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WO2005089958A1 - PROCéDé POUR LA PRODUCTION D’UNE FEUILLE ENDUITE, D’UNE COUCHE DE FONCTION OPTIQUE, D’UN FILM OPTIQUE ET D’UN APPAREIL D’AFFICHAGE D’IMAGE - Google Patents

PROCéDé POUR LA PRODUCTION D’UNE FEUILLE ENDUITE, D’UNE COUCHE DE FONCTION OPTIQUE, D’UN FILM OPTIQUE ET D’UN APPAREIL D’AFFICHAGE D’IMAGE Download PDF

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Publication number
WO2005089958A1
WO2005089958A1 PCT/JP2005/004777 JP2005004777W WO2005089958A1 WO 2005089958 A1 WO2005089958 A1 WO 2005089958A1 JP 2005004777 W JP2005004777 W JP 2005004777W WO 2005089958 A1 WO2005089958 A1 WO 2005089958A1
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Prior art keywords
film
coating
optical
coating liquid
layer
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PCT/JP2005/004777
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English (en)
Japanese (ja)
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WO2005089958A8 (fr
Inventor
Ryuuichi Inoue
Mie Oota
Makoto Komatsubara
Kazuki Tsuchimoto
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Nitto Denko Corp
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Nitto Denko Corp
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Publication of WO2005089958A8 publication Critical patent/WO2005089958A8/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings

Definitions

  • the present invention relates to a method for producing a coating sheet for producing a display material and an optical functional layer produced by the method, and is useful for an optical film and an image display device using the same.
  • an image display device such as a liquid crystal display device is equipped with a lot of various optical films having an optical functional layer, and various kinds of coating sheets are used for such optical films.
  • a general method for producing a coating film on these coated sheets is to apply a coating liquid to a support using a coating device such as a gravure coater, a roll coater, a blade coater, or a die coater, and then dry the coating liquid.
  • a coating device such as a gravure coater, a roll coater, a blade coater, or a die coater
  • a method of forming a coating film is adopted (for example, see Patent Document 1).
  • Patent Document 1 JP-A-62-140672
  • the optical function layer is formed of a thin film in accordance with the enhancement of the optical function, and if the thickness of the thin film is uneven, the display function of an image display device such as a liquid crystal display device using the thin film is used. Lower. Therefore, while it is required that the optical functional layer has a uniform thickness, it has been difficult to form a coating layer with a uniform thickness. In particular, it was even more difficult to form a coating layer with a uniform film thickness on a large-area substrate film.
  • An object of the present invention is to eliminate streak-like defects generated at the center of a coating film, and to stably produce a coating film with a small thickness variation particularly for a large-area substrate film.
  • An object of the present invention is to provide a method of manufacturing a sheet, an optical functional layer produced by the method, an optical film and an image display device using the same.
  • the present inventors have conducted intensive studies on a method for producing a coated sheet, and found that the above-mentioned object can be achieved by the following method, and have completed the present invention.
  • the present invention is a method for producing a coating sheet for forming a coating film, comprising a step of applying a coating liquid on a surface of a support using a die, wherein a pipe for introducing the coating liquid to the die is provided.
  • the Reynolds number (Re number) within is 25 or less. Where the Re number is
  • the present inventors have found that in order to perform uniform coating on a support using a die, in addition to uniformly supplying a coating liquid in a width direction, a supply liquid of the coating liquid is supplied.
  • the Re number which is the ratio of the inertial force to the viscous force of the fluid, to 25 or less
  • the inertial force in the coating liquid discharge direction is moderated, and generated at the center of the coating film (coating). It has been found that it is possible to suppress the occurrence of streak-like defects, which have been very difficult to predict in the past.
  • uniform coating can be performed. Therefore, it is possible to provide a method for producing an excellent coating sheet, an optical functional layer produced by the method, an optical film and an image display device using the same, by eliminating streak-like defects generated at the center of the coating film. It has become possible.
  • the pressure of the coating liquid introduced into the die at the supply port is preferably in the range of 0.5 to 5 kPa.
  • the present inventor has proposed a coating method at a supply port for introducing a coating liquid into a die. It has been found that by setting the pressure of the working liquid within a predetermined range, it is possible to prevent liquid shortage and coating unevenness. It is very effective when performing coating, and it is possible to stably produce a coated sheet with a small thickness variation.
  • the uniformity of the coating liquid supply in the die width direction and the supply direction, and further in the film thickness direction is improved. Significant improvement can be achieved, and uniform coating can be performed on the support.For large area base films that are greatly affected by uniformity in the width direction, relatively simple indicators should be managed. As a result, excellent characteristics can be secured.
  • the viscosity of the coating liquid is in the range of 11 lOmPa's. In order to properly control the Re number and the pressure of the coating liquid, it is necessary that the viscosity of the coating liquid be within such an appropriate range, and to ensure the optimal fluidity of the coating liquid. A uniform coating film can be formed.
  • a step of drying the liquid to be coated is included after the step of applying the coating liquid to the surface of the support.
  • a step of drying the liquid to be coated is included after the step of applying the coating liquid to the surface of the support.
  • the thickness of the dried film is in the range of 11 to 20 ⁇ m.
  • the thickness of the coating film after drying is within a predetermined range.
  • the present invention provides an optical functional layer comprising a coating formed by applying a coating liquid to a surface of a support using a die, wherein a Reynolds number (Re) in a pipe for introducing the coating liquid into the die is provided. (Number) is 25 or less.
  • Re Reynolds number
  • Number 25 or less.
  • the Re number is represented by the following equation 1.
  • the coated article produced by the method for producing a coated sheet of the present invention can provide a thin and uniform coating layer. Therefore, it is useful when producing an optical functional layer that requires uniformity of the optical functional characteristics in the plane.
  • the optical functional layer is an optical compensation layer.
  • the optical functional layer produced by the method described above is particularly useful when forming an optical compensation layer that requires in-plane uniformity. This can eliminate poor orientation and obtain an optical film as designed.
  • the present invention is an optical film having at least one optical functional layer composed of a coating formed by applying a coating liquid on a surface of a support using a die, wherein the optical functional layer is applied to the die. It is characterized by being formed with the Reynolds number (Re number) in the pipe into which the working fluid is introduced to 25 or less.
  • Re number is represented by the following equation 1.
  • An optical film having excellent optical functional characteristics can be obtained by having an optical functional layer having an extremely thin layer and excellent uniformity as described above.
  • the present invention is an image display device including an optical functional layer composed of a coating formed by applying a coating liquid on a surface of a support using a die, wherein the optical functional layer is provided on the die. It is characterized in that it is formed with the Reynolds number (Re number) in the pipe for introducing the liquid being 25 or less.
  • Re number is represented by the following equation 1.
  • the present invention relates to an image display device equipped with an optical film, wherein the optical film has at least one optical functional layer composed of a coating formed by applying a coating liquid on a surface of a support using a die.
  • the optical functional layer is formed such that the Reynolds number (Re number) in a pipe for introducing a coating liquid into the die is 25 or less.
  • the Re number is expressed by the following equation (1).
  • an image display device without unevenness or distortion of an image can be realized.
  • the number of Re in the pipe for introducing the coating liquid into the die is set to a predetermined value or less, thereby eliminating streak-like defects at the center of the coating film and coating the supply port.
  • the pressure of the working fluid within the specified range, the variation in film thickness could be suppressed to 10% or less.
  • the optical compensation layer and the optical film using the coated product have excellent optical functional characteristics.
  • the image display device can provide an excellent display without unevenness or distortion of an image.
  • FIG. 1 is an explanatory view illustrating the configuration of a coating apparatus according to the present invention.
  • FIG. 2 is an explanatory view illustrating details of a configuration of a coating apparatus according to the present invention.
  • a step of applying a coating liquid on a support for example, a step of applying a coating liquid on a support.
  • a coating method including (1) and a drying step (2) of a coating liquid applied on a support is used.
  • the coating method in the coating step (1) of the present invention uses a closed system in the production of a coated sheet used for an optical film or the like, as described above, because the coating liquid is liable to be deteriorated and foreign substances are not mixed therein.
  • the die coating method which can perform coating and is excellent in uniformly supplying the coating liquid in the width direction of the coating film, is preferable.
  • the drying method in the drying step (2) is not particularly limited, and ordinary heating means can be adopted.
  • a hot air blower, an electric heater, an IR heater and the like can be mentioned.
  • the drying temperature is in the range of about 20-150 ° C, preferably 20-130 ° C.
  • the drying time is about 10-300 seconds, preferably 30-180 seconds.
  • FIG. 1 is an example of a conceptual diagram of a coating apparatus according to the present invention.
  • the coating liquid is applied to the support 2 transported by the transport roller 1 while being held by the knock roll 4 using the die 3, and then the drying liquid 5 is transferred to the drying means 5.
  • the drying unit 5 include an apparatus that is divided into an initial drying step, a first heat drying step, and a second heat drying step.
  • the initial drying step is performed at room temperature, and a heating means is provided in the first and second heat drying steps.
  • the drying temperature and the drying time in the first heat drying step and the second heat drying step are adjusted according to the type of the coating liquid.
  • a film sheet having a film layer (film) formed on the support 2 is wound on a winding roll 6.
  • the coating layer of the coating sheet can be protected by a separately fed protective sheet (not shown).
  • a curing treatment such as heat curing or UV curing can be further performed depending on the type of the coating liquid.
  • the coating layer thus obtained can be used without peeling from the support 2, or can be used after peeling from the support 2.
  • FIG. 2 is an explanatory view exemplifying the details of the configuration of a coating apparatus that is useful for the present invention, specifically, a die 3 and a path for supplying a coating liquid to the die.
  • the die 3 is provided with a coating liquid distributor 7 in order to supply the coating liquid uniformly in the width direction, and the coating liquid supplied from the pipe 9 is supplied through the pressure gauge 8 to the distributor 7. To the support. At this time, the Re number of the coating liquid in the pipe 9 is controlled, and the pressure of the coating liquid is controlled based on the output of the pressure gauge 8.
  • the dispensing section 7 is provided with a coat nonger type 'fish table' depending on the physical properties of the coating liquid 'application conditions, etc. Although it is manufactured in various shapes such as a single-type (straight mar-holder (T-mer)) type, according to the present invention, a type in which the coating liquid is supplied from the center in the width direction of the die is preferably used.
  • the shape of the distribution unit is optimally designed using flow analysis, but the flow velocity distribution in the width direction can be made uniform depending on the physical properties and application conditions of the actual coating liquid.
  • the diameter of the supply liquid supply pipe for the coating liquid was increased, and the Re number, which is the ratio of the inertial force to the viscous force of the fluid, was set to 25 or less. It has been found that the inertial force in the direction can be reduced and the occurrence of the defect can be suppressed.
  • the Re number is 5-20, more preferably 10-20.
  • the film thickness variation was suppressed by setting the pressure of the coating liquid at the supply port within the range of 0.5 to 5 kPa. In particular, 0.7-1.5 kPa is more preferable.
  • the viscosity of the coating liquid is in the range of 11 lOmPa's. In particular, 3-7 mPa's is more preferable.
  • Different force due to other conditions of the coating liquid If the force is smaller than ImPa's, the fluidity of the coating liquid will be high and the manufacturing process will be immediately affected by disturbances (wind, temperature, etc.) The above control may be difficult, and if it exceeds lOmPa's, the fluidity of the coating liquid may deteriorate, and it may be difficult to form a uniform coating film.
  • the viscosity of the coating liquid is in a range that can ensure such optimal fluidity.
  • the viscosity used here is based on the value measured at a temperature of 25 ° C and a shear rate of 0.1-10000 [lZs] using a viscosity measuring device manufactured by Haake: Rheostress RS1.
  • any layer may be used as long as the layer is made of a material having a certain degree of wettability with respect to the coating liquid.
  • the transparent base film and various glass plates, photoresists and the like can be used.
  • the optical functional layer is formed using a coating liquid
  • a transparent substrate film as a support.
  • the transparent base film include transparent polymers such as polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; cellulose polymers such as diacetyl cellulose and triacetyl cellulose; polycarbonate polymers; and acrylic polymers such as polymethyl methacrylate. Films that are powerful.
  • Styrene polymers such as polystyrene and acrylonitrile styrene copolymer; polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure; olefin polymers such as ethylene propylene copolymer; butyl chloride polymers; nylon and aromatic
  • a film having a transparent polymer such as an amide-based polymer such as polyamide may also be used.
  • imide polymers sulfone polymers, polyethersulfone polymers, polyetherenoate enoleketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, arylate polymers,
  • a film having a transparent polymer such as a polyoxymethylene-based polymer, an epoxy-based polymer or a blend of the above-mentioned polymers is also included. In particular, those having low optical birefringence are preferably used.
  • a polymer film described in JP-A-2001-343529 for example, (A) a thermoplastic resin having a substituted or Z or non-amide group in a side chain; A resin composition containing a thermoplastic resin having a substituted and Z-unsubstituted file and a -tolyl group in the chain is mentioned.
  • a resin composition film containing an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer is exemplified.
  • a film such as a mixed extruded resin composition can be used.
  • the thickness of the support may be determined as appropriate, but is generally about 10 to 500 m from the workability such as strength and handleability, and the thickness of the thin layer '14. Particularly, 20-300 m force S is preferable, and 30-200 / z m is more preferable.
  • the coating liquid used in the present invention may be any as long as it can form a coating film.
  • a coating film forming material and a solvent of the coating liquid are selected according to the function of a target coating layer. You.
  • Examples of the coating layer that can be formed by the coating method include an optical functional layer, an antistatic layer, a surface protective layer, a conductive functional layer, a pressure-sensitive adhesive layer, an adhesive layer, and a transparent coat layer.
  • the formation of the coating by the coating liquid can be performed by sequentially forming the coating on the support. Therefore, a support on which a coating film has been formed in advance can be used.
  • Solvents used in the coating liquid include aromatic solvents such as benzene, toluene, xylene, methoxybenzene, and 1,2-dimethoxybenzene; ester solvents such as ethyl acetate and butyl acetate; methanol, ethanol, Alcohol solvents such as isopropanol, tert-butyl alcohol, glycerin, ethylene glycol and triethylene glycol; phenol solvents such as phenol and parachlorophenol; ketone solvents such as acetone, methyl ethyl ketone and cyclohexanone; dimethyl Amide solvents such as formamide, dimethylacetamide and dimethyl sulfoxide; ether solvents such as tetrahydrofuran; Lucersolve, cellosolve-based solvents; chloroform-based solvents such as chloroform, dichloromethane, dichloroethane, tetrachloroethane,
  • the concentration of the non-volatile components in the coating liquid is not particularly limited, but is usually 0.5 to 50% by weight, preferably 1 to 40% by weight.
  • the coating liquid may contain various additives depending on the application of the coating layer formed by the coating liquid.
  • the thickness of the dried coating film is 11 It is preferable to be within the range.
  • the thickness of the coating film after drying is smaller than 1 ⁇ m, it is difficult to secure each function of the coating film required for the present invention, and when it exceeds 20 m, the coating is applied in the thickness direction of the coating layer. Liquid concentration distribution and convection occur, and the uniformity of the coating layer tends to be lost.
  • the coating method of the present invention comprises a coating layer It is suitable for the case where the dry thickness is 110 m.
  • the thickness of the coating film it is possible to more effectively improve the thickness accuracy of the coating film and make the optical function characteristics uniform. it can.
  • the coating product produced by the above-described method for producing a coated sheet can be a thin layer and a uniform coating layer (coated film) can be obtained.
  • Such coatings are useful for producing optical functional layers that require uniformity in the optical function characteristics, and eliminate poor appearance of the coated surface due to thickness differences and poor alignment of the liquid crystal layer.
  • an optical functional layer as designed can be obtained. That is, the present invention relates to an optical functional layer comprising a coating layer formed by a production method including a step of applying a coating liquid on the surface of a support and a step of drying a liquid to be coated. It is characterized by being produced by.
  • optical functional layer examples include an optical compensation layer, a hard coat layer, an antireflection layer, and a retardation layer. These can be used as those having at least one optical functional layer or as an optical film. It is particularly suitable when the coating layer is an optical compensation layer, and is provided on a support and used as an optical compensation plate.
  • the optical film of the present invention is characterized in that at least one optical functional layer is provided.
  • at least one optical functional layer is provided.
  • a polymerizable liquid crystal monomer and Z or a liquid crystal polymer are used for forming the optical compensation layer.
  • the polymerizable liquid crystal monomer include a nematic liquid crystal monomer.
  • the composition contains a polymerizable liquid crystal monomer, it usually contains a photopolymerization initiator.
  • photopolymerization initiators can be used without particular limitation. The same applies to the formation of the retardation layer.
  • nematic liquid crystalline monomer examples include those having a polymerizable functional group such as an atalyloyl group or a methacryloyl group at a terminal and a mesogen group having a cyclic unit equivalent force. Further, by using a compound having two or more atalyloyl groups, meta-atalyloyl groups, or the like as a polymerizable functional group, a crosslinked structure can be introduced to improve durability.
  • Examples of the above-mentioned cyclic unit to be a mesogen group include biphenyl, phenylbenzoate, phenolic hexane, azoxybenzene, azomethine, azobenzene, and phenylenopyrimidimidiene. And diphenylacetylene, diphenylbenzoate, bicyclohexane, cyclohexylbenzene, terphenyl and the like.
  • the terminal of these cyclic units may have a substituent such as, for example, a cyano group, an alkyl group, an alkoxy group, or a halogen group.
  • a condensation type polymer having a structure in which a mesogen group having an aromatic unit is bonded for example, a polymer of a polyester type, a polyamide type, a polycarbonate type, a polyester imide type or the like is used.
  • the aromatic unit serving as a mesogen group include a phenolic unit, a biphenyl-based unit, and a naphthalene-based unit. These aromatic units are substituted with a cyano group, an alkyl group, an alkoxy group, a halogen group, or the like. It may have a group.
  • Examples of the side chain type liquid crystal polymer include those having a main chain of a polyatalylate type, a polymethacrylate type, a polysiloxane type, or a polymalonate type as a skeleton, and having a mesogen group including a cyclic unit in the side chain.
  • Examples of the cyclic unit to be a mesogen group include biphenyl, phenylbenzoate, phenylcyclohexane, azoxybenzene, azomethine, azobenzene, phenylpyrimidine, and diphenylacetylene.
  • Dipheno-norenbenzoate bicyclohexane, cyclohexynolebenzene, terfenolene and the like.
  • the terminals of these cyclic units may have a substituent such as a cyano group, an alkyl group, an alkoxy group, a halogen group or the like.
  • the mesogenic groups of the polymerizable liquid crystal monomer and the liquid crystal polymer may be bonded to each other via a spacer that imparts flexibility.
  • the spacer portion include a polymethylene chain and a polyoxymethylene chain.
  • the number of repeating structural units forming the spacer portion is appropriately determined depending on the chemical structure of the mesogen portion, but the repeating unit of the polymethylene chain is 0 to 20, preferably 2 to 12, and the number of repeating polyoxymethylene chains.
  • the unit is 0-10, preferably 1-3.
  • a cholesteric liquid crystal monomer or a chiral agent can be blended with the nematic liquid crystal monomer or liquid crystal polymer so as to exhibit a cholesteric phase in a liquid crystal state. Further, a cholesteric liquid crystalline polymer can be used. The obtained cholesteric liquid crystal phase is used as a selective reflection film.
  • chiral agents optically active groups
  • the material is not particularly limited as long as the material has such a property as not to disturb the alignment of the nematic liquid crystal monomer and the like.
  • the chiral agent may or may not have liquid crystallinity, but those exhibiting cholesteric liquid crystallinity can be preferably used.
  • the chiral agent can be used either with or without a reactive group.
  • a cholesteric liquid crystal alignment film obtained by curing is preferably a compound having a reactive group in terms of heat resistance and solvent resistance.
  • the reactive group include an atalyloyl group, a metaariloyl group, an azido group, and an epoxy group.
  • an optically anisotropic layer composed of a tilted alignment layer of a discotic liquid crystal is used as an optical compensation retardation phase.
  • the discotic liquid crystal include those described in JP-A-8-94836.
  • the liquid crystal monomer and the liquid crystal polymer can be developed on an alignment film.
  • the orientation film various types of conventionally known films can be used.For example, a film formed by forming a thin film such as polyimide or polyvinyl alcohol on a transparent base material and rubbing the thin film is used.
  • a stretched film obtained by stretching a transparent film, a polymer having a cinnamate skeleton and a polymer having a azobenzene skeleton, or a film obtained by irradiating polarized ultraviolet rays to a polyimide or the like can be used.
  • the transparent resin forming the hard coat layer has excellent hard coat properties and shows a hardness of H or more in a pencil hardness test of CFIS K5400), has sufficient strength, and has excellent light transmittance.
  • a thermosetting resin, a thermoplastic resin, an ultraviolet curing resin, an electron beam curing resin, a two-component mixed resin, and the like can be given.
  • an ultraviolet-curable resin that can efficiently form a light-diffusing layer with a simple processing operation by a curing treatment by ultraviolet irradiation is preferable.
  • UV-curable resin examples include polyester-based, acrylic, urethane-based, amide-based, silicone-based, and epoxy-based resins, and include UV-curable monomers, oligomers, and polymers.
  • the UV-curable resin preferably used is, for example, one having an ultraviolet-polymerizable functional group, among which those containing an acrylic monomer or an oligomer component having two or more, particularly three to six, such functional groups are preferred. No.
  • an ultraviolet polymerization initiator is blended with the ultraviolet curable resin.
  • the material for forming the antireflection layer examples include resin materials such as ultraviolet curable acrylic resin, hybrid materials in which inorganic fine particles such as colloidal silica are dispersed in the resin, tetraethoxysilane, and titanium. Sol-gel based materials using metal alkoxides such as tetraethoxide and the like can be mentioned. In addition, a fluorine group-containing compound is used for each material in order to impart antifouling properties to the surface. From the viewpoint of abrasion resistance, a low refractive index layer material having a large content of an inorganic component tends to be excellent, and a sol-gel material is particularly preferred! / ⁇ . The sol-gel material can be used after being partially condensed.
  • the optical film having the optical functional layer formed thereon can be used by peeling the transparent substrate film from the optical functional layer or without peeling. Further, the optical film having the optical functional layer formed thereon can be used in combination with another optical element. Other optical elements can be adhered to either side of the optical functional layer or the transparent substrate film. Another optical element includes a polarizer.
  • the polarizer is not particularly limited, and various types can be used.
  • the polarizer include a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and an ethylene / butyl acetate copolymer-based partially modified film, and iodine and a dichroic dye. And uniaxially stretched by adsorbing the dichroic substance, and a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol or a dehydrochlorination product of polyvinyl chloride.
  • a polybutyl alcohol-based film and a polarizer having a dichroic substance such as iodine are preferable.
  • the thickness of these polarizers is not particularly limited. Generally, the thickness is about 5 to 80 m.
  • a polarizer obtained by dyeing a polyvinyl alcohol-based film with iodine and uniaxially stretching is produced by, for example, dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it to 3 to 7 times its original length. Can be. If necessary, it can be immersed in an aqueous solution of boric acid or potassium iodide. Further, if necessary, the polyvinyl alcohol-based film may be immersed in water and washed with water before dyeing.
  • Rinsing the polyvinyl alcohol-based film with water can remove dirt and anti-blocking agents on the surface of the polyvinyl alcohol-based film, and swelling the polyvinyl alcohol-based film can cause unevenness such as uneven dyeing. Also has the effect of preventing.
  • Stretching may be performed after dyeing with iodine
  • the film may be stretched while being dyed, or may be stretched and dyed with iodine. Stretching can be performed in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • the polarizer is usually provided with a transparent protective film on one or both sides and used as a polarizing plate.
  • the transparent protective film preferably has excellent transparency, mechanical strength, thermal stability, moisture shielding property, isotropy, and the like.
  • the transparent protective film the same material as that of the above-mentioned transparent base film is used.
  • a transparent protective film having the same polymer material strength on both sides may be used, or a transparent protective film having a different polymer material strength may be used. Those excellent in transparency, mechanical strength, heat stability, moisture barrier properties, and the like are preferably used.
  • the transparent protective film has less optical anisotropy such as retardation, and is more preferable in many cases.
  • the polymer forming the transparent protective film triacetyl cellulose is most suitable.
  • the transparent base film can also serve as a transparent protective film of the polarizer.
  • the thickness of the transparent protective film is not particularly limited, but is generally about 10 to 300 m.
  • the transparent protective film is as colored as possible. Therefore,
  • nx is the main refractive index in the film plane
  • nz is the refractive index in the film thickness direction
  • d is the film thickness.
  • a protective film having a retardation value in the film thickness direction of 90 nm- + 75 nm represented by the following formula is preferably used.
  • the thickness direction retardation value (Rth) is more preferably 80 nm- + 6 Onm, and particularly preferably 170 nm- "h45 nm.
  • the polarizer of the transparent protective film may not be adhered!
  • the surface may have been subjected to a hard coat layer / state-king prevention or the intended treatment.
  • the hard coat treatment is performed for the purpose of preventing scratches on the polarizing plate surface and the like. It can be formed by a method of adding to the surface of the light protection film.
  • the anti-stating treatment is performed for the purpose of preventing close contact with an adjacent layer.
  • the hard coat layer, the anti-staking layer and the like can be provided on the transparent protective film itself, or can be provided as an optical layer separately from the transparent protective film.
  • a hard coat layer, a primer layer, an adhesive layer, an adhesive layer, an antistatic layer, a conductive layer, a gas barrier layer, a water vapor barrier layer, a moisture barrier layer, or the like is inserted between the layers of the polarizing plate. It may be laminated on the board surface. Also. In the step of forming each layer of the polarizing plate, for example, the improvement may be performed as necessary by adding, mixing, or the like, conductive particles or an antistatic agent, various fine particles, a plasticizer, and the like to the material forming each layer. .
  • the polarizing plate can be used by laminating other optical elements (optical layers).
  • the optical layer is not particularly limited, but is used for forming a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including a wavelength plate such as 1Z2 or 1Z4), a viewing angle compensation film, and the like.
  • a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including a wavelength plate such as 1Z2 or 1Z4), a viewing angle compensation film, and the like.
  • One or two or more optical layers may be used.
  • a reflective polarizing plate or a transflective polarizing plate in which a reflecting plate or a transflective reflecting plate is further laminated on a polarizing plate an elliptically polarizing plate or a circular polarizing plate in which a retardation plate is further laminated on a polarizing plate, a polarized light
  • a wide viewing angle polarizing plate in which a viewing angle compensation film is further laminated on a plate, or a polarizing plate in which a brightness enhancement film is further laminated on a polarizing plate is preferable.
  • an optical film such as a retardation film or an optical compensation plate obtained in the present invention can be used.
  • the reflective polarizing plate is a polarizing plate provided with a reflective layer, and is used to form a liquid crystal display device of a type that reflects incident light from the viewing side (display side) and displays the reflected light.
  • a built-in light source such as a backlight can be omitted, and the liquid crystal display device can be easily made thin.
  • the reflection-type polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is provided on one side of the polarizing plate via the transparent protective film or the like, if necessary.
  • the transflective polarizing plate can be obtained by forming a transflective reflective layer such as a half mirror that reflects and transmits light with the reflective layer. Transflective polarizing plate
  • liquid crystal display device or the like when the liquid crystal display device or the like is used in a relatively bright atmosphere, the image is displayed by reflecting the incident light from the viewing side (display side), and relatively Depending on the atmosphere, a liquid crystal display device or the like that is built in the back side of a transflective polarizing plate and displays an image using a built-in light source such as a backlight can be formed.
  • a phase difference plate or the like is used.
  • a so-called 1Z4 wavelength plate (also referred to as a ⁇ plate) is used as a phase difference plate for changing linearly polarized light to circularly polarized light or for converting circularly polarized light to linearly polarized light.
  • a 1Z2 wavelength plate (also referred to as ⁇ 2 plate) is usually used to change the polarization direction of linearly polarized light.
  • the elliptically polarizing plate compensates (prevents) coloring (blue or yellow) caused by birefringence of the liquid crystal layer of the super twisted nematic (STN) type liquid crystal display device, and displays the colorless black and white display. It is used effectively in such cases. Further, a device in which a three-dimensional refractive index is controlled is preferable because coloring (coloring) generated when the screen of the liquid crystal display device is viewed from an oblique direction can be compensated (prevented).
  • the circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflection type liquid crystal display device that displays an image in color, and also has an antireflection function.
  • a film having an appropriate polymer strength such as polycarbonate, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polypropylene or other polyolefin, polyarylate, or polyamide is stretched.
  • the retardation plate may have an appropriate retardation in accordance with the intended use, such as, for example, various wavelength plates or ones for the purpose of compensating for coloration and viewing angle due to birefringence of the liquid crystal layer.
  • the optical characteristics such as retardation may be controlled by stacking the above retardation plates.
  • the above-mentioned elliptically polarizing plate or reflection type elliptically polarizing plate is in phase with the polarizing plate or reflection type polarizing plate.
  • the difference plates are laminated in an appropriate combination.
  • a large elliptically polarizing plate or the like can also be formed by sequentially and separately laminating a (reflection type) polarizing plate and a retardation plate in the manufacturing process of a liquid crystal display device so as to form a combination.
  • An optical film such as an elliptically polarizing plate as described above has an advantage that the stability of quality and laminating workability are excellent and the production efficiency of a liquid crystal display device or the like can be improved.
  • the viewing angle compensation film is a film for widening the viewing angle so that an image can be viewed relatively clearly even when the screen of the liquid crystal display device is viewed in a direction not perpendicular to the screen but slightly oblique.
  • a viewing angle compensating retardation plate includes, for example, a retardation film, an alignment film such as a liquid crystal polymer, and a transparent substrate on which an alignment layer such as a liquid crystal polymer is supported.
  • a common retardation plate is a birefringent polymer film uniaxially stretched in the plane direction, whereas a retardation plate used as a viewing angle compensation film is biaxially stretched in the plane direction.
  • Birefringent polymer film biaxially stretched uniaxially stretched polymer film or bidirectionally stretched film such as a birefringent polymer with a controlled refractive index in the thickness direction and a tilted oriented film
  • the obliquely oriented film include a film obtained by bonding a heat shrinkable film to a polymer film and subjecting the polymer film to a stretching treatment or a Z-shrinkage treatment under the action of its shrinkage by heating, or a film obtained by obliquely orienting a liquid crystal polymer. And the like.
  • the raw material polymer for the retardation plate the same polymer as that described for the retardation plate is used, which prevents coloring etc. due to changes in the viewing angle based on the retardation of the liquid crystal cell and enlarges the viewing angle for good visibility. Appropriate ones for the purpose can be used.
  • a triacetyl cellulose film supports an alignment layer of a liquid crystal polymer, in particular, an optically anisotropic layer composed of a tilted alignment layer of a discotic liquid crystal polymer, for achieving a wide viewing angle with good visibility.
  • An optically-compensated phase difference plate can be preferably used.
  • the polarizing plate obtained by laminating the polarizing plate and the brightness enhancement film is usually used by being provided on the back side of a liquid crystal cell.
  • Brightness-enhancing films exhibit the property of reflecting linearly polarized light with a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light enters due to reflection from the backlight or the back side of a liquid crystal display device, etc., and transmitting other light.
  • the polarizing plate, in which the brightness enhancement film is laminated with the polarizing plate is irradiated with light from a light source, such as a backlight, and has a predetermined polarization state. The transmitted light is obtained, and light other than the predetermined polarization state is reflected without being transmitted.
  • the light reflected on the surface of the brightness enhancement film is further inverted through a reflection layer or the like provided on the rear side thereof and re-entered on the brightness enhancement film, and a part or all of the light is transmitted as light of a predetermined polarization state.
  • the brightness can be improved. is there.
  • the above-mentioned brightness improving film for example, such as a multilayer thin film of a dielectric or a multilayer laminate of thin films having different refractive index anisotropies, linear light having a predetermined polarization axis is transmitted and other light is transmitted. Reflects either left-handed or right-handed circularly polarized light, and transmits other light, such as those exhibiting reflective characteristics, such as an alignment film of cholesteric liquid crystal polymer and an alignment liquid crystal layer supported on a film substrate. Any suitable material such as one exhibiting the characteristic described above can be used.
  • Lamination of other optical elements on the optical film obtained in the present invention can also be performed by a method of sequentially and separately laminating in the process of manufacturing a liquid crystal display device or the like.
  • This method has the advantage that the stability of quality and the assembling work are excellent and the manufacturing process of a liquid crystal display device or the like can be improved.
  • Appropriate bonding means such as an adhesive layer can be used for lamination.
  • their optical axes can be set at an appropriate angle depending on the intended retardation characteristics and the like.
  • the optical film obtained by the present invention may be provided with an adhesive layer for bonding to another member such as a liquid crystal cell.
  • the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer is not particularly limited, and for example, a material having a base polymer of, for example, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, or a fluorine-based or rubber-based polymer is appropriately used. Can be selected and used. In particular, those having excellent optical transparency, such as an acrylic pressure-sensitive adhesive, exhibiting appropriate wettability, cohesiveness and adhesive pressure-sensitive adhesive properties, and having excellent weather resistance and heat resistance can be preferably used.
  • a liquid crystal display device that prevents foaming and peeling phenomena due to moisture absorption, prevents optical characteristics from deteriorating due to a difference in thermal expansion and prevents warpage of a liquid crystal cell, and thus is a high quality and excellent in durability.
  • an adhesive layer having a low moisture absorption rate and excellent heat resistance is preferred.
  • the adhesive layer is made of, for example, a natural or synthetic resin, especially a tackifying resin or glass fiber. It may contain fillers such as fibers, glass beads, metal powders, and other inorganic powders, and additives that are added to the adhesive layer, such as pigments, colorants, and antioxidants. Further, an adhesive layer or the like which contains fine particles and exhibits light diffusibility may be used.
  • the attachment of the adhesive layer to the optical film may be performed by an appropriate method.
  • an adhesive solution of about 10 to 40% by weight is prepared by dissolving or dispersing a base polymer or a composition thereof in a solvent capable of being used alone or as a mixture of appropriate solvents such as toluene and ethyl acetate. Then, it is directly attached on the optical element by an appropriate developing method such as a casting method or a coating method, or an adhesive layer is formed on a separator and transferred onto the optical element according to the method described above.
  • the pressure-sensitive adhesive layer may be provided as a superposed layer of different compositions or types in each layer.
  • the thickness of the pressure-sensitive adhesive layer can be appropriately determined depending on the purpose of use, adhesive strength, and the like. In general, the thickness is 1-1500 m, preferably 5-200 m, and particularly preferably 10-100 m.
  • the exposed surface of the adhesive layer is covered with a temporary router for the purpose of preventing contamination and the like until practical use. This can prevent the adhesive layer from coming into contact with the adhesive layer in a normal handling state.
  • a suitable thin leaf such as plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foam sheet, metal foil, or a laminate thereof may be used as the separator.
  • An appropriate material according to the related art such as one coated with an appropriate release agent such as a molybdenum sulfide or a long-chain alkyl-based or fluorine-based molybdenum sulfide, may be used.
  • the polarizer, the transparent protective film, the optical layer, and the like, which form the above-mentioned optical element, and the respective layers such as the adhesive layer are provided with, for example, a salicylate compound or a benzophenol compound.
  • a benzotriazole-based compound, a cyanoacrylate-based compound, a nickel complex salt-based compound, or the like may have an ultraviolet absorbing ability by a method such as a method of treating with an ultraviolet absorbing agent.
  • the optical film of the present invention and a film obtained by laminating another optical element on the optical film can be preferably used for forming various devices such as a liquid crystal display device.
  • the formation of the liquid crystal display device can be performed according to the conventional method. That is, a liquid crystal display device generally includes a liquid crystal cell, an optical film, and a laminate of other optical elements, an optical element, and an illumination system as necessary. It is formed by appropriately assembling components such as a stem and incorporating a drive circuit.
  • the optical film according to the present invention is used.
  • the liquid crystal cell any type such as TN type, STN type and ⁇ type can be used.
  • An appropriate liquid crystal display device such as a liquid crystal display device in which the optical element is arranged on one or both sides of a liquid crystal cell, or a lighting system using a backlight or a reflector can be formed.
  • the optical element according to the present invention can be provided on one side or both sides of the liquid crystal cell.
  • optical elements When optical elements are provided on both sides, they may be the same or different.
  • a suitable component such as a diffusion plate, an anti-glare layer, an antireflection film, a protection plate, a prism array, a lens array sheet, a light diffusion plate, a knock light, etc.
  • two or more layers can be arranged.
  • organic electroluminescence device organic EL display device
  • a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially stacked on a transparent substrate to form a light emitting body (organic electroluminescent light emitting body).
  • the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer of a fluorescent organic solid force such as anthracene, or A structure having various combinations such as a laminate of such a light-emitting layer and an electron injection layer having a perylene derivative or a hole injection layer, a light-emitting layer, and an electron injection layer. Is known.
  • an organic EL display device including an organic electroluminescent luminous body having a transparent electrode on the front side of an organic luminescent layer that emits light by applying a voltage and a metal electrode on the back side of the organic luminescent layer,
  • a polarizing plate can be provided on the surface side of the electrode, and a retardation plate can be provided between the transparent electrode and the polarizing plate.
  • the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode. Therefore, the polarizing function has an effect that a mirror surface of the metal electrode is not visually recognized from the outside. is there.
  • the retardation plate is composed of a 1Z4 wavelength plate and the angle between the polarization directions of the polarizing plate and the retardation plate is adjusted to ⁇ ⁇ 4, the mirror surface of the metal electrode will be completely shielded. You can do it.
  • the appearance was evaluated by observing under a three-wavelength fluorescent lamp and visually checking for the presence of streak-like defects.
  • the thickness of the dried film was measured at a pitch of 50 mm from the end in the width direction (width 1100 mm) using an optical interference thickness gauge (MCPD2000, manufactured by Otsuka Electronics Co., Ltd.). From these values, the average thickness and its variation were determined. The variation was determined by the following equation.
  • the flow velocity in the pipe was determined by the following equation.
  • the density of the coating liquid was determined at 25 ° C. using a density hydrometer: DA-50 manufactured by Kyoto Electronics Industry Co., Ltd.
  • One of the PET supports was coated using a coating apparatus as shown in FIGS. 1 and 2 described above.
  • As the coating liquid a mixed solution of acrylic UV-curable liquid crystal monomer (manufactured by BASF, trade name LC-242, wet thickness: 13 m) and cyclopentanone is used, and the thickness after drying is 4 ⁇ m.
  • the coating amount and the drying temperature were set so as to obtain a coating film, and the coating speed was adjusted to about lOmZmin to obtain a coating film.
  • Tables 1 and 2 show the conditions (Re number, pressure, etc.) in each coating step of the examples and comparative examples.
  • Tables 1 and 2 show the results of Example 13, Comparative Examples 1 and 2, and Reference Examples 1 and 2.
  • the film thickness variation could be suppressed to 10% or less by setting the pressure of the coating liquid at the supply port within the range of 0.5 to 5 kPa.

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  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Un procédé de production d’une feuille enduite dans laquelle, en résolvant les défauts striés survenant sur le centre de la couche protectrice, une couche protectrice dont la fluctuation de l’épaisseur du film est réduite peut-être produite notamment sur un matériau support de film de grande surface ; une couche de fonction optique produite par le processus ; et un film optique et appareil d’affichage d’image utilisant le même processus. Est fourni un processus caractérisé par le fait que le nombre Re dans la canalisation d’introduction d’un liquide de revêtement dans une matrice est £ 25. En outre, le processus est caractérisé par le fait que la pression sur le port d’alimentation d’un liquide de revêtement pour l’introduire dans une matrice est compris dans la gamme de 0,5 à 5 kPa. Il est préférable que la viscosité du liquide de revêtement soit comprise dans la gamme de 1 à 10 mPa·s. Il est aussi préférable que l’étape d’application d’un liquide de revêtement sur la surface d’un support soit suivie d’une étape de séchage du liquide de revêtement appliqué et que l’épaisseur du film de revêtement après séchage soit comprise dans la gamme de 1 à 20 μm.
PCT/JP2005/004777 2004-03-22 2005-03-17 PROCéDé POUR LA PRODUCTION D’UNE FEUILLE ENDUITE, D’UNE COUCHE DE FONCTION OPTIQUE, D’UN FILM OPTIQUE ET D’UN APPAREIL D’AFFICHAGE D’IMAGE Ceased WO2005089958A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013205509A (ja) * 2012-03-27 2013-10-07 Dainippon Printing Co Ltd 光学シート、これを備えた表示装置、および光学シートの製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04271016A (ja) * 1989-12-06 1992-09-28 Fuji Photo Film Co Ltd 多層磁気記録媒体の製造方法
JPH09248509A (ja) * 1996-03-14 1997-09-22 Lintec Corp 塗布装置および方法
JP2003026000A (ja) * 2001-07-12 2003-01-29 Nippon Cable Syst Inc ケーブル式のステアリング伝導装置
JP2003340352A (ja) * 2002-05-29 2003-12-02 Canon Inc 枚葉塗工方法及びカラーフィルタの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04271016A (ja) * 1989-12-06 1992-09-28 Fuji Photo Film Co Ltd 多層磁気記録媒体の製造方法
JPH09248509A (ja) * 1996-03-14 1997-09-22 Lintec Corp 塗布装置および方法
JP2003026000A (ja) * 2001-07-12 2003-01-29 Nippon Cable Syst Inc ケーブル式のステアリング伝導装置
JP2003340352A (ja) * 2002-05-29 2003-12-02 Canon Inc 枚葉塗工方法及びカラーフィルタの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013205509A (ja) * 2012-03-27 2013-10-07 Dainippon Printing Co Ltd 光学シート、これを備えた表示装置、および光学シートの製造方法

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