WO2020111236A1 - Panneau à cristaux liquides à fonction de détection tactile, dispositif d'affichage à cristaux liquides et film polarisant à couche adhésive - Google Patents

Panneau à cristaux liquides à fonction de détection tactile, dispositif d'affichage à cristaux liquides et film polarisant à couche adhésive Download PDF

Info

Publication number
WO2020111236A1
WO2020111236A1 PCT/JP2019/046798 JP2019046798W WO2020111236A1 WO 2020111236 A1 WO2020111236 A1 WO 2020111236A1 JP 2019046798 W JP2019046798 W JP 2019046798W WO 2020111236 A1 WO2020111236 A1 WO 2020111236A1
Authority
WO
WIPO (PCT)
Prior art keywords
group
adhesive layer
meth
liquid crystal
sensitive adhesive
Prior art date
Application number
PCT/JP2019/046798
Other languages
English (en)
Japanese (ja)
Inventor
智之 木村
康隆 石原
翔 寳田
昌邦 藤田
雄祐 外山
聡司 三田
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019214299A external-priority patent/JP6748279B2/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980067298.9A priority Critical patent/CN112888994A/zh
Priority to KR1020217011177A priority patent/KR20210095853A/ko
Publication of WO2020111236A1 publication Critical patent/WO2020111236A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • 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
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the present invention relates to a liquid crystal panel and a liquid crystal display device with a touch sensing function.
  • the liquid crystal display device with a touch sensing function of the present invention can be used as various input display devices such as mobile devices.
  • the present invention also relates to a polarizing film with an adhesive layer.
  • the pressure-sensitive adhesive layer-attached polarizing film of the present invention can be applied to, for example, a liquid crystal panel with a touch sensing function and a liquid crystal display device.
  • liquid crystal display devices have polarizing films attached to both sides of a liquid crystal cell via adhesive layers due to the image forming method.
  • a liquid crystal display device having a touch panel mounted on its display screen has been put into practical use.
  • the touch panel there are various types such as a capacitance type, a resistance film type, an optical type, an ultrasonic type and an electromagnetic induction type, but the capacitance type has come to be widely used.
  • a liquid crystal display device with a touch sensing function which has a built-in electrostatic capacity sensor as a touch sensor unit, has been used.
  • the release film is peeled from the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film.
  • Static electricity is generated by peeling.
  • the static electricity generated in this way affects the alignment of the liquid crystal layer inside the liquid crystal display device and causes defects.
  • the generation of static electricity can be suppressed by, for example, forming an antistatic layer on the outer surface of the polarizing film.
  • the electrostatic capacitance sensor in the liquid crystal display device with a touch sensing function detects a weak electrostatic capacitance formed by the transparent electrode pattern and the finger when the user's finger approaches the surface thereof.
  • a conductive layer such as an antistatic layer is provided between the transparent electrode pattern and the user's finger, the electric field between the drive electrode and the sensor electrode is disturbed and the sensor electrode capacitance becomes unstable, resulting in touch panel sensitivity. Will decrease and cause malfunction.
  • it is required to suppress the generation of static electricity and the malfunction of the capacitance sensor.
  • the surface resistance value is 1.0 ⁇ 10 9 to 1.0 ⁇ 10 11 ⁇ / ⁇ . It has been proposed to dispose a polarizing film having an antistatic layer on the viewing side of the liquid crystal layer (Patent Document 1).
  • Patent Document 2 a pressure-sensitive adhesive for an optical film having an antistatic function has been proposed for the purpose of preventing unevenness of a liquid crystal panel due to static electricity and adhesion of foreign matter.
  • the pressure-sensitive adhesive layer containing an ionic compound is more effective in suppressing static electricity generation and preventing static electricity unevenness than the antistatic layer provided on the polarizing film.
  • the antistatic function of the pressure-sensitive adhesive layer containing the ionic compound deteriorates with time.
  • the ionic compound in the pressure-sensitive adhesive layer may segregate at the interface with the optical film (polarizing film) or migrate into the optical film (polarizing film). It was found that the surface resistance value of the pressure-sensitive adhesive layer was large and the antistatic function was remarkably lowered. It has been found that such a decrease in the antistatic function of the adhesive layer causes static electricity unevenness and malfunction of the liquid crystal display device with a touch sensing function.
  • the adhesive layer-attached polarizing film when a transparent protective film is provided only on one side of the polarizer, and a pressure-sensitive adhesive layer is provided on the other side without a transparent protective film, the adhesive layer is provided. There is. Since the one-sided protective polarizing film with the pressure-sensitive adhesive layer has the transparent protective film only on one side, the polarizing film can be made thinner than the case where the transparent protective film is provided on both sides, and the cost for one transparent protective film is reduced. It is possible.
  • the pressure-sensitive adhesive protective film with a pressure-sensitive adhesive layer in the case of adding an ionic compound to the pressure-sensitive adhesive layer to impart an antistatic function, the influence of the ionic compound in the pressure-sensitive adhesive layer on the polarizer.
  • the polarizer is deteriorated with time and the optical characteristics are largely deteriorated after the humidification test.
  • Patent Document 2 a stable antistatic function can be satisfied in a humid environment, but in Patent Document 2 as well, in the case of using the pressure-sensitive adhesive layer-attached one-sided protective polarizing film, Further improvement of the antistatic function of the pressure-sensitive adhesive layer is required.
  • the present invention provides a touch sensing function in which a transparent protective film having a transparent protective film only on one side of a polarizer is attached to the viewer side of a liquid crystal cell with a built-in touch sensing function by an adhesive layer containing an ionic compound.
  • An object of the present invention is to provide a liquid crystal panel with a touch sensing function that can satisfy a stable antistatic function even in a humidified environment even in a liquid crystal panel with a touch panel.
  • Another object of the present invention is to provide a liquid crystal display device using the liquid crystal panel. Further, the present invention aims to provide a polarizing film with an adhesive layer, which can be applied to the liquid crystal panel with a touch sensing function.
  • the present inventors have found that the above-mentioned problems can be solved by the liquid crystal panel with a touch sensing function described below, and have completed the present invention.
  • the present invention is A liquid crystal cell with a touch sensing function, which has a liquid crystal layer and a touch sensor section, A first polarizing film arranged on the viewer side of the liquid crystal cell and a second polarizing film arranged on the opposite side of the viewer side; and A liquid crystal panel with a built-in touch sensing function, comprising a first adhesive layer disposed between the first polarizing film and the liquid crystal cell,
  • the first polarizing film has a polarizer, a transparent protective film only on one surface of the polarizer, and a transparent layer on the other surface of the polarizer, and the first polarizing film has the transparent layer interposed therebetween.
  • the first pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
  • the first pressure-sensitive adhesive layer has a surface resistance variation ratio (b/a) ⁇ 10, (However, the a is the first polarized light with an adhesive layer in a state in which the first adhesive layer is provided on the transparent layer of the first polarizing film, and the separator is provided on the first adhesive layer.
  • the surface resistance value of the first pressure-sensitive adhesive layer when the separator was peeled off immediately after producing the film, the b was the first polarizing film with the pressure-sensitive adhesive layer for 250 hours in a humidified environment of 60° C./95% RH.
  • Liquid crystal panel with a built-in touch sensing function each of which satisfies a surface resistance value of the first adhesive layer when the separator is peeled off after being charged and further dried at 40° C. for 1 hour, Regarding
  • the transparent layer is directly formed on the polarizer.
  • the thickness of the transparent layer is preferably 10 ⁇ m or less.
  • a cured product of a forming material containing a urethane prepolymer which is a reaction product of an isocyanate compound and a polyhydric alcohol can be used as the transparent layer.
  • the isocyanate compound it is preferable to use at least one selected from tolylene diisocyanate and diphenylmethane diisocyanate.
  • the transparent layer may contain an epoxy resin.
  • X is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group, and a carboxyl group.
  • R 1 and R 2 are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent.
  • R 1 and R 2 may be linked to each other to form a ring
  • a polymer obtained by polymerizing and A resin composition comprising (b) an epoxy resin, A polymer in which the content ratio of the polymer (a) to the epoxy resin (b) is 95:5 to 60:40 or 40:60 to 1:99 by weight can be used.
  • the functional group represented by X in the general formula (1) is General formula (2): ZY- (wherein Z is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde. Group and a functional group containing at least one reactive group selected from the group consisting of a carboxyl group, and Y represents an organic group).
  • the (meth)acrylic polymer (A) preferably contains an alkyl (meth)acrylate (a1) and an amide group-containing monomer (a2) as monomer units.
  • the amide group-containing monomer (a2) is preferably an N-vinyl group-containing lactam monomer.
  • the amide group-containing monomer (a2) is preferably contained as a monomer unit in the (meth)acrylic polymer (A) in an amount of 0.1% by weight or more.
  • the ionic compound (B) is an alkali metal salt, and the surface resistance value of the first pressure-sensitive adhesive layer according to the a is 1 ⁇ 10 10 to 1 ⁇ 10 12 ⁇ / ⁇ is preferable. Further, the ionic compound (B) is an organic cation-anion salt, and the surface resistance value of the first pressure-sensitive adhesive layer according to the above a is 1 ⁇ 10 8 to 1 ⁇ 10 10 ⁇ / ⁇ . preferable.
  • the ionic compound (B) is contained in an amount of 0.01 part by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A).
  • a conductive layer can be provided between the transparent layer and the first adhesive layer.
  • the liquid crystal panel with a built-in touch sensing function is preferably applied when the touch sensor unit and the first adhesive layer are in direct contact with each other.
  • the present invention also relates to a liquid crystal display device having the liquid crystal panel with a built-in touch sensing function.
  • the present invention has a polarizer, a transparent protective film only on one surface of the polarizer, and a transparent layer on the other surface of the polarizer, and an adhesive layer is provided via the transparent layer.
  • a polarizing film with an adhesive layer The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
  • the first pressure-sensitive adhesive layer has a surface resistance variation ratio (b/a) ⁇ 10, (However, the a is the surface of the pressure-sensitive adhesive layer when the separator is peeled off immediately after producing the pressure-sensitive adhesive layer-attached polarizing film in which the separator is provided in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer.
  • the b is the pressure-sensitive adhesive layer-attached polarizing film in the state where the separator is provided, put in a humidified environment of 60° C./95% RH for 250 hours, and further dried at 40° C. for 1 hour. And a pressure-sensitive adhesive layer having a surface resistance value when the separator is peeled off.
  • the same preferable embodiment as the polarizing film with an adhesive layer used for the liquid crystal panel with a built-in touch sensing function can be applied to the polarizing film with an adhesive layer.
  • the panel with a built-in touch sensing function of the present invention has a liquid crystal cell containing a touch sensor unit, and a first adhesive layer provided between the liquid crystal cell and a first polarizing film arranged on the viewing side of the liquid crystal cell. ..
  • the first pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B) as a monomer unit.
  • An ionic compound (B) is contained in the first pressure-sensitive adhesive layer, which can reduce the surface resistance value of the first pressure-sensitive adhesive layer and suppress the generation of static electricity, and the alignment of the liquid crystal layer due to charging. It is possible to suppress the occurrence of light leakage (uneven charging) due to disturbance of the light.
  • the first polarizing film is a one-sided protective polarizing film having a transparent protective film only on one side of the polarizer, which is advantageous in terms of thinning and cost reduction.
  • the compatibility balance in the layer is destroyed due to the mixing of water in the first pressure-sensitive adhesive layer in a humid environment, and the ionic compound is Penetration inside the polarizer changes the surface resistance value of the first pressure-sensitive adhesive layer. Further, when the ionic compound comes into contact with the polarizer, optical properties such as polarization degree may be deteriorated.
  • the transparent layer is provided between the polarizer of the first polarizing film and the first pressure-sensitive adhesive layer, the ionic compound in the first pressure-sensitive adhesive layer is changed to the polarizer by the transparent layer. Intrusion into the inside can be suppressed. Therefore, even in a humid environment, segregation or migration of the ionic compound (B) in the first pressure-sensitive adhesive layer to the interface of the polarizing film or the like can be suppressed, and deterioration of the polarizer with time can be suppressed. It is considered that the pressure-sensitive adhesive layer was able to maintain the surface resistance value within the desired value range for a long period of time, and was able to satisfy the stable antistatic function and optical characteristics.
  • the antistatic performance can be improved by providing the conductive layer between the transparent layer and the first pressure-sensitive adhesive layer. Since the conductive layer is provided via the transparent layer, the problem of decolorization of the end portion of the polarizer in a humid environment caused by directly providing the conductive layer on the polarizer does not occur.
  • the liquid crystal panel with a touch sensing function of the present invention is particularly suitable when an in-cell type liquid crystal cell or an on-cell type liquid crystal cell is used as the liquid crystal cell with a touch sensing function.
  • a liquid crystal panel with a built-in touch sensing function of the present invention will be described with reference to the drawings.
  • the liquid crystal panel with a built-in touch sensing function of the present invention is arranged on the opposite side of the liquid crystal cell C having the liquid crystal layer 3 and the touch sensor section 5, the first polarizing film 11 arranged on the viewer side of the liquid crystal cell C, and the viewer side.
  • the second polarizing film 12 has a first pressure-sensitive adhesive layer 21 disposed between the first polarizing film 11 and the liquid crystal cell C.
  • the respective configurations of the liquid crystal panel with a built-in touch sensing function of the present invention can be simply shown from the viewer side as follows: first polarizing film 11/first adhesive layer 21/liquid crystal cell C/second polarizing film 12. it can.
  • the order of each configuration is shown simply, but other configurations may be appropriately provided between each configuration.
  • the first polarizing film 11 can be provided as a polarizing film with an adhesive layer.
  • 4 is an example of a pressure-sensitive adhesive layer-attached polarizing film, and as shown in FIG. 4, is a polarizer a and a one-sided protective film having a transparent protective film b on only one side of the above-mentioned polarizer a.
  • a transparent layer c is provided on the other side of a.
  • the first polarizing film 11 is provided on the first adhesive layer 21 via the transparent layer c. It is preferable that the transparent layer c is directly provided on the polarizer a in terms of suppressing an increase in water content of the polarizer under a high temperature and high humidity environment.
  • the transparent layer c will be described later.
  • the polarizing film with the pressure-sensitive adhesive layer may have a conductive layer d between the transparent layer c and the first pressure-sensitive adhesive layer 21, as shown in FIG. 5. The conductive layer d will be described later.
  • FIGS. 1 to 3 Specific examples of the liquid crystal panel with a built-in touch sensing function of the present invention are shown in FIGS. 1 to 3, for example.
  • FIG. 1 shows a so-called in-cell type liquid crystal panel with a built-in touch sensing function, and from the viewer side, the first polarizing film 11, the first adhesive layer 21, the first transparent substrate 41, the touch sensor section 5, the liquid crystal layer 3 and The drive electrode/sensor unit 6/second transparent substrate 42/second adhesive layer 22/second polarizing film 12 is configured.
  • the liquid crystal cell C includes the touch sensor unit 5 and the drive electrode/sensor in the first and second glass substrates 41 and 42 (in the liquid crystal cell) with the liquid crystal layer 3 interposed therebetween. It has a part 6.
  • the second polarizing film 2 is a modification of a so-called in-cell type (semi-in-cell type) liquid crystal panel with a built-in touch sensing function.
  • the liquid crystal cell C is outside the first transparent substrate 41
  • the touch sensor unit 5 is in direct contact with the first adhesive layer 21, and the liquid crystal layer 3 is sandwiched.
  • the first and second glass substrates 41, 42 (in the liquid crystal cell) have the drive electrode/sensor unit 6 on the side of the second transparent substrate 42.
  • FIG. 3 shows a so-called on-cell type liquid crystal panel with a built-in touch sensing function, and from the viewing side, the first polarizing film 11, the first adhesive layer 21, the touch sensor unit 5, the drive electrode/sensor unit 6 and the 1 transparent substrate 41/liquid crystal layer 3/driving electrode 7/second transparent substrate 42/second adhesive layer 22/second polarizing film 12.
  • the liquid crystal cell C has the touch sensor unit 5 and the drive electrode/sensor unit 6 outside the first transparent substrate 41, and the touch sensor unit 5 is the first
  • the drive electrode 7 is provided on the side of the second transparent substrate 42 in the first and second glass substrates 41 and 42 (in the liquid crystal cell) that is in direct contact with the adhesive layer 21 and that sandwiches the liquid crystal layer 3.
  • the liquid crystal panel with a built-in touch sensing function when the touch sensor unit 5 of the liquid crystal cell C and the first adhesive layer 21 are in direct contact, the first adhesive layer 21 (containing an ionic compound) is prevented from being charged.
  • the function tends to deteriorate, especially in a humid environment. Therefore, the liquid crystal panel with a built-in touch sensing function of the present invention is suitably applied to the liquid crystal panel with a built-in touch sensing function shown in FIG. 2 or the on-cell type shown in FIG.
  • the first polarizing film 11 has the above-described structure, but the second polarizing film 12 generally has a transparent protective film on one side or both sides of the polarizer.
  • the first polarizing film 11 and the second polarizing film 12 are arranged on both sides of the liquid crystal layer 3 so that their transmission axes (or absorption axes) are orthogonal to each other.
  • the polarizer is not particularly limited, and various types can be used.
  • the polarizer include hydrophilic polymer films such as polyvinyl alcohol film, partially formalized polyvinyl alcohol film, and ethylene/vinyl acetate copolymer partially saponified film, and dichroism of iodine or dichroic dye.
  • examples include polyene-oriented films such as those obtained by adsorbing a substance and uniaxially stretched, polyvinyl alcohol dehydrated products, polyvinyl chloride dehydrochlorinated products, and the like.
  • a polarizer made of a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
  • the thickness of these polarizers is not particularly limited, but is generally about 80 ⁇ m or less.
  • a thin polarizer having a thickness of 10 ⁇ m or less can be used as the polarizer. From the viewpoint of thinning, the thickness is preferably 1 to 7 ⁇ m. It is preferable that such a thin polarizer has little thickness unevenness, excellent visibility, and excellent durability due to small dimensional change, and that the thickness of the polarizing film can be reduced.
  • thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier property, isotropic property, etc.
  • a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier property, isotropic property, etc.
  • thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, and cyclic resins.
  • examples thereof include polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
  • a transparent protective film is attached to one side of the polarizer with an adhesive layer, while a transparent protective film is attached to the other side as a (meth)acrylic type, urethane type, acrylic urethane type, epoxy type, or silicone type.
  • a thermosetting resin such as a system or an ultraviolet curable resin can be used.
  • a cellulose resin or a (meth)acrylic resin is preferable because the variation ratio (b/a) of the surface resistance value of the first adhesive layer can be controlled to be small.
  • the (meth)acrylic resin it is preferable to use a (meth)acrylic resin having a lactone ring structure.
  • the (meth)acrylic resin having a lactone ring structure include JP-A-2000-230016, JP-A-2001-151814, JP-A-2002-120326, JP-A-2002-254544, and JP-A-2005.
  • examples thereof include (meth)acrylic resins having a lactone ring structure described in Japanese Patent No. 146084.
  • the cellulose resin is preferable to the (meth)acrylic resin because it is more effective in suppressing the polarizer crack, which is a problem in the one-sided protective polarizing film.
  • a functional layer such as a hard coat layer, an antireflection layer, a sticking prevention layer, a diffusion layer or an antiglare layer can be provided on the surface of the transparent protective film to which the polarizer is not adhered.
  • the adhesive used for bonding the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and various types of water-based, solvent-based, hot-melt-based, radical-curable, and cation-curable types are used. However, a water-based adhesive or a radical curable adhesive is preferable.
  • the first polarizing film 11 arranged on the viewer side of the liquid crystal cell C and the second polarizing film 12 arranged on the opposite side of the viewer side are different optical films depending on the suitability of their respective locations. It can be used by stacking.
  • the other optical film for example, a liquid crystal display device such as a reflection plate, an anti-transmission plate, a retardation film (including a wavelength plate such as 1/2 or 1/4), a visual compensation film, and a brightness enhancement film is formed. Examples of the optical layer that can be used for These can be used in one layer or two or more layers. Even when these other optical films are used, it is preferable that the pressure-sensitive adhesive layer closest to the liquid crystal layer 3 is the first pressure-sensitive adhesive layer 21.
  • the first pressure-sensitive adhesive layer 21 is formed of a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).
  • the pressure-sensitive adhesive composition will be described in detail later.
  • the second adhesive layer 22 is formed from an adhesive.
  • various pressure-sensitive adhesives can be used, for example, rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, Examples thereof include polyacrylamide adhesives and cellulose adhesives.
  • An adhesive base polymer is selected according to the type of the adhesive.
  • an acrylic pressure-sensitive adhesive is preferably used because it has excellent optical transparency, exhibits appropriate wettability, cohesiveness, and adhesive properties of adhesiveness and is excellent in weather resistance and heat resistance. It
  • the thickness of the second adhesive layer 22 is not particularly limited and is, for example, about 1 to 100 ⁇ m. The thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and further preferably 5 to 35 ⁇ m.
  • the liquid crystal layer 3 included in the liquid crystal cell C is a liquid crystal layer that is applied to a liquid crystal panel with a built-in touch sensing function and that includes liquid crystal molecules that are homogeneously aligned in the absence of an electric field.
  • the liquid crystal layer 3 for example, an IPS type liquid crystal layer is preferably used.
  • any type of liquid crystal layer of TN type, STN type, ⁇ type, VA type or the like can be used as the liquid crystal layer 3.
  • the thickness of the liquid crystal layer is, for example, about 1.5 ⁇ m to 4 ⁇ m.
  • the first transparent substrate 41 and the second transparent substrate 42 can form a liquid crystal cell with the liquid crystal layer 3 interposed therebetween.
  • a touch sensor unit 5, a drive electrode/sensor unit 6, a drive electrode 7 and the like are formed inside or outside the liquid crystal cell according to the form of the liquid crystal panel with a built-in touch sensing function. Further, a color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41).
  • the material forming the transparent substrate is, for example, glass or polymer film.
  • the polymer film include polyethylene terephthalate, polycycloolefin, polycarbonate and the like.
  • the transparent substrate is made of glass, its thickness is, for example, about 0.3 mm to 1 mm.
  • the transparent substrate is formed of a polymer film, its thickness is, for example, about 10 ⁇ m to 200 ⁇ m.
  • the transparent substrate may have an easy adhesion layer or a hard coat layer on its surface.
  • the touch sensor unit 5 electrostatic capacitance sensor
  • the drive electrode/sensor unit 6, and the drive electrode 7 are formed as a transparent conductive layer.
  • the constituent material of the transparent conductive layer is not particularly limited, and examples thereof include metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, and these metals. Examples include alloys.
  • examples of the constituent material of the transparent conductive layer include metal oxides of indium, tin, zinc, gallium, antimony, zirconium and cadmium, and specifically, indium oxide, tin oxide, titanium oxide, cadmium oxide and these.
  • the metal oxide may further contain an oxide of a metal atom shown in the above group, if necessary.
  • indium oxide (ITO) containing tin oxide and tin oxide containing antimony are preferably used, and ITO is particularly preferably used.
  • the ITO preferably contains 80 to 99% by weight of indium oxide and 1 to 20% by weight of tin oxide.
  • the touch sensor layer 5 is formed in the liquid crystal cell C, and the touch sensor layer 5 is formed according to the form of the liquid crystal panel with the touch sensing function.
  • the touch sensor layer 5 can be formed as a transparent electrode pattern on the first transparent substrate 41, for example.
  • a transparent electrode pattern can be formed according to a conventional method according to the form of the liquid crystal panel with a touch sensing function.
  • the transparent electrode pattern is usually electrically connected to a wiring line (not shown) formed at an end of the transparent substrate, and the wiring line is connected to a controller IC (not shown).
  • the shape of the transparent electrode pattern may be a comb shape, a stripe shape, a rhombus shape, or any other shape depending on the application.
  • the height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm.
  • a member forming a liquid crystal display device such as a backlight or a reflection plate used for an illumination system can be appropriately used.
  • the thickness of the transparent layer is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, and further preferably 3 ⁇ m or less from the viewpoints of thinning and optical reliability, and further 1. It is preferably 5 ⁇ m or less, and more preferably 1 ⁇ m or less. If the transparent layer is too thick, the thickness of the polarizing film becomes large, and further, the optical reliability of the polarizer may be deteriorated. On the other hand, the thickness of the transparent layer is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, further preferably 0.3 ⁇ m or more, from the viewpoint of suppressing the fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer. Is preferred.
  • the material forming the transparent layer a material having transparency and having a fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer to a predetermined value can be used.
  • a material having transparency and having a fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer to a predetermined value can be used.
  • it is effective that the free volume pore diameter of the transparent layer is smaller than the molecular size of the hydrate of the ionic compound (B) contained in the pressure-sensitive adhesive layer.
  • a forming material containing a urethane prepolymer (a) which is a reaction product with alcohol can be mentioned.
  • a polyfunctional isocyanate compound for example, a polyfunctional isocyanate compound is preferable, and specifically, a polyfunctional aromatic isocyanate compound, an alicyclic isocyanate compound, an aliphatic isocyanate compound, or a dimer thereof can be mentioned.
  • polyfunctional aromatic isocyanate compound examples include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 4 , 4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, methylenebis 4-phenyl isocyanate, p-phenylene diisocyanate and the like.
  • polyfunctional alicyclic isocyanate compound examples include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-bisisocyanatomethylcyclohexane, isophorone diisocyanate, and hydrogen.
  • examples thereof include added diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate and hydrogenated tetramethyl xylylene diisocyanate.
  • polyfunctional aliphatic isocyanate compound examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, 2,4. 4-trimethylhexamethylene diisocyanate and the like can be mentioned.
  • examples of the polyfunctional isocyanate compound include those having three or more isocyanate groups such as tris(6-incyanate hexyl) isocyanurate.
  • polyhydric alcohol examples include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl- 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Examples thereof include methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol and polypropylene glycol.
  • the urethane prepolymer (a) a rigid structure in which a cyclic structure (benzene ring, cyanurate ring, isocyanurate ring, etc.) occupies a large proportion in the structure is used in the present invention.
  • the polyfunctional isocyanate compounds may be used alone or in combination of two or more, and aromatic isocyanate compounds are preferable from the viewpoint of suppressing water contamination in the polarizer.
  • Other polyfunctional isocyanate compounds can be used in combination with the aromatic isocyanate compound.
  • urethane prepolymer (a) trimethylolpropane-tri-tolylene isocyanate and trimethylolpropane-tri-diphenylmethane diisocyanate are preferably used.
  • the urethane prepolymer (a) is a compound having a terminal isocyanate group, and can be obtained, for example, by mixing an isocyanate compound and a polyhydric alcohol, stirring and reacting them. Usually, it is preferable to mix the isocyanate compound and the polyhydric alcohol so that the isocyanate group becomes excessive with respect to the hydroxyl group of the polyhydric alcohol.
  • the urethane prepolymer (a) may have a terminal isocyanate group with a protecting group.
  • Protecting groups include oximes and lactams. When the isocyanate group is protected, the protective group is dissociated from the isocyanate group by heating and the isocyanate group reacts.
  • the forming material for forming the transparent layer may contain, in addition to the urethane prepolymer (a), a compound (b) having at least two functional groups having active hydrogen having reactivity with an isocyanate group.
  • the functional group having active hydrogen having reactivity with an isocyanate group include a hydroxyl group and an amino group.
  • the compound (b) preferably has a molecular weight divided by the number of the functional groups of 350 or less. By thus defining the relationship between the molecular weight and the number of functional groups, the reactivity between the compound (b) and the isocyanate group of the urethane prepolymer (a) can be ensured.
  • the molecular weight of the compound (b) is preferably 1000 or less.
  • the compound (b) having a molecular weight in the range of 1,000 or less is preferable in terms of compatibility with the urethane prepolymer (a) when the forming material is prepared as a solution.
  • Examples of the compound (b) include polyhydric alcohols, polyvalent amines, compounds having a hydroxyl group and an amino group in the molecule, and the like.
  • polyhydric alcohol examples include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl- 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Bifunctional alcohols such as methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, polypropylene glycol; trifunctional alcohols such as glycerin and trimethylolpropane; tetrafunctional alcohols such as pentaerythritol, hexanetriol and
  • polyvalent amine examples include ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4'-diamine, dimerdiamine and the like.
  • Examples of the compound having a hydroxyl group and an amino group in the molecule include 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, di-2-hydroxyethylethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxy.
  • Diamines having a hydroxyl group in the molecule such as propylethylenediamine and di-2-hydroxypropylethylenediamine;
  • Alkanolamines such as ethanolamine, diethanolamine and triethanolamine can be mentioned.
  • the compound (b) it is preferable to use a polyhydric alcohol from the viewpoint of preventing the deterioration of the optical reliability of the polarizer.
  • a polyhydric alcohol from the viewpoint of preventing the deterioration of the optical reliability of the polarizer.
  • trimethylolpropane is preferable from the viewpoint of reactivity with the urethane prepolymer (a). preferable.
  • the forming material contains the urethane prepolymer (a) as a main component.
  • the urethane prepolymer (a) preferably contains 50% by weight or more of the solid content of the forming material.
  • the compounding ratio of the compound (b) to the urethane prepolymer (a) is 5% by weight or more based on the total 100% by weight (solid content ratio) of the urethane prepolymer (a) and the compound (b).
  • the compounding ratio of the compound (b) is preferably 10% by weight or more from the viewpoint of improving the film strength.
  • the compounding ratio of the compound (b) is 80% by weight or less, and further 50% by weight or less.
  • the compounding ratio of the compound (b) is 80% by weight or less, and further 50% by weight or less.
  • the above-mentioned forming material can use a reaction catalyst to further increase the reactivity of the isocyanate group.
  • the reaction catalyst is not particularly limited, but a tin-based catalyst or an amine-based catalyst is preferable.
  • As the reaction catalyst one kind or two or more kinds can be used.
  • the amount of the reaction catalyst used is usually 5 parts by weight or less based on 100 parts by weight of the urethane prepolymer (a). When the amount of the reaction catalyst is large, the crosslinking reaction rate is increased and foaming of the forming material occurs. Even if a forming material after foaming is used, sufficient adhesiveness cannot be obtained.
  • a reaction catalyst it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight.
  • a reaction catalyst can be used to further increase the reactivity of the isocyanate group.
  • the reaction catalyst is not particularly limited, but a tin-based catalyst or an amine-based catalyst is preferable.
  • As the reaction catalyst one kind or two or more kinds can be used.
  • the amount of the reaction catalyst used is usually 5 parts by weight or less with respect to 100 parts by weight of the urethane prepolymer. When the amount of the reaction catalyst is large, the crosslinking reaction rate is increased and foaming of the forming material occurs. Even if a forming material after foaming is used, sufficient adhesiveness cannot be obtained.
  • a reaction catalyst it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight.
  • the tin catalyst both inorganic and organic catalysts can be used, but organic catalysts are preferred.
  • the inorganic tin-based catalyst include stannous chloride and stannic chloride.
  • the organic tin-based catalyst preferably has at least one organic group such as an aliphatic group or an alicyclic group having a skeleton such as a methyl group, an ethyl group, an ether group, or an ester group. Examples thereof include tetra-n-butyltin, tri-n-butyltin acetate, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride and dibutyltin dilaurate.
  • the amine catalyst is not particularly limited.
  • those having at least one organic group such as alicyclic group such as quinoclidine, amidine and diazabicycloundecene are preferable.
  • Other examples of amine-based catalysts include triethylamine and the like.
  • reaction catalysts other than those mentioned above include cobalt naphthenate and benzyltrimethylammonium hydroxide.
  • the forming material is usually used as a solution containing the urethane prepolymer (a) and the compound (b).
  • the solution may be a solvent system or an aqueous system such as an emulsion, a colloidal dispersion or an aqueous solution.
  • the organic solvent is not particularly limited as long as it does not have a functional group having active hydrogen having reactivity with an isocyanate group and uniformly dissolves the urethane prepolymer (a) and the compound (b) constituting the forming material. Absent.
  • the organic solvent may be used alone or in combination of two or more.
  • different solvents can be used for the urethane prepolymer (a) and the compound (b).
  • the forming material can be prepared by mixing each solution after preparing each solution. Further, the viscosity of the forming material can be adjusted by further adding an organic solvent to the prepared forming material. Further, even in the case of a solvent-based solution dissolved in an organic solvent, alcohols, water and the like exemplified below can be contained as a solvent.
  • Organic solvents include aromatic hydrocarbons such as toluene and xylene); esters such as ethyl acetate and butyl acetate; aliphatic or alicyclic hydrocarbons such as hexane, cyclohexane and methylcyclohexane; 1,2-dichloroethane And the like; ethers such as tert-butyl methyl ether; ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, and acetylacetone; and the like.
  • aromatic hydrocarbons such as toluene and xylene
  • esters such as ethyl acetate and butyl acetate
  • aliphatic or alicyclic hydrocarbons such as hexane, cyclohexane and methylcyclohexane
  • 1,2-dichloroethane And the like ether
  • aqueous system for example, alcohols such as n-butyl alcohol and isopropyl alcohol, and ketones such as acetone can be mixed.
  • a dispersant is used, or urethane prepolymer is used as a functional group having low reactivity with isocyanate groups such as carboxylate, sulfonate, and quaternary ammonium salt, and water dispersibility such as polyethylene glycol. This can be done by introducing the components.
  • An epoxy resin can be used as a material for forming the transparent layer. Any appropriate epoxy resin can be used as the epoxy resin. An epoxy resin having an aromatic ring is preferably used as the epoxy resin. By using the epoxy resin, the surface resistance value of the pressure-sensitive adhesive layer can be prevented from changing over time, the adhesiveness with the polarizer can be further improved, and color loss from the end portion of the polarizer can be prevented. Further, when the pressure-sensitive adhesive layer is formed on the transparent layer, the anchoring force of the pressure-sensitive adhesive layer can be improved.
  • Examples of the epoxy resin having an aromatic ring include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin and other bisphenol type epoxy resins; phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxybenzaldehyde phenol novolac.
  • Novolak type epoxy resin such as epoxy resin; polyhydroxy type epoxy resin such as glycidyl ether of tetrahydroxyphenylmethane, glycidyl ether of tetrahydroxybenzophenone, epoxidized polyvinylphenol, naphthol type epoxy resin, naphthalene type epoxy resin, biphenyl type Examples thereof include epoxy resin.
  • a bisphenol A type epoxy resin a biphenyl type epoxy resin, and a bisphenol F type epoxy resin are used.
  • these epoxy resins color loss from the end of the polarizer can be further prevented. Only one epoxy resin may be used, or two or more epoxy resins may be used in combination.
  • the weight average molecular weight (Mw) of the epoxy resin is preferably 20,000 or more, more preferably 30,000 or more, and further preferably 37,000 or more. When the weight average molecular weight of the epoxy resin is within the above range, it is possible to further prevent color loss from the end portion of the polarizer.
  • the weight average molecular weight can be measured, for example, by GPC.
  • the material for forming the transparent layer may be, for example, an acrylic monomer in an amount of more than 50 parts by weight and a monomer represented by the following general formula (1) in an amount of more than 0 parts by weight and less than 50 parts by weight. It is possible to use a composition containing a polymer (a) (hereinafter, also referred to as a polymer (a)) obtained by polymerizing the above and an epoxy resin (b).
  • a polymer (a) hereinafter, also referred to as a polymer (a) obtained by polymerizing the above and an epoxy resin (b).
  • the content ratio of the polymer (a) and the epoxy resin (b) is preferably 95:5 to 60:40, or 40:60 to 1:99 by weight.
  • X is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group, and a carboxyl group. It represents a functional group containing at least one reactive group selected, and R 1 and R 2 are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or an optionally substituted heterocyclic group, and R 1 and R 2 may be linked to each other to form a ring).
  • the content ratio of the polymer (a) and the epoxy resin (b) in the composition is 95:5 to 60:40 by weight, or 40:60 to 1:99.
  • the content ratio of the polymer (a) and the epoxy resin (b) is within the above range, the surface resistance value of the pressure-sensitive adhesive layer is prevented from changing over time, the adhesiveness with the polarizer is excellent, and the end of the polarizer is obtained.
  • a resin composition for a transparent layer that can prevent color loss from a part is obtained. Further, when the content ratio of the polymer (a) and the epoxy resin (b) is within the above range, the anchoring force of the pressure-sensitive adhesive layer can be improved when the pressure-sensitive adhesive layer is formed on the transparent layer.
  • the content ratio of the polymer (a) and the epoxy resin (b) is preferably 95:5 to 80:20, or 20:80 to 5:95, and more preferably 90:10 to, by weight. 70:30 or 30:70 to 10:90. The closer the content ratio of the polymer (a) and the epoxy resin (b) is to the equal portion (50:50), the more likely the protective layer is whitened.
  • the polymer (a) is obtained by polymerizing more than 50 parts by weight of an acrylic monomer and more than 0 parts by weight and less than 50 parts by weight of the monomer represented by the general formula (1). can get.
  • the polymer (a) typically has a structure represented by the following formula.
  • the polymer (a) By polymerizing the monomer represented by the general formula (1) and an acrylic monomer component, the polymer (a) has a substituent containing a boron in the side chain (for example, repeating k in the following formula). Units). This can improve the adhesion between the polarizer and the layer (transparent layer) formed using the resin composition.
  • the substituent containing boron may be continuously contained in the polymer or may be randomly contained therein.
  • the polymer (a) may be used alone or in combination of two or more kinds. (In the formula, R 6 represents an arbitrary functional group, and j and k represent an integer of 1 or more).
  • the weight average molecular weight of the polymer (a) is preferably 10,000 or more, more preferably 20,000 or more, further preferably 35,000 or more, and particularly preferably 50,000 or more. ..
  • the weight average molecular weight of the polymer (a) is preferably 250,000 or less, more preferably 200,000 or less, still more preferably 150,000 or less.
  • the weight average molecular weight can be measured, for example, by GPC (solvent: dimethylformamide (DMF)).
  • the glass transition temperature of the polymer (a) is preferably 50° C. or higher, more preferably 60° C. or higher, even more preferably 80° C. or higher.
  • the glass transition temperature of the polymer (a) is preferably 300°C or lower. When the glass transition temperature is in the above range, the crack resistance of the layer (transparent layer) formed using the resin composition can be improved.
  • the polymer (a) includes an acrylic monomer in an amount of more than 50 parts by weight, an amount of the monomer represented by the formula (1) in an amount of more than 0 parts by weight and less than 50 parts by weight, and a polymerization initiator. It can be obtained by polymerizing the monomer composition containing the other monomer by any suitable polymerization method. Solution polymerization is preferably used as the polymerization method. By polymerizing the polymer (a) by solution polymerization, a higher molecular weight polymer can be obtained.
  • acrylic monomer Any appropriate acrylic monomer can be used as the acrylic monomer.
  • a (meth)acrylic acid ester-based monomer having a linear or branched structure and a (meth)acrylic acid ester-based monomer having a cyclic structure may be mentioned.
  • (meth)acrylic refers to acrylic and/or methacrylic.
  • Examples of the (meth)acrylic acid ester-based monomer having a linear or branched structure include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, and (meth)acrylic acid.
  • Examples include isopropyl, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, methyl 2-ethylhexyl (meth)acrylate, and 2-hydroxyethyl (meth)acrylate. ..
  • methyl (meth)acrylate is used.
  • the (meth)acrylic acid ester-based monomer may be used alone or in combination of two or more kinds.
  • Examples of the (meth)acrylic acid ester-based monomer having a cyclic structure include cyclohexyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 1-adamantyl (meth)acrylate, and ( Dicyclopentenyl (meth)acrylate, Dicyclopentenyloxyethyl (meth)acrylate, Dicyclopentanyl (meth)acrylate, Biphenyl (meth)acrylate, o-biphenyloxyethyl (meth)acrylate, o-biphenyloxyethoxy Ethyl (meth)acrylate, m-biphenyloxyethyl acrylate, p-biphenyloxyethyl (meth)acrylate, o-biphenyloxy-2-hydroxypropyl (meth)acrylate, p-biphenyloxy-2-hydroxypropyl (meth)acrylate
  • 1-adamantyl (meth)acrylate and dicyclopentanyl (meth)acrylate are used.
  • a polymer having a high glass transition temperature can be obtained.
  • monomers may be used alone or in combination of two or more.
  • (meth)acryloyl means an acryloyl group and/or a methacryloyl group.
  • a silsesquioxane compound having a (meth)acryloyl group may be used instead of the (meth)acrylic acid ester-based monomer.
  • an acrylic polymer having a high glass transition temperature can be obtained.
  • the silsesquioxane compound has various skeleton structures, for example, a skeleton structure such as a cage structure, a ladder structure, and a random structure.
  • the silsesquioxane compound may have only one type of these structures, or may have two or more types of these structures.
  • the silsesquioxane compound may be used alone or in combination of two or more kinds.
  • silsesquioxane compound having a (meth)acryloyl group for example, MAC grade and AC grade of SQ series of Toagosei Co., Ltd. can be used.
  • the MAC grade is a silsesquioxane compound containing a methacryloyl group, and specific examples thereof include MAC-SQ TM-100, MAC-SQ SI-20, MAC-SQ HDM and the like.
  • AC grade is a silsesquioxane compound containing an acryloyl group, and specific examples thereof include AC-SQ TA-100 and AC-SQ SI-20.
  • Acrylic monomer is used in excess of 50 parts by weight.
  • the acrylic monomer is used so that the total amount of the acrylic monomer and the monomer represented by the general formula (1) is 100 parts by weight.
  • a substituent containing boron is introduced into the side chain of the polymer (a). Therefore, the adhesion between the polarizer typically composed of the PVA-based resin and the layer (transparent layer) formed using the resin composition can be improved. In addition, the water resistance of the layer (transparent layer) itself formed using the resin composition is also improved, and color loss from the end portion of the polarizer can be prevented.
  • the monomers may be used alone or in combination of two or more.
  • X is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group, and a carboxyl group. It represents a functional group containing at least one reactive group selected, and R 1 and R 2 are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or an optionally substituted heterocyclic group, and R 1 and R 2 may be linked to each other to form a ring).
  • aliphatic hydrocarbon group a linear or branched alkyl group having 1 to 20 carbon atoms which may have a substituent, and a cyclic alkyl group having 3 to 20 carbon atoms which may have a substituent.
  • alkenyl group having 2 to 20 carbon atoms.
  • the aryl group include a phenyl group having 6 to 20 carbon atoms which may have a substituent and a naphthyl group having 10 to 20 carbon atoms which may have a substituent.
  • heterocyclic group include a 5-membered ring group and a 6-membered ring group containing at least one hetero atom which may have a substituent.
  • R 1 and R 2 may be linked to each other to form a ring.
  • R 1 and R 2 are preferably a hydrogen atom or a linear or branched alkyl group having 1 to 3 carbon atoms, and more preferably a hydrogen atom.
  • the reactive group contained in the functional group represented by X is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group. , And at least one selected from the group consisting of carboxyl groups.
  • the reactive groups are (meth)acrylic groups and/or (meth)acrylamide groups.
  • the functional group represented by X is represented by the general formula (2): ZY— (wherein Z is a vinyl group, a (meth)acryl group, a styryl group, a (meth)acrylamide group.
  • Z represents a functional group containing at least one reactive group selected from the group consisting of a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group, and a carboxyl group
  • Y represents an organic group. It is preferable that it is a functional group represented by these.
  • the organic group specifically means an organic group having 1 to 20 carbon atoms which may have a substituent, and more specifically, for example, having a substituent having 1 to 20 carbon atoms.
  • organic group specifically means an organic group having 1 to 20 carbon atoms which may have a substituent, and more specifically, for example, having a substituent having 1 to 20 carbon atoms.
  • linear or branched alkylene group cyclic alkylene group having 3 to 20 carbon atoms which may have a substituent, phenylene group having 6 to 20 carbon atoms which may have a substituent, and 10 to 10 carbon atoms. Examples thereof include a naphthylene group which may have 20 substituents.
  • hydroxyethyl acrylamide and boric acid ester methylol acrylamide and boric acid ester, hydroxyethyl acrylate and boric acid ester, and An ester of (meth)acrylate and boric acid can be exemplified, such as an ester of hydroxybutyl acrylate and boric acid.
  • the content of the monomer represented by the general formula (1) is more than 0 parts by weight and less than 50 parts by weight. It is preferably 0.01 parts by weight or more and less than 50 parts by weight, more preferably 0.05 parts by weight to 20 parts by weight, and further preferably 0.1 parts by weight to 10 parts by weight. When the content of the monomer exceeds 50 parts by weight, color loss may easily occur from the edges.
  • peroxides such as benzoyl peroxide, lauroyl peroxide and sodium peroxide
  • hydroperoxides such as t-butyl hydroperoxide and cumene hydroperoxide
  • azo compounds such as azobisisobutyronitrile
  • the content of the polymerization initiator may be any appropriate amount.
  • the content of the polymerization initiator is preferably 0.1 part by weight to 5 parts by weight, more preferably 0.3 part by weight to 2 parts by weight.
  • the polymer (a) is preferably obtained by solution polymerization of a monomer component such as an acrylic monomer and a monomer represented by the general formula (1).
  • a monomer component such as an acrylic monomer and a monomer represented by the general formula (1).
  • Any appropriate solvent can be used as the solvent used in the solution polymerization.
  • water alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol; aromatic or aliphatic hydrocarbons such as benzene, toluene, xylene, cyclohexane, n-hexane; ester compounds such as ethyl acetate; ketones such as acetone and methyl ethyl ketone.
  • Cyclic ether compounds such as tetrahydrofuran and dioxane, etc. may be mentioned. These solvents may be used alone or in combination of two or more. Moreover, you may use together an organic solvent and water.
  • the polymerization reaction can be performed at any appropriate temperature and time.
  • the polymerization reaction can be carried out in the range of 50°C to 100°C, preferably 60°C to 80°C.
  • the reaction time is, for example, 1 hour to 8 hours, preferably 3 hours to 5 hours.
  • Epoxy resin (b) Any appropriate epoxy resin can be used as the epoxy resin (b).
  • An epoxy resin having an aromatic ring is preferably used as the epoxy resin (b).
  • an epoxy resin having an aromatic ring is preferably used as the epoxy resin (b).
  • Examples of the epoxy resin having an aromatic ring include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin and other bisphenol type epoxy resins; phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxybenzaldehyde phenol novolac.
  • Novolak type epoxy resin such as epoxy resin; polyhydroxy type epoxy resin such as glycidyl ether of tetrahydroxyphenylmethane, glycidyl ether of tetrahydroxybenzophenone, epoxidized polyvinylphenol, naphthol type epoxy resin, naphthalene type epoxy resin, biphenyl type Examples thereof include epoxy resin.
  • a bisphenol A type epoxy resin a biphenyl type epoxy resin, and a bisphenol F type epoxy resin are used.
  • these epoxy resins color loss from the end of the polarizer can be further prevented. Only one epoxy resin may be used, or two or more epoxy resins may be used in combination.
  • the epoxy resin (b) preferably has a weight average molecular weight (Mw) of 20,000 or more, more preferably 30,000 or more, still more preferably 37,000 or more.
  • Mw weight average molecular weight
  • the weight average molecular weight can be measured, for example, by GPC.
  • the resin composition for a transparent layer may contain any appropriate other component in addition to the epoxy resin, the polymer (a) and the epoxy resin (b).
  • Other components include, for example, a solvent and an additive.
  • a solvent a solvent that can be used in solution polymerization of the polymer (a) may be used, or another solvent may be used.
  • the other solvent ethyl acetate, toluene, methyl ethyl ketone, and cyclopentanone are preferably used. These solvents may be used alone or in combination of two or more.
  • any appropriate additive can be used as the additive.
  • surfactants for example, surfactants, ultraviolet absorbers, antioxidants, tackifiers and the like can be mentioned.
  • As the additive only one kind may be used, or two or more kinds may be used in combination. These additives can be used in any suitable amount.
  • the transparent layer resin composition can be prepared by any appropriate method. For example, it can be prepared by mixing the polymer (a), the epoxy resin (b), and, if necessary, any appropriate additive in any appropriate solvent. When the polymer (a) is polymerized by solution polymerization, it may be prepared by adding the epoxy resin (b) and any appropriate additive to the polymer solution of the polymer (a) and mixing them. Good.
  • the forming material containing the epoxy resin As a material for forming a transparent layer other than the forming material containing the urethane prepolymer (a), the forming material containing the epoxy resin, and the forming material of the composition containing the polymer (a) and the epoxy resin (b)
  • Examples include cyanoacrylate-based forming materials, epoxy-based forming materials, urethane acrylate-based forming materials, and the like.
  • the formation of the transparent layer can be appropriately selected depending on the type of the forming material.
  • the transparent layer can be formed by applying the forming material to a polarizer or the like and then curing it. It can be obtained as a layer. Usually, it is carried out by forming a cured layer by drying at about 30 to 100° C., preferably at 50 to 80° C. for about 0.5 to 15 minutes after the coating. Further, when the forming material contains an isocyanate component, an annealing treatment is performed at about 30 to 100° C., preferably at 50 to 80° C. for about 0.5 to 24 hours in order to accelerate the reaction. You can
  • the following describes the pressure-sensitive adhesive composition that forms the first pressure-sensitive adhesive layer 21.
  • the pressure-sensitive adhesive composition contains a (meth)acrylic polymer (A) and an ionic compound (B).
  • the (meth)acrylic polymer (A) contains, as a monomer unit, an alkyl (meth)acrylate (a1) as a main component.
  • (meth)acrylate refers to acrylate and/or methacrylate, and has the same meaning as (meth) of the present invention.
  • Examples of the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer (A) include linear or branched alkyl groups having 1 to 18 carbon atoms.
  • Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an amyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a nonyl group, and a decyl group.
  • Examples thereof include a group, an isodecyl group, a dodecyl group, an isomyristyl group, a lauryl group, a tridecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group and an octadecyl group. These can be used alone or in combination.
  • the average carbon number of these alkyl groups is preferably 3-9.
  • the weight ratio of the alkyl (meth)acrylate (a1) is 70% by weight or more in the weight ratio of all the constituent monomers (100% by weight) constituting the (meth)acrylic polymer (A) as a monomer unit. preferable.
  • the weight ratio of the alkyl (meth)acrylate (a1) can be considered as the balance of the other copolymerizable monomers. It is preferable to set the weight ratio of the alkyl (meth)acrylate (a1) within the above range in order to secure the adhesiveness.
  • (meth)acrylic polymer (A) in addition to the monomer unit of the alkyl (meth)acrylate (a1), a (meth)acryloyl group, a vinyl group or the like for the purpose of improving adhesiveness and heat resistance.
  • One or more copolymerizable monomers having a polymerizable functional group having an unsaturated double bond can be introduced by copolymerization.
  • Examples of the copolymerizable monomer include functional group-containing monomers such as amide group-containing monomers, carboxyl group-containing monomers, and hydroxyl group-containing monomers. Among these, the amide group-containing monomer (a2) is preferable.
  • the amide group introduced into the side chain in the (meth)acrylic polymer (A) which is the base polymer Due to the presence of the amide group, the surface resistance value of the first pressure-sensitive adhesive layer, which is adjusted by blending the ionic compound (B), is suppressed from fluctuating and increasing even under a humid environment. It is preferable to maintain it within the range.
  • Compatibility of the (meth)acrylic polymer (A) with the ionic compound (B) due to the presence of the amide group introduced as a functional group of the copolymerization monomer in the side chain of the (meth)acrylic polymer (A) Is expected to rise.
  • the pressure-sensitive adhesive layer has a glass and a transparent conductive layer (ITO layer or the like) when an amide group introduced into a side chain in a (meth)acrylic polymer (A) which is a base polymer is present. It has good durability against any of the above, and it is possible to suppress the occurrence of peeling, floating, etc. in the state of being attached to the liquid crystal panel. Further, the durability can be satisfied even in a humid environment (after a humidification reliability test).
  • the amide group-containing monomer (a2) is a compound containing an amide group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or a vinyl group.
  • Specific examples of the amide group-containing monomer (a2) include (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide.
  • the amide group-containing monomer (a2) is preferable for suppressing an increase in surface resistance value over time (particularly in a humid environment) and satisfying durability.
  • the amide group-containing monomers (a2) particularly the N-vinyl group-containing lactam-based monomer suppresses an increase in the surface resistance value over time (especially in a humid environment), or a transparent conductive layer (touch). It is preferable in satisfying the durability against the sensor layer).
  • the amide group-containing monomer having a hydroxyl group tends to have improved conductivity in combination with the ionic compound (B), and when the use ratio increases, a polarizing film ( It is preferably not used because there is a problem in anchoring force with the optical film) and reworkability with the transparent conductive layer (touch sensor layer).
  • the weight ratio of the amide group-containing monomer (a2) is preferably 0.1% by weight or more from the viewpoint of suppressing an increase in the surface resistance value over time (particularly in a humid environment).
  • the weight ratio is preferably 0.3% by weight or more, and more preferably 0.5% by weight or more.
  • the weight ratio is preferably 35% by weight or less, and further 20% by weight or less. It is more preferably 10% by weight or less, and even more preferably less than 5% by weight.
  • a carboxyl group-containing monomer is a compound that has a carboxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or a vinyl group.
  • Specific examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid and the like.
  • acrylic acid is preferable from the viewpoint of copolymerizability, price and adhesive property.
  • a hydroxyl group-containing monomer is a compound that contains a hydroxyl group in its structure and also contains a polymerizable unsaturated double bond such as a (meth)acryloyl group and a vinyl group.
  • Specific examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and 8-.
  • hydroxyalkyl (meth)acrylates such as hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl acrylate.
  • hydroxyl group-containing monomers 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferable, and 4-hydroxybutyl (meth)acrylate is particularly preferable, from the viewpoint of durability.
  • the carboxyl group-containing monomer and the hydroxyl group-containing monomer become reaction points with the crosslinking agent. Since the carboxyl group-containing monomer and the hydroxyl group-containing monomer have high reactivity with the intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the obtained pressure-sensitive adhesive layer. Further, the carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability, and the hydroxyl group-containing monomer is preferable from the viewpoint of reworkability.
  • the above-mentioned weight ratio of the carboxyl group-containing monomer is preferably 2% by weight or less, more preferably 0.01 to 2% by weight, further preferably 0.05 to 1.5% by weight, further preferably 0.1. It is preferably 1 to 1% by weight, and most preferably 0.1 to 0.5% by weight. It is preferable in terms of durability that the weight ratio of the carboxyl group-containing monomer be 0.01% by weight or more. On the other hand, if it exceeds 2% by weight, it is not preferable from the viewpoint of reworkability.
  • the weight ratio of the hydroxyl group-containing monomer is preferably 3% by weight or less, more preferably 0.01 to 3% by weight, further preferably 0.1 to 2% by weight, and further 0.2 to 2% by weight is preferred. It is preferable that the weight ratio of the hydroxyl group-containing monomer is 0.01% by weight or more from the viewpoint of crosslinking the pressure-sensitive adhesive layer, durability and adhesive properties. On the other hand, if it exceeds 3% by weight, it is not preferable in terms of durability.
  • aromatic ring-containing (meth)acrylate As the copolymerization monomer, for example, aromatic ring-containing (meth)acrylate can be used.
  • the aromatic ring-containing (meth)acrylate is a compound containing an aromatic ring structure in its structure and a (meth)acryloyl group.
  • the aromatic ring include a benzene ring, a naphthalene ring and a biphenyl ring.
  • aromatic ring-containing (meth)acrylate examples include, for example, benzyl(meth)acrylate, phenyl(meth)acrylate, o-phenylphenol(meth)acrylate phenoxy(meth)acrylate, phenoxyethyl(meth)acrylate, phenoxypropyl.
  • aromatic ring-containing (meth)acrylate benzyl (meth)acrylate and phenoxyethyl (meth)acrylate are preferable, and phenoxyethyl (meth)acrylate is particularly preferable, from the viewpoint of adhesive properties and durability.
  • the weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25% by weight or less, more preferably 3 to 25% by weight, further preferably 10 to 22% by weight, further 14 to 20% by weight. Is preferred.
  • the weight ratio of the aromatic ring-containing (meth)acrylate is 3% by weight or more, it is preferable for suppressing display unevenness. On the other hand, when it exceeds 25% by weight, uneven display is not sufficiently suppressed and durability tends to be deteriorated.
  • copolymerizable monomers other than the above include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; allylsulfonic acid, 2-(meth)acrylamide-2- Examples thereof include sulfonic acid group-containing monomers such as methyl propane sulfonic acid, (meth)acrylamide propane sulfonic acid and sulfopropyl (meth)acrylate; and phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate.
  • acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride
  • caprolactone adducts of acrylic acid allylsulfonic acid, 2-(meth)acrylamide-2-
  • sulfonic acid group-containing monomers such as methyl propane sulfonic acid, (meth)acrylamide propane sulfonic acid and sulfoprop
  • alkylaminoalkyl(meth)acrylates such as aminoethyl(meth)acrylate, N,N-dimethylaminoethyl(meth)acrylate, t-butylaminoethyl(meth)acrylate; methoxyethyl(meth)acrylate, ethoxyethyl( Alkoxyalkyl (meth)acrylates such as (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, etc.
  • Succinimide-based monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide and N-phenylmaleimide; N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N- Examples of monomers for modification are also itaconimide-based monomers such as octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide, and N-lauryl itaconimide.
  • vinyl-based monomers such as vinyl acetate and vinyl propionate; cyanoacrylate-based monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; polyethylene glycol (meth).
  • Glycol-based (meth)acrylates such as acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methoxy polypropylene glycol (meth)acrylate; tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, silicone (meth) ) Acrylate and (meth)acrylate monomers such as 2-methoxyethyl acrylate can also be used. Further, isoprene, butadiene, isobutylene, vinyl ether and the like can be mentioned.
  • examples of copolymerizable monomers other than the above include silane-based monomers containing a silicon atom.
  • examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane.
  • the copolymerization monomer tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, neo Pentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate , Polyfunctional having two or more unsaturated double bonds such as (meth)acryloyl group and vinyl group such as esterification products of (meth)acrylic acid such as caprolactone-modified dipentaerythritol hexa(meth)acrylate
  • the proportion of the other copolymerizable monomer in the (meth)acrylic polymer (A) is about 0 to 10% in the weight ratio of all the constituent monomers (100% by weight) of the (meth)acrylic polymer (A). Further, it is preferably about 0 to 7%, more preferably about 0 to 5%.
  • the (meth)acrylic polymer (A) of the present invention usually preferably has a weight average molecular weight of 1,000,000 to 2,500,000. Considering durability, particularly heat resistance, the weight average molecular weight is preferably 1.2 to 2,000,000. A weight average molecular weight of 1,000,000 or more is preferable in terms of heat resistance. When the weight average molecular weight is more than 2.5 million, the pressure sensitive adhesive tends to be hard and peeling easily occurs.
  • the weight average molecular weight (Mw)/number average molecular weight (Mn) showing the molecular weight distribution is preferably 1.8 or more and 10 or less, further 1.8 to 7, and further 1.8 to. It is preferably 5.
  • the weight average molecular weight and the molecular weight distribution (Mw/Mn) can be obtained from the values calculated by polystyrene measurement by GPC (gel permeation chromatography).
  • the obtained (meth)acrylic polymer (A) may be any of a random copolymer, a block copolymer, a graft copolymer and the like.
  • solution polymerization ethyl acetate, toluene, etc. are used as a polymerization solvent.
  • the reaction is usually carried out under a stream of an inert gas such as nitrogen and a polymerization initiator at about 50 to 70° C. for about 5 to 30 hours.
  • the polymerization initiator, chain transfer agent, emulsifier and the like used for radical polymerization are not particularly limited and can be appropriately selected and used.
  • the weight average molecular weight of the (meth)acrylic polymer (A) can be controlled by the amount of the polymerization initiator and the chain transfer agent used and the reaction conditions, and the amount thereof can be adjusted appropriately according to these types. It
  • the pressure-sensitive adhesive composition of the present invention contains an ionic compound (B).
  • an ionic compound (B) an alkali metal salt and/or an organic cation-anion salt can be preferably used.
  • organic and inorganic salts of alkali metal can be used.
  • the term “organic cation-anion salt” as used in the present invention means an organic salt in which the cation portion is composed of an organic substance, and the anion portion may be an organic substance or an inorganic substance. It may be.
  • the “organic cation-anion salt” is also called an ionic liquid or an ionic solid.
  • alkali metal ion forming the cation portion of the alkali metal salt examples include lithium, sodium and potassium ions. Among these alkali metal ions, lithium ion is preferable.
  • the anion part of the alkali metal salt may be composed of an organic material or an inorganic material.
  • the anion moiety constituting the organic salt include CH 3 COO ⁇ , CF 3 COO ⁇ , CH 3 SO 3 ⁇ , CF 3 SO 3 ⁇ , (CF 3 SO 2 ) 3 C ⁇ , C 4 F 9 SO 3 -, C 3 F 7 COO - , (CF 3 SO 2) (CF 3 CO) N -, - O 3 S (CF 2) 3 SO 3 -, PF 6 -, CO 3 2-, or the following general formula ( A) to (D), (A): (C n F 2n+1 SO 2 ) 2 N ⁇ (where n is an integer of 10 to 10), (B): CF 2 (C m F 2m SO 2 ) 2 N ⁇ (where m is an integer of 1 to 10), (C): - O 3 S (CF 2) l SO 3 - ( where, l is an integer of from 1 to 10), (D
  • the anion moiety containing a fluorine atom is preferably used because an ionic compound having a good ion dissociation property can be obtained.
  • the anion moiety constituting the inorganic salt include Cl ⁇ , Br ⁇ , I ⁇ , AlCl 4 ⁇ , Al 2 Cl 7 ⁇ , BF 4 ⁇ , PF 6 ⁇ , ClO 4 ⁇ , NO 3 ⁇ , AsF 6 ⁇ , SbF. 6 ⁇ , NbF 6 ⁇ , TaF 6 ⁇ , (CN) 2 N ⁇ , etc. are used.
  • organic salt of an alkali metal examples include sodium acetate, sodium alginate, sodium ligninsulfonate, sodium toluenesulfonate, LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N and Li(CF 3 SO 2 ) 2 N, Li (C 2 F 5 SO 2) 2 N, Li (C 4 F 9 SO 2) 2 N, Li (CF 3 SO 2) 3 C, KO 3 S (CF 2) 3 SO 3 K, LiO 3 S (CF 2) 3 SO 3 K , and the like, among these LiCF 3 SO 3, Li (CF 3 SO 2) 2 N, Li (C 2 F 5 SO 2) 2 N, Li (C 4 F 9 SO 2) 2 N, Li (CF 3 SO 2) 3 C and the like are preferable, Li (CF 3 SO 2) 2 N, Li (C 2 F 5 SO 2) 2 N, Li (C 4 F 9 SO 2 ) A fluorine-containing lithium imide salt that is a bis(fluorosulfonyl)imide lithium salt such as 2 N is more preferable, and
  • examples of inorganic salts of alkali metals include lithium perchlorate and lithium iodide.
  • the organic cation-anion salt used in the present invention is composed of a cation component and an anion component, and the cation component is an organic substance.
  • the cation component specifically, a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, a cation having a pyrroline skeleton, a cation having a pyrrole skeleton, an imidazolium cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium cation, Examples thereof include a pyrazolium cation, a pyrazolinium cation, a tetraalkylammonium cation, a trialkylsulfonium cation, and a tetraalkylphosphonium cation.
  • anion component examples include Cl ⁇ , Br ⁇ , I ⁇ , AlCl 4 ⁇ , Al 2 Cl 7 ⁇ , BF 4 ⁇ , PF 6 ⁇ , ClO 4 ⁇ , NO 3 ⁇ , CH 3 COO ⁇ , CF 3 COO.
  • organic cation-anion salt a compound comprising a combination of the above cation component and anion component is appropriately selected and used.
  • organic cation-anion salt include, for example, methyltrioctylammonium bis(trifluoromethanesulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, ethylmethylimidazolium bis( Fluorosulfonylimide).
  • 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and ethylmethylimidazolium bis(fluorosulfonylimide) are more preferable.
  • ionic compound (B) in addition to the above-mentioned alkali metal salts and organic cation-anion salts, inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride and ammonium sulfate. Is mentioned.
  • the ionic compound (B) may be used alone or in combination in order to obtain a desired resistance value.
  • an alkali metal salt is an antistatic agent. It is preferable from the viewpoint of enhancing the performance, and by using the alkali metal salt, a pressure-sensitive adhesive having high antistatic performance can be obtained even with a small number of parts.
  • an organic cation-anion salt is used as the ionic compound (B). It is preferable in terms of enhancing antistatic performance, and by using an organic cation-anion salt, a pressure-sensitive adhesive having high antistatic performance can be obtained even with a smaller number of parts.
  • the ratio of the ionic compound (B) in the pressure-sensitive adhesive composition of the present invention can be appropriately adjusted so as to satisfy the antistatic property of the pressure-sensitive adhesive layer and the sensitivity of the touch panel.
  • the first adhesive layer is controlled so that the initial surface resistance value is in the range of 1 ⁇ 10 8 to 1 ⁇ 10 10 ⁇ / ⁇ . preferable.
  • the first adhesive layer has an initial surface resistance value of 1 ⁇ 10 10 to 1 ⁇ 10 12 ⁇ / It is preferable to control in the range of ⁇ .
  • the first pressure-sensitive adhesive layer is controlled so as to satisfy a variation ratio (b/a) of surface resistance value ⁇ 10.
  • the a is a first polarizing film with a pressure-sensitive adhesive layer in which the first pressure-sensitive adhesive layer is provided on the transparent layer of the first polarizing film, and a separator is provided on the first pressure-sensitive adhesive layer. Is the surface resistance value of the first pressure-sensitive adhesive layer when the separator is peeled immediately after, and b is the first polarizing film with the pressure-sensitive adhesive layer is put into a humidified environment of 60° C./95% RH for 250 hours. The surface resistance value of the first pressure-sensitive adhesive layer when the separator is peeled off after further drying at 40° C. for 1 hour.
  • the fluctuation ratio (b/a) is preferably 5 or less, more preferably 3.5 or less, further preferably 2.5 or less, and further preferably 2 or less. , 1.5 or less is most preferable.
  • the ratio of the ionic compound (B) is preferably 0.01 parts by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A). It is preferable to use 0.01 parts by weight or more of the ionic compound (B) in order to improve antistatic performance. From this viewpoint, the ionic compound (B) is preferably 0.1 part by weight or more, and more preferably 0.5 part by weight or more. On the other hand, when the amount of the ionic compound (B) increases, the surface resistance value becomes too low and the baseline fluctuation (malfunction at the time of touch caused by the surface resistance value being too low) may reduce the sensitivity of the touch panel. There is.
  • the amount of the ionic compound (B) is usually preferably 40 parts by weight or less, more preferably 30 parts by weight or less, further preferably 20 parts by weight or less, and 10 parts by weight or less. Most preferably.
  • the pressure-sensitive adhesive composition of the present invention may contain a crosslinking agent (C).
  • An organic crosslinking agent or a polyfunctional metal chelate can be used as the crosslinking agent (C).
  • the organic crosslinking agent include isocyanate crosslinking agents, peroxide crosslinking agents, epoxy crosslinking agents, imine crosslinking agents, and the like.
  • the polyfunctional metal chelate is a polyvalent metal having a covalent bond or a coordinate bond with an organic compound. Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn and Ti. Can be mentioned.
  • Examples of the atom in the organic compound that forms a covalent bond or a coordinate bond include an oxygen atom, and examples of the organic compound include an alkyl ester, an alcohol compound, a carboxylic acid compound, an ether compound, and a ketone compound.
  • crosslinking agent (C) an isocyanate crosslinking agent and/or a peroxide crosslinking agent are preferable.
  • isocyanate cross-linking agent (C) a compound having at least two isocyanate groups can be used.
  • known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates and the like which are generally used for urethanization reaction are used.
  • the peroxide can be appropriately used as long as it generates a radical active species by heating or light irradiation to promote crosslinking of the base polymer of the pressure-sensitive adhesive composition, but in consideration of workability and stability. It is preferable to use a peroxide having a 1-minute half-life temperature of 80° C. to 160° C., and more preferably 90° C. to 140° C.
  • peroxides examples include di(2-ethylhexyl)peroxydicarbonate (1 minute half-life temperature: 90.6° C.), di(4-t-butylcyclohexyl)peroxydicarbonate (1 Minute half-life temperature: 92.1° C.), di-sec-butyl peroxydicarbonate (1 minute half-life temperature: 92.4° C.), t-butyl peroxy neodecanoate (1 minute half-life temperature: 103 0.5° C.), t-hexyl peroxypivalate (1 minute half-life temperature: 109.1° C.), t-butyl peroxypivalate (1 minute half-life temperature: 110.3° C.), dilauroyl peroxide ( 1-minute half-life temperature: 116.4°C), di-n-octanoyl peroxide (1-minute half-life temperature: 117.4°C), 1,1,3,3-tetramethylbutylperoxy-2-ethy
  • the amount of the cross-linking agent (C) used is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, further 0.02 parts by weight based on 100 parts by weight of the (meth)acrylic polymer (A).
  • the amount is preferably 2 to 2 parts by weight, more preferably 0.03 to 1 part by weight.
  • the pressure-sensitive adhesive composition of the present invention may contain a silane coupling agent (D).
  • the durability can be improved by using the silane coupling agent (D).
  • the silane coupling agent include, for example, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2-(3, Epoxy group-containing silane coupling agent such as 4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl- Amino group-containing silane coupling agents such as N-(1,3-dimethylbutylidene)propylamine, N-phenyl- ⁇ -aminopropyltrimethoxysilane, 3-acryloxypropyltri
  • silane coupling agent (D) one having a plurality of alkoxysilyl groups in the molecule can be used.
  • a silane coupling agent having a plurality of alkoxysilyl groups in these molecules does not easily volatilize, and since it has a plurality of alkoxysilyl groups, it is effective in improving durability and is preferable.
  • the durability is also suitable when the adherend of the optical film with the pressure-sensitive adhesive layer is a transparent conductive layer (for example, ITO) in which an alkoxysilyl group is less likely to react than glass.
  • the silane coupling agent having a plurality of alkoxysilyl groups in the molecule preferably has an epoxy group in the molecule, and more preferably has a plurality of epoxy groups in the molecule.
  • the silane coupling agent having a plurality of alkoxysilyl groups in the molecule and having an epoxy group tends to have good durability even when the adherend is a transparent conductive layer (for example, ITO).
  • silane coupling agent having a plurality of alkoxysilyl groups in the molecule and having an epoxy group examples include X-41-1053, X-41-1059A and X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd.
  • X-41-1056 manufactured by Shin-Etsu Chemical Co. which has a high epoxy group content, is preferable.
  • the silane coupling agent (D) may be used alone or in combination of two or more kinds, but the content as a whole is the (meth)acrylic polymer (A)100.
  • the amount is preferably 5 parts by weight or less, more preferably 0.001 to 5 parts by weight, further preferably 0.01 to 1 part by weight, further preferably 0.02 to 1 part by weight, and further preferably Is preferably 0.05 to 0.6 parts by weight. This is the amount that improves durability.
  • a polyether compound (E) having a reactive silyl group can be added to the pressure-sensitive adhesive composition of the present invention.
  • the polyether compound (E) is preferable in that the reworkability can be improved.
  • the polyether compound (E) for example, those disclosed in JP 2010-275522A can be used.
  • the proportion of the polyether compound (E) in the pressure-sensitive adhesive composition of the present invention is preferably 10 parts by weight or less, and more preferably 0.001 to 10 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer (A). ..
  • the polyether compound (E) is preferably 0.01 part by weight or more, and more preferably 0.1 part by weight or more.
  • the polyether compound (E) is preferably 5 parts by weight or less, and more preferably 2 parts by weight or less.
  • the ratio of the polyether compound (E) can be set to a preferable range by adopting the upper limit value or the lower limit value.
  • the pressure-sensitive adhesive composition of the present invention may contain other known additives, for example, polyether compounds of polyalkylene glycol such as polypropylene glycol, colorants, powders such as pigments, dyes, Surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, antioxidants, light stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metals Powders, particles, foils and the like can be appropriately added depending on the intended use. Further, a redox system to which a reducing agent is added may be adopted within a controllable range. These additives are preferably used in an amount of 5 parts by weight or less, more preferably 3 parts by weight or less, and further preferably 1 part by weight or less with respect to 100 parts by weight of the (meth)acrylic polymer (A).
  • additives are preferably used in an amount of 5 parts by weight or less, more preferably 3 parts by weight or less, and further preferably 1 part by weight
  • the first adhesive layer 21 of the present invention can be used as an optical film with an adhesive layer attached to an optical film (polarizing film).
  • the optical film with a pressure-sensitive adhesive layer can be obtained by forming a pressure-sensitive adhesive layer with the pressure-sensitive adhesive composition on at least one surface of the optical film.
  • the pressure-sensitive adhesive composition is applied to a release-treated separator or the like, and a polymerization solvent or the like is dried and removed to form a pressure-sensitive adhesive layer, which is then transferred to an optical film (polarizing film).
  • a method of forming the pressure-sensitive adhesive layer on the optical film by coating the pressure-sensitive adhesive composition on an optical film (polarizing film) and drying and removing the polymerization solvent.
  • one or more solvents other than the polymerization solvent may be newly added as appropriate.
  • the thickness of the first adhesive layer 21 is not particularly limited and is, for example, about 1 to 100 ⁇ m.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and further preferably 5 to 35 ⁇ m.
  • the thickness of the conductive layer d is preferably 1 ⁇ m or less, and more preferably 0.01 to 0.5 ⁇ m, from the viewpoint of the stability of the surface resistance value and the adhesiveness with the first pressure-sensitive adhesive layer 21.
  • the thickness is preferably 0.01 to 0.2 ⁇ m, more preferably 0.01 to 0.1 ⁇ m.
  • the surface resistance value of the conductive layer d is preferably 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ , from the viewpoint of the antistatic function, and 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ / ⁇ . Is more preferable, and further preferably 1 ⁇ 10 8 to 1 ⁇ 10 10 ⁇ .
  • the conductive layer can be formed from various antistatic agent compositions.
  • an ionic surfactant system As the antistatic agent forming the conductive layer, an ionic surfactant system, a conductive polymer, conductive fine particles, carbon nanotubes, etc. can be used.
  • conductive polymers and carbon nanotubes are preferably used from the viewpoints of optical properties, appearance, antistatic effect, and stability of antistatic effect when heated and humidified.
  • conductive polymers such as polyaniline and polythiophene are preferably used.
  • the conductive polymer those soluble in an organic solvent, water-soluble and water-dispersible can be appropriately used, but a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used.
  • the water-soluble conductive polymer or the water-dispersible conductive polymer can be prepared as an aqueous solution or an aqueous dispersion of the coating liquid when forming the antistatic layer, the coating liquid does not need to use a non-aqueous organic solvent, This is because the deterioration of the optical film substrate due to the solvent can be suppressed.
  • the aqueous solution or aqueous dispersion may contain an aqueous solvent in addition to water.
  • alcohols such as -propanol, 2-methyl-1-butanol, n-hexanol and cyclohexanol.
  • the water-soluble conductive polymer or water-dispersible conductive polymer such as polyaniline or polythiophene preferably has a hydrophilic functional group in the molecule.
  • the hydrophilic functional group include a sulfone group, an amino group, an amide group, an imino group, a quaternary ammonium salt group, a hydroxyl group, a mercapto group, a hydrazino group, a carboxyl group, a sulfate ester group, a phosphate ester group, or a salt thereof.
  • Etc By having a hydrophilic functional group in the molecule, it becomes easy to be dissolved in water or easily dispersed in water in the form of fine particles, so that the water-soluble conductive polymer or the water-dispersible conductive polymer can be easily prepared.
  • Examples of commercially available water-soluble conductive polymers include polyaniline sulfonic acid (manufactured by Mitsubishi Rayon Co., Ltd., weight average molecular weight of 150,000 by polystyrene conversion) and the like.
  • Examples of commercially available water-dispersible conductive polymers include polythiophene-based conductive polymers (trade name, Denatron series, manufactured by Nagase Chemtech).
  • a binder component may be added together with the antistatic agent for the purpose of improving the film forming property of the antistatic agent, the adhesion to the optical film, and the like.
  • the antistatic agent is a water-based conductive polymer or water-dispersible conductive polymer aqueous material
  • a water-soluble or water-dispersible binder component is used.
  • the binder oxazoline group-containing polymer, polyurethane resin, polyester resin, acrylic resin, polyether resin, cellulose resin, polyvinyl alcohol resin, epoxy resin, polyvinylpyrrolidone, polystyrene resin, polyethylene glycol, Examples include pentaerythritol. Polyurethane resin, polyester resin, and acrylic resin are particularly preferable. These binders may be used alone or in combination of two or more as appropriate for their application.
  • the amount of the antistatic agent and the binder used depends on their types, but it is preferable to control the surface resistance value of the obtained conductive layer to be 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ .
  • ⁇ Analyzer HLC-8120GPC manufactured by Tosoh Corporation ⁇ Column: manufactured by Tosoh Corporation, G7000H XL + GMH XL + GMH XL ⁇ Column size: Each 7.8 mm ⁇ 30 cm, total 90 cm ⁇ Column temperature: 40°C ⁇ Flow rate: 0.8 mL/min ⁇ Injection volume: 100 ⁇ L ⁇ Eluent: Tetrahydrofuran ⁇ Detector: Differential refractometer (RI) ⁇ Standard sample: polystyrene
  • Alcohol polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • aqueous solution containing the product name “Gosephimmer Z200”) in a ratio of 9:1 was applied and dried at 25° C. to form a PVA-based resin layer having a thickness of 11 ⁇ m to prepare a laminate.
  • the obtained laminate was uniaxially stretched by 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 120° C. (in-air auxiliary stretching treatment).
  • the laminated body was immersed in an insolubilizing bath having a liquid temperature of 30° C. (boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (insolubilization treatment).
  • the polarizing plate was immersed in a dyeing bath having a liquid temperature of 30° C. while adjusting the iodine concentration and the immersion time so that the polarizing plate had a predetermined transmittance.
  • a dyeing bath having a liquid temperature of 30° C.
  • iodine concentration 0.2 part by weight was added to 100 parts by weight of water, and 1.0 part by weight of potassium iodide was added, and the resultant was immersed in an aqueous iodine solution for 60 seconds (dyeing treatment). .. Then, it was immersed for 30 seconds in a crosslinking bath at a liquid temperature of 30° C.
  • Forming material A 75% ethyl acetate solution of urethane prepolymer consisting of tolylene diisocyanate (TDI) and trimethylolpropane (TMP) as a solution of urethane prepolymer (a) (Tosoh Corporation, trade name "Coronate L”) was used.
  • TTI tolylene diisocyanate
  • TMP trimethylolpropane
  • Forming material B Dioctyl tin dilaurate type catalyst (manufactured by Tokyo Fine Chemical Co., Ltd., trade name) 0.1 part of "Enbilizer OL-1" was added, and a urethane prepolymer coating solution was prepared with methyl isobutyl ketone as a solvent to a solid content concentration of 10%.
  • Forming material C 80 parts of urethane acrylate resin (manufactured by Nippon Gosei Co., Ltd., product name "Shikou UV-1700"), 20 parts of N-hydroxyethylacrylamide (manufactured by Kojinsha, trade name "HEAA”), and photopolymerization start 3 parts of an agent (IRGACURE 907, manufactured by BASF) was added, and a urethane acrylate coating solution was prepared with methyl isobutyl ketone as a solvent to a solid content concentration of 10%.
  • urethane acrylate resin manufactured by Nippon Gosei Co., Ltd., product name "Shikou UV-1700
  • HEAA N-hydroxyethylacrylamide
  • HEAA photopolymerization start 3 parts of an agent (IRGACURE 907, manufactured by BASF) was added, and a urethane acrylate coating solution was prepared with methyl isobutyl ketone as a solvent to
  • Forming material D 97.0 parts of methyl methacrylate, 3.0 parts of the monomer represented by the general formula (1) (monomer of the general formula (1e)), polymerization initiator (2,2'- 0.2 part of azobis(isobutyronitrile) was dissolved in 200 parts of toluene. Then, a polymerization reaction was carried out for 5 hours while heating at 70° C. in a nitrogen atmosphere to obtain a polymer (a) (solid content concentration: 33% by weight). The weight average molecular weight of the obtained polymer (a) was 85,000.
  • Forming material E Polyvinyl alcohol resin having a degree of polymerization of 2500 and a degree of saponification of 99.0% (trade name: JC-25, manufactured by Japan Museum Poval Co., Ltd.) is purely dissolved to prepare an aqueous solution having a solid content concentration of 4% by weight. Prepared.
  • Example 1 (Preparation of acrylic polymer (A)) In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 96.2 parts of butyl acrylate, 3 parts of N-vinyl-2-pyrrolidone, 0.5 part of 4-hydroxybutyl acrylate, acrylic A monomer mixture containing 0.3 parts of acid was charged. Further, with respect to 100 parts of the monomer mixture (solid content), 0.1 part of 2,2′-azobisisobutyronitrile as a polymerization initiator was charged together with 100 parts of ethyl acetate, and nitrogen gas was added with gentle stirring.
  • ⁇ Preparation of one-sided protective polarizing film> The transparent protective film (acrylic) was laminated on the surface of the polarizer A of the optical film laminate while applying the ultraviolet curable adhesive a so that the thickness of the cured adhesive layer was 1 ⁇ m. After that, ultraviolet rays were irradiated as active energy rays to cure the adhesive. Ultraviolet irradiation is performed using a gallium-encapsulated metal halide lamp, irradiation device: Fusion UV Systems, Inc. Light HAMMER10, bulb: V bulb, peak illuminance: 1600 mW/cm 2 , integrated irradiation amount 1000/mJ/cm 2 (wavelength 380 to 440 nm).
  • the amorphous PET substrate was peeled off to prepare a one-sided protective polarizing film using a thin polarizer.
  • the optical characteristics of the obtained one-sided protective polarizing film were a single substance transmittance of 42.8% and a polarization degree of 99.99%.
  • ⁇ Preparation of transparent protective layer-attached protective film> By applying the transparent layer forming material A on the surface of the polarizer of the one-sided protective polarizing film (the surface of the polarizer on which the transparent protective film is not provided) with a bar coater, heat treatment is performed at 60° C. for 5 minutes. Then, a urethane resin layer having a thickness of 3 ⁇ m was formed.
  • Example 1 As shown in Table 1, the composition of the monomer mixture used for the preparation of the acrylic polymer (A), the type of the ionic compound (B) used for the preparation of the pressure-sensitive adhesive composition (EMI-FSI or Li-TFSI) or the compounding ratio thereof, the thickness of the pressure-sensitive adhesive layer, the type or thickness of the material for forming the transparent layer, and the presence or absence of the conductive layer were changed as shown in Table 1 and in the same manner as in Example 1. A one-sided protective polarizing film with a transparent layer and a one-sided protective polarizing film with an adhesive layer were prepared.
  • Table 1 the composition of the monomer mixture used for the preparation of the acrylic polymer (A), the type of the ionic compound (B) used for the preparation of the pressure-sensitive adhesive composition (EMI-FSI or Li-TFSI) or the compounding ratio thereof, the thickness of the pressure-sensitive adhesive layer, the type or thickness of the material for forming the transparent layer, and the presence or absence of the conductive layer were changed as shown in Table 1
  • the transparent layer of Example 5 was obtained by applying the transparent layer forming material B to the surface of the polarizer of the one-sided protective polarizing film (polarizer surface not provided with the transparent protective film) with a bar coater, The heat treatment was performed at 60° C. for 12 hours to form a urethane resin layer having a thickness of 3 ⁇ m.
  • the transparent layer of Example 6 was formed by applying the forming agent C to the surface of the polarizer of the one-sided protective polarizing film (the surface of the polarizer not provided with the transparent protective film) with a bar coater, and then applying 90 Heated at 0°C for 1 minute.
  • the coating layer was irradiated with ultraviolet rays having a cumulative light intensity of 300 mJ/cm 2 with a high pressure mercury lamp to form a urethane acrylate resin layer having a thickness of 1 ⁇ m.
  • the transparent layer forming material D was applied by a bar coater to the polarizer surface of the one-sided protective polarizing film (polarizer surface on which the transparent protective film was not provided). After that, heat treatment was performed at 60° C. for 2 minutes to form a transparent layer having a thickness of 0.5 ⁇ m.
  • the transparent layer of Comparative Example 2 was formed by coating the surface of the polarizer of the one-sided protective polarizing film (the surface of the polarizer on which the transparent protective film was not provided) with the forming agent E using a bar coater, and then at 60° C. It was carried out by heating for 3 minutes to form a polyvinyl alcohol resin layer having a thickness of 1.5 ⁇ m. In Comparative Examples 1 and 3, no transparent layer was formed.
  • Example 15 the conductive layer-forming coating liquid was applied onto the transparent layer of the transparent protective film with transparent layer so that the thickness after drying would be 0.06 ⁇ m, and dried at 80° C. for 2 minutes. A conductive layer was formed.
  • the obtained conductive layer contained 8% by weight and 50% by weight of a thiophene-based polymer and an oxazoline group-containing acrylic polymer, respectively.
  • the surface resistance value of the conductive layer was measured on the conductive layer side surface of the polarizing film with the conductive layer and the transparent layer before forming the pressure-sensitive adhesive layer. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical Analytech.
  • the surface resistance value of the pressure-sensitive adhesive layer surface of Example 15 is a value measured from the surface of the conductive pressure-sensitive adhesive layer in the state where both the conductive layer and the conductive pressure-sensitive adhesive layer are present.
  • the variation ratio (b/a) in Table 1 is a value calculated from the "initial" surface resistance value (a) and the "after humidification” surface resistance value (b) (rounded to two decimal places). Value).
  • BA is butyl acrylate
  • NVP is N-vinyl-2-pyrrolidone
  • HBA is 4-hydroxybutyl acrylate
  • AA is acrylic acid
  • EMI-FSI is ethylmethylimidazolium bis(fluorosulfonylimide)
  • Li-TFSI represents bis(trifluoromethanesulfonyl)imide lithium.
  • the initial surface resistance value of the pressure-sensitive adhesive layer was lowered by adding an ionic compound to the acrylic polymer. Even when set, in the example in which the one-sided protective polarizing film has a predetermined transparent layer, it is possible to control the variation ratio of the surface resistance value of the pressure-sensitive adhesive layer after humidification to 10 or less, and increase the surface resistance value. You can see that it can be suppressed.
  • the variation ratio of the surface resistance value of the pressure-sensitive adhesive layer is small, it is possible to maintain the surface resistance value within a desired range even after humidification, and it is possible to maintain the touch panel sensitivity well, Furthermore, the ESD test is good, and it is possible to suppress static electricity unevenness.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

Panneau à cristaux liquides à fonction de détection tactile comprenant un premier film polarisant disposé sur le côté de visualisation d'une cellule à cristaux liquides ayant une fonction de détection d'effleurement programmée, un second film polarisant disposé sur le côté opposé au côté de visualisation et une première couche adhésive disposée entre le premier film polarisant et la cellule à cristaux liquides. Le premier film polarisant a un film protecteur transparent sur une seule surface d'un élément polarisant et l'autre surface est disposée sur la première couche adhésive, une couche transparente se situe entre elles. La première couche adhésive est formée à partir d'une composition adhésive qui contient (A) un polymère (méth)acrylique et (B) un composé ionique, a un faible changement de valeur de résistance de surface même dans un environnement humidifié et satisfait une fonction antistatique stable dans un environnement humidifié.
PCT/JP2019/046798 2018-11-29 2019-11-29 Panneau à cristaux liquides à fonction de détection tactile, dispositif d'affichage à cristaux liquides et film polarisant à couche adhésive WO2020111236A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980067298.9A CN112888994A (zh) 2018-11-29 2019-11-29 带触摸传感功能的液晶面板、液晶显示装置及带粘合剂层的偏振膜
KR1020217011177A KR20210095853A (ko) 2018-11-29 2019-11-29 터치 센싱 기능을 갖는 액정 패널, 액정 표시 장치 및 점착제층을 구비한 편광 필름

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018-223647 2018-11-29
JP2018223647 2018-11-29
JP2019214299A JP6748279B2 (ja) 2018-11-29 2019-11-27 タッチセンシング機能付液晶パネル、液晶表示装置および粘着剤層付き偏光フィルム
JP2019-214299 2019-11-27

Publications (1)

Publication Number Publication Date
WO2020111236A1 true WO2020111236A1 (fr) 2020-06-04

Family

ID=70852348

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/046798 WO2020111236A1 (fr) 2018-11-29 2019-11-29 Panneau à cristaux liquides à fonction de détection tactile, dispositif d'affichage à cristaux liquides et film polarisant à couche adhésive

Country Status (1)

Country Link
WO (1) WO2020111236A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009119664A1 (fr) * 2008-03-28 2009-10-01 ソニー株式会社 Dispositif d'affichage à détecteur tactile
WO2010064551A1 (fr) * 2008-12-05 2010-06-10 株式会社クラレ Composition d'adhésif autocollant pour film optique
JP2014081935A (ja) * 2012-10-15 2014-05-08 Beijing Boe Optoelectronics Technology Co Ltd 静電容量式インセルタッチパネル及びディスプレイデバイス
JP2014529639A (ja) * 2011-08-09 2014-11-13 オルネクス ベルギウム ソシエテ アノニム 水性放射線硬化性コーティング組成物
JP2017075986A (ja) * 2015-10-13 2017-04-20 株式会社サンリッツ 粘着剤層付き偏光板及びその製造方法、その製造に用いる活性エネルギー線硬化性高分子組成物並びに液晶表示装置
WO2018181415A1 (fr) * 2017-03-28 2018-10-04 日東電工株式会社 Film polarisant avec couche adhésive ajoutée, film polarisant à couche adhésive ajoutée destiné à un panneau à cristaux liquides à cellules, panneau à cristaux liquides à cellules, et dispositif d'affichage à cristaux liquides

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009119664A1 (fr) * 2008-03-28 2009-10-01 ソニー株式会社 Dispositif d'affichage à détecteur tactile
WO2010064551A1 (fr) * 2008-12-05 2010-06-10 株式会社クラレ Composition d'adhésif autocollant pour film optique
JP2014529639A (ja) * 2011-08-09 2014-11-13 オルネクス ベルギウム ソシエテ アノニム 水性放射線硬化性コーティング組成物
JP2014081935A (ja) * 2012-10-15 2014-05-08 Beijing Boe Optoelectronics Technology Co Ltd 静電容量式インセルタッチパネル及びディスプレイデバイス
JP2017075986A (ja) * 2015-10-13 2017-04-20 株式会社サンリッツ 粘着剤層付き偏光板及びその製造方法、その製造に用いる活性エネルギー線硬化性高分子組成物並びに液晶表示装置
WO2018181415A1 (fr) * 2017-03-28 2018-10-04 日東電工株式会社 Film polarisant avec couche adhésive ajoutée, film polarisant à couche adhésive ajoutée destiné à un panneau à cristaux liquides à cellules, panneau à cristaux liquides à cellules, et dispositif d'affichage à cristaux liquides

Similar Documents

Publication Publication Date Title
JP6320358B2 (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置
WO2020111232A1 (fr) Film polarisant avec couche adhésive et dispositif d'affichage d'image
JP6748279B2 (ja) タッチセンシング機能付液晶パネル、液晶表示装置および粘着剤層付き偏光フィルム
JP7372824B2 (ja) 粘着剤層付き偏光フィルム及び画像表示装置
WO2020188872A1 (fr) Film polarisant contenant une couche adhésive, écran d'affichage d'image et dispositif d'affichage d'image
JP7467060B2 (ja) 粘着剤層付偏光フィルム、画像表示パネル及び画像表示装置
CN112840242B (zh) 带粘合剂层的偏振膜及图像显示装置
JP7481101B2 (ja) 粘着剤層付偏光フィルム、画像表示パネル及び画像表示装置
WO2020188871A1 (fr) Film polarisant avec une couche adhésive, écran d'affichage d'image et dispositif d'affichage d'image
JP6563566B2 (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置
WO2020111236A1 (fr) Panneau à cristaux liquides à fonction de détection tactile, dispositif d'affichage à cristaux liquides et film polarisant à couche adhésive
JP6377292B1 (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置
WO2020111235A1 (fr) Film polarisant à couche adhésive et dispositif d'affichage d'image
CN113348409A (zh) 液晶面板及液晶显示装置
TWI839423B (zh) 附黏著劑層之偏光薄膜及影像顯示裝置
JP2019200423A (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置
CN113348410A (zh) 液晶面板及液晶显示装置
JP2018141990A (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置
JP2018141988A (ja) タッチセンシング機能付液晶パネルおよび液晶表示装置

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: 19891443

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19891443

Country of ref document: EP

Kind code of ref document: A1