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WO2015060046A1 - Encre en poudre pour développement d'image latente électrostatique et procédé de production d'encre en poudre pour un développement d'image latente électrostatique - Google Patents

Encre en poudre pour développement d'image latente électrostatique et procédé de production d'encre en poudre pour un développement d'image latente électrostatique Download PDF

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Publication number
WO2015060046A1
WO2015060046A1 PCT/JP2014/074674 JP2014074674W WO2015060046A1 WO 2015060046 A1 WO2015060046 A1 WO 2015060046A1 JP 2014074674 W JP2014074674 W JP 2014074674W WO 2015060046 A1 WO2015060046 A1 WO 2015060046A1
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WIPO (PCT)
Prior art keywords
toner
shell layer
wax
electrostatic latent
latent image
Prior art date
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PCT/JP2014/074674
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English (en)
Japanese (ja)
Inventor
杉本　博子
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Kyocera Document Solutions Inc
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Kyocera Document Solutions Inc
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Publication date
Application filed by Kyocera Document Solutions Inc filed Critical Kyocera Document Solutions Inc
Publication of WO2015060046A1 publication Critical patent/WO2015060046A1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/093—Encapsulated toner particles
    • G03G9/09392—Preparation thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08775—Natural macromolecular compounds or derivatives thereof
    • G03G9/08782—Waxes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/093—Encapsulated toner particles
    • G03G9/09307—Encapsulated toner particles specified by the shell material
    • G03G9/09314—Macromolecular compounds

Definitions

  • the present invention relates to an electrostatic latent image developing toner and a method for producing the electrostatic latent image developing toner.
  • the electrostatic latent image developing toner is fixed on a recording medium such as paper by heating and pressurizing using a fixing roller, for example.
  • a fixing roller for example.
  • the toner component in the toner is melted or softened by heating and pressurization and fixed on the recording medium.
  • energy saving at the time of fixing and downsizing of the fixing device are required.
  • a toner that can be satisfactorily fixed to a recording medium while suppressing heating and pressurization of the fixing roller is desired.
  • thermosetting resin has a very high hardness, a high fixing temperature or fixing load is required. As a result, the cost may increase.
  • Patent Document 1 a toner whose surface is coated with a relatively flexible urea resin among thermosetting resins has been proposed.
  • Patent Document 2 a toner in which a toner core is covered with a shell layer containing a thermosetting resin and provided with fine through holes has been proposed.
  • the capsule toner described in Patent Document 2 since the shell layer from which the through-hole has been broken is easily broken, heating and pressurization during fixing can be reduced.
  • the toner described in Patent Document 2 since the material contained in the toner core oozes out from the fine through-holes, the toner particles may agglomerate when stored at a high temperature. is there. That is, the heat resistant storage stability may be inferior.
  • the present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to have a sufficiently low fixing temperature and fixing load (fixing pressure) even if the surface is coated with a hard thermosetting resin. It is an object of the present invention to provide a toner for developing an electrostatic latent image that can achieve the above fixing. Furthermore, an object of the present invention is to provide a method for producing the toner for developing an electrostatic latent image.
  • the electrostatic latent image developing toner of the present invention includes a plurality of toner particles.
  • Each of the plurality of toner particles contains a toner core containing a binder resin and a shell layer covering the surface of the toner core.
  • the shell layer contains a thermosetting resin and a wax.
  • the method for producing a toner for developing an electrostatic latent image of the present invention includes a forming step of forming a shell layer so as to cover the surface of the toner core containing the binder resin.
  • the forming step includes a wax dispersion preparing step for preparing a dispersion containing wax, a shell layer forming solution preparing step for preparing a shell layer forming solution containing the above dispersion, and a thermosetting on the surface of the toner core.
  • an electrostatic latent that can achieve fixing at a sufficiently low fixing temperature and fixing load (fixing pressure) even though the surface is covered with a shell layer containing a thermosetting resin having high hardness.
  • An image developing toner can be provided.
  • FIG. 3 is a diagram illustrating a toner for developing an electrostatic latent image according to an exemplary embodiment. It is a figure explaining how to read the softening point Tm of binder resin. It is a figure which shows the toner for electrostatic latent image development of another aspect of this embodiment. It is a figure which shows the toner for electrostatic latent image development of another aspect of this embodiment. It is a figure which shows the toner for electrostatic latent image development of another aspect of this embodiment.
  • the electrostatic latent image developing toner of the present embodiment (hereinafter also simply referred to as toner) includes a plurality of toner particles.
  • Each of the plurality of toner particles contains a toner core containing a binder resin and a shell layer that covers the surface of the toner core.
  • the shell layer contains a thermosetting resin and a wax.
  • the toner core exhibits an anionic property (negative charging property), and the shell layer exhibits a cationic property (positive charging property).
  • the electrostatic latent image developing toner 1 (hereinafter also simply referred to as toner 1) includes a plurality of toner particles 2.
  • Each of the plurality of toner particles 2 includes a toner core 3 and a shell layer 4.
  • a shell layer 4 is formed so as to cover the surface of the toner core 3.
  • the shell layer 4 contains a wax 5 and a thermosetting resin.
  • the particle size of the wax 5 is larger than the thickness of the shell layer 4, and protrudes from the toner core 3 from the surface of the shell layer 4 where the wax 5 is not present in a state where the wax 5 is covered with the shell layer 4.
  • the shell layer 4 contains a thermosetting resin having a high hardness, the toner 1 is excellent in aggregation resistance, transportability, and storage stability.
  • the electrostatic latent image developing toner 1 of this embodiment is supplied to a recording medium and heat and a load are applied, the shell layer 4 is destroyed. Then, due to the destruction of the shell layer 4, the toner core 3 exposed on the surface of the toner particles 2 is melted or softened and fixed to the recording medium.
  • the wax 5 expands due to heat at the time of fixing, and becomes a starting point of destruction. Therefore, although the surface is covered with the shell layer 4, the shell layer 4 can be easily broken. As a result, it is possible to satisfactorily fix the toner particles 2 to the recording medium while sufficiently reducing the temperature and load when fixing to the recording medium.
  • the toner core 3 contains a binder resin as an essential component.
  • the binder resin has an anionic property.
  • the binder resin preferably has, for example, an ester group, a hydroxyl group, a carboxyl group, an amino group, an ether group, an acid group, or a methyl group as a functional group in order to have an anionic property.
  • the binder resin is preferably a resin having a functional group such as a hydroxyl group, a carboxyl group, or an amino group in the molecule, and more preferably a resin having a hydroxyl group and / or a carboxyl group in the molecule. This is because such a functional group chemically reacts with a thermosetting component (for example, methylol melamine) contained in the shell layer. As a result, in the toner 1, the shell layer 4 and the toner core 3 are firmly bonded.
  • a thermosetting component for example, methylol melamine
  • the acid value of the binder resin is preferably 3 mgKOH / g or more and 50 mgKOH / g or less in order to have a sufficient anionic property, and 10 mgKOH / g or more and 40 mgKOH / g or less. It is more preferable that
  • the hydroxyl value of the binder resin is preferably 10 mgKOH / g or more and 70 mgKOH / g or less, and 15 mgKOH / g or more and 50 mgKOH / g or less in order to have sufficient anionic property. More preferably.
  • the binder resin include thermoplastic resins (for example, styrene resin, acrylic resin, styrene acrylic resin, polyethylene resin, polypropylene resin, vinyl chloride resin, polyester resin, polyamide resin, polyurethane resin, polyvinyl alcohol resin). Vinyl ether resin, N-vinyl resin, or styrene-butadiene resin).
  • a styrene acrylic resin or a polyester resin is preferable in order to improve the dispersibility of the colorant in the toner, the chargeability of the toner, and the fixing property to the recording medium.
  • the styrene acrylic resin is a copolymer of a styrene monomer and an acrylic monomer.
  • Specific examples of the styrene monomer include styrene, ⁇ -methylstyrene, p-hydroxystyrene, m-hydroxystyrene, vinyltoluene, ⁇ -chlorostyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene. Or p-ethylstyrene.
  • acrylic monomer examples include (meth) acrylic acid; (meth) acrylic acid alkyl ester (methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, (meth) ) Iso-propyl acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, (meth ) N-butyl acrylate or iso-butyl (meth) acrylate); (meth) acrylic acid hydroxyalkyl ester (2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, (meth) 2-hydroxypropyl acrylate or 4-hydroxypropyl (meth) acrylate).
  • acrylic acid and methacrylic acid may be
  • a monomer having a hydroxyl group for example, p-hydroxystyrene, m-hydroxystyrene, or (meth) acrylic acid hydroxyalkyl ester
  • a hydroxyl group for example, p-hydroxystyrene, m-hydroxystyrene, or (meth) acrylic acid hydroxyalkyl ester
  • a carboxyl group can be introduced into the styrene acrylic resin by using (meth) acrylic acid as a monomer.
  • the acid value of the styrene acrylic resin can be adjusted by appropriately adjusting the amount of (meth) acrylic acid used.
  • the polyester resin can be obtained by condensation polymerization or cocondensation polymerization of a divalent or trivalent or higher alcohol component and a divalent or trivalent or higher carboxylic acid component.
  • divalent alcohol component examples include diols (for example, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1 , 4-butenediol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, dipropylene glycol, polyethylene glycol, polypropylene glycol, or polytetramethylene glycol), or bisphenols (for example, Bisphenol A, hydrogenated bisphenol A, polyoxyethylenated bisphenol A, or polyoxypropylenated bisphenol A).
  • diols for example, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol,
  • trivalent or higher alcohol component examples include sorbitol, 1,2,3,6-hexanetetrol, 1,4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, 1,2,4-butanetriol. 1,2,5-pentanetriol, glycerol, diglycerol, 2-methylpropanetriol, 2-methyl-1,2,4-butanetriol, trimethylolethane, trimethylolpropane, or 1,3,5-triol Hydroxymethylbenzene is mentioned.
  • divalent carboxylic acid component examples include maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, and azelaic acid.
  • alkyl (or alkenyl) succinic acid eg, n-butyl succinic acid, n-butenyl succinic acid, isobutyl succinic acid, isobutenyl succinic acid, n-octyl succinic acid, n-octenyl succinic acid, n-dodecyl succinic acid
  • Acid n-dodecenyl succinic acid, isododecyl succinic acid, or isododecenyl succinic acid).
  • Examples of the trivalent or higher carboxylic acid component include 1,2,4-benzenetricarboxylic acid (trimellitic acid), 1,2,5-benzenetricarboxylic acid, 2,5,7-naphthalenetricarboxylic acid, 1,2 , 4-Naphthalenetricarboxylic acid, 1,2,4-butanetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methyl-2-methylenecarboxypropane, 1,2,4- Examples include cyclohexanetricarboxylic acid, tetra (methylenecarboxyl) methane, 1,2,7,8-octanetetracarboxylic acid, pyromellitic acid, or empole trimer acid.
  • These carboxylic acid components may be used as ester-forming derivatives (for example, acid halides, acid anhydrides, or lower alkyl esters).
  • “lower alkyl” means an al
  • the adjustment of the acid value and the hydroxyl value of the polyester resin is carried out by adjusting the amount of the divalent or trivalent or higher alcohol component and the amount of the divalent or trivalent or higher carboxylic acid component, respectively, when producing the polyester resin. This can be done by changing as appropriate. Moreover, when the molecular weight of the polyester resin is increased, the acid value and hydroxyl value of the polyester resin tend to decrease.
  • the number average molecular weight Mn of the polyester resin is preferably 1200 or more and 2000 or less in order to improve the strength of the toner core 3 and the fixing property of the electrostatic latent image developing toner 1.
  • the molecular weight distribution of the polyester resin is preferably 9 or more and 20 or less for the same reason as described above.
  • the number average molecular weight Mn of the styrene acrylic resin is preferably 2000 or more and 3000 or less in order to improve the strength of the toner core 3 and the fixability of the toner 1.
  • the molecular weight distribution (mass average molecular weight Mw / number average molecular weight Mn) of the styrene acrylic resin is preferably 10 or more and 20 or less for the same reason as described above.
  • the number average molecular weight Mn and the mass average molecular weight Mw of the binder resin can be measured using gel permeation chromatography.
  • the glass transition point Tg of the binder resin is preferably equal to or lower than the curing start temperature of the thermosetting resin contained in the shell layer 4 in order to improve the low-temperature fixability.
  • the glass transition point Tg of the binder resin is preferably 20 ° C. or higher, more preferably 30 ° C. or higher and 55 ° C. or lower, and further preferably 30 ° C. or higher and 50 ° C. or lower.
  • the glass transition point Tg of the binder resin is 20 ° C. or more, the aggregation of the toner core 3 during the formation of the shell layer 4 can be suppressed.
  • the hardening start temperature of a thermosetting resin is about 55 degreeC.
  • the glass transition point Tg of the binder resin can be obtained from the change point of the specific heat of the binder resin using a differential scanning calorimeter (DSC). More specifically, a differential scanning calorimeter (for example, “DSC-6200” manufactured by Seiko Instruments Inc.) is used as a measuring apparatus, and the glass transition point Tg of the binder resin is measured by measuring the endothermic curve of the binder resin. Can be requested. Specifically, 10 mg of a measurement sample is put in an aluminum pan, an empty aluminum pan is used as a reference, and the endothermic curve of the binder resin is measured under the conditions of a measurement temperature range of 25 ° C. to 200 ° C. and a temperature increase rate of 10 ° C./min. And obtaining the glass transition point Tg of the binder resin based on this endothermic curve.
  • DSC differential scanning calorimeter
  • the softening point Tm of the binder resin is preferably 100 ° C. or less, and more preferably 95 ° C. or less. When the softening point Tm is 100 ° C. or lower, sufficient low-temperature fixability can be achieved even during high-speed fixing. In order to adjust the softening point Tm of the binder resin, for example, a plurality of binder resins having different softening points Tm may be combined.
  • a Koka type flow tester for example, “CFT-500D” manufactured by Shimadzu Corporation
  • a measurement sample is set on a Koka type flow tester, and a 1 cm 3 sample is measured under predetermined conditions (die pore diameter 1 mm, plunger load 20 kg / cm 2 , heating rate 6 ° C./min). It melts and flows out to obtain an S-shaped curve (that is, an S-shaped curve related to temperature (° C.) / Stroke (mm)), and the softening point Tm of the binder resin is read from the S-shaped curve.
  • the maximum stroke value is S1
  • the baseline stroke value lower than the temperature of S1 is S2.
  • the temperature at which the stroke value in the S-shaped curve is (S1 + S2) / 2 is defined as the softening point Tm of the measurement sample (binder resin).
  • the electrostatic latent image developing toner 1 will be described with reference to FIG.
  • the toner core 3 can contain a known pigment or dye as a colorant in accordance with the color of the toner 1.
  • the black colorant include carbon black.
  • a colorant that is toned to black using a colorant such as a yellow colorant, a magenta colorant, or a cyan colorant, which will be described later, can also be used as the black colorant.
  • examples of the colorant contained in the toner core 3 include a yellow colorant, a magenta colorant, and a cyan colorant.
  • yellow colorant examples include condensed azo compounds, isoindolinone compounds, anthraquinone compounds, azo metal complexes, methine compounds, and allylamide compounds.
  • C.I. I. Pigment Yellow (3, 12, 13, 14, 15, 17, 62, 74, 83, 93, 94, 95, 97, 109, 110, 111, 120, 127, 128, 129, 147, 151, 154, 155 168, 174, 175, 176, 180, 181, 191, or 194)
  • Neftol Yellow S Hansa Yellow G
  • C.I. I. Bat yellow is mentioned.
  • magenta colorant examples include condensed azo compounds, diketopyrrolopyrrole compounds, anthraquinone compounds, quinacridone compounds, basic dye lake compounds, naphthol compounds, benzimidazolone compounds, thioindigo compounds, and perylene compounds.
  • cyan colorant examples include copper phthalocyanine compounds, copper phthalocyanine derivatives, anthraquinone compounds, and basic dye lake compounds. Specifically, C.I. I. Pigment blue (1, 7, 15, 15: 1, 15: 2, 15: 3, 15: 4, 60, 62, or 66), phthalocyanine blue, C.I. I. Bat Blue, or C.I. I. Acid blue.
  • the content of the colorant in the toner core 3 is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 3 parts by mass or more and 7 parts by mass or less with respect to 100 parts by mass of the binder resin.
  • the toner core 3 contains a release agent for the purpose of improving the low temperature fixability of the electrostatic latent image developing toner 1 and suppressing offset or image smearing (stain around the image when the image is rubbed). Also good.
  • mold release agents include aliphatic hydrocarbon waxes (eg, low molecular weight polyethylene, low molecular weight polypropylene, polyolefin copolymers, polyolefin wax, microcrystalline wax, paraffin wax, or Fischer-Tropsch wax), aliphatic hydrocarbons Oxides of waxes (eg, oxidized polyethylene wax or block copolymer of oxidized polyethylene wax), plant waxes (eg, candelilla wax, carnauba wax, wood wax, jojoba wax, or rice wax), animal systems Waxes (eg, beeswax, lanolin, or spermaceti), mineral waxes (eg, ozokerite, ceresin, or petrolatum), waxes based
  • the content of the release agent is preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the binder resin.
  • the content of the release agent is 1 part by mass or more, the occurrence of offset and image smearing during image formation can be satisfactorily suppressed.
  • the content of the release agent is 10 parts by mass or less, when the manufactured toner core 3 is temporarily stored, the toner core 3 is not fused and stored until the shell layer 4 is formed. Stability can be maintained.
  • the toner core 3 may contain a charge control agent as necessary. By containing the charge control agent, it is possible to improve the stability of the charge level and the charge rising characteristics, and to obtain a toner having excellent durability and stability.
  • the charge rising characteristic is an index as to whether or not a predetermined charge level can be charged in a short time. Since the toner core 3 is anionic (negatively charged), a negatively chargeable charge control agent is used.
  • the toner core 3 may contain magnetic powder as necessary.
  • the electrostatic latent image developing toner 1 including the toner particle 2 is used as a magnetic one-component developer.
  • suitable magnetic powders include iron (eg, ferrite or magnetite), ferromagnetic metals (eg, cobalt or nickel, etc.), alloys containing iron and / or ferromagnetic metals, iron and / or ferromagnetic metals. Examples thereof include a compound, a ferromagnetic alloy subjected to ferromagnetization treatment such as heat treatment, or chromium dioxide.
  • the particle size of the magnetic powder is preferably 0.1 ⁇ m or more and 1.0 ⁇ m or less, and more preferably 0.1 ⁇ m or more and 0.5 ⁇ m or less.
  • the particle size of the magnetic powder is 0.1 ⁇ m or more and 1.0 ⁇ m or less, it is easy to uniformly disperse the magnetic powder in the binder resin.
  • the content of the magnetic powder is preferably 35 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the total amount of toner 1. It is more preferable that the amount be no less than 60 parts by mass.
  • the shell layer 4 contains a thermosetting resin as an essential component.
  • the thermosetting resin has sufficient strength, hardness, and cationic property.
  • the thermosetting resin includes a unit in which a methylene group (—CH 2 —) derived from formaldehyde is introduced into a monomer such as melamine.
  • thermosetting resins examples include melamine resin, urea resin (for example, urea resorcin resin), guanamine resin, urethane resin, amide resin, olefin resin, or gelatin / gum arabic resin.
  • a melamine resin or a urea resin is preferable because it is not necessary to greatly increase the fixing temperature.
  • the melamine resin is a polycondensate of melamine and formaldehyde, and the monomer used to form the melamine resin is melamine.
  • Urea resin is a polycondensate of urea and formaldehyde, and the monomer used to form the urea resin is urea.
  • Melamine or urea may have undergone well-known modification.
  • the shell layer 4 may contain a resin other than the thermosetting resin as necessary as long as the effect of the present embodiment is not impaired.
  • the content of the thermosetting resin in the shell layer 4 is preferably 50% by mass or more, and more preferably 70% by mass or more with respect to the total amount of the shell layer 4.
  • the shell layer 4 has sufficient hardness
  • the content of the thermosetting resin is 70% by mass or more, the shell layer 4 is Furthermore, it has sufficient hardness.
  • the shell layer 4 preferably contains nitrogen atoms derived from melamine or urea.
  • the content of nitrogen atoms in the shell layer 4 is preferably 10% by mass or more.
  • the thickness of the shell layer 4 is, for example, 5 nm or more and 80 nm or less.
  • the thickness of the shell layer 4 is measured, for example, by analyzing a cross-sectional TEM image of the electrostatic latent image developing toner 1 using commercially available image analysis software (for example, “WinROOF” manufactured by Mitani Corporation). it can.
  • the wax 5 will be described below.
  • the wax 5 becomes a starting point of the destruction of the shell layer 4, so that the shell layer 4 can be easily broken by heating and pressurization, and as a result, the temperature and load at the time of fixing are reduced. Can be low enough.
  • the content of the wax 5 in the shell layer 4 is preferably 1.0% by mass or more and 25% by mass or less, and more preferably 5.0% by mass or more and 25% by mass or less with respect to the total amount of the shell layer 4. More preferred.
  • the content of the wax 5 in the shell layer 4 is 1.0% by mass or more, the shell layer 4 is easily broken when the wax 5 becomes a starting point of the destruction of the shell layer 4. Temperature and load can be lowered sufficiently.
  • the content of the wax 5 in the shell layer 4 is 25% by mass or less, the aggregation of the toner particles 2 when the electrostatic latent image developing toner 1 is stored at a high temperature can be suppressed. Heat resistant storage stability can be improved.
  • the wax 5 is not particularly limited as long as it expands when heated.
  • the same wax as the release agent that can be contained in the toner core 3 can be used.
  • the wax 5 is preferably an ester wax or carnauba wax because it expands easily and has excellent versatility.
  • the wax 5 may have a particle shape.
  • the particle diameter is preferably 10 nm or more and 150 nm or less, more preferably 20 nm or more and 120 nm or less, and further preferably 50 nm or more and 100 nm or less.
  • the particle size of the wax is 50 nm or more, the shell 5 is easily destroyed by the wax 5 being the starting point of the destruction of the shell layer 4, so that the temperature and load during fixing can be sufficiently lowered.
  • the particle diameter of the wax is 100 nm or less, aggregation of the toner particles 2 when the electrostatic latent image developing toner 1 is stored at a high temperature can be suppressed, and the heat resistant storage stability of the toner 1 can be improved.
  • the shell layer 4 may contain a charge control agent. Since the shell layer 4 is cationic (positively chargeable), it can contain a positively chargeable charge control agent.
  • FIG. 3 shows an electrostatic latent image developing toner 6 according to another embodiment.
  • the electrostatic latent image developing toner 6 includes a plurality of toner particles 7.
  • Each of the plurality of toner particles 7 includes a toner core 3 and a shell layer 4.
  • the shell layer 4 contains a thermosetting resin and a wax 5.
  • the thickness of the shell layer 4 is larger than the particle size of the wax 5.
  • the wax 5 is present uniformly in the shell layer 4 in contact with the surface of the toner core 3.
  • FIG. 4 shows an electrostatic latent image developing toner 8 according to another embodiment.
  • the electrostatic latent image developing toner 8 includes a plurality of toner particles 9.
  • Each of the plurality of toner particles 9 includes a toner core 3 and a shell layer 4.
  • the shell layer 4 contains a thermosetting resin and a wax 5.
  • the wax 5 is uniformly present in the shell layer 4 while being separated from the surface of the toner core 3.
  • FIG. 5 shows an electrostatic latent image developing toner 10 according to another embodiment.
  • the electrostatic latent image developing toner 10 includes a plurality of toner particles 12.
  • Each of the plurality of toner particles 12 includes a toner core 3 and a shell layer 4.
  • the shell layer 4 contains a thermosetting resin and a wax 5.
  • the toner particles 12 are obtained by externally treating the surface of the shell layer 4 with the external additive 11 with respect to the toner particles 2 in order to improve fluidity and handleability.
  • the method for obtaining the toner particles 12 by performing an external addition process on the toner particles 2 using the external additive 11 is not particularly limited, and a known method is used. Specifically, the external additive conditions are adjusted so that the external additive 11 is not completely buried in the shell layer 4, and the external additive is added using a mixer (for example, FM mixer or Nauter mixer (registered trademark)). Processing is performed.
  • a mixer for example, FM mixer or Nauter mixer (registered trademark)
  • Examples of the external additive 11 include fine particles of silica fine particles or metal oxides (for example, alumina, titanium oxide, magnesium oxide, zinc oxide, strontium titanate, or barium titanate).
  • the particle diameter of the external additive 11 is preferably 0.01 ⁇ m or more and 1.0 ⁇ m or less in order to improve fluidity and handling properties.
  • the toner particles 2 (toner particles including the toner core 3, the shell layer 4, and the wax 5) before being processed by the external additive 11 may be referred to as “toner mother particles”.
  • the amount of the external additive 11 used is preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the toner base particles in order to improve fluidity and handling properties. The following is more preferable.
  • the electrostatic latent image developing toner has been described above with reference to FIGS.
  • the electrostatic latent image developing toner may be used as a so-called one-component developer further containing, for example, ferrite or magnetite magnetic powder. Alternatively, it may be mixed with a desired carrier and used as a so-called two-component developer.
  • the carrier is preferably a magnetic carrier.
  • a carrier core material such as iron or magnetite coated with a resin can be used.
  • the resin that coats the carrier core material examples include (meth) acrylic polymers, styrene polymers, styrene- (meth) acrylic copolymers, olefin polymers (eg, polyethylene, chlorinated polyethylene, or Polypropylene), polyvinyl chloride, polyvinyl acetate, polycarbonate resin, cellulose resin, polyester resin, unsaturated polyester resin, polyamide resin, polyurethane resin, epoxy resin, silicone resin, fluororesin (eg, polytetrafluoroethylene, polychlorotri Fluoroethylene or polyvinylidene fluoride), phenol resin, xylene resin, diallyl phthalate resin, polyacetal resin, or amino resin. These can be used alone or in combination of two or more.
  • the resin covering the carrier core material is preferably a silicone resin.
  • the ratio of the resin covering the carrier core material is preferably 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the carrier core material.
  • the particle size of the carrier is preferably 20 ⁇ m or more and 120 ⁇ m or less, and more preferably 25 ⁇ m or more and 80 ⁇ m or less.
  • the particle size of the carrier can be measured with an electron microscope.
  • the usage amount of the electrostatic latent image developing toner is 5% by mass or more and 20% by mass or less with respect to the total amount of the two-component developer. It is preferable that it is 5 mass% or more and 12 mass% or less.
  • the manufacturing method of the electrostatic latent image developing toner 1 of the present embodiment includes a forming step of forming the shell layer 4 so as to cover the surface of the toner core 3 containing the binder resin.
  • a preparatory step of preparing the toner core 3 including the binder resin may be included.
  • components other than the binder resin for example, a colorant, a charge control agent, a release agent, or a magnetic powder
  • a colorant for example, a colorant, a charge control agent, a release agent, or a magnetic powder
  • examples of the method for executing the preparation step include a melt-kneading method or a polymerization method.
  • the melt-kneading method is performed as follows. First, the binder resin and components other than the binder resin are mixed as necessary to obtain a mixture. Then, the obtained mixture is melt-kneaded, and the obtained melt-kneaded product is pulverized by a known method to obtain a pulverized product. The obtained pulverized product is classified by a known method to obtain a toner core 3 having a desired particle size.
  • Examples of the polymerization method include the following methods. That is, a melt-kneaded material obtained in the same manner as in the melt-kneading method is atomized in the air using, for example, a disk or a multi-fluid nozzle to obtain the toner core 3; the toner core 3 is directly generated using the suspension polymerization method.
  • Dispersion polymerization method in which the toner core 3 is directly formed using an aqueous organic solvent in which the monomer is soluble but the resulting polymer is insoluble; direct polymerization in the presence of a water-soluble polar polymerization initiator
  • An emulsion polymerization method such as a so-called soap-free polymerization method for producing the toner core 3; or a hetero-aggregation method in which primary polar emulsion polymer particles are prepared, and then polar particles having opposite charges are added and associated with each other.
  • the forming step is a step of forming the shell layer 4 so as to cover the surface of the toner core 3.
  • the forming step includes a wax dispersion preparing step, a shell layer forming solution preparing step, a supplying step, and a resinification step.
  • a dispersion containing the wax 5 (wax dispersion) is prepared.
  • a shell layer forming liquid preparation step a shell layer forming liquid is prepared.
  • the shell layer forming liquid contains a wax dispersion and a polymer and / or prepolymer of a thermosetting resin.
  • the supplying step the shell layer forming liquid is supplied to the surface of the toner core 3.
  • the resinification step the polymer and / or prepolymer of the thermosetting resin is resinized.
  • the wax dispersion is prepared by mixing the wax 5 with an arbitrary solvent and various additives (for example, a surfactant) as required, and mixing with stirring as appropriate.
  • a surfactant for example, a surfactant
  • the kind of solvent is not specifically limited, For example, toluene, acetone, methyl ethyl ketone, tetrahydrofuran, or water is mentioned.
  • the wax dispersion obtained in the wax dispersion preparation step is added to the mixture of the thermosetting resin monomer and / or the prepolymer and the solvent, and the mixture is appropriately stirred. What is necessary is just to mix. It is preferable to adjust the pH to about 4 during the stirring and mixing.
  • the monomer of the above thermosetting resin is appropriately selected. Further, the prepolymer of the thermosetting resin is in a state before the polymer in which the degree of polymerization of the monomer of the thermosetting resin is increased to some extent, and is also referred to as an initial polymer or an initial condensate.
  • the shell layer forming liquid may contain a known dispersant in order to improve the dispersibility of the thermosetting resin monomer and / or prepolymer in the solvent.
  • the content of the dispersant in the shell layer forming liquid is, for example, 0.1% by mass or more and 15% by mass or less. Dispersibility can be satisfactorily expressed when the content of the dispersant in the shell layer forming liquid is 0.1% by mass or more. On the other hand, when the content of the dispersant in the shell layer forming liquid is 15% by mass or less, the environmental load due to the dispersant can be reduced.
  • the dispersant can be removed by a process such as washing after the electrostatic latent image developing toner 1 of the present embodiment is manufactured.
  • the shell layer forming liquid is supplied to the toner core 3.
  • the method of performing the supplying step include a method of spraying a shell layer forming liquid on the surface of the toner core 3 or a method of immersing the toner core 3 in the shell layer forming liquid.
  • the shell layer forming liquid may be diluted with the above-mentioned arbitrary solvent.
  • the monomer and / or prepolymer of the thermosetting resin contained in the shell layer forming liquid is resinized by arbitrary polymerization or condensation to form a thermosetting resin.
  • the shell layer 4 is formed on the surface of the toner core 3.
  • Resinification includes not only complete resinization with a sufficiently high degree of polymerization but also partial resination with a medium degree of polymerization.
  • the temperature during the resinification step is preferably maintained in the range of 40 ° C. or higher and 90 ° C. or lower, and more preferably maintained in the range of 50 ° C. or higher and 80 ° C. or lower.
  • the temperature is preferably maintained in the range of 40 ° C. or higher and 90 ° C. or lower, and more preferably maintained in the range of 50 ° C. or higher and 80 ° C. or lower.
  • the manufacturing method of this embodiment has been described above.
  • the electrostatic latent image developing toner after the resinification step is subjected to at least one step selected from a cleaning step, a drying step, and an external addition step as necessary. You may pass.
  • the electrostatic latent image developing toner 1 obtained by executing the forming step is washed with, for example, water.
  • the washed electrostatic latent image developing toner 1 is dried by a dryer (for example, a spray dryer, a fluidized bed dryer, a vacuum freeze dryer, or a vacuum dryer).
  • a spray dryer is preferably used because aggregation of the toner particles 2 contained in the electrostatic latent image developing toner 1 during drying is easily suppressed.
  • the dispersion liquid in which the external additive 11 for example, silica fine particles
  • the external addition process described later can be performed simultaneously.
  • the external additive 11 is attached to the surface of the toner particles 2.
  • the external additive conditions are adjusted so that the external additive 11 is not completely buried in the surface of the shell layer 4, and a mixer (for example, FM mixer or Nauter mixer ( (Registered trademark)) and the electrostatic latent image developing toner 1 and the external additive 11 are mixed to produce the electrostatic latent image developing toner 10.
  • a mixer for example, FM mixer or Nauter mixer ( (Registered trademark)
  • the electrostatic latent image developing toner 1 and the external additive 11 are mixed to produce the electrostatic latent image developing toner 10.
  • the toner for developing an electrostatic latent image of the present embodiment has a fixing temperature higher than that in the case of using the toner for developing an electrostatic latent image including toner particles in which the shell layer 4 not containing the wax 5 is formed. It can be lowered sufficiently. As a result, since the load due to heat is reduced, it is possible to improve the durability of the recording medium, and it is possible to suppress deterioration and cost increase of members constituting the fixing device.
  • Wax Dispersion B Ester wax (“WEP-3” manufactured by NOF Corporation) was used as the wax. 40 parts by mass of ester wax, 1 part by mass of sodium dodecylbenzenesulfonate as an anionic surfactant, and 59 parts by mass of ion-exchanged water were put into a stirring device equipped with stirring blades. This was heated to 90 ° C. with stirring, and then emulsified with a homogenizer (“Ultra Tarrax T50” manufactured by IKA) for 5 minutes. Thereafter, emulsification was performed at 100 ° C. using a gorin homogenizer (“15M-8TA type” manufactured by APV) to prepare wax dispersion B. When the particle size of the wax in the wax dispersion B was measured with a laser diffraction / scattering particle size distribution analyzer (“LA-950V” manufactured by Horiba, Ltd.), the average volume particle size was 20 nm.
  • LA-950V laser diffraction / scattering particle
  • Wax Dispersion D An ester wax (“WEP-3” manufactured by NOF Corporation) was used as a wax. 40 parts by mass of ester wax, 0.2 part by mass of sodium dodecylbenzenesulfonate as an anionic surfactant, and 59.8 parts by mass of ion-exchanged water were put into a stirring device equipped with a blade. The mixture was heated to 90 ° C. with stirring, and then emulsified with a homogenizer (“Ultra Turrax T50” manufactured by IKA) for 5 minutes. Thereafter, emulsification was performed at 90 ° C. using a gorin homogenizer (“15M-8TA type” manufactured by APV) to prepare wax dispersion D. When the particle size of the wax in the wax dispersion D was measured with a laser diffraction / scattering particle size distribution analyzer (“LA-950V” manufactured by Horiba, Ltd.), the average volume particle size was 120 nm.
  • LA-950V laser dif
  • Carnauba wax (“Carnauba Wax No. 1” manufactured by Kato Yoko Co., Ltd.) was used as the wax. 40 parts by mass of carnauba wax, 0.5 part by mass of sodium dodecylbenzenesulfonate as an anionic surfactant, and 59.5 parts by mass of ion-exchanged water were charged into a stirring apparatus equipped with stirring blades. While stirring, the mixture was heated to 90 ° C. and then emulsified with a homogenizer (“Ultra Turrax T50” manufactured by IKA) for 5 minutes. Thereafter, emulsification was performed at 90 ° C.
  • a homogenizer (“Ultra Turrax T50” manufactured by IKA)
  • wax dispersion E was prepared using a gorin homogenizer (“15M-8TA type” manufactured by APV) to prepare wax dispersion E.
  • 15M-8TA type manufactured by APV
  • LA-950V laser diffraction / scattering particle size distribution analyzer
  • Shell Layer Forming Liquid B 100 parts by mass of an aqueous methylolmelamine solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 22.3 parts by mass of wax dispersion A (solid content of 8. 9 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade to form shell layer forming solution B (wax in the shell in the solid content) Content: 10% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer-Forming Liquid C 100 parts by mass of an aqueous methylolmelamine solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 66.7 parts by mass of wax dispersion A (solid content of 26. 7 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade, and a shell layer forming liquid C (wax in shell in solid content) Content: 25% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer Forming Liquid D 100 parts by mass of a methylolmelamine aqueous solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 74.0 parts by mass of wax dispersion A (solid content 29.29%). 6 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade to form shell layer forming solution D (wax in the shell in the solid content) Content: 27% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer Forming Liquid E 100 parts by mass of an aqueous methylolmelamine solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 22.3 parts by mass of wax dispersion B (solid content: 8. 9 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade, and a shell layer forming solution E (wax in the shell in the solid content) Content: 10% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer-Forming Liquid F 100 parts by mass of an aqueous methylolmelamine solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 22.3 parts by mass of wax dispersion C (solid content of 8. 9 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade, and the shell layer forming solution F (the wax in the shell in the solid content) Content: 10% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer-Forming Liquid G 100 parts by mass of a methylolmelamine aqueous solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 22.3 parts by mass of wax dispersion D (solid content of 8. 9 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade, and a shell layer forming solution G (wax in shell in solid content) Content: 10% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Shell Layer Forming Liquid H 100 parts by mass of a methylolmelamine aqueous solution (“Milben 607” manufactured by Showa Denko KK, solid content concentration: 80% by mass) and 22.3 parts by mass of wax dispersion E (solid content of 8. 9 parts by mass). This was put into a beaker and stirred for 30 minutes at 300 rpm using a mechanically controlled stirrer (“RW20 Digital” manufactured by IKA) and a stirring blade, and the shell layer forming liquid H (wax in the shell in the solid content) Content: 10% by mass).
  • RW20 Digital mechanically controlled stirrer
  • Example 1 (Preparation of toner core) A polyester resin as a binder resin was prepared. Regarding the physical properties of this polyester resin, the acid value was 40 mgKOH / g, the hydroxyl value was 20 mgKOH / g, the softening point Tm was 100 ° C., and the glass transition point Tg was 48 ° C. 100 parts by mass of this polyester resin, 5 parts by mass of a colorant (CI Pigment Blue 15: 3 type (copper phthalocyanine)), and ester wax as a release agent (“WEP-3” manufactured by NOF Corporation) ) 5 parts by mass were mixed and mixed with an FM mixer.
  • a colorant CI Pigment Blue 15: 3 type (copper phthalocyanine)
  • WEP-3 ester wax as a release agent
  • the obtained mixture was melt-kneaded with a twin screw extruder (“PCM-30” manufactured by Ikegai Co., Ltd.).
  • the obtained melt-kneaded product is pulverized with a mechanical pulverizer (“Turbo Mill” manufactured by Freund Turbo Co., Ltd.), then classified with a classifier (“Elbow Jet” manufactured by Nittetsu Mining Co., Ltd.), and a volume average particle size of 6 ⁇ m.
  • a toner core having a diameter was obtained.
  • the toner core had a circularity of 0.93.
  • the toner core had a glass transition point Tg of 49 ° C. and a softening point Tm of 90 ° C.
  • a 1 L three-necked flask was set in a 30 ° C. water bath, and the pH of ion-exchanged water (300 mL) was adjusted to 4 using hydrochloric acid in the flask.
  • ion-exchanged water 6.7 g of the shell layer forming liquid A was added and dissolved, and 300 g of the toner core was added thereto and stirred at a speed of 200 rpm for 1 hour.
  • a wet cake of the toner particles was filtered from the liquid containing the toner particles using a Buchner funnel.
  • the toner particle wet cake was again dispersed in ion exchange water to wash the toner particles.
  • the same washing of the toner particles with ion exchange water was repeated 5 times.
  • the toner particles recovered by filtration were left to dry in a 40 ° C. atmosphere for 48 hours.
  • the electrical conductivity of the filtrate after filtration was 4 ⁇ S / cm.
  • dry silica is added so that the external additive amount of dry silica (“RA200HS” manufactured by Nippon Aerosil Co., Ltd., particle size: 12 ⁇ m) is 0.5 mass% with respect to the total amount of toner particles.
  • the surface of the toner particles was externally added to obtain the electrostatic latent image developing toner of Example 1.
  • Example 2 The electrostatic latent image development of Example 2 was performed in the same manner as in Example 1 except that 7.3 g of shell layer forming liquid B was used instead of 6.7 g of shell layer forming liquid A. Toner was obtained.
  • Example 3 The electrostatic latent image development of Example 3 was performed in the same manner as in Example 1 except that 8.3 g of shell layer forming liquid C was used instead of 6.7 g of shell layer forming liquid A. Toner was obtained.
  • Example 4 The electrostatic latent image development of Example 4 was performed in the same manner as in Example 1 except that 8.4 g of shell layer forming liquid D was used instead of 6.7 g of shell layer forming liquid A. Toner was obtained.
  • Comparative Example 1 The electrostatic latent image developing toner of Comparative Example 1 was obtained in the same manner as in Example 1, except that 6.6 g of Milben 607 was used instead of 6.7 g of the shell layer forming liquid A. It was.
  • Example 5 An electrostatic latent image developing toner of Example 5 was obtained in the same manner as in Example 2, except that the shell layer forming liquid E was used instead of the shell layer forming liquid B.
  • Example 6 An electrostatic latent image developing toner of Example 6 was obtained in the same manner as in Example 2, except that the shell layer forming liquid F was used instead of the shell layer forming liquid B.
  • Example 7 An electrostatic latent image developing toner of Example 7 was obtained in the same manner as in Example 2 except that the shell layer forming liquid G was used instead of the shell layer forming liquid B.
  • Example 8 An electrostatic latent image developing toner of Example 8 was obtained in the same manner as in Example 2, except that the shell layer forming liquid H was used instead of the shell layer forming liquid B.
  • the evaluation method or measurement method of the electrostatic latent image developing toner obtained in the examples and comparative examples is shown below.
  • the following evaluation was performed using a two-component developer.
  • a method for preparing a two-component developer is shown below.
  • Ferrite (“EF-35B” manufactured by Powder Tech Co., Ltd., particle size: 35 ⁇ m) was prepared as a carrier core material.
  • 30 g of polyamideimide resin is diluted with 2 liters of water, 120 g of tetrafluoroethylene / hexafluoropropylene copolymer (FEP) is dispersed therein, and 3 g of silicon oxide is further dispersed therein to form a coating layer forming solution.
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • silicon oxide is further dispersed therein to form a coating layer forming solution.
  • This coating layer forming liquid and 10 kg of the above ferrite were put into a coating apparatus having a fluidized bed, and the coating layer forming liquid was applied to the surface of the ferrite.
  • Minimum fixing temperature (low temperature fixability)
  • a color complex machine (“TASKalfa 5550ci” manufactured by Kyocera Document Solutions Inc.) provided with a fixing device (fixing jig) modified so that the fixing temperature can be adjusted was used.
  • the two-component developer was put into the developing device of the evaluation machine, the toner for developing the electrostatic latent image was put into the toner container of the evaluation machine, and the fixing temperature when the image was output was adjusted. Specifically, the fixing temperature was changed at 5 ° C. increments up to 200 ° C.
  • the fixing conditions in the case of fixing the toner for developing an electrostatic latent image 1.0 mg / cm 2 on a sheet of 90 g / m 2
  • the minimum temperature at which the electrostatic latent image developing toner is satisfactorily fixed is adopted as the minimum fixing temperature.
  • the measurement conditions for the minimum fixing temperature were a speed of 230 mm / second, a nip width of 8 mm, and a nip passage time of 35 msec. A sample having a minimum fixing temperature of 160 ° C. or lower was regarded as acceptable.
  • Table 1 shows the evaluation results of the electrostatic latent image developing toners obtained in Examples 1 to 8 and Comparative Example 1.
  • “-” indicates that the shell layer did not contain wax.
  • the electrostatic latent image developing toners of the present embodiment obtained in Examples 1 to 8 were excellent in low-temperature fixability. Further, Examples 1 to 3, 5, 6 and 8, which are preferred embodiments, were excellent in heat resistant storage stability. On the other hand, the electrostatic latent image developing toner obtained in Comparative Example 1 was inferior in low-temperature fixability because the shell layer contained no wax.
  • the toner for developing an electrostatic latent image of this embodiment is excellent in low-temperature fixability, can obtain a good quality image, and is suitably used for image formation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

La présente invention concerne une encre en poudre pour le développement d'image latente électrostatique (1) qui contient une pluralité de particules d'encre en poudre (2). Chaque particule de la pluralité de particules d'encre en poudre (2) comprend : un noyau d'encre en poudre (3) qui contient une résine liante ; et une couche coque (4) qui recouvre la surface du noyau d'encre en poudre (3). La couche coque (4) contient une résine thermodurcissable et une cire (5). De préférence, la teneur en cire (5) va de 1,0 % en masse à 25 % en masse (inclus) par rapport à la couche coque (4).
PCT/JP2014/074674 2013-10-22 2014-09-18 Encre en poudre pour développement d'image latente électrostatique et procédé de production d'encre en poudre pour un développement d'image latente électrostatique Ceased WO2015060046A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01149062A (ja) * 1987-12-07 1989-06-12 Fujitsu Ltd シリアルプリンタ
JPH07333887A (ja) * 1994-06-08 1995-12-22 Tomoegawa Paper Co Ltd 電子写真用トナーおよびトナーの製造方法
JP2005091706A (ja) * 2003-09-17 2005-04-07 Konica Minolta Business Technologies Inc トナー
JP2005115194A (ja) * 2003-10-10 2005-04-28 Fuji Xerox Co Ltd トナー、トナーの製造方法、画像形成方法、および画像形成装置
JP2009237110A (ja) * 2008-03-26 2009-10-15 Toppan Forms Co Ltd 低温定着性トナーおよびその製造方法
JP2010262111A (ja) * 2009-05-01 2010-11-18 Fuji Xerox Co Ltd 静電写真用トナー、静電写真用現像剤、トナーカートリッジ、プロセスカートリッジおよび画像形成装置
JP2012189698A (ja) * 2011-03-09 2012-10-04 Sharp Corp 定着装置、およびそれを備えた画像形成装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01149062A (ja) * 1987-12-07 1989-06-12 Fujitsu Ltd シリアルプリンタ
JPH07333887A (ja) * 1994-06-08 1995-12-22 Tomoegawa Paper Co Ltd 電子写真用トナーおよびトナーの製造方法
JP2005091706A (ja) * 2003-09-17 2005-04-07 Konica Minolta Business Technologies Inc トナー
JP2005115194A (ja) * 2003-10-10 2005-04-28 Fuji Xerox Co Ltd トナー、トナーの製造方法、画像形成方法、および画像形成装置
JP2009237110A (ja) * 2008-03-26 2009-10-15 Toppan Forms Co Ltd 低温定着性トナーおよびその製造方法
JP2010262111A (ja) * 2009-05-01 2010-11-18 Fuji Xerox Co Ltd 静電写真用トナー、静電写真用現像剤、トナーカートリッジ、プロセスカートリッジおよび画像形成装置
JP2012189698A (ja) * 2011-03-09 2012-10-04 Sharp Corp 定着装置、およびそれを備えた画像形成装置

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