WO2008013199A1 - Fine particle dispersion and method for producing fine particle dispersion - Google Patents
Fine particle dispersion and method for producing fine particle dispersion Download PDFInfo
- Publication number
- WO2008013199A1 WO2008013199A1 PCT/JP2007/064577 JP2007064577W WO2008013199A1 WO 2008013199 A1 WO2008013199 A1 WO 2008013199A1 JP 2007064577 W JP2007064577 W JP 2007064577W WO 2008013199 A1 WO2008013199 A1 WO 2008013199A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- organic solvent
- fine particles
- fine particle
- particle dispersion
- volume
- Prior art date
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- 239000010419 fine particle Substances 0.000 title claims abstract description 279
- 239000006185 dispersion Substances 0.000 title claims abstract description 116
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 239000003960 organic solvent Substances 0.000 claims abstract description 323
- 239000002270 dispersing agent Substances 0.000 claims abstract description 119
- 229920000642 polymer Polymers 0.000 claims abstract description 116
- 239000002184 metal Substances 0.000 claims abstract description 110
- 229910052751 metal Inorganic materials 0.000 claims abstract description 109
- 238000009835 boiling Methods 0.000 claims abstract description 53
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- 150000002739 metals Chemical class 0.000 claims abstract description 45
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 38
- 239000000956 alloy Substances 0.000 claims abstract description 38
- 239000011164 primary particle Substances 0.000 claims abstract description 35
- 150000002736 metal compounds Chemical class 0.000 claims abstract description 30
- 125000003368 amide group Chemical group 0.000 claims abstract description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 18
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 15
- -1 honolemamide Chemical compound 0.000 claims description 71
- 239000002245 particle Substances 0.000 claims description 42
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- 229910052802 copper Inorganic materials 0.000 claims description 40
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 38
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
- H05K1/097—Inks comprising nanoparticles and specially adapted for being sintered at low temperature
Definitions
- Fine particle dispersion and method for producing fine particle dispersion Fine particle dispersion and method for producing fine particle dispersion
- the present invention relates to a fine particle dispersion excellent in dispersibility, storage stability, etc., in which fine particles comprising one or more of a metal, an alloy, and a metal compound are dispersed in a specific mixed organic solvent, And a method for producing a fine particle dispersion.
- fine metal particles with a particle size of 1 am or less made of industrial general-purpose metals such as copper, nickel, cobalt, iron, zinc, tin, silver, and alloys thereof are conductive circuits, bumps, vias, pads, etc. It is highly expected as a material for mounting parts, high density magnetic storage media, magnetic elements for antennas, gas improvement filters, and catalyst materials for fuel cell electrodes.
- the gas phase synthesis method is a method of forming solid metal fine particles from metal vapor introduced into the gas phase, while the liquid phase synthesis method is to reduce metal ions dispersed in a solution. This is a method for precipitating metal fine particles
- a method using a reducing agent for reducing the metal ion and a method of electrochemical reduction on a force sword electrode are generally known.
- an ink containing metal fine particles is used as an ink for an ink jet, it is important to maintain dispersibility in the ink for a long period of time. For this reason, a method for producing fine metal particles that maintains dispersibility in ink for a long period of time has been proposed.
- Patent Document 1 as a method for obtaining copper fine particles, palladium ion for nucleation is added, and polyethyleneimine is added as a dispersing agent to contain palladium in a polyethylene glycol or ethylene glycol solution. The following copper fine particles are formed, and then, using this copper fine particle dispersion, pattern printing is performed on the substrate, and heat treatment is performed at 250 ° C. for 3 hours in a 4% HN airflow, thereby conducting fine copper conduction.
- Forming a film is disclosed.
- Patent Document 2 an ink jet ink containing metal oxide fine particles having a primary particle size of lOOnm or less is applied onto a substrate by an ink jet method, and then is applied in a hydrogen gas atmosphere.
- Patent Document 3 metal nanoparticles having an organometallic compound attached as a dispersant around a metal are applied onto a substrate (glass) by spin coating, dried at 100 ° C, and dried at 250 ° C. It is disclosed that a silver thin film is produced by firing.
- Patent Document 4 copper acetate with an average secondary particle size of 500 nm suspended in diethylene glycol is concentrated to a concentration of 30% by weight, and further subjected to ultrasonic treatment to provide conductivity. It is disclosed that after forming an ink, it is applied onto a slide glass and heated in a reducing atmosphere at 350 ° C. for 1 hour to obtain a copper thin film.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-330552
- Patent Document 2 JP 2004-277627 A
- Patent Document 3 Japanese Patent Laid-Open No. 2005-81501
- Patent Document 4 JP 2004 323568 A Disclosure of the invention
- Patent Document 3 and Patent Document 4 an organometallic compound is attached as a dispersant around the metal particles, or a relatively high temperature of about 350 ° C is used. There was a problem that a conductive metal member could not be obtained unless it was performed in a reducing gas atmosphere such as hydrogen gas at the time of heat treatment or at the time of heat treatment.
- the present inventors have at least a part of the surface covered with a polymer dispersant! / When dispersing fine particles such as metals in an organic solvent, an amide group is formed.
- a mixed organic solvent containing an organic solvent and a specific other organic solvent is used, it is excellent in dispersibility and long-term storage stability, and the fine particle dispersion is placed on a substrate and dried and fired to form a metal thin film, a metal fine wire It is found that the obtained metal thin film, metal thin wire, etc. have excellent electrical conductivity and substrate adhesion, without requiring a reducing gas atmosphere when obtaining The present invention has been completed.
- the present invention relates to (1) one or more of metals, alloys, and metal compounds, and primary particles having an average particle size of 1 to 150 nm (P) having at least a part of the surface thereof.
- the weight ratio (D / P) of the agent (D) to the fine particles (P) is 0.00;! To 10, and the mixed organic solvent is
- At least an organic solvent having an amide group (A) 50 to 95% by volume, an alcohol having a boiling point exceeding 100 ° C at normal pressure, and having 1 or 2 or more hydroxyl groups in the molecule and / or many Organic solvent composed of monohydric alcohol (C) Mixed organic solvent containing 5-50% by volume (S 2)
- a fine particle dispersion characterized by the above (hereinafter sometimes referred to as a first embodiment).
- the "fine particle dispersion" according to the first aspect may further have the following aspects (2) to (7).
- the organic solvent (A) is N methylacetamide, N methylformamide, N methylpropanamide, honolemamide, N, N dimethylacetamide, 1, 3 dimethylolene imidazolidinone, N, N dimethylformamide, One or more selected from 1-methyl 2-pyrrolidone, hexamethinole phosphoric triamide, 2-pyrrolidinone, ⁇ -force prolatatam, and acetamide.
- the general formula Ri OR ⁇ R 1 R 2 is independently an alkyl group and has 1 to 4 carbon atoms.
- An ether compound (B1) represented by the general formula R 3 —OH (wherein R 3 is an alkyl group and has 1 to 4 carbon atoms), and an alcohol (B 2), R 4 -C ( 0) -R 5 R 5 is each independently an alkyl group and has 1 to 2 carbon atoms.
- Alcohol (B 2) that is one or more selected from methanol, ethanol, 1 propanol, 2-propanol, 2-butanol, and 2-methyl 2-propanol,
- an amine compound (B4) which is triethylamine and / or jetylamine.
- the organic solvent (C) is ethylene glycol, diethylene glycol, 1,2 propanediol, 1,3 propanediol, 1,2 butanediol, 1,3 butanediol, 1,4 butanediol, 2— Butene 1,4-diol, 2,3-butanediol, pentanediol, hexanediole, octanediole, glyceronole, 1,1,1 tris-hydroxymethylethane, 2-ethyl-2-hydroxymethyl-1,3-propanediol 1, 2, 6-hexanetrinore, 1, 2, 3-hexanetrinore, 1, 2, 4-fu, 'Tant Rio Monore, Trait Monore, erythritol, pentaerythritol, pentitol, and One or more selected from hexitol.
- the polymer dispersant (D) is one selected from polybulurpyrrolidone, polyethyleneimine, polyacrylic acid, carboxymethylcellulose, polyacrylamide, polybulal alcohol, polyethylene oxide, starch, and gelatin. Or two or more.
- the metal is selected from copper, silver, gold, nickel, cobalt, iron, zinc, tin, aluminum, bismuth, platinum, rhodium, palladium, ruthenium, manganese, chromium, vanadium, and titanium.
- an alloy in which the alloy is composed of two or more of the metals, and the metal compound are oxides of the metal and the alloy.
- the present invention provides (8) fine particles (P) having an average primary particle size of 1 to 150 nm composed of one or more of metals, alloys, and metal compounds at least on the surface thereof. A part of which is covered with a polymer dispersant (D) and dispersed in a mixed organic solvent! /
- the weight ratio (D / P) of the polymer dispersant (D) to the fine particles (P) covering the surface of the fine particles (P) in the dispersion is 0.001 to 10; and at least Fine particles (P) whose surface is partially covered with a polymer dispersant (D)
- a method for producing a fine particle dispersion characterized by being dispersed in (hereinafter, sometimes referred to as a second embodiment).
- At least one kind of metal ion and the polymer dispersant (D) are dissolved! /,
- the metal ion is reduced by electrolytic reduction or electroless reduction using a reducing agent in an aqueous solution.
- the organic solvent (A) is N-methylacetamide, N-methylformamide, N-methylpropanamide, honolemamide, N, N-dimethylacetamide, 1,3-dimethyl-2-imidazolide
- N, N-dimethylformamide, 1-methyl-2-pyrrolidone, hexamethyphosphoric triamide, 2-pyrrolidinone, ⁇ -force prolatatum, and acetoamide One or more selected from force.
- the organic solvent (8) has the general formula R 1 —OR 2 R 2 is each independently an alkyl group and has 1 to 4 carbon atoms.
- An ether compound (B1) represented by the general formula R 3 —OH (R 3 is an alkyl group and has 1 to 4 carbon atoms) (B 2), R 4 -C ( 0)
- R 5 R 4 and R 5 are each independently an alkyl group having 1 to 2 carbon atoms
- the organic solvent (B) is jetyl ether, methylpropyl ether, dipropyl ether, diisopropyl ether, methyl-t-butyl ether, t-aminolemethyl etherol, dibule ether, ethylbutyl ether, and aryl ether.
- An ether compound (B1) that is one or more selected from the group consisting of
- Alcohol (B 2) that is one or more selected from methanol, ethanol, 1 propanol, 2-propanol, 2-butanol, and 2-methyl 2-propanol,
- One or more ketone compounds (B3) selected from acetone, methyl ethyl ketone, and jetyl ketone;
- an amine compound (B4) which is triethylamine and / or jetylamine.
- the organic solvent (C) is ethylene glycol, diethylene glycol, 1,2 propandiol, 1,3 propanediol, 1,2 butanediol, 1,3 butanediol, 1,4 butanediol, 2 butene 1,4-diol, 2,3 butanediole, pentanediol, hexanediole, octanediol, glyceronorole, 1,1,1-trishydroxymethylethane, 2ethyl-2-hydroxymethyl-1,3 propanediol 1 Norre, 1, 2, 6 Hexatriol Nore, 1, 2, 3 Hexatriol Nore, 1, 2, 4h, Tantrio Norre, Trait Norre, Erytritornole, Pentaerythritol, Pentithonore, and One or more selected from hexitol.
- the polymer dispersant (D) is polybulurpyrrolidone, polyethyleneimine, polyatari One or more selected from among phosphoric acid, carboxymethylcellulose, polyacrylamide, polybutyl alcohol, polyethylene oxide, starch, and gelatin
- the metal is selected from copper, silver, gold, nickel, cobalt, iron, zinc, tin, aluminum, bismuth, platinum, rhodium, palladium, ruthenium, manganese, chromium, vanadium, and titanium.
- One or two or more kinds, an alloy in which the alloy is composed of two or more kinds of the metals, and the metal compound are oxides of the metals and alloys.
- the fine particle dispersion of the present invention uses the mixed organic solvent (S 1), the mixed organic solvent (S2) or the mixed organic solvent (S3) as a mixed organic solvent for dispersing the fine particles (P).
- the dispersing action of the high molecular dispersant (D) and the dispersing action of these mixed organic solvents act synergistically, and are excellent in dispersibility and long-term storage stability.
- a reducing gas atmosphere is unnecessary and firing is possible at a relatively low temperature.
- the obtained metal thin film, fine metal wire, etc. have excellent conductivity and substrate adhesion.
- fine particles of the present invention are referred to as “fine particles (P)”, the metals, alloys and metal compounds constituting the fine particles (P) as “metals”, and the organic solvent (A) having an amide group as “ ⁇ Organic solvent (A) '' and a low boiling point organic solvent (B) having a boiling point of 20 to 100 ° C. at normal pressure are referred to as ⁇ Organic solvent (B) '' and a boiling point at normal pressure of over 100 ° C.
- An organic solvent (C) composed of an alcohol having one or more hydroxyl groups in the molecule and / or a polyhydric alcohol is referred to as “organic solvent (C)”, “mixed organic solvent (S 1), mixed organic solvent”. (S2) and mixed organic solvent (S3) ”may be collectively referred to as“ mixed organic solvent, etc. ”, respectively.
- the “fine particle dispersion” according to the first aspect of the present invention comprises:
- At least part of the surface of fine particles (P) having an average particle size of 1 to 150 nm of primary particles composed of one or more of metals, alloys and metal compounds is covered with a polymer dispersant (D).
- a fine particle dispersion dispersed in a mixed organic solvent The weight ratio (D / P) of the polymer dispersant (D) to the fine particles (P) covering the surface of the fine particles (P) in the dispersion is 0.00;
- the mixed organic solvent is
- At least an organic solvent having an amide group (A) 50 to 95% by volume, an alcohol having a boiling point exceeding 100 ° C at normal pressure, and having 1 or 2 or more hydroxyl groups in the molecule and / or many Organic solvent composed of monohydric alcohol (C) Mixed organic solvent containing 5-50% by volume (S 2)
- the fine particles (P) of the present invention can be used in the vapor phase as long as at least a part of the surface of the fine particles (P) is covered with the polymer dispersant (D) in a mixed organic solvent or the like. It is also possible to use fine particles (P) produced by the synthesis method and the liquid phase synthesis method (or liquid phase reduction method)! The fine particles produced by the gas phase synthesis method are once added to another organic solvent or an inorganic solvent such as an aqueous solution together with the polymer dispersant (D), stirred and dispersed, and then the polymer dispersant (D). Fine particles (P) covered with water may be recovered from these solvents! At the time of this recovery, a process for secondary aggregation of the fine particles (P) described later is performed, and at least a part of the surface is recovered as fine particles (P) covered with the polymer dispersant (D). it can.
- the fine particles (P) are formed by liquid phase reduction in the presence of the polymer dispersant (D)
- the fine particles (P) are covered with the polymer dispersant (D) and dispersed after the reduction reaction.
- fine particles (P) not covered with the polymer dispersant (D) and the polymer dispersant (D) Those dispersed in the mixed organic solvent of the invention are also included in the technical scope of the present invention.
- the metal, alloy, metal compound, polymer dispersant (D), and mixed organic solvent in the “fine particle dispersion” according to the first aspect will be described below.
- the “metal, alloy, and metal compound (metal etc.)” of the present invention is not particularly limited, and can be appropriately selected according to the purpose and use.
- One or more metals selected from nickel, cobalt, iron, zinc, tin, aluminum, bismuth, platinum, rhodium, noradium, ruthenium, manganese, chromium, vanadium, titanium, etc., these metals It is possible to select from an alloy composed of two or more of these and one or two or more metal compounds of these metals.
- the metal compound includes metal and alloy oxides.
- oxides of metals and alloys are often contained.
- transition metal particles such as copper
- no oxides are contained.
- the oxidation level in this case varies depending on the atmosphere, temperature, and holding time during the generation and storage of the fine particles.
- the “metal compound” as used in the present invention includes all such particles in various oxidation states.
- one or more metals selected from metals such as Cu, Ag, and Au, or alloys composed of two or more of these metals are preferable.
- the average particle size of the primary particles of the fine particles (P) is;
- the primary particle diameter means the diameter of the primary particles of fine particles (P) such as individual metals constituting the secondary particles.
- the primary particle size can be measured using an electron microscope.
- the average particle diameter means the number average particle diameter of fine particles (P) such as metal.
- the average primary particle size of the fine particles (P) is preferably set to a primary particle size of 150 nm or less in consideration of, for example, disposing the dispersion on a substrate and forming a dense metal film by firing. Considering the production of the fine particles (P), it is preferable to be practically; [0024] (3) About polymer dispersant (D)
- the polymer dispersant (D) is soluble in water and exists in a solvent so as to cover the surface of fine particles made of metal or the like, and suppresses aggregation of fine particles of metal or the like. And has an effect of maintaining good dispersibility.
- the polymer dispersant (D) of the present invention has a dispersibility when dispersed in an organic solvent after the formation of the metal or the like, for example, when the fine particles (P) such as metal are produced by a gas phase synthesis method. Used to improve.
- the fine particles (P) such as metals are produced by liquid phase reduction such as electrolytic reduction of metal ions in an aqueous solution or electroless reduction using a reducing agent, water-soluble polymer dispersion in the aqueous solution It is also possible to efficiently form fine particles (P) by dissolving the agent (D) and suppressing aggregation of fine particles (P) such as metals deposited by the reduction reaction.
- fine particles such as metals are formed by a gas phase synthesis method or a liquid phase reduction method, and the surface is covered with the polymer dispersant (D)! /, NA! /
- the molecular dispersant (D) added to the mixed organic solvent of the present invention and stirring, the surface of the fine particles (P) such as metal is covered with the polymer dispersant (D), thereby improving dispersibility. Things can be used.
- the polymer dispersant (D) of the present invention has the above-described action, and is particularly capable of exhibiting a dispersing action by suppressing aggregation of fine particles (P) such as metals in the mixed organic solvent of the present invention. It is not limited.
- Such a polymer dispersant (D) is water-soluble and is present so as to cover the surface of the fine particles (P) made of metal or the like deposited in the reaction system, so that the fine particles of metal or the like ( It has the effect of suppressing the aggregation of P) and maintaining good dispersibility, and also functions to suppress the aggregation of fine particles (P) such as metals and maintain the dispersion even in the organic solvent used in the present invention. Is.
- fine particles (P) such as metals in aqueous solution by liquid phase reduction in the presence of polymer dispersant (D)
- these polymer dispersants (D) are soluble in water and exist so as to cover the surface of the deposited fine particles (P) such as metals. It suppresses the aggregation of (P) and maintains the dispersion.
- the polymer dispersant (D) does not actively separate from the fine particles (P) such as metal after the reduction reaction, and removes other impurities as necessary to remove the metal, etc. Used as a material to improve the dispersibility of fine particles (P).
- the polymer dispersant (D) depending on its chemical structure, it has a molecular weight of 100 to approximately 100,000, and is soluble in water and covers the surface of fine particles (P) such as metals. Any one can be used as long as it can be separated and recovered from the aqueous solution in a state in which the fine particles (P) such as metals can be well dispersed in the mixed organic solvent of the present invention.
- the polymer dispersant (D) is preferably an amine polymer such as polybulurpyrrolidone or polyethyleneimine; a hydrocarbon polymer having a carboxylic acid group such as polyacrylic acid or carboxymethylcellulose; polyacrylamide One or more selected from polyacrylamide, polyethylene oxide, starch, and gelatin.
- amine polymer such as polybulurpyrrolidone or polyethyleneimine
- hydrocarbon polymer having a carboxylic acid group such as polyacrylic acid or carboxymethylcellulose
- polyacrylamide One or more selected from polyacrylamide, polyethylene oxide, starch, and gelatin.
- polymeric dispersant (D) compound examples include polybulurpyrrolidone (molecular weight: 1000 to 500, 000), polyethyleneimine (molecular weight: 100 to; 100,000), carboxymethylcellulose (alkali cellulose). Degree of substitution of hydroxyl group Na salt to carboxymethyl group: 0.4 or more, molecular weight: 1000-; 100,000, polyacrylamide (molecular weight: 100-6, 000,000), polyhi, Ninore, Ninore (Molecular weight: 1000-; 100,000), Polyethylene glycolole (Molecular weight: 100-50,000), Polyethyleneoxide (Molecular weight: 50,000-90,000), Gelatin (Average molecular weight: 61,000-67, 000), and water-soluble starch.
- polybulurpyrrolidone molecular weight: 1000 to 500, 000
- polyethyleneimine molecular weight: 100 to; 100,000
- carboxymethylcellulose alkali cellulose
- Degree of substitution of hydroxyl group Na salt to carboxymethyl group degree of substitution of hydroxyl group Na salt to carboxy
- the number average molecular weights of the respective polymer dispersants (D) are shown in the parentheses, and those having such a molecular weight range are water-soluble and can be used preferably in the present invention. It is also possible to use a mixture of two or more of these.
- the weight ratio (D / P) of the polymer dispersant (D) and the fine particles (P) covering the surface of the fine particles (P) in the dispersion is 0.001 or more, In practical terms, it is 10 or less.
- the weight ratio is less than 0.001, the effect of suppressing aggregation of the fine particles (P) may not be sufficiently obtained.
- an excessive polymer dispersant (D) is added to the fine particles (P) such as metal during drying and firing. Sintering may be hindered to reduce the denseness of the film quality, and the baking residue of the polymer dispersant (D) may remain in the metal film, resulting in a decrease in conductivity.
- the weight ratio is in the range of (D / P) 0.001 to 10; from the fine particle dispersion solution, the fine particles covered with the polymer dispersant (D) (P ) Can be collected by operations such as centrifugation and confirmed by quantitative analysis.
- a microparticle dispersion solution is sampled, and microparticles (P) covered with a high molecular dispersant (D) are collected as a sample for analysis by centrifugation, and the sample is collected in an oxidizing solution.
- the molecular dispersant (D) does not react! / If a solution in which copper particles are dissolved under the conditions is prepared, and the solution is quantitatively analyzed by liquid chromatography (Liquid Chromatography), the weight ratio (D / P) Can be measured.
- a concentration operation such as evaporation is performed to perform liquid chromatography.
- analysis of specific elements (nitrogen, xio, etc.) in polymer dispersant (D), such as X-ray photoelectron spectroscopy (XPS (X_ray Photoelectron Spectroscopy)) and oage electron spectroscopy (AES (Auger Electron Spectroscopy) can be performed.
- the blending ratio of each solvent type is based on the volume ratio of each solvent before solvent mixing (hereinafter referred to as the second organic solvent). The same applies to the embodiment.)
- the mixed organic solvent (S1) is “a mixed organic solvent containing at least 50 to 95% by volume of the organic solvent (A) and 5 to 50% by volume of the organic solvent (B)”.
- the organic solvent (A) improves the dispersibility and storage stability in the mixed organic solvent, and is further baked on the substrate in the state where the fine particles (P) such as the metal are contained. When it does, it has the effect
- the organic solvent (B) is considered to have an action of reducing the interaction between solvent molecules in the mixed organic solvent and improving the affinity for the fine particles (P) such as metals and the solvent. Such an effect is generally expected in a solvent having a low boiling point. In particular, an organic solvent having a boiling point of 100 ° C. or lower at normal pressure is preferable because an effect of reducing effective interaction between solvent molecules is obtained.
- Preferred examples of the organic solvent (B) include an ether compound (B1), an alcohol (B2), a ketone compound (B3), and an amine compound (B4) described later. Among these, an ether compound ( B1) Power The effect of reducing the interaction between the solvent molecules is great, and it is preferable.
- the stirring time can be remarkably shortened, for example, about 1/2 when preparing the fine particle dispersion by irradiation with ultrasonic waves or the like.
- the organic solvent (B) when the organic solvent (B) is present in the mixed organic solvent, it can be easily redispersed even if the particles are in an aggregated state.
- the mixed organic solvent (S1) is at least 50 to 95% by volume of the organic solvent (A) and 5 to 50% by volume of the organic solvent (B)” means that the organic solvent (S1) is the organic solvent. (A) and the organic solvent (B) may be blended so that the blending ratio is 100% by volume. Further, within the range of the blending ratio, the effect of the present invention is not impaired! / It means that other organic solvent components may be blended within the range.
- the organic solvent (A), the organic solvent (B) force, and the like are preferably contained in an amount of 90% by volume or more, more preferably 95% by volume or more.
- organic solvent (A) and other organic solvent components other than the organic solvent (B) are blended, polar organic solvents such as tetrahydrofuran, diglyme, ethylene carbonate, propylene carbonate, sulfolane, dimethyl sulfoxide, etc. are used. Can be used.
- the blending amount of the organic solvent (A) in the mixed organic solvent (S1) is more preferably 60 to 90% by volume, and the blending amount of the organic solvent (B) is 10 to 30% by volume is more preferable.
- the mixed organic solvent (S2) is “a mixed organic solvent containing at least 50 to 95% by volume of the organic solvent (A) and 5 to 50% by volume of the organic solvent (C)”.
- the organic solvent (A) has the same action as that in the mixed organic solvent (S 1).
- the organic solvent (C) has an effect of improving dispersibility in the mixed organic solvent and suppressing the bonding of the fine particles (P) over time.
- organic solvent (C) is present in the mixed organic solvent, the uniformity of the sintered film is improved even when the sintering temperature is relatively low when the fine particle dispersion is applied and sintered on the substrate.
- a fired film having high conductivity can be obtained.
- the mixed organic solvent (S2) is a mixed organic solvent containing at least 50 to 95% by volume of the organic solvent (A) and 5 to 50% by volume of the organic solvent (C)” means that the organic solvent (S2) is the organic solvent.
- (A) and the organic solvent (C) may be blended so that the blending ratio is 100% by volume. Further, within the range of the blending ratio, the effect of the present invention is not impaired! This means that other organic solvent components may be blended within the range, but in this case, the organic solvent (A) and the organic solvent (C) force, and other components of 90% by volume or more are included. 95 volume% or more is more preferable.
- polar organic solvents such as tetrahydrofuran, diglyme, ethylene carbonate, propylene carbonate, sulfolane, dimethyl sulfoxide, and the like can be used.
- the blending amount of the organic solvent (A) in the mixed organic solvent (S2) is more preferably 60 to 90% by volume.
- the blending amount of the organic solvent (C) is more preferably 10 to 40% by volume.
- the mixed organic solvent (S3) is “a mixed organic solvent containing at least 50 to 94% by volume of organic solvent (A), 5 to 49% by volume of organic solvent (B), and organic solvent (C); Is.
- the organic solvent (A) and the organic solvent (B) in the mixed organic solvent (S3) are described in the mixed organic solvent (S1) except that the concentration of the organic solvent (A) is 50 to 94% by volume. It is the same.
- the organic solvent (c) improves the dispersibility in the mixed organic solvent, and has the following effects in particular. That is, the mixed organic solvent containing the organic solvent (A) and the organic solvent (B) has excellent dispersibility by stirring, but generally the organic solvent! / Tend to join.
- the organic solvent (C) is present in the mixed organic solvent, such bonding can be more effectively suppressed, and the dispersion can be further stabilized for a long period of time. Further, when the organic solvent (C) is present in the mixed organic solvent, the uniformity of the sintered film is improved when the fine particle dispersion is applied and sintered on the substrate, and a fired film having high conductivity is obtained. That power S can be.
- the mixed organic solvent (S3) is at least an organic solvent having an amide group (A) an organic solvent (B) 5 to 49% by volume, and an organic solvent (C);! To 45% by volume”
- the organic solvent (S2) may be blended from the organic solvent (A), the organic solvent (B), and the organic solvent (C) so that the blending ratio is 100% by volume. This means that the effect of the present invention is not further impaired within the range of the ratio, and other organic solvent components are blended within the range, but in this case, the organic solvent (A), the organic solvent ( It is preferable that 90% by volume or more of the component consisting of B) and the organic solvent (C) is contained, more preferably 95% by volume or more.
- polar organic solvents such as tetrahydrofuran, diglyme, ethylene carbonate, propylene carbonate, sulfolane, dimethyl sulfoxide, etc. are preferred!
- the blending amount of the organic solvent (A) in the mixed organic solvent (S3) is preferably 60 to 90% by volume. 10-30 volume% is more preferable. Further, the blending amount of the organic solvent (C) is more preferably 10 to 30% by volume.
- the organic solvent (A) and the mixed organic solvent (S 1) each containing a certain proportion of the organic solvent (B) are easily dispersed by stirring with ultrasonic waves, etc. In other words, it can be easily redispersed even if the particles are in an aggregated state.
- the organic solvent (A) and the mixed organic solvent (S 2) each containing a certain proportion of the organic solvent (C) are excellent in long-term dispersion stability, and when the fine particle dispersion is applied and sintered on the substrate. Sintering at a relatively constant temperature is possible.
- the mixed organic solvent (S3) containing a certain proportion of each of the organic solvent (A), the organic solvent (B), and the organic solvent (C) further improves dispersibility, stability, and sinterability.
- Such a mixed organic solvent (S1), mixed organic solvent (S2), and mixed organic solvent (S3) are mixed organic solvents having excellent dispersibility when forming a pattern by an ink jet method.
- organic solvent (A), the organic solvent (B), and the organic solvent (C) are shown below.
- the organic solvent (A) is a compound having an amide group (one CONH), and particularly preferably has a high relative dielectric constant.
- organic solvent (A) N-methylacetamide (191.3 at 32 ° C) N-methylformamide (182.4 at 20 ° C), N-methylpropanamide (172.2 at 25 ° C), formamide (111.0 at 20 ° C) ), N, N dimethylacetamide (37.78 at 25 ° C) 1, 3 dimethyl-2- imidazolidinone (37.6 at 25 ° C), N, N dimethylformamide (36.7 at 25 ° C), 1-methyl 2 Forces such as pyrrolidone (32.58 at 25 ° C) oxamethylphosphoric triamide (2 9.0 at 20 ° C), 2-pyrrolidinone, ⁇ -force prolatatam, and acetoamide can be used in combination.
- the number in parentheses after the name of the compound having an amide group indicates the relative dielectric constant at the measurement temperature of each solvent.
- ⁇ ⁇ ⁇ methylacetamide, ⁇ ⁇ ⁇ methylformamide, honremamide, acetoamide and the like having a relative dielectric constant force or more can be preferably used. If it is solid at room temperature, such as methylacetamide (melting point: 26 28 ° C), it can be mixed with other solvents and used as a liquid at the working temperature.
- the organic solvent (B) is an organic compound having a boiling point of 20 to 100 ° C at normal pressure; particles having an organic solvent (B) having a boiling point of less than 20 ° C at normal pressure
- the components of the organic solvent (B) may easily volatilize and the solvent composition in the dispersion may change.
- the boiling point at normal pressure is 100 ° C or less, the effect of reducing the mutual attractive force between the solvent molecules by the solvent-added calorie and further improving the dispersibility of the fine particles (P) is effectively exhibited. Can be expected.
- the organic solvent (B) As the organic solvent (B), the general formula R 1 — O— R 2 R 2 is independently an alkyl group. The number of carbon atoms is 1 to 4.
- An ether compound (B1) represented by the general formula R 3 OH (R 3 is an alkyl group having 1 to 4 carbon atoms), and an alcohol (B2) represented by the general formula R 4 — C ( ⁇ ) — R 5 (R 4 and R 5 are each independently an alkyl group having 1 to 2 carbon atoms), and a ketone compound (B3) represented by the general formula R 6 — (NR 7 ) R 8 (R 6 , R 7 and R 8 are each independently an alkyl group or a hydrogen atom, and the number of carbon atoms is 0 to 2.) B4) can be exemplified.
- Examples of the ether compound (B1) include jetyl ether (35 ° C), methylpropyl ether (31 ° C), dipropyl ether (89 ° C), diisopropyl ether (68 ° C), and methyl.
- -t-Butyl ether 55 ⁇ 3 ° C
- t-Amylmethyl ether 85 ° C
- Dibulle ether 28.5 ° C
- Ethylbulle ether 36 ° C
- Aryl ether 94 ° C
- Examples of the alcohol (B2) include methanol (64 ⁇ 7 ° C), ethanol (78.0 ° C), 1 propanol (97 ⁇ 15 ° C), 2 propanol (82.4 ° C), 2 butanol (100 ° C), 2-methyl-2-propanol (83 ° C) and the like.
- Examples of the ketone compound (B3) include acetone (56.5 ° C), methyl ethyl ketone (79.5 ° C), and jetyl ketone (100 ° C).
- Examples of the amine compound (B4) include triethylamine (89.7 ° C.) and jetylamine (55.5 ° C.).
- the organic solvent (C) is an organic compound comprising an alcohol and / or a polyhydric alcohol having a boiling point exceeding 100 ° C at normal pressure and having 1 or 2 or more hydroxyl groups in the molecule.
- both alcohol and polyhydric alcohol have a boiling point exceeding 100 ° C at normal pressure.
- alcohols having 5 or more carbon atoms and polyhydric alcohols having 2 or more carbon atoms are preferred, and those having a high relative dielectric constant, for example, 10 or more, are preferred.
- organic solvent (C) examples include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butane.
- Sugar alcohols such as D-Threitol, Erythritol, Pentaerythritol, Pentitol, and Hexitol can also be used. These include xylitol, ribitol, and arabitol.
- the hexitol includes Mannitol, Sonorbitol, Dulcitol and the like.
- ethylene glycol and glycerin are particularly preferable, in which polyhydric alcohol having two or more hydroxyl groups in the molecule is more preferable.
- the organic solvent (A) is contained in the mixed organic solvent (S 1) and the mixed organic solvent (S2) in an amount of 50 to 95% by volume and in the mixed organic solvent (S3) in an amount of 50 to 94% by volume. It is necessary. If the organic solvent (A) is less than 50% by volume, the dispersibility and storage stability of the fine particles (P) such as metals in the polar organic solvent may be insufficient.
- the organic solvent (A) in order to contain 5% by volume or more of the organic solvent (B) in the mixed organic solvent (S 1), the organic solvent (A) needs to be 95% by volume or less, and in the mixed organic solvent (S3) 5% by volume or more of organic solvent (B) In order to contain 1% by volume or more of the organic solvent (C), the organic solvent (A) needs to be 94% by volume or less.
- the concentration of the preferred organic solvent (A) in the mixed organic solvent (S1) and the mixed organic solvent (S2) is 60 to 90% by volume, particularly preferably 65 to 85% by volume.
- the organic solvent (A) has an action of improving the dispersibility and storage stability of the fine particles (P) in the mixed organic solvent, and is obtained by applying the fine particle dispersion of the present invention on a substrate and baking it. It also has the effect of improving the conductivity of the fired film.
- the organic solvent (B) needs to be contained in the mixed organic solvent (S1) and the mixed organic solvent (S3) in an amount of 5% by volume or more. If the organic solvent (B) is less than 5% by volume, the dispersion time due to physical stirring of the fine particles (P) such as metal may be shortened and the redispersibility may be insufficient.
- the organic solvent (C) must be contained in the mixed organic solvent (S2) in an amount of 5 to 50% by volume or more, and the mixed organic solvent (S3) must be contained in the amount of 1 to 45% by volume. is necessary.
- the organic solvent (C) By setting the organic solvent (C) to such a mixing ratio, the fine particles (P) such as metals aggregate in the mixed organic solvent (S2) and the mixed organic solvent (S3) even when stored for a long time. This suppresses the dispersion stability and further improves the denseness and conductivity of the fired film obtained when the fine particle dispersion is sintered.
- the organic solvent (C) is present in the mixed organic solvent (S3) so as to cover the surface of the fine particles (P), so that the above action is exerted.
- the concentration of the fine particles (P) present in the medium (S3) it is preferably 10 to 30% by volume, more preferably 15 to 25% by volume.
- the mixed organic solvent (S1) having the organic solvent (A) concentration of about 50 to 90% by volume and the other components as the organic solvent (B), or It is more preferable to use a mixed organic solvent (S3) in which the other components are the organic solvent (B) and the organic solvent (C).
- the average particle diameter of the primary particles of the fine particles (P) dispersed in the mixed organic solvent is !! to 150 nm, but the mixed organic solvent of the present invention is fine particles ( Therefore, the average secondary agglomerate size of the secondary agglomerated particles composed of these fine particles (P) is increased. It can easily be set to 500 nm or less, preferably 300 nm or less by stirring such as ultrasonic irradiation.
- the fine particle (P) whose surface is covered with the polymer dispersant (D) is recovered and dispersed in the mixed organic solvent of the present invention in the fine particle dispersion of the first aspect! It is considered that the amount of the polymer dispersant (D) that is not present on the surface of the fine particles (P) and is dissolved only in the mixed organic solvent or the like is relatively small.
- the fine particle dispersion according to the first aspect is excellent in the dispersibility of the fine particles (P) such as metal and storage stability, and is placed on a substrate by an ink jet method, dried, heated and fired, It is possible to obtain a metal thin film, a fine metal wire or the like having excellent substrate adhesion and conductivity.
- P fine particles
- Method for producing fine particle dispersion of the second aspect
- At least part of the surface of fine particles (P) having an average particle size of 1 to 150 nm of primary particles composed of one or more of metals, alloys and metal compounds is covered with a polymer dispersant (D).
- D a polymer dispersant
- the weight (D / P) force of the polymer dispersant (D) and the fine particles (P) covering the surface of the fine particles (P) in the dispersion liquid is 0.001 to 10;
- At least an organic solvent having an amide group (A) 50 to 95% by volume, an alcohol having a boiling point exceeding 100 ° C at normal pressure, and having 1 or 2 or more hydroxyl groups in the molecule and / or many Organic solvent composed of monohydric alcohol (C) Mixed organic solvent containing 5-50% by volume (S 2)
- the fine particles (P) comprising one or more of metals, alloys, and metal compounds have an average particle diameter of primary particles whose production method is not particularly limited;! To 15 Onm If so, it may be formed by any of the gas phase synthesis method or the liquid phase reduction method described later.
- the metal, alloy, and metal compound are the same as the metal, alloy, and metal compound described in the first embodiment. Further, the average particle diameter of the primary particles of the fine particles (P) is the same as that described in the first embodiment.
- the fine particles (P) are formed by a gas phase synthesis method
- the fine particles (P) and the polymer dispersant (D) are added to the mixed organic solvent of the present invention and stirred to at least partly the surface.
- the fine particles (P) covered with the polymer dispersant (D) can also be dispersed.
- the fine particles (P) whose surfaces are covered with the polymer dispersant (D) are formed in the solvent,
- the fine particles (P) may be aggregated and precipitated in a solvent, and the fine particles (P) having at least a part of the surface covered with the polymer dispersant (D) may be recovered.
- the fine particles (P) When the fine particles (P) are formed by liquid phase reduction, the fine particles (P) composed of one or more of metals, alloys, and metal compounds are dispersed in a polymer having a dispersing action of the fine particles (P). It is desirable that metal ions be reduced by liquid phase reduction in an aqueous solution in which the agent (D) is dissolved or in an organic solvent to form fine particles whose surfaces are covered with the polymer dispersant (D). ,.
- the liquid phase reduction can be carried out by reducing metal ions by electrolytic reduction or electroless reduction using a reducing agent. Force that can be applied S These liquid phase reductions can be carried out using known methods.
- the polymer dispersant (D) in the second embodiment is the same as the polymer dispersant (D) described in the first embodiment. Further, the weight ratio (D / P) of the polymer dispersant (D) and the fine particles (P) covering the surface of the fine particles (P) in the dispersion is 0.001 to 10; When the ratio of the polymer dispersant (D) is less than the above range, the effect of suppressing the aggregation of the fine particles cannot be sufficiently obtained, and the particles are coarsened or the particles are strongly aggregated due to the crosslinking effect. May form.
- excessive polymer dispersant (D) inhibits the sintering of metal fine particles during coating and drying / firing after applying the fine particle dispersion, thereby reducing the film quality.
- the firing residue of the polymer dispersant (D) may remain in the metal film to lower the electrical conductivity.
- the addition ratio is 0.5 to 10;
- the polymer dispersant (D) can be used in combination of two or more.
- At least one metal ion by liquid phase reduction and the polymer dispersant (D) are dissolved in the aqueous solution, and the metal ion is reduced by electrolytic reduction or electroless reduction using a reducing agent.
- the average particle size of primary particles comprising one or more of an alloy and a metal compound;! ⁇ 150 nm of fine particles (P) are covered with the polymer dispersant (D) and dispersed! /, Forming a fine particle-dispersed aqueous solution;
- the metal ion metal that can be used in step 1 is the same metal ion as exemplified in the first embodiment, and the ratio to the polymer dispersant (D) is the same as described in the second embodiment. It is the same.
- As the liquid phase reduction both electrolytic reduction and electroless reduction can be employed as long as fine particles (P) having an average primary particle diameter of 1 to 150 nm can be formed. Any known method can be employed.
- the metal ions used were in the liquid phase It is dispersed in an aqueous solution as fine particles (P) composed of one or more of metals, alloys, and metal compounds that have been reduced and covered with the polymer dispersant (D).
- the metal, alloy, and metal compound are the same as the metal, alloy, and metal compound described in the first embodiment.
- the amount of the polymer dispersant (D) added depends on the concentration of fine particles (P) such as metal generated from the reduction reaction aqueous solution. 1 to 5000 parts by weight is preferred 5 to 1000 parts by weight is more preferred. When the addition amount of the polymer dispersant (D) is less than 1, the effect of suppressing aggregation may not be sufficiently obtained. On the other hand, when the amount exceeds 5000 parts by weight, the fine particle dispersion of the present invention may be used. When forming a conductive thin film, fine wire, etc. by firing, an excessive polymer dispersant may inhibit sintering of fine particles (P) such as metal, or may lower the conductivity.
- P fine particles
- preferable reducing agents used in the case of electroless reduction include sodium borohydride, hydrazine, dimethylaminoborane, trimethylaminoborane, etc., and these two or more may be used in combination. it can. Fine particles (P) covered with the polymer dispersing agent (D) are formed by known liquid phase reduction using the reducing agent.
- the average particle size of the primary particles of the fine particles (P) produced by liquid phase reduction of the metal ions is:! -150 nm force S, practically forming fine particles (P) with an average particle size of 2-20 nm It is possible to do.
- the average particle diameter of the primary particles means the diameter of the primary particles of fine particles such as individual metals constituting the secondary particles.
- the primary particle size can be measured using an electron microscope.
- an average particle diameter means the number average particle diameter of a primary particle.
- the average particle size of the primary particles of the fine particles (P) is;! To 150 nm, but from practical aspects such as production and handling, the fine particles (P) of!
- the average particle size of the primary particles of the fine particles (P) is controlled by adjusting the types of metal ions, polymer dispersant (D), reducing agent and concentration, and reducing the metal ions. It can be carried out by adjusting the stirring speed, temperature, time, pH and the like. Specifically, for example, In the case of electroless liquid phase reduction, metal ions (cupric acetate, etc.) are reduced with sodium borohydride in an aqueous solution in the presence of polybulurpyrrolidone (PVP, number average molecular weight about 3500). In this case, if the reduction temperature is about 80 ° C, it is possible to obtain copper fine particles having an average primary particle size of lOOnm.
- PVP polybulurpyrrolidone
- Step 2 is a step of separating and recovering the fine particles (P) from the aqueous solution in which the fine particles (P) are dispersed, obtained in Step 1, for example, by adding an oxidizing substance
- the force S can be obtained by aggregating or precipitating the fine particles (P) as secondary particles, and separating and recovering the fine particles (P) covered with the polymer dispersant (D) from the aqueous solution.
- the oxidizing substance include oxygen gas, hydrogen peroxide, and nitric acid.
- the dispersing action of the polymer dispersing agent (D) is lowered, and the secondary fine particles (P) in the aqueous solution progress in the secondary aggregation, and become aggregates or precipitates.
- the polymer dispersant (D) is present so as to cover the surface of the secondary agglomerated particles, and the polymer dispersant (D) is largely detached from the surface of the fine particles (P).
- the agglomerates or precipitates are collected by filtration by an operation such as centrifugation.
- an operation such as centrifugation.
- the impurities are removed by washing with water or alcohol under conditions that make it difficult to remove the polymer dispersant (D). It is possible to obtain fine particles (P) whose surfaces are covered with the polymer dispersant (D) by removing them.
- the fine particles (P) obtained by force the primary particles have an average particle diameter of 1 to 150 nm, and secondary agglomeration! /, At least a part of the surface of the fine particles (P) It is covered with the polymer dispersant (D).
- the amount of the polymer dispersant (D) that covers the surface of the fine particles (P) in the dispersion is determined after the dispersion of the fine particles (P) in the mixed organic solvent in the following steps! Force required to make the weight ratio (D / P) to the fine particles (P) 0.001 to 10;
- the weight ratio (D / P) can be 0.001 to 10; fine particles (P) are well dispersed in a mixed organic solvent or the like.
- the fine particles (P) partially covered with the polymer dispersant (D) are redispersed in the mixed organic solvent (S 1), mixed organic solvent (S2), or mixed organic solvent (S3), This is a step of obtaining a fine particle dispersion in which the fine particles (P) are dispersed in these mixed organic solvents.
- the solvent types and the blending ratios used for the mixed organic solvent (S 1), the mixed organic solvent (S2), and the mixed organic solvent (S3) are the same as described in the first aspect. It is the same.
- the ultrasonic irradiation time is not particularly limited and can be arbitrarily selected. For example, if the ultrasonic irradiation time is arbitrarily set between 5 and 60 minutes, the average secondary aggregate size tends to be smaller as the irradiation time is longer.
- the redispersed fine particle dispersion is stored after use until it is used, but the fine particle dispersion of the present invention is characterized by excellent storage stability.
- the weight ratio (D / P) of the polymer dispersant (D) and the fine particles (P) covering the fine particle (P) surface in the fine particle dispersion is, for example, (a) or (b ).
- (a) Collecting the fine particle dispersion, separating the fine particles (P) from the fine particle dispersion by an operation such as centrifugation, and the like, under conditions where the polymer dispersant (D) does not react in the oxidizing solution.
- a solution in which copper particles are dissolved is prepared, and the polymer dispersant (D) is quantitatively analyzed by liquid chromatography (Liquid Chromatography) or the like to measure the weight ratio (D / P).
- the detection limit of the polymer dispersant (D) by the analytical method can be about 0.02% by weight.
- Metal analysis can be performed by a known method.
- (b) Collect the fine particle dispersion, separate the fine particles (P) from the fine particle dispersion by an operation such as centrifugation, and remove the polymer dispersant (D) from the fine particles (P) by an operation such as solvent extraction. After extraction into the solvent, if necessary, perform concentration operations such as evaporation, and X-ray photoelectron spectroscopy for specific elements (nitrogen, ion, etc.) in the liquid chromatograph or polymer dispersant (D). (XP 3 ⁇ X-ray Photoelectron Spectroscopy)), nye electron spectroscopic force, analysis (AE ⁇ > (Auger Electron Spectroscopy)) and the like.
- the fine particle dispersion is placed on a substrate by an ink jet method at a relatively low temperature of, for example, about 200 ° C. without using a reducing gas such as hydrogen gas, dried, fired, and made conductive. It is possible to form a metal-containing thin film or a metal-containing thin wire.
- the substrate is not particularly limited, and glass, polyimide or the like can be used depending on the purpose of use, and drying and baking are performed in an inert gas atmosphere such as argon. Drying conditions depend on the polar solvent used, but for example, 100-200 ° C for about 15-30 minutes, and firing conditions depend on the coating thickness, for example, 190-250 ° C, for about 20-40 minutes. Preferably, the temperature is 190 to 220 ° C for 20 to 40 minutes.
- Such metal-containing thin film or a metal-containing thin lines obtained in has a conductivity, the electric resistance value is 1. For example less OQ cm, 1. 0 X 10- 5 ⁇ « ⁇ ; 10 X 10- 4 ⁇ «it is possible to achieve the degree of ⁇ . Furthermore, the metal-containing thin film is excellent in substrate adhesion.
- the average particle size of primary particles in the fine particle dispersion was determined by observation with a transmission electron microscope (manufactured by JEOL Ltd., model: JEM-3010).
- the secondary agglomeration size is obtained from a particle size distribution measurement by a dynamic light scattering type particle size distribution analyzer (Sysmex Corporation, model: Zetasizer Nano Series Nano-ZS). Asked.
- the average particle diameter and dispersibility of the primary particles of the copper fine particle dispersion were evaluated as follows.
- copper fine particles whose surfaces were covered with a polymer dispersant were prepared by the following method. Copper acetate ((CH COO) Cu- IH O) 0.2g as distilled water 10ml distilled water 10ml
- the aqueous solution was put into a centrifuge and copper fine particles were collected. Then, after putting the collected fine particles and 30 ml of distilled water into a test tube, stirring well using an ultrasonic homogenizer, and performing a washing operation to collect the particle components once with a centrifuge, the polymer dispersant is obtained. Copper fine particles with the surface covered were obtained.
- the copper fine particles recovered by the above steps are obtained by using N-methylacetamide as an organic solvent (A) as an example of the mixed organic solvent of the present invention, jetyl ether as an organic solvent (B), and an organic solvent.
- Ethylene glycol as (C) volume ratio 90: 10: 0 60: 40: 0 90: 0: 10 60: 0: 40 90: 5: 5 70:15:15 60:20:20 60:10:
- the fine particle dispersion of the present invention was obtained by dispersing each in 10 ml of a solvent mixed at 30 50:20:30 and applying ultrasonic vibration for 1 hour in the dispersion using an ultrasonic homogenizer.
- the same copper fine particles were mixed into a mixed solvent in which the volume ratios of the organic solvents (A), (B), and (C) were 20: 0: 80 20:40:40, 0: 0: 100, respectively.
- a dispersed fine particle dispersion was obtained.
- Example 19 the copper fine particles are dispersed in a mixed organic solvent composed of the organic solvent (A), the organic solvent (B), and the organic solvent (C) of the present invention, whereby the storage stability is improved. Extremely high! / ⁇ It was confirmed that a fine particle dispersion was obtained. On the other hand, in Comparative Example 1 1 ;! to 3, the storage stability was relatively poor.
- a copper fine particle dispersion prepared by the same method as described in Example 1 was prepared by using ⁇ -methylacetamide as the organic solvent ( ⁇ ) of the present invention, and jetyl ether as the organic solvent ( ⁇ ).
- Ethylene glycol as solvent (C) volume ratio 90: 10: 0, 60: 40: 0, 90: 0: 10 , 60: 0: 40, 90: 5: 5, 70:15:15, 60:20:20, 60:10:30, 50:20: 30 Dispersed in a mixed solvent dispersed in 10 ml of solvent Example 2—;!
- Tables 3 and 4 show the measurement results. From Tables 3 and 4, the copper fine particle dispersions of Example 2-!! ⁇ 9 are fired films with good conductivity by glass substrate coating and drying, followed by heat treatment at a temperature of 250 ° C or higher in a nitrogen atmosphere. I was able to. The fired film obtained in Comparative Example 2 was insulative.
- N-methylacetamide (% by volume) 90 70 60 60 50
- Jetyl ether (volume%) 5 15 20 10 20 ULVAC, Inc.
- Ethylene glycol (volume%) 5 15 20 30 30 Copper nanoparticles evaluation results (electrical resistance)
- the substrate adhesion of the fired film obtained from the fine particle dispersion was evaluated as follows. First, copper fine particles prepared by the same method as described in Example 1, N-methylacetamide as the organic solvent (A) of the present invention, jetyl ether as the organic solvent (B), organic solvent (C) with ethylene glycol, volume ratio 90: 10: 0, 60: 40: 0, 90: 0: 10, 60: 0: 40, 90: 5: 5, 70:15:15, 60:20 : 20, 60:10:30, 50:20:30 mixed in 10 ml of solvent dispersed in mixed solvent Example 3—;!
- the presence or absence of the polymer dispersant in the copper fine particles of the present invention was evaluated as follows. First, according to the method of Example 1, N-methylacetamide as the organic solvent (A), jetyl ether as the organic solvent (B), ethylene glycol as the organic solvent (C), and volume ratio 90: The fine particle component covered with the polymer dispersant in the copper fine particle dispersion prepared by dispersing at a ratio of 5: 5 was collected by centrifugal sedimentation using a centrifuge. An eluent prepared by mixing 0.2 M nitric acid aqueous solution, 0.2 M hydrochloric acid, and methanol 1: 1: 2 was added to the obtained copper fine particles to dissolve the copper particle components.
- a fine particle dispersion in which fine particles such as metal are dispersed in an organic solvent is an inkjet ink, an etching resist, a solder resist, a dielectric pattern, an electrode (conductor circuit) pattern, a wiring pattern of an electronic component, a conductive pattern. It can be widely used for conductive paste, conductive ink, conductive film, and the like.
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JP2006304361A JP5764279B2 (ja) | 2006-11-09 | 2006-11-09 | 焼成体形成用微粒子、焼成体形成用微粒子分散溶液、焼成体形成用微粒子の製造方法、及び焼成体形成用微粒子分散溶液の製造方法 |
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Also Published As
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US20100113647A1 (en) | 2010-05-06 |
US8337726B2 (en) | 2012-12-25 |
TWI389750B (zh) | 2013-03-21 |
TW200812729A (en) | 2008-03-16 |
KR101375488B1 (ko) | 2014-03-18 |
KR20090043500A (ko) | 2009-05-06 |
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