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WO2017095171A1 - Plaque polarisante complexe et dispositif d'affichage d'image comprenant celle-ci - Google Patents

Plaque polarisante complexe et dispositif d'affichage d'image comprenant celle-ci Download PDF

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Publication number
WO2017095171A1
WO2017095171A1 PCT/KR2016/014084 KR2016014084W WO2017095171A1 WO 2017095171 A1 WO2017095171 A1 WO 2017095171A1 KR 2016014084 W KR2016014084 W KR 2016014084W WO 2017095171 A1 WO2017095171 A1 WO 2017095171A1
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Prior art keywords
polarizing plate
weight
coating layer
parts
acrylate
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English (en)
Korean (ko)
Inventor
정병선
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Dongwoo Fine Chem Co Ltd
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Dongwoo Fine Chem Co Ltd
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Publication of WO2017095171A1 publication Critical patent/WO2017095171A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the present invention relates to a composite polarizing plate and an image display device including the same, and more particularly, to a composite polarizing plate having a thin film-weighted structure and excellent adhesion and optical reliability, and an image display device including the same.
  • Republic of Korea Patent Publication No. 2008-0073252 is a liquid crystal cell; A first polarizing plate attached to one side of the liquid crystal cell and including a first polarizer and a first protective film; A second polarizing plate attached to the other side of the liquid crystal cell and including a second polarizer and a second protective film; And an adhesive for attaching the liquid crystal cell and the first polarizer or the second polarizer, wherein the first protective film is attached to an upper portion of the first polarizer of the first polarizing plate, and an adhesive is attached to the liquid crystal cell side.
  • a flexible liquid crystal display is disclosed.
  • the flexible liquid crystal display is intended to achieve a thin structure by removing the protective film in contact with the liquid crystal cell of the polarizing plate, but more structurally required to achieve a thin film weight of the polarizing plate.
  • the present invention is to solve the above problems, one object of the present invention is to provide a composite polarizing plate excellent in adhesiveness and optical reliability while having a thin-film lightweight structure.
  • Another object of the present invention is to provide an image display device including the composite polarizing plate.
  • the present invention A polarizing coating layer formed on one surface of the substrate; A photocurable adhesive layer formed on the polarizing coating layer; And a phase difference coating layer formed on the photocurable adhesive layer, the composite polarizing plate having an absorbance of 0.5 to 1.5 at a wavelength of 400 nm of the photocurable adhesive layer.
  • the photocurable adhesive layer may be formed from an adhesive composition comprising an acrylic monomer and a long wavelength photopolymerization initiator.
  • the absorption wavelength region of the long wavelength photopolymerization initiator may be in the range of 350 to 450 nm.
  • the long wavelength photopolymerization initiator may include a compound of Formula 1:
  • R 1 is hydrogen or an alkyl group of C 1 -C 10 ,
  • R 2 is hydrogen or an alkyl group of C 1 -C 10 ,
  • n 1 to 4
  • n is an integer of 0-2.
  • the long wavelength photopolymerization initiator may be included in 0.5 to 10 parts by weight based on 100 parts by weight of the acrylic monomer.
  • the present invention provides an image display device including the composite polarizing plate.
  • the composite polarizing plate according to the present invention has a thin film-weighted structure, and has a photocurable adhesive layer having an absorbance of 0.5 or more at 400 nm wavelength, thereby securing excellent adhesion and optical reliability between UV-blocking coating layers.
  • FIG. 1 is a cross-sectional view schematically showing a composite polarizing plate according to an embodiment of the present invention.
  • a composite polarizing plate 100 includes a substrate 110; A polarizing coating layer 120 formed on one surface of the substrate; A photocurable adhesive layer 130 formed on the polarizing coating layer; And a phase difference coating layer 140 formed on the photocurable adhesive layer.
  • the composite polarizing plate 100 is a laminate having a complex structure of a polarizing coating layer 120 and a retardation coating layer 140 having UV blocking properties, and may implement a thin film-weighted display device.
  • the interlayer peel force and optical reliability of 0.5 N / 25 mm or more can be ensured by providing the photocurable adhesive layer 130 whose light absorbency in 400 nm wavelength is 0.5 or more, especially 0.5-1.5 in between.
  • the absorbance (A / ⁇ 400) at the 400 nm wavelength is a value that can be measured with a spectrophotometer or the like and is obtained by measuring the transmitted light intensity when light having a wavelength of 400 nm is incident on a sample (photocurable adhesive layer) as incident light.
  • Composite polarizing plate according to an embodiment of the present invention may have a thickness of 10 to 100 ⁇ m, preferably 10 to 60 ⁇ m.
  • the polarizing coating layer serves as an optical film, ie, a polarizer, which serves to convert incident natural light into a desired single polarization state (linear polarization state), and may be formed on at least one surface of the substrate. .
  • the alignment film forming composition may be applied onto a substrate to impart orientation to form an alignment film layer, and the coating layer forming composition containing a liquid crystal compound and a dichroic dye may be coated on the alignment film layer to form a liquid crystal coating layer.
  • the coating layer forming composition containing a liquid crystal compound and a dichroic dye may be coated on the alignment film layer to form a liquid crystal coating layer.
  • Such a polarizing coating layer may be formed in a thinner thickness than a conventional polarizing plate, that is, a polyvinyl alcohol-based polarizer and a polarizing plate including a protective film attached to both surfaces of the polarizer through an adhesive.
  • the substrate may be a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy and the like.
  • polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Polyether ether ketone resins; Sulf
  • the alignment layer forming composition may include an alignment agent, a photopolymerization initiator, and a solvent commonly used in the art.
  • an alignment agent conventionally used in the art may be used without particular limitation.
  • a polyacrylate-based polymer, a polyamic acid, a polyimide-based polymer, or a polymer containing cinnamate groups may be used as the alignment agent, and in the case of applying photoalignment, it is preferable to use a polymer containing cinnamate groups.
  • the polymer used as the alignment agent may have a weight average molecular weight of about 10,000-500,000, but is not limited thereto.
  • a photopolymerization initiator As the photopolymerization initiator, a photopolymerization initiator commonly used in the art may be used without particular limitation.
  • a benzoin compound, a benzophenone compound, an alkylphenone compound, an acylphosphine oxide compound, a triazine compound, an iodonium salt, and a sulfonium salt are mentioned.
  • a commercial item can also be used as a photoinitiator.
  • Alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, propylene glycol monomethyl ether, and a phenol
  • Ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, ⁇ -butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate
  • Ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone
  • Aliphatic hydrocarbon solvents such as pentane, hexane and heptane
  • Nitrile solvents such as aromatic hydrocarbon solvents, such as toluene and
  • the alignment layer forming composition may further include additives such as fillers, curing agents, leveling agents, adhesion promoters, antioxidants, ultraviolet absorbers, anti-agglomerating agents, chain transfer agents, and the like, as necessary.
  • a commercial item may be used for the said oriented film formation composition, As the specific example, ROP-108 EXP115 marketed by Rolic company is mentioned.
  • alignment layer forming composition may be used without limitation, for example, conventional coating methods known in the art, such as a doctor blade, a wire bar, a die coater, a comma coater, a gravure coater, a roll.
  • drying may be performed at 120 ° C. or less, preferably 30 to 120 ° C., more preferably 50 to 120 ° C., but is not limited thereto.
  • the orientation treatment can adopt various methods known in the art without limitation, and preferably photocuring can be used.
  • the coating layer forming composition may include a liquid crystal compound and a dichroic dye having optical anisotropy and crosslinking by light or heat.
  • the liquid crystal compound may include, for example, a reactive liquid crystal compound (RM).
  • a reactive liquid crystal compound examples include those described in Information Display 10, No. 1 (Recent Research Trends of Reactive Liquid Crystal Monomer (RM)).
  • the reactive liquid crystal compound refers to a monomer molecule having a liquid crystal phase, including a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization.
  • a monomer molecule having a liquid crystal phase including a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization.
  • the large area liquid crystal crosslinked network film thus formed is mechanically and thermally stable because it has a solid thin film form while maintaining properties such as optical anisotropy and dielectric constant of the liquid crystal.
  • a commercial item may be used as the reactive liquid crystal compound, and specific examples thereof include pario color LC242 sold by BASF. These reactive liquid crystal compounds may be used alone or in combination of a plurality thereof.
  • the dichroic dye refers to a dye that absorbs light of one of two polarization orthogonal components and transmits another polarization orthogonal component with respect to the determined wavelength region.
  • the dichroic dye has a property of linearly polarizing light.
  • dichroic dyes anthraquinone dyes, phthalocyanine dyes, propyrine azo dyes, viazo dyes, and triazo dyes may be used.
  • dichroic azo dyes are suitable.
  • the dichroic dye polymerizes the reactive liquid crystal compound
  • the dichroic dye is dispersed between the liquid crystals and aligned in the same direction as the liquid crystals.
  • the coating layer forming composition is used after dilution in a solvent in order to ensure the efficiency of the coating process and uniformity of the coating layer, and preferably has a uniform dissolved in a solvent capable of dissolving the liquid crystal compound.
  • the reactive liquid crystal compound comprises an initiator for polymerizing and crosslinking it to prepare a coating layer forming composition.
  • the initiator may be a known photopolymerization initiator or a thermal polymerization initiator, and the photopolymerization initiator is preferable because of easy reaction time and control.
  • the initiator may be used in an amount of 10 wt% or less, preferably 0.1 to 5 wt%, based on the total solids of the reactive liquid crystal compound.
  • the reactive liquid crystal compound may further include an additive to prepare a coating layer forming composition.
  • Additives include, for example, photosensitizers, dispersants, binders (eg, free radical polymerizable and cationic polymerizable binders), preservatives (eg, glutaraldehyde, tetramethylolacetyleneurea), silane coupling agents, leveling agents, Crosslinking agents, antioxidants, degassing agents, defoamers, viscosity modifiers, flow improvers, sedimentation inhibitors, gloss improvers, lubricants, adhesion promoters, meting agents, emulsifiers, stabilizers, hydrophobic agents, ultraviolet absorbers, treatment improvers, antistatic agents and the like can be used. .
  • the content of the ultraviolet absorbent may be appropriately selected within a range that does not impair the function of the polarizing coating layer.
  • the method of applying the coating layer forming composition is not particularly limited, and specifically, die coating, pin coating, roll coating, dispensing coating, gravure coating, or the like may be used. It is desirable to determine the type and amount of solvent depending on the coating method.
  • the solvent contained in the coating layer forming composition is evaporated through a drying process.
  • the drying is not particularly limited, and can be generally performed using a hot air dryer or a far infrared heater, and the drying temperature is usually 50 to 150 ° C, preferably 70 to 130 ° C, and the drying time is usually 30 to 600 seconds, preferably Is 60 to 300 seconds. In addition, drying may be carried out at the same temperature conditions, or may be performed while raising the temperature step by step.
  • photocuring is carried out by light irradiation such as ultraviolet rays or thermosetting by heat irradiation such as a heater to form a liquid crystal coating layer.
  • the photocuring may be used for low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, chemical lamp, black light lamp, microwave excitation mercury lamp, metal halide lamp, etc. Use of halide lamps is preferred.
  • Roughness may range from 30 to 300 mW / cm 2, preferably from 30 to 250 mW / cm 2, more preferably from 30 to 200 mW / cm 2. If the roughness is less than 30mW / cm2 the curing time is long, the productivity may be lowered, if it is more than 300mW / cm2 it can be deformed by applying heat damage to the film due to high roughness.
  • 0.5-10 micrometers is preferable and, as for the thickness of the said polarizing coating layer, 0.5-5 micrometers is more preferable.
  • the retardation coating layer plays a role of eliminating image coloring, enlarging the viewing angle, color correction, reducing light reflection, and the like.
  • the retardation coating layer is applied to the alignment film forming composition on the transfer film and imparting orientation to form an alignment film layer, by coating a coating layer forming composition containing a liquid crystal compound on the alignment film layer to form a liquid crystal coating layer, and then the adhesive layer and It may be formed by attaching and then removing the transfer film, but is not limited thereto.
  • the transfer film may be a polymer film exemplified as the substrate of the polarizing coating layer described above.
  • the alignment film forming composition Since the alignment film forming composition, its coating, drying method, and the like are the same as described in the polarizing coating layer, the description is omitted to avoid duplication.
  • composition of the coating layer forming composition is the same as described in the polarizing coating layer, except that the dichroic dye is not included.
  • coating, drying and curing methods of the coating layer forming composition are the same as those described in the polarizing coating layer, the description is omitted to avoid duplication.
  • 0.5-10 micrometers is preferable and, as for the thickness of the said retardation coating layer, 0.5-5 micrometers is more preferable.
  • the photocurable adhesive layer is interposed between the UV blocking polarizing coating layer and the UV blocking retardation coating layer, and serves to attach them to each other.
  • the photocurable adhesive layer may be formed by applying and curing an adhesive composition including an acrylic monomer and a long wavelength photopolymerization initiator on a polarizing coating layer or a retardation coating layer, having an absorbance at 400 nm wavelength of 0.5 or more, particularly 0.5 to 1.5.
  • the acrylic monomer is a (meth) acrylic compound having at least one (meth) acryloyloxy group in a molecule, and specifically, methyl (meth) acrylate, allyl methacrylate, 2-ethoxyethyl (meth) acrylate, Isodecyl (meth) acrylate, 2-dodecylthioethyl methacrylate, octyl acrylate, 2-methoxyethyl acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylic Latex, 4-hydroxybutyl (meth) acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, stearyl (meth) acrylate, glycidyl (meth) acrylate, tetraperfuryl ( Monofunctional, such as meth) acrylate, phenoxyethyl (meth)
  • the long wavelength photopolymerization initiator included in the adhesive composition refers to an initiator that absorbs long-wavelength active energy rays to generate radicals, and the absorption wavelength range may be, for example, in the range of 350 to 450 nm.
  • Such a long wavelength photopolymerization initiator can prevent the photocuring of a photopolymerizable compound such as an acrylic monomer from being inhibited due to a filter effect even when used for attachment of a UV blocking polarizing coating layer and a retardation coating layer to block ultraviolet rays of 370 nm or less. .
  • the long wavelength photopolymerization initiator may include a compound of Formula 1:
  • R 1 is hydrogen or an alkyl group of C 1 -C 10 , preferably methyl,
  • R 2 is hydrogen or an alkyl group of C 1 -C 10 , preferably methyl, ethyl or isopropyl,
  • n 1 to 4
  • n is an integer of 0-2.
  • an alkyl group of C 1 -C 10 refers to a straight or branched hydrocarbon having 1 to 10 carbon atoms, for example methyl, ethyl, n-propyl, i-propyl, n-butyl, i -Butyl, t-butyl, n-pentyl, n-hexyl, and the like.
  • Representative examples of the compound of Formula 1 include bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide, bis (2,4,6 -Trimethylbenzoyl) -4-methylphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -2,5-diisopropylphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -2- Methylphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -2,5-diethylphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -2,3,5,6-tetramethylphenyl Phosphine oxide and mixtures thereof.
  • the long wavelength photopolymerization initiator may be included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of a photopolymerizable compound such as the acrylic monomer.
  • a photopolymerizable compound such as the acrylic monomer.
  • the long wavelength photopolymerization initiator may be used alone or in combination with a short wavelength photopolymerization initiator having an absorption wavelength range of 370 nm or less.
  • the short wavelength photopolymerization initiator examples include benzoin compounds, benzophenone compounds, thioxanthone compounds, triazine compounds and the like.
  • the adhesive composition may further include additives known in the art as needed.
  • the kind of the additive is not particularly limited, and for example, a photosensitizer, a silane coupling agent, an adhesion promoter, a leveling agent, an ultraviolet absorber, an antioxidant, a dye, a processing aid, an ion trap, an antioxidant, a tackifier, a filler , Plasticizers, foaming inhibitors, antistatic agents, fragrances, surfactants and the like. These can be used individually or in mixture of 2 or more types.
  • the adhesive composition is cured by irradiating active energy rays to attach the UV blocking polarizing coating layer and the UV blocking retardation coating layer.
  • the light source of the active energy ray low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, chemical lamp, black light lamp, microwave excitation mercury lamp, metal halide lamp and the like can be used.
  • strength with respect to an adhesive agent is suitably determined according to the composition of the adhesive agent, although it does not specifically limit, It is preferable that the irradiation intensity of the wavelength range effective for activation of a polymerization initiator is 0.1-6000 mW / cm ⁇ 2>.
  • the reaction time does not become too long, and when 6000 mW / cm 2 or less, there is little possibility that yellowing or deterioration due to heat radiated from the light source and exotherm upon curing of the adhesive is less likely to occur.
  • the light irradiation time with respect to an adhesive agent is controlled for every adhesive agent to harden
  • the active species derived from the polymerization initiator may be generated in a sufficient amount to cure the reaction more reliably.
  • the irradiation time is not too long, so that the good productivity is achieved. Can be maintained.
  • the thickness of the photocurable adhesive layer may be adjusted according to its adhesive strength, preferably 0.1 to 10 ⁇ m, more preferably 0.1 to 5 ⁇ m.
  • the composite polarizing plate according to the embodiment of the present invention as described above has a thin film-weighted structure having a thickness of 10 to 100 ⁇ m, preferably 10 to 60 ⁇ m, and has excellent adhesion, as can be seen in the experimental example described later. Therefore, when the peeling force evaluation can exhibit an interlaminar peeling force of 0.5 N / 25mm or more, it is also excellent in optical reliability.
  • the composite polarizing plate according to the present invention can be applied to various image display devices such as electroluminescent display devices and plasma display devices as well as ordinary liquid crystal display devices. Accordingly, another embodiment of the present invention relates to an image display device including the composite polarizing plate.
  • a polymerizable liquid crystal compound 100 parts by weight of a compound represented by the following formula, 2 parts by weight of an azo dye (NKX2029; Hayashibara Seibutsu Chemical Co., Ltd.), 2-dimethylamino-2-benzyl-1- (4-morpholino) as a polymerization initiator 6 parts by weight of phenyl) butan-1-one (Igacure 369; BASF Japan Co., Ltd.), 2 parts by weight of isopropyl thioxanthone (Nihon Seibel Heg Screw) as a photosensitizer, and a polyacrylate compound (BYK-361N) as a leveling agent; BYK-Chemical Co.) 1.2 parts by weight and 250 parts by weight of cyclopentanone were mixed with a solvent, and the obtained mixture was stirred at 80 ° C. for 1 hour to prepare a composition for forming a polarizing coating layer.
  • a compound represented by the following chemical formula as a polymerizable liquid crystal compound 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one (Igacure 369; BASF Japan) 6 Parts by weight, 2 parts by weight of isopropyl thioxanthone (Nihon Siebel Heg Screw) as a photosensitizer, 1.2 parts by weight of a polyacrylate compound (BYK-361N; BYK-Kemissa) as a leveling agent, 2- (2- as a UV absorber 2 parts by weight of hydroxyphenyl-benzotriazole) (Tinuvin® 99-2; BASF) and 250 parts by weight of cyclopentanone with a solvent, and the resulting mixture was stirred at 80 ° C. for 1 hour to form a phase difference coating layer.
  • the composition was prepared.
  • A-1 isobornyl acrylate
  • A-2 4-hydroxybutyl acrylate
  • A-3 20 parts by weight of Shinnakamura
  • 10 parts by weight of trimethylolpropane triacrylate A-4 , Shinnakamura
  • diphenyl- (2,4,6-trimethylbenzoyl) phosphine as a photopolymerization initiator.
  • An adhesive composition was prepared by mixing 3 parts by weight of oxide (TPO) ( C-1 , 340 to 440 nm, BASF).
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • BASF phosphine oxide
  • An adhesive composition was prepared in the same manner as in Preparation Example 3-1, except that 0.5 parts by weight of phenylphosphine oxide ( C-2 , Igacure - 819, 320 to 440 nm, Ciba) was used.
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • BASF phosphine oxide
  • An adhesive composition was prepared in the same manner as in Preparation Example 3-1, except that 1.5 parts by weight of phenylphosphine oxide ( C-2 , Igacure - 819, 320 to 440 nm, Ciba) was used.
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • BASF diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • C-3 1-hydroxycyclohexyl phenyl ketone
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • BASF diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • C-3 1-hydroxycyclohexyl phenyl ketone
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • BASF diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • C-3 1-hydroxycyclohexyl phenyl ketone
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • An adhesive composition was prepared by mixing 1 part by weight of oxycyclohexyl phenyl ketone ( C-3 , Igacure - 184, 240 to 370 nm, Ciba).
  • An adhesive composition was prepared by mixing 3 parts by weight of oxide ( C-2 , Igacure - 819, 320 to 440 nm, Ciba).
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • TPO diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide
  • ROP-108 EXP115 (Rolic Co., Ltd.) was applied on a 25- ⁇ m-thick triacetyl cellulose-based film to a thickness of 1 ⁇ m and then exposed to light (250 mJ / cm 2 ) to form an alignment layer. Thereafter, the composition for forming a polarizing coating layer of Preparation Example 1 was applied and dried, and cured by UV irradiation at 40 mW / cm 2 for 1 minute to form a polarizing coating layer having a thickness of 4.5 ⁇ m.
  • ROP-108 EXP115 (Rolic Co., Ltd.) was applied on a PET transfer film having a thickness of 40 ⁇ m to a thickness of 1 ⁇ m, and exposed to light (250 mJ / cm 2 ) to form an alignment layer. Then, the composition for forming a phase difference coating layer of Preparation Example 2 was applied by a die coating method, dried, and cured by UV irradiation at 40 mW / cm 2 for 1 minute to form a phase difference coating layer having a thickness of 4 ⁇ m.
  • the adhesive composition of Preparation Example 3-1 was applied on the polarizing coating layer, the retardation coating layer and the transfer film were laminated on the applied adhesive composition, and then irradiated with UV to form an adhesive layer having a thickness of 1 ⁇ m. Thereafter, the transfer film was peeled off to prepare a composite polarizing plate.
  • the adhesive compositions prepared in Production Examples 3-1 to 3-15 and Comparative Production Example 3-1 were each applied onto a 50 ⁇ m thick TAC film, and UV was irradiated to form an adhesive layer having a thickness of 1 ⁇ m.
  • the absorbance of the adhesive layer was measured at 400 nm using a UV spectrophotometer (UV2450, manufactured by Shimadzu Corporation), and the results are shown in Table 1 below.
  • the bonding was performed by using a hand roller on a soda glass using a pressure-sensitive adhesive, and then bonded by an autoclave treatment at a pressure of 2 atm, a temperature of 50 ° C., and a time of 20 minutes. Bubbles generated at the time were removed.
  • the polarizing plates prepared in Examples and Comparative Examples were cut to A4 size, and then bonded to glass with an acrylic adhesive to prepare a specimen.
  • the samples were evaluated based on the initial polarization degree of the polarizing plate and the change rate relative to the front luminance.
  • ⁇ rate of change of ⁇ 10% or more relative to the initial polarization degree and the front luminance
  • the composite polarizing plates of Examples 1 to 15 according to the present invention are provided with an adhesive layer having an absorbance of 0.5 or more at 400 nm and higher than that of the composite polarizing plate of Comparative Example 1 having an absorbance at 400 nm. Not only the adhesion but also the optical reliability was excellent.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polarising Elements (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne une plaque polarisante complexe comprenant : un substrat; une couche de revêtement polarisant formée sur une surface du substrat; une couche d'adhésif photodurcissable formée sur la couche de revêtement polarisant; et une couche de revêtement de déphasage formée sur la couche d'adhésif photodurcissable, dans laquelle l'absorbance à une longueur d'onde de 400 nm de la couche d'adhésif photodurcissable est de 0,5 à 1,5. La plaque polarisante complexe selon la présente invention peut assurer d'excellentes adhérence et fiabilité optique entre des couches de revêtement respectives tout en ayant une structure de couche mince légère.
PCT/KR2016/014084 2015-12-02 2016-12-02 Plaque polarisante complexe et dispositif d'affichage d'image comprenant celle-ci Ceased WO2017095171A1 (fr)

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EP3418782B1 (fr) * 2016-12-26 2023-05-03 LG Chem, Ltd. Film de protection de polariseur, plaque de polarisation le comprenant, appareil d'affichage à cristaux liquides comprenant une plaque de polarisation, et composition de revêtement pour film de protection de polariseur

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JP6800359B2 (ja) * 2019-03-05 2020-12-16 住友化学株式会社 積層体

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KR20130135671A (ko) * 2012-06-01 2013-12-11 주식회사 엘지화학 자외선 차단 기능이 우수한 광학 필름 및 이를 포함하는 편광판
KR20150085647A (ko) * 2014-01-16 2015-07-24 동우 화인켐 주식회사 광경화성 접착제 조성물 및 이를 포함하는 편광판
KR20150093313A (ko) * 2014-02-07 2015-08-18 스미또모 가가꾸 가부시키가이샤 접착제 조성물 및 이를 이용한 복합 편광판
KR20150102625A (ko) * 2014-02-28 2015-09-07 제일모직주식회사 편광판용 점착제 조성물, 이로부터 형성된 점착층을 포함하는 편광판 및 이를 포함하는 광학표시장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3418782B1 (fr) * 2016-12-26 2023-05-03 LG Chem, Ltd. Film de protection de polariseur, plaque de polarisation le comprenant, appareil d'affichage à cristaux liquides comprenant une plaque de polarisation, et composition de revêtement pour film de protection de polariseur

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