CN109313301A

CN109313301A - Polarization plates component

Info

Publication number: CN109313301A
Application number: CN201780034986.6A
Authority: CN
Inventors: 白石贵志
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2016-06-09
Filing date: 2017-05-29
Publication date: 2019-02-05
Also published as: WO2017212960A1; KR20190016082A; JP2017223940A; TW201804222A

Abstract

The object of the present invention is to provide a kind of polarization plates components, and when being configured in hygrothermal environment and hot environment, amount of warpage is small, it is possible to reduce because the display caused by issuable warpage is uneven.The present invention provides a kind of polarization plates component, it is the front side polarization plates comprising being configured at a surface side of liquid crystal cells, with the polarization plates component for the back side polarization plates for being configured at another surface side, the front side polarization plates have the first protective film and the first polarizing film, from the side far from liquid crystal cells, stack gradually first protective film, first polarizing film, first protective film is following film, i.e., with slow axis, at 85 DEG C, in the case of standing 100 is small in the environment of humidity 5%, there is 0.1~1.0% shrinking percentage in the slow-axis direction, and the elasticity modulus of 85 DEG C of the slow-axis direction is 1000MPa~3000MPa, the slow axis of first protective film and the absorption axiss angulation of the first polarizing film are 60 ° or more and 90 ° or less, the back side lateral deviation Vibration plate has the second polarizing film.

Description

Polarization plates component

Technical field

The present invention relates to one kind polarization plates components used in various optical applications.

Background technique

Based on the reason of the image forming mode of liquid crystal display device, polarizing film is configured in the two sides of liquid crystal cells.

The liquid crystal surface of polarizing film is configured in the front side of liquid crystal cells and back side for example, being disclosed in patent document 1 Plate.In addition, being disclosed the optical laminate of the front side and back side that are configured at liquid crystal cells in patent document 2.

According to liquid crystal display panel disclosed in above-mentioned patent document 1 and optical laminate disclosed in Patent Document 2, attempted Relationship by specified configuration in the polarizing coating and the thickness for the polarizing coating for being configured at back side of front side reduces liquid crystal display panel Warpage.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2012-58429 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2013-37115 bulletin

Summary of the invention

Problem to be solved by the invention

In the past, the warpage being only conceived under hot environment, as long as controlling it, the warpage of liquid crystal display panel will not be at For problem.However, having distinguished, as the thickness of liquid crystal cells is thinning, even because being generated under hygrothermal environment (60 DEG C 90%) Slight size changing amount caused by polarization plates stress, can also observe the warpage of liquid crystal cells significantly.

Invention disclosed in patent document 1 and 2 under wet heat condition in use, the warpage of liquid crystal display panel is big.Therefore, base In the reason of the warpage, removed there are liquid crystal display panel from touch screen or the problem of backlight unit falls off.

Thus, the object of the present invention is to provide a kind of polarization plates components, can not only inhibit the liquid under hot environment The warpage of crystal panel, additionally it is possible to inhibit the warpage of the liquid crystal display panel under hygrothermal environment.

The method for solving problem

The present invention includes the following contents.

[1] a kind of polarization plates component is the front side polarization plates comprising being configured at a surface side of liquid crystal cells and is configured at The polarization plates component of the back side polarization plates of another surface side,

The front side polarization plates have the first protective film and the first polarizing film, from the side far from liquid crystal cells, according to It is secondary that first protective film, first polarizing film is laminated,

First protective film is following film, that is, has slow axis, stands 100 hours in 85 DEG C, the environment of humidity 5% In the case of, there is 0.1~1.0% shrinking percentage in the slow-axis direction, and the elasticity modulus of 85 DEG C of the slow-axis direction is 1000MPa~3000MPa,

The slow axis of first protective film and the absorption axiss angulation of the first polarizing film are 60 ° or more and 90 ° Hereinafter,

The back side polarization plates have the second polarizing film.

[2] according to the polarization plates component recorded in [1], wherein the long side of front side polarization plates and the ratio of short side are 1.2:1 ~2:1.

[3] according to the polarization plates component recorded in [1] or [2], wherein the first polarizing film of the front side polarization plates The short side angulation of absorption axiss and the front side polarization plates is 0 ° ± 1 °.

[4] the polarization plates component recorded according to any one of [1] to [3], wherein the first polarizing film with a thickness of 15 μm with Under.

[5] the polarization plates component recorded according to any one of [1] to [4], wherein first protective film with a thickness of 10 μm~50 μm.

[6] the polarization plates component recorded according to any one of [1] to [5], wherein back side polarization plates also have reflection-type Polarization plates.

[7] a kind of liquid crystal display device, with liquid crystal cells and a pair of of the polarization plates for being configured at its two sides,

The pair of polarization plates are the polarization plates component that any one of [1] to [6] is recorded,

The first protective film, the first polarizing film, liquid crystal cells and the second polarization are sequentially laminated in the liquid crystal display device Piece.

Invention effect

According to the present invention it is possible to obtain a kind of polarization plates component, when being configured at hygrothermal environment and hot environment, warpage Measure small, polarizing film will not be damaged.

Detailed description of the invention

Fig. 1 is the schematic sectional view for illustrating a mode of polarization plates component of the invention.

Fig. 2 is the schematic diagram for illustrating the relationship of the absorption axiss of slow axis and the first polarizing film of the first protective film.

Fig. 3 is the schematic diagram of the relationship of the absorption axiss for indicating the first polarizing film and the absorption axiss of the second polarizing film.

Fig. 4 is the schematic diagram for indicating the measuring point of amount of warpage.

Specific embodiment

Polarization plates component of the invention is illustrated hereinafter, attached drawing is suitably used, however the present invention is not limited to These modes.

Polarization plates component of the invention is following polarization plates component, that is, the surface side comprising being configured at liquid crystal cells Front side polarization plates and the back side polarization plates for being configured at another surface side,

First protective film is following film, that is, has slow axis, stands 100 hours in 85 DEG C, the environment of humidity 5% In the case of, there is 0.1~1.0% shrinking percentage, and the elasticity modulus of 85 DEG C of the slow-axis direction in the slow-axis direction For 1000MPa~3000MPa,

The back side polarization plates have the second polarizing film.

In a mode, polarization plates component of the invention can have the structure illustrated in Fig. 1.For example, including configuration In a surface side of liquid crystal cells 30 front side polarization plates 10 and be configured at the back side polarization plates 20 of another surface side.At one In mode, front side polarization plates 10 are for example with the first protective film 11, the first polarizing film 12 and first adhesive phase 13.In addition, In a mode, back side polarization plates 20 have second adhesive phase 21, back side protective film 22, the second polarizing film 23, the Three adhesive phases 24, reflection type polarizer 25.These layers can have other layers according to required.

Front side polarization plates of the invention for example fit in the face of the visible side of liquid crystal cells.On the other hand, of the invention Back side polarization plates for example fit in the face with the face opposite side of visible side of liquid crystal cells.In a mode, back side Polarization plates can be to fit in liquid crystal cells with the light source in liquid crystal display device, mode adjacent such as backlight.

Although not shown in Fig. 1, such as polarization plates component, i.e. front side polarization plates 10 that can be shown in Fig. 1 And the layer other than above-mentioned layer is arranged in back side polarization plates 20.In this case, the thickness of newly-installed layer is also contained in respectively In the thickness of polarization plates.It is bonded in addition, polarizing film 12,23 is usually pressed from both sides with protective film 11,22 across adhesive layer.It is viscous for this The thickness of oxidant layer is connect, also may include in the thickness of each polarization plates.

In the present invention, the first protective film has slow axis.In a mode, for example, if by used in the first protective film Polymeric membrane stretches in one direction, then generates refractive index on the draw direction and reach maximum film surface inner shaft.In the present invention, Such face inner shaft can be set as slow axis.Draw direction is not particularly limited, can be along the length of the polymeric membrane used in protective film Edge direction stretches.

In addition, for example, can be protected according to by of the invention first in the case where stretching polymeric membrane along the long side direction The absorption axiss of the slow axis of cuticula and the first polarizing film utilize well known side in the technical field in a manner of given angle configurations Method cuts the polymeric membrane stretched, uses as the first protective film.

In another way, for example, can be according to having relative to longitudinal direction with the slow axis of given angle tilt Mode along inclined direction stretches polymeric membrane used in protective film.

In another way, for example, embodying polymeric membrane used in the first protective film using gradually biaxial stretch-formed It, can be by the film surface inner shaft generated on the direction for embodying emergent shaft, stretching in the case where the birefringence of biaxially oriented The film surface inner shaft generated on the big direction of multiplying power is as slow axis.

In the present invention, the absorption axiss angulation of the slow axis of the first protective film and the first polarizing film is 60 ° or more and 90 ° Below.

For example, as shown in Fig. 2, the first protective film 11 has slow axis 11b.Slow axis 11b and the first polarizing film (not shown) Absorption axiss 12a angulation α be 60 ° or more and 90 ° of ranges below, more preferably higher than 60 ° and the model less than 90 ° It encloses, further preferably 65 ° or more and 80 ° of ranges below.

By with such angular relationship, it is possible to reduce the warpage under hot conditions and wet heat condition.

Since the present invention is the polarization plates comprising front side polarization plates and back side polarization plates with such angular relationship Component, therefore the amount of warpage under hot conditions and wet heat condition is small, for example, in the feelings for being bonded back side polarization plates with backlight Under condition, the peeling (falling off) of backlight can be inhibited, the polarization plates component with good optical characteristics can be obtained.

In a mode, the short side institutes of the absorption axiss of the first polarizing film of front side polarization plates and front side polarization plates at Angle be 0 ° ± 1 °, more preferably 0 ° ± 0.5 °.

In a mode, the short side institutes of the absorption axiss of the second polarizing film of back side polarization plates and back side polarization plates at Angle be 90 ° ± 1 °, more preferably 90 ° ± 0.5 °.

In a mode, the short side institutes of the absorption axiss of the first polarizing film of front side polarization plates and front side polarization plates at Angle be 0 ° ± 1 °, the short side angulation of the absorption axiss of the second polarizing film of back side polarization plates and back side polarization plates It is 90 ° ± 1 °.

By with such axis relationship, such as can be as shown in figure 3, by the absorption axiss 12a of the first polarizing film 12 and the back side The absorption axiss 23a angulation of second polarizing film of lateral deviation vibration plate 20 is set as 90 ° ± 1 ° of range, can in another way To be set as 90 ° ± 0.5 ° of range.

In another way, the short side institutes of the absorption axiss of the first polarizing film of front side polarization plates and front side polarization plates at Angle be 90 ° ± 1 °, for example, 90 ° ± 0.5 °.In this case, the absorption axiss of the second polarizing film of back side polarization plates Short side angulation with back side polarization plates is 0 ° ± 1 °, is preferably 0 ° ± 0.5 ° in another way.

In a mode, the absorption axiss angulation of the absorption axiss of the first polarizing film and the second polarizing film is 90 ° ± 1 °, more preferably 90 ° ± 0.5 °.It, can also be by the suction of the absorption axiss of such first polarizing film and the second polarizing film in the present invention The substantially orthogonal state of axis is received to be referred to as polarizing film with the state configuration of Nicol crossed.

For example, by the absorption axiss of the absorption axiss of the first polarizing film and the second polarizing film with the state of Nicol crossed In the case where configuration, in a mode, the absorption axiss of the first polarizing film of front side polarization plates are short with front side polarization plates Side angulation is 0 ° ± 1 °, the short side institutes of the absorption axiss of the second polarizing film of back side polarization plates and back side polarization plates at Angle be 90 ° ± 1 °.

In addition, in some mode, by the absorption axiss of the first polarizing film with the absorption axiss of the second polarizing film with orthogonal Buddhist nun In the case where the state configuration of Cole's prism, the slow axis of the first protective film and the absorption axiss angulation of the first polarizing film are 60 ° of ranges more than and less than 90 °, more preferably 65 ° or more and 80 ° of ranges below.

According to such mode, it is believed that the various axis directions as possessed by front side polarization plates, back side polarization plates It hardly repeats, therefore can effectively disperse the convergent force that may be generated in each axis direction.As a result, for example in wet heat condition And under hot environment, being able to suppress or reduce may lateral deviation vibration plate, the warpage generated in back side polarization plates in front.

Polarization plates component of the invention is able to maintain the receipts that may be generated in lateral deviation vibration plate and back side polarization plates in front Contracting, with may stress when the contraction of these polarization plates due to the liquid crystal cells that generate in glass plate warpage balance.Such as Described in this, due to can balance keep the convergent force of each polarization plates and the warpage of glass plate well, of the invention is inclined Even if vibration plate component uses under wet heat condition and hot environment, can also be greatly reduced may cause because of the warpage of glass Display it is uneven.

For example, in the case where the absorption axiss of the second polarizing film of back side polarization plates are arranged along the long side direction, the back side The stress when contraction of lateral deviation vibration plate becomes overriding stress, may generate warpage in glass.On the other hand, if it is this The polarization plates component of invention, then due to will have the front side polarization plates of given structure to be used in combination with back side polarization plates, The degree of the power of glass side and back side same degree in front can be made to act on.

It is above-mentioned effective in the feelings that the absorption axiss of the second polarizing film of back side polarization plates are arranged along short side direction It can also be obtained under condition, however be significant in the case where the absorption axiss of the second polarizing film are arranged along the long side direction.

It should be noted that the absorption axiss of the first polarizing film of front side polarization plates are denoted as front sometimes in the present invention The absorption axiss of lateral deviation vibration plate, in addition, the absorption axiss of the second polarizing film of back side polarization plates are denoted as back side polarization plates sometimes Absorption axiss.

In a mode, the long side of front side polarization plates and the ratio of short side are 1.2:1~2:1.

By the ratio of long side and short side in such range with front side polarization plates, height can be more efficiently reduced Warpage under warm condition and wet heat condition.

In a mode, the first polarizing film of front side polarization plates with a thickness of 15 μm or less.

In a mode, the second polarizing film of back side polarization plates with a thickness of 15 μm or less.The thickness of first polarizing film Spending may be the same or different with the thickness of the second polarizing film.

Well known measurement side in the technical field can be used in the measurement of the thickness of each layer of polarization plates component of the invention Method carries out.

Herein, so-called that polarization plates are exposed under hot conditions, refer to such as by the temperature polarization plates at 70 DEG C~95 DEG C Degree at least exposes 30~60 minutes.The humidity of hot conditions is preferably 10% or less.

It should be noted that polarization plates component of the invention is exposed under hot conditions, may be produced in polarization plates In the case where raw slight warpage, for example, the first protective film, the first polarizing film and first adhesive phase may integrally be stuck up It is bent.In addition, similarly, for example, second adhesive phase, back side protective film, the second polarizing film, third adhesive phase and anti- Emitting polarization plates may integrally warpage.

Thus, back side polarization plates of the invention and front side polarization plates usually can be at least one layers of these interlayers Between do not generate splitting.

For such warpage, in the present invention, can be evaluated by measurement amount of warpage etc..For example, the amount of warpage can To be evaluated by the amount of warpage under measurement wet heat condition, can also be carried out by the amount of warpage under measurement hot conditions Evaluation.

For example, in the case where measuring the amount of warpage under wet heat condition front will be fitted at the table back side of glass panel The component of the second adhesive phase of the first adhesive phase and back side polarization plates of lateral deviation vibration plate (is sometimes referred to as layer in this specification Stack) stand 250 hours in the environment of 60 DEG C, humidity 90% after, by make back side polarization plates in lower section in a manner of layer is set Stack measures the relative altitude tilted from the horizontal plane of measurement platform.

In the present invention, wet heat condition be preferably in 40 DEG C~70 DEG C of temperature range, show 40%~90% it is wet The state of degree.

For example, the amount of warpage of the laminated body under wet heat condition is less than 1.00mm, more preferably 0.8mm or less.

It, can be in the above range with the warpage under wet heat condition using polarization plates component of the invention.In addition, due to In the above range with the warpage under wet heat condition, therefore when being packed into liquid crystal display device, it can obtain and be difficult in liquid crystal The end of display device generates the effect of light leakage.

Similarly, such as in the case where measuring the amount of warpage of the laminated body under the condition of high temperature, for by laminated body 85 DEG C, stand 250 hours in the environment of humidity 5% after polarization plates, measure the opposite with third adhesive phase of reflection type polarizer The relative altitude that the slave horizontal plane of central part tilts in the face in the face of side.

For example, the amount of warpage under the hot conditions of laminated body is less than 1.00mm, more preferably 0.8mm or less.

By showing amount of warpage in such range, such as when being packed into liquid crystal display device, it is difficult to be filled in liquid crystal display The end set generates light leakage.

[protective film]

First protective film is the film with the face of liquid crystal cells opposite side for being layered in the first polarizing film, in a mode In, it is the film with the face of first adhesive phase opposite side for being layered in the first polarizing film.In addition, as described above, at least first Protective film has slow axis.

In a mode, front side polarization plates can be in the mask with the first protective film opposite side of the first polarizing film There is the second protective film.

In addition, in a mode, back side protective film is be layered in the second polarizing film opposite with third adhesive phase The film in the face of side.First protective film and the second protective film and back side protective film can be at least two for identical film, can also To be respectively different films.

Protective film can be for by (preferably optically transparent) thermoplastic resin, such as chain polyolefin with translucency It is the polyolefin-based resins of resin (polypropylene-based resin etc.), cyclic polyolefin hydrocarbon system resin (norbornene resin etc.) etc； The cellulose-based resin of triacetyl cellulose, diacetyl cellulose etc；Polyethylene terephthalate, poly terephthalic acid The polyester based resin of butanediol ester etc；Polycarbonate-based resin；The acrylic resin of (methyl) acrylic resin etc； Polystyrene resin；Polyvinyl chloride resin；Acrylonitrile/butadiene/styrene system resin；Acrylonitrile/phenylethylene resin series； Polyvinyl acetate system resin；Polyvinylidene chloride resin；Polyamide resin；Polyacetals system resin；Noryl system Resin；Polysulfones system resin；Polyether sulfone system resin；Polyarylate system resin；Polyamidoimide system resin；Polyimides system resins etc. The film of formation.Wherein, it is preferable to use cellulose-based resin, polyolefin-based resins or acrylic resin, especially from wet-heat resisting , it is preferable to use cellulose-based resin from the viewpoint of the reduction effect of the warpage of environment.

Chain olefin as chain polyolefin-based resins, in addition to polyvinyl resin, acrylic resin etc can be enumerated Homopolymer other than, the copolymer comprising two or more chain olefins can also be enumerated.

Cyclic polyolefin hydrocarbon system resin is the general name for the resin being polymerize using cyclic olefin as polymerized unit.If enumerating ring-type The concrete example of polyolefin-based resins is then the open loop (co) polymer of cyclic olefin, the addition polymer of cyclic olefin, cyclic annular alkene Hydrocarbon is with the copolymer (representative situation is random copolymer) of the chain olefin of ethylene, propylene etc and by them with not Graft polymers and their hydride that saturated carboxylic acid or derivatives thereof has been modified etc..Wherein, preferred as cyclic olefin Using the norbornene resin for having used the orbornene-baseds monomers such as norbornene, polycyclic orbornene-based monomer.Preferred Mode in, protective film of the invention include cyclic polyolefin hydrocarbon system resin.

So-called cellulose-based resin refers to and is obtained by raw celluloses such as cotton linters, wood pulps (broad leaf tree slurry, softwood pulp) Cellulose hydroxyl hydrogen atom part or all by acetyl group, propiono and/or bytyry instead of cellulose Organic acid esters or cellulose mixed organic acid ester.For example, by the acetic acid esters of cellulose, propionic ester, butyrate and The resin of the formation such as their mixed ester.

As the preferred concrete example of acrylic resin film, can enumerate comprising methyl methacrylate system resin Film.So-called methyl methacrylate system resin is the polymer of the methyl methacrylate units comprising 50 weight % or more.First The content of base methyl acrylate units is preferably 70 weight % or more, or 100 weight %.Methyl methacrylate units Polymer for 100 weight % is imperplex obtained by methyl methacrylate is polymerized alone.

The methyl methacrylate system resin usually can be by by single official using methyl methacrylate as principal component Can monomer and polyfunctional monomer used as needed in radical polymerization initiator and chain-transferring agent used as needed Lower polymerization coexists to obtain.

As can with the monofunctional monomer of methyl methacrylate copolymer, for example, ethyl methacrylate, Butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, methacrylic acid 2- second Methyl acrylic ester other than the methyl methacrylates such as the own ester of base and 2-hydroxyethyl methacrylate；Acrylic acid first Ester, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, acrylic acid 2- ethyl hexyl The esters of acrylic acid such as ester and acrylic acid 2- hydroxy methacrylate；2- (hydroxymethyl) methyl acrylate, 3- (hydroxyethyl) third The hydroxy acrylic acids esters such as e pioic acid methyl ester, 2- (hydroxymethyl) ethyl acrylate and 2- (hydroxymethyl) butyl acrylate； The unsaturation acids such as methacrylic acid and acrylic acid；The halogenated styrenes class such as chlorostyrene and bromstyrol；Vinyltoluene and The substituted phenylethylenes class such as α-methylstyrene；The unsaturated nitriles such as acrylonitrile and methacrylonitrile；Maleic anhydride and citraconic anhydride Equal unsaturated acids anhydride；And unsaturated acyls imines such as phenyl maleimide and N-cyclohexylmaleimide etc..Such list Body can use individually, and can also be applied in combination two or more.

As can be with the polyfunctional monomer of methyl methacrylate copolymer, for example, ethylene glycol two (methyl) third Olefin(e) acid ester, diethylene glycol two (methyl) acrylate, triethylene glycol two (methyl) acrylate, tetraethylene glycol two (methyl) propylene Acid esters, nine ethylene glycol, two (methyl) acrylate and ten tetraethylene glycols (methyl) acrylate etc. are by ethylene glycol or its is oligomeric Substance obtained by two terminal hydroxyls of object are esterified with acrylic or methacrylic acid；By propylene glycol or two ends of its oligomer Substance obtained by terminal hydroxy group is esterified with acrylic or methacrylic acid；Neopentyl glycol two (methyl) acrylate, two (first of hexylene glycol Base) acrylate and butanediol two (methyl) acrylate etc. be by the hydroxyl of dihydric alcohol acrylic or methacrylic acid ester Substance obtained by change；Two terminal hydroxyls of bisphenol-A, the alkylene oxide adducts of bisphenol-A or their halogen substituents are used Substance obtained by acrylic or methacrylic acid esterification；By the polyalcohols such as trimethylolpropane and pentaerythrite acrylic acid or first Substance obtained by base acroleic acid esterification and make these terminal hydroxyl open loop addition glycidyl acrylates or methacrylic acid Substance obtained by the epoxy group of ethylene oxidic ester；Make succinic acid, adipic acid, terephthalic acid (TPA), phthalic acid, their halogen The open loops addition glycidyl acrylate such as the binary acid such as substituent and their alkylene oxide adducts or methacrylic acid Substance obtained by the epoxy group of ethylene oxidic ester；(methyl) benzyl acrylate；And biaryl compounds such as divinylbenzene etc.. Wherein, it is preferable to use ethylene glycol dimethacrylate, tetraethylene glycol dimethylacrylate and neopentyl glycol dimethyl allene Acid esters.

Methyl methacrylate system resin can be to be changed and carrying out the reaction between functional group possessed by the resin The modified methacrylic acid methyl esters system resin of property.As the reaction, for example, the carbomethoxy and 2- of methyl acrylate The carboxyl of separating methanol condensation reaction and acrylic acid and 2- (hydroxyl in the macromolecular chain of the hydroxyl of (hydroxymethyl) methyl acrylate Ylmethyl) methyl acrylate hydroxyl macromolecular chain in dehydration condensation etc..

It is also useful way that the phase difference value of protective film, which is controlled as the value suitable for liquid crystal display device,.For example, altogether Face convert in the liquid crystal display device of (IPS) mode, it is preferable to use substantially phase difference value into zero film.So-called substantial phase Difference is zero, and phase difference value is 10nm hereinafter, thickness direction phase difference when wavelength 590nm in face when referring to wavelength 590nm The absolute value of value is 10nm hereinafter, the absolute value of thickness direction phase difference value when 480~750nm of wavelength is 15nm or less.

According to the mode of liquid crystal display device, processing can be stretched and/or shunk to protective film, assigns suitable phase Potential difference value.However, in the present invention, the absorption axiss angulation of the slow axis possessed by the first protective film and the first polarizing film is In the range of given range, implement to stretch and/or shrink processing.

The thickness of protective film can be 1~30 μm or so, however consider from viewpoints such as intensity, disposition property, preferably 5~25 μm, more preferably 5~20 μm.If it is the thickness within the scope of this, then it can be subject to physical protection to polarizing film, if exposed to wet Under thermal environment and hot environment, the contraction of polarizing film can also be inhibited, keep stabilized optical characteristics.

As the shrinking percentage of the first protective film, preferably 0.1~1.0% range.The case where shrinking percentage is greater than 1.0% Under, the first protective film can not inhibit the contraction of polarizing film, and it is bad to have removing that polarization plates are generated under high temperature, high humidity environment etc. The case where situation.

Shrinking percentage use stood in 85 DEG C, the environment of humidity 5% 100 it is small in the case of measure the first protective film monomer Size changing rate obtained by be worth.

It should be noted that shrinking percentage refers to the shrinking percentage on the slow-axis direction of protective film in the present invention.For example, protection The slow-axis direction of film can also be substantially parallel with the longitudinal direction or short side direction of protective film.In addition, the slow axis of protective film is preferred It is given angle relative to flow direction (direction MD), for example, 60 °~90 °.

The elasticity modulus of the first protective film at 85 DEG C is the range of 1000~3000MPa.The case where being greater than the range Under, the first protective film can not inhibit the contraction of polarizing film, have the removing etc. that polarization plates are generated under high temperature, hot and humid environment The case where not good situation.In this specification, the elasticity modulus of the first protective film refers to the elasticity of the slow-axis direction of the first protective film Modulus.

Elasticity modulus is using the value obtained as follows, that is, in 85 DEG C, 5% environment of humidity after ten minutes by sample preheating, 85 DEG C, under 5% environment of humidity, with tensile speed progress tension test in 1mm/ minutes and calculate.

Protective film can press from both sides and fit in polarizing film across adhesive layer.As the bonding agent for forming adhesive layer, can make With water system bonding agent or active energy ray-curable bonding agent.

As water system bonding agent, the bonding agent formed by polyvinyl alcohol resin aqueous solution, two dosage form of water system can be enumerated Carbamate system emulsion adhesive etc..Wherein it is possible to suitably use the water system formed by polyvinyl alcohol resin aqueous solution Bonding agent.As polyvinyl alcohol resin, in addition to the polyvinyl acetate to the homopolymer as vinyl acetate can be used Carry out obtained by saponification process other than alcotex, can also use to vinyl acetate with can be copolymerized therewith other Obtained by the copolymer of monomer carries out polyvinyl alcohol based copolymer obtained by saponification process or is modified their hydroxylic moiety Modified polyvinylalcohol based polymer etc..Water system bonding agent may include aldehyde compound, epoxide, melamine series chemical combination The crosslinking agents such as object, methylol compound, isocyanate compound, amine compounds, multivalent metal salt.

Using water system bonding agent, preferably after being bonded polarizing film with protective film, implement to remove water It is water contained in bonding agent and is allowed to dry process.After drying process, the temperature for example at 20~45 DEG C or so can be set Spend the curing step cured.

Above-mentioned active energy ray-curable bonding agent refers to cured viscous because irradiating ultraviolet light isoreactivity energy-ray Agent is connect, for example, the bonding agent comprising polymerizable compound and Photoepolymerizationinitiater initiater, gluing comprising light reactive resin Connect agent, bonding agent comprising binder resin and photoreactivity crosslinking agent etc..As polymerizable compound, photocuring can be enumerated The photopolymerization monomer of property epoxy monomer, light-curable acrylic system monomer, photo-curable carbamate system monomer etc, From the oligomer of photopolymerization monomer.As Photoepolymerizationinitiater initiater, can enumerate comprising the active energy because of ultraviolet light etc Measure the irradiation of ray and the light of the substance of the reactive species that generate Neutral radical, radical anion, radical cation etc Polymerization initiator.It, can be with as the active energy ray-curable bonding agent comprising polymerizable compound and Photoepolymerizationinitiater initiater It is preferable to use the bonding agents comprising photo-curable epoxy monomer and light cationic polymerization initiator.

Using active energy ray-curable bonding agent, after polarizing film is bonded with protective film, according to It needs to be dried process, then carries out solidifying active energy ray-curable bonding agent by irradiating active energy beam Curing process.The light source of active energy beam is not particularly limited, however it is preferred that has the distribution that shines below wavelength 400nm Ultraviolet light, specifically, Cooper-Hewitt lamp, middle medium pressure mercury lamp, high-pressure mercury-vapor lamp, extra-high-pressure mercury vapour lamp, chemistry can be used Lamp, black light lamp, microwave-excitation mercury vapor lamp, metal halide lamp etc..

When polarizing film to be bonded with protective film, the binding face of their at least any one party can be implemented at saponification Reason, sided corona treatment, corona treatment etc..

[polarizing film]

Polarizing film be with absorb rectilinearly polarized light with the vibration plane for being parallel to its absorption axis, transmission with and absorption The polarizing film of the absorption-type of the property of the rectilinearly polarized light of orthogonal (parallel with the axis of homology) vibration plane of axis.Polarization of the invention First polarizing film used in board group part and the second polarizing film can be identical polarizing film, be also possible to respectively different polarizations Piece.For example, can be suitably using the polarizing coating for making polyvinyl alcohol resin film absorption dichroism pigment and being orientated.Polarizing film Such as it can use the process including being uniaxially stretched to polyvinyl alcohol resin film；By the way that polyvinyl alcohol resin film is used Dichroism pigment dyes and is allowed to adsorb the process of dichroism pigment；The polyvinyl alcohol resin film of dichroism pigment will be adsorbed with The process handled with boric acid aqueous solution；And the method for the process washed after the processing using boric acid aqueous solution is made It makes.

As polyvinyl alcohol resin, resin obtained by being saponified polyvinyl acetate system resin can be used.As poly- Vinyl acetate resin can be with other than it can enumerate the polyvinyl acetate as the homopolymer of vinyl acetate Enumerate the copolymer etc. of vinyl acetate with the other monomers that can be copolymerized.It can be with the other monomers of vinyl acetate copolymerization Example includes unsaturated carboxylic acid class, olefines, vinyl ethers, unsaturated sulfonic acid class and the acrylic amide with ammonium Deng.

The saponification degree of polyvinyl alcohol resin is usually 85~100mol% or so, preferably 98mol% or more.Polyethylene Alcohol system resin can also be modified, such as the polyvinyl formal being modified by aldehydes or polyvinyl alcohol contracting second also can be used Aldehyde etc..The average degree of polymerization of polyvinyl alcohol resin is usually 1000~10000 or so, and preferably 1500~5000 or so.It is poly- The average degree of polymerization of vinyl alcohol resin can be found out according to JIS K 6726.

Film obtained by such polyvinyl alcohol resin film is used by the former material film as polarizing film (polarizing coating).It will gather The method of vinyl alcohol resin film is not particularly limited, and can use well known method.The thickness of polyethenol series former material film It is not particularly limited, however in order to which the thickness of polarizing film is set as 15 μm hereinafter, it is preferable to use 5~35 μm or so of former material films. More preferably use 20 μm of former material films below.

Being uniaxially stretched for polyvinyl alcohol resin film simultaneously or can contaminated before the dyeing of dichroism pigment, with dyeing It is carried out after color.In the case where being uniaxially stretched after dyeing, this is uniaxially stretched can be before boric acid processing or in boric acid processing It carries out.Alternatively, it is also possible to be uniaxially stretched in these multiple stages.

When being uniaxially stretched, it can be stretched between the different roller of peripheral speed with uniaxial manner, heat also can be used Roller is stretched with uniaxial manner.It can be the dry type stretching stretched in an atmosphere in addition, being uniaxially stretched, be also possible to Make the wet tensile stretched in the state of polyvinyl alcohol resin membrane swelling using solvent.Stretching ratio is usually 3~8 times Left and right.

As the method for dyeing polyvinyl alcohol resin film with dichroism pigment, for example, can using by the film immersion in Method in aqueous solution containing dichroism pigment.As dichroism pigment, iodine, dichroic organic dye are used.It needs to illustrate , polyvinyl alcohol resin film preferably dyeing processing before first implement the impregnation into water.

It handles as using the dyeing of iodine, generallys use polyvinyl alcohol resin film immersion in containing iodine and potassium iodide Method in aqueous solution.The content of iodine in the aqueous solution can be in every 100 parts by weight water as 0.01~1 parts by weight or so. The content of potassium iodide can be in every 100 parts by weight water as 0.5~20 parts by weight or so.In addition, the temperature of the aqueous solution can be with It is 20~40 DEG C or so.On the other hand, it handles, is generallyd use polyethenol series as using the dyeing of dichroic organic dye Resin film is impregnated in the method in the aqueous solution containing dichroic organic dye.Aqueous solution containing dichroic organic dye can be with Contain the inorganic salts such as sodium sulphate as dyeing assistant.The content of dichroic organic dye in the aqueous solution can be every 100 weight Measuring is 1 × 10- in part water⁴~10 parts by weight or so.The temperature of the aqueous solution can be 20~80 DEG C or so.

It is handled as using the boric acid after the dyeing of dichroism pigment, generalling use will be through hyperchromatic polyethenol series tree Adipose membrane is impregnated in the method in the aqueous solution of boronic acid containing.In the case where using iodine as dichroism pigment, the water of the boronic acid containing Solution preferably comprises potassium iodide.The amount of boric acid in the aqueous solution of boronic acid containing can be in every 100 parts by weight water as 2~15 weight Part or so.The amount of potassium iodide in the aqueous solution can be in every 100 parts by weight water as 0.1~15 parts by weight or so.This is water-soluble The temperature of liquid can be 50 DEG C or more, for example, 50~85 DEG C.

Treated that polyvinyl alcohol resin film usually carries out washing process for boric acid.Washing process for example can be by will be through The polyvinyl alcohol resin film immersion of perboric acid processing carries out in water.The temperature of water in washing process is usually 5~40 DEG C or so.

Implement to be dried after washing, obtains polarizing film.Air drier can be used in drying process, far infrared adds Hot device carries out.The thickness of polarizing film is preferably 15 μm hereinafter, more preferably 10 μm or less.The thickness of polarizing film is set as 15 μm Below for polarization plates, and then be liquid crystal display device filming it is advantageous.The thickness of polarizing film is usually 4 μm or more.It needs Illustrate, the thickness of polarizing film can suitably adjust in the way of in the range for not departing from the scope of the present invention.

[first and second adhesive phase]

As the adhesive for forming first adhesive phase and second adhesive phase, can properly select known viscous Mixture, as long as have hot environment that polarization plates are exposed, hygrothermal environment or repeatedly high temperature and in the environment of low temperature not Generate the adhesive of the cementability of the degree of removing etc..

For example, first and second adhesive phase can be used to for various polarization plates being bonded with liquid crystal cells.

As the adhesive that can be used in first and second adhesive phase, for example, acrylic adhesive, Silicone-based adhesive, elastomeric adhesive etc., from the aspect of the transparency, weatherability, heat resistance, processability, particularly preferably Acrylic adhesive.

In addition, adhesive of the same race can be used in first adhesive phase and second adhesive phase and/or third adhesive phase, Also different types of adhesive can be used.

In a preferred manner, first adhesive phase and second adhesive phase are formed by acrylic adhesive.

In adhesive, as needed, tackifier, plasticizer, glass fibre, bead, gold can also be mated properly into Belong to powder, by the filler of the formation such as other inorganic powders, pigment, colorant, filler, antioxidant, ultraviolet absorbing agent, anti- The various additives such as electrostatic interference agent, silane coupling agent.

Adhesive phase is usually by forming the solution coating of adhesive on release sheet and and dry.To on release sheet Coating rolling method such as can use reversion coating, intaglio plate coating, spin-coating method, silk screen rubbing method, jetting type rubbing method, dipping Method, spray-on process etc..The method of release sheet equipped with adhesive phase by being transferred etc. is applied.First adhesive phase and second The thickness of adhesive phase is usually 3~30 μm or so, preferably 10~30 μm, more preferably 10~25 μm.In preferred mode In, by making first adhesive phase, second adhesive phase that there is such thickness, polarization plates can be inhibited to destroy, be packed into When liquid crystal display device, it can inhibit to generate light leakage in the end of liquid crystal display device.It should be noted that on can be according to making The thickness that the mode that layer thickness is given range suitably adjusts first adhesive phase, second adhesive phase is stated, can be made First adhesive phase, the thickness of second adhesive phase are identical, can also be allowed to as different thickness.

Storage modulus when first adhesive phase, 80 DEG C of second adhesive phase is preferably 0.015MPa or more, more preferably For 0.03MPa or more.If the storage modulus of adhesive phase is less than 0.015MPa, there may be first adhesive phases, second The cohesion of adhesive phase destroys, if cohesion destroys significantly, not only causes adverse effect to the appearance of polarization plates, is being packed into liquid When crystal device, also light leakage can be generated in the end of liquid crystal display device, adverse effect is caused to display.First adhesive Storage modulus when layer, 80 DEG C of second adhesive phase is preferably 1.1MPa hereinafter, more preferably 0.9MPa or less.If 80 DEG C When adhesive phase storage modulus be greater than 1.1MPa, then for first adhesive phase, second adhesive phase and glass or panel For resistance to heat durability be deteriorated, be easy to generate bubble in interlayer.

Can before first adhesive phase, second adhesive phase are fitted in other components, in order to protect its surface and Spacer is set.For example, implementing utilization using to the film formed by the transparent resin of polyethylene terephthalate etc The film of the processing of the release agents such as silicone-based.

[reflection type polarizer]

Reflection type polarizer is also referred to as brightness enhancement film, is separated into the emergent light from light source (backlight) using having Penetrate the polarization light conversion element of the function of polarised light and polarization by reflection light or scattering polarization light.By as described above by reflection-type Polarization plates and polarizing film are configured with given relationship, be can use the return light as polarization by reflection light or scattering polarization light, are mentioned The outgoing efficiency for the rectilinearly polarized light that height is projected from polarizing film.Such as reflection type polarizer and third adhesive phase are contacted into stratum It is folded.

Reflection type polarizer for example can be anisotropic emission polarizing film.An example of anisotropic emission polarizing film is The multiple film of anisotropy of the rectilinearly polarized light of a direction of vibration, the rectilinearly polarized light for reflecting another direction of vibration is penetrated, Its concrete example is the DBEF (Japanese Unexamined Patent Publication 4-268505 bulletin etc.) of 3M.Such reflection type polarizer is to by reflecting Reflection type polarizer made of the multi-layer laminate that different at least 2 layer films of rate anisotropy are constituted is stretched.Therefore, this Kind of reflection type polarizer has at least 2 layer films, and stretched at least 2 layer films are different thin of refractive anisotrop Film.

Another example of anisotropic emission polarizing film is the complex of cholesteric liquid crystal layers Yu the plate of λ/4, and concrete example is day The PCF (Japanese Unexamined Patent Publication 11-231130 bulletin etc.) of eastern electrician's Co. Ltd. system.Anisotropic emission polarizing film it is another Example is reflecting grating polarizing film, and concrete example is that can also project polarization by reflection in visible light region after implementing microfabrication to metal The metal lattice reflecting polarizer (No. 6288840 specifications of U.S. Patent No. etc.) of light, metal particle is added to it is polymer-based In matter and stretch obtained by film (Japanese Unexamined Patent Publication 8-184701 bulletin).

In the face with first adhesive phase opposite side of reflection type polarizer, hard conating, antiglare layer, light can be set and expand Dissipate the optical layer of layer, phase separation layer of phase difference value with 1/4 wavelength etc.Using the formation of optical layer, can be improved with The adaptation of backlight adhesive tape, the uniformity for showing image.The thickness of reflection type polarizer can be 5~100 μm or so, however From the viewpoint of the filming of polarization plates, preferably 10~40 μm, more preferably 10~30 μm.

In polarization plates component of the invention, can the surface of third adhesive phase side to reflection type polarizer implement surface It is activated.The surface activation process can be carried out before being bonded of reflection type polarizer and third adhesive phase.Thus, it is possible to Obtain be difficult to generate under damp and hot and hot environment the removing between third adhesive phase and reflection type polarizer, it is damp and hot durable Property and the excellent polarization plates of high temperature durability.

Surface activation process can be the hydrophilicity-imparting treatment on surface, and either dry process or wet processed is ok. As dry process, for example, the discharge treatment of sided corona treatment, corona treatment, glow discharge process etc；Fire Flame processing；Ozone treatment；UV ozone treatment；Ionization activity Irradiation of UV treatment, electron beam treatment etc etc..As Wet processed, such as may be exemplified out the ultrasonication for having used the solvent of water, acetone etc, alkali process, anchor painting processing etc.. These processing can be carried out individually, can also be carried out in combination of two or more.

Wherein, it is examined from the viewpoint of the removing inhibitory effect of the reflection type polarizer under hygrothermal environment and the productivity of polarization plates Consider, surface activation process is preferably sided corona treatment and/or corona treatment.According to these surface activation process, even if anti- The thickness of emitting polarization plates is thin, is, for example, in 30 μm of situations below, and the third that can also be effectively inhibited under hygrothermal environment is viscous Removing between mixture layer and reflection type polarizer.It should be noted that can brightness reflective to third adhesive phase it is inclined Also implement surface activation process simultaneously in the surface of vibration plate side.

[third adhesive phase]

Third adhesive phase is the layer being located between the second polarizing film and reflection type polarizer.Third adhesive phase is in allusion quotation Polarizing film is directly laminated in a manner of contacting the second polarizing film with third adhesive phase in the case where type.Third adhesive Layer can be formed by material identical with first adhesive phase or second adhesive phase.Specifically, third adhesive phase can be with Resin to acrylic acid series, rubber series, carbamate system, ester system, silicone-based, polyvingl ether system etc is as principal component Adhesive composition constitute.Wherein, it is suitably for making with the excellent acrylic resin such as the transparency, weatherability, heat resistance For the adhesive composition of basic polymer.Adhesive composition can be active energy ray curable, heat curing type.Third is viscous Mixture layer can be formed from the same material respectively with first adhesive phase or second adhesive phase, can also be respectively by different Material is formed.

Third adhesive phase is preferably the storage modulus that 0.15~1.2MPa is shown in 23~80 DEG C of temperature range Material.Thus, it is possible to inhibit to be easy to the contraction along with polarizing film under high temperature and hygrothermal environment and the change in size that generates, Improve the durability of polarization plates.In addition, by liquid crystal display device (such as the middle-size and small-size mobile terminal equipped with polarization plates Liquid crystal display device) when being placed under high temperature and hygrothermal environment, the movement of polarization plates can also be inhibited, therefore liquid crystal can be improved The reliability of display device.

So-called " storage modulus of 0.15~1.2MPa is shown in 23~80 DEG C of temperature range ", refers in the range Arbitrary temp under, storage modulus is all the value in above range.Therefore, though individually record 23 DEG C and 80 DEG C when energy storage Modulus, each storage modulus are also contained in above range.

Storage modulus is usually gradually decreased as temperature increases, so if storage modulus at 23 DEG C and 80 DEG C into Enter above range, then can be considered as the range at a temperature of show storage modulus in above range.The storage of adhesive phase Such REOMETRIC company shown in commercially available determination of viscoelasticity device, such as aftermentioned embodiment can be used in energy modulus The determination of viscoelasticity device " DYNAMIC ANALYZER RDA II " of system is measured.

As the method for storage modulus to be adjusted to above range, can enumerate to comprising base polymer and crosslinking Added again in the adhesive composition of agent oligomer, specifically urethane acrylate system oligomer and work is made Property energy ray-curable adhesive composition (preferably ultraviolet-curing adhesive composition).More preferably irradiate active energy It measures ray and solidifies adhesive phase moderately.

The thickness of third adhesive phase can be 30 μm or less.Preferably 25 μm hereinafter, particularly preferably 20 μm hereinafter, outstanding It is preferably 15 μm or less.By making the thickness of third adhesive phase be in such range, good processability can kept While, inhibit the change in size of polarization plates.It should be noted that can be according to the range for keeping above-mentioned layer thickness given Mode suitably adjusts the thickness of third adhesive phase.

[manufacturing methods of front side polarization plates]

Front side polarization plates of the invention are for example including the one side folder in the first polarizing film across adhesive layer fitting first Protective film.In this case, so that angle formed by the absorption axiss of the slow axis of the first protective film and the first polarizing film is given angle Mode be bonded.

In addition, for example including the face paste conjunction first adhesive phase with the first protective film opposite side in the first polarizing film.

In a mode, including pressing from both sides in the first polarizing film and the face of the first protective film opposite side across adhesive layer It is bonded the second protective film, and including the face paste conjunction first adhesive phase with the first polarizing film opposite side in the second protective film. It should be noted that can also temporarily paste spacer in the outer surface of first adhesive phase.

As long as front side polarization plates of the invention are so that the slow axis of the first protective film and the first polarizing film as described above, Angle formed by absorption axiss is that the mode of given angle is bonded, then can use well known method production in the technical field.

[manufacturing methods of back side polarization plates]

In a mode, by the reflection type polarizer for being laminated in the second polarizing film top laminate third adhesive phase Process and make.

In addition, back side polarization plates of the invention for example, pasted in the one side folder of the second polarizing film across adhesive layer Close that back side protective film, overleaf side protective film with the surface layer of the second polarizing film opposite side folds second adhesive phase, the Two polarizing films with the face paste of back side protective film opposite side close third adhesive phase, third adhesive phase with second partially The surface layer for piece opposite side of shaking folds reflection type polarizer.By passing through these processes, the back side of an available embodiment Lateral deviation vibration plate.It should be noted that spacer can be temporarily pasted in the outer surface of second adhesive phase, it can also be viscous to third The binding face implementation surface activation process with reflection type polarizer of mixture layer.

The method that reflection type polarizer is bonded on third adhesive phase can be individual fitting method, be also possible to as Japan The compound fitting method of piece/volume as being recorded in special open 2004-262071 bulletin.In addition, can with long size produce, It and is also useful method using roll-to-roll applying method in the case that required quantity is big.

The manufacturing method of back side polarization plates of the invention can use well known method in the technical field as described above, Production.

[liquid crystal display device]

Polarization plates component of the invention can be preferably applied in liquid crystal display device.Liquid crystal display device includes liquid crystal list The component of member and the polarization plates of the invention for fitting in its surface.

Such as it can press from both sides and be bonded front side polarization plates to liquid crystal cells across first adhesive phase.Lateral deviation before of the invention Vibration plate is used by the polarization plates as the visible side for being configured at liquid crystal cells.For example, liquid crystal display device is so that the first protective film Have front side polarization plates for outermost mode.

In addition, back side polarization plates of the invention are used by the polarization plates as the backlight side for being configured at liquid crystal cells. Such as it can press from both sides and carry out fitting of the back side polarization plates to liquid crystal cells across second adhesive phase.

The driving method of liquid crystal cells can be known any way, however preferably IPS mode.This is used The wet heat durability of the liquid crystal display device of the polarization plates of invention is excellent.

Each polarization plates are fitted in organic electroluminescent across first adhesive phase, second adhesive phase by pressing from both sides by the present invention Display, available organic electroluminescence display device and method of manufacturing same.

[embodiment]

Hereinafter, provide embodiment and the present invention is further elaborated with, however the present invention is not limited by these examples. The % for indicating content or usage amount in example and part are exactly weight basis as long as no particularly pointing out.

It should be noted that according to the thickness of following methods measurement membrane.

(1) measurement of film thickness

It is measured using the digital micrometer " MH-15M " of Nikon corporation.

[manufacture of polarizing film]

Thick 20 μm of polyvinyl alcohol film (99.9 moles of average degree of polymerization about 2400, saponification degree % or more) is drawn using dry type Stretch that be uniaxially stretched be about 5 times, then after keeping tense situation unchangeably to impregnate 1 minute in 60 DEG C of pure water, at 28 DEG C in iodine/iodine Change and is impregnated 60 seconds in the aqueous solution that potassium/water weight ratio is 0.05/5/100.Thereafter, at 72 DEG C in potassium iodide/boric acid/water weight It is impregnated 300 seconds in the aqueous solution that amount ratio is 8.5/8.5/100.Next after cleaning 20 seconds with 26 DEG C of pure water, in 65 DEG C of dryings, Obtain 7 μm of thickness of the polarizing film for being adsorbed with iodine on polyvinyl alcohol film and being orientated.

In the case where the first polarizing film as front side polarization plates uses, so that the absorption axiss of the first polarizing film are with before The mode that the short side angulation of surface side polarization plates is 0 ° ± 0.5 °, produces the first polarizing film.

On the other hand, in the case where the second polarizing film as back side polarization plates uses, so that the second polarizing film The short side angulation of absorption axiss and back side polarization plates is that 90 ° ± 0.5 ° of mode produces the second polarizing film.

Use film below as protective film.

[protective film -1]

The tri acetyl cellulose membrane of Konica Minolta Co. Ltd. system manufactured using oblique extension；KC4UGR-HC (thickness direction phase difference=75nm in face when thick 44 μm, wavelength 590nm when phase difference value=106nm, wavelength 590nm, Rth (590)/Re (590)=0.71, Re (450)/Re (550)=0.96, Re (630)/Re (550)=1.02 optical film.) With tilting 45 ° of slow axis relative to MD (flow direction), shrinking percentage is 0.2% on slow-axis direction, slow axis side at 85 DEG C To elasticity modulus be 2500MPa.

[protective film -2]

The cycloolefin resin film (Japanese ZEON Co. Ltd. system) with a thickness of 13 μm is used.In face when wavelength 590nm Postpone (Re (590))=0.8nm, wavelength 590nm when thickness direction retardation (Rth (590))=3.4nm, wavelength 483nm when Thickness direction retardation (Rth (755))=2.8nm when thickness direction retardation (Rth (483))=3.5nm, wavelength 755nm.

[protective film -3]

Tri acetyl cellulose membrane (the phase in face when thick 20 μm, wavelength 590nm of Konica Minolta Co. Ltd. system Thickness direction phase difference value=1.3nm when difference=1.2nm, wavelength 590nm).

[protective film -4]

Stretched acrylic resin film；Phase difference value=3nm, wavelength in face when thick 40 μm, wavelength 590nm Thickness direction phase difference=- 3nm optical film when 590nm.With the slow axis substantially parallel with MD (flow direction), shrink Rate is 0.1% on slow-axis direction, and the elasticity modulus of slow-axis direction at 85 DEG C is 1800MPa.

[reflection type polarizer]

Brightness enhancement film (the 3M system, trade name Advanced Polarized Film, Version with a thickness of 26 μm are used 3)。

[preparation of water system bonding agent]

Relative to 100 parts of water, dissolve 3 parts of carboxy-modified polyvinyl alcohol (KL-318 of Co., Ltd. Kuraray), to It is added in the aqueous solution and (firmly changes Chemtex Co. Ltd. system as the daiamid epoxy system additive of soluble epoxide compound Sumirez Resin (registered trademark) 650 (30), solid component concentration 30% aqueous solution) 1.5 parts, water system bonding is made Agent.

[adhesive phase -1]

Used implemented demoulding processing with a thickness of 38 μm of polyethylene terephthalate film (stripping film) Demoulding process face is laminated with the commercially available adhesive sheet of thick 20 μm of acrylic adhesive layer.The storage modulus of the adhesive phase It is 0.05MPa at 23 DEG C, is 0.04MPa at 80 DEG C.

[adhesive phase -2]

Urethane acrylate oligomer and isocyanide will be added into the copolymer of butyl acrylate and acrylic acid The organic solvent solution of acid esters system crosslinking agent, by die coating machine by make it is dry after with a thickness of 5 μm in the way of, be coated on and implemented The demoulding process face for demoulding 38 μm of thickness of polyethylene terephthalate film (stripping film) of processing, is dried, obtains layer It is laminated with the adhesive sheet of adhesive phase.The storage modulus of the adhesive phase is 0.40MPa at 23 DEG C, is 0.18MPa at 80 DEG C.

(embodiment 1)

[production of front side polarization plates -1]

In the one side of the first polarizing film, the protective film -1 as the first protective film is laminated across water system bonding agent in folder.? The face with the face opposite side for being laminated with the first protective film of first polarizing film is similarly pressed from both sides across water system bonding agent, and stacking is made For the protective film -2 of the second protective film.

It is 5 minutes dry at 80 DEG C after stacking, thus the first protective film, the first polarizing film and the second protective film are bonded.

In the face with the face opposite side for being fitted with the first polarizing film of the second protective film, fitting is laminated on stripping film First adhesive phase.

In embodiment 1, so that the side that the absorption axiss angulation of the slow axis of the first protective film and the first polarizing film is 60 ° Formula fitting.

[production of back side polarization plates -1]

In the one side of the second polarizing film, the protective film -3 as back side protective film is laminated across water system bonding agent in folder. It is 5 minutes dry at 80 DEG C after stacking, thus back side protective film is bonded with the second polarizing film.Second polarizing film with to The face of the binding face opposite side of back side protective film is bonded the adhesive as third adhesive phase being laminated on stripping film Layer -2.

The overleaf face with the binding face opposite side to the second polarizing film of side protective film, fitting are laminated on stripping film The adhesive phase -1 as second adhesive phase.

In addition, being bonded in the mode for keeping the absorption axis direction of the second polarizing film parallel with the longitudinal direction of protective film.

It produces as described and is sequentially laminated with second adhesive phase, back side protective film, the second polarizing film and third The polarization plate front body A-1 of adhesive phase.

Peel the stripping film on the third adhesive phase of above-mentioned polarization plate front body.The third bonding of plate front body A-1 will be polarized Oxidant layer is bonded with brightness enhancement film, obtains being sequentially laminated with second adhesive phase, back side protective film, the second polarizing film, third bonding The back side polarization plates of oxidant layer, reflection type polarizer (brightness enhancement film).

The relation table of the various shaft angle degree of so shown obtained polarization plates is shown in Table 1.

For embodiment 2~6 and the Comparative Examples 1 to 5, polarization plates also are produced using method similar to the above.It needs Bright, relationship of shaft angle degree of polarization plates etc. is as shown in table 1 and table 2.

(embodiment 7)

It uses " front side polarization plates -2 " as front side polarization plates, uses " back side polarization plates -1 " as back side Polarization plates.

[production of front side polarization plates -2]:

In the one side of the first polarizing film, the protective film -2 as the second protective film is laminated across water system bonding agent in folder.Layer Poststack, it is 5 minutes dry at 80 DEG C, thus the second protective film is bonded with the first polarizing film.First polarizing film be laminated with The protective film-as the first protective film is laminated across UV curability bonding agent in the face of the face opposite side of second protective film, folder 4.After stacking, ultraviolet light is irradiated, is thus bonded the first protective film with the first polarizing film.

In embodiment 7, so that the absorption axiss angulation of the slow axis of the first protective film and the first polarizing film is 60 ° Mode is bonded.

For embodiment 8~12 and comparative example 6~10, polarization plates also are made using method similarly to Example 7.It needs Illustrate, relationship of shaft angle degree of polarization plates etc. is as shown in table 3 and table 4.

Evaluation of physical property about polarization plates

The evaluation of resulting various polarization plates has been carried out according to measuring method below.

(high temperature/high damp heat test)

The production of test film

Front side polarization plates, which are cut, (has the absorption of polarization plates in short side direction for long side 155mm × short side 96mm Axis).

The stripping film in the first adhesive phase of the front side polarization plates cut out is peeled, is pressed from both sides across first adhesive phase, It fits in a thickness of 0.4mm, having a size of long side 160mm × short side 102mm glass plate.Glass plate be fitted with front side The face of the face opposite side of polarization plates, presss from both sides the adhesive phase (second adhesive phase) across acrylic acid series, and fitting cuts as long side The back side polarization plates of 155mm × short side 96mm (there are the absorption axiss of polarization plates in longitudinal direction).

(warpage under hot environment)

In with front side polarization plates/glass plate/back side polarization plates composition laminated body, so that front side polarizes Plate is the mode of upside, and above-mentioned laminated body is stood 250 hours in the environment of 85 DEG C, humidity 5%.It is taken out from hot environment Sample, on the measurement platform of two-dimensional measurement instrument (Co., Ltd.'s Nikon system, NEXIV (registered trademark) MR-12072), so that preceding Surface side polarization plates are that the mode of upside places laminated body.

Then, make focus alignment measurement platform surface, at this on the basis of, make respectively focus alignment have front side polarization It 25 points on the face of the laminated body of plate/glass plate/back side polarization plates composition, determines relative to the focus as benchmark Highly.Using the difference of the maxima and minima of the height in 25 points of measuring point as amount of warpage.In Fig. 4, there is shown expression is stuck up The schematic diagram of the measuring point of song amount.40 be " measuring point ", and 50 be polarization plates, and 60 be glass plate.

25 " measuring point " are the points in the inside region of the end 7mm apart from polarization plates, are about 20mm with short side direction Interval, longitudinal direction are about the configuration of the interval 35mm.

Determined as shown below.It the results are shown in table 1 (embodiment) and table 2 (comparative example).In addition, will implement The result of example 7 etc. is shown in table 3 (embodiment), and the result of comparative example 6 etc. is shown in table 4 (comparative example).It needs Illustrate, in embodiment, tilting, the removing of film is not observed in arbitrary sample.

< determines >

The situation that the amount of warpage for the glass sample being statically placed under hot environment is 0.8mm or less is set as "○".

The case where amount of warpage for the glass sample being statically placed under hot environment is greater than 0.8mm is set as "×".

(warpage under resistance to wet environment)

In with back side polarization plates/glass/front side polarization plates composition laminated body, so that front side polarization plates For the mode of upside, 250 hours are stood in the environment of 60 DEG C, humidity 90%.By laminated body so that front side polarization plates are upper The mode of side is placed on the measurement platform of two-dimensional measurement instrument (Co., Ltd.'s Nikon system, NEXIV (registered trademark) MR-12072). It is determined identically as the test in hot environment.

Determined as shown below.It the results are shown in table 1 (embodiment) and table 2 (comparative example).It needs to illustrate , in embodiment, tilting, the removing of film no matter are all not observed in which sample.

< determines >

The situation that the amount of warpage for the glass sample being statically placed under hygrothermal environment is 0.8mm or less is set as " ◎ ".

The case where amount of warpage for the glass sample being statically placed under hygrothermal environment is less than 1.0mm is set as "○".

The situation that the amount of warpage for the glass sample being statically placed under hygrothermal environment is 1.0mm or more is set as "×".

[table 1]

[table 2]

[table 3]

[table 4]

According to such as a result, polarization plates component of the invention can obtain slim polarization plates component.In addition, even if inclined Vibration plate is exposed under hot conditions, under hygrothermal environment in the case where, the warpage for having the laminated body of polarization plates can also be inhibited.

As described, it is believed that since polarization plates component of the invention is in being configured at hygrothermal environment and hot environment When amount of warpage it is small, therefore there is no fall off from the removing of touch screen, backlight unit.In addition, even if being exposed to high temperature/wet When under thermal environment, it can also facilitate the reduction of the display unevenness generated by warpage.

Industrial availability

According to the present invention, such as the polarization plates component for the warpage for inhibiting polarizing film and reflection type polarizer can be provided.

The explanation of symbol

10 front side polarization plates, 11 first protective films, 12 first polarizing films, 13 first adhesive phases, 20 back sides polarization Plate, 21 second adhesive phases, 22 back side protective films, 23 second polarizing films, 24 third adhesive phases, 25 reflection type polarizers, 30 liquid crystal cells, 40 measuring points, 50 polarization plates, 60 glass plates.

Claims

1. a kind of polarization plates component is the front side polarization plates comprising being configured at a surface side of liquid crystal cells and is configured at another The polarization plates component of the back side polarization plates of surface side,

The front side polarization plates have the first protective film and the first polarizing film, from the side far from liquid crystal cells, successively layer First protective film, first polarizing film are folded,

First protective film is following film, that is, the case where having slow axis, stand 100 hours in 85 DEG C, the environment of humidity 5% Under, there is 0.1%~1.0% shrinking percentage in the slow-axis direction, and the elasticity modulus of 85 DEG C of the slow-axis direction is 1000MPa~3000MPa,

The absorption axiss angulation of the slow axis of first protective film and the first polarizing film be 60 ° or more and 90 ° hereinafter,

The back side polarization plates have the second polarizing film.

2. polarization plates component according to claim 1, wherein

The long side of front side polarization plates and the ratio of short side are 1.2:1~2:1.

3. polarization plates component according to claim 1 or 2, wherein

The absorption axiss of first polarizing film of the front side polarization plates and the short side angulation of the front side polarization plates are 0°±1°。

4. polarization plates component according to any one of claim 1 to 3, wherein

First polarizing film with a thickness of 15 μm or less.

5. polarization plates component according to any one of claim 1 to 4, wherein

First protective film with a thickness of 10 μm~50 μm.

6. polarization plates component according to any one of claim 1 to 5, wherein

Back side polarization plates also have reflection type polarizer.

7. a kind of liquid crystal display device,

Its with liquid crystal cells and a pair of of the polarization plates for being configured at its two sides,

The pair of polarization plates are polarization plates component described in any one of claims 1 to 6,

The first protective film, the first polarizing film, liquid crystal cells and the second polarizing film are sequentially laminated in the liquid crystal display device.