JP2003262974A - Metal-containing particle and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal-containing particle which can hold sufficient charge quantity and uniform chargeability and to provide its manufacturing method and electrophotographic toner using the same. <P>SOLUTION: The metal-containing particle is characterized in that it contains a metal particle and a resin as essential components and a compound having charge controllability is present at a surface of the particle. The method for manufacturing the metal-containing particle is characterized in that the particle containing the metal particle and the resin as the essential components are blended with a compound having the charge controllability in a dispersing medium. The electrophotographic toner is characterized in that it is manufactured by using the metal-containing particle. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to metal-containing particles that essentially include metal particles and a resin, a method for producing the same, and an electrophotographic toner using the same.

[0002]

2. Description of the Related Art As a recent method for forming a conductive layer, an electrophotographic method using composite particles of metal and resin is known. Since an organic solvent is not required in the electrophotographic method, it is a preferable method in terms of environmental protection and influence on the human body. Further, since the conductive layer pattern can be easily formed by using a copying machine, the manufacturing efficiency is excellent. In particular,
For example, the electrophotographic photosensitive layer on the photosensitive plate is charged,
The circuit original plate is irradiated and exposed to light to form this optical image on the photosensitive layer by electrostatic charging, and a toner formed of composite particles is attached to the optical image portion by an electrophotographic developing method to form a conductor pattern. Subsequently, the printed board is closely attached to the photosensitive plate having the conductor pattern formed on the surface thereof and heated to transfer and fix the toner to the printed board.

However, the conventional composite particles used in the electrophotographic system are still insufficient in chargeability,
It is often non-uniform. Further, when a conductive pattern is formed using such composite particles, there is a problem that fog is caused by scattering of the particles and it cannot be applied to a high quality electrophotographic toner.

[0004]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to provide a metal-containing particle capable of maintaining a sufficient charge amount and a uniform chargeability, a method for producing the same, and a method for using the same. It is to provide a toner for electrophotography.

[0005]

Means for Solving the Problems The present inventor has conducted extensive studies in order to solve the above problems. As a result, a specific compound, that is, a metal-containing particle obtained by allowing a compound having a charge control ability to exist on the surface of the particle containing metal particles and a resin as essential components, holds the desired sufficient charge amount. It has been found that the particles can be made into particles. Further, it has been found that even if the particles containing the metal particles and the resin as essential components have poor charging uniformity, excellent uniformity can be maintained. It was found that the above problems can be solved by the metal-containing particles, the method for producing the same, and the electrophotographic toner using the same based on such findings, and the present invention was completed by confirming them.

That is, the metal-containing particles according to the present invention are characterized in that they contain metal particles and a resin as essential components, and that a compound having a charge control ability is present on the particle surface. The method for producing metal-containing particles according to the present invention is characterized by mixing particles containing metal particles and a resin as essential components and a compound having a charge control ability in a dispersion medium. An electrophotographic toner according to the present invention is characterized by using the above-mentioned metal-containing particles of the present invention.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The metal-containing particles, the method for producing the same, and the electrophotographic toner according to the present invention will be described in detail below, but the scope of the present invention is not limited to these descriptions, and the following examples are given. Other than the above, appropriate implementation is possible within the range that does not impair the gist of the present invention. The metal-containing particles according to the present invention are particles in which a compound having charge controllability is present on the surface of particles containing metal particles and a resin as essential components. The use of the metal-containing particles is not particularly limited, and specifically, for example, electrophotographic toner, anisotropic conductive material, metal filler, and the like.

The form of the particles containing the metal particles and the resin as essential components is not particularly limited, but specifically, for example, a form in which the surface of the metal particles is coated with a resin, or Examples thereof include a form in which metal particles are dispersed. Examples of the form in which the metal particle surface is coated with a resin include a form in which the metal particle surface is covered with a resin layer, and a form in which the metal particle surface is covered with a resin particle, but particularly in these There is no limitation.
Further, when the resin particles adhere to the surface of the metal particles or after the adhesion, some or all of the resin particles may be melted. Examples of the form in which the metal particles are dispersed in the resin include a form in which fine metal particles are dispersed in the resin, and a form in which fine metal particles and resin particles are aggregated into secondary particles. Examples thereof include, but are not limited to, a form in which an aggregate of metal particles is dispersed in a resin. Further, a part or all of the resin particles may be melted when the fine metal particles and the resin particles are aggregated into secondary particles or after the aggregation. Further, the surface of the particles in which metal particles are dispersed in the resin may be coated with the resin.

The metal particles are not particularly limited, but specifically, for example, gold, platinum, palladium,
Noble metals such as silver, ruthenium, rhodium, osmium, and iridium, and noble metal alloys containing 50% by weight or more of these noble metals, iron, nickel, cobalt, copper, zinc,
Examples include base metals such as lead, aluminum, titanium, vanadium, chromium, manganese, zirconium, molybdenum, indium, antimony, and tungsten, and alloys of these noble metals and base metals. These may be used alone or in combination of two or more. When the metal-containing particles according to the present invention are used in a toner for electrophotography, as the metal particles, copper, nickel, gold, silver, platinum, palladium, ruthenium, molybdenum, tungsten, or the like having good electrical conductivity in a metal state. Preference is given to using the substances indicated. Of these, copper is particularly preferable because it is easy to oxidize and reduce, and it is also easy to finally chemically bond it to the resin.

When used as a one-component toner, it is preferable to use a metal exhibiting ferromagnetism such as iron, cobalt and nickel, or an alloy of these metals. The resin is not particularly limited, but specific examples thereof include crosslinked and non-crosslinked resins, organic pigments, waxes and the like. Examples of the crosslinked and non-crosslinked resins include styrene resins, acrylic resins, methacrylic resins, polyethylene resins, polypropylene resins, silicone resins, polyester resins, polyurethane resins, polyamide resins, epoxy resins. , Polyvinyl butyral resin, rosin resin, terpene resin, phenol resin, melamine resin, guanamine resin and the like.

The above resin can be obtained by polymerizing various monomers such as a monomer having a functional group, a monomer having no functional group, and a crosslinkable monomer. The various monomers may be used alone or in combination of two or more. The monomer having a functional group is not particularly limited, but specifically, for example, those having a carboxyl group such as acrylic acid, methacrylic acid, and itaconic acid, β-hydroxyethyl acrylate, β-hydroxyethyl methacrylate. , Those having a hydroxyl group such as β-hydroxypropyl acrylate, β-hydroxypropyl methacrylate and allyl alcohol, those having a methylol group such as N-methylol acrylamide and N-methylol methacrylamide, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate Those having an amino group such as, those having an acid amide such as acrylamide and methacrylamide, glycidyl acrylate,
Those having a glycidyl group such as glycidyl methacrylate and glycidyl allyl ether, those having an oxazolyl group such as 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, etc. Are illustrated respectively. Also, γ-methacryloxypropyltrimethoxysilane,
Examples thereof include those having a hydrolyzable silyl group such as vinyltriacetoxysilane and vinyltrimethoxysilane.

The monomer having no functional group is not particularly limited, and specifically, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate, n-butyl acrylate, iso. -Butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, tetrahydrofurfuryl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, lauryl methacrylate, trifluoroethyl methacrylate, per Fluorooctyl ethyl methacrylate, methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, is - butyl ether, n
-Butyl vinyl ether, styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl chloride, vinyl fluoride, vinylidene fluoride, ethylene, propylene, isopropylene, chloroprene,
Butadiene etc. are mentioned.

The crosslinkable monomer is not particularly limited, but specifically, for example, divinylbenzene, divinylnaphthalene, ethylene glycol dimethacrylate, diethyl glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylolpropane. In the molecule such as triacrylate, allyl methacrylate, t-butylaminoethyl methacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, N, N-divinylaniline, divinyl ether, divinyl sulfide, divinyl sulfonic acid Examples thereof include monomers having two or more unsaturated groups.

It should be noted that the classification of the above-mentioned monomers is merely for convenience, and there is no limitation on the classification. The content ratio of the metal particles in the particles containing the metal particles and the resin as essential components is specifically, for example, 50 to 98.
It is preferably in a weight percentage, more preferably 60 to 9
It is 8% by weight, and even more preferably 70 to 98% by weight. The content ratio of the resin in the metal-containing particles according to the present invention is specifically, for example, preferably 2 to 50% by weight, more preferably 2 to 40% by weight, still more preferably 2 to 40% by weight. It is 30% by weight. If the metal content is less than 50% by weight (resin content is more than 50% by weight), the contact probability of the metal particles decreases and the conductivity decreases when the toner is baked at high temperature after printing. Not preferable. If the metal content exceeds 98% by weight (resin content is less than 2% by weight), it is difficult to uniformly charge the toner and a precise image cannot be formed, which is not preferable.

In the particles containing the metal particles and the resin as essential components, as described above, the form in which the surface of the metal particles is coated with the resin, the form in which the metal particles are dispersed in the resin, and the like are mentioned. However, as a method for producing particles having a form in which the metal particle surfaces are coated with a resin,
Although not particularly limited, for example, a mechanical treatment method (for example, a method of attaching resin particles to the surface of the metal mother particles by using mechanical impact force) a hetero-aggregation method (generally, a resin particle on the surface of the metal mother particles). Method of adhering resin child particles by using electrostatic attraction of particle surface) Chemical bonding method (for example, as disclosed in Japanese Patent Laid-Open No. 2001-342377 by the present inventors, having a functional group A on the surface) Metal mother particles,
A method of coating the surface of the metal mother particles with a resin by mixing the resin particles having a functional group B capable of reacting with the functional group A on the surface. Emulsion method (for example, by dissolving the resin in an organic solvent) A method of dispersing metal particles and emulsifying and granulating the particles in water). Further, the method for producing particles having a form in which metal particles are dispersed in the resin is not particularly limited, for example, a method of melt kneading resin and metal particles and pulverizing and classifying (kneading pulverizing method ) And the like.

The kneading and pulverizing method is not particularly limited, but specifically, for example, after the metal particle powder and the resin are melt-kneaded by a usual method, the obtained kneaded product is roughly pulverized. Further, a method of finely pulverizing and classifying to a desired particle size by using a known classifying device and the like can be mentioned. In the metal-containing particles of the present invention, the compound having charge controllability is not particularly limited, but has a functional group capable of exhibiting charge controllability (charge control group), and A compound having reactivity with the surface, for example, a compound capable of reacting with metal particles to form a complex, a compound capable of reacting with a resin or a functional group in the resin, and the like are preferable. Among them, compounds capable of reacting with metal particles to form a complex are more preferable, and as the metal-containing particles according to the present invention, those in which the compound having the charge control ability can chemically bond with the surface of the metal particles are used. It is preferable because it has excellent insulating properties and can hold a sufficient amount of charge.

Examples of the charge control group include primary / primary /
Secondary / tertiary amino group, quaternary ammonium salt, pyridyl /
Cationic functional groups such as heterocyclic compounds such as pyrrolinyl / piperidyl, halogenated alkyl groups, sulfonic acid groups,
Examples thereof include anionic functional groups such as a carboxyl group, a hydroxyl group, an epoxy group, a mercapto group, a thiol group, a thioepoxy group, a cyano group and an ether group. The compound capable of forming a complex by reacting with the metal particles is not particularly limited, for example, a mercapto group, a compound having a functional group capable of forming a complex such as β-diketo group, a silane coupling agent, Aluminum coupling agents, titanate coupling agents, etc. may be mentioned.

The compound capable of reacting with the resin or the functional group in the resin is not particularly limited, but may be a compound having a functional group capable of chemically reacting with the functional group of the resin. The functional group can be arbitrarily selected so that the functional groups can be chemically bound to each other, and is not particularly limited, and specific examples thereof include an aziridine group and an oxazoline group. , Epoxy group, thioepoxy group, amide group, isocyanate group, acetoacetyl group, carboxyl group, carbonyl group, hydroxyl group, amino group, aldehyde group, mercapto group,
Examples thereof include sulfone groups. In the compound having charge controllability, the group having charge controllability, the functional group capable of reacting with a metal, and the functional group capable of reacting with a functional group in a resin are each a single or a plurality of identical functional groups. Or may exist as separate functional groups in one molecule of the compound. In addition, the compound has a functional group of 1
There may be only one or a plurality of functional groups, and when they have a plurality of functional groups, they may be the same or different functional groups.

The compound having a cationic functional group is not particularly limited, but specific examples thereof include octylamine, dibutylamine, trihexylamine,
m-phenylenediamine, dimethylaminoethanol,
Examples thereof include nitrogen-containing compounds such as 2-amino-6-methylpyridine, tetraethylammonium bromide and hexadecyltrimethylammonium chloride. These may be used alone or in combination of two or more. The compound having an anionic functional group is not particularly limited, but specifically, for example, 2, 4, 6
-Trimercapto-S-triazine, 2-dibutylamino-4,6-dimercapto-S-triazine, 2-phenylamino-4,6-dimercapto-S-triazine,
2,4-Dichlorohexylamino-6-mercapto-S
-Triazine, 1,6-dimercaptohexane, dimercaptodiethyl ether, 1,5- or 2,7-dimercaptonaphthalene, n-octylmercaptan, t-
Mercapto compounds such as dodecyl mercaptan and their alkali metal salts or alkaline earth metal salts; halogen compounds such as trifluoroacetic acid, pentadecafluorooctanoic acid, perfluorotributylamine, trifluoroacetoxytrimethylsilane; dodecylbenzenesulfonic acid, 1 , 2-Cyclohexanedicarboxylic acid, 2,6
Examples thereof include acid compounds such as naphthalenedicarboxylic acid and p-hydroxybenzoic acid, and alkali metal salts or alkaline earth metal salts thereof. They are,
They may be used alone or in combination of two or more.

In the metal-containing particles according to the present invention,
It is preferable that the compound having the charge control ability is uniformly treated and present on the surface of the particles that essentially include the metal particles and the resin. The compound having the charge control ability is preferably contained in an amount of 0.01 to 20% by weight, more preferably 0.05 to 1 in the entire metal-containing particles.
It is 0% by weight, and even more preferably 0.1 to 5% by weight. When the content of the compound having a charge controllability is less than 0.01% by weight, the surfaces of the particles, which essentially include the metal particles and the resin, are allowed to exist uniformly, and further, the presence on the metal surface of the particle surface. May not be possible,
If it exceeds 20% by weight, there are many portions that do not exist on the surface of the particle but exist inside and do not contribute to charging, and there is a possibility that further improvement of the effect cannot be expected, which is also not preferable in terms of cost.

In the metal-containing particles according to the present invention,
Since the compound having the charge controllability is present on the surface of the particles, a sufficient amount of charge can be maintained and the chargeability thereof can also be maintained uniformly. Therefore, even if the surface of the metal particles is not completely covered with the resin, or even if the resin content is smaller than before, the same or more charging as the completely covered form or the form having a sufficient amount of resin is charged. The uniformity of quantity and excellent chargeability can be maintained. Further, in the metal-containing particles of the present invention, it is preferable that the surface of the metal-containing particles is completely covered with a resin, because the charge amount and the uniformity of chargeability are excellent.

Further, in the metal-containing particles of the present invention,
As a secondary effect, the compound having the charge control ability is
When the resin has a plurality of functional groups capable of reacting with the functional group in the resin, the resin in the surface layer (near the surface) of the metal-containing particles may be crosslinked, which may improve the mechanical strength of the metal-containing particles themselves. it can. The method for producing metal-containing particles according to the present invention is a method of treating the surface of particles containing metal particles and a resin as essential components with a dispersion medium containing a compound having a charge controllability. As the metal particles, the resin and the compound having a charge control ability, the same compounds as those described in the description of the metal-containing particles of the present invention can be preferably mentioned.

The dispersion medium is not particularly limited, but specifically, for example, water and alcohols such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol; liquid paraffin. , Hydrocarbons such as toluene, xylene, and cyclohexane; silicone oils such as polydimethylsiloxane and fluorosilicone oils; halogenated hydrocarbons such as chlorobenzene, dichlorobenzene, bromobenzene, chlorobiphenyl, chlorodiphenylmethane; Daifloyl Examples thereof include fluorides such as those manufactured by the company) and Demnum (manufactured by Dyxy Industry Co., Ltd.), and these can be used alone or in combination of two or more. In particular, it is preferable to use a dispersion medium that can dissolve the compound having the charge control ability without dissolving the resin.

The method of allowing the compound having the charge control ability to exist on the surface of the particles containing the metal particles and the resin as essential components is not particularly limited, but specifically,
Particles containing metal particles and a resin as essential components, and a compound having a charge controllability, a method of mixing or mixing and stirring in a dispersion medium can be preferably mentioned, or, metal particles and a resin as an essential component Containing particles,
In a dispersion medium in which a compound having a charge control ability is dissolved,
The method of charging or charging and stirring can be preferably mentioned. In the above method, the treatment temperature is not particularly limited because suitable conditions vary depending on the concentration and the type of functional group, but is preferably, for example, 20 to 200 ° C, more preferably 20 to 150 ° C. More preferably, it is 20 to 100 ° C. The treatment temperature is preferably lower than the glass transition temperature of the above resin in order to prevent fusion of particles to each other.

The electrophotographic toner according to the present invention comprises the above metal-containing particles of the present invention. The toner for electrophotography according to the present invention may have a form in which the composite particles are used as they are, or a form in which some other component is further added to the composite particles, and the form is not particularly limited. It is not done. The metal-containing particles obtained as described above can hold a sufficient amount of charge uniformly and, when used as a toner, can prevent fogging due to scattering of particles, and thus are suitably used for electrophotographic toners. It

In the electrophotographic toner according to the present invention, the above-mentioned metal-containing particles can be used as the toner particles as they are, but if necessary, additives such as a charge control agent and a fluidizing agent may be excluded. It is also possible to add them internally or internally. As the charge control agent, for example, nigrosine,
Monoazo dye, zinc, hexadecyl succinate, alkyl ester or alkylamide of naphthoic acid, nitrohumic acid, N, N-tetramethyldiaminebenzophenone, N, N-tetramethylbenzidine, triazine,
Examples thereof include salicylic acid metal complexes, but are not particularly limited thereto.

Examples of the fluidizing agent include inorganic particles such as colloidal silica, hydrophobic silica, hydrophobic titania, hydrophobic zirconia, and talc, and organic fine particles such as polystyrene beads and (meth) acrylic resin beads. However, the present invention is not limited to these. Moreover, you may mix | blend various well-known coloring agents depending on the case. Further, in a mode in which a ceramic green sheet, a sintered ceramics sheet, or the like is used as a substrate on which a desired pattern is formed by the toner, and the organic component contained in the toner is removed by further heating after fixing the toner, From the viewpoint of enhancing the adherence of the metal component of the toner to the ceramics after removal of various organic components, PbO—SiO ₂ —B ₂ O ₃ and PbO—S may be added to the toner as necessary.
iO ₂ -Al ₂ O ₃ -ZnO, it may be blended with the glass components such as _{PbO-ZnO-B 2 O 3} .

The electrophotographic toner according to the present invention uses metal-containing particles capable of uniformly maintaining a sufficient amount of charge due to the presence of the charge control groups concentrated on the surface. The toner can be suppressed and becomes a high quality electrophotographic toner.

[0029]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. —Example 1— 80 parts by weight of copper particles having an average particle size of 0.5 μm and a styrene-acrylic copolymer containing a glycidyl group (styrene / n
-Butyl methacrylate / glycidyl methacrylate =
80/15/5) 20 parts by weight were melt-kneaded with a Labo Plastomill at 150 ° C. for 30 minutes. This was coarsely pulverized in a mortar, then finely pulverized by a jet mill, and coarse powder and fine powder were cut by an air classifier to obtain copper-containing particles (1) having an average particle diameter of 7.5 μm.

100 parts by weight of the copper-containing particles (1),
1 part by weight of 2,4,6-trimercapto-S-triazine and 100 parts by weight of methanol were placed in a reaction vessel and stirred at room temperature for 1 hour, after which toner particles were allowed to settle and the supernatant was removed. Unreacted 2,4,6-trimercapto-S-
The triazine was washed off with methanol and dried in a vacuum drier to obtain a toner (2). As a result of hand-mixing 17 parts of the silicon-coated ferrite carrier with 3 parts of the toner (2) and measuring the charge amount by the blow-off method, -8.9 μC / g
Met. Using this toner (2), with a commercially available copying machine,
A 0.1 mm wide line was formed at 0.1 mm intervals on an A4 size ceramic green sheet having a thickness of 25 μm. This ceramic green sheet was heated to 900 ° C. at a rate of 0.5 ° C./min in a reducing atmosphere and held at the same temperature for 2 hours for firing / sintering. As a result, copper was mainly found on the sintered ceramic sheet. The images of the components were accurately fixed without any background fog. Then, electrical continuity was confirmed at any part of this image that was continuously connected.

Example 2 Fine particles of styrene-acrylic copolymer containing 95 parts by weight of copper particles having an average particle diameter of 5.5 μm and a glycidyl group synthesized by an emulsion polymerization method (styrene / n-butyl methacrylate /
5 parts by weight of glycidyl methacrylate = 80/15/5, average particle size 0.3 μm) were mixed and processed using a hybridization system (manufactured by Nara Machine Co., Ltd.), and an average particle having a polymer layer on the surface of copper particles. Copper-containing particles (3) having a diameter of 6.0 μm were obtained. Observation with a scanning electron microscope (SEM) confirmed that the surfaces of the copper particles were uniformly coated with the polymer.

100 parts by weight of the copper-containing particles (3),
1 part by weight of 2,4,6-trimercapto-S-triazine and 100 parts by weight of methanol were placed in a reaction vessel and stirred at room temperature for 1 hour, after which toner particles were allowed to settle and the supernatant was removed. Unreacted 2,4,6-trimercapto-S-
Triazine was washed off with methanol and dried in a vacuum drier to obtain Toner (4). 3 parts of Toner (4) was hand-mixed with 17 parts of the silicon-coated ferrite carrier, and the charge amount was measured by the blow-off method. The result was -11.2 μC /
It was g. Using this toner (4), a line was formed in the same manner as in Example 1 and firing / sintering was performed. As a result, an image containing copper as a main component was found on the sintered ceramic sheet with no background fog, and was precise. It was fixed. Then, electrical continuity was confirmed at any part of this image that was continuously connected.

-Comparative Example 1-In Example 1, 2,4,6-trimercapto-S-
The copper-containing particles (1) before being treated with triazine were used as toner (5). Silicon coated ferrite carrier 17
3 parts of Toner (5) was hand-mixed and the charge amount was measured by the blow-off method. As a result, it was -0.9 [mu] C / g. Using this toner (5), a line was formed in the same manner as in Example 1, followed by firing and sintering. As a result, the image fixed on the sintered ceramic sheet was unclear, and very large fog was observed. Was given.

Comparative Example 2-80 parts by weight of copper particles having an average particle size of 0.5 μm and a styrene-acrylic copolymer containing glycidyl groups (styrene / n
-Butyl methacrylate / glycidyl methacrylate =
80/15/5) 20 parts by weight and 3 parts by weight of Spiron Black TRH (Hodogaya Chemical Co., Ltd.) as a charge control agent were melt-kneaded at 150 ° C. for 30 minutes using a Labo Plastomill. This was coarsely pulverized in a mortar, then finely pulverized by a jet mill, and coarse powder and fine powder were cut by an air classifier to obtain a toner (6) having an average particle size of 7.1 μm.

3 parts of Toner (6) was hand-mixed with 17 parts of the silicon-coated ferrite carrier, and the charge amount was measured by the blow-off method. As a result, it was -5.7 μC / g. Using this toner (6), a line was formed and fired and sintered in the same manner as in Example 1. As a result, an image mainly composed of copper was fixed on the sintered ceramic sheet. Was recognized in large numbers.

[0036]

According to the present invention, it is possible to provide metal-containing particles capable of maintaining a sufficient charge amount and uniform chargeability, a method for producing the same, and an electrophotographic toner using the same. .

Claims (5)

[Claims] 1. A metal particle and a resin are contained as essential components,
A compound having a charge control ability is present on the particle surface,
Metal-containing particles. 2. The metal-containing particles according to claim 1, wherein the compound having a charge controllability is a compound having a mercapto group. 3. A method for producing metal-containing particles, which comprises mixing particles containing metal particles and a resin as essential components and a compound having a charge control ability in a dispersion medium. 4. The compound having charge controllability is a compound having reactivity with the surface of the metal particles.
The method for producing metal-containing particles as described in 1. 5. An electrophotographic toner comprising the metal-containing particles according to claim 1 or 2.