WO2006129568A1 - 電磁波シールド材及びその製造方法 - Google Patents
電磁波シールド材及びその製造方法 Download PDFInfo
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- WO2006129568A1 WO2006129568A1 PCT/JP2006/310559 JP2006310559W WO2006129568A1 WO 2006129568 A1 WO2006129568 A1 WO 2006129568A1 JP 2006310559 W JP2006310559 W JP 2006310559W WO 2006129568 A1 WO2006129568 A1 WO 2006129568A1
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- shielding material
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- resin
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
- H05K9/0096—Shielding materials being light-transmitting, e.g. transparent, translucent for television displays, e.g. plasma display panel
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
- H01J2211/20—Constructional details
- H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
- H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses
- H01J2211/446—Electromagnetic shielding means; Antistatic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
Definitions
- Electromagnetic wave shielding material and manufacturing method thereof are Electromagnetic wave shielding material and manufacturing method thereof.
- the present invention relates to an electromagnetic wave shielding material for shielding electromagnetic waves generated from electric devices such as CRT and PDP, and a method for manufacturing the same.
- the electromagnetic shielding plate is widely used as a front plate attached to the front of the display in order to shield the electromagnetic wave leaking from the front side force of the display unit such as CRT and PDP.
- the electromagnetic wave shield plate used as the front plate is required not to lower the transparency of the display screen of the display.
- an electromagnetic shielding material having both transparency and electromagnetic shielding properties for example, an electromagnetic shielding material having a conductive part formed by screen printing on the surface of a transparent resin substrate using conductive powder and a binder.
- Patent Documents 1 and 2 There are reports of materials (Patent Documents 1 and 2).
- Patent Document 1 Japanese Patent Laid-Open No. 11-26984
- Patent Document 2 Japanese Patent Laid-Open No. 2001-196784
- An object of the present invention is to provide an electromagnetic shielding material having a high electromagnetic shielding effect and excellent transparency and transparency, and a simple and inexpensive method for producing the electromagnetic shielding material.
- the present inventor has at least one kind selected from acid ceramics, non-acid ceramics, and a group force that also has metallic strength as a main component.
- a specific conductive paste is screen-printed with a geometric pattern on the transparent porous layer surface of a transparent resin substrate having a transparent porous layer contained therein, and then baked at a relatively low temperature.
- the present invention provides the following electromagnetic wave shielding material and method for producing the same.
- the transparent resin base material having a transparent porous layer containing at least one selected as a main component.
- a conductive paste containing conductive particles, a node and a solvent is screen-printed on a geometric pattern, and then the printed transparent resin substrate is heat-treated to form the surface of the transparent porous layer.
- a method for producing an electromagnetic shielding material comprising forming a conductive portion of a geometric pattern.
- a method for producing the conductive paste includes a dispersion step of dispersing conductive powder in a dispersion solvent in the presence of a surfactant, a drying step of freeze-drying the dispersion liquid, and generation of the drying step.
- the method for producing an electromagnetic wave shielding material according to the above (1) comprising a paste paste step for producing a conductive paste having a mass ratio of binder Z conductive particles of 0.1 or less by mixing a product with a binder and a solvent.
- the conductive paste also has a group strength consisting of 100 parts by weight of silver particles whose surfaces are coated with silver oxide, a polyester resin, an acrylic resin, a cellulose resin, a urethane resin, and a copolymer resin thereof. 1 to 10 parts by weight of a binder comprising at least one selected as a main component, as well as aromatic hydrocarbons, ketones, glycol ethers, glycol ether ethers.
- the electromagnetic wave shielding material according to (1) or (3) above which is a conductive paste containing 1 to 20 parts by weight of a solvent mainly composed of at least one selected from the group consisting of stealth and terbineol Manufacturing method.
- the transparent porous layer is a group force that also has silica, titer, and alumina forces. It is an aggregate force of fine particles mainly composed of at least one kind, and V has pores between the fine particles.
- the transparent porous layer is composed of gravure coating, offset coating, comma coating, die coating, slit coating, spray coating, plating method, sol-gel method, LB film method, CVD, vapor deposition, sputtering,
- the resin of the transparent resin base material is polyester resin, polycarbonate resin, poly (meth) acrylate resin resin, silicone resin, cyclic polyolefin resin, polyarylate resin, and polyethersulfone.
- An electromagnetic shielding material having a conductive part of a geometric pattern on a transparent resin base material, having a total light transmittance of 72 to 91%, a haze value of 0.5 to 6%, Surface resistance
- a film-like electromagnetic shielding material having a resistance value of 5 ⁇ or less, a geometric pattern line width of a conductive part of about 10 to 30 / ⁇ ⁇ , and an aperture ratio of about 80 to 95%.
- An electromagnetic wave shielding filter for plasma display comprising the electromagnetic wave shielding material according to any one of (13) to (15).
- Acidic ceramics, non-acidic ceramics, and a group force that also has metallic power are selected.
- the transparent resin base material having a transparent porous layer containing at least one kind as a main component A method in which a conductive paste containing conductive particles, a binder and a solvent is screen-printed in a geometric pattern on the surface of the transparent porous layer and then heat-treated to form a conductive portion of the geometric pattern on the surface of the transparent porous layer. .
- an electromagnetic wave shielding material of the present invention at least a specific group of forces selected from an acid ceramic, a non-acid ceramic, and a metal provided on a base material is selected. It is characterized by screen printing on a transparent porous layer containing one kind as a main component, whereby a conductive pattern with almost no broken lines or thick lines can be formed.
- the patterned conductive paste can be baked at a low temperature, whitening and yellowing of the transparent resin base material can be suppressed and transparency can be maintained.
- the hard coat layer suppresses the influence of heat and moisture on the base material, so that higher transparency is maintained.
- the electromagnetic shielding material of the present invention produced by the above production method has almost no wire breakage in the conductive pattern, so that the resistance value is low and high, and the electromagnetic shielding effect is exhibited.
- Thin line thickness can be suppressed, so high aperture ratio (perspective) and transparency are ensured.
- display images such as cathode ray tube (CRT), plasma display panel (PDP), etc. It is particularly useful as an electromagnetic wave shielding filter used for a display with a large surface.
- FIG. 1 is an optical microscope (magnification: X 100) photograph of a grid line of a conductive part in an electromagnetic wave shielding material obtained in Example 1.
- FIG. 2 is an optical microscope (magnification: X 100) photograph of lattice lines of conductive parts in the electromagnetic wave shielding material obtained in Comparative Example 1.
- FIG. 3 is an optical microscope (magnification: X 100) photograph of lattice lines of conductive parts in the electromagnetic wave shielding material obtained in Comparative Example 2.
- FIG. 4 is a diagram illustrating a method for measuring an aperture ratio in a duplex manner.
- FIG. 5A is a cross-sectional view showing an example in which the cross section of the thin line of the conductive pattern is substantially semicircular.
- FIG. 5B is a cross-sectional view showing an example in which a thin wire has a rectangular cross section in a conductive pattern.
- FIG. 6 is a diagram showing an example of a least-squares line in a graph showing the relationship between log viscosity and log shift speed of a conductive paste.
- the method for producing an electromagnetic wave shielding material of the present invention comprises a transparent porous layer containing at least one selected from the group force consisting of an acid ceramic, a non-acid ceramic and a metal as a main component.
- a conductive paste containing conductive particles, a binder and a solvent is screen-printed on the surface of the transparent porous layer of the resin base material in a geometric pattern, and the substrate after printing is heat-treated (baked) to produce the transparent paste.
- a conductive portion having a geometric pattern is formed on the porous layer surface.
- the base resin of the transparent base resin used in the present invention is not particularly limited as long as it is transparent with high heat resistance and can form the transparent porous layer on the base material. .
- polyester resin such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polycarbonate resin; poly (meth) acrylate resin resin; silicone resin; cyclic polyolefin resin; polyarylate resin Examples thereof include polyethersulfone resins.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- polycarbonate resin poly (meth) acrylate resin resin
- silicone resin silicone resin
- cyclic polyolefin resin polyarylate resin
- polyarylate resin examples thereof include polyethersulfone resins.
- polyester resin especially PET or PEN
- cyclic polyolefin resin are preferably employed.
- the transparency in the transparent resin base material is not particularly limited as long as it is of a level that can be used for applications of display units such as PDP and CRT.
- the total light transmittance measured by JIS K7105 is about 85 to 90%, and the haze value measured by JIS K7105 is about 0.1 to 3%.
- a form that can be used for a display unit such as a PDP, a CRT, etc. that is, a film form, a sheet form, a flat form, etc. is adopted.
- Such a form can be produced from the above-mentioned base resin by a known method.
- a film mainly composed of a cyclic olefin-based resin has a small water absorption rate and moisture permeability, and also has various physical properties such as high light transmittance, and is preferable as the transparent resin base material. Is suitable.
- Cyclic olefin-based resin is a general generic name. Specifically, (a) a ring-opened (co) polymer of cyclic olefin is optionally hydrogenated, and (b) cyclic olefin is attached.
- Caro (co) polymer (c) Random copolymer of cyclic olefin and a-olefin (ethylene, propylene, etc.), (d) (a) to (c) above with unsaturated carboxylic acid or its derivative Examples thereof include modified graft modified products.
- the cyclic olefin is not particularly limited, and examples thereof include norbornene, tetracyclododecene, and derivatives thereof (for example, those having a carboxyl group or an ester group).
- additives such as an ultraviolet absorber, an inorganic or organic antiblocking agent, a lubricant, an antistatic agent, and a stabilizer may be added to the cyclic olefin-based resin for a proper purpose.
- the method for obtaining the film from the cyclic olefin-based resin is not particularly limited, and examples thereof include a solution casting method, an extrusion method, and a calendar method.
- Solvents used in the solution casting method include cycloaliphatic compounds such as cyclohexane, cyclohexene, and cyclohexanone (alicyclic hydrocarbons and their derivatives), and aliphatic compounds such as methylisoptylketone. Examples include (aliphatic hydrocarbons and derivatives thereof), and aromatic compounds (aromatic hydrocarbons and derivatives thereof) such as toluene, xylene, and ethylbenzene.
- the transparent resin base material of the present invention includes acid ceramics, non-oxide ceramics, and gold. It has a transparent porous layer containing as a main component at least one selected from the group consisting of genera.
- oxide ceramics simple oxides such as titanium dioxide, alumina, magnesia, beryllia, zirconia, silica, etc .; silica, holsterite, steatite, wollastonite, zircon, mullite, cordierite, spores
- double acid compounds such as aluminum titanate, spinel, apatite, barium titanate, PZT, PLZT, ferrite and lithium niobate.
- Non-oxide ceramics include nitrides such as silicon nitride, sialon, aluminum nitride, boron nitride, titanium nitride; carbides such as silicon carbide, boron carbide, titanium carbide, tungsten carbide; amorphous carbon, graphite, Examples include carbon such as diamond and single crystal sapphire.
- Other examples include borides, sulfides, and kaides.
- Examples of the metal include gold, silver, iron, copper, nickel and the like.
- silica, titanium, and alumina are more preferable, and other components and blends are not particularly limited.
- the method for forming the transparent porous layer on the transparent resin substrate is not particularly limited by either a wet process or a dry process, but a wet process is preferable from the viewpoint of productivity and cost.
- the substrate may be coated (applied) by a known method. Examples of the coating method include gravure coating, offset coating, comma coating, die coating, slit coating, spray coating, plating method, sol-gel method, LB film method and the like, and sol-gel method is particularly preferable. Yes.
- Starting materials for the sol-gel method include, for example, tetraethoxysilane, methyltriethoxysilane, tetrachlorosilane for silica, and aluminum tri- sec- butoxide, aluminum ( ⁇ ) 2,4-pentanedionate for alumina, etc. Can be mentioned.
- the hydrolyzate (reaction intermediate) in which the sol-gel reaction has already progressed may be used as the starting material. Further, if necessary, other components such as resin and surfactant may be added as appropriate.
- the thickness of the transparent porous layer on the transparent resin base material used in the present invention is about 0.05 to 20 ⁇ m, particularly about 0.1 to 5 ⁇ m.
- the transparent porous layer comprises an aggregate (aggregate) of fine particles mainly composed of at least one selected from the group consisting of acid ceramics, non-acid ceramics, and metals. There are pores between the fine particles.
- the average particle diameter of the fine particles is about 10 to: LOOnm, and the pore diameter is about 10 to 100 nm. Since the present invention has such a transparent porous layer, matching with a conductive paste described later is excellent, and a desired pattern can be formed.
- the form of the transparent resin base material having a transparent porous layer is a film shape, a sheet shape, a flat plate shape, or the like.
- the thickness of the transparent resin substrate having a transparent porous layer is usually about 25 to 200 ⁇ m, preferably about 40 to 188 ⁇ m.
- the thickness is usually about 0.5 to 5 mm, preferably about 1 to 3 mm!
- the transparency of a transparent resin base material having a transparent porous layer is generally such that the total light transmittance measured by JIS K7105 is about 85 to 90%, and the haze value measured by JIS K7105 is 0.1 to 3 About%.
- the transparent resin base material used in the present invention may be provided with a hard coat layer on the surface opposite to the transparent porous layer.
- the hard coat layer is not particularly limited as long as a common material is used as long as the transparency is not impaired. Of these, UV curable attalylate resin and sol-gel responsive ceramic film are preferred.
- the main component of the ultraviolet curable acrylate resin is particularly limited as long as it is an ultraviolet curable acrylate having two or more functional groups such as polyester acrylate, urethane acrylate, and epoxy acrylate. It is not a thing.
- polyfunctional attalylates such as modified gly
- a photopolymerization initiator is usually added to the ultraviolet curable attalylate resin.
- 1-hydroxycyclohexylphenol ketone Irgacure 184, Tinoku 'Specialty' Chemicals Co., Ltd.
- 2 hydroxy-1-methyl-1-1-1-phenylpropane 1-on etc.
- the blending ratio of these photopolymerization initiators is preferably 1 to: LO parts by weight with respect to 100 parts by weight of the UV curable attalylate resin.
- the amount is less than 1 part by weight, the polymerization does not start sufficiently.
- the amount exceeds 10 parts by weight, the durability may be lowered in some cases.
- UV curable attalylate resin that may contain a third component (UV absorber, filler, etc.) as long as the transparency thereof is not impaired.
- Starting materials for the sol-gel reaction type ceramic film include, for example, tetraethoxysilane, methyltriethoxysilane, tetrachlorosilane for silica, and aluminum-tributyl secoxide for alumina, aluminum ( ⁇ ) 2, 4 pentane. Zionate etc. are mentioned.
- the above starting materials cause the sol-gel reaction to proceed in the presence of a catalyst and water, but these hydrolysates (reaction intermediates) that have already undergone the Zorgel reaction may also be used as starting materials.
- the method for forming the hard coat layer on the transparent resin substrate is not particularly limited as long as a general coating method is used.
- the electromagnetic shielding material of the present invention has high transparency. It is also possible to prevent scratches during the manufacturing process of the electromagnetic shielding material.
- the conductive paste used in the present invention contains conductive particles, a binder, and a solvent.
- This conductive paste comprises a dispersion step of dispersing conductive powder in a dispersion solvent in the presence of a surfactant, a drying step of freeze-drying the dispersion, and a product of the drying step as a binder and a solvent.
- the binder Z is produced by a method having a paste-making process for producing a conductive paste having a mass ratio of binder Z conductive particles of 0.1 or less.
- a metal powder treated as a general conductor can be used without particular limitation.
- nickel, copper, gold, silver, aluminum, chromium, platinum, palladium, tungsten, molybdenum, etc., and a combination of two or more of these, or a compound of these metals having good conductivity can be given.
- silver particles, silver compound particles, and silver particles whose surfaces are coated with acid silver (hereinafter also referred to as “acid silver-coated silver particles”) are easy to achieve stable conductivity. Also good because of its good thermal conductivity.
- the silver particles used in the present invention pure silver particles, metal particles surface-coated with silver, or a mixture thereof can be used.
- the shape of these silver particles is not particularly limited, and any shape such as a spherical shape, a scale shape, a needle shape, or a dendritic shape can be used.
- the method for producing silver particles is not particularly limited, and may be any method such as a mechanical pulverization method, a reduction method, an electrolysis method, or a gas phase method.
- the metal particles whose surface is coated with silver are obtained by forming a silver coating layer on the surface of particles having a metal force other than silver by a method such as plating.
- As the silver particles spherical silver particles and scaly silver particles composed only of silver are preferable from the viewpoint of conductivity and cost.
- the volume average particle size of conductive particles such as silver particles is preferably 0.05-10 ⁇ m, more preferably about 0.05-5 m.
- As silver particles a combination of two or more types of particles with different volume average particle sizes, or more, is used to improve the packing density of silver, thereby increasing the conductivity.
- the conductivity of the film may be improved.
- silver composite particles used in the present invention powders of silver-containing organic compounds such as silver oxide, silver aliphatic carboxylate, silver alicyclic carboxylate and silver aromatic carboxylate are used. can do.
- these silver compound particles (particulate silver compound), those produced industrially can be used, and those obtained by a reaction of an aqueous solution containing a silver compound may be used.
- the use of silver compound particles having an average particle size of 0.5 m or less is preferable because the speed of the reduction reaction is increased.
- particles produced by the reaction of the silver composite with other compounds such as an aqueous solution of silver nitrate, sodium hydroxide, etc. It can be produced by a method in which an aqueous alkali solution is dropped with stirring and reacted to obtain a silver oxide powder.
- the present invention when silver particles or silver composite particles are used, they are heated even when the decomposition temperature of the binder resin is taken into account when the polymer-type conductive paste is produced. Therefore, it is preferable to use a material capable of setting the firing temperature to 300 ° C. or less.
- a conductive paste using silver particles or silver composite particles having such a low firing temperature for example, sinters a conductor pattern formed on a transparent resin substrate such as a PET film as it is. It becomes possible.
- the more finely conductive particles are dispersed in the conductive paste the lower the heat capacity of the conductive particles and the closer to the firing temperature inherent to the conductive particles.
- the conductive particles take the form of close packing, and immediately after the conductive particles are highly dispersed, the conductivity after sintering becomes better.
- the conductive paste manufactured by the manufacturing method of the present invention can reduce the blending amount of the binder, and the coating film of the conductive particles is thin, so that adjacent particles can be easily formed after firing. Easy to merge. For this reason, when low-temperature firing type silver particles or silver silicate compound particles having a firing temperature of 300 ° C. or less are used as the conductive paste of the present invention, the original low-temperature sinterability can be sufficiently exhibited. Also, a conductive pattern with good conductivity can be obtained after sintering.
- Silver particles having a volume average particle size of 0.05 to 10 ⁇ m can be used as the silver particles having a low firing temperature. Use silver particles with a volume average particle diameter of 0.05 to 5 / ⁇ ⁇ .
- the layer is preferred.
- these highly active silver powders are effectively treated with the surface treatment in the presence of a surfactant in the liquid phase when the silver powder is produced. Therefore, the original characteristics of these silver particles can be fully exhibited.
- the method for producing silver fine particles include a gas evaporation method (Japanese Patent Application Laid-Open No. 3-34211) and a reduction precipitation method using an amine compound for reduction (Japanese Patent Application Laid-Open No. 11 319538).
- the silver particles having a low sintering temperature silver particles having a low crystallinity can be used. If the crystallinity of the silver particles is low, the crystallite size is usually small. Therefore, by reducing the crystallite size, the fusion temperature between the silver particles can be remarkably lowered.
- the crystallite diameter is preferably 20 nm or less, more preferably lOnm or less.
- silver particles whose surface is coated with acid silver can be used as the conductive particles with a low sintering temperature.
- the volume average particle diameter of the acid silver-coated silver particles contained in the conductive paste is 2 m or less, preferably about 200 to 500 nm.
- silver particles coated with silver oxide with a volume average particle size of 2 m or less are used, it is easy to pass through the screen plate mesh and the disconnection and bleeding of fine lines printed on the transparent porous layer are suppressed. At the same time, the reduction of acid silver is preferred at lower temperatures.
- the acid silver-coated silver particles have a shape in which the surface of the silver particles is covered with a stable acid silver film.
- the content of the silver oxide silver coating is about 1 to 50% by weight, preferably about 5 to 30% by weight, based on the total weight of the silver oxide-coated silver particles.
- This silver oxide silver film plays a role of stabilizing the surface of highly active silver fine particles, and suitably suppresses aggregation between silver fine particles in a paste state.
- the silver oxide film can be rapidly reduced by screen printing and firing to form a conductive part having high conductivity.
- Such silver oxide-coated silver particles can be produced using, for example, a method of oxidizing silver particles themselves or a method of mixing separately prepared silver oxide with silver particles, but there is no particular limitation.
- the silver on the particle surface is oxidized to first silver oxide, second silver oxide, and the like.
- the silver oxide layer on the particle surface may be a mixture of acid silver such as primary silver oxide or secondary silver oxide.
- acid silver silver coated silver particles As a result of the reduction reaction, silver oxide on the surface layer becomes silver, and adjacent particles are fused at a low temperature.
- Silver oxide-coated silver particles can be appropriately selected from those having different compositions and shapes according to the reduction reaction conditions; heating temperature, presence / absence of a reducing agent, reducing power of the reducing agent, and the like.
- surfactant used in the production method of the present invention many types of surfactants commonly used, for example, anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants are used.
- a surfactant can be selected and used.
- anionic surfactant examples include alkyl sulfates, polyoxyethylene alkyl sulfate esters, alkyl benzene sulfonates, alkyl naphthalene sulfonates, fatty acid salts, and naphthalene sulfonate formalin condensates. Salts, polycarboxylic acid type polymer surfactants, alkyl succinates, alkane sulfonates, polyoxyalkylene alkyl ether phosphates and salts thereof, polyoxyalkylene alkyl aryl ether phosphates and salts thereof, Etc.
- Nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyalkylene alkyl ethers, polyoxyethylene derivatives, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, glycerin fatty acid esters. , Polyoxyethylene fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkylamines, polyoxyalkylene alkylamines, alkylalkylol amides, and the like.
- cationic surfactants include alkylamine salts and quaternary ammonium salts.
- amphoteric surfactants include anolenoquinobetaine and anolenoquinamine amine.
- alkylamine-based, alkylamine salt-based, and phosphate ester-based surfactants are particularly preferable for use in the present invention.
- Examples of the surfactant used in the present invention include alkylamines and alkylamine salts. Can be suitably used. In particular, it is more effective when silver particles, silver compound particles, or acid silver-coated silver particles are used as the conductive particles. Alkylamine-based nonionic surfactants and alkylamine-salt-based cationic surfactants are effective when used alone, but especially when used in combination, the dispersibility becomes better and the effect is remarkable. It is.
- alkylamine-based surfactant a polyoxyethylenealkylamine-type surfactant is more preferred, and a polyoxyalkylenealkylamine-type surfactant is more preferred. Of these, those having the following chemical structure (1) are more preferred.
- (a and b are each an integer of 1 to 20, and R represents an alkyl or alkylaryl group having 8 to 20 carbon atoms.)
- alkylamine salt surfactants are preferably alkylamine acetates, and more preferably those having the following chemical structure (2).
- R represents an alkyl group having 8 to 20 carbon atoms or an alkylaryl group.
- the alkyl group having 8 to 20 carbon atoms may be a linear alkyl group or a branched alkyl group, for example, an octyl group, a nonyl group, a decyl group, an undecyl group, Examples include dodecyl group, lauryl group, tetradecyl group, myristyl group, hexadecyl group, cetyl group, octadecyl group, stearyl group, and eicosyl group.
- alkylaryl group having 8 to 20 carbon atoms examples include alkyl fur groups such as an octyl phenol group, a nodule phenol group, and a dodecyl phenol group.
- alkyl part of the alkylaryl group may be a straight chain alkyl group or a branched alkyl group.
- the total amount of the surfactant with respect to the conductive particles is used.
- the total amount needs to be appropriately adjusted depending on the type of conductive particles.
- the blending amount for silver particles needs to be adjusted slightly depending on the type of silver particles, but 0.01-3.00 parts by mass is preferred for 100 parts by mass of silver particles. Part is more preferred.
- the total amount of the surfactant is less than 0.01 parts by mass, sufficient dispersibility tends to be obtained.
- the amount exceeds 3.00 parts by mass the surface of the silver particles is thick and coated with a surfactant, making it difficult to obtain contact between the silver particles after drying, and the conductivity of the conductive paste tends to decrease.
- the mixing ratio of the alkylamine salt to the alkylamine salt salt is in the range of 1:20 to 1: 5. preferable.
- phosphate-based surfactants can also be suitably used.
- it is more effective when silver particles, silver compound particles, or silver oxide-coated silver particles are used as the conductive particles.
- the phosphate ester-based surfactant used in the present invention is a surfactant mainly composed of phosphate monoester or phosphate diester.
- the phosphoric acid ester surfactant as the main component is preferably a polyoxyalkylene alkyl ether phosphoric acid ester, and more preferably has a chemical structure represented by the following general formula (3).
- R represents an alkyl group or alkylaryl group having 1 to 20 carbon atoms, n is an integer of 1 to 20, and X is 1 or 2)
- the alkyl group having 1 to 20 carbon atoms may be a linear alkyl group or a branched alkyl group, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, butyl Group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, lauryl group, tetradecyl group, myristyl group, hexadecyl group, Examples include a til group, octadecyl group, stearyl group, and eicosyl group.
- alkylaryl group having 20 or less carbon atoms examples include alkylfuryl groups such as octylphenyl group, nourphehl group, dodecylphenol group and the like.
- the alkyl part of the alkylaryl group may be a straight chain alkyl group or a branched alkyl group! /.
- the carbon number of R is 1 to 10
- n is 1 to 10
- the sum of the carbon number of R and n is 7 to 15.
- the weight average molecular weight of the phosphate ester surfactant is preferably from 100 to 10,000, and more preferably from 150 to 5,000.
- the phosphorous ester surfactant has a phosphorus content (P content) of preferably 0.5% to 10%, particularly preferably 2% to 6%.
- a phosphate ester-based surfactant having an HLB of 10 or more or adding a basic compound to neutralize the acid value.
- the type and blending amount of the phosphate ester surfactant can be appropriately selected depending on the type of conductive particles.
- the amount of the phosphate ester-based surfactant, for example, relative to the silver particles is preferably 0.01 to 3,000 mass repulsive force per 100 mass% of silver particles, preferably 0.05 to 0.50 mass parts. preferable. If the surfactant is less than 0.01 parts by mass, sufficient dispersibility tends to be difficult to obtain. On the other hand, if the amount exceeds 3.00 parts by mass, the surface of the silver particles is thick and covered with a surfactant, making it difficult to obtain contact between the silver particles after drying, and the conductivity of the conductive paste tends to decrease.
- the dispersion solvent (dispersion medium) used for dispersing the conductive particles is a force selected in consideration of the solubility of the surfactant in the solvent.
- Specific examples include water, ethanol, isopropyl alcohol, and the like. Lower alcohols; ethylene alcohol adducts of alkyl alcohols such as ethylene glycol hexyl ether and diethylene glycol butyl ether, and propylene oxide adducts of alkyl alcohols such as propylene glycol propyl ether.
- These solvents are not limited to those listed here, but can be used alone or in admixture of two or more.
- vacuum freeze-drying is used as a drying method performed after the dispersion step. Therefore, a solvent that can be easily frozen is selected from the power of the above-mentioned dispersing solvent. Specifically, a solvent having a freezing point of 40 ° C. or higher is preferable.
- the conductive particles and the surfactant are added to a dispersion solvent (dispersion medium), and the mixture is dispersed in a stirrer or a disperser to form the conductive particles. Is pulverized into fine powder and mixed with a surfactant.
- a dispersion liquid in which silver particles are dispersed in the presence of the surfactant can be obtained.
- the range of the solid content concentration in such a dispersion is preferably from 0.5 to 80%, particularly preferably from 1 to 50%.
- Useable stirrers or dispersers can be appropriately selected from the known stirrers or dispersers described below.
- the aggregated conductive particles When dispersed for 0.5 to 4.0 hours after blending, the aggregated conductive particles are disintegrated into primary particles, and the surfactant reaches the adsorption equilibrium with respect to the surface of the conductive particles.
- the dispersion when a phosphate ester-based surfactant is used, it is preferable that the dispersion has an acidic condition (for example, ⁇ 1 to 3), an alkylamine or alkylamine salt-based interface.
- an activator when used, it is preferable that the dispersion is in an alkaline condition (for example, pH 12 to 14). Thereby, an interfacial electric double layer is generated on the surface of the conductive particles via the surfactant, and dispersion stability is obtained.
- the charge when hydrophilic group partial force ionization is opposite depends on the sign of the surface charge of the conductive particles. It is preferable to select one of the surfactants so that the repulsive force works.
- an alkylamine or alkylamine salt-based surfactant is preferred, and the conductive paste based on this combination is characterized by excellent thixotropy and a large amount.
- phosphate ester-based surfactants are preferred.
- the conductive paste of this combination has excellent dispersibility in the binder. There is a feature. [0058] (Drying process)
- the dispersion solvent is removed by the vacuum freeze-drying method.
- the vacuum freeze-drying method used basically only the solvent for dispersion is sublimated and removed from the dispersion frozen at a low temperature. That is, since the surfactant is not lost by elution into the dispersion solvent, almost all of the surfactant contained in the dispersion remains together with the conductive particles after the treatment.
- the conductive particles Prior to the vacuum freeze-drying method, the conductive particles are dispersed in the dispersion solvent and the surfactant is dissolved in the dispersion.
- the force localized near the surface of the material is not necessarily adsorbed on the conductive particles.
- the solvent for dispersion is sublimated and removed by a vacuum freeze-drying method here, it is highly possible that the surfactant can be removed while adsorbed uniformly on the surface of the conductive particles.
- the conductive particles may aggregate, but the vacuum freeze-drying method effectively suppresses aggregation of the conductive particles. This is an extremely efficient processing method.
- the conductive particles surface-treated (coated) with the surfactant can be obtained in a high yield. It is easy to understand the relationship between the effect of the agent and the amount used, and it is easy to optimize the amount used.
- the molecules of the surfactant are adsorbed on the surface of the conductive particles at the ends on the hydrophilic group side, the ends on the hydrophobic group side face outward with respect to the conductive particles. This improves the affinity with the binder and improves the dispersibility of the surface-treated conductive particles. In addition, the aggregation of the conductive particles can be suppressed, and the conductive particles can be kept dispersed in the primary particles.
- freeze-drying is performed by pre-freezing to 0 ° C or lower at atmospheric pressure, and theoretically the vapor pressure of water at 0 ° C. 4.
- the solvent for dispersion is sublimated and evaporated in vacuum, so that the shrinkage due to drying is slight, and the structure and structure of the conductive particles surface-treated with the surfactant are small. Hard to destroy.
- partial component concentration such as drying accompanied by movement of liquid components is performed. , Excellent with almost no partial component change or deformation.
- the surface-treated conductive particles are mixed with a binder and a solvent. And kneading using a suitable disperser.
- Examples of binders contained in the conductive paste include polyester resin, acrylic resin, butyral resin, polybulal alcohol resin, acetal resin, phenol resin, urea resin, réelleiliajon acetate.
- Examples include cellulose resin, urethane resin, polyacetic acid resin resin, epoxy resin, melamine resin, alkyd resin, nitrocellulose resin, and natural resin.
- the transparent porous layer has good adhesion to the transparent porous layer.
- polyester resin, acrylic resin, cellulose resin, urethane resin and copolymer resins thereof. Etc. are exemplified. Among these, it can also be used as a 1 type, or 2 or more types of mixture.
- the binder may be used in an amount of about 1 to 20 parts by weight, preferably about 3 to about LO weight, with respect to 100 parts by weight of conductive particles such as silver oxide-coated silver particles.
- the solvent (solvent for pasting) contained in the conductive paste is not particularly limited as long as it does not react with conductive particles such as silver oxide-coated silver particles and the binder and can be dispersed well. It is not limited. For example, when prepared as a paste for screen printing, a paste having a relatively high boiling point (for example, a boiling point of about 100 to 300 ° C.) is often selected.
- aromatic hydrocarbons such as toluene and xylene; ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ethylene glycol monoethyl ether; Ethers of glycols such as ethylene glycol monobutino oleate, diethylene glycol dimethyl ether, triethylene glycol monobuteno oleate, propylene glycol monomethino ethenore, tripropylene glycol normal butyl ether; Ethers of glycols such as chinoleate alcoholate, ethylene glycol monomethinoate etherate acetate, diethylene glycol monobutinoate etherate acetate, diethylene glycol monoethyl ether acetate (carbitol acetate), propylene glycol monomethyl ether acetate
- Organic solvents such as esters and terpineol are used. The amount of the pasting solvent used may be about
- a conductive agent such as silver oxide-coated silver particles can be well dispersed in the conductive paste to prevent secondary aggregation.
- the dispersant include a fibrous polymer such as hydroxypropylcellulose, a water-soluble polymer such as polybutylpyrrolidone and polyvinyl alcohol, and an alkylamine, alkylamine salt, and phosphate ester. Although it is used, it is not particularly limited. When a dispersant is used, the amount used may be about 0.1 to 10 parts by weight with respect to 100 parts by weight of conductive particles such as silver oxide-coated silver particles.
- a plasticizer may be added to the conductive paste as necessary.
- the plasticizer include phthalate esters such as di-n-octyl phthalate (DOP) and di-n-butyl phthalate (DBP), adipic acid esters, phosphoric acid esters, trimellitic acid esters, Forces in which citrate esters, epoxies, polyesters, and the like are used There is no particular limitation as long as the optimum one is selected according to the type of noinder used. When a plasticizer is used, the amount used may be about 0.1 to 10 parts by weight with respect to 100 parts by weight of the binder.
- a simple dispersion treatment such as stirring is performed by adding a solvent and a binder when used. Only a conductive paste can be obtained. That is, by adding a solvent for dispersion and a binder immediately before printing and performing a simple stirring operation, a good conductive paste can be obtained. Therefore, the paste adjusting equipment associated with the printing apparatus may be simple. Moreover, in order to carry out dispersion more reliably, the following dispersion means may be used for dispersion processing.
- Dispersing means that can be used include, for example, two rolls, three rolls, a ball mill, a sand mill, a pebble mill, a tron mill, a sand grinder, a seg barrier striker, a high speed inverter disperser, a high speed stone mill, It can be kneaded and dispersed by a high-speed impact mill, an ender, a homogenizer, an ultrasonic disperser or the like.
- the conductive paste prepared as described above is adjusted to a viscosity and thixotropy suitable for screen printing, and is subjected to screen printing.
- the adjustment of the viscosity and thixotropy can be appropriately selected according to the particle size of conductive particles such as acid silver-coated silver particles, the kind of the solder, the kind of the solvent, and the like. For example, if the viscosity of the conductive paste is usually about 10 to 10,000 dPa's, a good thixotropy index may be appropriately selected in the range of about 0.1 to 1.5.
- the definition of the thixotropy index here is that the log shear rate (lZs) in the graph with the log viscosity (Pa's) on the vertical axis and the log shear rate (lZs) on the horizontal axis is in the range of 1-2. Is the slope of the least square line.
- the thixotropy index is obtained as 0.7823.
- the acid silver on the particle surface is reduced to silver as the paste is cured by heat treatment during sintering.
- the oxygen released by this reduction reaction oxidizes surrounding organic substances such as surfactants and binders, and can generate local heat around the particles.
- the conductive paste using silver oxide-coated silver particles can be fused by a heat treatment at a lower temperature (eg, 200 ° C. or less) than when pure silver particles are used. Therefore, the conductive paste using silver oxide-coated silver particles can reduce the requirement for the heat resistance of the base material during coating or printing, and is particularly suitable for printing on a resin substrate. It is.
- the electromagnetic wave shielding material of the present invention is produced by subjecting the above conductive paste to screen printing on the transparent porous layer surface of a transparent resin base material, followed by heat treatment.
- a specific conductive paste is screen-printed on a predetermined transparent porous layer. This makes it possible to form a pattern conductive portion with almost no disconnection or bleeding of fine lines.
- the screen printing method can be carried out using a known method without any particular limitation.
- the screen plate used for printing is a pattern that can effectively shield electromagnetic waves and has a conductive part that can secure sufficient transparency, especially a continuous geometric pattern such as a grid or mesh. What has is used.
- a screen plate with a grid pattern with a line width of about 10-30 ⁇ m and a pattern pitch of about 200-400 ⁇ m on a 360-700 mesh stainless steel woven with stainless steel wire with a diameter of 11-23 m Is mentioned.
- the line width of a screen-printed pattern tends to be a little thicker in principle than the line width of a screen plate, but there is almost no distortion of the pattern if the line spacing is shifted. A pattern almost faithful to the pattern will be reproduced on the transparent porous layer. If you do not like the tendency to be a little thicker, you can easily set the slit width of the screen plate to be smaller than the desired line width formed in the transparent porous layer. it can.
- the screen-printed electromagnetic shielding material is heat-treated (fired) at a low temperature of about 130 to 200 ° C (particularly about 160 to 180 ° C) to form a lattice pattern on the transparent porous layer.
- the conductive part of is formed.
- an external heating method steam or electric heating hot air, infrared heater, heat roll, etc.
- an internal heating method induction heating, high-frequency heating, resistance heating, etc.
- the heating time is usually about 5 minutes to 120 minutes, preferably about 10 minutes to 40 minutes.
- the heat treatment may be performed in multiple stages. For example, after heat treatment at 50-60 ° C for about 10-20 minutes as the first step, continue to 160-180 ° C as the second step It is also possible to heat it for about 10 to 40 minutes. By using multiple stages, bleeding can be further suppressed by volatilizing the solvent first.
- a silver coating film can be formed at a low temperature and in a short time, so that it is possible to avoid an adverse effect on the transparent resin base material due to heat. That is, it is possible to suppress the substrate from being whitened due to oligomer precipitation of the transparent resin base material due to heat, or the base material from being yellowed due to heat.
- the electromagnetic wave shielding material of the present invention is manufactured as described above.
- the electromagnetic shielding material of the present invention has a high aperture ratio, for example, 75% or more, particularly about 80 to 95%. Therefore, high transparency is achieved.
- the line width (W) of the grid-like or mesh-like pattern of the conductive portion is usually about 10 to 30 ⁇ m, preferably about 15 to 20 m. Geometric patterns with a line width of less than about 10 m tend to be difficult to produce, and over 30 m is preferred because the pattern tends to be noticeable.
- the line spacing (pitch) (P) of the grid-like or mesh-like pattern to be printed can be appropriately selected as long as the aperture ratio and the line width are satisfied. Usually, if it is in the range of 200-400 m.
- the thickness of the fine wire (the maximum height of the fine wire in the vertical direction from the transparent porous layer surface) may vary depending on the line width and the like, but is usually about 1 ⁇ m or more, particularly about 1 to 30 m.
- the cross-section of the fine line on the transparent porous layer formed by screen printing has a substantially semicircular shape.
- the cross section of the thin wire of the present invention is substantially semicircular, the adhesiveness is high when the adhesive layer or the like is bonded, and bubbles do not easily remain. Therefore, electromagnetics with excellent transparency Obtaining a wave shield material has many advantages (see Fig. 5A).
- the electromagnetic shielding material of the present invention has a high electromagnetic shielding effect and is excellent in transparency and transparency. In addition, there is a feature that the resistance is low because there is almost no disconnection of the thin wire of the conductive portion.
- the surface resistance value of the electromagnetic wave shielding material of the present invention is 5 ⁇ or less, preferably 3 ⁇ or less, and more preferably 2 ⁇ or less. If the surface resistance is too large, it is preferable in terms of shielding characteristics.
- the surface resistance value of the shield material having the conductive pattern can be designed by arbitrarily setting the line width and pitch of the pattern from the following equation.
- R Rs X (P / W)
- R Surface resistance value of shield material having conductive pattern ( ⁇ / D)
- W Line width of grid or mesh pattern
- the total light transmittance (JIS K7105) of the electromagnetic wave shielding material of the present invention can achieve a high value of about 72 to 91%.
- the haze value (JIS K7105) is as low as about 0.5 to 6%.
- the conductive pattern formed on the transparent porous layer substantially has a silver particle force, and becomes a lump of high purity silver in which the silver particles are directly fused and bonded. For this reason, the electromagnetic wave shielding material of the present invention has a lower and stable resistance value.
- a protective film may be laminated on the conductive portion formed on the transparent porous layer.
- a commonly used known fat is used as the protective film. Laminate these resins by a known method such as dry lamination or wet lamination.
- the electromagnetic wave shielding material of the present invention may be further laminated with a functional film or the like.
- the functional film includes an antireflection film provided with an antireflection layer for preventing light reflection on the film surface, a colored film colored with coloring or additives, and absorbing near infrared rays.
- an antireflection film provided with an antireflection layer for preventing light reflection on the film surface
- a colored film colored with coloring or additives for preventing light reflection on the film surface
- a colored film colored with coloring or additives for absorbing near infrared rays.
- Examples include a near-infrared shielding film that collects or reflects, and an antifouling film that prevents contaminants such as fingerprints from adhering to the surface.
- the electromagnetic wave shielding material of the present invention is excellent in transparency and transparency with a high electromagnetic wave shielding effect. Further, in the manufacturing method using the screen printing method of the present invention, a homogeneous conductive geometric pattern can be easily provided on a substrate with high accuracy. Therefore, even an electromagnetic wave shield front plate applied to a display with a large display area can be easily manufactured. Therefore, it is useful as an electromagnetic wave shielding filter used for a display having a large display screen such as a plasma display panel (PDP) in addition to a cathode ray tube (CRT).
- PDP plasma display panel
- CRT cathode ray tube
- This silver particle dispersion (a-1) was transferred to a flat tray having a bottom dimension of 200 mmL x 150 mmW, 1 OOg, pre-lyophilized, and then freeze-dried.
- the freeze-drying machine used was “DFM-05AS” manufactured by Nippon Vacuum Co., Ltd.
- Pre-frozen silver particle dispersion (a-1) is placed on a shelf that has been pre-cooled to about 40 ° C, vacuum degree 7 ⁇ : 20 hours freezing and vacuum drying at LOPa, then bulky sponge-like
- 50 g of a surface-treated silver particle (b-1) coated with a surfactant was obtained.
- a silver particle dispersion (a-2) was obtained in the same manner as in Production Example 1 except that 5 g of a 10% by weight aqueous solution of a phosphate ester surfactant having 1750 and HLB of 12 was used.
- 50 g of a silver particle surface treated product (b-2) was obtained by the same method as in Production Example 1 for the silver particle dispersion (a-2) force.
- a conductive paste (c 2) of Production Example 2 was obtained from this silver particle surface treated product (b-2) by the same method as Production Example 1.
- a UV-cured attalate hard coat agent (Dainippon Paint Co., Ltd., trade name “UV Clear” solid content concentration 50% by weight) is cured.
- a hard coat layer was formed by irradiating ultraviolet rays at an irradiation dose of 300 mjZcm 2 .
- the conductive paste (c 1) of Production Example 1 [surface treated with 10% silver oxide and alkyla Using a silver-based silver (average particle size 400 nm) treated with a mineral-based Z alkylamine salt surfactant, polyester urethane-based binder and carbitol acetate solvent] It was.
- the screen plate is a 500 mesh stainless steel woven with 18 ⁇ m diameter stainless steel wire, with a grid emulsion pattern with a line width of 20 m, pattern pitch of 250 m, and aperture ratio of 84.6%.
- a plate manufactured by Nakanuma Art Screen
- the silver composite paste with the film was baked at 180 ° C. for 30 minutes to form a conductive part having a square pattern drawn in a grid, and an electromagnetic shielding material was produced.
- a 125 m-thick polyethylene terephthalate film (trade name “A4300” manufactured by Toyobo Co., Ltd.) was used as the transparent resin base material, and a sol solution (organosiloxane-based sol in which silica fine particles were dispersed on the surface of the film. (Silica filler with a particle size of 10 to 100 nm added to the solution) is cured so that the film thickness after curing is 1.0 m, dried at 120 ° C for 1 minute, then 3 at 60 ° C.
- a polyethylene terephthalate film transparent substrate having a transparent porous layer (layer thickness: 1. ⁇ m) of a silica membrane was produced by aging for days.
- a sol-gel reaction type hard coating agent manufactured by Nippon Seiki Co., Ltd., trade names “NSC2451 (main agent)”, “NSC-CO (curing)” Agent) ”... reverse gravure coating of 1.83 parts of curing agent to 100 parts of the main agent so that the film thickness after curing is 3 / zm, and hardened by drying at 120 ° C. for 2 minutes. A coat layer was formed.
- the screen plate is a 400-mesh stainless steel woven with 23 ⁇ m diameter stainless steel wire with a grid emulsion pattern with a line width of 20 m, a pattern pitch of 300 m, and an aperture ratio of 87.1%.
- a plate manufactured by Nakanuma Art Screen was used.
- the silver composite paste with the film was baked at 170 ° C. for 30 minutes to form a conductive portion having a square pattern drawn in a lattice shape, and an electromagnetic shielding material was produced.
- a 100 m thick cyclic polyolefin film (trade name “TOPAS6017” manufactured by Polyplastitas Co., Ltd.) is used.
- a dispersed sol solution organosiloxane-based sol solution with a silica filter with a particle size of 10 to 100 nm added) is formed so that the film thickness after curing is 1. O / zm, 120 ° C After drying for 1 minute at 60 ° C. for 3 days, an annular polyolefin film transparent substrate having a transparent porous layer (layer thickness 1. O / zm) of a silica membrane was produced.
- a sol-gel reaction type hard coating agent manufactured by Nippon Seiki Co., Ltd., trade names “NSC2451 (main agent)”, “NSC-CO (curing)” Agent) ”... reverse gravure coating of 1.83 parts of curing agent to 100 parts of the main agent so that the film thickness after curing is 3 / zm, and hardened by drying at 120 ° C. for 2 minutes. A coat layer was formed.
- the conductive paste (c 1) [surface treated with 10% silver oxide and alkylamine-based Z Lattice pattern screen printing was performed using alkylamine salt-based surfactant-treated particulate silver (average particle size 400 nm), polyester urethane-based binder and carbitol acetate solvent] .
- the screen plate is a 400 mesh stainless steel woven with 23 ⁇ m diameter stainless steel wire with a grid emulsion pattern with a line width of 20 m, a pattern pitch of 300 m and an aperture ratio of 87.1%.
- a plate manufactured by Nakanuma Art Screen was used.
- the silver composite paste with the film was baked at 170 ° C. for 30 minutes to form a conductive portion having a square pattern drawn in a lattice shape, and an electromagnetic shielding material was produced.
- a polyethylene terephthalate film (trade name “A4100”, manufactured by Toyobo Co., Ltd.) with a thickness of 175 / zm that does not have a transparent porous layer is used.
- Apply a hard coating agent (Dainippon Paint Co., Ltd., trade name “UV clear” solid concentration 50% by weight) with a Meyer bar so that the film thickness after curing is 2 m, and then for 2 minutes at 80 ° C.
- an electromagnetic wave shielding material was produced in the same manner as in Example 1 except that a hard coat layer was formed by irradiating ultraviolet rays at an irradiation amount of 300 mjZcm 2 . Screen printing was performed on the opposite side of the film having no hard coat layer.
- Example 1 instead of the conductive paste (c-l) used in Example 1 [containing 10% acid-silver silver-treated particulate silver, polyester urethane binder and carbitol acetate solvent]
- General silver paste [SW-1100-1 manufactured by Asahi Institute of Science, component ratio: silver particles (particle size 3-5 111) 58.0-64.0%, carbon powder (primary particles 0.1 m Below) 0.8 to 1.2%, polyester resin 11.0 to 14.0%, additive 0.05 to 0.15%, ethyl carbitol acetate (remaining amount), viscosity 200 to 300ps (
- An electromagnetic shielding material was produced in the same manner as in Example 1 except that Piscotester VT-04 type) was used. When the grid lines of the conductive part of the obtained electromagnetic wave shielding material were observed with an optical microscope (magnification: X100), many disconnections and blurring of lines occurred (Fig. 3).
- UV-curing acrylated hard on its surface Apply a coating agent (made by Dainippon Paint Co., Ltd., trade name “UV clear” solid content 50% by weight) with a Mayer bar so that the film thickness after curing is 2 m, and then at 80 ° C for 2 minutes. After drying, a hard coat layer was formed by irradiating ultraviolet rays at an irradiation dose of 300 mjZcm 2 .
- the conductive paste (c 1) [surface treated with 10% silver oxide and alkylamine system]
- Lattice-pattern screen printing was performed using Z-alkylamine salt surfactant-treated particulate silver (average particle size 400 ⁇ m), polyester urethane binder and carbitol acetate solvent] .
- the screen version is a screen in which a 400-mesh stainless steel basket woven with stainless steel wire with a diameter of 23 ⁇ m is provided with a grid-like emulsion pattern with a line width of 20 m, a pattern pitch of 300 m, and an aperture ratio of 87.1%.
- a plate manufactured by Nakanuma Art Screen was used.
- the silver composite paste with the film was baked at 170 ° C. for 30 minutes to form a conductive portion having a square pattern drawn in a lattice shape, and an electromagnetic shielding material was produced.
- the electromagnetic shielding effect was measured with a measuring device according to the Kansai Electronics Industry Promotion Center method (generally called the KEC method).
- the total light transmittance was measured with a turbidimeter NDH-20D type (manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS K7105.
- the haze value was measured with a turbidimeter NDH-20D type (manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS K7105.
- the sheet resistance was measured using Loresta EP (manufactured by Diainsuno Rememb).
- the line width was measured using an optical microscope.
- Aperture ratio (%) (area BZ area A) X 100 (%)
- the line thickness was measured using a surface roughness meter.
- the degree of adhesion was evaluated using a tape peeling test method. Specifically, when a commercially available cellophane tape (manufactured by Chiban, Cellotape (registered trademark) CT-18, LP-18) is affixed to the electromagnetic wave shielding material, 90% or more of the mesh pattern remains. “ ⁇ ” indicates that it is present, “ ⁇ ” indicates that it is 50% or more but less than 90%, and “X” indicates that it is less than 50%. [0117] [Table 1]
- the electromagnetic wave shielding material obtained in the present invention has a high electromagnetic shielding effect and excellent transparency and transparency.
- the electromagnetic shielding material of the present invention shields electromagnetic waves generated from electric devices such as CRT and PDP, and can be used to shield electromagnetic waves in various fields.
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Abstract
Description
Claims
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KR1020077028082A KR100932150B1 (ko) | 2005-06-03 | 2006-05-26 | 전자파 쉴드재 및 그 제조 방법 |
US11/916,209 US8067702B2 (en) | 2005-06-03 | 2006-05-26 | Electromagnetic wave shielding material and production process of the same |
EP06746888.4A EP1895828B1 (en) | 2005-06-03 | 2006-05-26 | Electromagnetic shielding material and method for producing same |
CN2006800189657A CN101185385B (zh) | 2005-06-03 | 2006-05-26 | 电磁波屏蔽材料及其制造方法 |
JP2007518947A JP4519914B2 (ja) | 2005-06-03 | 2006-05-26 | 電磁波シールド材及びその製造方法 |
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EP (1) | EP1895828B1 (ja) |
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JP2009016570A (ja) * | 2007-07-04 | 2009-01-22 | Dainippon Printing Co Ltd | 透明性を有する電磁波シールド部材の製造方法 |
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JP2009135480A (ja) * | 2007-11-06 | 2009-06-18 | Furukawa Electric Co Ltd:The | 電磁波遮蔽用配線回路の形成方法及び電磁波遮蔽用シート |
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WO2010101028A1 (ja) * | 2009-03-02 | 2010-09-10 | 東レ株式会社 | 網目状金属微粒子積層フィルム及びその製造方法 |
JP2011192755A (ja) * | 2010-03-12 | 2011-09-29 | Gunze Ltd | 透明導電性シート、その製造に用いる導電性ペーストの製造法、電磁波シールド材およびタッチセンサー |
JP2015008263A (ja) * | 2013-05-27 | 2015-01-15 | 日東電工株式会社 | 軟磁性樹脂組成物、軟磁性接着フィルム、軟磁性フィルム積層回路基板、および、位置検出装置 |
JP2020042259A (ja) * | 2018-09-05 | 2020-03-19 | 大日本印刷株式会社 | 表示装置 |
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Also Published As
Publication number | Publication date |
---|---|
US8067702B2 (en) | 2011-11-29 |
EP1895828B1 (en) | 2013-06-26 |
US20100018765A1 (en) | 2010-01-28 |
CN101185385A (zh) | 2008-05-21 |
KR20080005598A (ko) | 2008-01-14 |
JP4519914B2 (ja) | 2010-08-04 |
CN101185385B (zh) | 2010-06-16 |
JPWO2006129568A1 (ja) | 2009-01-08 |
KR100932150B1 (ko) | 2009-12-16 |
EP1895828A1 (en) | 2008-03-05 |
EP1895828A4 (en) | 2010-12-22 |
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