WO2008026745A1 - Procédé de fabrication d'une puce à base d'une plaque de polarisation composite - Google Patents

Procédé de fabrication d'une puce à base d'une plaque de polarisation composite Download PDF

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Publication number
WO2008026745A1
WO2008026745A1 PCT/JP2007/067081 JP2007067081W WO2008026745A1 WO 2008026745 A1 WO2008026745 A1 WO 2008026745A1 JP 2007067081 W JP2007067081 W JP 2007067081W WO 2008026745 A1 WO2008026745 A1 WO 2008026745A1
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Prior art keywords
polarizing plate
coating
plate
sensitive adhesive
retardation
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PCT/JP2007/067081
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English (en)
Japanese (ja)
Inventor
Yuichiro Kunai
Akiko Nakazono
Yoshiki Matsuoka
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Sumitomo Chemical Company, Limited
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Publication of WO2008026745A1 publication Critical patent/WO2008026745A1/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
    • 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 method for producing a composite polarizing plate chip incorporated in a liquid crystal display. Specifically, in a composite polarizing plate including a fragile optical member composed of a coating layer, a composite polarizing plate capable of suppressing phenomena such as cracks and undulations that can occur in the fragile optical member when cutting into a product-sized chip. It is intended to provide a manufacturing method for plate product chips. Background art
  • liquid crystal displays In recent years, low-power consumption, low-voltage operation, lightweight and thin LCDs have rapidly become popular as information display devices such as mobile phones, personal digital assistants (PDAs), computer monitors, and televisions. ing. With the development of liquid crystal technology, liquid crystal displays in various modes have been proposed, and problems unique to liquid crystal displays such as response speed, contrast, and narrow viewing angle are being solved. However, it has been pointed out that the viewing angle is narrower than that of cathode ray tubes (CRT), and various attempts have been made to expand the viewing angle.
  • CTR cathode ray tubes
  • phase difference plates In general, in order to widen the viewing angle of such a liquid crystal display, an optical member called a retardation plate is often used.
  • phase difference plates There are various types of phase difference plates.
  • a resin stretch type phase difference plate in which a polymer resin film is stretched to express a phase difference, or optically anisotropic.
  • a coating type retardation plate in which a compound is coated and oriented on a base film, or an optically anisotropic compound dispersed in a binder resin to form a film and then stretched. + Stretch type retardation plate.
  • the retardation plate comprising a coating layer refers to a coating solution comprising a resin solution, a liquid in which a substance such as a filler having refractive index anisotropy is dispersed, a liquid crystal compound solution, etc.
  • the optical layer may be abbreviated as “coating retardation plate”.
  • Such a coating retardation plate is often used by being laminated with a polarizing plate after being combined with another retardation plate as necessary to form a composite retardation plate.
  • the base material on which the coating layer is formed has a desired optical function, it may be used as a composite retardation plate as it is, or a polyethylene terephthalate film that has been subjected to a release treatment, etc., has good releasability In some cases, a coating layer is formed on a substrate and then transferred to another optical member.
  • Patent Document 1 JP-A-2005-309290 discloses a composite polarizing plate in which a polarizing plate, an adhesive layer, and a coating retardation plate are laminated in this order.
  • Patent Document 2 discloses that a retardation plate made of a transparent resin film oriented in the plane is laminated with a coating retardation plate via an adhesive layer.
  • a composite phase difference plate is provided by providing an adhesive layer on the surface of the coating phase difference plate, and that a polarizing plate is laminated on the resin phase difference plate side.
  • JP-A-2006-10912 discloses that a composition comprising an urethane resin based on an aliphatic diisocyanate as a binder and an organically modified clay complex is formed into a film. It is disclosed that a coating phase difference plate is formed, and the coating phase difference plate is laminated on a polarizing plate through an adhesive layer to form a composite polarizing plate.
  • the mainstream of the plate is the “narrow frame” configuration, which has a very narrow margin from the edge of the polarizing plate to the part used for actual display (display area).
  • a retardation plate made of a coating layer which is produced when a product chip is cut from a large plate of a composite polarizing plate, or a flying distance of a wave is a problem.
  • the cracking distance of the crack means the distance that the cracks and undulations generated from the cut edge extend to the inside of the product chip.
  • an object of the present invention is to provide a method of manufacturing a composite polarizing plate product chip that can reduce phenomena such as cracks and undulations that occur when a composite polarizing plate including a thin and fragile layer is cut. is there.
  • the present inventors have conducted intensive research to suppress the phenomenon of cracks and undulations that are likely to occur during chip cutting of a composite polarizing plate including a very thin and fragile layer such as a coating retardation plate. It was. As a result, at least the coating phase difference plate and the polarizing plate are laminated, and the coating phase difference plate is sandwiched between the pressure sensitive adhesive layers on the upper and lower sides. Based on the position, it was found that if the blade is inserted from the side opposite to the side where the polarizing plate exists and the tip is cut, the flying distance of the waving becomes smaller.
  • the product of the tensile elastic modulus and the thickness of each layer is obtained, and attention is paid to the optical member having the maximum value.
  • the composite polarizing plate is cut by inserting a blade from the side including the optical member that maximizes the product of the tensile elastic modulus and the thickness with respect to the position of the retardation plate, it occurs in the coating retardation plate.
  • the flying distance of cracks and undulations increases, and conversely, the blade is inserted from the side not including the optical member that maximizes the product of the tensile elastic modulus and thickness. It has been found that if it is cut, the flying distance of the wavy can be sufficiently reduced.
  • Disclosure of the invention has been completed based on such findings and further various studies. Disclosure of the invention
  • At least a retardation plate and a polarizing plate comprising a coating layer having a thickness of 30 m or less are laminated, and the retardation plate comprising the coating layer has a tensile elastic modulus of 10 O.
  • This is a method of chip-cutting a composite polarizing plate sandwiched between pressure sensitive adhesive layers of MPa or less to the product size, all existing above and below the position of the phase difference plate consisting of the coating layer Among these optical components, there is a method of manufacturing a composite polarizing plate product chip by inserting a cutting blade from the side not including the optical member having the largest F value defined by the following formula (1).
  • the coating layer comprises at least a thickness of 30 / z ni or less.
  • a phase difference plate and a polarizing plate having a transparent protective layer are laminated on both sides of the polarizer, and the phase difference plate composed of the coating layer is vertically moved by a pressure sensitive adhesive layer having a tensile elastic modulus of 10 O MPa or less.
  • FIG. 1 is a cross-sectional view schematically showing a configuration example of a composite polarizing plate.
  • Fig. 2 An image showing the deformation behavior when the blade is inserted from the rigid member side.
  • FIG. 3 is a conceptual diagram showing the deformation behavior when a blade is inserted from the soft member side.
  • Fig. 4 Composition of composite polarizing plate used for analysis by finite element method in Example 1 and Comparative Example 1
  • FIG. 2 is a cross-sectional view (A) and a perspective view (B) schematically showing
  • FIG. 5 is a diagram showing the results of stress / strain analysis of Example 1.
  • FIG. 5 is a diagram showing the results of stress / strain analysis of Example 1.
  • FIG. 6 is a diagram showing the results of stress / strain analysis of Comparative Example 1.
  • FIG. 7 is a cross-sectional view (A) and a perspective view (B) schematically showing the configuration of the composite polarizing plate used in the experiment in Example 2 and Comparative Example 2.
  • FIG. 7 is a cross-sectional view (A) and a perspective view (B) schematically showing the configuration of the composite polarizing plate used in the experiment in Example 2 and Comparative Example 2.
  • Fig. 8 is a histogram showing the distribution of the maximum flight distance of cracks generated in the product chip in Example 2.
  • Fig. 9 A histogram showing the distribution of the maximum flight distance of the five cracks that occurred in the product chip in Comparative Example 2. Explanation of symbols
  • a coating phase difference plate having a thickness of 30 m or less and a polarizing plate are laminated, and the coating phase difference plate is sandwiched between pressure sensitive adhesive layers having a tensile elastic modulus l OO MPa or less.
  • This composite polarizing plate is chip-cut to the product size.
  • FIG. 1 An example of the layer structure of the composite polarizing plate targeted in the present invention is shown in a schematic cross-sectional view in FIG.
  • the composite polarizing plate in this example has a protective film 6 0 Z polarizing plate 1 0 in order from the top of the figure.
  • Pressure-sensitive adhesive layer 30 phase difference plate made of stretched resin film 40 / pressure-sensitive adhesive layer 3 0 Z coating phase difference plate 2 0 Z pressure-sensitive adhesive layer 3 0 Z separate film 70 A total of 8 layers are stacked.
  • the polarizing plate 10 usually has protective layers on both sides of the polarizer.
  • the polarizer is composed of a polyvinyl alcohol resin film in which dichroic dye such as iodine or dichroic organic dye is adsorbed and oriented.
  • the protective layers disposed on both sides are, for example, a cellulose resin such as triacetyl cellulose diacetyl cellulose, a cyclic polyolefin resin mainly composed of a polycyclic cyclic olefin such as norbornene, ethylene, and the like.
  • a transparent resin film composed of a polyolefin resin having a chain olefin as the main monomer, such as propylene, or a polypionate resin.
  • a film composed of these transparent resins and having a function as a retardation plate can be used as a protective layer.
  • these protective layers may be provided with a surface treatment layer such as an antireflection layer or a hard coat layer.
  • the polarizing plate 10 is considered to be one layer as a whole, including the polarizer and the protective layer, and if a surface treatment layer is provided.
  • the coating phase difference plate 20 is formed by applying a coating liquid made of a resin solution, a liquid in which a material such as a filler having refractive index anisotropy is dispersed, a liquid crystal compound solution, etc. It is an optical member produced by coating on top.
  • a preferable example of the coating retardation plate 20 is one formed by applying a coating liquid containing an organic modified clay complex and a binder resin in an organic solvent on a substrate and removing the solvent. be able to. Since the coating phase difference plate 20 is a layer formed by coating as described above, the thickness thereof is relatively small, specifically, 30 m or less, and may be 15 m or less. it can. For the coating phase difference plate 20, there is no particular limitation on the lower limit of the thickness, and it may be about 1 m, for example.
  • the composite polarizing plate to be used in the present invention is such that both the upper and lower surfaces of such a coating retardation plate 20 are sandwiched between pressure-sensitive adhesive layers 30 and 30.
  • the coating retardation plate 20 and its peripheral members are stacked by the following method. Can be layered. That is, once a coating layer is formed on a transfer substrate having a good releasability, such as a polyethylene terephthalate film that has been subjected to a release treatment, one pressure-sensitive adhesive layer 3 is formed on the exposed surface of the coating layer. After the transfer substrate is peeled and removed, another pressure-sensitive adhesive layer 30 is provided on the peeled surface together with other optical members if desired. In the configuration illustrated in FIG.
  • a coating phase difference plate 20 is formed in advance on the surface of a transfer substrate (not shown), and a pressure-sensitive adhesive provided on a separate film 60 on the exposed surface.
  • Adhesive layer 30 or pressure sensitive adhesive layer 30 provided on one side of phase difference plate 40 is adhered, and after the transfer substrate is peeled and removed, the other phase difference plate is placed on the release surface.
  • the pressure sensitive adhesive layer 30 with 40 or the separate film 60 can be produced by a method of laminating the pressure sensitive adhesive layer 30 with 30.
  • the organically modified clay complex used in the coating phase difference plate 20 is a complex of an organic substance and a clay clay.
  • it can be a composite of a clay mineral having a layered structure and an organic compound, and can be dispersed in an organic solvent.
  • clay minerals that have a layered structure include the smectite family and swellable mica, and their cation exchange capability allows complexation with organic compounds.
  • the smectite group is preferably used because of its excellent transparency.
  • those belonging to the smectite family include hectorite, montmorillonite, and bentonite. Of these, those chemically synthesized are preferable in that they have few impurities and are excellent in transparency.
  • synthetic hectorite with a controlled particle size is preferably used because scattering of visible light is suppressed.
  • organic compounds that are complexed with clay minerals include compounds that can react with oxygen atoms and hydroxyl groups of clay minerals, and ionizable compounds that can be exchanged for exchangeable cation.
  • ionizable compounds that can be exchanged for exchangeable cation.
  • nitrogen-containing compounds include primary, secondary or tertiary amines, and quaternary ammonium compounds.
  • a quaternary ammonium compound is preferably used.
  • the quaternary ammonium compound include those having a long-chain alkyl group and those having an alkyl ether chain.
  • a class ammonium compound is preferred. More preferably, it has an alkyl group having 6 to 10 carbon atoms.
  • an organically modified clay complex is composed of an organic compound and a clay mineral belonging to the smectite group
  • the clay mineral belonging to the smectite group can be swollen or dispersed in an organic solvent in the state of a complex with the organic compound.
  • clay minerals in which exchangeable cations are difficult to exchange with ionic organic compounds are difficult to disperse in organic solvents.
  • magnesium compounds such as magnesium hydroxide are often attached to the surface, and if the amount of such magnesium compounds is large, the exchangeable cation sites Will be disturbed. Therefore, the magnesium compound present on the surface is removed by pickling to reduce the abundance ratio of magnesium.
  • the atomic ratio of magnesium to 4 atoms is less than 2.73. Some are preferable because they are easily dispersed in an organic solvent. For example, hectrites belonging to the smectite group are typically shown in the “Chemical Dictionary” (Kyoritsu Publishing Co., Ltd., first published on February 28, 1947) edited by the Editorial Committee of the Chemical Dictionary. the Na 0. 66 (Mg 5. 34 Li 0.
  • Si 8 0 20 (OH) 4 ⁇ n3 ⁇ 40 or Na 1/3 (Mg 8/3 Li 1/3) Si 4 0 10 (OH) 2 ⁇ mH 2 0 is represented by the composition formula, although Mg / S i 4 atomic ratio in that state is 2.67, the click to the combining Toraito, magnesium compounds present in the surface as described above, MGZ S i 4 atomic ratio Is slightly larger than 2.67.
  • a magnesium compound having an Mg / Si 4 atomic ratio as close to 2.67 as possible by removing the magnesium compound present on the surface by acid cleaning or the like is preferably used.
  • sodium becomes an exchangeable cation, which is an organic compound such as quaternary ammonium. Since it becomes an organically modified clay complex by exchanging with the group, the Mg ZS i 4 atomic ratio does not change before and after modification. Therefore, to make the Mg / Si 4 atomic ratio of the organically modified clay complex less than 2.73, it is effective to wash the clay mineral before modification with an organic substance with an acid.
  • organically modified clay composites compounds containing chlorine are often mixed as impurities due to the raw materials used in the production. If the amount of such a chlorinated compound is large, there is a possibility of pre-out from the film after forming a coating phase difference plate. In that case, when the coating phase difference plate is bonded to the liquid crystal cell glass via a pressure-sensitive adhesive, the adhesive strength is significantly reduced over time. Therefore, it is preferable to remove the chlorine compound from the organically modified clay complex by washing, and it can be contained in the organic solvent in a state where the amount of chlorine contained in the organic modified clay complex is 2,000 ppm or less. For example, a decrease in the adhesive strength can be suppressed. The removal of the chlorine compound can be performed by washing the organically modified clay complex with water.
  • Two or more organically modified clay composites can be used in combination.
  • Commercially available products of suitable organically modified clay composites include synthetic hectrites and quaternary ammonium compounds sold under the trade names of “Lucentite STN” and “Lucentite SPN” by Co-op Chemical Co., Ltd. There is a complex.
  • Binder-one resins used in combination with organically modified clay composites are those that dissolve in organic solvents such as toluene, xylene, acetone, and ethyl acetate, especially those that have a glass transition temperature of room temperature or lower (approximately 20 ° C or lower). Are preferably used. In addition, in order to obtain good wet heat resistance and handleability required for application to liquid crystal displays, those having hydrophobic properties are desirable.
  • binder resin examples include polyvinyl alcohol resins such as polyvinyl propylal and polyvinyl formal, cellulose resins such as cellulose acetate butyrate, acrylic resins such as butyl acrylate, urethane resins, Metaak Examples include ril-based resins, epoxy resins, and polyester resins.
  • binder resins include polyvinyl alcohol aldehyde-modified resins sold under the trade name “Denkabu Tyral # 3000-K” from Denki Kagaku Kogyo Co., Ltd., and “Aron S1601” from Toagosei Co., Ltd. There are acrylic resins sold under the trade name "Isophorone diisocyanate-based urethane resin” sold by Sumika Bayer Urethane Co., Ltd. under the trade name "SBU Lacquer 0866". Among these, urethane resins based on isophorone diisocyanate are preferably used as the binder resin.
  • the ratio of the organically modified clay complex dispersible in the organic solvent and the binder resin may be in the range of 1: 2 to 10: 1, especially in the range of 1: 1 to 2: 1, by weight ratio of the former: latter. It is preferable for improving the mechanical properties such as preventing cracking of the layer composed of the organically modified clay composite and the binder resin.
  • the organic modified clay complex and the binder resin are contained in an organic solvent to form a coating solution, for example, applied onto a transfer substrate.
  • the binder resin is dissolved in an organic solvent, and the organic modified clay complex is dispersed in the organic solvent.
  • the solid content concentration of this dispersion liquid is not limited as long as the dispersion liquid after preparation is not gelled or white turbid as long as there is no practical problem, but usually the total solid content of the organically modified clay complex and the binder resin. It is used in a range where the concentration is about 3 to 15% by weight.
  • the optimum solid content concentration varies depending on the type of organically modified clay composite and binder / resin, and the composition ratio of the two, so it is set for each composition.
  • various additives such as a viscosity adjusting agent for improving coatability during film formation and a crosslinking agent for further improving hydrophobicity and Z or durability may be added.
  • the coating method used to form the coating phase difference plate 20 is not particularly limited, and direct gravure method, reverse gravure method, die coating method, comma coating method, bar coating method, etc. Various known coating methods can be used.
  • the refractive index anisotropy in the thickness direction of the coating phase difference plate is the refractive index in the in-plane slow axis direction.
  • nx is the refractive index in the direction perpendicular to the in-plane direction (fast axis direction)
  • ny is the refractive index in the thickness direction
  • nz is the thickness of the film. It is represented by the direction phase difference value R th . This value can be calculated from the phase difference value R 4 () measured by tilting the in-plane slow axis by 40 degrees and the in-plane phase difference value R Q.
  • the retardation value Rth in the thickness direction according to Equation (2) is the in-plane retardation value R Q
  • the retardation value R 4 () measured by tilting the slow axis by 40 degrees and the thickness of the film d, and the average refractive index no of the film are used to calculate nx, ny, and nz by numerical calculation from the following formulas (3) to (5), and substitute these into formula (2) to calculate: it can.
  • Equation (3) is a defining equation representing the in-plane retardation value.
  • ny ' nyx nz / (ny 2 Xsin 2 ((+ nz 2 Xcos 2 ()) 1/2
  • the thickness direction retardation R th for coating retardation plate is within the range of about 40 to 30 onm, its application, in particular according to the characteristics of the liquid crystal cell is preferably selected as appropriate.
  • the thickness direction retardation value R th is preferably 5 Onm or more, and more preferably 20 Onm or less.
  • the pressure-sensitive adhesive layer 30 is also called an adhesive, and can be composed of a base polymer such as an acrylic polymer, silicone polymer, polyester, polyurethane, or polyester.
  • a base polymer such as an acrylic polymer, silicone polymer, polyester, polyurethane, or polyester.
  • acrylic pressure-sensitive adhesives it has excellent optical transparency, retains appropriate wettability and cohesion, has excellent adhesion to substrates, and has weather resistance and heat resistance. It is preferable to select and use those that do not cause peeling problems such as floating and peeling under the conditions of heating and humidification.
  • the number of carbon atoms such as methyl, ethyl, and butyl groups An alkyl ester of acrylic acid having an alkyl group of 20 or less, and a functional group-containing acrylic monomer composed of (meth) acrylic acid or (meth) hydroxyethyl acrylate, preferably have a glass transition temperature of 2
  • An acrylic copolymer having a weight average molecular weight of 100,000 or more and blended so as to be 5 ° C. or lower, and further 0 ° C. or lower is useful as a base polymer.
  • the pressure-sensitive adhesive layer 30 is made of a soft base polymer as described above, and its tensile elastic modulus is 10 O MPa or less, and is usually smaller, for example, 1 O MPa or less.
  • the lower limit of the tensile elastic modulus is not particularly limited, and may be, for example, about 0.0 I MPa.
  • the retardation plate 40 provided as necessary can be composed of a stretched film of a transparent thermoplastic resin.
  • the thermoplastic resin include, for example, polycarbonate, polyarylate, polysulfone, polyethersulfone, cellulosic resin, polyolefin resin mainly containing olefins such as propylene and ethylene, and polycyclic resins such as norbornene. Examples thereof include cyclic polyolefin resins having cyclic olefin as the main monomer.
  • the in-plane retardation of the retardation film 40 may be appropriately selected from the range of about 30 to 30 nm depending on the use of the composite polarizing plate.
  • the retardation plate 40 is advantageously a 1 Z4 wavelength plate. Two or more retardation plates 40 may be used as needed, and a pressure-sensitive adhesive is usually used for bonding in that case.
  • the protective film 60 is a resin film used for protecting the surface of the polarizing plate 10, and a pressure-sensitive adhesive having a weak adhesive force is provided on the sticking surface.
  • the separate film 70 is also a resin film used to protect the outermost pressure-sensitive adhesive layer 30, and is usually attached to the pressure-sensitive adhesive layer 30. A mold release process has been performed.
  • These protective films 60 can be made of a transparent resin such as polyethylene terephthalate.
  • other optical members may be laminated. Examples of other optical members include a brightness enhancement film.
  • a brightness enhancement film is an optical film that can increase the efficiency of use of backlight light in a liquid crystal display. For example, polarized light that transmits certain types of polarized light and has the opposite properties.
  • DBEF a reflective polarizing separation film sold by 3M Co immediately any [Sumitomo 3EM Co., Ltd. in Japan].
  • the polarizing plate 10 and the coating retardation plate 20 are essential, and the pressure-sensitive adhesive layers 30 and 3 having both upper and lower surfaces of the coating retardation plate 20 having a tensile elastic modulus of 10 O MPa or less.
  • the polarizing plate 10 includes the polarizer and the protective layer, and if a surface treatment layer is provided, the whole includes the polarizer. Although it is considered as one layer, the other optical members determine the tensile modulus of elasticity for one layer each.
  • the coating phase difference plate 20, the pressure sensitive adhesive layer 30, the phase difference plate 40, the protection film 60 and the separate film 70 correspond to the other optical members.
  • each layer determines the tensile modulus of elasticity.
  • a brightness enhancement film as described above, consider each layer one by one.
  • Equation (1) can also be expressed as the following equation (l a) where the tensile elastic modulus in the direction perpendicular to the cut side of each optical member is d and the thickness is d.
  • This tensile elastic modulus ⁇ is a value that is uniquely determined if it is an isotropic material. However, in the case of an anisotropic material, the value changes depending on the direction of pulling, so that it is near the side to be cut. In contrast, the tensile modulus in the vertical direction is used.
  • the tensile modulus of the long side when cutting into the product chip ie, the tensile modulus of elasticity in the short side of the product chip
  • the tensile modulus of elasticity of the short side ie, the tensile modulus of elasticity in the long side of the product chip
  • the larger of ⁇ 1 and H2 is used as the hi.
  • the tensile elastic modulus Q! L and ⁇ 2 may be measured based on the actual cutting angle, but the tensile elastic modulus measured in the direction in which the maximum elastic modulus is exhibited and the tensile strength in the direction perpendicular thereto are measured. If there is an elastic modulus, the tensile elastic modulus in all directions can be calculated based on the following equation (7).
  • ⁇ ⁇ v Xcos 4 0 + a, Xsin 4 0 + 2 XQ Xcos 2 ⁇ Xsin 2 0 + 4 XG Xcos 2 ⁇ Xsin 2 ⁇
  • Q and G are the following values respectively.
  • Li is a value called Poisson's ratio. Originally, a physical property defined by the ratio of the amount of strain in the tensile direction when pulled in a certain direction and the amount of strain in the direction perpendicular thereto. Although it is a value, here we will use a general material value of 0.3 for all calculations.
  • the thickness d can be easily measured for each optical member using, for example, a contact-type film thickness meter.
  • the optical member present on one side of the coated retardation plate 20 is a protective film 60 Z polarizing plate 10 0 Z pressure-sensitive adhesive layer 30 / retardation plate 40 0 Z pressure-sensitive type
  • the optical member on the other side of the coating phase difference plate 20 (the lower side in FIG. 1) is a pressure-sensitive adhesive layer 3 0 Z separate film 70 0 2 Is a layer.
  • the optical member having the maximum F value is usually the polarizing plate 10.
  • cracks are undulated by inserting the blade of the chip cutter from the side not including the polarizing plate 10, that is, from the lower side in the example shown in FIG. 1, based on the position of the coating retardation plate 20.
  • the flight distance can be reduced.
  • a polarizing plate having a transparent retardation layer on both sides of a coating phase difference plate 20 having a thickness of 30 fim or less and a polarizer without obtaining the tensile modulus of elasticity ⁇ of each optical member constituting the composite polarizing plate. 10 is laminated, and the coating retardation plate is sandwiched from above and below by a pressure-sensitive adhesive layer having a tensile elastic modulus of 10 O MPa or less.
  • a cutting blade may be inserted from the side opposite to the side where the polarizing plate 10 exists, and the product chip may be cut.
  • the composite polarizing plate When the composite polarizing plate is cut, it is cut in order from the member at the top on the side where the blade is inserted. At this time, as each member is cut sequentially, the stress distribution applied to the coating phase difference plate 20 depends on the elastic modulus of the member being cut, and thus changes as the layer is cut. . If there is a member with a large F value in front of the coating retardation plate 20, that is, a rigid member, the stress generated during cutting will be dispersed over a relatively wide range, so the cutting surface of the composite polarizing plate (the end surface of the product) As a result, stress is applied to a position farther away from the coating, and the flying distance of the crack generated in the coating phase difference plate 20 increases.
  • Fig. 2 is a visual representation of the deformation behavior when a blade is inserted from the rigid member side. The stress P generated by inserting the cutting blade causes the deformation to reach a wide range. This means that
  • Fig. 3 is a visual representation of the deformation behavior when a blade is inserted from the soft member side, and shows that the deformation due to the stress P generated by inserting the blade for cutting stays locally. ing.
  • FIG. 4 A finite element model was created for the composite polarizing plate with the structure shown in Fig. 4, and a fracture growth simulation was performed using the finite element method to analyze the stress and strain generated.
  • (A) in Fig. 4 is a cross-sectional view schematically showing the layer structure
  • (B) is a schematic diagram showing the axial relationship of each layer. It is a perspective view shown typically.
  • the composite polarizing plate shown in FIG. 4 includes, in order from the top of the figure, a protective film 6 0 Z polarizing plate 1 0 Z pressure-sensitive adhesive layer 3 0 Z first retardation plate 4 1 Z pressure-sensitive adhesive layer 3 0 Z
  • Two phase difference plates 4 2 Z pressure sensitive adhesive layer 3 0 / coating phase difference plate 2 0 Z pressure sensitive adhesive layer 3 0 is composed of a total of nine layers.
  • the protective film 60, the four pressure-sensitive adhesive layers 30 and the coating retardation plate 20 are optically isotropic in the plane.
  • the flow direction of the polarizing plate 10, the first phase difference plate 41, and the second phase difference plate 42 is shown in the same figure with the short side direction after cutting shown in FIG.
  • the flow direction here refers to the flow direction of each film supplied in the form of a roll (long direction of the roll).
  • the flow direction of the polarizing plate 10 is the stretching direction and corresponds to the absorption axis, and the flow directions of the first retardation plate 41 and the second retardation plate 42 are both the stretching direction and correspond to the slow axis. To do. Under such conditions, a simulation was performed in the case where the short side direction of the composite polarizing plate was the force side.
  • each optical member was set as shown in Table 1, and Table 1 shows the F values obtained from these.
  • Table 1 the one with the highest F value is underlined. According to this, since the optical member with the largest F value is the polarizing plate 20, the stress and strain applied to the coating phase difference plate were analyzed when cut from the side not including this (the lower side in FIG. 4). .
  • the z-axis is the thickness direction of the composite polarizing plate
  • the y-axis (the axis that cuts the paper perpendicularly) is the cut edge direction
  • the X-axis is the direction perpendicular to the cut edge.
  • the display in Fig. 6 is the same as in Fig. 5.
  • the stress strain
  • the stress extends from the vicinity of the cut edge to a wide range inside the composite polarizing plate, and it can be seen that the range of influence is large.
  • FIG. 7 A large composite polarizing plate having the structure shown in FIG. 7 was prepared.
  • (A) of FIG. 7 is a cross-sectional view schematically showing the layer structure
  • (B) is a perspective view schematically showing the axial relationship of each layer.
  • the composite polarizing plate produced in this example is shown in the order from the top of FIG. 7 in the order of the protective film 60 0 brightness enhancement film 50
  • Z pressure-sensitive adhesive layer 30 Z polarizing plate 10
  • Z pressure-sensitive adhesive layer 30 Z 1 Retardation plate 4 1 Z pressure-sensitive adhesive layer 3 0 / second retardation plate 4 2 Z pressure-sensitive adhesive layer 3 0 Z coating phase difference plate 2 0 Z pressure-sensitive adhesive layer 3 0 Z separate film 7 0 Total 1 Consists of 2 layers.
  • the five pressure-sensitive adhesive layers 30 and the coating phase difference plate 20 are optically isotropic in the plane.
  • the short side direction after cutting shown in (B) of FIG. 7 is set to 0 °, and the brightness enhancement film 50 and the protective film 60 provided thereon, the polarizing plate 10, the first retardation plate 4 1
  • the flow directions of the second retardation film 4 2 and the separate film 70 on the pressure-sensitive adhesive layer 30 were arranged so as to be at angles shown in FIG.
  • the flow direction here refers to the flow direction of each film supplied in a roll shape (long direction of the roll).
  • the flow direction of the brightness enhancement film 50 corresponds to the transmission axis
  • the flow direction of the polarizing plate 10 corresponds to the stretching direction and corresponds to the absorption axis.
  • the first retardation plate 4 1 and the second retardation plate 4 2 These flow directions are all stretching directions and correspond to the slow axis.
  • optical members used in this example are commercially available products except for the coated retardation plate 20 and are as follows.
  • Brightness-enhancement film 50 “DBEF” (trade name) in which two types of polymer films sold by Sumitomo 3EM Co. are stacked alternately. It can be obtained with both sides of a protective film made of polyethylene terephthalate.
  • Pressure-sensitive adhesive layer 30 (same for all five layers): Sold by Lintec Corporation Acrylic pressure sensitive adhesive "P-3132" (trade name). It can be obtained in a state where a separate film made of polyethylene terephthalate is bonded to both sides. In addition, the thing from which thickness differs by the location to arrange
  • Polarizing plate 10 “SRW062A” (trade name) in which a triacetyl cellulose film is bonded as a protective layer on both sides of a polyvinyl alcohol-iodine polarizer sold by Sumitomo Chemical Co., Ltd.
  • First retardation plate 4 1 “SES430240Z” (trade name) with an in-plane retardation of 24 4 nm with a stretched film of norbornene resin sold by Sumitomo Chemical Co., Ltd.
  • Second retardation plate 4 2 “SES430120Z” (trade name) with an in-plane retardation of 12 O nm with a stretched film of norbornene resin sold by Sumitomo Chemical Co., Ltd.
  • the coating phase difference plate 20 includes a second phase difference plate 42 and a pressure-sensitive adhesive layer 30 on the upper side in the figure, and a separate film 70 and pressure-sensitive adhesive layer on the lower side.
  • a combination with 30 was produced as follows.
  • the coating liquid for coating retardation plate having the following composition was applied to the release treatment surface of the polyethylene terephthalate film having a thickness of 3 8 (1 (referred to as “release film”). Dry at 90 ° C for 3 minutes to form a coated retardation plate 20.
  • the second retardation plate 4 2 (“SES430120Z”) having the pressure-sensitive adhesive layer 30 attached to the coating layer side is bonded to the pressure-sensitive adhesive layer side.
  • the pressure sensitive adhesive layer 3 provided on the separate film 70 on the release film peeling surface of the coating phase difference plate 20.
  • P-3132 and the second retardation plate 4 2 Z pressure-sensitive adhesive layer 3 0 Z coating phase difference plate 2 0 / pressure-sensitive adhesive layer 3 0 noseparate film 70
  • SBU Lacquer 0866 (trade name): A polyurethane resin based on isophorone diisocyanate sold by Sumika Bayer Urethane Co., Ltd., with a solid content of 30%.
  • the maximum tensile modulus was measured using a universal tensile testing machine [Precision universal testing machine "Autograph AG-1" sold by Shimadzu Corporation], and contact type membrane Thickness d was measured using a thickness gauge. These are shown in Table 2, and the F value calculated as the product of these is also shown in Table 2. In Table 2, the one with the highest F value is underlined. According to this, the optical member having the largest F value is the polarizing plate 20. ⁇
  • Pressure-sensitive adhesive layer 15X10-3 P-3132 (In-plane isotropic) 0.19 0.003 Polarizer 105X10-3 SRW062A 118 5, 705 599.0 Pressure-sensitive adhesive layer 15X10-3 P-3132 (In-plane isotropic) 0.19 0.003 First retardation plate 33X10-3 SES430 240Z 12 2, 370 78.2 Pressure sensitive adhesive layer 15X10-3 P-3132 (In-plane isotropic) 0.19 0.003 Second retardation plate 28X10-3 SES430 120Z 135 2,229 62.4 Pressure sensitive adhesive Agent layer 15X10 1 3 P-3132 (In-plane isotropic) 0.19 0.003 Coating 9X10-3 ⁇ (In-plane isotropic) 2.0 0.02 Phase plate
  • the defect flight distance is defined as the defect that enters the innermost side (the center of the product chip) from the cut surface (end of the product chip) among the multiple defects that exist in one chip [ That is, the distance from the inner edge of the defect to the end of the product chip closest to that point was taken as the largest (longest) defect.
  • Figure 8 shows a result of examining the distance traveled for about 200 product chips in this way and analyzing the distribution as a histogram.
  • Example 2 The same large-sized composite polarizing plate as in Example 2 was produced. Based on the position of the coating phase difference plate 20, insert a single blade of push-cut from the side including the polarizing plate 20, which is the optical member with the largest F value (upper side in FIG. 7). Cut into product chips of the same dimensions as 2. Using the same method as in Example 1, the distance of defects such as cracks and undulations generated on the coating phase difference plate 20 was examined with a microscope for the cut product chips. Figure 9 shows the defect flight distance of about 500 product chips and a histogram of the distribution. As can be seen from the comparison between Fig. 8 and Fig. 9, in Comparative Example 2 (Fig. 9), defects spread out inside the composite polarizing plate, whereas in Example 2 (Fig. 8), defect skipping occurred. The distance was concentrated near the edge of the composite polarizing plate, and the defect flight distance could be reduced. Industrial applicability
  • the coating retardation plate and the polarizing plate are laminated.
  • the composite polarizing plate it is possible to greatly reduce the phenomenon of cracks and undulations that are likely to occur on the end face of the coating phase difference plate when chip-cutting it, thereby improving the product yield, The display quality of the liquid crystal display to which it is applied can be improved.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)

Abstract

Une plaque de polarisation composite est formée en recouvrant au moins une plaque à différence de phase (20) formée par une couche de revêtement ayant une épaisseur qui n'est pas supérieure à 30 µm et par une plaque de polarisation (10). La plaque de polarisation composite se trouve entre des couches adhésives sensibles à la pression (30, 30) présentant un module d'élasticité en tension qui n'est pas supérieur à 100 Mpa. Lors de la découpe de la plaque de polarisation composite suivant une taille de produit d'une puce, une lame de coupe est introduite depuis la face n'incluant pas l'organe optique présentant le plus grand F, qui est défini par l'expression : F [MPa·mm] = module d'élasticité en tension, dans la direction verticale vers le bord de coupe entre tous les organes optiques se trouvant au-dessus et en dessous de la plaque à différence de phase (20) formée par la couche de revêtement, à savoir depuis la surface de la face n'incluant pas la plaque de polarisation (10).
PCT/JP2007/067081 2006-08-31 2007-08-27 Procédé de fabrication d'une puce à base d'une plaque de polarisation composite WO2008026745A1 (fr)

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JP2006235409A JP2008058599A (ja) 2006-08-31 2006-08-31 複合偏光板製品チップの製造方法
JP2006-235409 2006-08-31

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JPWO2014175462A1 (ja) * 2013-04-22 2017-02-23 住友化学株式会社 偏光板の製造方法
US20160333234A1 (en) * 2014-01-30 2016-11-17 Zeon Corporation Laminate and polarizing plate
JP6495374B2 (ja) * 2016-05-30 2019-04-03 住友化学株式会社 画像表示装置用の偏光板、画像表示装置及び画像表示装置用の偏光板の製造方法
WO2018025717A1 (fr) * 2016-08-03 2018-02-08 住友化学株式会社 Film stratifié
WO2020162102A1 (fr) * 2019-02-05 2020-08-13 住友化学株式会社 Corps stratifié optique et dispositif d'affichage

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2001166132A (ja) * 1999-12-06 2001-06-22 Sumitomo Chem Co Ltd 光学フィルム
JP2006010912A (ja) * 2004-06-24 2006-01-12 Sumitomo Chemical Co Ltd 位相差板と複合偏光板、それらの製造方法及び液晶表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001166132A (ja) * 1999-12-06 2001-06-22 Sumitomo Chem Co Ltd 光学フィルム
JP2006010912A (ja) * 2004-06-24 2006-01-12 Sumitomo Chemical Co Ltd 位相差板と複合偏光板、それらの製造方法及び液晶表示装置

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