WO2018181479A1 - インセル型液晶パネルおよび液晶表示装置 - Google Patents
インセル型液晶パネルおよび液晶表示装置 Download PDFInfo
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- WO2018181479A1 WO2018181479A1 PCT/JP2018/012775 JP2018012775W WO2018181479A1 WO 2018181479 A1 WO2018181479 A1 WO 2018181479A1 JP 2018012775 W JP2018012775 W JP 2018012775W WO 2018181479 A1 WO2018181479 A1 WO 2018181479A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J139/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
- C09J139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
- C09J139/08—Homopolymers or copolymers of vinyl-pyridine
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- 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
- G06F3/0412—Digitisers structurally integrated in a display
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- 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
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
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- 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
- G02F2202/00—Materials and properties
- G02F2202/22—Antistatic materials or arrangements
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- 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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
Definitions
- the present invention relates to an in-cell type liquid crystal cell in which a touch sensing function is incorporated in the liquid crystal cell and an in-cell type liquid crystal panel having a polarizing film with an adhesive layer on the viewing side of the in-cell type liquid crystal cell. Further, the present invention relates to a liquid crystal display device using the liquid crystal panel.
- the liquid crystal display device with a touch sensing function using the in-cell type liquid crystal panel of the present invention can be used as various input display devices such as mobile devices.
- a liquid crystal display device has a polarizing film bonded to both sides of a liquid crystal cell via an adhesive layer due to its image forming method.
- a liquid crystal display device in which a touch panel is mounted on a display screen has been put into practical use.
- touch panels such as a capacitance type, a resistance film type, an optical method, an ultrasonic method, and an electromagnetic induction type, but the capacitance type is increasingly adopted.
- a liquid crystal display device with a touch sensing function that incorporates a capacitance sensor as a touch sensor unit has been used.
- the release film is peeled off from the pressure-sensitive adhesive layer of the polarizing film with the pressure-sensitive adhesive layer.
- Static electricity is generated by peeling.
- Static electricity is also generated when the surface protective film of the polarizing film attached to the liquid crystal cell is peeled off or when the surface protective film of the cover window is peeled off.
- the static electricity generated in this way affects the alignment of the liquid crystal layer inside the liquid crystal display device, leading to defects. Generation of static electricity can be suppressed, for example, by forming an antistatic layer on the outer surface of the polarizing film.
- the capacitance sensor in the liquid crystal display device with a touch sensing function detects a weak capacitance formed by the transparent electrode pattern and the finger when the finger of the user approaches the surface.
- 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, the sensor electrode capacitance becomes unstable, and the touch panel sensitivity Lowers, causing malfunction.
- it is required to suppress the generation of static electricity and to suppress 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 1 According to the polarizing film having the antistatic layer described in Patent Document 1, it is possible to suppress the generation of static electricity to some extent. However, in Patent Document 1, since the place where the antistatic layer is disposed is farther from the fundamental position where static electricity is generated, it is not as effective as when an antistatic function is imparted to the adhesive layer. In addition, in the liquid crystal display device with a touch sensing function, it is possible to provide conductivity from the side surface by providing a conductive structure on the side surface of the polarizing film, but when the antistatic layer is thin, Since the contact area is small, it has been found that sufficient conductivity cannot be obtained and poor conduction occurs. On the other hand, it was found that when the antistatic layer becomes thicker, the touch sensor sensitivity decreases.
- the antistatic layer provided on the outer surface of the polarizing film does not provide sufficient conductivity due to the absence of adhesiveness with the conductive structure provided on the side surface in a humidified or humidified environment (after humidification or heating reliability test). It turns out that a defect occurs.
- the pressure-sensitive adhesive layer provided with an antistatic function is more effective in suppressing static electricity generation and preventing static electricity unevenness than the antistatic layer provided on the polarizing film.
- the importance of the antistatic function of the pressure-sensitive adhesive layer has been emphasized, and it has been found that the touch sensor sensitivity decreases when the conductive function of the pressure-sensitive adhesive layer is increased. In particular, it has been found that the touch sensor sensitivity decreases in the liquid crystal display device with a touch sensing function.
- the antistatic agent blended in the pressure-sensitive adhesive layer in order to enhance the conductive function is segregated at the interface with the polarizing film in the humidified environment (after the humidification reliability test) or at the interface on the viewing side of the liquid crystal cell. It turned out that durability was not enough.
- the present invention is an in-cell type liquid crystal panel having an in-cell type liquid crystal cell and a polarizing film with a pressure-sensitive adhesive layer applied to the viewing side thereof, having a good antistatic function, and touch sensor sensitivity in a humidified environment. It is an object of the present invention to provide an in-cell type liquid crystal panel that can satisfy the conduction reliability and durability.
- Another object of the present invention is to provide an in-cell type liquid crystal panel using the in-cell type liquid crystal panel, and further to provide a liquid crystal display device using the liquid crystal panel.
- the present invention provides a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in the absence of an electric field, a first transparent substrate and a second transparent substrate that sandwich the liquid crystal layer on both sides, and the first transparent substrate and the second transparent substrate.
- An in-cell type liquid crystal cell having a touch sensing electrode portion related to a touch sensor and a touch driving function between the substrate and a substrate;
- An in-cell type liquid crystal panel having a pressure-sensitive adhesive layer-attached polarizing film disposed on the first transparent substrate side on the viewing side of the in-cell type liquid crystal cell via the first pressure-sensitive adhesive layer without a conductive layer,
- the polarizing film with the pressure-sensitive adhesive layer has a surface-treated layer, a first polarizing film, and a first pressure-sensitive adhesive layer in this order, or a surface-treated layer, a first polarizing film, an anchor layer, and a first pressure-sensitive adhesive layer.
- the in-cell type liquid crystal panel is characterized in that at least one layer selected from the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer contains an antistatic agent.
- a conductive structure can be provided on a side surface of a layer containing the antistatic agent among the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer of the polarizing film with the pressure-sensitive adhesive layer.
- At least one layer selected from the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer has the following surface resistance value
- the surface treatment layer has a surface resistance value of 1 ⁇ 10 7 to 1 ⁇ 10 11 ⁇ / ⁇
- the anchor layer has a surface resistance value of 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ / ⁇
- the first pressure-sensitive adhesive layer has a surface resistance value of 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ / ⁇ . Is preferably satisfied.
- the first pressure-sensitive adhesive layer may contain an antistatic agent.
- the antistatic agent is preferably an alkali metal salt and / or an organic cation-anion salt.
- any two or more layers selected from the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer contain an antistatic agent.
- the touch sensing electrode unit may be one disposed between the liquid crystal layer and the first transparent substrate or the second transparent substrate.
- the touch sensing electrode part may be one disposed between the liquid crystal layer and the first transparent substrate, and one disposed between the liquid crystal layer and the second transparent substrate. Can be used.
- the touch sensing electrode portion may be formed of a touch sensor electrode and a touch drive electrode.
- the touch sensing electrode unit when the touch sensing electrode unit is disposed between the liquid crystal layer and the first transparent substrate or the second transparent substrate, the touch sensing electrode unit includes a touch sensor electrode and a touch drive.
- An electrode in which electrodes are integrally formed can be used.
- the in-cell type liquid crystal panel may have a second polarizing film disposed on the second transparent substrate side of the in-cell type liquid crystal cell via a second pressure-sensitive adhesive layer.
- the present invention also relates to a liquid crystal display device having the in-cell type liquid crystal panel.
- the polarizing film with a pressure-sensitive adhesive layer on the viewing side is provided with an anti-static function in at least one layer selected from a surface treatment layer, an anchor layer, and a pressure-sensitive adhesive layer.
- the side surface can be in contact with the conductive structure, and a sufficient contact area can be secured. Therefore, the conduction at the side surface of at least one layer in the polarizing film with the pressure-sensitive adhesive layer can be secured, the occurrence of uneven static electricity due to poor conduction can be suppressed, and the conduction reliability in a humidified environment can also be satisfied.
- the anchor layer and the pressure-sensitive adhesive layer are provided with an antistatic function, conduction is more effectively ensured and static electricity unevenness due to poor conduction is suppressed. It is possible to satisfy the reliability of conduction in a humidified environment.
- the surface resistance value of at least one layer selected from a surface treatment layer, an anchor layer and a pressure-sensitive adhesive layer can be controlled within a predetermined range.
- the polarizing film with the pressure-sensitive adhesive layer of the present invention is at least one layer in the polarizing film with the pressure-sensitive adhesive layer while controlling the sensitivity of the touch sensor so as not to decrease or the durability in a humidified environment to deteriorate. It is possible to provide a predetermined antistatic function by reducing the surface resistance value. Therefore, the polarizing film with a pressure-sensitive adhesive layer of the present invention can satisfy touch sensor sensitivity and durability in a humidified environment while having a good antistatic function.
- the polarizing film A with the pressure-sensitive adhesive layer used on the viewing side of the in-cell type liquid crystal panel of the present invention has the surface treatment layer 4, the first polarizing film 1, and the first pressure-sensitive adhesive layer 2 in this order, or the surface treatment layer. 4. It has the 1st polarizing film 1, the anchor layer 3, and the 1st adhesive layer 2 in this order.
- FIG. 1 shows a case where the surface treatment layer 4, the first polarizing film 1, the anchor layer 3, and the first pressure-sensitive adhesive layer 2 are provided in this order.
- the polarizing film A with an adhesive layer of the present invention is disposed on the transparent substrate 41 side of the viewing side of the in-cell type liquid crystal cell B, for example, in FIGS.
- a separator can be provided on the first pressure-sensitive adhesive layer 2 of the polarizing film A with the pressure-sensitive adhesive layer of the present invention, and a surface protective film can be provided on the surface treatment layer 4.
- the polarizing film with a pressure-sensitive adhesive layer for a liquid crystal cell with a built-in touch sensing function has a surface resistance value in order to provide conductivity in at least one layer selected from the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer. Is controlled.
- the surface resistance value may be controlled by at least one layer, but from the viewpoint of ensuring adhesion and contact area with the conductive structure provided on the side surface in a humidified or heated environment, at least two layers, In particular, the surface resistance value is preferably controlled in the anchor layer 3 and the first pressure-sensitive adhesive layer 2.
- the thickness of the anchor layer 3 is preferably 0.01 to 0.5 ⁇ m, and preferably 0.01 to 0.2 ⁇ m, from the viewpoint of the stability of the surface resistance value and the adhesion to the pressure-sensitive adhesive layer. More preferably, it is 0.01 to 0.1 ⁇ m.
- the surface resistance value of the anchor layer 3 is preferably 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ from the viewpoint of an antistatic function and touch sensor sensitivity, and is preferably 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ . / ⁇ is preferable, and 1 ⁇ 10 8 to 1 ⁇ 10 10 ⁇ is more preferable.
- the thickness of the first pressure-sensitive adhesive layer 2 is preferably 5 to 100 ⁇ m, preferably 5 to 50 ⁇ m, and more preferably 10 to 35 ⁇ m, from the viewpoint of ensuring durability and ensuring a contact area with the conductive structure on the side surface. Is preferred.
- the surface resistance value of the first pressure-sensitive adhesive layer 2 is 1 ⁇ 10 8 to 1 ⁇ 10 from the viewpoint of an antistatic function and touch sensor sensitivity. It is preferably 12 ⁇ / ⁇ , preferably 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ / ⁇ , more preferably 1 ⁇ 10 8 to 1 ⁇ 10 10 ⁇ .
- the surface resistance value of the surface treatment layer 4 is 1 ⁇ 10 7 to 1 ⁇ 10 11 ⁇ / ⁇ from the viewpoint of an antistatic function and touch sensor sensitivity. It is preferably 1 ⁇ 10 7 to 1 ⁇ 10 10 ⁇ / ⁇ , and more preferably 1 ⁇ 10 7 to 1 ⁇ 10 9 ⁇ .
- the surface resistance value on the pressure-sensitive adhesive layer 2 side of the polarizing film A with the pressure-sensitive adhesive layer satisfies the antistatic function and reduces the sensitivity of the touch sensor so as not to decrease the durability in a humidified environment. Further, it is preferably controlled to 1 ⁇ 10 8 to 1 ⁇ 10 11 ⁇ / ⁇ .
- the surface resistance value can be adjusted by controlling the surface resistance value of at least one of the surface treatment layer 4, the anchor layer 3, and the first pressure-sensitive adhesive layer 2, respectively.
- the surface resistance value is preferably 1 ⁇ 10 8 to 6 ⁇ 10 10 ⁇ / ⁇ , and more preferably 1 ⁇ 10 8 to 4 ⁇ 10 10 ⁇ / ⁇ .
- the polarizing film A with an adhesive layer is demonstrated.
- the polarizing film A with an adhesive layer of this invention has the surface treatment layer 4, the 1st polarizing film 1, and the 1st adhesive layer 2 in this order, or the surface treatment layer 4 and the 1st. It has the polarizing film 1, the anchor layer 3, and the 1st adhesive layer 2 in this order.
- the first polarizing film one having a transparent protective film on one side or both sides of a polarizer is generally used.
- the polarizer is not particularly limited, and various types can be used.
- polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films. Examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer composed of a polyvinyl alcohol film and a dichroic substance 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. From the viewpoint of thinning, the thickness is preferably 1 to 7 ⁇ m. Such a thin polarizer is preferable in that the thickness unevenness is small, the visibility is excellent, the dimensional change is small, the durability is excellent, and the thickness of the polarizing film can be reduced.
- thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
- thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- a transparent protective film is bonded to one side of the polarizer by an adhesive layer.
- thermosetting resin such as a system or an ultraviolet curable resin
- One or more kinds of arbitrary appropriate additives may be contained in the transparent protective film.
- the adhesive used for laminating the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and water-based, solvent-based, hot-melt-based, radical curable, and cationic curable types are used. However, water-based adhesives or radical curable adhesives are suitable.
- an antistatic agent is used in at least one of the surface treatment layer, the anchor layer, and the first pressure-sensitive adhesive layer in order to impart conductivity.
- the antistatic agent include materials capable of imparting antistatic properties such as ionic surfactants, conductive polymers, and conductive fine particles.
- an ionic compound can be used as the antistatic agent.
- ionic surfactants include cationic (for example, quaternary ammonium salt type, phosphonium salt type, sulfonium salt type), anionic type (carboxylic acid type, sulfonate type, sulfate type, phosphate type, phosphite type, etc.) , Zwitterionic (sulfobetaine, alkylbetaine, alkylimidazolium betaine, etc.) or nonionic (polyhydric alcohol derivatives, ⁇ -cyclodextrin inclusion compounds, sorbitan fatty acid monoesters / diesters, polyalkylene oxide derivatives, amines)
- Various surfactants such as oxides).
- the conductive polymer examples include polyaniline-based, polythiophene-based, polypyrrole-based, and polyquinoxaline-based polymers.
- polyaniline, polythiophene, which easily becomes a water-soluble conductive polymer or a water-dispersible conductive polymer. Etc. are preferably used.
- Polythiophene is particularly preferable.
- the conductive fine particles include metal oxides such as tin oxide, antimony oxide, indium oxide, and zinc oxide. Of these, tin oxide is preferable.
- tin oxide-based materials include, in addition to tin oxide, antimony-doped tin oxide, indium-doped tin oxide, aluminum-doped tin oxide, tungsten-doped tin oxide, titanium oxide-cerium oxide-tin oxide composite, titanium oxide- Examples thereof include a composite of tin oxide.
- the average particle size of the fine particles is about 1 to 100 nm, preferably 2 to 50 nm.
- antistatic agents other than the above, acetylene black, ketjen black, natural graphite, artificial graphite, titanium black, cationic type (quaternary ammonium salt etc.), amphoteric ion type (betaine compound etc.), anionic type (sulfonic acid) Salt or the like) or nonionic type (glycerin etc.) monomer-containing homopolymer or copolymer of the monomer and other monomers, quaternary ammonium base acrylate or methacrylate Examples thereof include a polymer having ionic conductivity such as a polymer having a site derived from; a type of permanent antistatic agent in which a hydrophilic polymer such as a polyethylene methacrylate copolymer is alloyed with an acrylic resin or the like.
- an alkali metal salt and / or an organic cation-anion salt can be preferably used.
- an organic salt or inorganic salt of an alkali metal can be used.
- organic cation-anion salt refers to an organic salt whose cation part is composed of an organic substance, and the anion part may be an organic substance or an inorganic substance. There may be. “Organic cation-anion salt” is also called an ionic liquid or ionic solid.
- alkali metal salt examples include lithium, sodium, and potassium ions. Of these alkali metal ions, lithium ions are preferred.
- the anion part of the alkali metal salt may be composed of an organic material or an inorganic material.
- Examples of the anion part 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 ⁇ , and C 4 F 9 SO 3.
- an anion moiety containing a fluorine atom is preferably used because an ionic compound having good ion dissociation properties can be obtained.
- the anion part constituting the inorganic salt includes 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 ⁇ , and the like are used.
- (perfluoroalkylsulfonyl) imide represented by the general formula (1) such as (CF 3 SO 2 ) 2 N ⁇ , (C 2 F 5 SO 2 ) 2 N ⁇ , etc. is preferable, (Trifluoromethanesulfonyl) imide represented by CF 3 SO 2 ) 2 N ⁇ is preferable.
- alkali metal organic salt examples include sodium acetate, sodium alginate, sodium lignin sulfonate, sodium toluenesulfonate, LiCF 3 SO 3 , Li (CF 3 SO 2 ) 2 N, 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, 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 Fluorine-containing lithium imide salt is more preferably equal, particularly (perfluoroal
- examples of the alkali metal inorganic salt 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 composed of an organic substance.
- the cation component specifically, pyridinium cation, piperidinium cation, pyrrolidinium cation, cation having pyrroline skeleton, cation having pyrrole skeleton, imidazolium cation, tetrahydropyrimidinium cation, dihydropyrimidinium cation, Examples include pyrazolium cation, pyrazolinium cation, tetraalkylammonium cation, trialkylsulfonium cation, and 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.
- ionic compound examples include inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, and ammonium sulfate in addition to the alkali metal salt and organic cation-anion salt. . These ionic compounds can be used alone or in combination.
- the anchor layer When imparting conductivity to the anchor layer, as described above, the anchor layer has a thickness of 0.01 to 0.5 ⁇ m and a surface resistance value of 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ . It is preferable to be formed as follows.
- the conductive anchor layer can be formed from various antistatic agent compositions.
- the antistatic agent for forming the anchor layer among the above examples, ionic surfactants, conductive polymers, conductive fine particles, and the like are preferable.
- conductive polymers are preferably used from the viewpoints of optical properties, appearance, antistatic effect and antistatic effect when heated and humidified.
- conductive polymers such as polyaniline and polythiophene are preferably used.
- a conductive polymer that is soluble in an organic solvent, water-soluble, and water-dispersible can be used as appropriate, but a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used.
- a water-soluble conductive polymer or a water-dispersible conductive polymer can be prepared as an aqueous solution or aqueous dispersion as the coating solution for forming the antistatic layer, and the coating solution does not need to use a non-aqueous organic solvent.
- the aqueous solution or aqueous dispersion may contain an aqueous solvent in addition to water.
- an aqueous solvent for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-amyl alcohol, isoamyl alcohol, sec-amyl alcohol, tert-amyl alcohol, 1-ethyl-1
- 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.
- hydrophilic functional groups include sulfone groups, amino groups, amide groups, imino groups, quaternary ammonium bases, hydroxyl groups, mercapto groups, hydrazino groups, carboxyl groups, sulfate ester groups, phosphate ester groups, or salts thereof.
- Etc By having a hydrophilic functional group in the molecule, it becomes easy to dissolve in water or to be easily dispersed in water as fine particles, and the water-soluble conductive polymer or 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 in terms of polystyrene).
- Examples of commercially available water-dispersible conductive polymers include polythiophene conductive polymers (manufactured by Nagase Chemtech, trade name, Denatron series).
- a binder component can be added together with the antistatic agent for the purpose of improving the film forming property of the antistatic agent and the adhesion to the optical film.
- the antistatic agent is a water-soluble conductive polymer or water-based material of a water-dispersible conductive polymer
- a water-soluble or water-dispersible binder component is used.
- binders include oxazoline group-containing polymers, polyurethane resins, polyester resins, acrylic resins, polyether resins, cellulose resins, polyvinyl alcohol resins, epoxy resins, polyvinyl pyrrolidone, polystyrene resins, polyethylene glycols, And pentaerythritol. Particularly preferred are polyurethane resins, polyester resins and acrylic resins. These binders can be used alone or in combination of two or more as appropriate.
- the amount of the antistatic agent and the binder used depends on the kind thereof, but is preferably controlled so that the surface resistance value of the obtained anchor layer is 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ .
- the first pressure-sensitive adhesive layer When imparting conductivity to the first pressure-sensitive adhesive layer, the first pressure-sensitive adhesive layer has a thickness of 5 to 100 ⁇ m and a surface resistance value of 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ as described above. It is preferable to form such that The conductive first pressure-sensitive adhesive layer can be formed from a composition in which an antistatic agent is blended with various pressure-sensitive adhesives.
- pressure-sensitive adhesives can be used as the pressure-sensitive adhesive forming the first pressure-sensitive adhesive layer.
- rubber-based pressure-sensitive adhesives acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, and vinyl alkyl ether-based pressure-sensitive adhesives.
- Agents polyvinyl pyrrolidone adhesives, polyacrylamide adhesives, cellulose adhesives, and the like.
- An adhesive base polymer is selected according to the type of the adhesive.
- acrylic pressure-sensitive adhesives are preferably used because they are excellent in optical transparency, exhibit appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and are excellent in weather resistance, heat resistance, and the like.
- the acrylic pressure-sensitive adhesive contains a (meth) acrylic polymer as a base polymer.
- the (meth) acrylic polymer usually contains an alkyl (meth) acrylate as a main component as a monomer unit.
- (Meth) acrylate refers to acrylate and / or methacrylate, and (meth) of the present invention has the same meaning.
- alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer
- alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer
- alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer
- alkyl (meth) acrylates containing aromatic rings such as phenoxyethyl (meth) acrylate and benzyl (meth) acrylate are used from the viewpoints of adhesive properties, durability, retardation adjustment, refractive index adjustment, and the like. be able to.
- (meth) acrylic polymer one or more having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
- a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
- Such copolymerized monomers include, for example, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, (meth) acrylic acid 6 Hydroxyl-containing monomers such as hydroxyhexyl, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and (4-hydroxymethylcyclohexyl) -methyl acrylate Carboxyl group-containing monomers such as (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride Monomer-containing monomer with acrylic acid caprolactone Sulfuric acids such as styrene sulf
- (N-substituted) amides such as (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, etc.
- Monomer (meth) acrylic acid aminoethyl, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid t-butylaminoethyl, etc.
- (meth) acrylic alkylaminoalkyl monomers examples include itaconimide monomers such as imide, N-butyl itaconimide, N-octyl it
- Further modifying monomers include vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, vinyl morpholine, N- Vinyl monomers such as vinylcarboxylic acid amides, styrene, ⁇ -methylstyrene, N-vinylcaprolactam; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; (Meth) acrylic acid polyethylene glycol, (meth) acrylic acid polypropylene glycol, (meth) acrylic acid methoxyethylene glycol, (meth) acrylic acid methoxy Glycol acrylic ester monomers such as propylene glycol; acrylic ester monomers such as tetrahydr
- examples of copolymerizable monomers other than the above include silane-based monomers containing silicon atoms.
- examples of the silane monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8-vinyloctyltrimethoxysilane.
- copolymer monomers examples include 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 (Meth) acryloyl such as esterified product of (meth) acrylic acid and polyhydric alcohol such as caprolactone-modified dipentaerythritol hexa (meth) acrylate Groups such as polyfunctional
- polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, or the like to which two or more saturated double bonds have been added can also be used.
- the (meth) acrylic polymer has alkyl (meth) acrylate as a main component in the weight ratio of all constituent monomers, and the ratio of the copolymerizable monomer in the (meth) acrylic polymer is not particularly limited, but the copolymer
- the ratio of the monomer is preferably about 0 to 20%, about 0.1 to 15%, and more preferably about 0.1 to 10% in the weight ratio of all the constituent monomers.
- hydroxyl group-containing monomers and carboxyl group-containing monomers are preferably used from the viewpoint of adhesion and durability.
- a hydroxyl group-containing monomer and a carboxyl group-containing monomer can be used in combination.
- These copolymerization monomers serve as reaction points with the crosslinking agent when the pressure-sensitive adhesive composition contains a crosslinking agent. Since a hydroxyl group-containing monomer, a carboxyl group-containing monomer, and the like are rich in reactivity with an intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the resulting pressure-sensitive adhesive layer.
- a hydroxyl group-containing monomer is preferable from the viewpoint of reworkability, and a carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability.
- an amide group-containing monomer is preferably used because it is easy to lower the resistance value and is stable in a humidified environment, and is used in combination with the hydroxyl group-containing monomer and the carboxyl group-containing monomer. can do.
- the proportion is preferably 0.01 to 15% by weight, more preferably 0.03 to 10% by weight, and further preferably 0.05 to 7% by weight.
- the proportion is preferably 0.05 to 10% by weight, more preferably 0.1 to 8% by weight, and further preferably 0.2 to 6% by weight.
- the proportion is preferably 0.1% by weight or more.
- the (meth) acrylic polymer of the present invention usually has a weight average molecular weight in the range of 500,000 to 3,000,000. In view of durability, particularly heat resistance, it is preferable to use those having a weight average molecular weight of 700,000 to 2,700,000. Further, it is preferably 800,000 to 2.5 million. A weight average molecular weight of less than 500,000 is not preferable in terms of heat resistance. On the other hand, if the weight average molecular weight is more than 3 million, a large amount of dilution solvent is required to adjust the viscosity for coating, which is not preferable.
- the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.
- the production of such a (meth) acrylic polymer can be appropriately selected from known production methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations. Further, the (meth) acrylic polymer obtained may be a random copolymer, a block copolymer, a graft copolymer or the like.
- an ionic compound is preferable from the viewpoints of compatibility with the base polymer and transparency of the pressure-sensitive adhesive layer among the above examples.
- an acrylic pressure-sensitive adhesive having a (meth) acrylic polymer as a base polymer it is preferable to use an ionic compound.
- an ionic liquid is preferable from the viewpoint that the resistance value can be easily lowered by addition of a relatively small amount and that the ionic compound is easily stable even in a humidified environment.
- the amount of the pressure-sensitive adhesive and antistatic agent used is controlled so that the surface resistance value of the obtained first pressure-sensitive adhesive layer is 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ / ⁇ , although it depends on the type of the adhesive.
- it is preferably used in the range of 20 parts by weight of an antistatic agent (for example, in the case of an ionic compound) with respect to 100 parts by weight of the base polymer (for example, (meth) acrylic polymer) of the pressure-sensitive adhesive.
- the use of 0.05 parts by weight or more of the antistatic agent is preferable for improving the antistatic performance.
- the antistatic agent (B) is preferably 0.1 parts by weight or more, and more preferably 0.5 parts by weight or more. In order to satisfy the durability, it is preferably used at 20 parts by weight or less, and more preferably at 10 parts by weight or less.
- the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer can contain a crosslinking agent corresponding to the base polymer.
- a crosslinking agent corresponding to the base polymer.
- an organic crosslinking agent or a polyfunctional metal chelate can be used as the crosslinking agent.
- the organic crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, an epoxy crosslinking agent, and an imine crosslinking agent.
- a polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinately bonded to 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, Ti, and the like. Can be mentioned.
- Examples of the atom in the organic compound that is covalently bonded or coordinated 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.
- the amount of the crosslinking agent used is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, and further preferably 0.02 to 2 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer. Furthermore, 0.03 to 1 part by weight is preferable.
- the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer can contain a silane coupling agent and other additives.
- a silane coupling agent for example, polyether compounds of polyalkylene glycol such as polypropylene glycol, powders such as colorants and pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants Anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particles, foils and the like can be added as appropriate according to the intended use. Moreover, you may employ
- These additives are preferably used in an amount of 5 parts by weight or less, further 3 parts by weight or less, and further 1 part by weight or less based on 100 parts by weight of the (meth) acrylic polymer.
- the surface treatment layer is preferably formed so as to have a surface resistance value of 1 ⁇ 10 7 to 1 ⁇ 10 11 ⁇ / ⁇ as described above.
- Conductivity can be imparted to the surface treatment layer by containing an antistatic agent.
- the surface treatment layer can be provided on the transparent protective film used for the first polarizing film, or can be provided separately from the transparent protective film.
- a hard coat layer, an antiglare treatment layer, an antireflection layer, an antisticking layer, and the like can be provided.
- the antistatic agent used for imparting conductivity to the surface treatment layer those exemplified above can be used, but at least any one selected from ionic surfactants, conductive fine particles, and conductive polymers. It is preferable to contain one kind.
- the antistatic agent used for the surface treatment layer is preferably a conductive fine particle from the viewpoint of optical properties, appearance, antistatic effect and antistatic effect when heated and humidified.
- the surface treatment layer is preferably a hard coat layer.
- a material for forming the hard coat layer for example, a thermoplastic resin or a material that is cured by heat or radiation can be used.
- the material include radiation curable resins such as thermosetting resins, ultraviolet curable resins, and electron beam curable resins.
- an ultraviolet curable resin that can efficiently form a cured resin layer by a simple processing operation by a curing treatment by ultraviolet irradiation is preferable.
- these curable resins include polyesters, acrylics, urethanes, amides, silicones, epoxies, melamines, and the like, and these monomers, oligomers, polymers, and the like are included.
- Radiation curable resins particularly ultraviolet curable resins are particularly preferred because of their high processing speed and low thermal damage to the substrate.
- the ultraviolet curable resin preferably used include those having an ultraviolet polymerizable functional group, and among them, those containing an acrylic monomer or oligomer component having 2 or more, particularly 3 to 6 functional groups.
- a photopolymerization initiator is blended in the ultraviolet curable resin.
- an antiglare treatment layer or an antireflection layer for the purpose of improving visibility can be provided.
- An antiglare treatment layer or an antireflection layer can be provided on the hard coat layer.
- the constituent material of the antiglare layer is not particularly limited, and for example, a radiation curable resin, a thermosetting resin, a thermoplastic resin, or the like can be used.
- As the antireflection layer titanium oxide, zirconium oxide, silicon oxide, magnesium fluoride, or the like is used.
- the antireflection layer can be provided with a plurality of layers.
- examples of the surface treatment layer include a sticking prevention layer.
- the thickness of the surface treatment layer can be appropriately set depending on the type of the surface treatment layer, but is generally preferably 0.1 to 100 ⁇ m.
- the thickness of the hard coat layer is preferably 0.5 to 20 ⁇ m.
- the thickness of the hard coat layer is not particularly limited, but if it is too thin, sufficient hardness as the hard coat layer cannot be obtained, while if it is too thick, cracking and peeling are likely to occur.
- the thickness of the hard coat layer is more preferably 1 to 10 ⁇ m.
- the amount of the antistatic agent and binder (resin material etc.) used in the surface treatment layer depends on the kind of the material, but the surface resistance value of the obtained surface treatment layer is 1 ⁇ 10 7 to 1 ⁇ 10 11 ⁇ / It is preferable to control so as to be ⁇ . Usually, it is preferably 1000 parts by weight or less, more preferably 10 to 200 parts by weight, based on 100 parts by weight of the antistatic agent.
- ⁇ Surface protection film> As the surface protective film that can be provided on the surface treatment layer, a film having an adhesive layer on at least one surface of the support film can be used.
- the pressure-sensitive adhesive layer of the surface protective film can contain a light release agent, an antistatic agent, and the like.
- the surface protective film is bonded to the surface treatment layer and then peeled off, so that it does not contain the antistatic agent.
- a conductive function can be imparted to the surface of the surface treatment layer, and the surface treatment layer can contain an antistatic agent. The same antistatic agent as described above can be used.
- a light release agent In order to impart a conductive function to the surface of the surface treatment layer by peeling off the surface protective film, it is preferable to use a light release agent together with an antistatic agent in the pressure-sensitive adhesive layer of the surface protective film.
- the light release agent include polyorganosiloxane. How much conductive function is imparted to the surface of the surface treatment layer is determined by appropriately adjusting the amounts of the charged conductive agent and light release agent used.
- a surface protective film can also be provided in the below-mentioned 2nd polarizing film surface.
- the polarizing film with the pressure-sensitive adhesive layer of the present invention is provided with an easy-adhesion layer on the surface of the first polarizing film on which the anchor layer is provided, or various easy adhesions such as corona treatment and plasma treatment. Can be processed.
- the in-cell type liquid crystal cell B and the in-cell type liquid crystal panel C will be described below.
- the in-cell type liquid crystal cell B includes a liquid crystal layer 20 including liquid crystal molecules that are homogeneously aligned in the absence of an electric field, a first transparent substrate 41 that sandwiches the liquid crystal layer 20 on both sides, and a first transparent substrate 41. Two transparent substrates 42 are provided. Further, a touch sensor and a touch sensing electrode unit related to a touch drive function are provided between the first transparent substrate 41 and the second transparent substrate 42.
- the touch sensing electrode part can be formed by a touch sensor electrode 31 and a touch drive electrode 32 as shown in FIGS.
- the touch sensor electrode here refers to a touch detection (reception) electrode.
- the touch sensor electrode 31 and the touch drive electrode 32 can be independently formed in various patterns.
- the in-cell type liquid crystal cell B is a plane
- the in-cell type liquid crystal cell B can be arranged in a pattern that intersects at right angles according to a form provided independently in the X-axis direction and the Y-axis direction. 2, 3, and 6,
- the touch sensor electrode 31 is disposed on the first transparent substrate 41 side (viewing side) with respect to the touch drive electrode 32, but contrary to the above.
- the touch drive electrode 32 may be disposed closer to the first transparent substrate 41 (viewing side) than the touch sensor electrode 31.
- the touch sensing electrode unit can use an electrode 33 in which a touch sensor electrode and a touch drive electrode are integrally formed.
- the touch sensing electrode unit may be disposed between the liquid crystal layer 20 and the first transparent substrate 41 or the second transparent substrate 42.
- 2 and 4 show a case where the touch sensing electrode portion is disposed between the liquid crystal layer 20 and the first transparent substrate 41 (on the viewing side with respect to the liquid crystal layer 20).
- 3 and 5 show a case where the touch sensing electrode unit is disposed between the liquid crystal layer 20 and the second transparent substrate 42 (on the backlight side of the liquid crystal layer 20).
- the touch sensing electrode unit includes a touch sensor electrode 31 between the liquid crystal layer 20 and the first transparent substrate 41, and the liquid crystal layer 20 and the second transparent substrate 42
- a touch driving electrode 32 may be provided between the electrodes.
- the drive electrode in the touch sensing electrode unit (the electrode 33 in which the touch drive electrode 32, the touch sensor electrode, and the touch drive electrode are integrally formed) can also be used as a common electrode for controlling the liquid crystal layer 20.
- liquid crystal layer 20 used in the in-cell type liquid crystal cell B a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in the absence of an electric field is used.
- an IPS liquid crystal layer is preferably used as the liquid crystal layer 20.
- any type of liquid crystal layer such as a TN type, an STN type, a ⁇ type, and a VA type can be used.
- the thickness of the liquid crystal layer 20 is, for example, about 1.5 ⁇ m to 4 ⁇ m.
- the in-cell type liquid crystal cell B includes a touch sensor and a touch sensing electrode part related to a touch drive function in the liquid crystal cell, and does not have a touch sensor electrode outside the liquid crystal cell. That is, the conductive layer (surface resistance is 1 ⁇ 10 13 ⁇ / cm) on the viewing side of the in-cell type liquid crystal cell B from the first transparent substrate 41 (the liquid crystal cell side of the first adhesive layer 2 of the in-cell type liquid crystal panel C). ⁇ or less) is not provided.
- the in-cell type liquid crystal panel C shown in FIGS. 2 to 6 shows the order of the components, but the in-cell type liquid crystal panel C can have other configurations as appropriate.
- a color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41).
- the material for forming the transparent substrate examples include glass or polymer film.
- the polymer film examples include polyethylene terephthalate, polycycloolefin, and polycarbonate.
- the thickness is, for example, about 0.1 mm to 1 mm.
- the thickness is, for example, about 10 ⁇ m to 200 ⁇ m.
- the said transparent substrate can have an easily bonding layer and a hard-coat layer on the surface.
- the touch sensor electrode 31 (capacitance sensor), the touch drive electrode 32, or the electrode 33 in which the touch sensor electrode and the touch drive electrode are integrally formed are formed as a transparent conductive layer.
- the constituent material of the transparent conductive layer is not particularly limited. For example, gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, tungsten, and the like An alloy etc. are mentioned.
- Examples of the constituent material of the transparent conductive layer include metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium. Specifically, indium oxide, tin oxide, titanium oxide, cadmium oxide, and these And metal oxides made of a mixture of these.
- the metal oxide may further include an oxide of a metal atom shown in the above group, if necessary.
- ITO indium oxide
- tin oxide tin oxide containing antimony, or the like
- ITO is particularly preferably used.
- ITO preferably contains 80 to 99% by weight of indium oxide and 1 to 20% by weight of tin oxide.
- the electrodes related to the touch sensing electrode part are usually the first transparent substrate 41 and / or the second transparent substrate.
- a transparent electrode pattern can be formed inside the substrate 42 (on the liquid crystal layer 20 side in the in-cell type liquid crystal cell B) by a conventional method.
- the transparent electrode pattern is usually electrically connected to a lead line (not shown) formed at the end of the transparent substrate, and the lead line is connected to a controller IC (not shown).
- a shape of the transparent electrode pattern an arbitrary shape such as a stripe shape or a rhombus shape can be adopted in addition to the comb shape.
- 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.
- the in-cell type liquid crystal panel C of the present invention has a polarizing film A with an adhesive layer on the viewing side of the in-cell type liquid crystal cell B and a second polarizing film 11 on the opposite side, as shown in FIGS. be able to.
- the said polarizing film A with an adhesive layer is arrange
- the second polarizing film 11 is disposed on the second transparent substrate 42 side of the in-cell type liquid crystal cell B with the second pressure-sensitive adhesive layer 12 interposed therebetween.
- the first polarizing film 1 and the second polarizing film 11 in the polarizing film A with the pressure-sensitive adhesive layer are arranged on both sides of the liquid crystal layer 20 so that the transmission axes (or absorption axes) of the respective polarizers are orthogonal to each other.
- the second polarizing film 11 As the second polarizing film 11, those described in the first polarizing film 1 can be used.
- the 2nd polarizing film 11 may use the same thing as the 1st polarizing film 1, and may use a different thing.
- the pressure-sensitive adhesive described in the first pressure-sensitive adhesive layer 2 can be used.
- an adhesive used for formation of the 2nd adhesive layer 12 the same thing as the 1st adhesive layer 2 may be used, and a different thing may be used.
- the thickness of the second pressure-sensitive adhesive layer 12 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 still more preferably 5 to 35 ⁇ m.
- a conductive structure 51 is provided on at least one side surface selected from the surface treatment layer 4, the anchor layer 3, and the first pressure-sensitive adhesive layer 2 of the polarizing film A with the pressure-sensitive adhesive layer. Or 50 can be provided.
- FIG. 2 the case where the conduction
- FIG. 2 the case where the conduction
- electrical_connection structure 50 is provided in the side surface of the anchor layer 3 and the 1st adhesive layer 2 is illustrated.
- conductive structures 51 and 50 are provided, but the conductive structure is at least one selected from the surface treatment layer 4 containing an antistatic agent, the anchor layer 3, and the first pressure-sensitive adhesive layer 2. It can be provided on the side of the layer. For example, even when the antistatic agent is contained in the two layers, the conductive structure 50 may be provided if conductivity is imparted to the two layers of the anchor layer 3 and the first pressure-sensitive adhesive layer 2. For example, the conductive structure 51 may not be provided.
- the conductive structures 51 and 50 may be provided on all or at least one of the side surfaces of the surface treatment layer 4, the anchor layer 3, and the first pressure-sensitive adhesive layer 2. Good.
- the conductive structure is provided in part, the conductive structure is provided at a ratio of 1 area% or more, preferably 3 area% or more of the area of the side surface in order to ensure conduction on the side surface. preferable.
- the conductive structures 51 and 50 By connecting the electric potential from the side surface of at least one layer selected from the surface treatment layer 4, the anchor layer 3, and the first pressure-sensitive adhesive layer 2 to the other suitable locations by the conductive structures 51 and 50, Occurrence can be suppressed.
- the material for forming the conductive structures 51 and 50 include conductive pastes such as silver, gold, and other metal pastes.
- a conductive adhesive and any other suitable conductive material can be used.
- the conductive structures 51 and 50 can also be formed in a linear shape extending from the side surface of at least one of the surface treatment layer 4, the anchor layer 3, and the first pressure-sensitive adhesive layer 2.
- positioned at the opposite side to the visual recognition side of the liquid crystal layer 20 are other according to the suitability of each arrangement
- An optical film can be laminated and used.
- the other optical films include liquid crystal display devices such as a reflection plate, an anti-transmission plate, a retardation film (including wavelength plates such as 1/2 and 1/4), a visual compensation film, and a brightness enhancement film.
- the liquid crystal display device with a built-in touch sensing function using the in-cell type liquid crystal panel C of the present invention can appropriately use a member for forming a liquid crystal display device such as a lighting system using a backlight or a reflector.
- ⁇ Creation of polarizing film> A polyvinyl alcohol film having a thickness of 80 ⁇ m was stretched up to 3 times while being dyed for 1 minute in an iodine solution of 0.3% concentration at 30 ° C. between rolls having different speed ratios. Thereafter, the total draw ratio was stretched to 6 times while being immersed in an aqueous solution containing 60% at 4% concentration of boric acid and 10% concentration of potassium iodide for 0.5 minutes. Next, after washing by immersing in an aqueous solution containing potassium iodide at 30 ° C. and 1.5% concentration for 10 seconds, drying was performed at 50 ° C. for 4 minutes to obtain a polarizer having a thickness of 30 ⁇ m. A saponified 80 ⁇ m thick triacetyl cellulose film was bonded to both surfaces of the polarizer with a polyvinyl alcohol-based adhesive to prepare a polarizing film.
- ⁇ Formation of surface treatment layer> a dispersion of an ultraviolet curable resin containing ATO (antimony-doped tin oxide) particles as a material for forming an antistatic hard coat layer on one side of the polarizing film obtained above (Sumitomo) ASHC-101, made by Osaka Cement, was adjusted so that the thickness after drying was as shown in Table 1 and applied with a wire bar, and then dried by heating at 80 ° C. for 1 minute to form a coating film. Subsequently, the coating film was irradiated with 300 mJ / cm 2 ultraviolet rays with a metal halide lamp to cure the coating film, thereby forming an antistatic hard coat layer (indicated as ASHC in Table 1).
- ATO antimony-doped tin oxide
- the coating solution for the hard coat layer that does not contain the antistatic agent is 100 parts of an ultraviolet curable acrylic resin (Dainippon Ink Chemical Co., Ltd., Unidic 17-806), a photopolymerization initiator (Ciba Specialty). It was prepared by mixing 3 parts of Chemicals, Irgacure 184) and 100 parts of toluene. Using the prepared solution, the thickness after drying was adjusted to the thickness shown in Table 1 and applied with a wire bar, and then heated and dried at 80 ° C. for 1 minute to form a coating film. Next, the coating film was irradiated with 300 mJ / cm 2 ultraviolet rays with a metal halide lamp to cure the coating film to form a hard coat layer (indicated as HC in Table 1).
- Example 9 (Preparation of anchor layer forming material)
- a solution containing 10 to 50% by weight of a thiophene-based polymer (trade name: Denatron P-580W, manufactured by Nagase ChemteX Corp.) 8.6 parts in solid content
- a solution containing an oxazoline group-containing acrylic polymer (Product name: Epocross WS-700, manufactured by Nippon Shokubai Co., Ltd.) 1 part and 90.4 parts of water were mixed to prepare an anchor layer forming coating solution having a solid content concentration of 0.5% by weight.
- the obtained coating solution for forming an anchor layer contained 0.04% by weight of a polythiophene polymer and 0.25% by weight of an oxazoline group-containing acrylic polymer.
- the anchor layer-forming coating solution is applied to one side of the polarizing film (the side where the hard coat layer is not provided) so that the thickness after drying is as shown in Table 1, and dried at 80 ° C. for 2 minutes. Thus, an anchor layer was formed.
- the obtained anchor layer contained 8 wt% and 50 wt% of the thiophene polymer and the oxazoline group-containing acrylic polymer, respectively.
- the ionic compound shown in Table 1 is blended in the usage amount shown in Table 1 with respect to 100 parts of the solid content of the acrylic polymer solution obtained above, and an isocyanate crosslinking agent (Takenate D160N manufactured by Mitsui Chemicals, Inc.). , Trimethylolpropane hexamethylene diisocyanate) 0.1 part, benzoyl peroxide (Niper BMT manufactured by NOF Corporation) and ⁇ -glycidoxypropylmethoxysilane (Shin-Etsu Chemical Co., Ltd .: KBM-403) 0 .2 parts were blended to prepare an acrylic pressure-sensitive adhesive composition solution.
- an isocyanate crosslinking agent Takenate D160N manufactured by Mitsui Chemicals, Inc.
- Trimethylolpropane hexamethylene diisocyanate Trimethylolpropane hexamethylene diisocyanate
- benzoyl peroxide Niper BMT manufactured by NOF Corporation
- Examples 1 to 14 and Comparative Examples 1 and 2 An anchor layer and a pressure-sensitive adhesive layer were sequentially formed on one side of the polarizing film obtained above (side where no hard coat layer was provided) by the combinations shown in Table 1 to produce a polarizing film with a pressure-sensitive adhesive layer. .
- Example 13 the following surface protective film was bonded to the hard coat layer side of the obtained polarizing film with an adhesive layer, and then peeled to provide an antistatic layer.
- a (meth) acrylic polymer (A) and a pressure-sensitive adhesive solution shown below were prepared, and a surface protective film was prepared by the following method using the pressure-sensitive adhesive solution.
- the polymerization reaction was carried out for 6 hours, and a (meth) acrylic polymer (A) solution (40% by weight) was prepared.
- the acrylic polymer (A) had a weight average molecular weight of 540,000 and a glass transition temperature (Tg) of ⁇ 67 ° C.
- the (meth) acrylic polymer (A) solution (40%) is diluted to 20% with ethyl acetate, and an organopolysiloxane having an oxyalkylene chain as a silicone component is added to 500 parts (100 parts solids) of this solution.
- KF-353 (manufactured by Shin-Etsu Chemical Co., Ltd.) diluted to 10% with ethyl acetate 2 parts (solid content 0.2 parts), as an alkali metal salt (ionic compound) as an antistatic agent, lithium bis (trifluoro) Lomomethanesulfonyl) imide (LiN (CF 3 SO 2 ) 2 : LiTFSI, manufactured by Tokyo Chemical Industry Co., Ltd.) diluted to 1% with ethyl acetate 15 parts (solid content 0.15 part), trifunctional isocyanate as a crosslinking agent 1.75 parts by weight (solid content 1) of isocyanurate of hexamethylene diisocyanate (Nippon Polyurethane Industry Co., Coronate HX) .75 parts by weight) 0.3 part (solid content 0.3 part) of 1,3-bis (isocyanatomethyl) cyclohexane (Mitsui Chemicals, Takenate 600), which is a bifunctional iso
- An antistatic agent solution was prepared by diluting 10 parts of an antistatic agent (manufactured by Solvex, Microsolver RMd-142, mainly composed of tin oxide and polyester resin) with a mixed solvent of 30 parts of water and 70 parts of methanol. Prepared.
- the obtained antistatic agent solution was applied onto a polyethylene terephthalate (PET) film (thickness: 38 ⁇ m) using a Meyer bar and dried at 130 ° C. for 1 minute to remove the solvent and remove the antistatic layer (thickness). Thickness: 0.2 ⁇ m) to form an antistatic film.
- PET polyethylene terephthalate
- ⁇ Surface resistance ( ⁇ / ⁇ ): conductivity> The surface resistance value was measured for the surface treatment layer, the anchor layer, and the pressure-sensitive adhesive layer.
- the surface resistance value of the surface treatment layer was measured for the surface treatment layer of the polarizing film with the pressure-sensitive adhesive layer.
- the surface resistance value of the surface treatment layer was measured in Examples 13 and 14 after the surface protective film was bonded to the polarizing film with the pressure-sensitive adhesive layer and then peeled off.
- the surface resistance value of the anchor layer was measured on the anchor layer side surface of the polarizing film with the anchor layer before forming the pressure-sensitive adhesive layer. When the anchor layer was not formed, the surface resistance value of the surface of the polarizing film was measured.
- the surface resistance value of the pressure-sensitive adhesive layer was measured on the surface of the pressure-sensitive adhesive layer formed on the separator film.
- Example 1 the conductive structure was not formed with silver paste. (Evaluation criteria) ⁇ : Within 1 second. A: Within 3 seconds. ⁇ : Over 3 seconds to within 5 seconds. ⁇ : Over 5 seconds and within 20 seconds. X: Over 20 seconds.
- ⁇ TSP sensitivity> A lead wiring (not shown) around the transparent electrode pattern in the in-cell type liquid crystal cell was connected to a controller IC (not shown) to produce a liquid crystal display device with a built-in touch sensing function. Visual observation was performed while using the input display device of the touch-sensing function built-in liquid crystal display device, and the presence or absence of malfunction was confirmed. ⁇ : No malfunction. X: There is a malfunction.
- Li-TFSI is bis (trifluoromethanesulfonyl) imide lithium
- MPP-TFSI is bis (trifluoromethanesulfonyl) imide methylpropylpyrrolidinium
- EMI-FSI is bis (fluorosulfonyl) imide 1-ethyl-3-methylimidazolium
- EMP-TFSI indicates bis (trifluoromethanesulfonyl) imido ethylmethylpyrrolidinium.
Abstract
Description
前記インセル型液晶セルの視認側の第1透明基板の側に、導電層を介することなく第1粘着剤層を介して配置された粘着剤層付偏光フィルムを有するインセル型液晶パネルであって、
前記粘着剤層付偏光フィルムが、表面処理層、第1偏光フィルム、第1粘着剤層をこの順で有するか、または、表面処理層、第1偏光フィルム、アンカー層、第1粘着剤層をこの順で有し、
前記表面処理層、アンカー層、第1粘着剤層から選ばれるいずれか少なくとも1層は帯電防止剤を含有することを特徴とするインセル型液晶パネル、に関する。
前記表面処理層は、表面抵抗値が1×107~1×1011Ω/□であること、
前記アンカー層は、表面抵抗値が1×108~1×1011Ω/□であること、
前記第1粘着剤層は、表面抵抗値が1×108~1×1011Ω/□であること、
を満足することが好ましい。
第1偏光フィルムは、偏光子の片面または両面に透明保護フィルムを有するものが一般に用いられる。偏光子は、特に限定されず、各種のものを使用できる。偏光子としては、例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料の二色性物質を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。これらの中でも、ポリビニルアルコール系フィルムとヨウ素等の二色性物質からなる偏光子が好適である。これらの偏光子の厚さは特に制限されないが、一般的に80μm程度以下である。
前記のように、表面処理層、アンカー層および第1粘着剤層の少なくとも1層には、導電性を付与するために帯電防止剤が用いられる。帯電防止剤としては、例えば、イオン性界面活性剤系、導電性ポリマー、導電性微粒子等の帯電防止性を付与できる材料が挙げられる。また帯電防止剤としては、イオン性化合物を用いることができる。
また、イオン性化合物としては、アルカリ金属塩及び/または有機カチオン-アニオン塩を好ましく用いることができる。アルカリ金属塩は、アルカリ金属の有機塩および無機塩を用いることができる。なお、本発明でいう、「有機カチオン-アニオン塩」とは、有機塩であって、そのカチオン部が有機物で構成されているものを示し、アニオン部は有機物であっても良いし、無機物であっても良い。「有機カチオン-アニオン塩」は、イオン性液体、イオン性固体とも言われる。
アルカリ金属塩のカチオン部を構成するアルカリ金属イオンとしては、リチウム、ナトリウム、カリウムの各イオンが挙げられる。これらアルカリ金属イオンのなかでもリチウムイオンが好ましい。
(1):(CnF2n+1SO2)2N- (但し、nは1~10の整数)、
(2):CF2(CmF2mSO2)2N- (但し、mは1~10の整数)、
(3):-O3S(CF2)lSO3 - (但し、lは1~10の整数)、
(4):(CpF2p+1SO2)N-(CqF2q+1SO2)、(但し、p、qは1~10の整数)、で表わされるもの等が用いられる。特に、フッ素原子を含むアニオン部は、イオン解離性の良いイオン化合物が得られることから好ましく用いられる。無機塩を構成するアニオン部としては、Cl-、Br-、I-、AlCl4 -、Al2Cl7 -、BF4 -、PF6 -、ClO4 -、NO3 -、AsF6 -、SbF6 -、NbF6 -、TaF6 -、(CN)2N-、等が用いられる。アニオン部としては、(CF3SO2)2N-、(C2F5SO2)2N-、等の前記一般式(1)で表わされる、(ペルフルオロアルキルスルホニル)イミドが好ましく、特に(CF3SO2)2N-、で表わされる(トリフルオロメタンスルホニル)イミドが好ましい。
本発明で用いられる有機カチオン-アニオン塩は、カチオン成分とアニオン成分とから構成されており、前記カチオン成分は有機物からなるものである。カチオン成分として、具体的には、ピリジニウムカチオン、ピペリジニウムカチオン、ピロリジニウムカチオン、ピロリン骨格を有するカチオン、ピロール骨格を有するカチオン、イミダゾリウムカチオン、テトラヒドロピリミジニウムカチオン、ジヒドロピリミジニウムカチオン、ピラゾリウムカチオン、ピラゾリニウムカチオン、テトラアルキルアンモニウムカチオン、トリアルキルスルホニウムカチオン、テトラアルキルホスホニウムカチオン等が挙げられる。
(1):(CnF2n+1SO2)2N- (但し、nは1~10の整数)、
(2):CF2(CmF2mSO2)2N- (但し、mは1~10の整数)、
(3):-O3S(CF2)lSO3 - (但し、lは1~10の整数)、
(4):(CpF2p+1SO2)N-(CqF2q+1SO2)、(但し、p、qは1~10の整数)、で表わされるもの等が用いられる。なかでも特に、フッ素原子を含むアニオン成分は、イオン解離性の良いイオン化合物が得られることから好ましく用いられる。
アンカー層に導電性を付与する場合は、アンカー層は、前記のように、厚さが0.01~0.5μmであり、表面抵抗値が1×108~1×1012Ω/□になるように形成されているのが好ましい。導電性のアンカー層は、各種の帯電防止剤組成物から形成することができる。アンカー層を形成する帯電防止剤としては、前記例示のなかでも、イオン性界面活性剤系、導電性ポリマー、導電性微粒子等が好ましい。
第1粘着剤層に導電性を付与する場合は、第1粘着剤層は、前記のように、厚さが5~100μm、表面抵抗値が1×108~1×1012Ω/□になるように形成するのが好ましい。導電性の第1粘着剤層は、各種の粘着剤に帯電防止剤を配合した組成物から形成することができる。
表面処理層に導電性を付与する場合は、表面処理層は、前記のように、表面抵抗値が1×107~1×1011Ω/□になるように形成するのが好ましい。前記表面処理層には、帯電防止剤を含有させることにより導電性を付与することができる。表面処理層は、第1偏光フィルムに用いられる透明保護フィルムに設けることができるほか、別途、透明保護フィルムとは別体のものとして設けることもできる。前記表面処理層としては、ハードコート層、防眩処理層、反射防止層、スティッキング防止層などを設けることができる。前記表面処理層に導電性を付与するために用いられる帯電防止剤としては、前記例示のものを用いることができるが、イオン性界面活性剤、導電性微粒子及び導電性ポリマーから選ばれるいずれか少なくとも1種類を含有するのが好ましい。表面処理層に用いる帯電防止剤としては、光学特性、外観、帯電防止効果および帯電防止効果の熱時、加湿時での安定性の点から導電性微粒子であるのが好ましい。
前記表面処理層に設けることができる表面保護フィルムは、支持フィルムの少なくとも片面に粘着剤層を有するものを用いることができる。前記表面保護フィルムの粘着剤層には、軽剥離剤、帯電防止剤等を含有することができる。前記表面保護フィルムの粘着剤層が帯電防止剤を含有する場合には、当該表面保護フィルムを、前記表面処理層に貼り合わせて、その後に、剥離することで、帯電防止剤を含有していない表面処理層表面に対しても導電機能を付与することができ、表面処理層に帯電防止剤を含有させることができる。帯電防止剤は前記同様のものを用いることができる。また、前記表面保護フィルムの剥離により、表面処理層表面に導電機能を付与するためには、前記表面保護フィルムの粘着剤層に、帯電防止剤とともに、軽剥離剤を用いることが好ましい。軽剥離剤としては、例えば、ポリオルガノシロキサン等を例示できる。前記表面処理層表面にどの程度の導電機能を付与させるかは、帯電導電剤と軽剥離剤の使用量を適宜に調整して決定される。なお、表面保護フィルムは、後述の第2偏光フィルム表面に設けることもできる。
本発明の粘着剤層付偏光フィルムには、前記の各層の他に、第1偏光フィルムのアンカー層を設ける側の表面に、易接着層を設けたり、コロナ処理、プラズマ処理等の各種易接着処理を施したりすることができる。
図2乃至図6に示すように、インセル型液晶セルBは、電界が存在しない状態でホモジニアス配向した液晶分子を含む液晶層20、前記液晶層20を両面で挟持する第1透明基板41および第2透明基板42を有する。また前記第1透明基板41と第2透明基板42との間にタッチセンサーおよびタッチ駆動の機能に係るタッチセンシング電極部を有する。
本発明のインセル型液晶パネルCは、図2乃至6に示すように、インセル型液晶セルBの視認側に粘着剤層付偏光フィルムAを有し、その反対側に第2偏光フィルム11を有することができる。前記粘着剤層付偏光フィルムAは前記インセル型液晶セルBの第1透明基板41の側に、導電層を介することなく前記第1粘着剤層2を介して配置されている。一方、前記インセル型液晶セルBの第2透明基板42の側には、第2偏光フィルム11が第2粘着剤層12を介して配置されている。前記粘着剤層付偏光フィルムAにおける第1偏光フィルム1、第2偏光フィルム11は、液晶層20の両側で、それぞれの偏光子の透過軸(または吸収軸)が直交するように配置される。
本発明のインセル型液晶パネルCを用いたタッチセンシング機能内蔵液晶表示装置は、照明システムにバックライトあるいは反射板を用いたもの等の液晶表示装置を形成する部材を適宜に用いることができる。
(メタ)アクリル系ポリマーの重量平均分子量(Mw)は、GPC(ゲル・パーミエーション・クロマトグラフィー)により測定した。Mw/Mnについても、同様に測定した。
・分析装置:東ソー社製、HLC-8120GPC
・カラム:東ソー社製、G7000HXL+GMHXL+GMHXL
・カラムサイズ:各7.8mmφ×30cm 計90cm
・カラム温度:40℃
・流量:0.8mL/min
・注入量:100μL
・溶離液:テトラヒドロフラン
・検出器:示差屈折計(RI)
・標準試料:ポリスチレン
厚さ80μmのポリビニルアルコールフィルムを、速度比の異なるロール間において、30℃、0.3%濃度のヨウ素溶液中で1分間染色しながら、3倍まで延伸した。その後、60℃、4%濃度のホウ酸、10%濃度のヨウ化カリウムを含む水溶液中に0.5分間浸漬しながら総合延伸倍率が6倍まで延伸した。次いで、30℃、1.5%濃度のヨウ化カリウムを含む水溶液中に10秒間浸漬することで洗浄した後、50℃で4分間乾燥を行い、厚さ30μmの偏光子を得た。当該偏光子の両面に、けん化処理した厚さ80μmのトリアセチルセルロースフィルムをポリビニルアルコール系接着剤により貼り合せて偏光フィルムを作成した。
実施例1、2、10では、上記で得られた偏光フィルムの片面に、帯電防止性ハードコート層の形成材として、ATO(アンチモンドープ酸化スズ)粒子含有の紫外線硬化型樹脂の分散液(住友大阪セメント製、ASHC-101)を、乾燥後の厚みが表1に示す厚みになるように調整してワイヤーバーにて塗布した後、80℃で1分間加熱乾燥して塗膜を形成した。次いで、塗膜にメタルハライドランプで300mJ/cm2の紫外線を照射して、塗膜を硬化し、帯電防止のハードコート層(表1中、ASHCとして標記)を形成した。
実施例9では、固形分で、チオフェン系ポリマーを10~50重量%含む溶液(商品名:デナトロンP-580W、ナガセケムテックス(株)製)8.6部、オキサゾリン基含有アクリルポリマーを含む溶液(商品名:エポクロスWS-700、(株)日本触媒製)1部、及び、水90.4部を混合し、固形分濃度が0.5重量%のアンカー層形成用塗布液を調製した。得られたアンカー層形成用塗布液は、ポリチオフェン系ポリマーを0.04重量%、オキサゾリン基含有アクリルポリマーを0.25重量%含有していた。
当該アンカー層形成用塗布液を上記偏光フィルムの片面(ハードコート層を設けていない側)に、乾燥後の厚みが表1に示す厚さになるように塗布し、80℃で2分間乾燥してアンカー層を形成した。得られたアンカー層には、チオフェン系ポリマー、オキサゾリン基含有アクリルポリマーが、それぞれ、8重量%、50重量%含まれていた。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた4つ口フラスコに、ブチルアクリレート74.8部、フェノキシエチルアクリレート23部、N-ビニル-2-ピロリドン(NVP)0.5部、アクリル酸0.3部、4-ヒドロキシブチルアクリレート0.4部を含有するモノマー混合物を仕込んだ。さらに、前記モノマー混合物(固形分)100部に対して、重合開始剤として2,2’-アゾビスイソブチロニトリル0.1部を酢酸エチル100部と共に仕込み、緩やかに攪拌しながら窒素ガスを導入して窒素置換した後、フラスコ内の液温を55℃付近に保って8時間重合反応を行って、重量平均分子量(Mw)160万、Mw/Mn=3.7のアクリル系ポリマーの溶液を調製した。
上記で得られたアクリル系ポリマーの溶液の固形分100部に対して、表1に示す使用量で、表1に示すイオン性化合物を配合し、さらにイソシアネート架橋剤(三井化学社製のタケネートD160N,トリメチロールプロパンヘキサメチレンジイソシアネート)0.1部、ベンゾイルパーオキサイド(日本油脂社製のナイパーBMT)0.3部およびγ-グリシドキシプロピルメトキシシラン(信越化学工業社製:KBM-403)0.2部を配合して、アクリル系粘着剤組成物の溶液を調製した。
次いで、上記アクリル系粘着剤組成物の溶液を、シリコーン系剥離剤で処理されたポリエチレンテレフタレートフィルム(セパレータフィルム:三菱化学ポリエステルフィルム(株)製,MRF38)の片面に、乾燥後の粘着剤層の厚さが表1に示す厚さになるように塗布し、155℃で1分間乾燥を行い、セパレータフィルムの表面に粘着剤層を形成した。当該粘着剤層は、アンカー層を形成された偏光フィルムまたはアンカー層の形成されていない偏光フィルムに転写した。
上記で得られた偏光フィルムの片面(ハードコート層を設けていない側)に、表1に示す組み合わせにより、アンカー層と粘着剤層を順次に形成して、粘着剤層付偏光フィルムを作製した。
下記に示す(メタ)アクリル系ポリマー(A)、粘着剤溶液を調製して、当該粘着剤溶液を用いて、下記方法で表面保護フィルムを作製した。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた四つ口フラスコに2-エチルヘキシルアクリレート(2EHA)100部、4-ヒドロキシブチルアクリレート(4HBA)10部、アクリル酸(AA)0.02部、重合開始剤として2,2´-アゾビスイソブチロニトリル0.2部、酢酸エチル157部を仕込み、緩やかに攪拌しながら窒素ガスを導入し、フラスコ内の液温を65℃付近に保って6時間重合反応を行い、(メタ)アクリル系ポリマー(A)溶液(40重量%)を調製した。前記アクリル系ポリマー(A)の重量平均分子量は54万、ガラス転移温度(Tg)は、-67℃であった。
上記(メタ)アクリル系ポリマー(A)溶液(40%)を酢酸エチルで20%に希釈し、この溶液500部(固形分100部)に、シリコーン成分であるオキシアルキレン鎖を有するオルガノポリシロキサン(KF-353,信越化学工業社製)を酢酸エチルで10%に希釈した溶液2部(固形分0.2部)、帯電防止剤であるアルカリ金属塩(イオン性化合物)として、リチウムビス(トリフルオロメタンスルホニル)イミド(LiN(CF3SO2)2:LiTFSI,東京化成工業社製)を酢酸エチルで1%に希釈した溶液15部(固形分0.15部)、架橋剤として、3官能イソシアネート化合物であるヘキサメチレンジイソシアネートのイソシアヌレート体(日本ポリウレタン工業社製,コロネートHX)1.75重量部(固形分1.75重量部)、2官能イソシアネート化合物である1,3-ビス(イソシアナートメチル)シクロヘキサン(三井化学社製,タケネート600)0.3部(固形分0.3部)、架橋触媒としてジラウリン酸ジブチルスズ(1%酢酸エチル溶液)2部(固形分0.02部)を加えて、混合攪拌を行い、アクリル系粘着剤溶液を調製した。
帯電防止剤(ソルベックス社製,マイクロソルバーRMd-142,酸化スズとポリエステル樹脂を主成分とする)10部を、水30部とメタノール70部からなる混合溶媒で希釈することにより帯電防止剤溶液を調製した。
上記アクリル系粘着剤溶液を、上記の帯電防止処理フィルムの帯電防止処理面とは反対の面に塗布し、130℃で2分間加熱して、厚さ15μmの粘着剤層を形成した。次いで、上記粘着剤層の表面に、片面にシリコーン処理を施したポリエチレンテレフタレートフィルム(厚さ25μm)のシリコーン処理面を貼り合わせ、表面保護フィルムを作製した。
表面処理層、アンカー層、粘着剤層について、表面抵抗値を測定した。
表面処理層の表面抵抗値は、粘着剤層付偏光フィルムの表面処理層について測定した。表面処理層の表面抵抗値は、実施例13、14については、粘着剤層付偏光フィルムに表面保護フィルムを貼り合せた後に、剥離した後に測定した。
アンカー層の表面抵抗値は、粘着剤層を形成する前のアンカー層付の偏光フィルムのアンカー層側表面について測定した。アンカー層を形成しない場合は偏光フィルムの表面の表面抵抗値を測定した。
粘着剤層の表面抵抗値は、セパレータフィルム上に形成した粘着剤層表面について測定した。
粘着剤層付偏光フィルムからセパレータフィルムを剥がした後、図2または図3に示すように、インセル型液晶セルの視認側に貼り合わせた。次に、貼り合せた偏光フィルムの側面部に5mm幅の銀ペーストをハードコート層、偏光フィルム、アンカー層、粘着剤層の各側面部を覆うように塗布し、外部からのアース電極と接続した。当該液晶表示パネルをバックライト装置上にセットし、視認側の偏光フィルム面に静電気放電銃(Electrostatic discharge Gun)を印加電圧10kVにて発射して、電気により白抜けした部分が消失するまでの時間を測定し、下記の基準で判断した。但し、実施例1では、銀ペーストによる導通構造の形成は行わなかった。
(評価基準)
◎◎:1秒以内。
◎:3秒以内。
〇:3秒を超え~5秒以内。
△:5秒を超え、20秒以内。
×:20秒を超える。
インセル型液晶セル内部の透明電極パターン周辺部の引き回し配線(不図示)をコントローラIC(不図示)と接続し、タッチセンシング機能内蔵液晶表示装置を作製した。当該タッチセンシング機能内蔵液晶表示装置の入力表示装置を使用している状態で目視観察を行い、誤作動の有無を確認した。
〇:誤作動なし。
×:誤作動あり。
偏光フィルム側面部に銀ペーストを塗布した前記インセル型液晶セルを60℃/90%RHの雰囲気下で500時間処理を施した後、上記ESD試験を実施した。
B インセル型液晶セル
C インセル型液晶パネル
1、11 第1、第2偏光フィルム
2、12 第1、第2粘着剤層
3 アンカー層
4 表面処理層
20 液晶層
31 タッチセンサー電極
32 タッチ駆動電極
33 タッチ駆動電極兼センサー電極
41、42 第1、第2透明基板
Claims (13)
- 電界が存在しない状態でホモジニアス配向した液晶分子を含む液晶層、前記液晶層を両面で挟持する第1透明基板および第2透明基板、並びに、前記第1透明基板と第2透明基板との間にタッチセンサーおよびタッチ駆動の機能に係るタッチセンシング電極部を有するインセル型液晶セルと、
前記インセル型液晶セルの視認側の第1透明基板の側に、導電層を介することなく第1粘着剤層を介して配置された粘着剤層付偏光フィルムを有するインセル型液晶パネルであって、
前記粘着剤層付偏光フィルムが、表面処理層、第1偏光フィルム、第1粘着剤層をこの順で有するか、または、表面処理層、第1偏光フィルム、アンカー層、第1粘着剤層をこの順で有し、
前記表面処理層、アンカー層、第1粘着剤層から選ばれるいずれか少なくとも1層は帯電防止剤を含有することを特徴とするインセル型液晶パネル。 - 前記粘着剤層付偏光フィルムの前記表面処理層、アンカー層、第1粘着剤層のうち、帯電防止剤を含有する層の側面に導通構造を有することを特徴とする請求項1記載のインセル型液晶パネル。
- 前記表面処理層、アンカー層および第1粘着剤層から選ばれるいずれか少なくとも1層は、下記の表面抵抗値、
前記表面処理層は、表面抵抗値が1×107~1×1011Ω/□であること、
前記アンカー層は、表面抵抗値が1×108~1×1011Ω/□であること、
前記第1粘着剤層は、表面抵抗値が1×108~1×1011Ω/□であること、
を満足することを特徴とする請求項1または2記載のインセル型液晶パネル。 - 前記第1粘着剤層が帯電防止剤を含有することを特徴とする請求項1~3のいずれかに記載のインセル型液晶パネル。
- 前記帯電防止剤が、アルカリ金属塩及び/または有機カチオン-アニオン塩であることを特徴とする請求項4記載のインセル型液晶パネル。
- 前記表面処理層、アンカー層、第1粘着剤層から選ばれるいずれか2層以上は帯電防止剤を含有することを特徴とする請求項1~5のいずれかに記載のインセル型液晶パネル。
- 前記タッチセンシング電極部が、前記液晶層と前記第1透明基板または第2透明基板の間に配置されていることを特徴とする請求項1~6のいずれかに記載のインセル型液晶パネル。
- 前記タッチセンシング電極部が、前記液晶層と前記第1透明基板の間に配置されていることを特徴とする請求項7記載のインセル型液晶パネル。
- 前記タッチセンシング電極部が、前記液晶層と前記第2透明基板の間に配置されていることを特徴とする請求項7記載のインセル型液晶パネル。
- 前記タッチセンシング電極部が、タッチセンサー電極およびタッチ駆動電極により形成されていることを特徴とする請求項1~9のいずれかに記載のインセル型液晶パネル。
- 前記インセル型液晶セルのタッチセンシング電極部が、タッチセンサー電極およびタッチ駆動電極を一体化形成した電極であることを特徴とする請求項7~10のいずれかに記載のインセル型液晶パネル。
- 前記インセル型液晶セルの第2透明基板の側に、第2粘着剤層を介して配置された第2偏光フィルムを有することを特徴とする請求項1~11のいずれかに記載のインセル型液晶パネル。
- 請求項12記載のインセル型液晶パネルを有する液晶表示装置。
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JP7018486B2 (ja) | 2022-02-10 |
TWI753294B (zh) | 2022-01-21 |
KR102269355B1 (ko) | 2021-06-25 |
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