed phosphonates, halogen-containing phosphites, and the like.
- triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) Examples thereof include phosphate and tris (tribromoneopentyl) phosphate.
- the base film is preferably a “film that does not cause ductile fracture”.
- the ductile fracture is a fracture caused by applying a stress larger than the strength of a certain material, and is defined as a fracture accompanied by significant elongation or drawing of the material until the final fracture.
- the fracture surface is characterized by numerous indentations called dimples.
- the dimensional change rate (%) is preferably less than 0.5%, and more preferably less than 0.3%.
- the substrate film has a defect with a diameter of 5 ⁇ m or more in the film plane of 1 piece / 10 cm square or less. More preferably, it is 0.5 piece / 10 cm square or less, more preferably 0.1 piece / 10 cm square or less.
- the diameter of the defect indicates the diameter when the defect is circular, and when it is not circular, the range of the defect is determined by observing with a microscope according to the following method, and the maximum diameter (diameter of circumscribed circle) is determined.
- the range of the defect is the size of the shadow when the defect is observed with the transmitted light of the differential interference microscope when the defect is a bubble or a foreign object. If the defect is a change in surface shape, such as transfer of a roll flaw or an abrasion, the size is confirmed by observing the defect with the reflected light of a differential interference microscope.
- the film When the number of defects is more than 1/10 cm square, for example, when a tension is applied to the film during processing in a later process, the film may be broken with the defect as a starting point and productivity may be reduced. Moreover, when the diameter of a defect becomes 5 micrometers or more, it can confirm visually by polarizing plate observation etc., and when used as an optical member, a bright spot may arise.
- the coating agent may not be formed uniformly, resulting in defects (coating defects).
- the defect is a void in the film (foaming defect) generated due to the rapid evaporation of the solvent in the drying process of the solution casting, a foreign matter in the film forming stock solution, or a foreign matter mixed in the film forming. This refers to the foreign matter (foreign matter defect) in the film.
- the base film preferably has a breaking elongation in at least one direction of 10% or more, more preferably 20% or more in the measurement based on JIS-K7127-1999.
- the upper limit of the elongation at break is not particularly limited, but is practically about 250%. In order to increase the elongation at break, it is effective to suppress defects in the film caused by foreign matter and foaming.
- the thickness of the base film is preferably 20 ⁇ m or more. More preferably, it is 30 ⁇ m or more.
- the upper limit of the thickness is not particularly limited, but in the case of forming a film by a solution casting method, the upper limit is about 250 ⁇ m from the viewpoint of applicability, foaming, solvent drying and the like.
- the thickness of the film can be appropriately selected depending on the application.
- the base film preferably has a total light transmittance of 90% or more, more preferably 93% or more. Moreover, as a realistic upper limit, it is about 99%. In order to achieve excellent transparency expressed by such total light transmittance, it is necessary not to introduce additives and copolymerization components that absorb visible light, or to remove foreign substances in the polymer by high-precision filtration. It is effective to reduce the diffusion and absorption of light inside the film.
- a production method such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, a hot press method, or the like can be used.
- melt casting film forming method From the viewpoint of suppressing the residual solvent using a cellulose ester resin or an acrylic resin for dissolution, a method of producing by a melt casting film forming method is preferable.
- Methods formed by melt casting can be classified into melt extrusion molding methods, press molding methods, inflation methods, injection molding methods, blow molding methods, stretch molding methods, and the like.
- the melt extrusion method is preferable, in which a film having excellent mechanical strength and surface accuracy can be obtained.
- solution casting by casting is preferred.
- melt casting film forming method is a method of extruding a film forming material onto a drum or an endless belt after the film forming material is heated to develop its fluidity.
- Organic solvent useful for forming the dope when the base film is produced by the solution casting method can be used without limitation as long as it dissolves acrylic resin, cellulose ester resin, and other additives at the same time. .
- methylene chloride as a non-chlorinated organic solvent, methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc.
- Methylene chloride, methyl acetate, ethyl acetate and acetone can be preferably used.
- the dope preferably contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- the dope composition is dissolved in%.
- linear or branched aliphatic alcohol having 1 to 4 carbon atoms examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, and tert-butanol. Ethanol is preferred because of the stability of these dopes, the relatively low boiling point, and good drying properties.
- the base film can be produced by a solution casting method.
- a step of preparing a dope by dissolving a resin and an additive in a solvent a step of casting the dope on a belt-like or drum-like metal support, and a step of drying the cast dope as a web , A step of peeling from the metal support, a step of stretching or maintaining the width, a step of further drying, and a step of winding up the finished film.
- the concentration of cellulose ester in the dope, and the concentration of cellulose ester resin / acrylic resin is preferably higher because the drying load after casting on the metal support can be reduced, but when the concentration of cellulose ester is too high during filtration The load increases, and the filtration accuracy deteriorates.
- the concentration that achieves both of these is preferably 10 to 35% by mass, and more preferably 15 to 25% by mass.
- the metal support in the casting process is preferably a mirror-finished surface, and a stainless steel belt or a drum whose surface is plated with a casting is preferably used as the metal support.
- the cast width can be 1 ⁇ 4m.
- the surface temperature of the metal support in the casting step is set to ⁇ 50 ° C. to below the temperature at which the solvent boils and does not foam. A higher temperature is preferred because the web can be dried faster, but if it is too high, the web may foam or the flatness may deteriorate.
- a preferable support temperature is appropriately determined at 0 to 100 ° C., and more preferably 5 to 30 ° C.
- the method for controlling the temperature of the metal support is not particularly limited, but there are a method of blowing hot air or cold air, and a method of contacting hot water with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
- the amount of residual solvent when peeling the web from the metal support is preferably 10 to 150% by mass, more preferably 20 to 40% by mass or 60 to 130% by mass. Particularly preferred is 20 to 30% by mass or 70 to 120% by mass.
- the amount of residual solvent is defined by the following formula.
- Residual solvent amount (% by mass) ⁇ (MN) / N ⁇ ⁇ 100 Note that M is the mass of a sample collected during or after the production of the web or film, and N is the mass after heating M at 115 ° C. for 1 hour.
- the web is peeled off from the metal support and further dried to make the residual solvent amount 1% by mass or less, more preferably 0. 0.1 mass% or less, particularly preferably 0 to 0.01 mass% or less.
- a roll drying method (a method in which webs are alternately passed through a plurality of rolls arranged above and below) and a method in which the web is dried while being conveyed by a tenter method are employed.
- the film can be sequentially or simultaneously stretched in the longitudinal direction (MD direction) and the lateral direction (TD direction).
- the draw ratios in the biaxial directions perpendicular to each other are preferably in the range of 1.0 to 2.0 times in the MD direction and 1.07 to 2.0 times in the TD direction, respectively. It is preferably performed in the range of 1.0 to 1.5 times and 1.07 to 2.0 times in the TD direction.
- a method in which a difference in peripheral speed is applied to a plurality of rolls and the roll peripheral speed difference is used to stretch the roll in the MD direction.
- a tenter it may be a pin tenter or a clip tenter.
- the film transport tension in the film forming process such as in the tenter depends on the temperature, but is preferably 120 N / m to 200 N / m, and more preferably 140 N / m to 200 N / m. 140 N / m to 160 N / m is most preferable.
- the glass transition temperature of the substrate film is Tg, (Tg-30) to (Tg + 100) ° C., more preferably (Tg-20) to (Tg + 80) ° C., and more preferably (Tg-5) to (T Tg + 20) ° C.
- the Tg of the base film can be controlled by the type of material constituting the film and the ratio of the constituting materials.
- the Tg when the film is dried is preferably 110 ° C. or higher, more preferably 120 ° C. or higher.
- the glass transition temperature is preferably 190 ° C. or lower, more preferably 170 ° C. or lower.
- the Tg of the film can be determined by the method described in JIS K7121.
- the surface is preferably roughened. Roughening the film surface is preferable because it improves not only the slipperiness but also the surface processability, particularly the adhesion of the hard coat layer.
- the arithmetic average roughness Ra is preferably 2.0 nm to 4.0 nm, more preferably 2.5 nm to 3.5 nm.
- the base film may be formed by a melt film forming method.
- the melt film-forming method refers to heating and melting a composition containing an additive such as a resin and a plasticizer to a temperature exhibiting fluidity, and then casting a melt containing a fluid cellulose ester.
- the molding method for heating and melting can be further classified into a melt extrusion molding method, a press molding method, an inflation method, an injection molding method, a blow molding method, a stretch molding method, and the like.
- the melt extrusion method is preferable from the viewpoint of mechanical strength and surface accuracy. It is preferable that a plurality of raw materials used for melt extrusion are usually kneaded in advance and pelletized.
- Pelletization may be performed by a known method. For example, dry cellulose ester, plasticizer, and other additives are fed to an extruder with a feeder and kneaded using a single-screw or twin-screw extruder, and formed into a strand from a die. It can be done by extrusion, water cooling or air cooling and cutting.
- Additives may be mixed before being supplied to the extruder, or may be supplied by individual feeders.
- a small amount of additives such as particles and antioxidants are preferably mixed in advance in order to mix uniformly.
- the extruder is preferably processed at as low a temperature as possible so that it can be pelletized so as to suppress the shearing force and prevent the resin from deteriorating (molecular weight reduction, coloring, gel formation, etc.).
- a twin screw extruder it is preferable to rotate in the same direction using a deep groove type screw. From the uniformity of kneading, the meshing type is preferable.
- Film formation is performed using the pellets obtained as described above.
- the raw material powder can be directly fed to the extruder by a feeder without being pelletized to form a film as it is.
- the melting temperature at the time of extrusion is about 200 to 300 ° C, filtered through a leaf disk type filter, etc. to remove foreign matter, and then formed into a film from the T die.
- the film is nipped by a cooling roll and an elastic touch roll, and solidified on the cooling roll.
- the extrusion flow rate is preferably carried out stably by introducing a gear pump.
- a stainless fiber sintered filter is preferably used as a filter used for removing foreign substances.
- the stainless steel fiber sintered filter is a united stainless steel fiber body that is intricately intertwined and compressed, and the contact points are sintered and integrated. The density of the fiber is changed depending on the thickness of the fiber and the amount of compression, and the filtration accuracy is improved. Can be adjusted.
- Additives such as plasticizers and particles may be mixed with the resin in advance, or may be kneaded in the middle of the extruder. In order to add uniformly, it is preferable to use a mixing apparatus such as a static mixer.
- the film temperature on the touch roll side when the film is nipped by the cooling roll and the elastic touch roll is preferably Tg or more and Tg + 110 ° C. or less of the film.
- a well-known roll can be used for the roll which has the elastic body surface used for such a purpose.
- the elastic touch roll is also called a pinching rotator.
- a touch roll disclosed in Japanese Patent No. 3194904, Japanese Patent No. 3422798, Japanese Patent Laid-Open No. 2002-36332, Japanese Patent Laid-Open No. 2002-36333, or the like can be preferably used. These can also use what is marketed.
- the film obtained as described above is stretched by the stretching operation after passing through the step of contacting the cooling roll.
- the stretching method a known roll stretching machine or tenter can be preferably used.
- the stretching temperature is usually preferably in the temperature range of Tg to Tg + 60 ° C. of the resin constituting the film.
- the end Before winding, the end may be slit and cut to the product width, and knurled (embossed) may be applied to both ends to prevent sticking or scratching during winding.
- the knurling method can process a metal ring having an uneven pattern on its side surface by heating or pressing.
- grip part of the clip of both ends of a film is cut out and reused.
- the hard coat film according to the present invention can be provided with functional layers such as a back coat layer and an antireflection layer.
- a back coat layer may be provided on the surface of the base film opposite to the side on which the hard coat layer is provided to prevent curling and sticking.
- examples of inorganic compounds include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, tin oxide, and oxide. Mention may be made of indium, zinc oxide, ITO, hydrated calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate.
- the particles contained in the backcoat layer are preferably 0.1 to 50% by mass with respect to the binder.
- the increase in haze is preferably 1.5% or less, more preferably 0.5% or less, and particularly preferably 0.1% or less.
- the binder is preferably a cellulose ester resin such as diacetylcellulose.
- the hard coat film according to the present invention can be used as an antireflection film having an external light antireflection function by coating an antireflection layer on the hard coat layer.
- the antireflection layer is preferably laminated in consideration of the refractive index, the film thickness, the number of layers, the layer order, and the like so that the reflectance is reduced by optical interference.
- the antireflection layer is preferably composed of a low refractive index layer having a refractive index lower than that of the support, or a combination of a high refractive index layer having a refractive index higher than that of the support and a low refractive index layer. Particularly preferably, it is an antireflection layer composed of three or more refractive index layers, and three layers having different refractive indexes from the support side are divided into medium refractive index layers (high refractive index layers having a higher refractive index than the support).
- an antireflection layer having a layer structure of four or more layers in which two or more high refractive index layers and two or more low refractive index layers are alternately laminated is also preferably used.
- the layer structure of the antireflection film the following structure can be considered, but it is not limited to this.
- the refractive index layer preferably contains silica-based fine particles, and the refractive index thereof is lower than the refractive index of the base film as a support, and is in the range of 1.30 to 1.45 at 23 ° C. and wavelength of 550 nm. Preferably there is.
- the film thickness of the low refractive index layer is preferably 5 nm to 0.5 ⁇ m, more preferably 10 nm to 0.3 ⁇ m, and most preferably 30 nm to 0.2 ⁇ m.
- the composition for forming a low refractive index layer preferably contains at least one kind of particles having an outer shell layer and porous or hollow inside as silica-based fine particles.
- the particles having the outer shell layer and having a porous or hollow interior are preferably hollow silica-based fine particles.
- composition for forming a low refractive index layer may contain an organosilicon compound represented by the following general formula (OSi-1), a hydrolyzate thereof, or a polycondensate thereof.
- OSi-1 organosilicon compound represented by the following general formula (OSi-1)
- hydrolyzate thereof a hydrolyzate thereof
- polycondensate thereof a polycondensate thereof.
- R represents an alkyl group having 1 to 4 carbon atoms. Specifically, tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane and the like are preferably used.
- a solvent and if necessary, a silane coupling agent, a curing agent, a surfactant and the like may be added.
- the polarizing plate of the present invention using the hard coat film according to the present invention will be described.
- the polarizing plate can be produced by a general method.
- the back surface side of the hard coat film according to the present invention is subjected to alkali saponification treatment, and a completely saponified polyvinyl alcohol aqueous solution is used on at least one surface of a polarizing film prepared by immersing and stretching the treated hard coat film in an iodine solution. It is preferable to stick them together.
- the hard coat film may be used on the other surface, or another polarizing plate protective film may be used.
- an optical compensation film (retardation film) having a retardation of in-plane retardation Ro of 590 nm, 20 to 70 nm, and Rt of 70 to 400 nm may be used to obtain a polarizing plate capable of widening the viewing angle. it can.
- These can be produced, for example, by the method of JP-A-2002-71957.
- the optically anisotropic layer can be formed by the method described in JP-A-2003-98348.
- polarizing plate protective films preferably used include KC8UX2MW, KC4UX, KC5UX, KC4UY, KC8UY, KC12UR, KC4UEW, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC4FR-2, KC4FR-2, KC4FR-2, KC8FR-2 KC4UE (Konica Minolta Opto Co., Ltd.) etc. are mentioned.
- the polarizing film which is the main component of the polarizing plate, is an element that transmits only light having a polarization plane in a certain direction.
- a typical polarizing film known at present is a polyvinyl alcohol polarizing film, which is a polyvinyl alcohol film.
- polarizing film a polyvinyl alcohol aqueous solution is formed and dyed by uniaxially stretching or dyed, or uniaxially stretched after dyeing, and then preferably subjected to a durability treatment with a boron compound.
- a polarizing film having a thickness of 5 to 30 ⁇ m, preferably 8 to 15 ⁇ m is preferably used.
- one side of the hard coat film according to the present invention is bonded to form a polarizing plate. It is preferably bonded with an aqueous adhesive mainly composed of completely saponified polyvinyl alcohol or the like.
- the pressure-sensitive adhesive layer used on one side of the protective film to be bonded to the substrate of the liquid crystal cell is preferably optically transparent and exhibits moderate viscoelasticity and adhesive properties.
- the adhesive layer include adhesives or adhesives such as acrylic copolymers, epoxy resins, polyurethane, silicone polymers, polyethers, butyral resins, polyamide resins, polyvinyl alcohol resins, and synthetic rubbers.
- a film such as a drying method, a chemical curing method, a thermal curing method, a thermal melting method, a photocuring method, or the like can be formed and cured using a polymer such as the above.
- the acrylic copolymer can be preferably used because it is most easy to control the physical properties of the adhesive and is excellent in transparency, weather resistance, durability and the like.
- the hard coat film according to the present invention is incorporated in a polarizing plate, and is a reflective type, transmissive type, transflective liquid crystal display device or TN type, STN type, OCB type, HAN type, VA type (PVA type, MVA type), IPS. It is preferably used in liquid crystal display devices of various driving systems such as a type and OCB type.
- Example 1 ⁇ Preparation of cellulose triacetate film 1> ⁇ Preparation of ester compound 1> 251 g of 1,2-propylene glycol, 278 g of phthalic anhydride, 91 g of adipic acid, 610 g of benzoic acid, 0.191 g of tetraisopropyl titanate as an esterification catalyst, 2 L four-neck equipped with a thermometer, stirrer, and slow cooling tube The flask is charged and gradually heated with stirring until it reaches 230 ° C. in a nitrogen stream.
- the ester compound 1 was obtained by carrying out a dehydration condensation reaction for 15 hours, and distilling off unreacted 1,2-propylene glycol under reduced pressure at 200 ° C. after completion of the reaction.
- the acid value was 0.10 and the number average molecular weight was 450.
- the prepared dope solution was uniformly cast on a stainless steel band support.
- the solvent was evaporated until the residual solvent amount reached 100%, and the stainless steel band support was peeled off.
- the web of the peeled cellulose ester film was evaporated at 35 ° C., slit to 1.65 m width, 1.3 times in the TD direction (film width direction) with a tenter, and the draw ratio in the MD direction was 1.01.
- the film was dried at a drying temperature of 160 ° C. while being stretched by a factor of 2.
- the residual solvent amount at the start of drying was 20%. Then, after drying for 15 minutes while transporting the inside of a drying device at 120 ° C.
- the cellulose triacetate film 1 was obtained.
- the residual solvent amount of the cellulose triacetate film 1 was 0.2%, the film thickness was 40 ⁇ m, and the number of turns was 3900 m.
- ⁇ Preparation of hard coat film 1> Using the produced cellulose triacetate film 1 as a base film 1, the following hard coat layer composition 1 filtered through a polypropylene filter having a pore size of 0.4 ⁇ m was applied using a micro gravure coater, After drying at a constant rate drying zone temperature of 95 ° C. and a decreasing rate drying zone temperature of 95 ° C., the irradiance of the irradiated part is 100 mW using an ultraviolet lamp while purging with nitrogen so that the oxygen concentration becomes 1.0% by volume or less. in / cm 2, thereby curing the coated layer to irradiation dose as 0.3 J / cm 2, to form a hard coat layer 1 dry thickness 7 [mu] m, and wound to prepare a hard coat film 1 of a roll.
- Hard Coat Layer Composition 1 The following composition was stirred and mixed with a disper to obtain a hard coat layer composition 1. Moreover, when only resin was measured on 25 degreeC conditions using the B-type viscosity meter, resin viscosity was 490 mPa * s.
- Radical polymerizable fluororesin (A): Cephalal coated CF-803 (hydroxyl value 60, number average molecular weight 15,000; manufactured by Central Glass Co., Ltd.)
- One-end radically polymerizable polysiloxane (B): Silaplane FM-0721 (number average molecular weight 5,000; manufactured by Chisso Corporation)
- Radical polymerization initiator Perbutyl O (t-butylperoxy-2-ethylhexanoate; manufactured by NOF Corporation)
- Curing agent Sumidur N3200 (biuret type prepolymer of hexamethylene diisocyanate; manufactured by Sumika Bayer Urethane Co., Ltd.) (Synthesis of radical polymerizable fluororesin)
- a glass reactor equipped with a mechanical stirrer, a thermometer, a condenser and a dry nitrogen gas inlet was added to cefal coat CF-803 (1554 parts by mass), xylene
- a hard coat film 3 was produced in the same manner except that the temperature at which the rate of decrease drying interval was changed to 110 ° C.
- ⁇ Preparation of hard coat film 4> In the production of the hard coat film 1, a hard coat film 4 was produced in the same manner, except that the rate of decrease in drying interval was changed to 115 ° C.
- ⁇ Preparation of hard coat film 8> In the production of the hard coat film 5, a hard coat film 8 was produced in the same manner, except that the temperature of the decreasing rate drying zone was changed to 55 ° C.
- 2008-276198 (use a mold roll with regularly arranged molds)
- the coating layer was irradiated with an irradiance of 100 mW / cm 2 and an irradiation amount of 0.3 J / cm 2 using an ultraviolet lamp while purging with nitrogen so that the atmosphere had an oxygen concentration of 1.0% by volume or less.
- a hard coat layer 9 having a dry film thickness of 7 ⁇ m was formed. Winding and roll-shaped hard coat film 9 were produced.
- a hard coat film 10 was produced in the same manner except that the temperature in the decreasing rate drying section was changed to 80 ° C.
- the obtained PVA film was continuously processed in the order of pre-swelling, dyeing, uniaxial stretching by a wet method, fixing treatment, drying, and heat treatment to produce a polarizing film. That is, the PVA film was immersed in water at a temperature of 30 ° C. for 30 seconds to be pre-swelled, and immersed in an aqueous solution having an iodine concentration of 0.4 g / liter and a potassium iodide concentration of 40 g / liter at a temperature of 35 ° C. for 3 minutes. Subsequently, the film was uniaxially stretched 6 times in a 50% aqueous solution with a boric acid concentration of 4% under a tension of 700 N / m.
- the potassium iodide concentration was 40 g / liter, and the boric acid concentration was 40 g / liter. Then, it was immersed in an aqueous solution having a zinc chloride concentration of 10 g / liter and a temperature of 30 ° C. for 5 minutes for fixing treatment. Thereafter, the PVA film was taken out, dried with hot air at a temperature of 40 ° C., and further heat-treated at a temperature of 100 ° C. for 5 minutes. The obtained polarizing film had an average thickness of 13 ⁇ m, a polarizing performance of a transmittance of 43.0%, a polarization degree of 99.5%, and a dichroic ratio of 40.1.
- a polarizing plate 101 was produced by bonding the polarizing film 3, the protective film 4 and the hard coat film 1 in accordance with the following steps 1 to 4.
- Step 1 The polarizing film 3 described above was immersed in a storage tank of a polyvinyl alcohol adhesive solution having a solid content of 2% by mass for 1 to 2 seconds.
- Step 2 Alkali saponification treatment was performed on the hard coat film 1 and the protective film 4 each having a peelable protective film (PET) attached to the hard coat layer under the following conditions.
- PET peelable protective film
- Step 3 The laminate was laminated with two rotating rollers at a pressure of 20 to 30 N / cm 2 and a speed of about 2 m / min. At this time, it was carried out with care to prevent bubbles from entering.
- Step 4 The sample prepared in Step 3 was dried in a dryer at a temperature of 100 ° C. for 5 minutes to prepare a polarizing plate.
- Step 5 A commercially available acrylic adhesive is applied to the base film 1 of the polarizing plate prepared in Step 4 so that the thickness after drying is 25 ⁇ m, and dried in an oven at 110 ° C. for 5 minutes to form an adhesive layer. Then, a peelable protective film was attached to the adhesive layer. This polarized light was cut (punched) into a size of 576 ⁇ 324 mm, and the polarizing plate 101 was produced.
- Polarizers 102 to 110 were produced in the same manner except that the hard coat film 1 was changed to the hard coat films 2 to 10 in the production of the polarizer 101.
- ⁇ Production of Liquid Crystal Display Device 401> Remove the polarizing plate of NEC notebook PC LaVie G type liquid crystal panel, and make the above-prepared polarizing plate 101 (see FIG. 2 for the configuration) as the polarizing plate on the viewing side so that the hard coat layer is on the viewing side, Layer 5 and liquid crystal cell glass were bonded together. Further, on the backlight side, an acrylic adhesive having a thickness of 25 ⁇ m is used for the polarizing plate 201 that is laminated and bonded so as to sandwich the polarizing film with the base film 1 that has been subjected to alkali saponification treatment in the same manner as described above. A liquid crystal panel 301 was prepared by pasting the liquid crystal cell glass. Next, the liquid crystal panel 301 was set on a liquid crystal television, and a liquid crystal display device 401 was manufactured.
- Liquid crystal display devices 402 to 410 were prepared in the same manner except that the polarizing plate 101 was changed to the polarizing plates 102 to 110 in the production of the liquid crystal display device 401.
- Hard coat film (Hard coat film) a. Measurement of Arithmetic Average Roughness Ra and Average Length RSm of Contour Curve Element Using the optical interference type surface roughness meter (RST / PLUS, manufactured by WYKO), the hard coat layers of hard coat films 1 to 10 produced above were measured. The measurement was performed 10 times, and the average average roughness Ra of each hard coat film and the average length RSm of the contour curve elements were determined from the average of the measurement results.
- RST / PLUS optical interference type surface roughness meter
- the haze value (Hf) of the base film was 0.28%.
- the liquid crystal display devices 401 to 410 produced above were placed on a desk 80 cm high from the floor. Next, on the ceiling 3m high from the floor, there are 10 sets of 40W x 2 daylight straight tube fluorescent lamps (FLR40S ⁇ D / MX Panasonic Corporation) at 1.5m intervals. Arranged. In this case, when the evaluator is in front of the display surface of the liquid crystal display panel, the fluorescent lamp is arranged so that the fluorescent lamp comes to the ceiling portion from the evaluator's overhead to the rear. Next, the visibility of the liquid crystal display devices 401 to 410 was evaluated according to the following criteria. The obtained results are shown in Table 1.
- both the arithmetic average roughness Ra of the hard coat layer and the ratio of Ra to the average length RSm of the contour curve element (Ra / RSm) have the scope of the present invention.
- the polarizing plate of the present invention composed of is excellent in deformation failure resistance when stored under high temperature and high humidity and visibility (clearness) when used in a liquid crystal display device, and is capable of preventing deformation failure and visibility. It can be seen that the performance is compatible. Further, it can be seen that the polarizing plate of the present invention in which the arithmetic average roughness Ra of the hard coat layer is 4 to 20 nm has particularly excellent deformation failure prevention performance.
- the hard coat film constituting the polarizing plate of the present invention has an arithmetic average roughness Ra of the hard coat layer by controlling the temperature of the decreasing rate drying section in the drying step after coating to 95 ° C. to 110 ° C. This is preferable because it can be controlled within the scope of the invention.
- ) of the haze change of the hard coat film constituting the polarizing plate of the present invention is 0.02% to 0.3%. Excellent balance.
- the hard coat film according to the present invention was conditioned at 23 ° C. and 55% RH for 24 hours, and then, using a test pencil specified by JIS-S6006, according to the pencil hardness evaluation method specified by JIS-K5400, 500 g The pencil hardness was tested using a weight.
- the pencil hardness of the hard coat film according to the present invention was 3H or more.
- Example 2 In preparation of the hard coat film 1, the cellulose triacetate of the base film 1 and the ester compound 1 were changed as described in Table 2 to prepare base films 2 and 3. Next, hard coat films 11 and 12 were produced in the same manner except that the hard coat layer 1 was provided on these substrates. Using these produced hard coat films 11 and 12, polarizing plates 111 and 112 and liquid crystal display devices 411 and 412 were produced.
- the cellulose triacetate B1 shown in Table 2 has an acetyl substitution degree of 2.85 and a number average molecular weight of 120,000.
- the ester compound B is a compound synthesized by the following method.
- ester compound B > 251 g of 1,2-propylene glycol, 370 g of adipic acid, 122 g of benzoic acid, and 0.09 g of tetraisopropyl titanate as an esterification catalyst were charged into a 2 L four-necked flask equipped with a thermometer, a stirrer, and a quick cooling tube. The temperature is gradually raised with stirring until it reaches 230 ° C. in an air stream. Ester compound B was obtained by carrying out dehydration condensation reaction for 15 hours, and distilling off unreacted 1,2-propylene glycol under reduced pressure at 200 ° C. after completion of the reaction. The acid value was 0.55 and the number average molecular weight was 500.
- the dynamic viscoelasticity of the base film was measured under the following conditions to determine tan ⁇ ⁇ 40 / tan ⁇ peak .
- the sample used was conditioned at 23 ° C. and 55% RH for 24 hours in advance, and the humidity was 55% RH and the temperature was increased under the following conditions, or the temperature was set and measured.
- Measuring device RSA III manufactured by TI Instruments Sample: width 5 mm, length 50 mm (gap set to 20 mm) Measurement conditions: Tensile mode Measurement temperature: 25-210 ° C or -40 ° C Temperature rising condition: 5 ° C / min Frequency: 1Hz
- Example 3 In the production of the hard coat film 1, the monofunctional acrylate is applied to the hard coat layer coating composition 1, and the kind and the total amount of acrylate are 100 parts by mass with respect to the polyfunctional acrylate (pentaerythritol tri / tetraacrylate).
- Hard coat films 13 to 23 were produced in the same manner except that the addition amount was changed as shown in Table 3. Using these produced hard coat films 13 to 23, polarizing plates 113 to 123 and liquid crystal display devices 413 to 423 were produced.
- the polyfunctional acrylate pentaerythritol tri / tetraacrylate is PETA.
- the monofunctional acrylate 2-hydroxypropyl acrylate (Osaka Organic Chemical Co., Ltd.) was indicated as HPA, benzyl acrylate (Osaka Organic Chemical Co., Ltd.) was indicated as BZA, and tetrahydrofurfuryl acrylate (Osaka Organic Chemical Co., Ltd.) was indicated as THFA.
- a hard coat film provided with a hard coat layer containing a monofunctional acrylate and having a mass ratio of polyfunctional acrylate to monofunctional acrylate of polyfunctional acrylate: monofunctional acrylate 80: 20 to 98: 2
Abstract
Description
ここでtanδpeakとは、25℃~210℃のtanδ値を測定した最大値、tanδ-40とは、tanδpeakを示した時の温度-40℃でのtanδの値をいう。
本発明に係るハードコート層は、算術平均粗さRaが2~20nmであり、輪郭曲線要素の平均長さRSmの比(Ra/RSm)が3×10-4~2×10-3であることを特徴とする。
本発明に係るハードコートフィルムのヘーズ値(Hh)は、クリア性から0.7%以下が好ましい。また、ハードコートフィルムのヘーズ値(Hh)が0.2%未満は、ハードコートフィルムの取り扱い性の点から、設計が実情困難である。ハードコートフィルムのヘーズ値(Hh)と基材フィルムのヘーズ値(Hf)との差の絶対値(|Hh-Hf|)が、0.02%~0.3%とすることで、本発明の目的効果を達成するばかりか、大型化された液晶表示装置やデジタルサイネージ等の屋外で用いられる際の、十分な輝度や高いコントラストが得られる点でも好ましい。
本発明に係るハードコートフィルムは、少なくとも基材フィルムとハードコート層によって構成されており、該ハードコート層は活性線硬化樹脂を含有し、紫外線や電子線のような活性線(活性エネルギー線ともいう)照射により、架橋反応を経て硬化する樹脂を主たる成分とする層であることが好ましい。
基材フィルムは製造が容易であること、ハードコート層と接着し易いこと、光学的に等方性であることが好ましい。また、本発明では基材フィルムを保護フィルムとして使用する。
ここでtanδpeakとは、25℃から210℃まで温度変化させてtanδ値を測定した最大値、tanδ-40とは、tanδpeakを示した時の温度-40℃でのtanδの値をいう。
試料:幅5mm、長さ50mm(ギャップ20mmに設定)
測定条件:引張モード
測定温度:25~210℃、または-40℃
昇温条件:5℃/min
周波数:1Hz
〈セルロースエステルフィルム〉
次に基材フィルムとして好ましい、セルロースエステルフィルムについて説明する。
式(II) 0≦X≦2.5
特にセルロースアセテートプロピオネートが好ましく用いられ、中でも1.9≦X≦2.5、0.1≦Y≦0.9であることが好ましい。アシル基の置換度の測定方法はASTM-D817-96に準じて測定することが出来る。
カラム:Shodex K806、K805、K803G(昭和電工(株)製を3本接続して使用した)
カラム温度:25℃
試料濃度:0.1質量%
検出器:RI Model 504(GLサイエンス社製)
ポンプ:L6000(日立製作所(株)製)
流量:1.0ml/min
校正曲線:標準ポリスチレンSTK standard ポリスチレン(東ソー(株)製)
Mw=1000000~500迄の13サンプルによる校正曲線を使用した。13サンプルは、ほぼ等間隔に用いることが好ましい。
本発明に係る基材フィルムには、熱可塑性アクリル樹脂とセルロースエステル樹脂とを含有し、熱可塑性アクリル樹脂とセルロースエステル樹脂の含有質量比が、熱可塑性アクリル樹脂:セルロースエステル樹脂=95:5~50:50であるフィルムを用いても良い。
基材フィルムは脆性の改善に優れる点から、アクリル粒子を含有しても良い。アクリル粒子とは、前記熱可塑性アクリル樹脂及びセルロースエステル樹脂を相溶状態で含有する基材フィルム中に粒子の状態(非相溶状態ともいう)で存在するアクリル成分を表す。
基材フィルムには、組成物の流動性や柔軟性を向上するために、可塑剤を併用することもできる。可塑剤としては、フタル酸エステル系、脂肪酸エステル系、トリメリット酸エステル系、リン酸エステル系、ポリエステル系、あるいはエポキシ系等が挙げられる。この中で、ポリエステル系とフタル酸エステル系の可塑剤が好ましく用いられる。ポリエステル系可塑剤は、フタル酸ジオクチルなどのフタル酸エステル系の可塑剤に比べて非移行性や耐抽出性に優れる。用途に応じてこれらの可塑剤を選択、あるいは併用することによって、広範囲の用途に適用できる。
以下に一般式(1)で示される化合物をより具体的(化合物1-1~化合物1-23)に示すが、これらに限定はされない。
基材フィルムの製膜方法の例を説明するが、これに限定されるものではない。
基材フィルムを溶液流延法で製造する場合のドープを形成するのに有用な有機溶媒は、アクリル樹脂、セルロースエステル樹脂、その他の添加剤を同時に溶解するものであれば制限なく用いることが出来る。
基材フィルムは、溶液流延法によって製造する事が出来る。溶液流延法では、樹脂および添加剤を溶剤に溶解させてドープを調製する工程、ドープをベルト状もしくはドラム状の金属支持体上に流延する工程、流延したドープをウェブとして乾燥する工程、金属支持体から剥離する工程、延伸または幅保持する工程、更に乾燥する工程、仕上がったフィルムを巻き取る工程により行われる。
なお、Mはウェブまたはフィルムを製造中または製造後の任意の時点で採取した試料の質量で、NはMを115℃で1時間の加熱後の質量である。
延伸工程では、フィルムの長手方向(MD方向)、及び幅手方向(TD方向)に対して、逐次または同時に延伸することができる。互いに直交する2軸方向の延伸倍率は、それぞれ最終的にはMD方向に1.0~2.0倍、TD方向に1.07~2.0倍の範囲とすることが好ましく、MD方向に1.0~1.5倍、TD方向に1.07~2.0倍の範囲で行うことが好ましい。例えば、複数のロールに周速差をつけ、その間でロール周速差を利用してMD方向に延伸する方法、ウェブの両端をクリップやピンで固定し、クリップやピンの間隔を進行方向に広げてMD方向に延伸する方法、同様に横方向に広げてTD方向に延伸する方法、或いはMD/TD方向同時に広げてMD/TD両方向に延伸する方法などが挙げられる。
基材フィルムは、溶融製膜法によって製膜しても良い。溶融製膜法は、樹脂および可塑剤などの添加剤を含む組成物を、流動性を示す温度まで加熱溶融し、その後、流動性のセルロースエステルを含む溶融物を流延することをいう。
本発明に係るハードコートフィルムには、バックコート層、反射防止層等の機能性層を設けることができる。
本発明に係るハードコートフィルムは、基材フィルムのハードコート層を設けた側と反対側の面に、カールやくっつき防止の為にバックコート層を設けてもよい。
本発明に係るハードコートフィルムは、ハードコート層の上層に反射防止層を塗設して、外光反射防止機能を有する反射防止フィルムとして用いることができる。
基材フィルム/ハードコート層/中屈折率層/低屈折率層
基材フィルム/ハードコート層/中屈折率層/高屈折率層/低屈折率層
基材フィルム/ハードコート層/高屈折率層(導電性層)/低屈折率層
基材フィルム/ハードコート層/防眩性層/低屈折率層
反射防止フィルムには必須である低屈折率層は、シリカ系微粒子を含有することが好ましく、その屈折率は、支持体である基材フィルムの屈折率より低く、23℃、波長550nm測定で、1.30~1.45の範囲であることが好ましい。
前記一般式で表される有機珪素化合物は、式中、Rは炭素数1~4のアルキル基を表す。具体的には、テトラメトキシシラン、テトラエトキシシラン、テトライソプロポキシシラン等が好ましく用いられる。
本発明に係るハードコートフィルムを用いた本発明の偏光板について述べる。偏光板は一般的な方法で作製することができる。本発明に係るハードコートフィルムの裏面側をアルカリ鹸化処理し、処理したハードコートフィルムを、ヨウ素溶液中に浸漬延伸して作製した偏光膜の少なくとも一方の面に、完全鹸化型ポリビニルアルコール水溶液を用いて貼り合わせることが好ましい。
液晶セルの基板と貼り合わせるために保護フィルムの片面に用いられる粘着剤層は、光学的に透明であることはもとより、適度な粘弾性や粘着特性を示すものが好ましい。
本発明に係るハードコートフィルムを用いて作製した本発明の偏光板を表示装置に組み込むことによって、種々の視認性に優れた画像表示装置を作製することができる。
実施例1
<セルローストリアセテートフィルム1の作製>
〈エステル化合物1の調製〉
1,2-プロピレングリコール251g、無水フタル酸278g、アジピン酸91g、安息香酸610g、エステル化触媒としてテトライソプロピルチタネート0.191gを、温度計、撹拌器、緩急冷却管を備えた2Lの四つ口フラスコに仕込み、窒素気流中230℃になるまで、撹拌しながら徐々に昇温する。15時間脱水縮合反応させ、反応終了後200℃で未反応の1,2-プロピレングリコールを減圧留去することにより、エステル化合物1を得た。酸価0.10、数平均分子量450であった。
アエロジルR812(日本アエロジル(株)製) 10質量部
(一次粒子の平均径7nm)
エタノール 90質量部
以上をディゾルバーで30分間撹拌混合した後、マントンゴーリンで分散を行った。二酸化珪素分散液に88質量部のメチレンクロライドを撹拌しながら投入し、ディゾルバーで30分間撹拌混合し、二酸化珪素分散希釈液を作製した。微粒子分散希釈液濾過器(アドバンテック東洋(株):ポリプロピレンワインドカートリッジフィルターTCW-PPS-1N)で濾過した。
セルローストリアセテートA1 90質量部
(リンター綿から合成されたセルローストリアセテート、アセチル基置換度2.88、Mn=140000)
エステル化合物1 10質量部
チヌビン928(BASFジャパン(株)製) 2.5質量部
二酸化珪素分散希釈液 4質量部
メチレンクロライド 432質量部
エタノール 38質量部
以上を密閉容器に投入し、加熱し、撹拌しながら、完全に溶解し、安積濾紙(株)製の安積濾紙No.24を使用して濾過し、ドープ液を調製した。
上記作製したセルローストリアセテートフィルム1を基材フィルム1として、その上に、下記のハードコート層組成物1を孔径0.4μmのポリプロピレン製フィルターで濾過したものを、マイクログラビアコーターを用いて塗布し、恒率乾燥区間温度95℃、減率乾燥区間温度95℃で乾燥の後、酸素濃度が1.0体積%以下の雰囲気になるように窒素パージしながら、紫外線ランプを用い照射部の照度が100mW/cm2で、照射量を0.3J/cm2として塗布層を硬化させ、ドライ膜厚7μmのハードコート層1を形成し、巻き取り、ロール状のハードコートフィルム1を作製した。
下記組成物をディスパーにて撹拌混合し、ハードコート層組成物1を得た。また、樹脂だけを25℃条件にて、B型粘度計を用いて測定したところ、樹脂粘度は490mPa・sであった。
フッ素-シロキサングラフトポリマーの調製に用いた素材の市販品名を示す。
片末端ラジカル重合性ポリシロキサン(B):サイラプレーンFM-0721(数平均分子量5,000;チッソ(株)製)
ラジカル重合開始剤:パーブチルO(t-ブチルパーオキシ-2-エチルヘキサノエート;日本油脂(株)製)
硬化剤:スミジュールN3200(ヘキサメチレンジイソシアネートのビウレット型プレポリマー;住化バイエルウレタン(株)製)
(ラジカル重合性フッ素樹脂の合成)
機械式撹拌装置、温度計、コンデンサー及び乾燥窒素ガス導入口を備えたガラス製反応器に、セフラルコートCF-803(1554質量部)、キシレン(233質量部)、及び2-イソシアナトエチルメタクリレート(6.3質量部)を入れ、乾燥窒素雰囲気下で80℃に加熱した。80℃で2時間反応し、サンプリング物の赤外吸収スペクトルによりイソシアネートの吸収が消失したことを確認した後、反応混合物を取り出し、ウレタン結合を介して50質量%のラジカル重合性フッ素樹脂を得た。
機械式撹拌装置、温度計、コンデンサー及び乾燥窒素ガス導入口を備えたガラス製反応器に、上記合成したラジカル重合性フッ素樹脂(26.1質量部)、キシレン(19.5質量部)、酢酸n-ブチル(16.3質量部)、メチルメタクリレート(2.4質量部)、n-ブチルメタクリレート(1.8質量部)、ラウリルメタクリレート(1.8質量部)、2-ヒドロキシエチルメタクリレート(1.8質量部)、FM-0721(5.2質量部)、及びパーブチルO(0.1質量部)を入れ、窒素雰囲気中で90℃まで加熱した後、90℃で2時間保持した。パーブチルO(0.1部)を追加し、さらに90℃で5時間保持することによって、重量平均分子量が171,000である35質量%フッ素-シロキサングラフトポリマーの溶液を得た。重量平均分子量はGPCにより求めた。また、フッ素-シロキサングラフトポリマーの質量%はHPLC(液体クロマトグラフィー)により求めた。
(NKエステルA-TMM-3L、新中村化学工業(株)製)
イルガキュア184(BASFジャパン(株)製) 5質量部
フッ素-シロキサングラフトポリマー(35質量%) 2質量部
プロピレングリコールモノメチルエーテル 10質量部
酢酸メチル 45質量部
メチルエチルケトン 45質量部
ハードコートフィルム1表面を光学干渉式表面粗さ計(Zygo社製 New View 5030)で観察した結果、図4に示すように不規則な突起形状が不規則に配列していることが分かった。
ハードコートフィルム1の作製において、減率乾燥区間温度を105℃に変更した以外は、同様にして、ハードコートフィルム2を作製した。
ハードコートフィルム1の作製において、減率乾燥区間温度を110℃に変更した以外は、同様にして、ハードコートフィルム3を作製した。
ハードコートフィルム1の作製において、減率乾燥区間温度を115℃に変更した以外は、同様にして、ハードコートフィルム4を作製した。
ハードコートフィルム1の作製において、ハードコート層組成物1の酢酸メチル、及びメチルエチルケトンの添加量をそれぞれ60質量部に変更し、また減率乾燥区間温度を80℃に変更した以外は、同様にして、ハードコートフィルム5を作製した。
ハードコートフィルム1の作製において、ハードコート層組成物1のフッ素-シロキサングラフトポリマー(35質量%)を信越化学工業社製のKF-354L(ポリエーテル変性シリコーン)に変更し、減率乾燥区間温度を120℃に変更した以外は、同様にして、ハードコートフィルム6を作製した。
ハードコートフィルム5の作製において、減率乾燥区間温度を120℃に変更した以外は、同様にして、ハードコートフィルム7を作製した。
ハードコートフィルム5の作製において、減率乾燥区間温度を55℃に変更した以外は、同様にして、ハードコートフィルム8を作製した。
ハードコートフィルム1の作製において、ハードコート層組成物1を孔径0.4μmのポリプロピレン製フィルターで濾過したものを、マイクログラビアコーターを用いてセルローストリアセテートフィルム1の表面に塗布し、恒率乾燥区間温度90℃、減率乾燥区間温度55℃で乾燥の後、特開2008-276198号公報の実施例を参考にして作製した鋳型ロールで型押し後(鋳型ロールは鋳型が規則正しく配列されたものを使用した)、酸素濃度が1.0体積%以下の雰囲気になるように窒素パージしながら、紫外線ランプを用い照射部の照度が100mW/cm2で、照射量を0.3J/cm2として塗布層を硬化させ、ドライ膜厚7μmのハードコート層9を形成した。巻き取り、ロール状のハードコートフィルム9を作製した。
ハードコートフィルム1の作製において、減率乾燥区間の温度を80℃に変更した以外は、同様にして、ハードコートフィルム10を作製した。
(アルカリ鹸化処理)
ハードコートフィルム1を偏光膜3の一方の面に貼り付け、セルローストリアセテートフィルム1からなる保護フィルム4を偏光膜3の他方の面に貼り付けて、偏光板101を作製した。
けん化度99.95モル%、重合度2400のポリビニルアルコール(以下、PVAと略記する)100質量部に、グリセリン10質量部、及び水170質量部を含浸させたものを溶融混練し、脱泡後、Tダイから金属ロール上に溶融押出し、製膜した。その後、乾乾燥・熱処理してPVAフィルムを得た。得られたPVAフィルムは、平均厚みが25μm、水分率が4.4%、フィルム幅が3mであった。
下記工程1~4に従って、偏光膜3と、保護フィルム4とハードコートフィルム1を貼り合わせて偏光板101を作製した。
ケン化工程 2.5M-KOH 50℃ 120秒
水洗工程 水 30℃ 60秒
中和工程 10質量部HCl 30℃ 45秒
水洗工程 水 30℃ 60秒
ケン化処理後、水洗、中和、水洗の順に行い、次いで100℃で乾燥。
偏光板101の作製において、ハードコートフィルム1をハードコートフィルム2~10に、それぞれ変更した以外は同様にして偏光板102~110を作製した。
NEC製ノートPC LaVie Gタイプの液晶パネルの偏光板を剥がし、視認側の偏光板として上記作製した偏光板101(構成は図2参照)をハードコート層が視認側となるようにして、粘着剤層5と液晶セルガラスとを貼合した。また、バックライト側には、上記手順と同様にアルカリ鹸化処理した基材フィルム1で偏光膜を挟持するように積層配置して貼合した偏光板201を厚さ25μmのアクリル系粘着剤を用いて液晶セルガラスに貼合して、液晶パネル301を作製した。次に液晶パネル301を液晶テレビにセットし、液晶表示装置401を作製した。
液晶表示装置401の作製において、偏光板101を偏光板102~110に、それぞれ変更した以外は同様にして液晶表示装置402~410を作製した。
上記作製したハードコートフィルム1~10、偏光板101~110及び画像表示装置401~410について下記の評価を行った。
a.算術平均粗さRa及び輪郭曲線要素の平均長さRSmの測定
上記作製したハードコートフィルム1~10のハードコート層を、光学干渉式表面粗さ計(RST/PLUS、WYKO社製)を用いて10回測定し、その測定結果の平均から、各ハードコートフィルムの算術平均粗さRa及び輪郭曲線要素の平均長さRSmを求めた。
基材フィルムのヘーズ(Hf)をJIS-K7136に準じて、ヘーズメーター(NDH2000;日本電色工業株式会社製)を用いて測定した。次に、上記作製した各ハードコートフィルム(Hh)のヘーズを基材フィルムと同様にして測定した。
a.耐久性試験
偏光板101~110のハードコート層の剥離性の保護フィルムを剥離せずに、偏光板を図3のように各75枚重ね、一番下の偏光板は更に粘着層介してガラス板上に貼り合わせ、90℃95%の条件で200時間保存した。
上記耐久試験を実施した偏光板をハードコート層側から観察して、変形故障の状態を以下の基準で観察した。
○:僅かな部分で変形故障がみられるが、実害上問題なし
△:部分的に変形故障がみられる。実害上問題あり
×:部分的な変形故障が、遠くから見てもはっきりと発生している事がみえる。
a.視認性(クリア性)評価
上記作製した液晶表示装置401~410について、床から80cmの高さの机上に配置した。次に、床から3mの高さの天井部に、昼色光直管蛍光灯(FLR40S・D/M-X パナソニック(株)製)40W×2本を1セットとして、1.5m間隔で10セット配置した。この場合、評価者が液晶表示パネルの表示面の正面にいるときに、評価者の頭上より後方に向けて天井部に蛍光灯がくるように配置した。次に、液晶表示装置401~410の視認性を以下の基準で評価した。得られた結果を表1に示した。
△:蛍光灯が僅かに白っぽくぼけて見える
×:蛍光灯がぼけて白っぽく見える。
ハードコートフィルム1の作製において、基材フィルム1のセルローストリアセテート、及びエステル化合物1を表2に記載したように変更し、基材フィルム2及び3を作製した。次に、それら基材にハードコート層1を設けた以外は、同様にしてハードコートフィルム11及び12を作製した。これら作製したハードコートフィルム11及び12を用いて、偏光板111及び112、及び液晶表示装置411及び412を作製した。
実施例1の偏光板の耐久性試験において、保存時間を300時間に変更した以外は同様にして、実施例1で作製した偏光板101及び液晶表示装置401と、上記作製したハードコートフィルム11及び12、偏光板111及び112、液晶表示装置411及び412を評価した。
1,2-プロピレングリコール251g、アジピン酸370g、安息香酸122g、エステル化触媒としてテトライソプロピルチタネート0.09gを、温度計、撹拌器、緩急冷却管を備えた2Lの四つ口フラスコに仕込み、窒素気流中230℃になるまで、撹拌しながら徐々に昇温する。15時間脱水縮合反応させ、反応終了後200℃で未反応の1,2-プロピレングリコールを減圧留去することにより、エステル化合物Bを得た。酸価0.55、数平均分子量500であった。
下記条件で基材フィルムの動的粘弾性を測定し、tanδ-40/tanδpeakを求めた。試料はあらかじめ23℃55%RHの雰囲気下24時間調湿したものを使用し、湿度55%RH、下記条件で昇温させながら、または温度設定して測定した。
試料:幅5mm、長さ50mm(ギャップ20mmに設定)
測定条件:引張モード
測定温度:25~210℃、または-40℃
昇温条件:5℃/min
周波数:1Hz
ハードコートフィルム1の作製において、ハードコート層塗布組成物1に単官能アクリレートを、多官能アクリレート(ペンタエリスリトールトリ/テトラアクリレート)に対して、アクリレートの総量が100質量部となるように、種類及び添加量を表3に記載したように変化させて加えた以外は、同様にしてハードコートフィルム13~23を作製した。これら作製したハードコートフィルム13~23を用いて、偏光板113~123、及び液晶表示装置413~423を作製した。
実施例1の偏光板の耐久性試験において、保存時間を400時間に変更した以外は同様にして、実施例1で作製した偏光板101及び液晶表示装置401と、上記作製したハードコートフィルム13~23、偏光板113~123及び液晶表示装置413~423を評価した。得られた結果を表3に示した。
1a 基材フィルム
1b ハードコート層
3 偏光膜
4 保護フィルム
5 粘着層(剥離性保護フィルムが貼り付いた状態)
6 ガラス板
101 偏光板
Claims (9)
- 保護フィルム、偏光膜及び基材フィルム上にハードコート層を有するハードコートフィルムがこの順序で積層された偏光板において、該ハードコート層の算術平均粗さRa(JIS B0601:2001)が2~20nmであり、かつRaと輪郭曲線要素の平均長さRSm(JIS B0601:2001)の比(Ra/RSm)が3×10-4~2×10-3であることを特徴とする偏光板。
- 前記ハードコート層の算術平均粗さRa(JIS B0601:2001)が4~20nmであることを特徴とする請求項1に記載の偏光板。
- 前記ハードコート層が突起形状を有し、該突起形状が不規則であることを特徴とする請求項1または2に記載の偏光板。
- 前記ハードコート層が微粒子及び/または非反応性ポリマーを実質的に含有しないことを特徴とする請求項1~3のいずれか1項に記載の偏光板。
- 前記ハードコートフィルムのヘーズ値(Hh)と基材フィルムのヘーズ値(Hf)との差の絶対値(|Hh-Hf|)が、0.02%~0.3%であることを特徴とする請求項1~4のいずれか1項に記載の偏光板。
- 前記ハードコート層が、基材フィルム上に塗布後の乾燥工程における減率乾燥区間の温度を95℃~110℃で処理されて設けられたことを特徴とする請求項1~5のいずれか1項に記載の偏光板。
- 前記基材フィルムのフィルム幅手方向のtanδが、下記の関係を有することを特徴とする請求項1~6のいずれか1項に記載の偏光板。
0.5≧tanδ-40/tanδpeak≧0.24
ここでtanδpeakとは、25℃~210℃のtanδ値を測定した最大値、tanδ-40とは、tanδpeakを示した時の温度-40℃でのtanδの値をいう。 - 前記ハードコート層が多官能アクリレートと単官能アクリレートを含有し、多官能アクリレートと単官能アクリレートの含有質量比が、多官能アクリレート:単官能アクリレート=80:20~98:2であることを特徴とする請求項1~7のいずれか1項に記載の偏光板。
- 請求項1~8のいずれか1項に記載の偏光板を液晶セルの少なくとも一方に有することを特徴とする液晶表示装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020127010388A KR101342183B1 (ko) | 2009-11-06 | 2010-10-15 | 편광판 및 액정 표시 장치 |
JP2011539327A JPWO2011055624A1 (ja) | 2009-11-06 | 2010-10-15 | 偏光板、及び液晶表示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-254843 | 2009-11-06 | ||
JP2009254843 | 2009-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011055624A1 true WO2011055624A1 (ja) | 2011-05-12 |
Family
ID=43969864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/068144 WO2011055624A1 (ja) | 2009-11-06 | 2010-10-15 | 偏光板、及び液晶表示装置 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2011055624A1 (ja) |
KR (1) | KR101342183B1 (ja) |
WO (1) | WO2011055624A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013024964A (ja) * | 2011-07-19 | 2013-02-04 | Konica Minolta Advanced Layers Inc | 防眩性フィルム、防眩性フィルムの製造方法、偏光板及び立体画像表示装置 |
JP2013088438A (ja) * | 2011-10-13 | 2013-05-13 | Konica Minolta Advanced Layers Inc | 光学フィルム、その製造方法及び画像表示装置 |
WO2014103686A1 (ja) * | 2012-12-25 | 2014-07-03 | 大日本印刷株式会社 | 光学積層体、これを用いた偏光板及び画像表示装置 |
JP6343057B1 (ja) * | 2017-03-31 | 2018-06-13 | 住友化学株式会社 | プロテクトフィルム付偏光板及び光学積層体 |
KR20180110819A (ko) * | 2017-03-30 | 2018-10-11 | 동우 화인켐 주식회사 | 광학 필름을 포함하는 편광판 및 화상 표시 장치 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101655630B1 (ko) * | 2014-12-30 | 2016-09-23 | 주식회사 효성 | 노르보넨 필름용 첨가제, 및 이를 포함하는 광학 필름 |
KR102655726B1 (ko) * | 2016-09-30 | 2024-04-05 | 엘지디스플레이 주식회사 | 편광판 및 이를 구비한 액정표시장치 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10244618A (ja) * | 1997-03-04 | 1998-09-14 | Nippon Kayaku Co Ltd | ハードコート体 |
JP2003302503A (ja) * | 2002-01-09 | 2003-10-24 | Konica Minolta Holdings Inc | 人工照明用反射防止フィルム、人工照明用反射防止層の形成方法、人工照明用偏光板、表示装置及び表示装置の反射防止方法 |
JP2004042653A (ja) * | 2002-07-12 | 2004-02-12 | Nitto Denko Corp | ハードコートフィルム |
JP2007171555A (ja) * | 2005-12-22 | 2007-07-05 | Sumitomo Osaka Cement Co Ltd | ハードコート膜と光学機能膜及び光学レンズ並びに光学部品 |
WO2008026514A1 (fr) * | 2006-09-01 | 2008-03-06 | Konica Minolta Opto, Inc. | Procédé de fabrication d'un film d'acylate de cellulose, film d'acylate de cellulose, plaque de polarisation et dispositif d'affichage à cristaux liquides |
JP2009091544A (ja) * | 2007-09-21 | 2009-04-30 | Konica Minolta Opto Inc | ハードコートフィルムの製造方法、ハードコートフィルム、偏光板及び表示装置 |
-
2010
- 2010-10-15 JP JP2011539327A patent/JPWO2011055624A1/ja active Pending
- 2010-10-15 KR KR1020127010388A patent/KR101342183B1/ko active IP Right Grant
- 2010-10-15 WO PCT/JP2010/068144 patent/WO2011055624A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10244618A (ja) * | 1997-03-04 | 1998-09-14 | Nippon Kayaku Co Ltd | ハードコート体 |
JP2003302503A (ja) * | 2002-01-09 | 2003-10-24 | Konica Minolta Holdings Inc | 人工照明用反射防止フィルム、人工照明用反射防止層の形成方法、人工照明用偏光板、表示装置及び表示装置の反射防止方法 |
JP2004042653A (ja) * | 2002-07-12 | 2004-02-12 | Nitto Denko Corp | ハードコートフィルム |
JP2007171555A (ja) * | 2005-12-22 | 2007-07-05 | Sumitomo Osaka Cement Co Ltd | ハードコート膜と光学機能膜及び光学レンズ並びに光学部品 |
WO2008026514A1 (fr) * | 2006-09-01 | 2008-03-06 | Konica Minolta Opto, Inc. | Procédé de fabrication d'un film d'acylate de cellulose, film d'acylate de cellulose, plaque de polarisation et dispositif d'affichage à cristaux liquides |
JP2009091544A (ja) * | 2007-09-21 | 2009-04-30 | Konica Minolta Opto Inc | ハードコートフィルムの製造方法、ハードコートフィルム、偏光板及び表示装置 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013024964A (ja) * | 2011-07-19 | 2013-02-04 | Konica Minolta Advanced Layers Inc | 防眩性フィルム、防眩性フィルムの製造方法、偏光板及び立体画像表示装置 |
JP2013088438A (ja) * | 2011-10-13 | 2013-05-13 | Konica Minolta Advanced Layers Inc | 光学フィルム、その製造方法及び画像表示装置 |
WO2014103686A1 (ja) * | 2012-12-25 | 2014-07-03 | 大日本印刷株式会社 | 光学積層体、これを用いた偏光板及び画像表示装置 |
JPWO2014103686A1 (ja) * | 2012-12-25 | 2017-01-12 | 大日本印刷株式会社 | 光学積層体、これを用いた偏光板及び画像表示装置 |
US10241235B2 (en) | 2012-12-25 | 2019-03-26 | Dai Nippon Printing Co., Ltd. | Optical layered object, polarizer obtained using same, and image display device |
KR20180110819A (ko) * | 2017-03-30 | 2018-10-11 | 동우 화인켐 주식회사 | 광학 필름을 포함하는 편광판 및 화상 표시 장치 |
KR101978876B1 (ko) | 2017-03-30 | 2019-05-15 | 동우 화인켐 주식회사 | 광학 필름을 포함하는 편광판 및 화상 표시 장치 |
JP6343057B1 (ja) * | 2017-03-31 | 2018-06-13 | 住友化学株式会社 | プロテクトフィルム付偏光板及び光学積層体 |
CN108693588A (zh) * | 2017-03-31 | 2018-10-23 | 住友化学株式会社 | 带防护膜的偏振板和光学层叠体 |
JP2018173550A (ja) * | 2017-03-31 | 2018-11-08 | 住友化学株式会社 | プロテクトフィルム付偏光板及び光学積層体 |
Also Published As
Publication number | Publication date |
---|---|
KR20120056302A (ko) | 2012-06-01 |
JPWO2011055624A1 (ja) | 2013-03-28 |
KR101342183B1 (ko) | 2013-12-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5751249B2 (ja) | ハードコートフィルム、その製造方法、偏光板、及び液晶表示装置 | |
JP5799954B2 (ja) | 防眩性フィルム、防眩性フィルムの製造方法、偏光板及び液晶表示装置 | |
JP5423382B2 (ja) | ハードコートフィルムの製造方法 | |
WO2011055624A1 (ja) | 偏光板、及び液晶表示装置 | |
KR101618423B1 (ko) | 방현성 필름, 그 제조 방법, 편광판, 화상 표시 장치 및 터치 패널용 부재 | |
JP6048419B2 (ja) | ハードコートフィルムの製造方法及び偏光板の製造方法 | |
US20120295040A1 (en) | Hard coat film, polarizing plate and liquid crystal display device | |
WO2012026192A1 (ja) | ハードコートフィルム、偏光板、及び液晶表示装置 | |
JP5971121B2 (ja) | 光学フィルムの製造方法 | |
JP2013064821A (ja) | ハードコートフィルム、偏光板及び画像表示装置 | |
JP5382118B2 (ja) | 偏光板、及び液晶表示装置 | |
JP5980465B2 (ja) | 偏光板及びそれを用いた液晶表示装置 | |
JP6048506B2 (ja) | 光学フィルム | |
JP2006251163A (ja) | 反射防止フィルム、偏光板及びこれらを用いた画像表示装置 | |
JP2011118088A (ja) | 長尺状偏光板、及び液晶表示装置 | |
JP2005275391A (ja) | 反射防止フィルムおよび製造方法、並びに偏光板およびそれを用いた液晶表示装置 | |
JP2012068562A (ja) | 画像表示装置 | |
JP2013088438A (ja) | 光学フィルム、その製造方法及び画像表示装置 | |
JP5640989B2 (ja) | 偏光板及びそれを用いた液晶表示装置 | |
JP5707855B2 (ja) | ハードコートフィルムの製造方法 | |
JP2017102368A (ja) | 偏光板保護フィルム及びそれを具備した偏光板 | |
JP2013064813A (ja) | 偏光板保護フィルム、偏光板保護フィルムの製造方法、偏光板及び液晶表示装置 | |
JP2014061643A (ja) | 光学フィルムの製造方法 | |
JP2012068291A (ja) | 液晶表示装置の背面側偏光板及びそれが具備された液晶表示装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10828184 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011539327 Country of ref document: JP |
|
ENP | Entry into the national phase |
Ref document number: 20127010388 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10828184 Country of ref document: EP Kind code of ref document: A1 |