WO2023085083A1 - Corps multicouche optique, écran d'affichage d'image et dispositif d'affichage d'image - Google Patents

Corps multicouche optique, écran d'affichage d'image et dispositif d'affichage d'image Download PDF

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Publication number
WO2023085083A1
WO2023085083A1 PCT/JP2022/039783 JP2022039783W WO2023085083A1 WO 2023085083 A1 WO2023085083 A1 WO 2023085083A1 JP 2022039783 W JP2022039783 W JP 2022039783W WO 2023085083 A1 WO2023085083 A1 WO 2023085083A1
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polymer
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image display
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PCT/JP2022/039783
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English (en)
Japanese (ja)
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智之 木村
寛大 小野
雅人 藤田
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日東電工株式会社
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Priority to CN202280071790.5A priority Critical patent/CN118159884A/zh
Publication of WO2023085083A1 publication Critical patent/WO2023085083A1/fr

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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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • 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
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to an optical laminate, an image display panel and an image display device.
  • image display devices typified by liquid crystal display devices and electroluminescence (EL) display devices (eg, organic EL display devices and inorganic EL display devices) have rapidly spread.
  • EL electroluminescence
  • These various image display devices have a laminated structure of, for example, an image display cell such as a liquid crystal cell or an EL light-emitting device, and an optical laminate including a polarizing plate and an adhesive sheet.
  • the pressure-sensitive adhesive sheet is mainly used for bonding between films included in the optical layered body and bonding between the image display cell and the optical layered body.
  • Patent Literature 1 discloses adding a conductive agent (antistatic agent) to an adhesive sheet in order to prevent electrification of an image display device.
  • the pressure-sensitive adhesive sheet has a surface resistance value adjusted within a range of 1.34 ⁇ 10 10 ⁇ / ⁇ to 4.49 ⁇ 10 10 ⁇ / ⁇ .
  • the present invention includes an adhesive sheet having a sufficiently low surface resistance value, and is suitable for suppressing the occurrence of unnecessary coloring in light from an image display device even when subjected to a high temperature environment.
  • An object of the present invention is to provide an optical laminate.
  • the present invention A pressure-sensitive adhesive sheet formed from a pressure-sensitive adhesive composition containing a polymer (A) and a polarizing plate,
  • the polymer (A) has a dielectric constant of 5.0 or more at a frequency of 100 kHz
  • the pressure-sensitive adhesive sheet has a surface resistance value of 1.0 ⁇ 10 10 ⁇ / ⁇ or less
  • an optical laminate having a haze of 1.0% or less as measured by the following test method. Test method: An evaluation sample is prepared by sandwiching the optical layered body between two pieces of alkali-free glass. After heating the evaluation sample at 105° C. for 250 hours, the haze of the evaluation sample is measured.
  • an image display panel comprising the above optical layered body.
  • an image display device comprising the above image display panel.
  • an optical laminate can be provided.
  • FIG. 1 is a cross-sectional view schematically showing an example of the optical layered body of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an evaluation sample including an optical layered body.
  • FIG. 3 is a diagram for explaining an evaluation method using evaluation samples.
  • FIG. 4 is a cross-sectional view schematically showing an example of the optical layered body of the present invention.
  • FIG. 5 is a cross-sectional view schematically showing an example of the optical layered body of the present invention.
  • FIG. 6 is a cross-sectional view schematically showing an example of the optical layered body of the present invention.
  • FIG. 7 is a cross-sectional view schematically showing an example of the image display panel of the invention.
  • FIG. 8 is a cross-sectional view schematically showing an example of the image display panel of the invention.
  • FIG. 9 is a cross-sectional view schematically showing an example of the image display panel of the invention.
  • FIG. 1 An example of the optical laminate of this embodiment is shown in FIG.
  • the optical layered body 10A of FIG. 1 includes an adhesive sheet 1 and a polarizing plate 2. As shown in FIG. The adhesive sheet 1 and the polarizing plate 2 are laminated together.
  • the optical layered body 10A can be attached to an object (for example, an image display panel) with the adhesive sheet 1 interposed therebetween.
  • 10 A of optical laminated bodies can be used as a polarizing plate with an adhesive sheet.
  • the haze H measured by Test Method 1 below is 1.0% or less.
  • Test method 1 An optical layered body 10A is sandwiched between two alkali-free glasses to prepare an evaluation sample. After heating the evaluation sample at 105° C. for 250 hours, the haze H of the evaluation sample is measured.
  • the optical laminate 10A is attached to the non-alkali glass 20A with the adhesive sheet 1 interposed therebetween.
  • the size of the optical layered body 10A to be used is, for example, 50 mm long ⁇ 50 mm wide.
  • a transparent adhesive sheet made of an optical clear adhesive (OCA). 21 is formed on the surface of the optical layered body 10A opposite to the adhesive sheet 1, typically on the surface of the polarizing plate 2, a transparent adhesive sheet made of an optical clear adhesive (OCA). 21 is formed.
  • OCA optical clear adhesive
  • a specific example of the adhesive sheet 21 is LUCIACS CS98210U manufactured by Nitto Denko Corporation.
  • the optical layered body 10A is attached to the non-alkali glass 20B with the transparent adhesive sheet 21 interposed therebetween.
  • an evaluation sample 15 in which the optical layered body 10A is sandwiched between two alkali-free glasses 20 is obtained.
  • the alkali-free glass 20 is glass that does not substantially contain an alkali component (alkali metal oxide). be.
  • the non-alkali glass 20 is plate-shaped, for example, and has a thickness of 0.5 mm or more. As the alkali-free glass 20, one that can ignore the influence on the haze H value in test method 1 is used.
  • the evaluation sample 15 is allowed to cool to room temperature (for example, 23°C).
  • the haze H of this evaluation sample 15 is measured according to Japanese Industrial Standards (former Japanese Industrial Standards; JIS) K7136:2000. Haze H can be measured using a commercially available haze meter (eg, HM-150N manufactured by Murakami Color Research Laboratory).
  • HM-150N manufactured by Murakami Color Research Laboratory
  • Haze H is preferably 0.9% or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.38% or less, It may be 0.35% or less, further 0.33% or less.
  • the optical layered body 10A having a haze H of 1.0% or less is suitable for suppressing unnecessary coloring of the light from the image display device even when subjected to a high-temperature environment.
  • the lower limit of haze H is not particularly limited, and is, for example, 0.1%.
  • the haze H 0 measured by the same method as the test method 1 except that the evaluation sample 15 was not placed in a heating environment is not particularly limited. % or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.38% or less, 0.35% or less, or even 0.33 % or less.
  • the lower limit of haze H 0 is not particularly limited, and is, for example, 0.1%.
  • the value obtained by subtracting the haze H 0 from the haze H (H ⁇ H 0 ) is not particularly limited, and is, for example, 0.5% or less, 0.4% or less, 0.3% or less, or 0.2%. 0.1% or less, 0.08% or less, 0.05% or less, or even 0.02% or less.
  • the lower limit of the value of HH 0 is, for example, -0.05%.
  • test method 2 The optical layered body 10A is sandwiched between two alkali-free glasses to prepare an evaluation sample. The samples for evaluation are heated at 105° C. for 250 hours. A light source (CIE standard light source D65) in which an additional polarizing plate forming a crossed Nicols relationship with the absorption axis of the polarizing plate 2 in the optical laminate 10A is arranged is prepared.
  • CIE standard light source D65 CIE standard light source D65
  • Test Method 2 is described in detail below.
  • an evaluation sample 15 is produced by the same method as the test method 1.
  • the size of the optical layered body 10A is, for example, 200 mm long ⁇ 50 mm wide.
  • the transparent adhesive sheet 21 and the alkali-free glass 20 used in test method 2 have negligible influence on the hue of transmitted light.
  • the evaluation sample 15 is allowed to cool to room temperature (for example, 23° C.).
  • a light source 23 CIE standard light source D65
  • an additional polarizing plate 22 is prepared.
  • the light source 23 is arranged so as to face the surface of the evaluation sample 15 (the surface of the non-alkali glass 20A) on the adhesive sheet 1 side of the polarizing plate 2 .
  • An additional polarizer 22 is arranged between the light source 23 and the evaluation sample 15 to form a crossed Nicols relationship with respect to the absorption axis of the polarizer 2 .
  • the light from the light source 23 is made incident on the surface of the non-alkali glass 20A through the additional polarizing plate 22 .
  • the light from the light source 23 is incident on the additional polarizing plate 22, and the transmitted light transmitted through the additional polarizing plate 22 is incident on the surface of the alkali-free glass 20A.
  • the spectral transmittance in the wavelength range of 360 nm to 740 nm is specified for the transmitted light transmitted through the evaluation sample 15, and the tristimulus values (X, Y and Z) in the XYZ color system (CIE1931) are specified from the spectral transmittance. do.
  • Tristimulus values are defined in detail in JIS Z8701:1999.
  • the a * value and b * value are specified by the following formulas (i) and (ii) defined in JIS Z8781-4:2013.
  • the above a * value is preferably -0.2 or more and 0.5 or less, more preferably -0.1 or more and 0.4 or less.
  • the above b * value is preferably -1.2 or more and 0.3 or less, more preferably -1.0 or more and 0.1 or less.
  • the adhesive sheet 1 has a surface resistance value R of 1.0 ⁇ 10 10 ⁇ / ⁇ or less.
  • the pressure-sensitive adhesive sheet 1 having such a low surface resistance value R can prevent display defects due to electrification of an image display device even in an environment where static electricity is likely to occur.
  • the surface resistance value R means the surface resistance value of the pressure-sensitive adhesive sheet 1 before being subjected to a humidifying treatment, which will be described later.
  • the surface resistance value R is, for example, the surface resistance value immediately after the adhesive sheet 1 is produced.
  • the surface resistance value R of the adhesive sheet 1 is 1.0 ⁇ 10 9 ⁇ / ⁇ or less, 8.0 ⁇ 10 8 ⁇ / ⁇ or less, 5.0 ⁇ 10 8 ⁇ / ⁇ or less, 2.0 ⁇ 10 8 ⁇ or less. / ⁇ or less, 1.0 ⁇ 10 8 ⁇ / ⁇ or less, 8.0 ⁇ 10 7 ⁇ / ⁇ or less, 5.0 ⁇ 10 7 ⁇ / ⁇ or less, or 2.0 ⁇ 10 7 ⁇ / ⁇ or less. There may be.
  • the lower limit of the surface resistance value R is not particularly limited, and is, for example, 1.0 ⁇ 10 6 ⁇ / ⁇ or more, and may be 1.0 ⁇ 10 7 ⁇ / ⁇ or more.
  • the surface resistance value R should be 5.0 ⁇ 10 6 ⁇ / ⁇ or more from the viewpoint of suppressing malfunction of the touch sensor. Preferably, it is more preferably 1.0 ⁇ 10 7 ⁇ / ⁇ or more.
  • the surface resistance value R of the pressure-sensitive adhesive sheet 1 can be measured, for example, using a high resistance resistivity meter (for example, Hiresta series manufactured by Mitsubishi Chemical Analytic Tech) under the conditions of an applied voltage of 250 V and an applied time of 10 seconds. can.
  • the pressure-sensitive adhesive sheet 1 preferably has a low surface resistance value even after being exposed to a humid environment.
  • the surface resistance value R 1 of the pressure-sensitive adhesive sheet 1 after humidification treatment according to test method 3 below is, for example, 1.0 ⁇ 10 10 ⁇ / ⁇ or less.
  • Test Method 3 below may be performed on the optical layered body 10A.
  • PSA sheet 1 is placed in a humidified environment at 65°C and 95% RH for 250 hours. Further, the adhesive sheet 1 is placed in an environment of 40° C. for 1 hour and dried.
  • the surface resistance value R 1 of the adhesive sheet 1 is, for example, 1.0 ⁇ 10 9 ⁇ / ⁇ or less, 8.0 ⁇ 10 8 ⁇ / ⁇ or less, 5.0 ⁇ 10 8 ⁇ / ⁇ or less, 2.0. ⁇ 10 8 ⁇ / ⁇ or less, 1.0 ⁇ 10 8 ⁇ / ⁇ or less, 8.0 ⁇ 10 7 ⁇ / ⁇ or less, 5.0 ⁇ 10 7 ⁇ / ⁇ or less, or 2.0 ⁇ 10 7 ⁇ or less / ⁇ or less.
  • the lower limit of the surface resistance value R 1 is not particularly limited, and is, for example, 1.0 ⁇ 10 6 ⁇ / ⁇ or more, and may be 1.0 ⁇ 10 7 ⁇ / ⁇ or more.
  • the surface resistance value R 1 is 5.0 ⁇ 10 6 ⁇ / ⁇ or more from the viewpoint of suppressing malfunction of the touch sensor. is preferable, and 1.0 ⁇ 10 7 ⁇ / ⁇ or more is more preferable.
  • the ratio R 1 /R of the surface resistance value R 1 ( ⁇ / ⁇ ) after humidification treatment to the surface resistance value R ( ⁇ / ⁇ ) before humidification treatment is not particularly limited, and is, for example, 10 or less. and may be 8 or less, 5 or less, 4 or less, 3 or less, 2 or less, 1.5 or less, 1.4 or less, 1.3 or less, 1.2 or less, or even 1.1 or less.
  • the lower limit of the ratio R 1 /R is not particularly limited and is, for example, 0.95. When the ratio R 1 /R is 10 or less, deterioration of antistatic performance over time can be suppressed.
  • Adhesive sheet 1 is a sheet formed from adhesive composition (I) containing polymer (A).
  • the dielectric constant P of the polymer (A) at a frequency of 100 kHz is 5.0 or more.
  • the dielectric constant P can be measured by the following method. First, a test piece having a thickness of 30 ⁇ m is produced, which is composed only of the polymer (A). For this test piece, the dielectric constant at a frequency of 100 kHz is measured according to JIS K6911:1995. The obtained measured value can be regarded as the dielectric constant P.
  • the details of the conditions for measuring the dielectric constant are as follows.
  • Measurement method Capacitance method (Apparatus: 4294A Precision Impedance Analyzer manufactured by Agilent Technologies) Electrode configuration: Aluminum plate with a diameter of 12.1 mm and a thickness of 0.5 mm Counter electrode: 3 oz copper plate Measurement environment: 23 ⁇ 1° C., 52 ⁇ 1% RH
  • Relative permittivity P is preferably 5.5 or more, 6.0 or more, 6.5 or more, 7.0 or more, 7.3 or more, 7.4 or more, 7.5 or more, 7.6 or more, It may be 7.7 or more, or even 7.8 or more.
  • the higher the dielectric constant P the more the adhesion of the adhesive sheet 1 to a transparent conductive layer such as alkali-free glass or ITO tends to improve, and the tendency to suppress peeling when a durability test is performed.
  • the upper limit of the dielectric constant P is not particularly limited, and is 10, for example.
  • the polymer (A) examples include (meth)acrylic polymers, urethane polymers, silicone polymers, rubber polymers, etc., preferably (meth)acrylic polymers.
  • the pressure-sensitive adhesive composition (I) contains, for example, a (meth)acrylic polymer as a main component.
  • the pressure-sensitive adhesive composition (I) is an acrylic pressure-sensitive adhesive composition.
  • a main component means the component with the largest content rate in a composition.
  • the content of the main component is, for example, 50% by weight or more, and may be 60% by weight or more, 70% by weight or more, 75% by weight or more, or even 80% by weight or more.
  • the (meth)acrylic polymer means a polymer having structural units derived from (meth)acrylic monomers such as (meth)acrylate.
  • (Meth)acryl means acryl and methacryl.
  • (meth)acrylate means acrylate and methacrylate.
  • the polymer (A) preferably has structural units derived from the alkoxy group-containing monomer (A1).
  • the polymer (A) may have one or more structural units derived from the alkoxy group-containing monomer (A1).
  • Examples of the alkoxy group-containing monomer (A1) include (meth)acrylates represented by the following chemical formula (1).
  • R 1 in Formula (1) is a hydrogen atom or a methyl group.
  • R 2 in formula (1) is an alkyl group.
  • the alkyl group may be linear or branched.
  • R 2 is preferably a linear alkyl group. Examples of R 2 are methyl and ethyl groups.
  • n in formula (1) is an integer of 1-30, preferably an integer of 1-5.
  • Examples of (meth)acrylates represented by formula (1) include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl (meth)acrylate, methoxytriethylene glycol. (meth)acrylates and methoxypolyethylene glycol (meth)acrylates, preferably 2-methoxyethyl acrylate (MEA).
  • the structural unit derived from the (meth)acrylate of formula (1) can contribute to reducing the surface resistance value of the pressure-sensitive adhesive sheet 1 . Specifically, according to the structural unit derived from (meth)acrylate of the formula (1), the surface resistance value of the pressure-sensitive adhesive sheet 1 tends to be reduced while suppressing the blending amount of the conductive agent described later.
  • the content of structural units derived from the alkoxy group-containing monomer (A1), particularly the structural units derived from the (meth)acrylate of formula (1) is, for example, 15% by weight or more, 20% by weight or more, 30% by weight or more, 40% by weight or more, 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, or even 95% by weight or more good.
  • the upper limit of the content of structural units derived from the alkoxy group-containing monomer (A1) is not particularly limited, and is, for example, 99% by weight.
  • the polymer (A) may have structural units other than the structural units derived from the alkoxy group-containing monomer (A1).
  • the structural unit is derived from the monomer (A2) copolymerizable with the alkoxy group-containing monomer (A1).
  • the polymer (A) may have one or more of such structural units.
  • the monomer (A2) is a hydroxyl group-containing monomer.
  • the hydroxyl group-containing monomer may be a hydroxyl group-containing (meth)acrylic monomer.
  • hydroxyl-containing monomers are 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl ( hydroxyalkyl (meth)acrylates such as meth)acrylates, 10-hydroxydecyl (meth)acrylate and 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methylacrylate.
  • 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred, and 4-hydroxybutyl (meth)acrylate is more preferred.
  • the content of structural units derived from hydroxyl group-containing monomers in the polymer (A) is, for example, 1% to 5% by weight, and may be 3% by weight or less, or even 2% by weight or less.
  • the monomer (A2) is a (meth)acrylic monomer having an alkyl group having 1 to 30 carbon atoms in its side chain.
  • the alkyl group may be linear or branched.
  • Examples of (meth)acrylic monomers having alkyl groups in side chains include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, and n-butyl (meth)acrylate.
  • the content of the structural unit derived from the (meth)acrylic monomer having an alkyl group in the side chain in the polymer (A) is, for example, 80% by weight or less, 70% by weight or less, 60% by weight or less, 50% by weight. %, 40% by weight or less, 30% by weight or less, 20% by weight or less, or 10% by weight or less, or even 0% by weight (without including the structural unit).
  • the monomer (A2) may be an aromatic ring-containing monomer, a carboxyl group-containing monomer, an amino group-containing monomer, or an amide group-containing monomer.
  • the aromatic ring-containing monomer may be an aromatic ring-containing (meth)acrylic monomer.
  • aromatic ring-containing monomers include phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, ethylene oxide-modified nonylphenol (meth) acrylate, hydroxyethylated ⁇ - naphthol (meth)acrylate and biphenyl (meth)acrylate.
  • carboxyl group-containing monomers examples include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid.
  • amino group-containing monomers are N,N-dimethylaminoethyl (meth)acrylate and N,N-dimethylaminopropyl (meth)acrylate.
  • amide group-containing monomers are (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N- Butyl (meth)acrylamide, N-hexyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methylol-N-propane (meth)acrylamide, aminomethyl (meth)acrylamide, aminoethyl (meth)acrylamide, mercaptomethyl acrylamide-based monomers such as (meth)acrylamide and mercaptoethyl (meth)acrylamide; N-acryloyl heterocycles such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine and N-(meth)acryloylpyrrolidine and N-vinyl group-containing lactam monomers such as N-vinylpyrrolidon
  • the monomer (A2) may be a polyfunctional monomer.
  • multifunctional monomers are hexanediol di(meth)acrylate (1,6-hexanediol di(meth)acrylate), butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (Poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri( polyfunctional acrylates such as meth)acrylates, tetramethylolmethane tri(meth)acrylates, allyl (meth)acrylates, vinyl (meth)acrylates, epoxy acrylates, polyester acrylates and urethane acrylates; and divin
  • the content of structural units derived from aromatic ring-containing monomers is, for example, 3% to 25% by weight, preferably 8% to 24% by weight, more preferably 10% by weight. % to 22% by weight, more preferably 12% to 18% by weight.
  • the content of structural units derived from aromatic ring-containing monomers may be 10% by weight or less, or 8% by weight or less, depending on the case.
  • Polymer (A) may not contain a structural unit derived from an aromatic ring-containing monomer.
  • the total content of constituent units derived from the carboxyl group-containing monomer, amino group-containing monomer, amide group-containing monomer and polyfunctional monomer in the polymer (A) is preferably 20% by weight or less. , more preferably 10% by weight or less, and still more preferably 8% by weight or less.
  • the total content is, for example, 0.01% by weight or more, and may be 1% by weight or more, 2% by weight or more, or even 3% by weight or more. Polymer (A) may not contain these structural units.
  • the content of the structural unit derived from the carboxyl group-containing monomer may be less than 0.1% by weight, or even 0% by weight (excluding the structural unit even) good.
  • the content of structural units derived from a carboxyl group-containing monomer may be less than 0.1% by weight, even when the pressure-sensitive adhesive sheet 1 is in contact with a metal oxide such as ITO, the metal oxide It tends to suppress the corrosion of things.
  • the content of structural units derived from a carboxyl group-containing monomer in the polymer is less than 0.1% by weight, the conditions of 95 ° C. or higher required for high-temperature tests, especially automotive displays, etc.
  • the adhesive sheet tends to peel off easily.
  • the dielectric constant P of the polymer (A) to 5.0 or more, the content of structural units derived from the carboxyl group-containing monomer in the polymer (A) is less than 0.1% by weight, there is a tendency that peeling can be suppressed, and both high-temperature durability and corrosion resistance can be easily achieved.
  • Examples of other monomers (A2) include nitrile group-containing (meth)acrylates such as (meth)acrylonitrile; epoxy group-containing monomers such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate; vinyl sulfonic acid group-containing monomers such as sodium sulfonate; phosphate group-containing monomers; alicyclic hydrocarbon groups such as cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate and isobornyl (meth)acrylate; vinyl esters such as vinyl acetate and vinyl propionate; aromatic vinyl compounds such as styrene and vinyl toluene; olefins such as ethylene, propylene, butadiene, isoprene and isobutylene, or dienes; vinyl ethers such as alkyl ethers; and vinyl chloride.
  • nitrile group-containing (meth)acrylates such as (me
  • the total content of structural units derived from the other monomer (A2) in the polymer (A) is, for example, 30% by weight or less, may be 10% by weight or less, or is 0% by weight (not including the structural unit).
  • the polymer (A) can be formed by polymerizing one or more of the above monomers by a known method.
  • a monomer and a partial polymer of the monomer may be polymerized.
  • Polymerization can be carried out, for example, by solution polymerization, emulsion polymerization, bulk polymerization, thermal polymerization, or active energy ray polymerization. Solution polymerization and active energy ray polymerization are preferred from the viewpoint of forming a pressure-sensitive adhesive sheet with excellent optical transparency.
  • Polymerization is preferably carried out while avoiding contact of the monomer and/or partial polymer with oxygen. Polymerization in shutdown can be employed.
  • the polymer (A) to be formed may be in any form such as a random copolymer, a block copolymer, a graft copolymer and the like.
  • the polymerization system forming the polymer (A) may contain one or more polymerization initiators.
  • the type of polymerization initiator can be selected depending on the polymerization reaction, and may be, for example, a thermal polymerization initiator or a photopolymerization initiator.
  • Solvents used for solution polymerization include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as methylcyclohexane; and ketones such as methyl ethyl ketone and methyl isobutyl ketone.
  • the solvent is not limited to the above examples.
  • the solvent may be a mixed solvent of two or more solvents.
  • Polymerization initiators used for solution polymerization are, for example, azo polymerization initiators, peroxide polymerization initiators, and redox polymerization initiators.
  • Peroxide polymerization initiators are, for example, dibenzoyl peroxide and t-butyl permaleate.
  • the azo polymerization initiator disclosed in JP-A-2002-69411 is preferable.
  • the azo polymerization initiator for example, 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis-2-methylbutyronitrile, 2,2'-azobis (2-methylpropion acid) dimethyl, 4,4'-azobis-4-cyanovaleric acid.
  • AIBN 2,2'-azobisisobutyronitrile
  • 2,2'-azobis-2-methylbutyronitrile 2,2'-azobis (2-methylpropion acid) dimethyl
  • 4,4'-azobis-4-cyanovaleric acid is not limited to the above examples.
  • the active energy rays used for active energy ray polymerization are, for example, ionizing radiation such as ⁇ -rays, ⁇ -rays, ⁇ -rays, neutron beams and electron beams, and ultraviolet rays.
  • the active energy rays are preferably ultraviolet rays.
  • Polymerization by irradiation with ultraviolet rays is also called photopolymerization.
  • a polymerization system for active energy ray polymerization typically contains a photopolymerization initiator. Polymerization conditions for active energy polymerization are not limited as long as the polymer (A) is formed.
  • Photopolymerization initiators include, for example, benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, ⁇ -ketol-based photopolymerization initiators, aromatic sulfonyl chloride-based photopolymerization initiators, and photoactive oxime-based photopolymerization initiators. , a benzoin-based photopolymerization initiator, a benzyl-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, a ketal-based photopolymerization initiator, and a thioxanthone-based photopolymerization initiator.
  • the photopolymerization initiator is not limited to the above examples.
  • Benzoin ether-based photopolymerization initiators include, for example, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, anisolemethyl is ether.
  • Acetophenone-based photopolymerization initiators include, for example, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, 4-(t-butyl)dichloro Acetophenone.
  • Examples of ⁇ -ketol photopolymerization initiators are 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one.
  • the aromatic sulfonyl chloride photopolymerization initiator is, for example, 2-naphthalenesulfonyl chloride.
  • a photoactive oxime-based photopolymerization initiator is, for example, 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime.
  • a benzoin-based photopolymerization initiator is, for example, benzoin.
  • a benzylic photopolymerization initiator is, for example, benzyl.
  • benzophenone-based photopolymerization initiators examples include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, and ⁇ -hydroxycyclohexylphenyl ketone.
  • a ketal photopolymerization initiator is, for example, benzyl dimethyl ketal.
  • Thioxanthone-based photopolymerization initiators are, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
  • the amount of the photopolymerization initiator used is, for example, 0.01 to 1 part by weight, and may be 0.05 to 0.5 part by weight, based on 100 parts by weight of the total amount of the monomers.
  • the weight average molecular weight (Mw) of the polymer (A) is, for example, 1-3 million, preferably 1.8-3 million.
  • the weight-average molecular weight of the polymer (A) is 1,000,000 to 3,000,000, cracks in the pressure-sensitive adhesive sheet can be suppressed, and there is a tendency to suppress increase in viscosity and occurrence of gelation.
  • the ratio (Mw/Mn) of the weight average molecular weight Mw to the number average molecular weight Mn of the polymer (A) is, for example, 20 or less, preferably 10 or less, more preferably 7 or less, and still more preferably 2.5. ⁇ 5.
  • the polymer (A) having Mw/Mn of 20 or less not only can the pressure-sensitive adhesive sheet 1 be easily adjusted to an appropriate hardness, but also foaming and peeling of the pressure-sensitive adhesive sheet 1 can be suppressed during the heating test.
  • This polymer (A) also tends to improve the workability of the pressure-sensitive adhesive sheet 1 .
  • the weight average molecular weight (Mw) and Mw/Mn of polymers and oligomers herein are values (converted to polystyrene) based on GPC (gel permeation chromatography) measurement.
  • the glass transition temperature (Tg) of the polymer (A) is, for example, -50°C or lower, preferably -52°C or lower, and more preferably -55°C or lower.
  • the lower limit of Tg of polymer (A) is, for example, -75°C.
  • the Tg of the polymer (A) is a value obtained by averaging the Tg of a homopolymer for each monomer that forms the structural unit of the polymer (A) and taking into account the content of the structural unit. is.
  • the content of the polymer (A) in the pressure-sensitive adhesive composition (I) is, in terms of solid content, for example, 50% by weight or more, 60% by weight or more, 70% by weight or more, or even 80% by weight or more. good.
  • the upper limit of the content is, for example, 99% by weight or less, and may be 97% by weight or less, 95% by weight or less, 93% by weight or less, or even 90% by weight or less.
  • the adhesive composition (I) further contains, for example, a conductive agent (antistatic agent).
  • the pressure-sensitive adhesive composition (I) may contain one or more conductive agents.
  • conductive agents are ionic compounds such as salts.
  • the ionic compound may be an ionic liquid that is liquid at normal temperature (25° C.).
  • the melting point of the ionic compound may be below 25°C, between 25°C and 90°C, or above 90°C.
  • the melting point of the ionic compound is preferably less than 25°C or greater than 90°C.
  • the melting point of the ionic compound is less than 25°C, the risk of the ionic compound precipitating and affecting the appearance can be reduced.
  • the melting point of the ionic compound is higher than 90° C., the ionic compound tends to be difficult to bleed from the adhesive sheet 1 .
  • Examples of ionic compounds include inorganic cation salts and organic cation salts.
  • Inorganic cation salts are specifically inorganic cation-anion salts.
  • Examples of cations contained in inorganic cation salts include alkali metal ions.
  • Alkali metal ions include lithium ions, sodium ions, and potassium ions, with lithium ions being preferred.
  • the inorganic cation salt is preferably a lithium salt.
  • Anions contained in the inorganic cation salt include Cl ⁇ , Br ⁇ , I ⁇ , AlCl 4 ⁇ , Al 2 Cl 7 ⁇ , BF 4 ⁇ , PF 6 ⁇ , ClO 4 ⁇ , NO 3 ⁇ , CH 3 COO ⁇ , CF3COO- , CH3SO3- , CF3SO3- , ( CF3SO2 ) 3C- , AsF6- , SbF6- , NbF6- , TaF6- , ( CN ) 2N- , C4F9SO3- , C3F7COO- , ( CF3SO2 ) ( CF3CO ) N- , -O3S ( CF2 ) 3SO3- , and the following general formulas ( a ) to Anions represented by (d) can be mentioned.
  • the anion contained in the inorganic cation salt is preferably a fluorine-containing anion, more preferably a fluorine-containing imide anion.
  • fluorine-containing imide anions include imide anions having a perfluoroalkyl group.
  • fluorine-containing imide anions examples include (CF 3 SO 2 )(CF 3 CO)N ⁇ and anions represented by the above general formulas (a), (b) or (d), preferably ( ( perfluoroalkylsulfonyl )imides represented by general formula (a ) such as CF3SO2 ) 2N-, ( C2F5SO2 ) 2N- , and more preferably ( CF3SO2 ) 2 ; Bis(trifluoromethanesulfonyl)imide represented by N- .
  • Preferred inorganic cation salts include, for example, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI).
  • the organic cation salt is specifically an organic cation-anion salt.
  • Examples of cations contained in organic cation salts include organic oniums containing organic groups.
  • Examples of the onium contained in the organic onium include nitrogen-containing onium, sulfur-containing onium, and phosphorus-containing onium, preferably nitrogen-containing onium and sulfur-containing onium.
  • Nitrogen-containing oniums include ammonium cations, piperidinium cations, pyrrolidinium cations, pyridinium cations, cations having a pyrroline skeleton, cations having a pyrrole skeleton, imidazolium cations, tetrahydropyrimidinium cations, dihydropyrimidinium cations, A pyrazolium cation, a pyrazolinium cation, etc. are mentioned.
  • sulfur-containing onium include sulfonium cations.
  • phosphorus-containing onium include phosphonium cations.
  • organic groups contained in organic onium include alkyl groups, alkoxyl groups, and alkenyl groups.
  • Specific examples of preferred organic oniums include tetraalkylammonium cations (eg, tributylmethylammonium cations), alkylpiperidinium cations, alkylpyrrolidinium cations, and the like.
  • organic cation salts examples include those described above for inorganic cations.
  • Preferred organic cation salts include, for example, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, trimethylbutylammonium bis(trifluoromethanesulfonyl)imide and the like.
  • an inorganic cation salt and an organic cation salt may be used in combination.
  • the amount of the conductive agent is, for example, 0.5 parts by weight or more, 1.0 parts by weight or more, 2.0 parts by weight or more, 3.0 parts by weight or more, and further may be 4.0 parts by weight or more. 8.
  • the amount of the conductive agent compounded is, for example, 20 parts by weight or less, 15 parts by weight or less, 10 parts by weight or less, less than 10 parts by weight, or 9.0 parts by weight or less with respect to 100 parts by weight of the polymer (A). It may be 0 parts by weight or less, 7.0 parts by weight or less, 6.0 parts by weight or less, or even 5.0 parts by weight or less.
  • the amount of the conductive agent may be 5.0 to 10 parts by weight with respect to 100 parts by weight of the polymer (A).
  • the dielectric constant P of the polymer (A) is 5.0 or higher.
  • a polymer (A) having such a high dielectric constant P can promote ionization of a conductive agent, particularly an ionic compound, and improve ionic conductivity. That is, the polymer (A) tends to reduce the surface resistance value of the pressure-sensitive adhesive sheet 1 while suppressing the blending amount of the conductive agent. Furthermore, the polymer (A) tends to suppress the deposition of the conductive agent from the pressure-sensitive adhesive sheet 1 in a high-temperature environment.
  • the haze H measured by the test method 1 described above can be reduced, and furthermore, the tendency of suppressing the occurrence of unnecessary coloring of the light from the image display device.
  • the pressure-sensitive adhesive composition (I) may contain other additives.
  • additives include cross-linking agents, silane coupling agents, coloring agents such as pigments and dyes, UV absorbers, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, rework improvers, softening agents, agents, antioxidants, anti-aging agents, light stabilizers, polymerization inhibitors, rust inhibitors, inorganic fillers, organic fillers, metal powders and other powders, particles, and foils.
  • the additive can be blended in an amount of, for example, 10 parts by weight or less, preferably 5 parts by weight or less, and more preferably 1 part by weight or less with respect to 100 parts by weight of the polymer (A).
  • cross-linking agents are organic cross-linking agents and multifunctional metal chelates.
  • examples of organic cross-linking agents are isocyanate cross-linking agents, peroxide cross-linking agents, epoxy cross-linking agents and imine cross-linking agents.
  • the organic cross-linking agent and polyfunctional metal chelate can be used for both solvent-type and active energy ray-curable pressure-sensitive adhesive compositions.
  • the cross-linking agent is preferably a peroxide-based cross-linking agent or an isocyanate-based cross-linking agent.
  • a peroxide-based cross-linking agent and an isocyanate-based cross-linking agent may be used in combination.
  • the pressure-sensitive adhesive composition (I) preferably contains a peroxide cross-linking agent.
  • Peroxide cross-linking agents include, for example, di(2-ethylhexyl)peroxydicarbonate, di(4-t-butylcyclohexyl)peroxydicarbonate, di-sec-butylperoxydicarbonate, t-butyl peroxydicarbonate, oxyneodecanoate, t-hexyl peroxypivalate, t-butyl peroxypivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutylperoxy- 2-ethylhexanoate, di(4-methylbenzoyl) peroxide, benzoyl peroxide, t-butylperoxyisobutyrate, 1,1-di(t-hexylperoxy)cyclohexane, etc., and crosslinking reaction Benzoyl peroxide is preferred due to its superior efficiency.
  • isocyanate cross-linking agents include aromatic isocyanate compounds such as tolylene diisocyanate, chlorophenylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate and polymethylene polyphenyl isocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, and hydrogenated diphenylmethane diisocyanate. and alicyclic isocyanate compounds such as isophorone diisocyanate; and aliphatic isocyanate compounds such as butylene diisocyanate, tetramethylene diisocyanate and hexamethylene diisocyanate.
  • aromatic isocyanate compounds such as tolylene diisocyanate, chlorophenylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate and polymethylene polyphenyl isocyanate
  • the isocyanate-based cross-linking agent is a compound (adduct) obtained by adding the above-mentioned isocyanate compound to a polyhydric alcohol compound such as trimethylolpropane; A compound subjected to an addition reaction with a polyol; a derivative of the isocyanate compound such as an isocyanurate compound may be used.
  • derivatives include trimethylolpropane/tolylene diisocyanate trimer adduct (eg, Nippon Polyurethane Industry Co., Ltd., Coronate L), trimethylolpropane/hexamethylene diisocyanate trimer adduct (eg, Nippon Polyurethane Industry Co., Ltd., Coronate HL ), an isocyanurate of hexamethylene diisocyanate (for example, Coronate HX manufactured by Nippon Polyurethane Industry Co., Ltd.).
  • the pressure-sensitive adhesive composition (I) contains a cross-linking agent
  • its amount is, for example, 0.01 to 10 parts by weight, 0.1 to 5 parts by weight, 0 .1 to 3 parts by weight, or even 0.1 to 1 part by weight. If the amount of the cross-linking agent is too small, foaming may occur in the durability test, and workability may deteriorate. If the amount of the cross-linking agent is too large, peeling may occur in the durability test, or the surface resistance value may increase to deteriorate the antistatic property.
  • silane coupling agents include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2-(3,4- Epoxy group-containing silane coupling agents such as epoxycyclohexyl)ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N- Amino group-containing silane coupling agents such as (1,3-dimethylbutylidene)propylamine and N-phenyl- ⁇ -aminopropyltrimethoxysilane; 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane; (Meth)acrylic group-containing silane coupling agents such as; isocyanate group-
  • the amount is, for example, 5 parts by weight or less, 3 parts by weight or less, 1 part by weight or less, relative to 100 parts by weight of the polymer (A). It may be 0.5 parts by weight or less, 0.2 parts by weight or less, 0.1 parts by weight or less, or even 0.05 parts by weight or less.
  • Types of the pressure-sensitive adhesive composition (I) are, for example, emulsion type, solvent type (solution type), active energy ray-curable type (light-curing type), and heat-melting type (hot-melt type).
  • the adhesive composition (I) may be solvent-based, active energy ray-curable, or solvent-based.
  • the solvent-based pressure-sensitive adhesive composition (I) may not contain a photocuring agent such as an ultraviolet curing agent.
  • the adhesive sheet 1 can be produced from the adhesive composition (I) by the following method.
  • the solvent type for example, the pressure-sensitive adhesive composition (I) or a mixture of the pressure-sensitive adhesive composition (I) and a solvent is applied to a base film to form a coating film, and the formed coating film is dried. An adhesive sheet 1 is formed.
  • the pressure-sensitive adhesive composition (I) is thermally cured by heat during drying.
  • the active energy ray-curable type for example, a monomer (group) that becomes the polymer (A) by polymerization, and, if necessary, a partial polymer of the monomer (group), a polymerization initiator , an additive, a solvent, and the like are applied to a substrate film, and the formed coating film is irradiated with an active energy ray to form an adhesive sheet 1 .
  • the solvent may be removed by drying the coating film before irradiation with the active energy ray.
  • the base film may be a film (release liner) whose coating surface has been subjected to a release treatment.
  • the adhesive sheet 1 formed on the base film can be transferred to any layer.
  • the base film may be the polarizing plate 2, and in this case, an optical laminate 10A including the adhesive sheet 1 and the polarizing plate 2 is obtained.
  • Coating is, for example, roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, extrusion coating using a die coater, or the like. can be implemented by
  • the drying temperature after coating is, for example, 40 to 200°C.
  • the drying time is, for example, 5 seconds to 20 minutes, and may be 5 seconds to 10 minutes, or even 10 seconds to 5 minutes.
  • the drying temperature and drying time when drying after coating may be within the above ranges.
  • composition and mixture to be applied to the base film preferably have a viscosity suitable for handling and coating. Therefore, for the active energy ray-curable type, the mixture to be applied preferably contains a partial polymer of the monomer (group).
  • the thickness of the adhesive sheet 1 is, for example, 2 ⁇ m to 55 ⁇ m, and may be 2 ⁇ m to 30 ⁇ m, 5 ⁇ m to 25 ⁇ m, and further 10 ⁇ m to 20 ⁇ m.
  • the adhesive strength of the adhesive sheet 1 to glass is preferably 1.0 N/25 mm or more, more preferably 1.5 N/25 mm or more, and still more preferably 2.0 N/25 mm or more. When the adhesive strength is within such a range, the adhesiveness to the image display panel is excellent and the reworkability is excellent.
  • the upper limit of adhesive strength is, for example, 6.0 N/25 mm.
  • the maximum domain diameter within the range of 6 ⁇ m long ⁇ 6 ⁇ m wide is preferably 150 nm or less.
  • a domain means an island-like phase of a sea-island structure formed on a pressure-sensitive adhesive sheet. Domains are usually observed as substantially circular islands.
  • the maximum diameter of the domain can be specified by the following method. First, the adhesive sheet 1 is cut and the cross section is observed with a TEM. The enlargement magnification at this time is, for example, 20,000 times. In the TEM image, a domain existing within a range of 6 ⁇ m long ⁇ 6 ⁇ m wide is specified. For each identified domain, identify the diameter (diameter of the smallest circle that can enclose the domain). Among the specified diameters, the largest value can be regarded as the maximum diameter of the domain.
  • the maximum diameter of the domain is preferably 70 nm or less. In this embodiment, it is particularly preferable that no domain is observed at a magnification of 20,000 times when the cross section of the pressure-sensitive adhesive sheet 1 is observed with a TEM.
  • the polarizing plate 2 is, for example, a laminate including a polarizer and a protective film (transparent protective film).
  • the transparent protective film is arranged, for example, in contact with the main surface (the surface having the widest area) of the layered polarizer.
  • a polarizer may be placed between two transparent protective films.
  • the polarizer is not particularly limited. Uniaxially stretched after adsorbing a dichroic substance such as a dye; oriented polyene films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride;
  • the polarizer is preferably made of a polyvinyl alcohol film and a dichroic substance such as iodine.
  • the thickness of the polarizer is not particularly limited, and may be, for example, 80 ⁇ m or less, 50 ⁇ m or less, or even 30 ⁇ m or less.
  • the lower limit of the thickness of the polarizer is not particularly limited, and may be, for example, 1 ⁇ m, 10 ⁇ m, or even 20 ⁇ m.
  • the polarizer may be a thin polarizer with a thickness of 10 ⁇ m or less, preferably 1-7 ⁇ m.
  • a thin polarizer has little unevenness in thickness and is excellent in visibility.
  • a thin polarizer is suppressed in dimensional change and has excellent durability.
  • a thin polarizer can make the polarizing plate 2 thin.
  • thermoplastic resin that is excellent in transparency, mechanical strength, thermal stability, water barrier properties, isotropy, etc.
  • 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 Polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof can be used.
  • cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic Polyolefin resins (norbornene-based resins), polyarylate resins, polys
  • the material of the transparent protective film may be a thermosetting resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, or silicone, or an ultraviolet curable resin.
  • a transparent protective film made of a thermoplastic resin is attached to one main surface of the polarizer via an adhesive, and a thermosetting resin or ultraviolet light is applied to the other main surface of the polarizer.
  • a transparent protective film made of a curable resin may be attached.
  • the transparent protective film may contain one or more optional additives. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.
  • the moisture permeability of the transparent protective film is not particularly limited, and may be 200 g/(m 2 ⁇ day) or less, or may be 50 g/(m 2 ⁇ day) or less.
  • moisture in the air can be prevented from entering the inside of the polarizing plate 2, and a change in the moisture content of the polarizing plate 2 can be suppressed.
  • the polarizing plate 2 it is possible to prevent the polarizing plate 2 from curling or changing dimensions during storage.
  • the lower the moisture permeability of the transparent protective film the more difficult it is for the conductive agent in the adhesive sheet 1 to bleed, and the more likely it is that the increase in the surface resistance of the adhesive sheet 1 over time can be suppressed.
  • Examples of materials for forming transparent protective films with low moisture permeability include polyester-based polymers, polycarbonate-based polymers, arylate-based polymers, amide-based polymers, olefin-based polymers, cyclic olefin-based polymers, (meth)acrylic-based polymers, and these.
  • polyester-based polymers polycarbonate-based polymers, arylate-based polymers, amide-based polymers, olefin-based polymers, cyclic olefin-based polymers, (meth)acrylic-based polymers, and these.
  • the moisture permeability of the transparent protective film can be measured by the following method according to the moisture permeability test (cup method) of JIS Z0208:1976.
  • a transparent protective film is cut into a diameter of 60 mm to prepare a measurement sample.
  • a measurement sample is set in a moisture-permeable cup in which about 15 g of calcium chloride is placed.
  • This moisture permeable cup is placed in a constant temperature machine set at a temperature of 40° C. and a humidity of 92% RH, and left for 24 hours to conduct a moisture permeability test.
  • the moisture permeability of the transparent protective film can be specified.
  • the thickness of the transparent protective film can be determined as appropriate, it is generally about 10 to 200 ⁇ m in terms of strength, workability such as handleability, and thinness.
  • the polarizer and transparent protective film are usually in close contact with each other via a water-based adhesive or the like.
  • water-based adhesives include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latexes, water-based polyurethanes, and water-based polyesters.
  • adhesives other than the adhesives described above include ultraviolet curing adhesives, electron beam curing adhesives, and the like.
  • the electron beam curable polarizing plate adhesive exhibits suitable adhesion to various transparent protective films.
  • the adhesive may contain a metallic compound filler.
  • a retardation film or the like can be formed on the polarizer instead of the transparent protective film.
  • the transparent protective film it is also possible to provide another transparent protective film, or to provide a retardation film or the like.
  • a hard coat layer may be provided on the surface facing the surface adhered to the polarizer, and it is also possible to apply treatments for the purpose of antireflection, antisticking, diffusion, antiglare, etc. can.
  • the single transmittance of the polarizing plate 2 is, for example, 40% to 43%.
  • the single transmittance of the polarizing plate 2 is a Y value corrected for visual sensitivity using a 2-degree field of view (C light source) of JIS Z8701:1999.
  • Single transmittance can be measured using a commercially available spectrophotometer such as DOT-3 manufactured by Murakami Color Research Laboratory.
  • the measurement wavelength of single transmittance is 380 to 700 nm (every 10 nm).
  • the polarizing plate 2 may not include the iodine permeation suppression layer.
  • the iodine permeation suppression layer is, for example, a layer having a boron-containing acrylic resin containing a structural unit derived from a monomer represented by the following formula (2), and more specifically, more than 50 parts by weight (meta)
  • X in formula (2) is selected from the group consisting of a vinyl group, a (meth)acryl 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 in formula (2) are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an optionally substituted aryl group, or a substituted represents a heterocyclic group which may have a group, and R 1 and R 2 may be linked to each other to form a ring.
  • the optical laminate 10A of the present embodiment is a polarizer, a protective layer provided on one side of the polarizer, an iodine permeation suppressing layer provided on the other side of the polarizer, and the iodine permeation suppressing layer on the opposite side of the polarizer and an adhesive layer provided
  • the iodine permeation suppressing layer is a solidified or thermoset coating film of a resin solution in an organic solvent
  • the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer contains a base polymer and an antistatic agent,
  • the base polymer has a glass transition temperature of ⁇ 50° C. or lower and a dielectric constant of 5.0 or higher at 100 kHz,
  • the pressure-sensitive adhesive layer has a surface resistance value of 1.0 ⁇ 10 9 ⁇ / ⁇ or less. Excludes polarizer.
  • the shape of the polarizing plate 2 may be, for example, rectangular in plan view, and may not be irregular. Specifically, the polarizing plate 2 does not have to have the deformed portion.
  • deformed portions include through holes, chamfered corners, and cut portions that form recesses when viewed from above. Specific examples of the recess include a shape similar to a boat, a shape similar to a bathtub, a V-shaped notch, and a U-shaped notch.
  • Another example of the deformed portion is a shape corresponding to the meter panel of an automobile. The shape includes a portion whose outer edge is arc-shaped along the rotation direction of the meter needle and whose outer edge forms a V-shape (including rounded shape) convex inward in the surface direction.
  • the optical laminate 10A of the present embodiment is A polarizing plate comprising an adhesive layer, the polarizing plate having a profile
  • the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer contains a base polymer and an antistatic agent,
  • the base polymer has a glass transition temperature of ⁇ 50° C. or lower and a dielectric constant of 5.0 or higher at 100 kHz
  • the pressure-sensitive adhesive layer has a surface resistance value of 1.0 ⁇ 10 9 ⁇ / ⁇ or less. Excludes polarizer.
  • FIG. 4 Another example of the optical laminate of this embodiment is shown in FIG.
  • the optical layered body 10B of FIG. 4 has a layered structure in which a release liner 3, an adhesive sheet 1 and a polarizing plate 2 are layered in this order. By peeling off the release liner 3, the optical laminate 10B can be used as a polarizing plate with an adhesive sheet.
  • a release liner 3 an adhesive sheet 1 and a polarizing plate 2 are layered in this order.
  • Materials constituting the release liner 3 include, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films; porous materials such as paper, cloth, and nonwoven fabric; nets, foam sheets, metal foils, and laminates thereof.
  • plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films
  • porous materials such as paper, cloth, and nonwoven fabric
  • nets, foam sheets, metal foils, and laminates thereof are preferably used because of its excellent surface smoothness.
  • the plastic film is not particularly limited as long as it is a film capable of protecting the adhesive sheet 1.
  • examples include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, and vinyl chloride copolymer. film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film and the like.
  • the thickness of the release liner 3 is usually 5-200 ⁇ m, preferably about 5-100 ⁇ m.
  • the release liner 3 may be subjected, if necessary, to silicone-based, fluorine-based, long-chain alkyl-based or fatty acid amide-based release agents, release and antifouling treatment using silica powder, etc., coating type, kneading type, vapor deposition.
  • the mold may be subjected to antistatic treatment.
  • a release treatment such as silicone treatment, long-chain alkyl treatment, fluorine treatment, etc.
  • the release film used when producing the pressure-sensitive adhesive sheet 1 may be used as the release liner 3.
  • the optical laminate 10C of FIG. 5 has a laminate structure in which a release liner 3, an adhesive sheet 1, a retardation film 5, an interlayer adhesive 4 and a polarizing plate 2 are laminated in this order. After peeling off the release liner 3, the optical layered body 10C can be used by attaching it to, for example, an image display cell.
  • the retardation film 5 a film obtained by stretching a polymer film or a film obtained by aligning and fixing a liquid crystal material can be used.
  • the retardation film 5 has birefringence in the plane and/or in the thickness direction, for example.
  • an antireflection retardation film see JP 2012-133303 [0221], [0222], [0228]
  • a viewing angle compensation retardation film JP 2012-133303 [0225], [0226]
  • oblique orientation retardation film for viewing angle compensation see JP-A-2012-133303 [0227]
  • retardation film 5 As the retardation film 5, as long as it substantially has the above functions, for example, retardation value, arrangement angle, three-dimensional birefringence, monolayer or multilayer, etc. are not particularly limited, and are known. A retardation film can be used.
  • the thickness of the retardation film 5 is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, still more preferably 1 to 9 ⁇ m, and particularly preferably 3 to 8 ⁇ m.
  • the retardation film 5 is composed of two layers, for example, a quarter-wave plate and a half-wave plate in which a liquid crystal material is oriented and fixed.
  • a known adhesive can be used for the interlayer adhesive 4 .
  • the adhesive sheet 1 may be used as the interlayer adhesive 4 .
  • the optical laminate 10D of FIG. 6 has a laminate structure in which a release liner 3, an adhesive sheet 1, a retardation film 5, an interlayer adhesive 4, a polarizing plate 2 and a protective film 6 are laminated in this order. After peeling off the release liner 3, the optical layered body 10D can be used by attaching it to, for example, an image display cell.
  • the protective film 6 has a function of protecting the polarizing plate 2, which is the outermost layer, during distribution and storage of the optical layered body 10D and when the optical layered body 10D is incorporated in an image display device. Moreover, it may be a protective film 6 that functions as a window to an external space when incorporated in an image display device.
  • Protective film 6 is typically a resin film.
  • the resin constituting the protective film 6 is, for example, polyester such as PET, polyolefin such as polyethylene and polypropylene, acrylic, cycloolefin, polyimide, and polyamide, preferably polyester.
  • the protective film 6 is not limited to the above example.
  • the protective film 6 may be a glass film or a laminated film containing a glass film.
  • the protective film 6 may be subjected to surface treatment such as antiglare, antireflection, and antistatic.
  • the protective film 6 may be bonded to the polarizing plate 2 with any adhesive. Bonding with the adhesive sheet 1 is also possible.
  • the optical layered body of the present embodiment can be distributed and stored, for example, as a wound body in which a strip-shaped optical layered body is wound, or as a sheet-shaped optical layered body.
  • the optical layered body of the present embodiment is suitable for use in image display devices, particularly in-vehicle displays, which are used in environments where static electricity is particularly likely to occur.
  • Vehicle-mounted displays include, for example, car navigation system panels, cluster panels, and mirror displays.
  • the cluster panel is a panel that displays the running speed of the vehicle, the number of revolutions of the engine, and the like.
  • FIG. 7 An example of the image display panel of this embodiment is shown in FIG.
  • An image display panel 11A in FIG. 7 includes an optical layered body 10A and further includes, for example, an image display cell 30A.
  • the optical laminate 10A is attached to the image display cell 30A with the adhesive sheet 1 interposed therebetween.
  • the optical layered body 10B, 10C or 10D of FIGS. 4 to 6 can also be used (except for the release liner 3).
  • the image display cell 30A includes an image forming layer 32, a first transparent substrate 31 and a second transparent substrate 33, for example.
  • the image forming layer 32 is arranged, for example, between the first transparent substrate 31 and the second transparent substrate 33 and is in contact with the first transparent substrate 31 and the second transparent substrate 33 respectively.
  • the adhesive sheet 1 of the optical laminate 10A is, for example, in contact with the first transparent substrate 31 of the image display cell 30A.
  • the image forming layer 32 is, for example, a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in the absence of an electric field.
  • a liquid crystal layer containing such liquid crystal molecules is suitable for an IPS (In-Plane-Switching) method.
  • the liquid crystal layer may be of TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, ⁇ type, VA (Vertical Alignment) type, or the like.
  • TN Transmission Nematic
  • STN Super Twisted Nematic
  • VA Very Alignment
  • an image display cell provided with a liquid crystal layer is sometimes referred to as a liquid crystal cell
  • an image display panel provided with a liquid crystal cell is sometimes referred to as a liquid crystal panel.
  • the image forming layer 32 may be an EL light emitting layer.
  • the thickness of the image forming layer 32 is, for example, 1.5 ⁇ m to 4 ⁇ m.
  • Examples of materials for the first transparent substrate 31 and the second transparent substrate 33 include glass and polymer.
  • a transparent substrate made of polymer is sometimes referred to as a polymer film.
  • Examples of polymers constituting the transparent substrate include polyethylene terephthalate, polycycloolefin, polycarbonate and the like.
  • the thickness of the transparent substrate made of glass is, for example, 0.1 mm to 1 mm.
  • the thickness of the transparent substrate made of polymer is, for example, 10 ⁇ m to 200 ⁇ m.
  • the image display cell 30A may further include layers other than the image forming layer 32, the first transparent substrate 31 and the second transparent substrate 33.
  • Other layers include, for example, a color filter, an easy-adhesion layer and a hard coat layer.
  • the color filter is arranged, for example, on the viewing side of the image forming layer 32, preferably between the first transparent substrate 31 and the adhesive sheet 1 of the optical layered body 10A.
  • the easy-adhesion layer and the hard coat layer are arranged on the surface of the first transparent substrate 31 or the second transparent substrate 33, for example.
  • the image display panel 11A may further include members other than the optical laminate 10A and the image display cell 30A.
  • the image display panel 11A may further include a conductive structure (not shown) electrically connected to the side surface of the optical laminate 10A.
  • the conductive structure may cover the entire side surface of the optical layered body 10A, or may partially cover the side surface of the optical layered body 10A.
  • the ratio of the area of the side surface of the optical layered body 10A covered with the conductive structure to the area of the entire side surface of the optical layered body 10A is, for example, 1% or more, preferably 3% or more.
  • Materials for the conductive structure include, for example, conductive pastes made of metals such as silver and gold; conductive adhesives; and other conductive materials.
  • the conductive structure may be a wiring extending from the side surface of the optical layered body 10A.
  • the image display panel 11A may further include an optical film other than the polarizing plate 2.
  • optical films include films used in image display devices such as polarizing plates, reflectors, anti-transmissive plates, viewing angle compensation films, and brightness enhancement films.
  • the image display panel 11A may include one or more of these optical films.
  • the polarizing plate is attached to the second transparent substrate 33 of the image display cell 30A, for example, via an adhesive sheet.
  • This polarizing plate has, for example, the configuration described above for the polarizing plate 2 .
  • the transmission axis (or absorption axis) of the polarizer is orthogonal to the transmission axis (or absorption axis) of the polarizer in the polarizing plate 2, for example.
  • the materials described above for the adhesive sheet 1 can be used as the material of the adhesive sheet for bonding the polarizing plate and the second transparent substrate 33 together.
  • the thickness of this adhesive sheet is not particularly limited, and is, for example, 1 to 100 ⁇ m, preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, still more preferably 5 to 35 ⁇ m.
  • the image display panel 11B of FIG. 8 further includes a conductive layer 40 arranged between the optical laminate 10A and the image display cell 30A.
  • the image display panel is preferably the image display panel 11A that does not include the conductive layer 40 .
  • the image display panel 11B provided with the conductive layer 40 tends to have a high reflectance, which may reduce the visibility of the display.
  • a conductive silver paste for example, is used as the conductive portion.
  • a conductive silver paste or the like is applied to the side surface of the adhesive sheet 1 to provide a conductive portion, from which other wiring, the housing of the image display device, etc. are provided.
  • the antistatic property of the image display panel can be enhanced by conducting the electric conduction to the image display panel.
  • the conductive layer 40 is, for example, a layer containing a conductive agent.
  • a conductive agent metal oxides, conductive polymers, those mentioned above for the pressure-sensitive adhesive sheet 1, and the like can be used.
  • the thickness of the conductive layer 40 is, for example, 5 nm to 180 nm.
  • the surface resistance value of the conductive layer 40 is, for example, 1.0 ⁇ 10 6 ⁇ /square to 1.0 ⁇ 10 10 ⁇ /square, preferably 1.0 ⁇ 10 8 ⁇ /square to 1.0 ⁇ 10 ⁇ /square. 9 ⁇ /square.
  • the image display panel of this embodiment may be an image display panel incorporating a touch sensing function.
  • An example of an image display panel incorporating a touch sensing function is shown in FIG.
  • the image display panel 11C of FIG. 9 includes an image display cell 30B that further includes a touch sensing electrode portion 35. As shown in FIG.
  • the touch sensing electrode portion 35 is arranged between the first transparent substrate 31 and the second transparent substrate 33 in the image display cell 30B.
  • the touch sensing electrode unit 35 has functions of touch sensor and touch drive.
  • the image display panel 11C is a so-called in-cell image display panel
  • the image display cell 30B is a so-called in-cell image display cell.
  • the touch sensing electrode section 35 may be arranged on the viewing side of the first transparent substrate 31 . That is, the image display panel 11C may be a so-called on-cell image display panel, and the image display cell 30B may be a so-called on-cell image display cell.
  • the touch sensing electrode section 35 has, for example, touch sensor electrodes 36 and touch drive electrodes 37 .
  • the touch sensor electrode 36 means a (receiving) electrode for touch detection.
  • the touch sensor electrodes 36 and the touch drive electrodes 37 can be independently formed in various patterns.
  • the touch sensor electrodes 36 and the touch drive electrodes 37 are provided independently in the X-axis direction and the Y-axis direction, respectively, and formed in a pattern in which they intersect at right angles. can be done.
  • the touch sensing electrode portion 35 the touch sensor electrodes 36 are arranged on the viewer side with respect to the touch drive electrodes 37 .
  • the touch drive electrodes 37 may be arranged on the viewing side of the touch sensor electrodes 36 .
  • the touch sensor electrodes 36 and the touch drive electrodes 37 may be integrated.
  • the touch sensing electrode portion 35 is arranged between the image forming layer 32 and the first transparent substrate 31 (on the viewer side of the image forming layer 32).
  • the touch sensing electrode section 35 may be arranged between the image forming layer 32 and the second transparent substrate 33 (on the lighting system side of the image forming layer 32).
  • the touch sensor electrodes 36 and the touch drive electrodes 37 do not have to be in contact with each other.
  • the touch sensor electrodes 36 may be arranged between the image forming layer 32 and the first transparent substrate 31 and the touch drive electrodes 37 may be arranged between the image forming layer 32 and the second transparent substrate 33 .
  • the drive electrodes (touch drive electrodes 37 or electrodes in which the touch sensor electrodes 36 and the touch drive electrodes 37 are integrated) in the touch sensing electrode portion 35 can also serve as common electrodes for controlling the image forming layer 32 .
  • the touch sensor electrode 36 (capacitance sensor) and the touch drive electrode 37, which constitute the touch sensing electrode section 35, or an electrode formed by integrating these functions as a transparent conductive layer.
  • the material of this transparent conductive layer is not particularly limited. alloys and the like.
  • the material of the transparent conductive layer may be oxides of metals such as indium, tin, zinc, gallium, antimony, zirconium and cadmium. Specific examples of this oxide include indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof.
  • the material of the transparent conductive layer may be a metal compound such as copper iodide.
  • the material of the transparent conductive layer is preferably indium oxide (ITO) containing tin oxide, tin oxide containing antimony, or the like, and particularly preferably ITO.
  • ITO indium oxide
  • the content of indium oxide in the transparent conductive layer is preferably 80 to 99% by weight and the content of tin oxide is preferably 1 to 20% by weight.
  • Electrodes constituting the touch sensing electrode portion 35 are always placed between the first transparent substrate 31 and the second transparent substrate 33. It can be formed as a transparent electrode pattern by the method. This transparent electrode pattern is electrically connected to, for example, a lead wire formed at the end of the transparent substrate. The lead-out line is connected to, for example, the controller IC.
  • the shape of the transparent electrode pattern any shape such as a comb shape, a stripe shape, a rhombus shape, or the like can be adopted according to the application.
  • the thickness of the transparent electrode pattern is, for example, 10 nm to 100 nm.
  • the width of the transparent electrode pattern is, for example, 0.1 mm to 5 mm.
  • the image display device of this embodiment includes, for example, an image display panel 11A and an illumination system.
  • the image display panels 11B and 11C of FIGS. 8 and 9 can also be used instead of the image display panel 11A.
  • the image display panel 11A is arranged, for example, on the viewing side of the lighting system.
  • the illumination system has, for example, a backlight or a reflector, and irradiates the image display panel 11A with light.
  • the image display device may be an organic EL display or a liquid crystal display. However, the image display device is not limited to this example.
  • the image display device may be an electroluminescence (EL) display, a plasma display (PD), a field emission display (FED), or the like.
  • EL electroluminescence
  • PD plasma display
  • FED field emission display
  • the image display device can be used for home appliances, vehicle applications, public information display (PID) applications, and the like, and is preferably an in-vehicle display.
  • a polyvinyl alcohol film having a thickness of 80 ⁇ m was stretched up to 3 times while being dyed in an iodine solution having a concentration of 0.3% at a temperature of 30° C. for 1 minute between rolls having different speed ratios.
  • an aqueous solution containing boric acid at a concentration of 4% and potassium iodide at a concentration of 10% at a temperature of 60° C. for 0.5 minutes the film was stretched to a total draw ratio of 6 times.
  • a polarizer with a thickness of 28 ⁇ m was obtained.
  • rice field. A 30- ⁇ m-thick transparent protective film made of a modified acrylic polymer having a lactone ring structure was attached to one side of the polarizer with a polyvinyl alcohol-based adhesive.
  • a transparent protective film with a thickness of 47 ⁇ m which is formed by forming a hard coat layer (HC) on a triacetyl cellulose film (manufactured by Konica Minolta, trade name “KC4UY”), was attached with a polyvinyl alcohol-based adhesive. combined.
  • a polarizing plate was produced by heat drying for 5 minutes in an oven set at 70°C.
  • the weight average molecular weight (Mw) of the (meth)acrylic polymer was measured by GPC (gel permeation chromatography).
  • the Mw/Mn of the (meth)acrylic polymer was also measured in the same manner.
  • Example 1 [Preparation of (meth)acrylic polymer A1] First, a monomer mixture containing 99 parts by weight of methoxyethyl acrylate and 1 part by weight of 4-hydroxybutyl acrylate was charged into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube and a condenser. Further, 0.1 part by weight of 2,2'-azobisisobutyronitrile (AIBN) as a polymerization initiator was added together with 100 parts by weight of ethyl acetate to 100 parts by weight of the monomer mixture. While gently stirring the mixture, nitrogen gas was introduced into the flask to replace it with nitrogen.
  • AIBN 2,2'-azobisisobutyronitrile
  • a solution of (meth)acrylic polymer A1 having a weight average molecular weight (Mw) of 1,800,000 and Mw/Mn of 4.4 was prepared by conducting a polymerization reaction for 8 hours while maintaining the liquid temperature in the flask at around 55°C. bottom.
  • a peroxide cross-linking agent Niper BMT manufactured by NOF Corporation
  • a silane coupling agent KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd., ⁇ -glycidoxypropylmethoxysilane
  • LiTFSI lithium bis(trifluoromethanesulfonyl)imide
  • a solution of a (meth)acrylic pressure-sensitive adhesive composition is applied to one side of a polyethylene terephthalate film (release liner: MRF38, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) treated with a silicone release agent.
  • the coating was applied to a thickness of 20 ⁇ m.
  • the obtained coating film was dried at 155° C. for 1 minute to form an adhesive sheet on the surface of the release liner.
  • the adhesive sheet formed on the release liner was transferred to the above polarizing plate to prepare the optical laminate of Example 1 (polarizing plate with adhesive sheet). The adhesive sheet was transferred to the surface of the polarizing plate on the side of the transparent protective film made of the modified acrylic polymer.
  • Example 2 In the preparation of the (meth)acrylic pressure-sensitive adhesive composition, Example 1 and An optical laminate of Example 2 was produced by the same method.
  • Example 3 In the preparation of the (meth)acrylic pressure-sensitive adhesive composition, 5 parts by weight of 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (Elexcel AS-110, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is used as a conductive agent. An optical layered body of Example 3 was produced in the same manner as in Example 1, except that the optical laminate of Example 3 was prepared.
  • 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide Elexcel AS-110, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
  • Example 4 In the preparation of the (meth)acrylic pressure-sensitive adhesive composition, 10 parts by weight of 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (Elexel AS-110, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is used as a conductive agent. An optical laminate of Example 4 was produced in the same manner as in Example 1, except that the optical layered body of Example 4 was prepared.
  • 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide Elexel AS-110, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
  • Example 5 (Meth)acrylic polymer A2 was prepared using a monomer mixture containing 69 parts by weight of butyl acrylate, 30 parts by weight of methoxyethyl acrylate and 1 part by weight of 4-hydroxybutyl acrylate in place of the (meth)acrylic polymer A1.
  • An optical laminate of Example 5 was produced in the same manner as in Example 1, except that it was prepared.
  • Example 6 (Meth)acrylic polymer using a monomer mixture containing 79 parts by weight of butyl acrylate, 20 parts by weight of methoxytriethylene glycol acrylate and 1 part by weight of 4-hydroxybutyl acrylate instead of the (meth)acrylic polymer A1.
  • An optical laminate of Example 6 was made in the same manner as in Example 1, except that A3 was prepared.
  • Example 7 Instead of the (meth)acrylic polymer A1, a monomer mixture containing 79 parts by weight of methoxyethyl acrylate, 20 parts by weight of methoxytriethylene glycol acrylate and 1 part by weight of 4-hydroxybutyl acrylate was used to form a (meth)acrylic polymer.
  • An optical laminate of Example 7 was made by the same method as Example 1, except that Polymer A4 was prepared.
  • a peroxide cross-linking agent Niper BMT manufactured by NOF Corporation
  • a silane coupling agent KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd., ⁇ -glycidoxypropylmethoxysilane
  • LiTFSI lithium bis(trifluoromethanesulfonyl)imide
  • a solution of a (meth)acrylic pressure-sensitive adhesive composition is applied to one side of a polyethylene terephthalate film (release liner: MRF38, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) treated with a silicone release agent.
  • the coating was applied to a thickness of 20 ⁇ m.
  • the obtained coating film was dried at 155° C. for 1 minute to form an adhesive sheet on the surface of the release liner.
  • the pressure-sensitive adhesive sheet formed on the release liner was transferred to the above polarizing plate to prepare an optical laminate of Comparative Example 1.
  • the adhesive sheet was transferred to the surface of the polarizing plate on the side of the transparent protective film made of the modified acrylic polymer.
  • Comparative example 2 An optical laminate of Comparative Example 2 was produced in the same manner as in Comparative Example 1, except that no conductive agent was added in the preparation of the (meth)acrylic pressure-sensitive adhesive composition.
  • the release liner was peeled off, and the surface resistance value of the pressure-sensitive adhesive sheet was measured.
  • the surface resistance value was measured using MCP-HT450 manufactured by Mitsubishi Chemical Analytic Tech under conditions of an applied voltage of 250 V and an applied time of 10 seconds.
  • the surface resistance value of the pressure-sensitive adhesive sheet was measured for the optical layered body immediately after production and the optical layered body after humidification treatment. The humidification treatment was performed according to test method 3 described above.
  • ESD test An electrostatic discharge (ESD) test was performed on the produced optical layered body by the following method. First, the release liner was peeled off from the optical layered body, and the layered body was bonded to the surface of the in-cell type liquid crystal cell on the viewing side to fabricate a liquid crystal panel with a built-in touch sensing function. Next, static electricity was applied to the viewing side (polarizing plate side) of the liquid crystal panel using an electrostatic discharge (ESD) gun whose applied voltage was adjusted to 10 kV. The time from the application of static electricity to the disappearance of the blank portion was measured and evaluated according to the following criteria. The ESD test was performed on the optical layered body immediately after production and the optical layered body after humidification treatment.
  • ESD electrostatic discharge
  • the humidification treatment was performed by the method described above for the measurement of the surface resistance value. (Evaluation criteria) A: White spots are not visually recognized. B: White spots disappear within 1 second. C: Exceeds 1 second and white spots disappear within 10 seconds. D: After exceeding 10 seconds, white spots disappear.
  • An evaluation sample having an optical layered body was prepared by the method described above, and the initial haze H 0 of the evaluation sample and the haze H of the evaluation sample after being placed in a heating environment of 105 ° C. for 250 hours. was measured.
  • the evaluation samples were produced by the following method. First, the optical laminate was cut into a size of 50 mm long ⁇ 50 mm wide, and the release liner was peeled off. The optical layered body was attached to non-alkali glass via the adhesive sheet. Next, a 250 ⁇ m thick transparent adhesive sheet (LUCIACS CS98210U manufactured by Nitto Denko Co., Ltd.) made of acrylic transparent adhesive was placed on the HC layer of the polarizing plate. An evaluation sample was prepared by bonding the optical layered body to another alkali-free glass via a transparent adhesive sheet. For the haze measurement, a haze meter (HM-150N manufactured by Murakami Color Research Laboratory) was used.
  • An evaluation sample having an optical layered body was produced by the following method, and the color was evaluated. First, the optical laminate was cut into a size of 200 mm long ⁇ 50 mm wide, and the release liner was peeled off. The optical layered body was attached to non-alkali glass via the adhesive sheet. Next, on the HC layer of the polarizing plate, a transparent adhesive sheet (LUCIACS CS98210U manufactured by Nitto Denko Co., Ltd.) having a thickness of 250 ⁇ m and made of acrylic transparent adhesive was placed. An evaluation sample was prepared by bonding the optical layered body to another alkali-free glass via a transparent adhesive sheet.
  • LUCIACS CS98210U manufactured by Nitto Denko Co., Ltd.
  • a light source (CIE standard light source D65) provided with an additional polarizing plate was prepared and placed so as to face the surface of the evaluation sample closer to the adhesive sheet than the polarizing plate.
  • the additional polarizing plate was arranged between the light source and the evaluation sample so as to form a crossed Nicols relationship with respect to the absorption axis of the polarizing plate in the optical laminate.
  • light from a light source was made incident on the surface of the evaluation sample via an additional polarizing plate. The color of the transmitted light transmitted through the evaluation sample was visually confirmed, and the results of the evaluation sample provided with the optical layered body of Comparative Example 2 containing no conductive agent were used as a reference, and the following indicators were used for evaluation. rice field.
  • evaluation of color was also performed on evaluation samples after being placed in a heating environment of 105° C. for 250 hours.
  • the evaluation sample including the optical layered body of Comparative Example 2 no unnecessary coloring was observed in the transmitted light before and after being placed in the heating environment.
  • LiTFSI lithium bis(trifluoromethanesulfonyl)imide
  • AS-110 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide
  • the optical laminates of Examples contained adhesive sheets with sufficiently low surface resistance values, and had good color evaluation results even when subjected to a high-temperature environment. From the results in Table 2, it is estimated that the optical laminates of Examples are suitable for suppressing unnecessary coloring of light emitted from an image display device even when subjected to a high-temperature environment. .
  • the optical layered body of Comparative Example 1 exhibited green coloration in the transmitted light in the color evaluation after passing through a high-temperature environment.
  • the surface resistance value of the pressure-sensitive adhesive sheet was not sufficient, and the results of the ESD test were inferior to those of Examples.
  • optical laminate of the present invention can be suitably used for image display devices such as EL displays and liquid crystal displays.

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  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne un corps multicouche optique qui comprend une feuille adhésive ayant une résistance de surface suffisamment faible, et qui est approprié pour supprimer une coloration indésirable de la lumière provenant d'un dispositif d'affichage d'image même dans les cas où le corps multicouche optique a été dans un environnement à haute température. Un corps multicouche optique 10A selon la présente invention comprend : une feuille adhésive 1 qui est formée à partir d'une composition adhésive contenant un polymère (A) ; et une plaque polarisante 2. Le polymère (A) a une constante diélectrique relative de 5,0 ou plus à une fréquence de 100 kHz. La feuille adhésive 1 a une résistance de surface égale ou inférieure à 1,0 × 1010 Ω/□. Le trouble tel que mesuré par le procédé de test décrit ci-dessous est inférieur ou égal à 1,0 %.　Procédé de test : Un échantillon pour évaluation est formé en prenant en sandwich le corps multicouche optique 10A entre deux feuilles de verre sans alcali. Le trouble de l'échantillon à évaluer est mesuré après chauffage de l'échantillon pour une évaluation à 105 °C pendant 250 heures.
PCT/JP2022/039783 2021-11-15 2022-10-25 Corps multicouche optique, écran d'affichage d'image et dispositif d'affichage d'image WO2023085083A1 (fr)

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JP2020098320A (ja) * 2018-12-17 2020-06-25 日東電工株式会社 ベゼル付き画像表示パネル、画像表示装置および粘着剤層付き光学フィルム
WO2020175088A1 (fr) * 2019-02-27 2020-09-03 住友化学株式会社 Stratifié, composition adhésive et feuille adhésive
WO2021085136A1 (fr) * 2019-10-28 2021-05-06 綜研化学株式会社 Composition d'agent adhésif, feuille adhésive et élément optique

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