WO2019112000A1 - Procédé de découpe et procédé de fabrication d'un film stratifié - Google Patents

Procédé de découpe et procédé de fabrication d'un film stratifié Download PDF

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Publication number
WO2019112000A1
WO2019112000A1 PCT/JP2018/044899 JP2018044899W WO2019112000A1 WO 2019112000 A1 WO2019112000 A1 WO 2019112000A1 JP 2018044899 W JP2018044899 W JP 2018044899W WO 2019112000 A1 WO2019112000 A1 WO 2019112000A1
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Prior art keywords
layer
laser
cutting
laser beam
film
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PCT/JP2018/044899
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English (en)
Japanese (ja)
Inventor
力也 松本
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住友化学株式会社
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Priority claimed from JP2018208864A external-priority patent/JP7260993B2/ja
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020207015578A priority Critical patent/KR102657288B1/ko
Priority to CN201880077112.3A priority patent/CN111432979A/zh
Publication of WO2019112000A1 publication Critical patent/WO2019112000A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting

Definitions

  • the present invention relates to a cutting method and manufacturing method of a laminated film in which a plurality of resin layers of different materials are laminated.
  • Priority is claimed on Japanese Patent Application No. 2017-235351, filed Dec. 7, 2017, and Japanese Patent Application No. 2018-208864, filed on Nov. 6, 2018, the contents of which are incorporated herein by reference. Is incorporated herein by reference.
  • an optical film such as a polarizing plate or a retardation film (retardation plate) is attached to an optical display panel such as a liquid crystal panel or an organic EL panel.
  • an optical display panel such as a liquid crystal panel or an organic EL panel.
  • a film obtained by unrolling a long film from a film roll and cutting (rolling out) the unrolled film into a width and a length corresponding to an optical display panel is used. .
  • a cutter is conventionally used for the cutting process of the optical film.
  • foreign substances such as film scraps are easily generated at the time of cutting.
  • a display defect etc. may be generated on an optical display panel.
  • Patent Document 1 in the cutting of a laminate including a resin film and one or more functional layers, a first cutting step of cutting a part of the functional layer and the resin film with a laser, and a cutting blade And a second cutting step of cutting the remaining resin film.
  • Patent Document 2 discloses a manufacturing method of a polarizing plate in which a polarizing plate is cut off a layer constituting another polarizing plate while leaving only a peeling film, and the surface protection film layer is formed of a laser light low absorptivity film. There is disclosed a method of cutting with a laser up to the layer immediately before the layer, and then cutting with a cutter the layer consisting of a low laser absorption film.
  • Patent Document 3 discloses a groove forming step of cutting a high absorptivity film by laser light irradiation and forming a groove in the low absorptivity film and a tearing step of tearing the low absorptivity film along the groove A method of cutting a polarizing plate is disclosed.
  • Japanese Patent No. 5359356 gazette Japanese Patent No. 4743339 Japanese Patent No. 5481300
  • a typical polarizing plate is, for example, polyvinyl alcohol (polarizer) between a triacetylcellulose (TAC) layer to be an upper protective layer and a cycloolefin polymer (COP) layer to be a lower protective layer.
  • polarizer polyvinyl alcohol
  • TAC triacetylcellulose
  • COP cycloolefin polymer
  • the layer comprises the laminated
  • the layer other than the COP layer is a layer which is relatively easy to be cut (a layer having a high laser beam absorptivity). It is cut by photodecomposition processing with few occurrence of and cross section quality is kept good.
  • the COP layer is a layer which is relatively difficult to cut (a layer having a low absorptivity of laser light)
  • the COP layer is cut by thermal processing due to the vibration of molecules, and the cross-sectional quality is deteriorated.
  • the aspect of the present invention has been proposed in view of such conventional circumstances, and can accurately cut a laminated film in which a plurality of resin layers of different materials such as a polarizing plate are laminated, and It is an object of the present invention to provide a method for cutting a laminated film capable of maintaining good cross-sectional quality of a cut laminated film, and a method for producing a laminated film using such a method for cutting a laminated film.
  • a method of cutting a laminated film in which a laminated film in which a plurality of resin layers of different materials are laminated is cut along a cutting line By scanning a cutting line of the film with a plurality of laser beams having different wavelengths, a method for cutting a laminated film is provided, in which the plurality of resin layers are cut.
  • the plurality of resin layers are scanned by scanning a cutting line of the laminated film with a first laser beam and a second laser beam having a wavelength different from that of the first laser beam.
  • the resin layer exhibiting a photolytic reaction due to the absorption of the first laser beam is cut by the first laser beam, and the photolytic reaction is caused by the absorption of the second laser beam among the plurality of resin layers. May be cut by the second laser beam.
  • the first laser beam is a laser beam excited by a carbon dioxide gas laser
  • the second laser beam is a laser beam excited by a YAG laser, an excimer laser or a semiconductor laser.
  • a method of producing a laminated film in which a plurality of resin layers of different materials are laminated comprising: a cutting step of cutting the plurality of resin layers along a cutting line, In the process, a method of producing a laminated film using any of the above-mentioned cutting methods is provided.
  • the laminated film is a polarizing plate in which at least a cycloolefin polymer (COP) layer and a polyvinyl alcohol (PVA) layer are laminated, and the PVA layer is subjected to the first laser light. Cutting may be performed, and the COP layer may be cut by the second laser beam.
  • COP cycloolefin polymer
  • PVA polyvinyl alcohol
  • the laminated film is a polarizing plate further including a triacetylcellulose (TAC) layer, and the COP layer, the PVA layer, and the TAC layer are laminated in this order,
  • TAC triacetylcellulose
  • the TAC layer and the PVA layer may be cut by the first laser beam, and the COP layer may be cut by the second laser beam.
  • the second laser beam may be a laser beam excited by a YAG laser, an excimer laser or a semiconductor laser.
  • the laminated film may be a laminated film for a flexible image display device including at least two or more selected from a circularly polarizing plate, a window film, and a touch sensor.
  • a laminated film in which a plurality of resin layers having different materials are laminated is cut by photolysis processing with little heat generation using laser beams of different wavelengths.
  • a plurality of resin layers constituting the laminated film can be cut with high precision, and the cross-sectional quality of the cut laminated film can be kept good.
  • Method of cutting laminated film In the method of cutting a laminated film to which the present invention is applied, when cutting a laminated film in which a plurality of resin layers of different materials are laminated along a cutting line, the cutting line of the laminated film is subjected to a plurality of laser beams of different wavelengths. A plurality of resin layers are cut by scanning.
  • the uppermost layer of the polarizing plate FX is protected by surface protection film S2.
  • the surface protective film S2 is made into a sheet piece of a predetermined size together with the polarizing plate FX in the cutting process, and after being bonded to the liquid crystal panel, it is peeled off from the polarizing plate FX.
  • a polyethylene terephthalate (PET) film can be used as such surface protection film S2.
  • the polarizing plate FX has a laminated structure in which a polarizer layer S5 (resin layer) is sandwiched between a pair of protective layers S3 and S4 (resin layers).
  • the polarizing plate FX according to this embodiment includes a cycloolefin polymer (COP) layer as the lower protective layer S3, a polyvinyl alcohol (PVA) layer as the polarizer layer S5, and a trilayer as the upper protective layer S4.
  • An acetyl cellulose (TAC) layer constitutes a laminated film laminated in this order.
  • the laminated structure of the polarizing plate FX shown in FIG. 1 is merely an example, and is not necessarily limited to such a laminated structure, and is a laminated film in which a plurality of resin layers (films) of different materials are laminated. It is possible to change the material, thickness, etc. used for each resin layer (film) suitably, and to carry out.
  • the method for producing a laminated film to which the present invention is applied can be suitably used when producing a laminated film (laminated film for flexible image display device) applied to a flexible image display device.
  • the flexible image display device comprises a laminated film for a flexible image display device and an organic EL display panel, and a laminate for a flexible image display device is disposed on the viewing side with respect to the organic EL display panel and is configured to be bendable. There is.
  • a laminate for a flexible image display device at least two or more selected from a window film (hereinafter sometimes abbreviated as “window”), a circularly polarizing plate, and a touch sensor may be used. Just do it.
  • a window film hereinafter sometimes abbreviated as “window”
  • a circularly polarizing plate As a laminate for a flexible image display device, at least two or more selected from a window film (hereinafter sometimes abbreviated as “window”), a circularly polarizing plate, and a touch sensor may be used. Just do it.
  • a window film hereinafter sometimes abbreviated as “window”
  • a circularly polarizing plate a touch sensor
  • the lamination order of the window, the circularly polarizing plate and the touch sensor is arbitrary, the configuration in which the window, the circularly polarizing plate and the touch sensor are laminated in order from the viewing side, or It is preferable to laminate in the order of the polarizing plates. If a circularly polarizing plate is present on the viewing side of the touch sensor, the pattern of the touch sensor is less likely to be viewed, and the visibility of the display image is preferably improved.
  • the window, the circularly polarizing plate, and the touch sensor can be stacked by bonding using an adhesive, a pressure-sensitive adhesive, or the like.
  • a light shielding pattern can be formed on at least one surface of any of the window, the circularly polarizing plate, and the touch sensor.
  • the window is disposed on the viewing side of the flexible image display device, and plays a role as a protective layer that protects other components from environmental changes such as external impact or temperature and humidity.
  • a protective layer that protects other components from environmental changes such as external impact or temperature and humidity.
  • glass has been used as such a protective layer, but the window in the flexible image display device is not as rigid and rigid as glass, but is made of the transparent substrate having the above-mentioned flexibility.
  • the transparent substrate may include a hard coat layer on at least one side.
  • the transparency of the transparent substrate used for the window is preferably such that the transmittance of visible light is 70% or more, and more preferably 80% or more.
  • the transparent substrate is not particularly limited as long as it is a transparent polymer film, and any material can be used.
  • polyolefins such as polyethylene, polypropylene, polymethylpentene, cycloolefin derivatives having units of monomers including norbornene or cycloolefin; (modified) celluloses such as diacetyl cellulose, triacetyl cellulose, propionyl cellulose Acrylics such as methyl methacrylate (co) polymer; polystyrenes such as styrene (co) polymer; acrylonitrile butadiene styrene copolymers acrylonitrile acrylonitrile styrene copolymers ethylene-vinyl acetate copolymer ; Halogen-containing polymers such as polyvinyl chlorides and polyvinylidene chlorides; Poly compounds such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate Steers; Polyamides such as nylon; Polyimides such as polyimides, polyimides
  • these polymers can be used alone or in combination of two or more.
  • the transparent substrate it is preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles and the like. Furthermore, in transparent substrates, colorants such as pigments and dyes, optical brighteners, dispersants, plasticizers, heat stabilizers, light stabilizers, infrared absorbers, ultraviolet absorbers, antistatic agents, Ingredients such as antioxidants, lubricants and solvents may be contained.
  • the thickness of the transparent substrate is preferably 5 to 200 ⁇ m, more preferably 20 to 100 ⁇ m.
  • a hard coat layer may be provided on at least one surface of the window in order to prevent the surface of the transparent substrate from being scratched (for improving the scratch resistance).
  • the thickness of the hard coat layer is not particularly limited, but may be, for example, 2 to 100 ⁇ m. If the thickness of the hard coat layer is less than 2 ⁇ m, it will be difficult to secure sufficient scratch resistance. On the other hand, when the thickness of the hard coat layer exceeds 100 ⁇ m, the flexibility is lowered, and a problem of curling due to curing shrinkage may occur.
  • the hard coat layer can be formed by curing of a hard coat composition containing a reactive material that forms a crosslinked structure upon irradiation with active energy rays or thermal energy.
  • a reactive material that forms a crosslinked structure upon irradiation with active energy rays or thermal energy.
  • active energy rays those which form a crosslinked structure by irradiation with active energy rays, that is, those based on active energy ray curing are preferable.
  • An active energy ray is defined as an energy ray capable of decomposing a compound that generates an active species to generate an active species. Examples of active energy rays include visible light, ultraviolet light, infrared light, X-rays, ⁇ -rays, ⁇ -rays, ⁇ -rays and electron beams. Among these, it is particularly preferable to use ultraviolet light.
  • the hard coat composition contains a polymer of at least one of a radically polymerizable compound and a cationically polymerizable compound.
  • the radically polymerizable compound is a compound having a radically polymerizable group.
  • the radical polymerizable group may be any functional group capable of causing a radical polymerization reaction, and includes a group containing a carbon-carbon unsaturated double bond. Specifically, a vinyl group, a (meth) acryloyl group, etc. are mentioned.
  • these radically polymerizable groups may be identical to or different from each other.
  • the number of radically polymerizable groups that the radically polymerizable compound has in one molecule is preferably two or more from the viewpoint of improving the hardness of the hard coat layer.
  • the radically polymerizable compound is preferably a compound having a (meth) acryloyl group from the viewpoint of high reactivity, and is a polyfunctional acrylate monomer having 2 to 6 (meth) acryloyl groups in one molecule.
  • oligomers having a molecular weight of several hundred to several thousand having several (meth) acryloyl groups in a molecule called epoxy (meth) acrylate, urethane (meth) acrylate or polyester (meth) acrylate It is preferred to use.
  • the cationically polymerizable compound is a compound having a cationically polymerizable group such as an epoxy group, an oxetanyl group, and a vinyl ether group.
  • the number of cationically polymerizable groups that the cationically polymerizable compound has in one molecule is preferably 2 or more, and more preferably 3 or more, from the viewpoint of improving the scratch resistance of the hard coat layer.
  • the cationically polymerizable compound is preferably a compound having at least one cyclic ether group of an epoxy group and an oxetanyl group as a cationically polymerizable group.
  • the cyclic ether group is preferable from the viewpoint of small shrinkage associated with the polymerization reaction.
  • compounds having an epoxy group among cyclic ether groups are easy to obtain from the market compounds having various structures, and do not adversely affect the scratch resistance and durability of the obtained hard coat layer.
  • the compatibility with the radically polymerizable compound can be easily controlled.
  • oxetanyl group tends to have a higher degree of polymerization compared to epoxy group, is less toxic, and accelerates the network formation speed obtained from the cationically polymerizable compound of the obtained hard coat layer, and radically polymerizes Even in the region mixed with the compound, there is an effect that no unreacted monomer is left in the film. Furthermore, there are advantages such as forming an independent network.
  • a cationically polymerizable compound having an epoxy group for example, polyglycidyl ether of polyhydric alcohol having an alicyclic group; a compound containing a cyclohexene ring or a cyclopentene ring is epoxidized with a suitable oxidizing agent such as hydrogen peroxide or a peracid Aliphatic epoxy resins obtained by: aliphatic polyalcohols, polyglycidyl ethers of alkylene oxide adducts thereof, polyglycidyl esters of aliphatic long-chain polybasic acids, homopolymers of glycidyl (meth) acrylates, copolymers, etc.
  • a suitable oxidizing agent such as hydrogen peroxide or a peracid Aliphatic epoxy resins obtained by: aliphatic polyalcohols, polyglycidyl ethers of alkylene oxide adducts thereof, polyglycidyl esters of aliphatic long-
  • Aliphatic epoxy resins bisphenols such as bisphenol A, bisphenol F and hydrogenated bisphenol A, or alkylene oxide adducts thereof; glycidyl produced by reaction of epichlorohydrin with derivatives such as caprolactone adducts Such as ether and novolac epoxy resins; glycidyl ether epoxy resins derived from bisphenols are exemplified.
  • the hard coat composition may further contain a polymerization initiator.
  • a polymerization initiator a radical polymerization initiator, a cationic polymerization initiator, a radical, and a cationic polymerization initiator etc. are mentioned, for example. According to the kind of polymeric compound to be used among them, it can select suitably and can use.
  • These polymerization initiators are decomposed by at least one of active energy ray irradiation and heating to generate radicals or cations to advance radical polymerization and cationic polymerization.
  • the radical polymerization initiator may be capable of releasing a substance that initiates radical polymerization by at least one of active energy ray irradiation and heating.
  • a substance that initiates radical polymerization by at least one of active energy ray irradiation and heating for example, organic peroxides such as hydrogen peroxide and perbenzoic acid, and azo compounds such as azobisbutyronitrile can be mentioned.
  • Type 1 type radical polymerization initiators which generate radicals by molecular decomposition
  • Type 2 type radical polymerization initiators which generate radicals by hydrogen abstraction reaction in coexistence with tertiary amines And can be used alone or in combination.
  • the cationic polymerization initiator may be capable of releasing a substance that initiates cationic polymerization by at least one of active energy ray irradiation and heating.
  • a cationic polymerization initiator for example, aromatic iodonium salts, aromatic sulfonium salts, cyclopentadienyl iron (II) complexes and the like can be used. Depending on the difference in structure, these can initiate cationic polymerization either by active energy ray irradiation or heating or any of them.
  • the polymerization initiator may comprise 0.1 to 10% by weight with respect to 100% by weight of the total hard coat composition.
  • content of the polymerization initiator is less than 0.1% by weight, it is difficult to promote curing sufficiently, and it becomes difficult to realize the mechanical properties and adhesion of the finally obtained coating film.
  • content of the polymerization initiator exceeds 10% by weight, adhesion failure due to curing shrinkage, cracking and curling may occur.
  • the hard coat composition may further contain one or more selected from solvents and additives.
  • Any solvent may be used as long as it can dissolve or disperse the polymerizable compound and the polymerization initiator, and any solvent conventionally known as a solvent for hard coat compositions in the technical field may be used without limitation. it can.
  • an additive an inorganic particle, a leveling agent, a stabilizer, surfactant, an antistatic agent, a lubricant, an antifouling agent etc. are mentioned, for example.
  • the circularly polarizing plate is a functional layer having a function of transmitting only the right circularly polarized light component or the left circularly polarized light component. For example, external light incident on a display device is converted into right circularly polarized light, and the right circularly polarized light is reflected by the organic EL panel to become left circularly polarized light, and the left circularly polarized light is blocked by the circularly polarizing plate Can. As a result, a circularly polarizing plate is used in order to make the image easy to view by suppressing the influence of the reflected light and transmitting only the light emitting component of the organic EL.
  • a linear polarizing plate and a ⁇ / 4 retardation plate are laminated and combined, and the absorption axis of the linear polarizing plate and the slow axis of the ⁇ / 4 retardation plate
  • the angle should theoretically be 45 °, but practically it may be 45 ° ⁇ 10 °.
  • the linear polarizing plate and the ⁇ / 4 retardation plate do not necessarily have to be stacked adjacent to each other, as long as the relationship between the absorption axis and the slow axis satisfies the above range. It is preferred to achieve perfect circular polarization at all wavelengths. However, since it is not always necessary in practice, the circularly polarizing plate used for the flexible image display may include an elliptically polarizing plate. Furthermore, by laminating a ⁇ / 4 retardation film on the viewing side of the linear polarizing plate to make the outgoing light circularly polarized, it is also possible to improve the visibility in the state where the polarized sunglasses are worn.
  • the linear polarizing plate is a functional layer having a function of transmitting light vibrating in the transmission axis direction but blocking polarization of a vibration component perpendicular thereto.
  • the linear polarizing plate may be configured to include a linear polarizer alone or a linear polarizer and a protective film attached to at least one surface thereof.
  • the thickness of the linear polarizing plate may be 200 ⁇ m or less, preferably 0.5 to 100 ⁇ m. When the thickness of the linear polarizing plate exceeds 200 ⁇ m, the flexibility may be reduced.
  • the linear polarizer is a linear polarizing plate and functions as a polarizer layer, and examples thereof include a film type polarizer manufactured by dyeing and stretching a polyvinyl alcohol (PVA) -based film.
  • the dichroic dye is oriented by being drawn in a state in which a dichroic dye such as iodine is adsorbed to the PVA-based film oriented by stretching or adsorbed to the PVA molecule of the PVA-based film, and the polarization performance is exhibited. Do.
  • each step such as swelling, crosslinking with boric acid, washing with an aqueous solution, and drying may be included.
  • the stretching step and the dyeing step may be carried out with a PVA-based film alone, or may be carried out in a state of being laminated with another film such as polyethylene terephthalate.
  • the PVA-based film to be used preferably has a thickness of 10 to 100 ⁇ m and a stretching ratio of 2 to 10 times.
  • the linear polarizing plate having a film type polarizer as a linear polarizer and the circularly polarizing plate having the linear polarizing plate have been described above.
  • the thickness of the circular polarizing plate is described. It is preferable to further thin the film thickness and use a thin film polarizer (thin film polarizer).
  • mold polarizer which apply
  • liquid crystal polarizing compositions include those containing a liquid crystal compound and a dichroic dye compound.
  • the liquid crystal compound may have any property as long as it exhibits a liquid crystal state, and in particular, it is preferable to have a high-order alignment state such as a smectic phase because high polarization performance can be exhibited. Moreover, it is preferable to have a polymerizable functional group.
  • the dichroic dye compound is a dye that exhibits dichroism by aligning with a liquid crystal compound, and the dichroic dye itself may have liquid crystallinity and may have a polymerizable functional group. . Any of the compounds contained in a typical liquid crystal polarizing composition has a polymerizable functional group.
  • the liquid crystal polarizing composition preferably contains an initiator and a solvent, and may further contain an additive such as a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, and a silane coupling agent. .
  • the liquid crystal polarizing layer can be produced by applying a liquid crystal polarizing composition on an alignment film to form a liquid crystal polarizing layer.
  • a liquid crystal polarizing layer has the advantage of being able to be thinner than a film type polarizer.
  • the thickness of the liquid crystal polarizing layer is preferably 0.5 to 10 ⁇ m, more preferably 1 to 5 ⁇ m.
  • the alignment film may be produced on a base material by, for example, applying a composition for forming an alignment film on the base material using a suitable base material, and imparting alignment property by rubbing, irradiation with polarized light, etc. it can.
  • the alignment film forming composition may contain, in addition to the alignment agent, a solvent, a crosslinking agent, an initiator, a dispersant, a leveling agent, a silane coupling agent, and the like.
  • the alignment agent for example, polyvinyl alcohols, polyacrylates, polyamic acids, and polyimides can be used.
  • an alignment agent containing a cinnamate group When applying photoalignment (polarized light), it is preferable to use an alignment agent containing a cinnamate group.
  • the polymer used as an alignment agent may have a weight average molecular weight of about 10,000 to 1,000,000.
  • the thickness of the alignment film is preferably 5 to 10000 nm, and more preferably 10 to 500 nm, because the alignment control force is sufficiently expressed.
  • the liquid crystal polarizing layer formed on the base material provided with the alignment film can be peeled off from the base material, and the second base material is bonded to a laminate in which the base material, the alignment film and the liquid crystal polarizing layer are laminated,
  • the liquid crystal polarizing layer can also be transferred to this second substrate.
  • the second substrate can serve as a protective film, a retardation plate, and a transparent substrate of a window.
  • any transparent polymer film may be used, and materials exemplified as the transparent substrate and additives can be used. Among them, cellulose-based films, olefin-based films, acrylic films, and polyester-based films are preferably used. Further, it may be a coating type protective film obtained by applying and curing a cationic curing composition such as an epoxy resin or a radical curing composition such as an acrylate.
  • a cationic curing composition such as an epoxy resin or a radical curing composition such as an acrylate.
  • the thickness of the protective film may be 200 ⁇ m or less, preferably 1 to 100 ⁇ m. When the thickness of the protective film exceeds 200 ⁇ m, the flexibility may be reduced. In addition, the protective film can also serve as a window.
  • the ⁇ / 4 retardation plate is a film that gives a retardation of ⁇ / 4 in the direction (in-plane direction of the film) orthogonal to the traveling direction of the incident light.
  • the ⁇ / 4 retardation plate may be, for example, a stretched retardation plate manufactured by stretching a polymer film such as a cellulose-based film, an olefin-based film, or a polycarbonate-based film.
  • a retardation control agent if necessary, a plasticizer, an ultraviolet absorber, an infrared absorber, a coloring agent such as a pigment or a dye, a brightening agent, a dispersing agent, a heat stabilizer, a light stabilizer, an antistatic agent Antioxidants, lubricants, solvents and the like may be included.
  • the thickness of the stretched retardation plate may be 200 ⁇ m or less, preferably 1 to 100 ⁇ m. When the thickness of the stretched retardation plate exceeds 200 ⁇ m, the flexibility may be reduced.
  • a liquid crystal application retardation plate formed by applying and forming a liquid crystal composition may be used.
  • the liquid crystal composition for forming a liquid crystal coating type retardation plate includes, for example, a liquid crystal compound having a property of exhibiting a liquid crystal state such as nematic, cholesteric or smectic. Any of the liquid crystal compounds contained in the liquid crystal composition has a polymerizable functional group.
  • the liquid crystal composition may contain an initiator, a solvent, a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, a silane coupling agent, and the like.
  • the liquid crystal coating type retardation plate can be manufactured by coating and curing a liquid crystal composition on an alignment film to form a liquid crystal retardation layer, as described for the liquid crystal polarizing layer.
  • the liquid crystal coated retardation plate can be formed thinner than a stretched retardation plate. Specifically, the thickness of the liquid crystal polarizing layer is preferably 0.5 to 10 ⁇ m, more preferably 1 to 5 ⁇ m.
  • the liquid crystal coated retardation plate may be separated from the substrate, transferred and laminated, or the substrate may be laminated as it is.
  • the substrate can also serve as a protective film, a retardation plate, and a transparent substrate of a window.
  • the retardation plate has a larger birefringence as the wavelength is shorter, and often exhibits a smaller birefringence as the wavelength is longer.
  • a phase difference of ⁇ / 4 can not be given in the entire visible light region, it is often designed so as to be ⁇ / 4 in the vicinity of 560 nm where the visibility is high.
  • the in-plane retardation of the retardation plate is preferably 100 to 180 nm, more preferably 130 to 150 nm.
  • an inverse dispersion ⁇ / 4 retardation plate using a material having a birefringence and wavelength dispersion characteristics reverse to normal, because visibility can be improved.
  • a stretching type phase difference plate for example, those described in JP-A-2007-232873 can be used.
  • a liquid crystal coating type retardation plate those described in JP-A-2010-30979 can be used.
  • a technique for obtaining a wide band ⁇ / 4 retardation plate by combining the ⁇ / 4 retardation plate and the ⁇ / 2 retardation plate for example, JP-A-10-90521). No.2).
  • the ⁇ / 2 retardation plate is manufactured by the same material and method as the ⁇ / 4 retardation plate.
  • the combination of the stretching type retardation plate and the liquid crystal coating type retardation plate is optional, but both are preferable because the film thickness can be reduced by using the liquid crystal coating type retardation plate.
  • the circularly polarizing plate As the circularly polarizing plate, a method of laminating a positive C plate is also known in order to enhance the visibility in the oblique direction (see, for example, Japanese Patent Application Laid-Open No. 2014-224837).
  • the positive C plate may be a liquid crystal coated retardation plate or a stretching retardation plate.
  • the thickness direction retardation is preferably ⁇ 200 to ⁇ 20 nm, more preferably ⁇ 140 to ⁇ 40 nm.
  • a touch sensor is a typical member used as an input means of a flexible image display device.
  • various methods such as a resistive film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, and a capacitance method can be used, and among them, the capacitance method is used preferable.
  • the capacitive touch sensor is divided into an active area and a non-active area located at an outer portion of the active area.
  • the active area is an area corresponding to an area (display unit) in which a screen is displayed on the display panel, and is an area where a user's touch is sensed.
  • the non-active area is an area corresponding to an area (non-display portion) in which the screen is not displayed on the image display device.
  • the touch sensor is formed on a substrate having flexible characteristics, a sensing pattern formed on an active region of the substrate, and a non-active region of the substrate, and is connected to an external driving circuit through the sensing pattern and the pad portion. And each of the sensing lines.
  • the substrate having the flexible property preferably has a toughness of 2,000 MPa% or more from the viewpoint of crack suppression of the touch sensor. More preferably, the toughness is 2,000 MPa% to 30,000 MPa%.
  • “toughness” is a property obtained from a stress (MPa) -strain (%) curve (Stress-strain curve) obtained in a tensile test of a polymer material. That is, a tensile test is carried out to obtain a stress (MPa) -strain (%) curve from the start of stress application to the breaking point of the test polymer material, and is defined by the area of the obtained curve.
  • the sensing pattern may include a first pattern formed in a first direction and a second pattern formed in a second direction.
  • the first pattern and the second pattern are arranged in different directions.
  • the first pattern and the second pattern are formed in the same layer, and in order to sense a point to be touched, the respective patterns must be electrically connected.
  • the first pattern is a form in which each unit pattern is connected to each other through a joint.
  • each unit pattern is separated from each other in an island form. Therefore, a separate bridge electrode is required to electrically connect the second pattern.
  • the sensing pattern may use a known transparent electrode material.
  • a known transparent electrode material for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), cadmium tin oxide (CTO), PEDOT (poly (3, 4- ethylenedioxythiophene)), carbon nanotubes (CNT), graphene, metal wires and the like, and these can be used alone or in combination of two or more. Among them, it is preferable to use ITO.
  • the metal used for the metal wire is not particularly limited, and examples thereof include silver, gold, aluminum, copper, iron, nickel, titanium, telenium, chromium and the like. These can be used singly or in combination of two or more.
  • the bridge electrode can be formed on the top of the sensing pattern through the insulating layer.
  • the bridge electrode is formed on a substrate, and an insulating layer and a sensing pattern can be formed thereon.
  • the bridge electrode can also be formed of the same material as the sensing pattern, for example, a metal such as molybdenum, silver, aluminum, copper, palladium, gold, platinum, zinc, tin, titanium or an alloy of two or more of these Can be formed by
  • an insulating layer is formed between the sensing pattern and the bridge electrode.
  • the insulating layer can be formed only between the joint of the first pattern and the bridge electrode. Moreover, it can also be formed in the structure of the layer which covers a sensing pattern. In the latter case, the bridge electrode can be connected to the second pattern through the contact hole formed in the insulating layer.
  • the touch sensor measures the light transmittance induced by the difference in transmittance between the pattern region where the pattern is formed and the non-pattern region where the pattern is not formed, specifically, the difference in refractive index in these regions.
  • An optical adjustment layer may be further included between the substrate and the electrode as a means for appropriately compensating for the difference in
  • the optical adjustment layer may include an inorganic insulating material or an organic insulating material.
  • the optical control layer can be formed by coating a photocurable composition containing a photocurable organic binder and a solvent on a substrate. Additionally, the photocurable composition can include inorganic particles. The inorganic particles increase the refractive index of the optical adjustment layer.
  • the photocurable organic binder contained in the photocurable composition for example, a copolymer of monomers such as an acrylate monomer, a styrene monomer, and a carboxylic acid monomer can be used.
  • the photocurable organic binder may be, for example, a copolymer containing mutually different repeating units such as an epoxy group-containing repeating unit, an acrylate repeating unit, and a carboxylic acid repeating unit.
  • the photocurable composition can contain, for example, each additive such as a photopolymerization initiator, a polymerizable monomer, and a curing aid.
  • Each layer (window, circularly polarizing plate, touch sensor) forming a laminate for a flexible image display device, and film members (linearly polarizing plate, ⁇ / 4 retardation plate, etc.) constituting each layer are formed of an adhesive. It can bond via an adhesive layer.
  • the adhesive examples include water-based adhesives, organic solvents, solvent-free adhesives, solid adhesives, solvent volatilization adhesives, moisture curing adhesives, heat curing adhesives, anaerobic curing, active energy
  • a general-purpose adhesive such as a linear curing adhesive, a curing agent mixed adhesive, a heat melting adhesive, a pressure sensitive adhesive (pressure sensitive adhesive), a rewetting adhesive can be used.
  • water-based adhesives, solvent volatilization adhesives, active energy ray-curable adhesives, and pressure-sensitive adhesives are often used.
  • the thickness of the adhesive layer can be appropriately adjusted depending on the required adhesive strength and the like, and is preferably 0.01 to 500 ⁇ m, more preferably 0.1 to 300 ⁇ m.
  • the thickness and type of each adhesive layer may be the same or different.
  • the water-based adhesive mainly contains water, and a polymer in water dispersion state such as polyvinyl alcohol polymer, water-soluble polymer such as starch, ethylene-vinyl acetate emulsion, styrene-butadiene emulsion, etc. is used as a main polymer. be able to. Further, in addition to water and the main polymer, a crosslinking agent, a silane compound, an ionic compound, a crosslinking catalyst, an antioxidant, a dye, a pigment, an inorganic filler, an organic solvent and the like may be blended.
  • a polymer in water dispersion state such as polyvinyl alcohol polymer, water-soluble polymer such as starch, ethylene-vinyl acetate emulsion, styrene-butadiene emulsion, etc.
  • the thickness of the adhesive layer in the case of using a water-based adhesive is preferably 0.01 to 10 ⁇ m, more preferably 0.1 to 1 ⁇ m.
  • the thickness and type of each adhesive layer may be the same or different.
  • the active energy ray-curable adhesive can be formed by curing of an active energy ray-curable composition containing a reactive material that irradiates active energy rays to form an adhesive layer.
  • the active energy ray curable composition can contain at least one polymer of a radically polymerizable compound and a cationically polymerizable compound.
  • the radically polymerizable compound and the cationically polymerizable compound as used herein are the same as the radically polymerizable compound and the cationically polymerizable compound contained in the above-described hard coat composition.
  • the radically polymerizable compound contained in the active energy ray-curable adhesive used for forming the adhesive layer it is preferable to use a compound having an acryloyl group.
  • a monofunctional compound as the radically polymerizable compound.
  • the cationically polymerizable compound is the same as that described for the hard coat composition described above.
  • an epoxy compound is preferably used as the cationically polymerizable compound used for the active energy ray curing adhesive.
  • the active energy ray-curable adhesive can further contain a polymerization initiator.
  • the polymerization initiator is, for example, a radical polymerization initiator, a cationic polymerization initiator, a radical, a cationic polymerization initiator or the like, and can be appropriately selected and used according to the type of the polymerizable compound. Specific examples of these radical polymerization initiators, cationic polymerization initiators, radical and cationic polymerization initiators may be the same as those described for the polymerization initiators contained in the above-described hard coat composition.
  • the active energy ray-curable composition comprises an ion scavenger, an antioxidant, a chain transfer agent, an adhesion promoter, a thermoplastic resin, a filler, a flow viscosity modifier, a plasticizer, an antifoam solvent, an additive, It can contain solvents and the like.
  • an active energy ray-curable adhesive the active energy ray-curable composition is applied to either or both of the adherend layers and then laminated, and the active energy ray is applied through either of the adherend layers or both adherent layers. Can be adhered by irradiating and curing.
  • the thickness of the adhesive layer is preferably 0.01 to 20 ⁇ m, more preferably 0.1 to 10 ⁇ m. In the case of using a plurality of active energy ray-curable adhesives, the thickness and type of each layer may be the same or different.
  • the pressure-sensitive adhesive may contain, in addition to the main agent polymer, a crosslinking agent, a silane compound, an ionic compound, a crosslinking catalyst, an antioxidant, a tackifier, a plasticizer, a dye, a pigment, an inorganic filler, and the like.
  • Each component constituting the pressure-sensitive adhesive is dissolved and dispersed in a solvent to obtain a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition is applied to a substrate and then dried to form a pressure-sensitive adhesive layer adhesive layer. .
  • the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition the pressure-sensitive adhesive composition may be directly applied to an adherend, or separately formed on a substrate may be transferred.
  • the thickness of the adhesive layer is preferably 0.1 to 500 ⁇ m, more preferably 1 to 300 ⁇ m.
  • the thickness and type of each layer may be the same or different.
  • the light blocking pattern can be applied as at least a part of a bezel or a housing of a flexible image display.
  • the visibility of the image is improved by concealing the wiring disposed at the peripheral portion of the flexible image display device by the light shielding pattern and making it difficult to be visually recognized.
  • the light blocking pattern may be in the form of a single layer or multiple layers.
  • the color of the light shielding pattern is not particularly limited, and has various colors such as black, white and metal.
  • the light blocking pattern may be formed of a pigment for realizing a color and a polymer such as an acrylic resin, an ester resin, an epoxy resin, a polyurethane, and a silicone. Also, these may be used alone or as a mixture of two or more.
  • the light shielding pattern can be formed by, for example, various methods such as printing, lithography, and inkjet.
  • the thickness of the light shielding pattern is preferably 1 to 100 ⁇ m, more preferably 2 to 50 ⁇ m.
  • the light shielding pattern can be provided with a shape such as inclination in the thickness direction.
  • the film thickness of the above film, functional layer, element or the like can be measured using a general film thickness measuring method.
  • a film thickness measurement method for example, cross-sectional observation using an electron microscope, a method using a step difference meter, a film thickness measurement method using an optical interference method such as spectral interference method or laser interference method, and film thickness by spectral ellipsometry The measurement method etc. are mentioned.
  • FIG. 2 is a perspective view showing an example of the laser processing apparatus 30 used in the cutting process of the present embodiment.
  • the laser processing apparatus 30 shown in FIG. 2 is a laser irradiation apparatus (irradiation means) 31 for irradiating the polarizing plate FX with the laser light L and a laser for scanning the laser light L along the cutting line C of the polarizing plate FX.
  • a scanning device (scanning means) 32 and a drive control device (drive control means) 33 for controlling the drive of each part are provided.
  • FIG. 3 is a perspective view showing a specific configuration of the laser irradiation device 31.
  • the laser irradiation apparatus 31 shown in FIG. 3 comprises a first laser light source 34A for emitting a first laser light L1; a second laser light source 34B for emitting a second laser light L2; and a first laser light L1.
  • Dichroic mirror (optical path conversion means) 35 for transmitting or reflecting the laser light L2 and the second laser light L2 and emitting the first laser light L1 and the second laser light L2 in the same direction; the first laser A condensing lens (condensing optical system) 36 for condensing the light L1 and the second laser light L1 toward the polarizing plate FX; and an optical path between the dichroic mirror 35 and the condensing lens 36,
  • the first and second position adjusting mechanisms 37A and 37B position adjusting means for adjusting the irradiation position of the first laser light L1 and the second laser light L2 irradiated to the polarizing plate FX are provided.
  • the first laser light L1 and the second laser light L2 having different wavelengths are collectively described as the laser light L without distinction.
  • the first laser beam L1 and the second laser beam L2 are collectively treated as the laser beam L when it is not necessary to distinguish them.
  • the first laser light source 34A outputs the first laser light L1 by a pulse oscillation method.
  • the second laser light source 34B outputs the second laser light L2 having a wavelength different from that of the first laser light L1 by a pulse oscillation method.
  • a carbon dioxide gas (CO 2 ) laser oscillator is used as the first laser light source 34A
  • a YAG laser oscillator is used as the second laser light source 34B.
  • the first laser beam L1 is an infrared laser beam with a wavelength of 9.4 ⁇ m
  • the second laser beam L2 is an ultraviolet laser beam with a wavelength of 266 nm.
  • an excimer laser oscillator (ultraviolet laser light with a wavelength of 157 to 351 nm), a semiconductor laser (LD: Laser Diode) excitation solid pulsed laser oscillator (infrared laser light with a wavelength of 2940 nm), pulse fiber A laser oscillator (infrared laser light with a wavelength of 3 ⁇ m), a CO pulse laser oscillator (infrared laser light with a wavelength of 5.5 ⁇ m), or the like can also be used.
  • LD Laser Diode
  • the dichroic mirror 35 transmits either one of the first laser light L1 and the second laser light L2 having different wavelengths (the first laser light L1 in the present embodiment), and the other The laser light (in this embodiment, the second laser light L2) is reflected.
  • the first laser light L1 (one laser light) is reflected as the dichroic mirror 35, and the second laser light L2 is reflected. What transmits the (other laser light) may be used. Also, instead of the dichroic mirror 35, it is also possible to use a dichroic prism.
  • the condenser lens 36 is, for example, an f ⁇ lens, and this f ⁇ lens has a function of correcting the scanning speed of the laser beam L (L1, L2) to a constant.
  • the first and second position adjusting mechanisms 37A and 37B are, for example, galvano mirrors, and are scanners capable of scanning the laser light L (L1 and L2) biaxially in a plane parallel to the polarizing plate FX (scanning means Have a function as
  • the first position adjustment mechanism 37A has a mirror 38a that reflects the laser beam L (L1, L2) toward the second position adjustment mechanism 37B, and an actuator 39a that adjusts the angle of the mirror 38a.
  • the mirror 38a is attached to a rotating shaft 40a that is rotatable about the Z axis of the actuator 39a.
  • the second position adjustment mechanism 37B includes a mirror 38b that reflects the laser beam L (L1, L2) reflected by the mirror 38a of the first position adjustment mechanism 37A toward the condensing lens 36, and a mirror 38b. It has an actuator 39b for adjusting the angle, and has a structure in which a mirror 38b is attached to a rotating shaft 40b rotatable about the Y axis of the actuator 39b.
  • the drive control device 33 described later controls the drive of each of the actuators 39a and 39b, adjusts the angle of each of the mirrors 38a and 38b, and irradiates the polarizing plate FX It is possible to adjust the irradiation position of the laser beam L (L1, L2) by two-axis scanning.
  • the laser beam L indicated by the solid line in FIG. 3 is adjusted by adjusting the irradiation position of the laser beam L (L1, L2) irradiated to the polarizing plate FX.
  • (L1, L2) is focused on the focusing point Qa on the polarizing plate FX, or the laser light L (L1, L2) shown by the alternate long and short dash line in FIG. 3 is focused on the focusing point Qb on the polarizing plate FX
  • the laser beam L (L1, L2) shown by the two-dot chain line in FIG. 3 is possible to cause the laser beam L (L1, L2) shown by the two-dot chain line in FIG. 3 to be focused on the focusing point Qc on the polarizing plate FX.
  • the laser scanning device 32 comprises a slider mechanism (not shown) using, for example, a linear motor or the like, and the laser irradiation device 31 has a width of the polarizing plate FX under control of a drive control device 33 described later. It is possible to move and operate in the direction (X axis direction) V1, the length direction (Y axis direction) V2 of the polarizing plate FX, and the thickness direction (Z axis direction) V3 of the polarizing plate FX There is.
  • the laser scanning device 32 is not necessarily limited to the one that moves the laser irradiation device 31, and may move the polarizing plate FX itself. Also in this case, it is possible to scan (trace) the laser light L (L1, L2) from the laser irradiation device 31 along the cutting line C of the polarizing plate FX. In addition, both the laser irradiation device 31 and the polarizing plate FX may be moved.
  • the drive control device 33 is electrically connected to the first and second laser light sources 34A and 34B included in the laser irradiation device 31, and controls the driving of the first and second laser light sources 34A and 34B. Specifically, the drive control device 33 switches driving (ON / OFF) of the first laser light source 34A and the second laser light source 34B. The drive control device 33 controls the output and the number of pulse oscillations of the laser light L (L1, L2) emitted from the first and second laser light sources 34A, 34B.
  • the first laser beam L1 and the second laser beam L2 can be selectively irradiated to the polarizing plate FX. Further, it is possible to variably adjust the amount of energy per unit area of the laser beam L (L1, L2) irradiated to the polarizing plate FX.
  • the drive control device 33 is electrically connected to the laser scanning device 32 to control the moving speed of the laser scanning device 32. Thereby, the amount of energy per unit area of the laser beam L (L1, L2) irradiated to the polarizing plate FX can be variably adjusted while variably adjusting the scanning speed of the laser beam L (L1, L2) It is possible.
  • the drive control device 33 is electrically connected to the first and second position adjustment mechanisms 37A and 37B included in the laser irradiation device 31 to control the driving of the first and second position adjustment mechanisms 37A and 37B. . Thereby, it is possible to adjust the irradiation position of the laser beam L (L1, L2) irradiated to the polarizing plate FX by biaxial scanning.
  • the laminated film to be cut by the cutting method of the present invention includes at least a layer composed of a cycloolefin polymer such as a COP layer in order to exert the effects of the present invention.
  • FIGS. 4 (a) and 4 (b) are cross-sectional views sequentially showing the cutting process of the polarizing plate FX.
  • the polarizing plate FX When the polarizing plate FX is cut using the laser processing apparatus 30, first, as shown in FIG. 4A, while irradiating the first laser beam L1 to the polarizing plate FX, the polarizing plate FX is The first laser beam L1 is scanned along the cutting line C (referred to as a first scan).
  • the cutting line C may be set on the polarizing plate FX so as to obtain a sheet sheet piece of a desired size after cutting.
  • S5 is cut by the first laser beam L1. Further, in the first scan with the first laser beam L1, it is preferable to set the focal position U1 of the first laser beam L1 to a position deeper than the polarizer layer (PVA layer) S5.
  • the cutting groove V along the cutting line C is formed in the polarizing plate FX.
  • the cutting groove V is formed at a depth at which the protective layer (TAC layer) S4 on the upper layer side and the polarizer layer (PVA layer) S5 are divided.
  • the second laser light L2 is scanned along the cutting line C of the polarizing plate FX ( It is called the second scan.)
  • the lower protective layer (COP layer) S3 exhibiting a photolytic reaction by absorption of the second laser beam L2 is irradiated with the second laser beam L2. Disconnect.
  • the focal position U2 of the second laser beam L2 it is preferable to set the focal position U2 of the second laser beam L2 to a position deeper than the protective layer (COP layer) S3 on the lower layer side.
  • the cutting groove V is formed deeper in the depth direction from the position where the polarizer layer (PVA layer) S5 is divided so as to divide the lower protective layer (COP layer) S3. Therefore, in the main cutting step, it is possible to cut the polarizing plate FX along the cutting line C in the second scan.
  • the wavelengths of “COP”, “PVA”, “TAC”, and “PET” which are constituent materials of the lower protective layer S3, the polarizer layer S5, the upper protective layer S4, and the surface protective film S2 The transmittance for light of 2.0 to 14.0 ⁇ m is shown in FIG.
  • the transmittance for light with a wavelength of 200 to 500 ⁇ m is shown in FIG. 6 for “COP”.
  • the upper protective layer (TAC layer) S4 and the polarizer layer (PVA layer) S5 are layers that are relatively easy to cut (first Since it is a layer having a high absorptivity of the laser beam L1, it is cut by photolysis processing with little heat generation.
  • the protective layer (COP layer) S3 on the lower layer side is a layer which is relatively difficult to cut (a layer having a low absorptivity of the first laser beam L1), and thus cut by thermal processing by molecular vibration. Is worse.
  • the upper protective layer (TAC layer) S4 and the polarizer layer (PVA layer) S5 are cut by the first laser beam L1, and the lower protective layer (COP) Layer) S3 is cut by the second laser beam L2.
  • the layers S3, S5, and S4 is cut by photolysis processing which generates less heat, it is possible to obtain a cut surface with a good finish in the polarizing plate FX after cutting.
  • polarization is performed by cutting the polarizing plate FX by light decomposition processing with less heat generation using the first and second laser beams L1 and L2 having different wavelengths. It is possible to cut the plate FX precisely along the cutting line C. Further, since the finish of the cut surface of the polarizing plate FX is good without damaging the polarizing plate FX, it is possible to cope with the further narrowing of the display area in the optical display device.
  • FIG. 7 is a perspective view showing the configuration of the laser processing apparatus 30A.
  • part equivalent to the said laser processing apparatus 30 suppose that the same code
  • the laser processing apparatus 30A shown in FIG. 7 includes a first laser irradiation apparatus 31A that emits a first laser beam L1 instead of the laser irradiation apparatus 31 and a second laser that emits a second laser beam L2. And a radiation device 31B. That is, the laser processing apparatus 30A separately includes a first laser irradiation apparatus 31A having a first laser light source 34A and a second laser irradiation apparatus 31B having a second laser light source 34B.
  • the first and second laser irradiation devices 31A and 31B omit the dichroic mirror 35 from the configuration of the laser irradiation device 31.
  • the first or second laser beam L1 or L2 may be emitted from the first or second laser light source 34A or 34B to the first position adjustment mechanism 37A.
  • the first laser irradiation device 31A and the second laser irradiation device 31B are separately moved and operated by the laser scanning device 32, and are separately driven and controlled by the drive control device 33.
  • the first laser irradiation device 31A irradiates the polarizing plate FX with the first laser light L1, and the polarizing plate FX
  • the first laser beam L1 is scanned along the cutting line C of FIG.
  • the protective layer (TAC layer) S4 and the polarizer layer (PVA layer) S5 on the upper layer side among the layers S3, S5, and S4 constituting the polarizing plate FX are cut by the first laser beam L1.
  • the second laser irradiation device 31B scans the second laser light L2 along the cutting line C of the polarizing plate FX while irradiating the second laser light L2 to the polarizing plate FX.
  • the protective layer (COP layer) S3 on the lower layer side among the layers S3, S5, and S4 constituting the polarizing plate FX is cut by the second laser beam L2. Therefore, in the main cutting step, it is possible to cut the polarizing plate FX along the cutting line C in the second scan, as in the case of using the laser processing apparatus 30 shown in FIG.
  • the laser processing apparatus 30A shown in FIG. 7 When the laser processing apparatus 30A shown in FIG. 7 is used, while following the scanning of the first laser light L1 by the first laser irradiation apparatus 31A, the second laser light L2 by the second laser irradiation apparatus 31B It can scan. Therefore, when the laser processing apparatus 30A shown in FIG. 7 is used, it is possible to cut the polarizing plate FX at a higher speed than in the case where the laser processing apparatus 30 shown in FIG. 2 is used.
  • an adhesive layer is newly provided on the sheet piece cut out of the polarizing plate FX according to the embodiment of the present invention by applying an adhesive to the protective layer (COP layer) S3 on the lower layer side.
  • the liquid crystal panel may be bonded, or a retardation film or a brightness enhancement film may be bonded.
  • a polarizing plate FX ′ shown in FIG. 8 has surface protection on both the lower protective layer (COP layer) S3 and the upper protective layer (TAC layer) S4 sandwiching the polarizer layer (PVA layer) S5. It has the structure by which film (PET film) S2 was peelably bonded.
  • FIGS. 9 (a) to 9 (c) are cross-sectional views sequentially showing the cutting process of the polarizing plate FX '.
  • the polarizing plate FX ′ is cut using the laser processing apparatus 30, first, as shown in FIG. 9A, while irradiating the first laser beam L1 to the polarizing plate FX, the polarizing plate FX is The first laser beam L1 is scanned along the cutting line C (referred to as a first scan).
  • the upper surface side protective film (PET layer) showing photolysis reaction by absorption of the first laser beam L1.
  • a protective layer (TAC layer) S4 on the upper layer side and a polarizer layer (PVA layer) S5 are cut by a first laser beam L1.
  • the focal position U1 of the first laser beam L1 it is preferable to set the focal position U1 of the first laser beam L1 to a position deeper than the polarizer layer (PVA layer) S5.
  • a cutting groove V 'along the cutting line C is formed in the polarizing plate FX'.
  • the cutting groove V ' is formed with a depth that divides the upper surface side surface protective film (PET film) S2, the upper surface side protective layer (TAC layer) S4 and the polarizer layer (PVA layer) S5.
  • the second laser light L2 is scanned along the cutting line C of the polarizing plate FX ′ Yes (called the second scan).
  • the lower protective layer (COP layer) S3 exhibiting a photolytic reaction by absorption of the second laser beam L2. Is cut with a second laser beam L2. In the second scan with the second laser beam L2, it is preferable to set the focal position U2 of the second laser beam L2 to a position deeper than the protective layer (COP layer) S3 on the lower layer side.
  • cutting groove V ' is formed by the depth which divides lower layer side protective layer (COP layer) S3 in the depth direction from the position which divides light polarizer layer (PVA layer) S5 further.
  • the first laser light L1 is scanned along the cutting line C of the polarizing plate FX ′ Yes (called the third scan).
  • the lower surface-side surface protective film (PET film) showing photodegradation reaction by absorption of the first laser beam L1.
  • S2 is cut by the first laser beam L1.
  • cutting groove V ' is formed in the depth which divides surface protection film (PET film) S2 by the side of a lower layer in the depth direction from the position which divides protective layer (COP layer) S3 by the side of a lower layer. . Therefore, in the main cutting step, it is possible to cut the polarizing plate FX ′ along the cutting line C in the third scan.
  • PET film surface protection film
  • COP layer protective layer
  • the first and second laser beams L1 and L2 having different wavelengths are used to cut the polarizing plate FX ′ by light decomposition processing with less heat generation. It is possible to cut the polarizing plate FX ′ precisely along the cutting line C. In addition, it is possible to keep the cross-sectional quality of the cut polarizing plate FX 'in a good condition.
  • the first laser light L1 described above is used for the third laser light. If it is a laser beam which can cut
  • PET film disconnect surface protection film
  • a laser beam having a wavelength that can be cut by a photolysis reaction is appropriately selected and used according to the resin layer to be cut among the plurality of resin layers constituting the laminated film. Just do it.
  • the cutting method of the laminated film to which the present invention is applied is not limited to the case of cutting the above-described polarizing plates FX and FX ′, but in the cutting step of cutting the laminated film in which a plurality of resin layers of different materials are laminated, It is possible to apply the invention widely.
  • the method for producing a laminated film to which the present invention is applied widely applies the present invention to one including the above-described cutting step when producing a laminated film in which a plurality of resin layers of different materials are laminated. It is possible.
  • optical films such as a retardation film and a brightness enhancement film can be mentioned besides the above-mentioned polarizing plates FX and FX '.
  • polarizing plates FX and FX ' polarizing plates
  • stacked these optical films it is possible to apply the cutting method of this invention.
  • multilayer film other than a liquid crystal panel, an organic electroluminescent panel etc. may be sufficient, for example.
  • the number of laminations, etc. it is also possible to increase the number of times of scanning of the laser light, or to adjust the output and scanning speed of the laser light.
  • a method of scanning the laser light with respect to the cutting line a method of repeatedly scanning the laser light in one direction along the cutting line, a method of repeatedly reciprocatingly scanning the laser light between the start point and the end point of the cutting line, etc. It can be mentioned. Further, a method of simultaneously scanning a plurality of laser beams L along the cutting line can be mentioned.
  • SYMBOLS 30 Laser processing apparatus 31 Laser irradiation apparatus (irradiation means) 32 Laser scanning apparatus (scanning means) 33 Drive control apparatus (drive control means) 34A 1st laser light source 34B 2nd laser light source 35 dichroic Mirror (optical path conversion means) 36 ... condensing lens (condensing optical system) 37A ... first position adjustment mechanism 37B ... second position adjustment mechanism FX, FX '... polarizing plate (laminated film) S2 ...
  • PET film surface protective film
  • COP layer Protective layer on the lower layer side
  • TAC layer Protective layer on the upper layer side
  • PVC layer Polarizer layer
  • L Laser light
  • L1 First laser light (third laser light Light)
  • L2 ... second laser light C ... cutting line U1, U2, U3 ... focal position V, V '... cutting groove

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Abstract

L'invention concerne un procédé de découpe d'un film stratifié, qui est un procédé de découpe d'un film stratifié (FX) dans lequel le film stratifié (FX), obtenu par stratification d'une pluralité de couches de résine (S3, S5, S4) de matériaux différents, est découpé le long d'une ligne de découpe (C), la pluralité de couches de résine (S3, S5, S4) étant découpée par balayage de la ligne de découpe (C) du film stratifié (FX) à l'aide d'une pluralité de faisceaux laser (L1, L2) présentant des longueurs d'onde différentes. Plus précisément, parmi la pluralité de couches de résine (S3, S5, S4), les couches de résine (S45, S5) qui présentent une réaction de photodégradation par absorption du premier faisceau laser (L1) sont découpées à l'aide du premier faisceau laser (L1), et, parmi la pluralité de couches de résine (S3, S5, S4), la couche de résine (S3) qui présente une réaction de photodégradation par absorption du second faisceau laser (L2) est découpée à l'aide du second faisceau laser (L2).
PCT/JP2018/044899 2017-12-07 2018-12-06 Procédé de découpe et procédé de fabrication d'un film stratifié WO2019112000A1 (fr)

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KR1020207015578A KR102657288B1 (ko) 2017-12-07 2018-12-06 적층 필름의 절단 방법 및 제조 방법
CN201880077112.3A CN111432979A (zh) 2017-12-07 2018-12-06 层叠膜的切割方法及制造方法

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JP2018208864A JP7260993B2 (ja) 2017-12-07 2018-11-06 積層フィルムの切断方法及び製造方法
JP2018-208864 2018-11-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0810970A (ja) * 1994-06-22 1996-01-16 Sony Corp レーザ加工装置及び方法
WO2011016572A1 (fr) * 2009-08-06 2011-02-10 住友化学株式会社 Procédé de fabrication de plaques polarisantes
JP2017531813A (ja) * 2014-09-30 2017-10-26 エルジー・ケム・リミテッド 偏光板の切断方法およびこれを用いて切断された偏光板

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0810970A (ja) * 1994-06-22 1996-01-16 Sony Corp レーザ加工装置及び方法
WO2011016572A1 (fr) * 2009-08-06 2011-02-10 住友化学株式会社 Procédé de fabrication de plaques polarisantes
JP2017531813A (ja) * 2014-09-30 2017-10-26 エルジー・ケム・リミテッド 偏光板の切断方法およびこれを用いて切断された偏光板

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