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WO2009072823A2 - Particules de toner et dispositif de formation d'image électrophotographique comprenant celles-ci - Google Patents

Particules de toner et dispositif de formation d'image électrophotographique comprenant celles-ci Download PDF

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Publication number
WO2009072823A2
WO2009072823A2 PCT/KR2008/007171 KR2008007171W WO2009072823A2 WO 2009072823 A2 WO2009072823 A2 WO 2009072823A2 KR 2008007171 W KR2008007171 W KR 2008007171W WO 2009072823 A2 WO2009072823 A2 WO 2009072823A2
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WO
WIPO (PCT)
Prior art keywords
toner particles
group
toner
polyester resin
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2008/007171
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English (en)
Other versions
WO2009072823A3 (fr
Inventor
Woo Young Yang
Keon Il Kim
Dae Il Hwang
Il Hyuk Kim
Jae Bum Park
Il Sun Hwang
Jae Kwang Hwang
Dae Woong Choi
Dong Won Kim
Duck Kyun Ahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lotte Fine Chemical Co Ltd
Original Assignee
Samsung Fine Chemicals Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Fine Chemicals Co Ltd filed Critical Samsung Fine Chemicals Co Ltd
Publication of WO2009072823A2 publication Critical patent/WO2009072823A2/fr
Publication of WO2009072823A3 publication Critical patent/WO2009072823A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08755—Polyesters
    • 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
    • G03G9/0819—Developers with toner particles characterised by the dimensions of the particles
    • 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
    • G03G9/0821—Developers with toner particles characterised by physical parameters
    • 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
    • G03G9/0827—Developers with toner particles characterised by their shape, e.g. degree of sphericity
    • 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
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08793—Crosslinked polymers
    • 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
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08795—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
    • 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
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08797—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature

Definitions

  • the present invention relates to toner particles and an electrophotographic image forming device comprising the toner particles, and more particularly, to toner particles which may simultaneously attain particle characteristics suitable for high speed printing and physical properties such as fixing property, high temperature storage stability, etc., and an electrophotographic image forming device comprising the toner particles.
  • a toner is manufactured by adding a colorant, a charge control agent and/ or a releasing agent to a thermoplastic resin that acts as a binder resin.
  • a thermoplastic resin that acts as a binder resin.
  • an inorganic material such as silica, titanium oxide, and/or a metal powder may be added to the toner as external additives.
  • thermoplastic resin that acts as a binder resin may be polyester resin or vinyl resin.
  • Vinyl resin provides toner particles having a uniform diameter since the vinyl resin is manufactured using a chemical method such as suspension polymerization or emulsion polymerization. However, since the chemical method accompanies a radical polymerization, it is difficult to achieve complete polymerization, and as a result, unreacted monomers or surfactants may remain in the toner particles. Thus, the charge characteristics of the toner particles are reduced due to the unreacted monomers remaining in the toner particles.
  • Polyester resin is suitable for using in a high speed printing toner since the polyester resin has a low melt viscosity and can be readily melted.
  • the conventional toner particles can not meet the physical properties required for high speed printing.
  • toner particles that are manufactured using a pulverization method which is a conventional method of manufacturing a toner, in which a polyester resin is used as the binder resin, have a drawback in that particle size of the toner particles is not uniform.
  • toner particles that are manufactured by a method comprising: mixing a dispersion of a polyester resin and a releasing agent emulsion to form a mixture; and agglomerating the mixture.
  • the toner particles have unsatisfactory fixing property.
  • the present invention provides toner particles having a small volume average diameter, a narrow size distribution, a superior fixing property, and high temperature storage stability.
  • the present invention also provides an electrostatic latent image developing agent that includes the toner particles.
  • the present invention also provides a method of forming an electrophotographic image using the toner particles or the electrostatic latent image developing agent.
  • the present invention also provides an electrophotographic image forming device that includes the toner particles or an electrostatic latent image developing agent.
  • a toner particle including a binder resin and a colorant, wherein the binder resin includes a polyester resin having a weight average molecular weight of about 6,000 to about 100,000, a glass transition temperature of about 55 to about 70 0 C, and polydispersity index Mw/ Mn of about 3 to about 25, and the toner particles have a volume average diameter of about 2 to about 10 ⁇ m and a 80% span value of about 0.9 or less.
  • the binder resin includes a polyester resin having a weight average molecular weight of about 6,000 to about 100,000, a glass transition temperature of about 55 to about 70 0 C, and polydispersity index Mw/ Mn of about 3 to about 25, and the toner particles have a volume average diameter of about 2 to about 10 ⁇ m and a 80% span value of about 0.9 or less.
  • an electrostatic latent image developing agent including toner particles and a carrier.
  • [18] Present invention provides toner particles which may simultaneously attain particle characteristics suitable for high speed printing and physical properties such as fixing property, high temperature storage stability, etc., and an electrophotographic image forming device comprising the toner particles. Best Mode
  • Toner particles according to an embodiment of the present invention include a binder resin and a colorant.
  • the binder resin includes a polyester resin having a weight- average molecular weight of about 6,000 to about 100,000, a g lass transition temperature of about 55 to about 70 0 C, and a polydispersity index Mw/Mn of about 3 to about 25.
  • the toner particles have a volume average diameter of about 2 to about 10 ⁇ m and 80% span value of about 0.9 or less.
  • the volume average diameter of the toner particles exceeds 10 ⁇ m, the size of the toner particles becomes unsuitable for high speed printing due to its increased size. Also, if the 80% span value exceeds 0.9, the non-uniformity of the toner particles is increased, and thus, an incomplete charging of the particle or contamination of the device may occur. In order to prevent these problems, a classifying process should be performed to remove toner particles having a diameter greater than a predetermined size.
  • the 80% span value is about 0.9 or less, and is not specifically limited to, but may be about 0.1 to about 0.9.
  • the polyester resin included in the toner particles may have a content of insolubles about 0.1 to about 20 weight% with respect to a tetrahydrofuran (THF) solvent, preferably, 0.3 to 10 weight%, and more preferably 0.5 to 5 weight%. If the content of insolubles with respect to the THF solvent exceeds 20 weight %, the viscosity of the solution is highly increased because of the presence of the content of insolubles, and if the content of insolubles is less than 0.1 weight%, the high temperature fixing property of the toner particles is deteriorated.
  • THF tetrahydrofuran
  • the toner particles may have a circularity of about 0.92 to about 0.99. If the circularity of the toner particles exceeds 0.99, the toner particles may remain on a photosensitive drum in a cleaning step, and thus, can cause a malfunction of the device, and if the circularity of the toner particles is less than about 0.92, the transfer rate can be reduced, and thus, the rate of toner consumption can be increased.
  • the polyester resin included in the toner particles includes a water dispersible functional group, and may have an acid value of about 4 to about 20 mgKOH/g. In the above acid value range, the toner particles can acquire a rapid charging rate and a large amount of charge.
  • the water dispersible functional group may include a metal salt of at least one selected from the group consisting of a hydroxyl group, a mercapto group, a carboxylic acid group, a phosphoric acid group, a sulfonic acid group, and a sulfuric acid group. More specifically, the water dispersible functional group may be a sodium sulfonate group.
  • the content of dicarboxylic acid residue that includes a sodium sulfonate group may be about 0.05 to about 0.5 mol% based on the total amount of the dicarboxylic acid residue.
  • the content of dicarboxylic acid residue that includes sodium sulfonate group is within the above range, the water dispersibility of the polyester resin can be readily realized, and thus, the reduction of charge amount due to moisture absorption of the toner particles can be prevented even if the toner particles are stored in a high temperature and high humidity environment. Also, since the polyester resin includes the water dispersible functional group, the dispersibility of the polyester resin with respect to a polarized solvent may be increased.
  • the colorant such as a cyan pigment, a magenta pigment, a yellow pigment, a black pigment, a white pigment, or a mixture of these materials, included in the toner particles may be appropriately selected in consideration of hue, chroma, brightness, weather resistance, transparency, or the affinity to a binder resin.
  • the black pigment may be SB4, SB7, SB9, titanium oxide, or carbon black.
  • the cyan pigment may be a copper phthalocyanine compound or derivatives thereof, anthraquin compound, or a basic dye late compound. More specifically, the cyan pigment may be C.I. pigment blue 1,7, 15, 15:1, 15:2, 15:3, 15:4, 60, 62, or 66.
  • the magenta pigment may be a fused nitrogen compound, an anthraquin compound, a quinacridone compound, a basic dye late compound, a napthol compound, a benzoimidazol compound, a thioindigo compound, or a perylene compound.
  • the magenta pigment may be C.I. dye red 2, 3, 5, 6, 7, 23, 48:2, 48:3, 48:4, 57:1, 81:1, 122, 144, 146, 166, 169, 177, 184, 185, 202, 206, 220, 221, or 254.
  • the yellow pigment may be a fused nitrogen compound, a isoindolinone compound, an anthraquin compound, an azo metal complex compound, or an allylimide compound. More specifically, the yellow pigment may be C.I. dye yellow 12, 13, 14, 17, 62, 74, 83, 93, 94, 95, 109, 110, 111, 128, 129, 147, or 168. These pigments may be selected in consideration of color coordinate and/or color density.
  • the content of the colorant is greater than 15 weight% , the elasticity of the toner particles is increased, and as a result, it is difficult to form fine particles or the particle size distribution can be broadened.
  • the content of the colorant may be about 2 to about 15 weight%, and preferably, 4 to 12 weight % based on the total weight of the toner particles.
  • the colorant can be used as it is, but also may be used in a colorant masterbatch type in which the colorant is dispersed in a resin composition. In this way, when the colorant is used in a masterbatch type, the surface exposure of the colorant is repressed, and thus, the charging capability of the toner particles can be increased.
  • the colorant masterbatch means a resin composition in which a high concentration of colorant is uniformly dispersed, and is manufactured by a method comprising a colorant and a resin are kneaded at a high temperature and high pressure, or by a method comprising: dissolving a resin in a solvent and a colorant is added to the formed solution; and dispersing colorant by applying a high shear force. In the latter case, the solvent must be completely removed before using the toner.
  • a pigment is uniformly dispersed compared to a simple mixing.
  • the masterbatch is pulverized to a very small size when the masterbatch is dispersed in a medium, the resin used for the masterbatch does not completely dissolved in the solvent. That is, even though the particle size of the masterbatch is reduced, the masterbatch can maintain a structure in which a surface of the colorant particle is surrounded by the resin.
  • the content of the pigment in the colorant masterbatch may be about 10 to about 60 weight%, and preferably, 20 to 40 weight%.
  • the toner particles may additionally include an additive, such as a releasing agent, a charge control agent, and/or an external additive.
  • an additive such as a releasing agent, a charge control agent, and/or an external additive.
  • the releasing agent is an additive that can increase the fixing property of a toner image, and may be ester wax, carnauba wax, polyethylene wax, polypropylene wax, bees wax, paraffin wax, or a mixture of these materials. If the content of the releasing agent is less than 0.1 weight%, it is difficult to fix the toner particles without using oil, and if the content of the releasing agent is greater than 10 weight%, the toner may agglomerate when the toner is stored for a long period of time. [35] Therefore, the content of the releasing agent included in the toner particle according to the current embodiment may be 0.1 to 30 weight%, and preferably, 1 to 10 weight% based on the total weight of the toner particle.
  • the charge control agent may be appropriately selected according to the charge of a final toner, and may be a positive charge control agent, a negative charge control agent, or a mixture of the positive and negative charge control agents.
  • the positive charge control agent may be largely classified into an azine-type and a quaternary ammonium salt according to the chemical structure thereof.
  • Azine-type positive charge control agents are mainly black in color, and thus, can be used for manufacturing black-colored toner, and quaternary ammonium salt is in a white powder state, and accordingly, can be used for manufacturing toner of any color.
  • the negative charge control agent may be largely classified into a white color charge control agent of tert-butyl salicylic acid metal salt group and a black color charge control agent of azo group.
  • a central metal may be chrome, aluminium, zinc, calcium, boron, or acetylboron, and, in the case of the azo group, a central metal may be chrome or iron.
  • the metal salt is added to the toner particles, the charging rate and/or amount of charge can be controlled.
  • the content of the charge control agent included in the toner particles according to the current embodiment may be about 0.1 to about 8 weight%, and preferably, 0.3 to 5 weight% based on the total weight of the toner particles. If the content of the charge control agent is less than 0.1 weight %, the charging rate of the toner is reduced and the amount of charge is reduced, and if the content of the charge control agent is greater than 8 weight%, too many charges are distributed on the surface of the toner, and thus, image distortion may occur.
  • the toner particles according to the current embodiment may include the colorant in an amount of about 2 to about 15 weight%, the releasing agent in an amount of about 0.1 to about 30 weight%, the charge control agent in an amount of about 0.1 to about 8 weight%, and the polyester resin as a remaining portion.
  • the toner particles may also include higher fatty acid, fatty acid amide, or their metal salts.
  • the higher fatty acid, fatty acid amide, or their metal salts prevents the degradation of various developing characteristics, and thus, can be appropriately used to obtain high quality images.
  • an external additive such as a fluidizing agent, having very small organic or inorganic particles may be added and coated on the surface of the toner particles according to the current embodiment.
  • the external additive increases the fluidity of the particles to be used as toner or controls charge characteristics such as amount of charge and charging rate.
  • the external additive may be finely classified hydrophobic silica particles; hydrophilic silica particles; silica particles having their surfaces coated with a conductive material such as strontium or calcium; silica particles having their surfaces coated with indium tin oxide or antimony tin oxide, which is a semiconductor; titanium oxide particles having their surfaces coated with a conductive material such as a titanium oxide, strontium, or calcium; titanium oxide particles having their surfaces coated with indium tin oxide or antimony tin oxide, which is a semiconductor; zinc stearate particles; magnesium stearate particles; alumina particles; polymethylmetacrylate particles; polystyrene particles; or silicon particles.
  • the toner particles according to the current embodiment can be manufactured in various non- spherical shapes according to the types of surfactant, polarized solvent, organic solvent, auxiliary solvent, and/or viscosity increasing agent even though the same physical shear force is applied to the toner particles, and also, toner particles having various shapes can be manufactured by changing the temperature for removing the organic solvent.
  • the toner particles according to the current embodiment can be manufactured in various ways. That is, the method is not specifically limited as long as the toner particles having the above properties can be manufactured using a method that is used in the art.
  • the toner particles according to the current embodiment can be manufactured using, for example, the following method. First, a solution containing a polarized medium, an organic solvent, and a surfactant is added to a reactor and then stirred therein at room temperature, thereby forming a solvent emulsion, which is a state in which the organic solvent is dispersed in the polar medium. Next, toner components such as a resin, a colorant, a releasing agent (wax), and a charge control agent are added to the solvent emulsion so that the toner components can be dissolved into the organic solvent. Next, the solvent emulsion that includes the toner components is heated to remove the organic solvent and fine particles of toner are recovered.
  • a solution containing a polarized medium, an organic solvent, and a surfactant is added to a reactor and then stirred therein at room temperature, thereby forming a solvent emulsion, which is a state in which the organic solvent is dispersed in the polar medium.
  • an electrostatic latent image developing agent that includes toner particles and a magnetic carrier (solid carrier particles).
  • the magnetic carrier may be coated with an insulating material. More specifically, the magnetic carrier is a carrier generally used in a two- component developing method, and may be ferrite coated with an insulating material, magnetite coated with an insulating material, iron powder coated with an insulating material, or a mixture of these materials.
  • the magnetic carrier may be the ferrite coated with an insulating material or the magnetite coated with an insulating material.
  • the method according to the present embodiment includes attaching toner particles or an electrostatic latent developing agent on a surface of a photosensitive body on which an electrostatic latent image is formed to form a toner image, and transferring the toner image onto a transferring medium, wherein the toner particles and the electrostatic latent developing agent is the toner particles and electrostatic latent developing agent according to an embodiment of the present invention as described above.
  • an electrophotographic image forming device that employs the toner particles or the electrostatic latent image developing agent.
  • the electrophotographic image forming device may be a laser printer, a copier, or a facsimile.
  • an electrophotographic image forming device that includes a photosensitive body, a means for charging a surface of the photosensitive body, a means for forming an electrostatic latent image on the surface of the photosensitive body, a means for receiving a toner or a developing agent, and a means for forming a toner image by supplying the toner or the developing agent and developing the electrostatic latent image of the surface of the photosensitive body, wherein the toner or the developing agent is the toner or the developing agent according to an embodiment of the present invention.
  • Mode for Invention is the toner or the developing agent according to an embodiment of the present invention.
  • Terminologies, properties of obtained resins, or properties of obtained toner particles are defined or measured using the following methods if not specifically defined.
  • the volume average diameter L is a terminology defined on Page 3 in the Powder
  • the 80% span value is an index that specifies a size distribution of particles.
  • a diameter corresponding to 10% based on volume that is, if the volume of the particles are accumulated by measuring the particle sizes from the smallest to the largest, a diameter corresponding to 10% of the total volume is defined as d 10, a diameter corresponding to 50% of the total volume is defined as d50, and a diameter corresponding to 90% of the total volume is defined as d90.
  • the dlO, d50, and d90 values are obtained from a particle size distribution chart, and the obtained values are substituted in Equation 1.
  • a sample was manufactured such that an appropriate amount of a surfactant was added to 50 to 100 ml of distilled water, and then, 10 to 20 mg of toner particles was added to the distilled water. Afterwards, the mixture was dispersed by an ultrasonic homogenizer for one minute .
  • the area indicates an area where the toner is projected
  • the perimeter means the circumference of a circle that has the same area as the area where the toner is projected.
  • the circularity can have a value of 0 to 1, with a circularity of 1 indicating a perfect sphere.
  • the glass transition temperature was measured using a differential scanning calorimeter (a product of Netzs Co.). After raising the temperature of a sample from 20 to 200 0 C by heating at a heating rate of 10° C /min., the sample was quenched to 10 0 C at a cooling rate of 20°C/min., and then heated at a heating rate of 10° C /min.
  • Acid value measurement [71] The acid value (mgKOH/g) was measured such that, after dissolving a resin in di- chloromethane and cooling it, the solution was titrated using a 0.1 N KOH methyl alcohol solution.
  • the solvent used was tetrahydrofuran (THF), and the molecular weight was measured by making a calibration line of molecular weight using as a polystyrene standard.
  • 0.5 mol of dimethylterephthalate, 0.495 mol of di- methylisophthalate, 0.005 mol of dimethyl 5-sulfoisophthalate sodium salt, 2.3 mol of 1,2-propylene glycol, and 0.02 mol of trimellitic acid were added to the 3L reactor.
  • 500 ppm of tetrabutyltitanate, which is a polymerization catalyst, with respect to the total weight of the monomer was added to the 3L reactor.
  • the temperature of the resultant product was increased to 150 0 C while the stirring speed of the 3L reactor was maintained at 100 rpm. The reaction was maintained for five hours.
  • methanol which was a by-product from the esterification reaction, was not further produced in the condenser, the reaction temperature was increased to 220 0 C and the pressure of the 3L reactor was reduced to 0.1 torr, and the reaction was completed by maintaining the reaction for 15 hours.
  • Polyester resin (2) was manufactured using the same method used to manufacture polyester resin (1) in Preparation Example 1 except for adding 0.98 mol of dimethyl- isophthalate, 0.02 mol of trimellitic acid, and 2.1 mol of butylene glycol as monomers for manufacturing polyester resin (2) instead of the monomers added in Preparation Example 1.
  • toner particles were separated from the emulsion using a conventional filtering device.
  • a filter cake was re-dispersed in distilled water and then, re-filtered the distilled water 4 times to completely remove the surfactant and viscosity increasing agent included in the filter cake.
  • Dried toner particles were obtained by drying the re-filtered toner particles for one day in an oven maintained at a temperature of 40 0 C. Analysis of the obtained toner particles showed that the toner particle s comprises 87.9 weight% of polyester resin, 5.6 weight% of colorant, 4.6 weight% of carnauba wax, and 1.9 weight% of charge control agent.
  • polyester resin (1) manufactured in Preparation Example 1 15 g of cyan pigment masterbatch (1) manufactured in Preparation Example 3, 2 g of charge control agent (N-23: HB Dinglong Co., Hubei, China), 5 g of carnauba wax (SX-70: Max Chemical, Daejeon, Korea), 300 g of methyl ethyl ketone (Aldrich Chemical Company, Milwaukee, Wisconsin, U.S.A.) were sequentially added to a pressurizable 1 L reactor that was equipped with a condenser, a thermometer, and an impeller type stirrer.
  • the temperature of the 3 L reactor was reduced to 45°C, 10 g of MgCl 2 was dissolved in 50 g distilled water and the solution was slowly added to the 3 L reactor, the temperature of the mixture was increased to 80 0 C over 30 minutes, and 5 hours later, the volume average diameter of the particles included in the emulsion was measured. As a result, the volume average diameter was 6.2 ⁇ m.
  • Comparative Example 1 Preparation of Cyan Toner [98] Toner particles were manufactured using the same method as in Example 1 except for using 85 g polyester resin (2) synthesized in Preparation Example 2 instead of 85 g polyester resin (1) synthesized in Preparation Example 1.
  • the polyester resin (2) manufactured in Preparation Example 2 has lower glass transition temperature Tg, PDI, and insoluble content of a resin in THF than those of the polyester resin (1) manufactured in Preparation Example 1.
  • the toner particles manufactured in Examples 1 and 2 according to the present invention have a volume average diameter of 10 ⁇ m or less, an 80% span value of 0.9 or less, and a circularity of 0.99 or less.
  • the toner particles of Comparative Example 1 have properties beyond the above ranges shown in Table 2.
  • the toner particles according to the embodiments of the present invention have a small volume average diameter and a narrow particle size distribution.
  • the toner particles manufactured using the methods described in Examples 1 and 2 according to the present invention show improved fixing property and improved high temperature storage stability compared to the toner particles manufactured using the method described in Comparative Example 1.
  • the upper limit of the fixing temperature range of Examples 1 and 2 is 200 to 210 0 C; however, that of Comparative Example 1 is 170 0 C, that is, the upper limit of the fixing temperature range of Examples 1 and 2 is increased compared to that of Comparative Example 1.
  • the toner particles according to Examples 1 and 2 of the present invention may be fixed at a relatively wider temperature range compared to the toner particles of Comparative Example 1, and thus, the possibility that the fixing roller is contaminated by the toner particles at a high fixing temperature is low.
  • the toner particles according to Examples 1 and 2 show improved high temperature storage stability compared to the toner particles of Comparative Example 1.
  • Present invention provides toner particles which may simultaneously attain particle characteristics suitable for high speed printing and physical properties such as fixing property, high temperature storage stability, etc., and an electrophotographic image forming device comprising the toner particles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

L'invention concerne des particules de toner comprenant une résine liante et un colorant. La résine liante présente: une résine de polyester de poids moléculaire moyen compris entre environ 6.000 et 100.000; une température de transition vitreuse comprise entre environ 55 et 70°C; et un indice de polydispersité (Mw/Mn) compris entre environ 3 et 25, les particules de toner ayant un diamètre volumique moyen compris entre environ 2 et 10 µm et une valeur span à 80% d'au plus 0,9. A la différence d'un toner classique à faible pouvoir de fixation, les particules de toner de l'invention présentent un faible diamètre volumique moyen, une glanulométrie étroite, un pouvoir de fixation amélioré, et une stabilité à l'entreposage à haute température améliorée, même si la résine de polyester est utilisée comme résine liante.
PCT/KR2008/007171 2007-12-05 2008-12-04 Particules de toner et dispositif de formation d'image électrophotographique comprenant celles-ci Ceased WO2009072823A2 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103384853A (zh) * 2010-12-24 2013-11-06 三星精密化学株式会社 调色剂的制备方法
US10338488B2 (en) * 2017-09-26 2019-07-02 Fuji Xerox Co., Ltd. Image forming apparatus

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* Cited by examiner, † Cited by third party
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EP2328035B1 (fr) * 2003-12-10 2016-03-02 Sanyo Chemical Industries, Ltd. Particules de résine
KR101155074B1 (ko) * 2005-07-25 2012-06-11 에스케이케미칼주식회사 토너용 폴리에스테르 수지, 및 이를 사용하여 제조되는 토너
KR100811112B1 (ko) * 2006-04-19 2008-03-06 주식회사 디피아이 솔루션스 안료를 포함하는 폴리에스테르계 화학 토너 조성물 및 그제조방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103384853A (zh) * 2010-12-24 2013-11-06 三星精密化学株式会社 调色剂的制备方法
US10338488B2 (en) * 2017-09-26 2019-07-02 Fuji Xerox Co., Ltd. Image forming apparatus

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WO2009072823A3 (fr) 2009-08-06

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