JP2006058857A - Toner, method for manufacturing toner, two-component developer and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide toner which can realize oilless fixing by which offset is prevented while maintaining high OHP translucency without applying oil, can prolong service life because of no spent of toner components on a carrier, prevents occurrence of voids and scattering in transfer, and obtains high transfer efficiency, and to provide a method for manufacturing such a toner and a two-component developer. <P>SOLUTION: At least a first resin particle dispersion prepared by dispersing a first resin, a colorant particle dispersion prepared by dispersing colorant particles, and a first wax particle dispersion prepared by dispersing a first wax are mixed in an aqueous medium and heat-treated to form core particles, a second wax dispersion is added to the dispersion in which the core particles are dispersed, a second resin particle dispersion prepared by dispersing a second resin is further added, mixed and fused, and an inorganic fine powder is added to the resulting toner base material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a copying machine, a laser printer, plain paper FAX, color PPC, a color laser printer, a color FAX, and a toner used in these multifunction peripherals, a toner manufacturing method, a two-component developer, and an image forming apparatus.

In recent years, the electrophotographic apparatus is shifting from the purpose of office use to personal use, and there is a demand for technology that realizes miniaturization, high speed, high image quality, maintenance-free, and the like.

  When a color image is obtained, toner adheres to the surface of the fixing roller to cause an offset, so that a large amount of oil or the like must be applied to the fixing roller, which complicates handling and the configuration of the device. For this reason, in order to reduce the size, maintain maintenance, and reduce the cost of the equipment, it is required to realize oilless fixing that does not use oil during fixing, which will be described later. In order to make this possible, a configuration in which a release agent such as wax is added to a binder resin having sharp melt characteristics is being put into practical use.

  However, the problem with such a toner configuration is that the toner has a high agglomeration characteristic, so that the tendency of toner image disturbance and transfer failure during transfer occurs more significantly, making it difficult to achieve both transfer and fixing. . When used as two-component development, the low melting point component of the toner adheres to the surface of the carrier due to collision between particles, friction, mechanical collision such as collision between particles and developer, friction, etc., or heat generated by friction. Spent is likely to occur, which lowers the charging ability of the carrier and hinders the long life of the developer.

  Patent Document 1 below proposes a carrier in which a fluorine-substituted alkyl group is introduced into a silicone resin of a coating layer for a positively charged toner. Further, Patent Document 2 below proposes a coating carrier containing a conductive carbon and a cross-linked fluorine-modified silicone resin, as it has a high development capability in a high-speed process and does not deteriorate in the long term. Has been. Taking advantage of the excellent charging characteristics of silicone resin, the fluorine-substituted alkyl group provides slipperiness, peelability, water repellency, etc., preventing wear, peeling, cracks, etc., and preventing spelling. However, wear, delamination, cracks, etc. are not satisfactory, and a positively charged toner can provide an appropriate charge amount, but a negatively charged toner is used. The charge amount was too low, and a large amount of reversely charged toner (toner having positive chargeability) was generated, resulting in deterioration such as fogging and toner scattering, and was not durable.

  Further, in the toner, in the pulverization / classification operation in the conventional kneading and pulverization method, the particle size that can be actually provided economically and in performance even if the particle size is reduced is about 7 μm. At present, methods for producing small-diameter toners by various methods are being studied. Also, a method for realizing oil-less fixing by blending a release agent such as wax in a resin having a low softening point when the toner is melt-kneaded has been studied. However, there is a limit to the amount of wax that can be blended, and as the amount added is increased, adverse effects such as a decrease in toner fluidity, an increase in voids during transfer, and an increase in fusion to the photoreceptor occur.

  Therefore, a toner production method using various polymerization methods different from the kneading and pulverization method has been studied. For example, when a toner is prepared by a suspension polymerization method, even if an attempt is made to control the particle size distribution of the toner, it cannot leave the range of the kneading and pulverization method, and in many cases, further classification operation is required. Further, since the toner obtained by these methods has a substantially spherical shape, there is a problem that the toner remaining on the photosensitive member or the like is very poorly cleaned and the image quality reliability is impaired.

  In addition, a toner preparation method using an emulsion polymerization method includes a step of forming aggregated particles in a dispersion obtained by dispersing at least resin particles to prepare an aggregated particle dispersion, and dispersing resin fine particles in the aggregated particle dispersion The resin fine particle dispersion thus prepared is added and mixed so that the resin fine particles are adhered to the aggregated particles to form the adhered particles, and the adhered particles are heated and fused.

  In the following Patent Document 3, at least a resin particle dispersion obtained by dispersing resin particles in a polar dispersant and a colorant particle dispersion obtained by dispersing colorant particles in a polar dispersant are mixed. A liquid mixture preparation step for preparing a liquid mixture, and by making the polarity of the dispersant contained in the liquid mixture the same polarity, a highly reliable electrostatic image developing toner excellent in chargeability and color development It is disclosed that it can be easily and conveniently manufactured.

  Moreover, in the following Patent Document 4, the release agent contains at least one ester composed of at least one of a higher alcohol having 12 to 30 carbon atoms and a higher fatty acid having 12 to 30 carbon atoms, and the resin particles include: It is disclosed that by including at least two kinds of resin particles having different molecular weights, the fixing property, color developing property, transparency, color mixing property and the like are excellent.

If the dispersibility is deteriorated by adding a release agent, color turbidity tends to occur in a toner image melted at the time of fixing. At the same time, the dispersibility of the pigment also deteriorates, and the color developability of the toner becomes insufficient. In addition, when the resin fine particles are further adhered and fused on the surface of the aggregate in the next step, the dispersion of the release agent or the like makes the adhesion of the resin fine particles unstable. Moreover, the release agent once aggregated with the resin is separated and released into the aqueous system. The dispersion of the release agent has a great influence on the agglomeration during mixing and agglomeration due to the polarity and melting point of the wax used. Furthermore, in order to realize oil-less fixing without using oil at the time of fixing, a specific wax is added in a large amount. And when it fuse | melts with resin from which melting | fusing point, a softening point, and viscoelasticity differ, it becomes difficult to unite | combine, maintaining a uniform state, when uniting by heating. In particular, it is possible to achieve both oil-less fixing, fogging during development, and transfer efficiency by using a release agent having a certain acid value and functional group. In the aqueous system, uniform mixing and aggregation with resin fine particles and pigment fine particles are hindered, and there is a tendency to increase the presence of a floating release agent that is not involved in aggregation in the aqueous system, and also in the pigment.
Japanese Patent No. 2801507 JP 2002-23429 A JP-A-10-198070 JP-A-10-301332

  It is an object of the present invention to produce a toner having a small particle size having a sharp particle size distribution without a classification step.

  An object of the present invention is to achieve both low temperature fixing, high temperature offset property and storage stability by using a release agent such as wax in the toner in oilless fixing without using oil in the fixing roller.

  An object of the present invention is to provide a long-life two-component developer having high durability that does not deteriorate due to spent even when used in combination with a toner containing a release agent such as wax.

  It is an object of the present invention to provide an image forming apparatus that can prevent high-efficiency by preventing omission and scattering during transfer. Another object of the present invention is to provide a toner and a two-component developer that can satisfy the above-mentioned problems comprehensively.

  In view of the above problems, the configuration of the present invention includes, in an aqueous medium, at least a first resin particle dispersion in which first resin particles are dispersed, a colorant particle dispersion in which colorant particles are dispersed, and a first The first wax particle dispersion in which the wax is dispersed is mixed and heated to form aggregated particles in which at least a part is melted, and the second wax is dispersed in the dispersion in which the aggregated particles are dispersed. A second wax particle dispersion is added and heat-treated to fuse the wax to the surface of the aggregated particles, and a second resin particle dispersion in which a second resin is further dispersed is added and heat-treated, A toner obtained by fusing the second resin particles to the surface of the wax fusing layer of aggregated particles, and the endothermic peak temperature of the first wax by the DSC method (referred to as the melting point Tmw1 (° C.)) But the second (Referred to as melting point Tmw2 (℃)) endothermic peak temperature by camphor DSC method from a low temperature, and the temperature difference Tmw1 and Tmw2 is toner 5 ° C. or higher 50 ° C. or less.

  Further, the configuration of the present invention includes, in an aqueous medium, at least a first resin particle dispersion in which first resin particles are dispersed, a colorant particle dispersion in which colorant particles are dispersed, and a first wax. A step of mixing the wax particle dispersion in which the particles are dispersed and heat-treating to form aggregated particles in which at least a part is melted, and a wax particle dispersion in which a second wax is dispersed in the dispersion in which the aggregated particles are dispersed Adding a liquid and heat-treating to form a wax-fused particle for fusing the second wax on the surface of the aggregated particle; and a dispersion in which the second wax-fused particle is dispersed in a second liquid A method for producing a toner comprising a step of adding a second resin particle dispersion in which a resin is dispersed and heat-treating to fuse the second resin particles to the surface of the wax fused particles, D of the first wax Endothermic peak temperature by C method (melting point Tmw1 (° C)) is lower than endothermic peak temperature by DSC method (melting point Tmw2 (° C)) of the second wax, and the temperature difference between Tmw1 and Tmw2 is 5 ° C or more This is a method for producing a toner having a temperature of 50 ° C. or lower.

  In addition, in the configuration of the present invention, the step of forming the second wax-fused particles is such that when the pH value of the aggregated particle dispersion in which the aggregated particles are dispersed is HS, the second wax is dispersed. This is a toner production method including a step of adding the pH of the second wax particle dispersion in a range of HS + 2 to HS-5.

  Further, according to the configuration of the present invention, the step of forming the resin fused particles may be performed when the pH value of the second wax fused particle dispersion in which the second wax fused particles are dispersed is HSw. This is a toner production method including a step of adding the pH value of the second resin particle dispersion in which resin particles are dispersed in a range of HSw + 2 to HSw-5.

  The constitution of the present invention further comprises a toner obtained by externally treating 1.0 to 6 parts by weight of inorganic fine powder having an average particle diameter of 6 nm to 200 nm with respect to 100 parts by weight of the toner base, and at least the surface of the core material. A two-component developer comprising a carrier containing magnetic particles coated with a fluorine-modified silicone resin containing an aminosilane coupling agent.

  The presence of floating wax particles that do not cause aggregation in water and the presence of floating pigments in the pigment are also eliminated, and a small particle size toner that is uniform in size and has a sharp and narrow particle size distribution is classified. It can be created without a process.

  Even without applying oil, oil-free fixing can be realized by preventing low offset and fixing at low temperature.

  A durable two-component developer that does not deteriorate due to spent even when used in combination with a toner containing a release agent such as wax can be realized.

  In addition, in a tandem color process that arranges image forming stations that have multiple photoconductors and development sections side by side, and sequentially transfers the toner of each color to the transfer body, it prevents omission and reverse transfer during transfer. High transfer efficiency can be obtained.

The present invention is an oil-less fixing, has high glossiness and high translucency, has excellent charging characteristics, environmental dependency, cleaning properties, transferability, and a small particle size static having a sharp particle size distribution. The present inventors have earnestly studied to provide a toner for developing a charge image and a two-component developer, and to provide an image formation capable of forming a high-quality and reliable color image free from toner scattering and fogging.
Polymerization method The resin particle dispersion is prepared by emulsion polymerization or seed polymerization of a vinyl monomer in a surfactant to form a vinyl monomer homopolymer or copolymer (vinyl resin). A dispersion obtained by dispersing resin particles in a surfactant is prepared. As the means, for example, a high-speed rotating emulsifier, a high-pressure emulsifier, a colloid emulsifier, a ball mill having a medium, a sand mill, a dyno mill, and the like are known per se.

  As polymerization initiators, 2,2′-azobis- (2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile, 1,1′-azobis (cyclohexane-1-carbonitrile), 2 , 2'-azobis-4-methoxy-2,4-dimethylvaleronitrile, azobisisobutyronitrile and other azo or diazo polymerization initiators, persulfates (potassium persulfate, ammonium persulfate, etc.), azo compounds (4,4′-azobis-4-cyanovaleric acid and its salt, 2,2′-azobis (2-amidinopropane) salt, etc.), peroxide compounds and the like.

  The colorant particle dispersion is prepared by adding colorant particles in water to which a surfactant has been added and dispersing the particles using the above-described dispersion means.

  A preferred first production method of the present invention comprises at least a first resin particle dispersion in which first resin particles are dispersed, a colorant particle dispersion in which colorant particles are dispersed, and an aqueous medium. The first wax particle dispersion in which the first wax is dispersed is mixed and heat-treated to form aggregated particles in which at least a part is melted.

  A wax fused particle in which a second wax particle dispersion in which a second wax is dispersed is added to the dispersion in which the generated aggregated particles are dispersed, and the wax is fused to the surface of the aggregated particles by heat treatment. In addition, a second resin particle dispersion in which the second resin is dispersed is added and heat-treated, and the second resin particles are fused to the surface of the wax fused particles to form the aggregated particle surface. In this configuration, a toner base is formed in which a second wax fusion layer and a second resin fusion layer are formed.

  With this configuration, the first particles of the core particles are obtained by including the first wax having a low melting point in the agglomerated particles (sometimes referred to as core particles), particularly by using an ester wax described later as the wax. The heat treatment at the time of agglomeration with the resin can promote the compatibilization with the resin. The low melting point first wax functions as a fixing aid so that it can be easily melted and can be fixed at a low temperature. It is.

  Further, by fusing a second wax having a high melting point on the surface layer, the second wax can function as a release agent. This is because compatibilization with the core particles hardly proceeds. Furthermore, by adopting a configuration in which the second resin particles are fused to the surface layer, the offset resistance, the peelability and separation between the paper and the fixing roller can be improved, and the spent to the carrier can be improved. Wax filming on the photosensitive member, intermediate transfer member and fixing roller can be prevented.

  In order to exhibit these functional effects, the endothermic peak temperature of the first wax by the DSC method (melting point Tmw1 (° C)) is the endothermic peak temperature of the second wax by the DSC method (melting point Tmw2 (° C)). A configuration in which the temperature is lower and the temperature difference between Tmw1 and Tmw2 is 5 ° C. or more and 50 ° C. or less is preferable.

  The composition that lowers the melting point of the first wax promotes the compatibilization of the core particles with the first resin and is easy to melt, and the mold release action that increases the melting point of the second wax. This is a structure aiming at the effect of improving the offset resistance and improving the offset resistance. If the temperature difference is smaller than 5 ° C., the functions of the respective waxes cannot be effectively separated and exhibited. When the temperature is higher than 50 ° C., the fusion of the second wax to the surface of the core particles does not proceed uniformly, and unevenness tends to remain on the surface.

  According to a preferred second production method of the present invention, in the preferred first production method, the toner base particles are a first resin particle dispersion in which the first resin particles are dispersed in an aqueous medium, and coloring. The colorant particle dispersion in which the agent particles are dispersed is mixed to produce a mixed dispersion. By adjusting the pH of the aqueous medium under a certain condition, and in the presence of a water-soluble inorganic salt, the mixed dispersion is heated to agglomerate at a temperature equal to or higher than the glass transition temperature (Tg (° C.)) of the first resin. In this configuration, aggregated particles in which at least a part is melted are generated. At this time, before adding the water-soluble inorganic salt and before heating, the pH of the mixed dispersion is adjusted to the range of 9.5 to 12.2, the water-soluble inorganic salt is added, and heat treatment is performed to at least the first resin. A configuration in which aggregated particles having a predetermined volume average particle diameter (3 to 6 μm) in which particles and colorant particles are aggregated is preferable.

  Eliminates the presence of suspended wax particles that are not involved in aggregation in water systems, eliminates the presence of suspended colorant particles, and classifies small-sized toners that are small in size and uniform in a narrow range with a sharp particle size distribution. It can be created without a process.

  The pH can be adjusted by adding 1N NaOH. When adjusting the pH of the mixed dispersion before addition of the water-soluble inorganic salt and before heating, if it is less than 9.5, the formed core particles become coarse and the particle size distribution becomes broad. If it is greater than 12.2, the amount of free wax will increase, making it difficult to encapsulate the wax uniformly.

  Further, in the configuration of the second production method, the pH of the liquid when the aggregated particles having a predetermined volume average particle diameter are formed is maintained in the range of 7.0 to 9.5, whereby resin particles and coloring Aggregate particles having a narrow particle size distribution in which the resin particles, the colorant particles, and the first wax are aggregated can be formed. The amount of NaOH to be added, the type and amount of flocculant, the pH of the emulsion polymerization resin dispersion, the set value of the pH of the colorant dispersion, the heating temperature, and the treatment time are appropriately selected. When the pH of the liquid when the aggregated particles are formed is less than 7.0, the aggregated particles tend to be coarse. When the pH exceeds 9.5, the resin particles, the colorant particles, and the first wax particles that are released due to poor aggregation tend to increase.

  A water-soluble inorganic salt is added, and heat treatment is performed to form core particles having a predetermined volume average particle diameter (3 to 6 μm) in which at least the first resin particles, the colorant particles, and the first wax are aggregated. After the pH of the liquid when the core particles having the predetermined volume average particle diameter are formed is in the range of 7.0 to 9.5, then the pH is further in the range of 2.2 to 6.8. It is preferable to adjust and heat-treat to produce core particles.

  By adjusting the pH to this range and performing heat treatment, it is possible to promote the spheroidization of the particle shape while suppressing secondary aggregation between core particles, and to narrow the particle size distribution more sharply. I can do it. The toner base particles produced by such a method are washed and dried, and then subjected to an external addition treatment to produce a toner.

  If the pH is less than 2.2, the effect of the surfactant is lost. When the pH exceeds 6.8, secondary aggregation of the aggregated particles occurs due to heating, and the particle diameter increases and the particle size distribution also becomes broad.

  Further, in the configuration of the second production method, the core particles are prepared by at least a first resin particle dispersion in which the first resin particles are dispersed and a colorant in which the colorant particles are dispersed in an aqueous medium. It is preferable to prepare a mixed dispersion having a pH of 6.0 or less by mixing the particle dispersion and the wax particle dispersion in which the first wax is dispersed.

  When a resin particle dispersion uses a persulfate such as potassium persulfate as a polymerization initiator when polymerizing an emulsion polymerization resin, the residue is decomposed by the heat during the heat aggregation process to change the pH ( Reduction phenomenon), after emulsion polymerization, heating at a certain temperature or higher (preferably 80 ° C. or higher in order to sufficiently disperse the residue) and heating for a certain time (preferably about 1 to 5 hours) It is preferable to perform the treatment. Preferably it is 4 or less, More preferably, it is 1.8 or less.

  The configuration of the preferred third production method of the present invention is the second wax particle dispersion in which the second wax is dispersed in the core particle dispersion in which the core particles produced by the first or second production method are dispersed. Are mixed and heated to form second wax fused particles for fusing the second wax to the surface of the core particles, and further mixed with a second resin particle dispersion in which a second resin is dispersed. And then heat-treating to form resin fused particles for fusing the second resin particles to the surface of the wax adhesion layer of the core particles. It is preferable to adjust the pH of the obtained dispersion to a range of 5.2 to 8.8 and add the second wax particle dispersion.

  In this case, it is not necessary to melt completely, and if it can adhere to the surface of the core particle, the second wax layer can have a sandwich structure with sufficient strength by fusing the second resin.

  The purpose of adjusting the pH in the range of 5.2 to 8.8 is to first adhere the wax particles uniformly to the surface of the core particles while preventing aggregation of the wax particles. When the pH is less than 5.2, adhesion of wax particles hardly occurs, and free wax particles tend to increase. If the pH exceeds 8.8, secondary aggregation between the core particles tends to occur.

  The structure of the preferable 4th manufacturing method of this invention is a fixed time (0.5 to 4 hours) after adjusting pH to the range of 3.2 to 6.8 in the 3rd manufacturing method after that, wax. By performing the heat treatment in the vicinity of the melting point or above, the core particles can be fused to each other without causing secondary aggregation between the core particles or between the free wax particles.

  If the pH after adhesion is less than 3.2, once adhered wax particles may be released. If the pH exceeds 6.8, secondary aggregation of the core particles tends to occur.

  A preferred fifth production method of the present invention is the third or fourth production method, wherein the second resin particles are fused to the surface of the wax fused particles by heating to Tg or higher of the second resin. When forming the resin fusion particles, the pH of the dispersion in which the second wax fusion particles are dispersed is adjusted to the range of 3.2 to 6.8, and the second resin particles are dispersed. The resin particle dispersion is added and heat treated at a temperature equal to or higher than the glass transition temperature of the second resin particles for 1 to 5 hours to fuse the second resin particles to the wax fused particles. .

  The second resin particles are fused to the wax fused particles without causing secondary aggregation between the wax fused particles or the second resin particles, thereby obtaining particles having a narrow particle size distribution.

  If the pH is less than 3.2, the resin particles once adhered may be released. When the pH exceeds 6.8, secondary aggregation of the core particles tends to occur.

  The difference in volume average particle diameter between the core particles and the particles in which the second resin particles are fused to the core particles is preferably 0.5 to 2 μm. If the thickness is less than 0.5 μm, the adhesion state of the second resin is poor, and the influence of moisture and the strength of the second resin itself are insufficient. If it exceeds 2 μm, the fixing property and glossiness are lowered.

  In addition, when the second resin particle dispersion in which the second resin particles are dispersed is added to the dispersion in which the wax fusion particles are dispersed, the pH is first adjusted to the range of 5.2 to 8.8. Then, after the second resin particle dispersion is added, and then subjected to a treatment of heating for about 0.5 to 2 hours at a temperature equal to or higher than the glass transition temperature of the second resin particles, the pH is set to 3.2 to 6. The structure which adjusts to the range of 8 and heat-processes at the temperature more than the glass transition point temperature of the 2nd resin particle for 1 to 5 hours is also preferable.

  The second resin particles can be uniformly attached to the surface of the wax fused particles. If the pH when the second resin particle dispersion is added is less than 5.2, adhesion of the second resin particles hardly occurs, and free resin particles tend to increase. If the pH exceeds 8.8, secondary aggregation between the core particles tends to occur.

  As a preferred sixth configuration of the present invention, the aggregated particle dispersion in which the aggregated particles are dispersed is mixed with the second wax particle dispersion in which the second wax is dispersed and subjected to heat treatment, and the aggregated particle surface is subjected to the above process. The surface of the wax-fused layer of the aggregated particles is formed by forming wax-fused particles for fusing the second wax, and further mixing and heat-treating the second resin particle dispersion in which the second resin is dispersed. In the configuration for forming the resin fused particles for fusing the second resin particles, the aggregated particles are added when the wax particle dispersion in which the second wax is dispersed is added to the produced aggregated particle dispersion. When the pH value of the dispersed aggregated particle dispersion is HS, the pH of the wax particle dispersion in which the second wax is dispersed is adjusted to the range of HS + 2 to HS-5 and added.

  When a wax particle dispersion having a pH value apart from the aggregated particle dispersion is added, the pH balance of the liquid is abruptly disturbed, so that the second wax particles do not adhere to the aggregated particles. As a result, secondary aggregation occurs. In order to suppress such a phenomenon, it is effective to adjust the pH of the wax particle dispersion.

  With this configuration, the generation of wax floating particles is reduced, and the wax particles can be uniformly attached to the surface of the aggregated particles. In addition, adhesion to the agglomerated particles is promoted, the processing time of the fusion is shortened, and productivity can be improved. In addition, when the wax particles are fused to the agglomerated particles, rapid coarsening of the particles can be prevented, and a sharp particle size distribution can be formed with a small particle size. When it is larger than HS + 2, the particles become coarse and the particle size distribution tends to be broad. If it is smaller than HS-5, the wax particles do not adhere to the aggregated particles, and not only does the treatment take a long time, but the wax particles remain floating in the aqueous system and tend not to remain cloudy.

  In a preferred sixth configuration of the present invention, the pH value of the wax particle dispersion in which the wax to be added to the produced aggregated particle dispersion is dispersed is independent of the pH value of the aggregated particle dispersion in which the aggregated particles are dispersed, The structure which adjusts and adds to the range of 3.5-10.5 is preferable.

  When the pH is less than 3.5, the adhesion of the wax particles to the surface of the aggregated particles does not proceed, the wax particles remain floating in the aqueous system, and the liquid remains cloudy. When the pH is higher than 10.5, the generated particles tend to coarsen rapidly.

As a preferred seventh configuration of the present invention, the aggregated particle dispersion in which the aggregated particles are dispersed is mixed with a wax particle dispersion in which the second wax is dispersed and subjected to heat treatment, and then the second aggregate is formed on the surface of the aggregated particles. Wax-fused particles for fusing the wax are formed, and a second resin particle dispersion in which the second resin is dispersed is mixed and heat-treated, and the first particles are formed on the surface of the wax-fused layer of the aggregated particles. In the configuration for forming the resin fusion particles for fusing the two resin particles,
When adding the second resin particle dispersion to the generated wax fusion particle dispersion, assuming that the pH value of the wax fusion particle dispersion in which the wax fusion particles are dispersed is HSw, the second resin particles are In this configuration, the pH of the dispersed second resin particle dispersion is adjusted to the range of HSw + 2 to HSw-5.

  If a strongly acidic second resin particle dispersion or the like is added to the wax fused particle dispersion, the effect of the water-soluble inorganic salt as a flocculant is weakened, and adhesion between the wax fused particles and the resin particles is hindered. In addition, when a resin particle dispersion having a pH value separated from the wax fusion particle dispersion is added, the pH balance of the liquid is suddenly disturbed, so that the resin particles do not adhere to the wax fusion particles. This results in secondary aggregation of the wax fused particles. In order to suppress such a phenomenon, it is effective to adjust the pH of the second resin particle dispersion.

  With this configuration, the generation of floating particles of the second resin particles is reduced, and the second resin particles can be uniformly attached to the surface of the wax-fused particles. Further, adhesion to the wax fused particles is promoted, the fusion processing time is shortened, and productivity can be improved. Further, when the second resin particles are fused to the wax-fused particles, rapid coarsening of the particles can be prevented, and a sharp particle size distribution can be formed with a small particle size. When it is larger than HSw + 2, the particles are coarsened and the particle size distribution tends to be broad. If it is smaller than HSw-5, the adhesion of the second resin particles to the agglomerated particles will not proceed, and not only will the treatment take a long time, but the second resin particles will remain suspended in the aqueous system and remain cloudy. There is a tendency not to progress.

  In a preferred seventh configuration of the present invention, the pH value of the second resin particle dispersion in which the second resin particles to be added to the produced wax fused particle dispersion is dispersed is such that the wax fused particles are dispersed. Regardless of the pH value of the wax-fused particle dispersion, it is preferable to adjust the addition to a range of 3.5 to 10.5.

  When the pH is less than 3.5, the second resin particles do not adhere to the surface of the wax-fused particles, the second resin particles remain floating in the aqueous system, and the liquid remains cloudy. When the pH is higher than 10.5, the generated particles tend to coarsen rapidly.

  The toner base particles are prepared by dispersing the first resin particle dispersion in which the above-described first resin particles are dispersed, the colorant particle dispersion in which the colorant particles are dispersed, and the first wax in an aqueous medium. The first wax particle dispersion thus prepared is added, the pH of the aqueous medium is adjusted under a certain condition, and the aqueous medium is added to the glass transition temperature (Tg) of the first resin in the presence of the water-soluble inorganic salt. Aggregate by heating above or above the melting point of the first wax. Eliminates the presence of suspended wax particles that are not involved in aggregation in water systems, eliminates the presence of suspended colorant particles, and classifies small-sized toners that are small in size and uniform in a narrow range with a sharp particle size distribution. Create without a process.

  At this time, since many water molecules are hydrated to the dispersed particles by the surfactant, the particles are difficult to stick to each other. By adding an electrolyte, water molecules that are hydrated are taken away by the electrolyte, and are easily attached. Furthermore, the particles stick together and grow into larger particles. When a dispersion using an ionic surfactant, for example, an anionic system for resin dispersion and an anionic system for wax dispersion, aggregated particles are obtained, but when hydrated water molecules are taken away by adding an electrolyte, Particles repelled by wax particles remain, and particles aggregated only with the wax floating alone are likely to exist. The presence of particles that do not participate in the aggregation leads to filming on the photosensitive member, a decrease in image density during development, and an increase in fog. Moreover, these suspended particles are gradually added to the aggregated particles during the aggregation heating reaction step for a certain time, leading to a factor that the obtained particles become coarse.

  Therefore, as a preferred first dispersion composition, water molecules that are hydrated by adding an electrolyte by treating the first wax with a surfactant mainly composed of a nonionic surfactant are included. Deprived of electrolytes, it becomes easy to stick. Furthermore, the particles stick together and grow into larger particles. When water molecules that are hydrated are deprived by the addition of electrolyte, they are nonionic, so there is little effect of rebounding wax particles, and the presence of particles that aggregate only floating wax alone is suppressed, and the particle size It is possible to form uniform particles with a sharp distribution. A main component is a structure which a nonionic surfactant has 50% or more with respect to the whole surfactant.

  Further, as a preferred second dispersion, a second wax particle dispersion in which a second wax is dispersed is added to the produced core particle dispersion, and the second wax is dispersed on the surface of the core particles. When forming an adhesion layer, if a wax dispersion treated with an ionic surfactant is added, the viscosity of the aqueous medium increases rapidly, and it tends to be difficult to perform continuous treatment as it is. It is difficult to continue the adhesion and fusion reaction of the next wax unless it is once dispersed by the disperser. In addition, secondary aggregation of the aggregated particles tends to occur and the particles tend to be coarse.

  Therefore, by controlling the main component of the surfactant used in the wax particle dispersion in which the second wax is dispersed in the same manner as the first wax as a nonionic surfactant, the tendency of the viscosity of the aqueous medium to rapidly increase is suppressed. And secondary aggregation of the aggregated particles can be reduced. A main component is a structure which a nonionic surfactant has 50% or more with respect to the whole surfactant.

  Preferably, as the surfactant used in preparing the second wax dispersion, in the case of a mixed system of a nonionic surfactant and an ionic surfactant, the nonionic surfactant is based on the entire surfactant. And preferably 60% or more. If it is less than this, the effect cannot be obtained. Moreover, the structure only of a nonionic surfactant is more preferable.

  Further, as a preferred third dispersion composition, the main component of the surfactant used in the first wax dispersion is only a nonionic surfactant at the time of core particle generation, and the first resin dispersion The surfactant to be used is a mixture of a nonionic surfactant and an ionic surfactant.

  The preferred fourth dispersion is a nonionic surfactant as the main component of the surfactant used in the first resin dispersion when generating the core particles, and the surfactant used in the colorant dispersion. The main component of the agent is a nonionic surfactant.

  It is preferable to have 60% or more of the nonionic surfactant of the colorant dispersion with respect to the entire surfactant. If it is less than this, stable aggregated particles cannot be obtained. Furthermore, the structure only of a nonionic surfactant is more preferable.

  A preferred fifth dispersion is a non-ionic surfactant that is the main component of the surfactant used in the first wax dispersion when generating the core particles, and the interface used in the colorant dispersion. The main component of the active agent is only a nonionic surfactant, the surfactant used in the first resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio is The nonionic surfactant contains 60% or more of the entire surfactant. Preferably, the composition includes 60% or more and 95% or less. This is because the dispersion of the resin particles per se is difficult to stabilize with the configuration of only the nonionic surfactant.

In addition, as a preferable configuration of the sixth dispersion liquid, when the wax fusion particles or the second resin fusion particles are produced, the surfactant used for the second wax dispersion is a nonionic surfactant and an ion. Type surfactants, the mixing ratio of the nonionic surfactant is 60% or more of the total surfactant,
The surfactant used in the second resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio of the surfactant is 60% with respect to the entire surfactant. It is the structure which has the above.

  The object is to create a small particle size toner having a small particle size and uniform, sharp particle size distribution in a narrow range by eliminating the presence of floating wax particles and colorant particles. When the resin surface fusion layer is formed by heating above the Tg of the second resin, the second resin particles are not liberated, and the wax fusion particles are prevented from secondary aggregation and adhere uniformly to the surface. it can.

  The melting point of the first wax is preferably 50 to 90 ° C, and the melting point of the second wax is preferably 80 to 120 ° C. More preferably, the melting point of the first wax is 55 to 85 ° C., the melting point of the second wax is 85 to 100 ° C., more preferably the melting point of the first wax is 65 to 85 ° C., and the melting point of the second wax is It is preferable that it is 90-100 degreeC.

  At this time, if the melting point of the second wax is smaller than 80 ° C., the storage stability is weakened. When the melting point of the second wax exceeds 120 ° C., the cohesiveness of the second resin particles and the second wax decreases, and free particles that do not aggregate in the aqueous system increase. When the melting point of the first wax is lower than 50 ° C., the storage stability is deteriorated. When the melting point of the first wax is higher than 90 ° C., the low temperature fixability is not improved.

  The first wax addition amount is preferably 5 to 30 parts by weight with respect to 100 parts by weight of the binder resin, and the second wax addition amount is preferably 4 to 25 parts by weight. When the amount of the first wax added is less than 5 parts by weight, the effect of low temperature fixability is not exhibited. If the amount exceeds 30 parts by weight, it is difficult to control particles having a small particle size. If the added amount of the second wax is less than 4 parts by weight, the effect of releasability is difficult to be obtained, and if it is more than 25 parts by weight, it is difficult to form a uniform layer of wax.

  Moreover, the compounding ratio can more effectively express the offset resistance and the low-temperature fixability by increasing the amount of the first wax.

  Examples of water-soluble inorganic salts include alkali metal salts and alkaline earth metal salts. Examples of the alkali metal include lithium, potassium, and sodium, and examples of the alkaline earth metal include magnesium, calcium, strontium, and barium. Of these, potassium, sodium, magnesium, calcium, and barium are preferable. Examples of the counter ion (anion constituting the salt) of the alkali metal or alkaline earth metal include chloride ion, bromide ion, iodide ion, carbonate ion and sulfate ion.

  After the particles are produced, the toner can be obtained through any washing step, solid-liquid separation step, and drying step. In this washing step, it is preferable to sufficiently perform substitution washing with ion-exchanged water from the viewpoint of improving the chargeability. There is no restriction | limiting in particular as a separation method in the said solid-liquid separation process, From a viewpoint of productivity, well-known filtration methods, such as a suction filtration method and a pressure filtration method, are mentioned preferably. There is no restriction | limiting in particular as a drying method in the said drying process, Well-known drying methods, such as a flash jet drying method, a fluidized drying method, and a vibration type fluidized drying method, are mentioned preferably from a viewpoint of productivity.

  Examples of nonionic surfactants include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, fatty acid amide ethylene oxide adducts, and fats and ethylene oxides. Adduct, Polyethylene glycol type nonionic surfactant such as polypropylene glycol ethylene oxide adduct, fatty acid ester of glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, alkyl of other alcohol And polyhydric alcohol type nonionic surfactants such as ethers and fatty acid amides of alkanolamines.

  Polyethylene glycol type nonionic surfactants such as higher alcohol ethylene oxide adducts and alkylphenol ethylene oxide adducts can be preferably used.

  Examples of the aqueous medium include water such as distilled water and ion exchange water, and alcohols. These may be used individually by 1 type and may use 2 or more types together. The content of the polar surfactant in the dispersant having the polarity cannot be generally defined and can be appropriately selected according to the purpose.

  In the present invention, it is also preferable to use these nonionic surfactants and ionic surfactants in combination.

  Examples of polar surfactants include anionic surfactants such as sulfate ester, sulfonate, phosphate, and soap, and cationic surfactants such as amine salt type and quaternary ammonium salt type. Can be mentioned.

  Specific examples of the anionic surfactant include sodium dodecylbenzenesulfonate, sodium dodecylsulfate, sodium alkylnaphthalenesulfonate, sodium dialkylsulfosuccinate and the like. Specific examples of the cationic surfactant include laurylamine hydrochloride or stearic acid amine hydrochloride, alkylbenzene dimethyl ammonium chloride, alkyl trimethyl ammonium chloride, distearyl ammonium chloride and the like. These may be used individually by 1 type and may use 2 or more types together.

Specific examples of the cationic surfactant include amine salt types such as alkylbenzenedimethylammonium chloride, alkyltrimethylammonium chloride, and distearyl ammonium chloride, and quaternary ammonium salt types. These may be used individually by 1 type and may use 2 or more types together.
Wax In the toner of this embodiment, the first wax is preferably a wax having an iodine value of 25 or less and a saponification value of 30 to 300. Compatibilization with the resin can be promoted by heat treatment at the time of aggregation with the core particle resin, and the low melting point wax functions as a fixing aid, so that the composition can be easily melted and low temperature fixing can be achieved.

  Further, the repulsion due to the charge effect of the toner during the toner multi-layer transfer is alleviated, and it is possible to suppress the transfer efficiency from being lowered, the character dropout during the transfer, and the reverse transfer. Further, the use in combination with the carrier described later can suppress the occurrence of spent on the carrier, and can extend the life of the developer. Further, the handling property in the developing device is improved, and the uniformity of the image is improved on the rear side and the front side of the development. Further, development memory generation can be reduced.

  If the iodine value is greater than 25, suspended matter in the aqueous system increases, and the uniform inclusion in the core particles decreases. If this remains in the toner, filming of the photoreceptor or the like is caused. The repulsion due to the charge effect of the toner is difficult to be mitigated during the multi-layer transfer of the toner in the primary transfer. The environmental dependency is large, and the change in the charging property of the material becomes large during long-term continuous use, which hinders the stability of the image. Development memory is also likely to occur.

  If the saponification value is less than 30, the presence of unsaponifiable matter and hydrocarbons increases, causing photoreceptor filming and toner chargeability deterioration. It causes a decrease in chargeability during filming and continuous use. If it exceeds 300, suspended matter in the aqueous system increases, and the uniform inclusion in the core particles decreases. The repulsion due to the charge action of the toner is less likely to be alleviated. In addition, fog and toner scattering increase.

  The heat loss of the wax at 220 ° C. is preferably 8% by weight or less. When the loss on heating exceeds 8% by weight, the glass transition point of the toner is lowered, and the storage stability of the toner is impaired. It adversely affects the development characteristics and causes fogging and photoconductor filming. The particle size distribution of the generated toner becomes broad.

Molecular weight characteristics in gel permeation chromatography (GPC), number average molecular weight is 100 to 5000, weight average molecular weight is 200 to 10,000, and ratio of weight average molecular weight to number average molecular weight (weight average molecular weight / number average molecular weight) is 1.01 to 1.01. 8. The ratio of Z-average molecular weight to number-average molecular weight (Z-average molecular weight / number-average molecular weight) is 1.02 to 10, and the molecular weight is 5 × 10 ² to 1 × 10 ⁴ and has at least one molecular weight maximum peak. Preferably it is. More preferably, the number average molecular weight is 500-4500, the weight average molecular weight is 600-9000, the ratio of weight average molecular weight to number average molecular weight (weight average molecular weight / number average molecular weight) is 1.01-7, Z average molecular weight and number average. The molecular weight ratio (Z average molecular weight / number average molecular weight) is 1.02 to 9, more preferably the number average molecular weight is 700 to 4000, the weight average molecular weight is 800 to 8000, and the ratio of the weight average molecular weight to the number average molecular weight (weight average). (Molecular weight / number average molecular weight) is 1.01 to 6, and the ratio of Z average molecular weight to number average molecular weight (Z average molecular weight / number average molecular weight) is 1.02 to 8.

When the number average molecular weight is smaller than 100, the weight average molecular weight is smaller than 200, and the molecular weight maximum peak is located in a range smaller than 5 × 10 ² , the storage stability is deteriorated. Further, the handling property in the developing device is lowered, and the toner density uniformity is inhibited. This causes toner photoconductor filming. The particle size distribution of the generated toner becomes broad.

The number average molecular weight is greater than 5000, the weight average molecular weight is greater than 10,000, the ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight) is greater than 8, and the ratio of the Z average molecular weight to the number average molecular weight (Z When the average molecular weight / number average molecular weight) is larger than 10 and the molecular weight maximum peak is located in a range larger than the region of 1 × 10 ⁴ , the releasing function is weakened, and fixing functions such as fixing property and offset resistance are provided. Decreases. It becomes difficult to reduce the particle size of the generated particles when the emulsified dispersed particles of wax are generated. It becomes difficult to uniformly encapsulate the wax in the resin.

  An endothermic peak temperature (melting point Tmw) by DSC method is preferably 50 to 90 ° C. Preferably it is 55-85 degreeC, More preferably, it is 65-85 degreeC. When the temperature is lower than 50 ° C., the storage stability of the toner is deteriorated. If it is higher than 90 ° C., the low-temperature fixability is not improved. In addition, it is difficult to reduce the particle size when generating the core particles.

  Furthermore, the material whose volume increase rate at the time of 10 degreeC change at the temperature more than melting | fusing point is 2 to 30% is preferable. When it changes from solid to liquid when it melts with heat during fixing, the adhesion between the toners is further strengthened, the fixing property is further improved, and the releasability from the fixing roller is also improved. Offset property is also improved.

  The first wax is preferably a material such as a meadow foam oil derivative, carnauba wax derivative, jojoba oil derivative, wood wax, beeswax, ozokerite, carnauba wax, canderia wax, ceresin wax, rice wax, hydrogenated castor oil, These derivatives are also preferably used. One type or a combination of two or more types can be used. In particular, carnauba wax having a melting point of 76-90 ° C., candelilla wax having 66-80 ° C., hydrogenated jojoba oil having 64-78 ° C., hydrogenated meadowfoam oil having 74-78 ° C. or 74 At least one or two or more kinds of waxes selected from the group consisting of rice waxes having a temperature of ˜90 ° C. are more preferable.

  Meadowfoam oil derivatives include Meadowfoam oil fatty acid, metal salt of Meadowfoam oil fatty acid, Meadowfoam oil fatty acid ester, hydrogenated Meadowfoam oil, Meadowfoam oil amide, Homo Meadowfoam oil amide, Meadowfoam oil triester, Epoxy A maleic acid derivative of a halogenated meadowfoam oil, an isocyanate polymer of a meadowfoam oil fatty acid polyhydric alcohol ester, and a halogenated modified meadowfoam oil can also be preferably used. An emulsified dispersion having a small particle size and a uniform particle size distribution can be prepared. Uniform adhesion to the surface of the aggregated particles can be obtained. In addition, it is easy to uniformly mix and disperse the resin and wax.

  It is a preferable material that is effective for oilless fixing, prolonging the developer life, and improving transferability. These can be used alone or in combination of two or more.

  The meadow foam oil fatty acid obtained by saponification and decomposition of meadow foam oil is preferably composed of a fatty acid having 4 to 30 carbon atoms. As the metal salt, metal salts such as sodium, potassium, calcium, magnesium, barium, zinc, lead, manganese, iron, nickel, cobalt, and aluminum can be used. Good offset resistance at high temperatures.

  Meadow foam oil fatty acid esters include, for example, esters such as methyl, ethyl, butyl, glycerin, pentaerythritol, polypropylene glycol, and trimethylolpropane, and in particular, meadow foam oil fatty acid pentaerythritol monoester and meadowfoam oil fatty acid pentaerythritol triester. Ester, meadow foam oil fatty acid trimethylolpropane ester and the like are preferable. Good cold offset resistance as well as offset resistance at high temperatures.

  Furthermore, an esterification reaction product of a meadow foam fatty acid and a polyhydric alcohol such as glycerin, pentaerythritol, trimethylolpropane, or the like is obtained by using tolylene diisocyanate (TDI), diphenylmethane-4,4′-diisocyanate (MDI), or the like. An isocyanate polymer of a meadow foam oil fatty acid polyhydric alcohol ester obtained by crosslinking with isocyanate can also be preferably used. The spent property to the carrier is small and the life of the two-component developer can be extended.

  Hydrogenated Meadowfoam oil is obtained by hydrogenating Meadowfoam oil to make unsaturated bonds saturated bonds. Glossiness and translucency can be improved along with offset resistance.

  Meadowfoam oil amide is obtained by hydrolyzing meadowfoam oil and esterifying it into fatty acid methyl ester, and then reacting with a mixture of concentrated aqueous ammonia and ammonium chloride. Furthermore, it becomes possible to adjust melting | fusing point by hydrogenating this. It is also possible to hydrogenate before hydrolysis. A product having a melting point of 75 to 120 ° C. is obtained. Homomeadofoam oil amide is obtained through nitrile after hydrolyzing and reducing it to an alcohol. Glossiness and translucency can be improved along with offset resistance.

  Jojoba oil derivatives include jojoba oil fatty acid, metal salt of jojoba oil fatty acid, jojoba oil fatty acid ester, hydrogenated jojoba oil, jojoba oil amide, homo jojoba oil amide, jojoba oil triester, maleic acid derivative of epoxidized jojoba oil, jojoba An isocyanate polymer of an oil fatty acid polyhydric alcohol ester and a halogenated modified jojoba oil can also be preferably used. An emulsified dispersion having a small particle size and a uniform particle size distribution can be prepared. Uniform adhesion to the surface of the aggregated particles can be obtained. In addition, it is easy to uniformly mix and disperse the resin and wax. It is a preferable material that is effective for oilless fixing, prolonging the developer life, and improving transferability. These can be used alone or in combination of two or more.

  Jojoba oil fatty acid obtained by saponifying and decomposing jojoba oil consists of fatty acids having 4 to 30 carbon atoms. As the metal salt, metal salts such as sodium, potassium, calcium, magnesium, barium, zinc, lead, manganese, iron, nickel, cobalt, and aluminum can be used. Good offset resistance at high temperatures.

  Examples of jojoba oil fatty acid esters include methyl, ethyl, butyl, glycerin, pentaerythritol, polypropylene glycol, trimethylolpropane and the like, and in particular, jojoba oil fatty acid pentaerythritol monoester, jojoba oil fatty acid pentaerythritol triester, jojoba Oil fatty acid trimethylolpropane ester and the like are preferable. Good cold offset resistance as well as offset resistance at high temperatures.

  Furthermore, an esterification reaction product of jojoba oil fatty acid and a polyhydric alcohol such as glycerin, pentaerythritol, trimethylolpropane, tolylene diisocyanate (TDI), diphenylmethane-4,4′-disicocyanate (MDI), etc. An isocyanate polymer of jojoba oil fatty acid polyhydric alcohol ester obtained by crosslinking with the above isocyanate can also be preferably used. The spent property to the carrier is small and the life of the two-component developer can be extended.

  Hydrogenated jojoba oil is obtained by hydrogenating jojoba oil to make unsaturated bonds saturated bonds. Glossiness and translucency can be improved along with offset resistance.

  Jojoba oil amide is obtained by hydrolyzing jojoba oil and then esterifying it into fatty acid methyl ester, and then reacting with a mixture of concentrated aqueous ammonia and ammonium chloride. Furthermore, it becomes possible to adjust melting | fusing point by hydrogenating this. It is also possible to hydrogenate before hydrolysis. A product having a melting point of 75 to 120 ° C. is obtained. Homo jojoba oil amide is obtained through hydrolysis of jojoba oil and then reducing it to alcohol, followed by nitrile. Glossiness and translucency can be improved along with offset resistance.

  Saponification value refers to the number of milligrams of potassium hydroxide KOH required to saponify 1 g of a sample. This is the sum of acid value and ester value. To determine the saponification value, a sample is saponified in an alcohol solution of about 0.5 N potassium hydroxide, and then excess potassium hydroxide is titrated with 0.5 N hydrochloric acid.

  The iodine value refers to the amount of halogen absorbed when halogen is allowed to act on a sample, and expressed in terms of g relative to 100 g of the sample. This is the number of grams of iodine absorbed by 100 g of fat, and the higher this value, the higher the degree of unsaturation of the fatty acid in the sample. Add iodine and mercury (II) chloride alcohol solution or iodine chloride glacial acetic acid solution to chloroform or carbon tetrachloride solution of sample and titrate the remaining iodine without reaction with sodium thiosulfate standard solution to absorb iodine Calculate the amount.

  For the measurement of the loss on heating, the weight of the sample cell is precisely weighed to 0.1 mg (W1 mg), 10 to 15 mg of the sample is put in this, and it is precisely weighed to 0.1 mg (W2 mg). The sample cell is set on a differential thermobalance, and the measurement is started with a weighing sensitivity of 5 mg. After the measurement, the weight loss when the sample temperature reaches 220 ° C. is read to 0.1 mg by the chart (W3 mg). The apparatus is TGD-3000 manufactured by Vacuum Riko, the heating rate is 10 ° C./min, the maximum temperature is 220 ° C., the holding time is 1 min, and the heating loss (%) = W 3 / (W 2 −W 1) × 100. .

  Further, as the first wax, materials such as a hydroxy stearic acid derivative, glycerin fatty acid ester, glycol fatty acid ester, sorbitan fatty acid ester and the like are preferable, and use of one kind or a combination of two or more kinds is also effective. Uniform emulsification-dispersed small particle size particles can be produced, and mixed aggregation allows uniform aggregation with the resin pigment, eliminating the presence of suspended solids and suppressing color turbidity.

  Preferred derivatives of hydroxystearic acid include methyl 12-hydroxystearate, butyl 12-hydroxystearate, propylene glycol mono12-hydroxystearate, glycerin mono12-hydroxystearate, ethylene glycol mono12-hydroxystearate, etc. Material. It has the effect of preventing paper wrapping in oilless fixing and the effect of preventing filming.

  Glycerin fatty acid esters include glycerol stearate, glycerol distearate, glycerol tristearate, glycerol monopalmitate, glycerol dipalmitate, glycerol tripalmitate, glycerol behenate, glycerol dibehenate, glycerol tribehenate, glycerol monomyristate Glycerin dimyristate, glycerin trimyristate, and the like are suitable materials. It has the effect of alleviating cold offset at low temperatures and preventing deterioration of transferability in oilless fixing.

  As the glycol fatty acid ester, propylene glycol fatty acid esters such as propylene glycol monopalmitate and propylene glycol monostearate, and ethylene glycol fatty acid esters such as ethylene glycol monostearate and ethylene glycol monopalmitate are suitable materials. Along with oil-less fixability, it has the effect of preventing slippage during development and preventing carrier spent.

  As sorbitan fatty acid esters, sorbitan monopalmitate, sorbitan monostearate, sorbitan tripalmitate, and sorbitan tristearate are suitable materials. Furthermore, materials such as stearic acid ester of pentaerythritol and mixed esters of adipic acid and stearic acid or oleic acid are preferable, and one kind or a combination of two or more kinds can be used. It has the effect of preventing paper wrapping in oilless fixing and the effect of preventing filming.

  In addition, it is also preferable to use an aliphatic amide wax as the first wax. Uniform emulsification-dispersed small particle size particles can be produced, and mixed aggregation allows uniform aggregation with the resin pigment, eliminating the presence of suspended solids and suppressing color turbidity. With the oilless fixing, the life of the developer can be extended, the uniformity in the developing device can be maintained, and the occurrence of development memory can be suppressed.

  The translucency in a color image can be improved. In particular, it is possible to promote the smoothness of the surface of the fixed image and obtain a high-quality color image. Furthermore, it is possible to prevent the copy paper from being wound around the fixing roller at the time of fixing, and it is possible to achieve both the light-transmitting property and the offset resistance and to prevent omission during transfer.

  Examples of the aliphatic amide wax include 4 to 4 carbon atoms such as palmitic acid amide, palmitoleic acid amide, stearic acid amide, oleic acid amide, arachidic acid amide, eicosenoic acid amide, behenic acid amide, erucic acid amide, and ligrinoseric acid amide. A saturated or monovalent unsaturated aliphatic amide having a melting point of 50 to 120 ° C. More preferably, it is 70-100 degreeC, More preferably, it is 75-95 degreeC. When the melting point is lower than 50 ° C., the storage stability of the toner is deteriorated. Filming on the photoreceptor is likely to occur. When the melting point is higher than 120 ° C., it is difficult to reduce the particle size of the generated particles when the emulsified dispersed particles are generated. It becomes difficult to uniformly encapsulate the wax in the resin. The smoothness of the surface of the fixed image is lowered and the translucency is deteriorated.

  Furthermore, methylene bis stearic acid amide, ethylene bis stearic acid amide, propylene bis stearic acid amide, butylene bis stearic acid amide, methylene bis oleic acid amide, ethylene bis oleic acid amide, propylene bis oleic acid amide, butylene bis oleic acid amide, Methylene bis lauric acid amide, ethylene bis lauric acid amide, propylene bis lauric acid amide, butylene bis lauric acid amide, methylene bis myristic acid amide, ethylene bis myristic acid amide, propylene bis myristic acid amide, butylene bis myristic acid amide, methylene bis Palmitic acid amide, ethylene bis palmitic acid amide, propylene bis palmitic acid amide, butylene bis palmitic acid amide, methylene bis palmitic tray Acid amide, ethylene bispalmitoleic acid amide, propylene bispalmitoleic acid amide, butylene bispalmitoleic acid amide, methylene bisarachidic acid amide, ethylene bisarachidic acid amide, propylene bisarachidic acid amide, butylene bisarachidic acid amide, methylene Biseicosenoic acid amide, ethylene biseicosenoic acid amide, propylene biseicosenoic acid amide, butylene biseicosenoic acid amide, methylene bisbehenic acid amide, ethylene bisbehenic acid amide, propylene bisbehenic acid amide , Alkylene of saturated or divalent unsaturated fatty acid such as butylene bisbehenic acid amide, methylene biserucic acid amide, ethylene biserucic acid amide, propylene biserucic acid amide, butylene biserucic acid amide Scan fatty acid amide wax are preferable.

  As the second wax, a fatty acid hydrocarbon wax such as a low molecular weight polypropylene wax, a low molecular weight polyethylene wax, a polypropylene polyethylene copolymer wax, a microcrystalline wax, a paraffin wax, a Fischer-to-push wax can be suitably used.

  By adopting a configuration in which these waxes are arranged close to the surface layer of the particles, it is possible to effectively exert a releasing action and to improve offset resistance and separation properties.

  As the second wax, a wax obtained by a reaction with a long-chain alkyl alcohol, an unsaturated polyvalent carboxylic acid or an anhydride thereof, and a synthetic hydrocarbon wax is preferable as the wax used in the toner of this embodiment. A long-chain alkyl group having 4 to 30 carbon atoms is preferable, and a wax having an acid value of 10 to 80 mgKOH / g can be preferably used.

  Also, a wax obtained by reacting a long-chain alkylamine with an unsaturated polyvalent carboxylic acid or its anhydride and a synthetic hydrocarbon wax, or a long-chain fluoroalkyl alcohol with an unsaturated polyvalent carboxylic acid or its anhydride and synthesis Waxes obtained by reaction with hydrocarbon waxes can also be suitably used. The effects include the enhancement of the releasing action by the long chain alkyl group, the improvement of the dispersion phase with the resin by the ester group, and the improvement of durability and offset property by the vinyl group.

In the molecular weight distribution in GPC of this wax, the weight average molecular weight is 1000 to 6000, the Z average molecular weight is 1500 to 9000, and the ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight) is 1.1 to 3. 8. The ratio of Z-average molecular weight to number-average molecular weight (Z-average molecular weight / number-average molecular weight) is at least one molecular weight maximum peak in the region of 1.5 to 6.5, 1 × 10 ^{3 to} 3 × 10 ⁴ The penetration value at an acid value of 10 to 80 mg KOH / g, a melting point of 80 to 120 ° C. and 25 ° C. is preferably 4 or less.

More preferably, the weight average molecular weight is 1000 to 5000, the Z average molecular weight is 1700 to 8000, the ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight) is 1.1 to 2.8, and the Z average molecular weight is The number average molecular weight ratio (Z average molecular weight / number average molecular weight) is at least one molecular weight maximum peak in the region of 1.5 to 4.5, 1 × 10 ³ to 1 × 10 ⁴ , and the acid value is 10 to 50 mgKOH. / G, melting point 85-120 ° C. is preferable,
More preferably, the weight average molecular weight is 1000 to 2500, the Z average molecular weight is 1900 to 3000, the ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight) is 1.2 to 1.8, and the Z average molecular weight is The ratio of the number average molecular weight (Z average molecular weight / number average molecular weight) is at least one molecular weight maximum peak in the region of 1.7 to 2.5, 1 × 10 ^{3 to} 3 × 10 ³ , and the acid value is 35 to 50 mgKOH. / G, melting point 95-110 ° C.

  Non-offset property and high glossiness in oilless fixing, and high translucency of OHP can be expressed, and high temperature storage stability is not deteriorated. In an image in which three layers of color toner are formed on thin paper, this is particularly effective for improving the paper separation from the fixing roller and belt.

  Further, it is possible to produce particles having a small particle size that are uniformly emulsified and dispersed in a polar dispersant, and it is possible to uniformly agglomerate with the resin pigment by mixing and agglomeration, thereby eliminating the presence of suspended matters and suppressing color turbidity. Further, uniform adhesion to the surface of the aggregated particles can be obtained.

  Further, even if a fluorine-based or silicone-based member is used for the fixing roller, the offset of the halftone image can be prevented.

  By using it in combination with the carrier described later, the generation of spent can be suppressed together with oilless fixing, the life of the developer can be extended, the uniformity in the developing device can be maintained, and the occurrence of development memory can also be suppressed. Furthermore, charging stability during continuous use can be obtained, and both fixing property and development stability can be achieved.

  Here, if the carbon number of the long-chain alkyl of the wax is smaller than 4, the releasing action is weakened, and the separation property and the high temperature non-offset property are deteriorated. When the carbon number of the long-chain alkyl is larger than 30, the mixed aggregation property with the resin is deteriorated and the dispersibility is lowered. When the acid value is smaller than 10 mgKOH / g, the charge amount during long-term use of the toner is reduced. When the acid value is greater than 80 mgKOH / g, the moisture resistance decreases, and the fogging under high humidity increases. If it is high, it is difficult to reduce the particle size of the produced particles when the emulsified dispersed particles are produced. Uniform adhesion to the surface of the aggregated particles is reduced. It becomes difficult to uniformly encapsulate the wax in the resin.

  When the melting point is less than 50 ° C., the storage stability of the toner is lowered. When the melting point is higher than 120 ° C., the releasing action is weakened and the non-offset temperature range is narrowed. If it is high, it is difficult to reduce the particle size of the produced particles when the emulsified dispersed particles are produced. It becomes difficult to uniformly encapsulate the wax in the resin.

  When the penetration at 25 ° C. is larger than 4, the toughness is lowered and the photoreceptor filming occurs during long-term use.

Weight average molecular weight smaller than 1000, Z average molecular weight smaller than 1500, Weight average molecular weight / number average molecular weight smaller than 1.1, Z average molecular weight / number average molecular weight smaller than 1.5, molecular weight maximum peak Is located in a range smaller than 1 × 10 ³ , the storage stability of the toner is lowered, and filming occurs on the photosensitive member and the intermediate transfer member. Further, the handling property in the developing device is lowered, and the uniformity of the toner density is lowered. Also, development memory is likely to occur. The particle size distribution of the produced particles at the time of producing the emulsified dispersed particles at the time of the action of a high shearing force by high-speed rotation becomes a load.

The weight average molecular weight is greater than 6000, the Z average molecular weight is greater than 9000, the weight average molecular weight / number average molecular weight is greater than 3.8, the Z average molecular weight / number average molecular weight is greater than 6.5, and the molecular weight maximum If the peak is located in a range larger than the region of 3 × 10 ⁴ , the releasing action is weakened and the fixing offset property is lowered. It becomes difficult to reduce the particle size of the generated particles when the emulsified dispersed particles are generated. It becomes difficult to uniformly encapsulate the wax in the resin.

  As the alcohol, those having a long alkyl chain such as octanol, dodecanol, stearyl alcohol, nonacosanol, pentadecanol and the like can be used. Moreover, N-methylhexylamine, nonylamine, stearylamine, nonadecylamine, etc. can be used conveniently as amines. As the fluoroalkyl alcohol, 1-methoxy- (perfluoro-2-methyl-1-propene), hexafluoroacetone, 3-perfluorooctyl-1,2-epoxypropane and the like can be suitably used. As the unsaturated polyvalent carboxylic acid or anhydride thereof, one or more of maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride and the like can be used. Of these, maleic acid and maleic anhydride are more preferable.

  As the synthetic hydrocarbon wax, polyethylene, polypropylene, Fischer Toro push wax, α-olefin and the like can be suitably used.

  Unsaturated polyhydric carboxylic acid or its anhydride is polymerized with alcohol or amine, and this is then added to synthetic hydrocarbon wax in the presence of dicrummi peroxide or tertiary butyl peroxyisopropyl monocarbonate. Can be obtained.

  By using the above-mentioned wax, it is possible to uniformly adhere to the surface of the core particle without causing detachment and floating, to eliminate the influence of free wax, to prevent filming and carrier spent on OPC and transfer belt, and at the time of transfer It is possible to effectively prevent voids and reverse transcription. Since the release agent is arranged near the toner surface layer, the release action can be more effectively repelled.

  At this time, the dispersed particle diameter of the wax is 20 to 200 nm for the 16% diameter (PR16), 40 to 300 nm for the 50% diameter (PR50), and 84% for the 84% diameter (PR84). ) Is 400 nm or less and PR84 / PR16 is emulsified and dispersed to a size of 1.2 to 2.0. It is preferable that particles of 200 nm or less are 65 volume% or more and particles exceeding 500 nm are 10 volume% or less.

  Preferably, the 16% diameter (PR16) is 20 to 100 nm, the 50% diameter (PR50) is 40 to 160 nm, and the 84% diameter (PR84) is 260 nm or less when integrated from the small particle diameter side. PR84 / PR16 is 1.2 to 1.8. It is preferable that particles of 150 nm or less are 65 volume% or more and particles exceeding 400 nm are 10 volume% or less.

  More preferably, the 16% diameter (PR16) is 20 to 60 nm, the 50% diameter (PR50) is 40 to 120 nm, and the 84% diameter (PR84) is 220 nm or less when integrated from the small particle diameter side. , PR84 / PR16 is 1.2 to 1.8. It is preferable that particles of 130 nm or less are 65 volume% or more, and particles exceeding 300 nm are 10 volume% or less.

  When the core particle dispersion and the wax particle dispersion are mixed and aggregated to form wax fused particles, the 50% diameter (PR50) is 20-200 nm and the fine dispersion makes the wax easily adhere to the particle surface. Aggregation between the waxes itself can be prevented, dispersion can be performed uniformly, and particles floating in water can be eliminated.

  PR16 is larger than 160 nm, 50% diameter (PR50) is larger than 200 nm, PR84 is larger than 300 nm, PR84 / PR16 is larger than 2.0, particles of 200 nm or less are larger than 65% by volume and larger than 500 nm When the amount exceeds 10% by volume, the wax hardly adheres to the particles, and the agglomeration occurs only between the waxes, and the wax particles floating in water tend to increase. In addition, when the resin is adhered and fused, the amount of wax that is exposed and released on the surface of the toner base increases, filming on the photoconductor, increased spent on the carrier, handling characteristics during development, and development memory are generated. It becomes easy.

  When PR16 is smaller than 20 nm, 50% diameter (PR50) is smaller than 40 nm, and PR84 / PR16 is smaller than 1.2, it is difficult to maintain a dispersed state, and reaggregation of wax occurs when left, and particle size distribution. The standing stability of is not good. In addition, the load increases during dispersion, heat generation increases, and productivity decreases.

  Further, the 50% diameter (PR50) in the volume particle size accumulated when the wax particles dispersed in the wax particle dispersion are accumulated from the small particle size side is the resin particle when forming the core particles blended with the wax. By making it smaller than the 50% diameter (PR50), the wax and the resin particles can be easily taken in, and aggregation between the waxes can be prevented and the dispersion can be performed uniformly. Particles that are taken into the resin particles and float in the water can be eliminated. More preferably, it is 20% or more smaller than the 50% diameter (PR50) of the resin particles.

  A rotating body in which a wax melt obtained by melting the wax at a wax concentration of 40 wt% or less is rotated at a high speed through a fixed gap with a fixed gap in a medium to which a dispersant maintained at a temperature higher than the melting point of the wax is added. The wax particles can be finely dispersed by emulsifying and dispersing by the action of high shear force generated by the above.

  3 and 4, a gap of about 0.1 mm to 10 mm is provided in the tank wall in the tank of a certain capacity, and the rotating body is 30 m / s or more, preferably 40 m / s or more, more preferably 50 m / s or more. By rotating at a high speed, a strong shearing force acts on the aqueous system, and an emulsified dispersion having a fine particle size can be obtained. The dispersion can be formed by a treatment time of about 30 seconds to 5 minutes.

  A rotating body that rotates at a speed of 30 m / s or more, preferably 40 m / s or more, more preferably 50 m / s or more, with a gap of about 1 to 100 μm provided to a fixed stationary body as shown in FIGS. By adding a strong shearing force action, a fine dispersion can be created.

  Compared with a high-pressure disperser such as a high-pressure homogenizer, the particle size distribution of fine particles can be made narrower and sharper. Further, even when left for a long time, the fine particles forming the dispersion do not reaggregate and can maintain a stable dispersion state, and the standing stability of the particle size distribution is improved.

  When the melting point of the wax is high, a molten liquid is prepared by heating in a high pressure state. Also, the wax is dissolved in an oily solvent. This solution is obtained by dispersing fine particles in water together with a surfactant and a polymer electrolyte using the disperser shown in FIGS. 3, 4, 5 and 6, and then evaporating the oily solvent by heating or decompressing. You can also

The particle size can be measured using a Horiba laser diffraction particle size measuring device (LA920), a Shimadzu laser diffraction particle size measuring device (SALD2100), or the like.
Resin Examples of the resin fine particles of the toner of the present embodiment include a thermoplastic binder resin. Specifically, styrenes such as styrene, parachlorostyrene and α-methylstyrene, acrylic monomers such as methyl acrylate, ethyl acrylate, n-propyl acrylate, lauryl acrylate and 2-ethylhexyl acrylate , Methacrylic monomers such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, lauryl methacrylate, 2-ethylhexyl methacrylate, and other carboxyl groups such as acrylic acid, methacrylic acid, maleic acid and fumaric acid Homopolymers such as unsaturated polyvalent carboxylic acid-based monomers possessed as, copolymers obtained by combining two or more of these monomers, or mixtures thereof.

  The content of the resin particles in the resin particle dispersion is usually 5 to 50% by weight, preferably 10 to 40% by weight. The molecular weights of the resin, wax, and toner are values measured by gel permeation chromatography (GPC) using several types of monodisperse polystyrene as standard samples.

  The apparatus is HPLC 8120 series manufactured by Tosoh Corporation, the column is TSKgel superHM-H H4000 / H3000 / H2000 (7.8 mm diameter, 150 mm × 3), eluent THF (tetrahydrofuran), flow rate 0.6 ml / min, sample concentration 0.1 %, Injection amount 20 μL, detector RI, measurement temperature 40 ° C., pretreatment for measurement is to measure a resin component obtained by dissolving a sample in THF and filtering through a 0.45 μm filter to remove additives such as silica. The measurement conditions are conditions in which the molecular weight distribution of the target sample is included in a range in which the logarithm of the molecular weight and the count number are linear in a calibration curve obtained with several types of monodisperse polystyrene standard samples.

  The wax obtained by the reaction with a long-chain alkyl alcohol, an unsaturated polyvalent carboxylic acid or an anhydride thereof, and a synthetic hydrocarbon wax was measured by using a GPC-150C manufactured by WATERS, a column of ShodexHT-806M (8.0 mmI). D.-30 cm × 2), eluent is o-dichlorobenzene, flow rate is 1.0 mL / min, sample concentration is 0.3%, injection volume is 200 μL, detector is RI, measurement temperature is 130 ° C., measurement In the pretreatment, the sample was dissolved in a solvent and then filtered through a 0.5 μm sintered metal filter. The measurement conditions are conditions in which the molecular weight distribution of the target sample is included in a range in which the logarithm of the molecular weight and the count number are linear in a calibration curve obtained with several types of monodisperse polystyrene standard samples.

The softening point of the binder resin was about 9.8 with a plunger while heating a 1 cm ³ sample at a heating rate of 6 ° C./min with a constant-load extrusion capillary rheometer flow tester (CFT500) manufactured by Shimadzu Corporation. Applying a load of × 10 ⁵ N / m ² and extruding from a die with a diameter of 1 mm and a length of 1 mm, the piston stroke begins to rise from the relationship between the temperature rise characteristic of the plunger stroke and temperature. The temperature is the outflow start temperature (Tfb), 1/2 of the difference between the lowest value of the curve and the end point of the outflow, and the temperature at the point where the minimum value of the curve is added is the melting temperature (softening point) in the 1/2 method. Tm).

  In addition, the glass transition point of the resin was measured by using a differential scanning calorimeter (Shimadzu DSC-50), heated to 100 ° C., allowed to stand at that temperature for 3 minutes, and then cooled to room temperature at a cooling rate of 10 ° C./min. When the thermal history is measured by heating at a heating rate of 10 ° C./min, the maximum slope between the baseline extension line below the glass transition point and the peak rising portion to the peak apex is shown. Says the temperature at the intersection with the tangent.

The melting point of the endothermic peak of DSC by DSC was raised to 200 ° C. at 5 ° C./min using a differential scanning calorimeter (Shimadzu Corporation DSC-50), rapidly cooled to 10 ° C. for 5 minutes, and then left for 15 minutes. The temperature was raised at ° C./min, and the endothermic (melting) peak was obtained. The amount of sample put into the cell was 10 mg ± 2 mg.
Charge Control Agent The charge control agent is preferably an acrylic sulfonic acid polymer, and a vinyl copolymer of a styrene monomer and an acrylic acid monomer having a sulfonic acid group as a polar group. In particular, a copolymer with acrylamido-2-methylpropanesulfonic acid can exhibit preferable characteristics. By using it in combination with a carrier to be described later, the handling property in the developing device is improved and the uniformity of the toner density is improved. Further, development memory can be suppressed.

  These are melted in a resin monomer at the time of emulsion polymerization (for example, a styrene monomer is suitable), and the monomer is subjected to emulsion polymerization, whereby a resin fine particle dispersion to which CCA is added can be prepared.

The addition amount is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the resin. More preferably, it is 0.1-2 weight part, More preferably, it is 0.5-1.5 weight part. When the amount is less than 0.1 parts by weight, the charging effect is lost. If it exceeds 5 parts, the dispersion will not be uniform. Color turbidity in color images is noticeable.
Pigment The colorant used in this embodiment includes carbon black, iron black, graphite, nigrosine, metal complexes of azo dyes, C.I. I. Acetoacetic acid arylamide monoazo yellow pigments such as CI Pigment Yellow 1,3,74,97,98; I. Acetoacetic acid arylamide disazo yellow pigments such as C.I. Pigment Yellow 12, 13, 14, and 17; I. Solvent Yellow 19, 77, 79, C.I. I. Disperse Yellow 164 is blended, and C.I. I. Benzimidazolone pigments of CI Pigment Yellow 93, 180 and 185 are preferred.

  C. I. Red pigments such as CI Pigment Red 48, 49: 1, 53: 1, 57, 57: 1, 81, 122, 5; I. Red dyes such as Solvent Red 49, 52, 58, 8; I. One or two or more kinds of blue dyes and pigments of phthalocyanine and derivatives thereof such as CI Pigment Blue 15: 3 are blended. The addition amount is preferably 3 to 10 parts by weight with respect to 100 parts by weight of the binder resin.

The median diameter of each particle is usually 1 μm or less, preferably 0.01 to 0.3 μm. When the median diameter is more than 0.3 μm, the particle diameter distribution of the finally obtained toner for developing an electrostatic charge image is broadened, or free particles are generated, which tends to deteriorate performance and reliability. On the other hand, when the median diameter is within the above range, there are no disadvantages, and the uneven distribution among the toners is reduced, the dispersion in the toner is improved, and the variation in performance and reliability is advantageous. The median diameter can be measured using, for example, a Horiba laser diffraction particle size measuring instrument (LA920).
External additive In this embodiment, as the external additive, fine metal oxide powders such as silica, alumina, titanium oxide, zirconia, magnesia, ferrite, and magnetite, titanates such as barium titanate, calcium titanate, strontium titanate, etc. Inorganic fine powders such as zirconate salts such as barium zirconate, calcium zirconate, strontium zirconate or mixtures thereof are used. The inorganic fine powder is hydrophobized as necessary.

  As the silicone oil-based material to be processed into the inorganic fine powder, those shown in (Chemical Formula 1) are preferable.

  For example, dimethyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, cyclic dimethyl silicone oil, epoxy modified silicone oil, carboxyl modified silicone oil, carbinol modified silicone oil, methacryl modified silicone oil, mercapto modified silicone oil, polyether modified Silica treated with at least one of silicone oil, methylstyryl-modified silicone oil, alkyl-modified silicone oil, fluorine-modified silicone oil, amino-modified silicone oil, and chlorophenyl-modified silicone oil is preferably used. For example, SH200, SH510, SF230, SH203, BY16-823, BY16-855B, etc. manufactured by Toray Dow Corning Silicone may be mentioned. Treatment is a method of mixing inorganic fine powder and material such as silicone oil with a mixer such as a Henschel mixer, a method of spraying silicone oil-based material onto inorganic fine powder, or dissolving or dispersing silicone oil-based material in a solvent. Then, after mixing with inorganic fine powder, there is a method of removing the solvent and making it. It is preferable that 1 to 20 parts by weight of the silicone oil-based material is blended with respect to 100 parts by weight of the inorganic fine powder.

  As silane coupling agents, dimethyldichlorosilane, trimethylchlorosilane, allyldimethylchlorosilane, hexamethyldisilazane, allylphenyldichlorosilane, benzylmethylchlorosilane, vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, There are vinyltriacetoxysilane, divinylchlorosilane, dimethylvinylchlorosilane, and the like. The silane coupling agent treatment is a dry treatment in which the vaporized silane coupling agent is reacted with a fine powder made into a cloud by stirring or the like, or a wet treatment in which a silane coupling agent in which the fine powder is dispersed in a solvent is dropped. Processed by law.

  It is also preferable to treat the silicone oil-based material after the silane coupling treatment.

  The inorganic fine powder having positive electrode chargeability is treated with aminosilane, amino-modified silicone oil or epoxy-modified silicone oil shown in (Chemical Formula 2).

  Moreover, in order to improve hydrophobic treatment, the combined use of treatment with hexamethyldisilazane, dimethyldichlorosilane, or other silicone oil is also preferable. For example, it is preferable to treat with at least one of dimethyl silicone oil, methylphenyl silicone oil, and alkyl-modified silicone oil.

  It is also preferable to treat the surface of the inorganic fine powder with a fatty acid ester, a fatty acid amide, or a fatty acid metal salt. Silica or titanium oxide fine powder obtained by surface-treating any one kind or two or more kinds is more preferred.

  Examples of fatty acids and fatty acid metal salts include caprylic acid, capric acid, undecyl acid, lauric acid, myristylic acid, parimitic acid, stearic acid, behenic acid, montanic acid, laccellic acid, oleic acid, erucic acid, sorbic acid, linoleic acid, etc. Is mentioned. Of these, fatty acids having 14 to 20 carbon atoms are preferred.

Examples of the metal constituting the fatty acid metal salt include aluminum, zinc, calcium, magnesium, lithium, sodium, lead, and barium. Of these, aluminum, zinc, and sodium are preferable. Particularly preferred are aluminum distearate such as aluminum distearate (Al (OH) (C ₁₇ H ₃₅ COO) ₂ ) or aluminum monostearate (Al (OH) ₂ (C ₁₇ H ₃₅ COO)), and mono fatty acid aluminum. Is preferred. Having an OH group can prevent overcharging and suppress poor transfer. Moreover, it is thought that the processability with inorganic fine powders, such as a silica, improves at the time of a process.

  In addition, the handling property of the toner having a small particle diameter can be improved, and both high image quality and improved transferability can be achieved in development and transfer. In development, the latent image can be reproduced more faithfully. Transfer can be performed without deteriorating the transfer rate of the toner particles during transfer. Further, in tandem transfer, retransfer can be prevented, and occurrence of voids can be suppressed. Furthermore, a high image density can be obtained even if the development amount is reduced. In addition, use in combination with a carrier, which will be described later, can further improve spent resistance, improve handling in the developing device, and increase toner density uniformity. Moreover, development memory generation can be suppressed.

  A configuration in which 1 to 6 parts by weight of an inorganic fine powder having an average particle diameter of 6 nm to 200 nm is externally added to 100 parts by weight of toner base particles is preferable. If the average particle diameter is smaller than 6 nm, silica floating or filming on the photoreceptor is likely to occur. The occurrence of reverse transcription during transcription cannot be suppressed. When it is larger than 200 nm, the fluidity of the toner is deteriorated. When the amount is less than 1.5 parts by weight, the fluidity of the toner is deteriorated. The occurrence of reverse transcription during transcription cannot be suppressed. If the amount is more than 6 parts by weight, silica floating and filming on the photoreceptor are likely to occur. High temperature offset is deteriorated.

  Further, the inorganic fine powder having an average particle diameter of 6 nm to 20 nm is 0.5 to 2.5 parts by weight with respect to 100 parts by weight of the toner base particles, and the inorganic fine powder having an average particle diameter of 20 nm to 200 nm is 100 parts by weight of the toner base particles. On the other hand, a configuration in which 0.5 to 3.5 parts by weight is at least externally added is preferable. By using the silica whose function is separated by this configuration in a toner base prepared by a wet method, it is possible to obtain a margin for handling in development, reverse transfer during transfer, voids, and scattering. In addition, the spent on the carrier can be prevented. At this time, the ignition loss of the inorganic fine powder having an average particle diameter of 6 nm to 20 nm is preferably 1.5 to 25 wt%, and the ignition loss of the average particle diameter of 20 nm to 200 nm is preferably 0.5 to 23 wt%.

  By specifying the loss on ignition of the inorganic fine powder, a margin can be taken against reverse transfer, dropout and scattering during transfer. Further, the spent resistance of the wax to the carrier can be improved, the handling property in the developing device can be improved, and the uniformity of the toner density can be increased. Moreover, development memory generation can be suppressed.

  If the loss on ignition with an average particle size of 6 nm to 20 nm is less than 1.5 wt%, the transfer margin for reverse transfer and voids becomes narrow. If it exceeds 25 wt%, the surface treatment becomes uneven, resulting in uneven charging. The ignition loss is preferably 1.5 to 20 wt%, more preferably 5 to 19 wt%.

  If the loss on ignition with an average particle diameter of 20 nm to 200 nm is less than 0.5 wt%, the transfer margin for reverse transfer and hollow out becomes narrow. If it exceeds 23 wt%, the surface treatment becomes uneven, resulting in uneven charging. The ignition loss is preferably 1.5 to 18 wt%, more preferably 5 to 16 wt%.

  Further, a positively chargeable inorganic fine powder having an average particle diameter of 6 nm to 200 nm and an ignition loss of 0.5 to 25 wt% is further externally added in an amount of 0.2 to 1.5 parts by weight based on 100 parts by weight of the toner base particles. A configuration for processing is also preferable.

  The effect of adding the positively chargeable inorganic fine powder suppresses the toner from being overcharged during long-term continuous use, and can further extend the developer life. Furthermore, the effect of suppressing scattering during transfer due to overcharging can also be obtained. In addition, the spent on the carrier can be prevented. If the amount is less than 0.2 parts by weight, it is difficult to obtain the effect. If it exceeds 1.5 parts by weight, fogging during development increases. The ignition loss is preferably 1.5 to 20 wt%, more preferably 5 to 19 wt%.

  For drying loss (%), about 1 g of a sample is placed in a container that has been dried, allowed to cool, and precisely weighed in advance, and weighed accurately. Dry in a hot air dryer (105 ° C ± 1 ° C) for 2 hours. After cooling in a desiccator for 30 minutes, the weight is precisely weighed and calculated from the following formula.

Loss on drying (%) = Loss on drying (g) / Sample amount (g) × 100
For ignition loss, about 1 g of a sample is placed in a magnetic crucible that has been dried, allowed to cool, and precisely weighed in advance, and weighed accurately. Ignite for 2 hours in an electric furnace set to 500 ° C. After standing to cool in a desiccator for 1 hour, its weight is precisely weighed and calculated from the following formula.

Loss on ignition (%) = Loss on ignition (g) / Sample amount (g) × 100
Moreover, it is preferable that the moisture adsorption amount of the processed inorganic fine powder is 1 wt% or less. Preferably it is 0.5 wt% or less, More preferably, it is 0.1 wt% or less, More preferably, it is 0.05 wt% or less. When the content is more than 1 wt%, chargeability is deteriorated and filming on the photoconductor during durability is caused. The water adsorption amount was measured with a continuous vapor adsorption device (BELSORP18: Nippon Bell Co., Ltd.) for the water adsorption device.

  For the determination of the degree of hydrophobicity, 0.2 g of the product to be tested is weighed into 50 ml of distilled water charged in a 250 ml beaker. At the tip, methanol is dropped from a burette invaded in the liquid until the total amount of the inorganic fine powder is wet. At that time, slowly stir slowly with an electromagnetic stirrer. The degree of hydrophobicity is calculated by the following equation from the amount of methanol a (ml) essential for complete wetting.

Hydrophobic degree = (a / (50 + a)) × 100 (%)
In this embodiment, toner base particles containing a binder resin, a colorant and a wax have a volume average particle size of 3 to 7 μm and a toner base particle having a particle size of 2.52 to 4 μm in the number distribution. A toner base particle having a particle size of 10 to 75% by number, a toner base particle having a particle size of 4 to 6.06 μm in the volume distribution is 25 to 75% by volume, and a toner base particle having a particle size of 8 μm or more in the volume distribution is The volume% of toner base particles having a particle size of 4 to 6.06 μm in the volume distribution is V46, and the toner base particles having a particle size of 4 to 6.06 μm in the number distribution are contained in 5% by volume or less. When the number% is P46, P46 / V46 is in the range of 0.5 to 1.5, the coefficient of variation in volume average particle size is 10 to 30%, and the coefficient of variation in number particle size distribution is 10 to 35%. Prefer to be That's right.

  Preferably, the toner base particles have a volume average particle size of 3 to 6.5 μm, the content of toner base particles having a particle size of 2.52 to 4 μm in the number distribution is 20 to 75% by number, and 4 to 6 in the volume distribution. Toner base particles having a particle size of 0.06 μm are 35 to 75% by volume, toner base particles having a particle size of 8 μm or more in the volume distribution are contained in 3% by volume or less, and 4 to 6. When the volume% of toner base particles having a particle size of 06 μm is V46 and the number% of toner base particles having a particle size of 4 to 6.06 μm in the number distribution is P46, P46 / V46 is 0.5. It is preferable that the coefficient of variation in the volume average particle diameter is 15 to 25% and the coefficient of variation in the number particle size distribution is 15 to 28%.

  More preferably, the toner base particles have a volume average particle size of 3 to 5 μm, the content of toner base particles having a particle size of 2.52 to 4 μm in the number distribution is 40 to 75% by number, and 4 to 6 in the volume distribution. The toner base particles having a particle size of 0.06 μm are 45 to 75% by volume, the toner base particles having a particle size of 8 μm or more in the volume distribution are contained in 3% by volume or less, and 4 to 6. When the volume% of toner base particles having a particle size of 06 μm is V46 and the number% of toner base particles having a particle size of 4 to 6.06 μm in the number distribution is P46, P46 / V46 is 0.5. It is preferable that the coefficient of variation in the volume average particle diameter is 15 to 18% and the coefficient of variation in the number particle size distribution is 15 to 20%.

  It is possible to prevent high-resolution image quality, and also prevent reverse transfer and dropout in tandem transfer, and achieve both oil-less fixing. The fine powder in the toner affects toner fluidity, image quality, storage stability, filming on the photosensitive member, developing roller, and transfer member, aging characteristics, transferability, particularly multi-layer transfer in the tandem system. Furthermore, it affects the non-offset property, glossiness and translucency in oilless fixing. In a toner containing a wax such as a wax for realizing oil-less fixing, the amount of fine powder affects the compatibility with tandem transferability. Particle formation is enabled by the toner manufacturing method of this embodiment.

  When the volume average particle size exceeds 7 μm, it is impossible to achieve both image quality and transfer. When the volume average particle size is less than 3 μm, it becomes difficult to handle the toner particles during development.

  If the content of toner base particles having a particle diameter of 2.52 to 4 μm in the number distribution is less than 10% by number, it is impossible to achieve both image quality and transfer. When it exceeds 75% by number, it becomes difficult to handle the toner base particles during development. In addition, filming on the photosensitive member, the developing roller, and the transfer member is likely to occur. Furthermore, fine powder tends to be offset because of its high adhesion to the heat roller. Further, in the tandem system, toner aggregation tends to be strong, and transfer failure of the second color is likely to occur during multilayer transfer. An appropriate range is required.

  If toner base particles having a particle size of 4 to 6.06 μm in the volume distribution exceed 75% by volume, it is impossible to achieve both image quality and transfer. When it is less than 30% by volume, the image quality is deteriorated.

  When toner mother particles having a particle size of 8 μm or more in the volume distribution are contained exceeding 5% by volume, the image quality is deteriorated. Causes transfer failure.

  When the volume% of toner base particles having a particle diameter of 4 to 6.06 μm in the volume distribution is V46, and the number% of toner base particles having a particle diameter of 4 to 6.06 μm in the number distribution is P46, When P46 / V46 is less than 0.5, the amount of fine powder present becomes excessive, resulting in poor fluidity, poor transferability, and poor background fog. When it is larger than 1.5, there are many large particles and the particle size distribution becomes broad, so that high image quality cannot be achieved.

  The purpose of defining P46 / V46 can be used as an index for making the toner particles small and narrowing the particle size distribution.

  The coefficient of variation is the standard deviation of the toner particle size divided by the average particle size. This is based on the particle diameter measured using a Coulter counter (Coulter). The standard deviation is expressed as the square root of the value obtained by dividing the square of the difference from the average value of each measured value when (n-1) is measured when n particle systems are measured.

  In other words, the coefficient of variation represents the extent of the particle size distribution, and if the coefficient of variation of the volume particle size distribution is less than 10% or the coefficient of variation of the number particle size distribution is less than 10%, it is difficult to produce, This will increase costs. When the variation coefficient of the volume particle size distribution is larger than 25% or the variation coefficient of the number particle size distribution is larger than 28%, the particle size distribution becomes broad, the toner cohesion becomes stronger, and the filming and transfer to the photosensitive member are performed. It is difficult to collect residual toner in a defective and cleaner-less process.

  The particle size distribution is measured by using a Coulter Counter TA-II type (Coulter Counter Co., Ltd.) and connecting an interface (manufactured by Nikkaki Co., Ltd.) for outputting the number distribution and volume distribution and a personal computer. The electrolyte solution is a surfactant (sodium lauryl sulfate) added to a concentration of 1%. About 2 mg of the toner to be measured is added to about 50 ml. The electrolyte solution in which the sample is suspended is dispersed for about 3 minutes with an ultrasonic disperser. And an aperture of 70 μm was used with a Coulter counter TA-II type. In the 70 μm aperture system, the particle size distribution measurement range is 1.26 μm to 50.8 μm, but the region less than 2.0 μm is not practical because the measurement accuracy and measurement reproducibility are low due to the influence of external noise and the like. Therefore, the measurement area was set to 2.0 μm to 50.8 μm.

Further, the degree of compression is calculated from the static bulk density and the dynamic bulk density, which is one of the indicators of toner fluidity. The fluidity of the toner is affected by the particle size distribution of the toner, the toner particle shape, the external additive, and the type and amount of the wax. When the toner particle size distribution is narrow and the amount of fine powder is small, the toner surface has few irregularities and the shape is nearly spherical, the amount of external additive added is large, or the particle size of the external additive is small, the degree of compression is small. The fluidity of the toner becomes higher. The degree of compression is preferably 5 to 40%. More preferably, it is 10 to 30%. It is possible to achieve both oilless fixing and tandem multi-layer transfer. If it is less than 5%, the fixability is lowered, and the translucency is particularly likely to deteriorate. Toner scattering tends to increase from the developing roller. Transferability greater than 40% is lowered, and tandem-type deficiency occurs and transfer failure occurs.
Carrier The carrier of this embodiment is preferably a carrier containing magnetic particles whose core material surface is coated with a fluorine-modified silicone resin containing an aminosilane coupling agent.

  More preferably, the carrier is a composite magnetic particle having at least magnetic particles and a binder resin, the magnetic particle surface of which is coated with a resin made of a fluorine-modified silicone resin containing an aminosilane coupling agent. used.

  A thermosetting resin is preferable as the binder resin constituting the magnetic particles in the present invention. Thermosetting resins include phenolic resins, epoxy resins, polyamide resins, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, xylene resins, acetoguanamine resins, furan resins, silicone resins, polyimide resins, urethane resins. These resins may be used alone or in combination of two or more, but preferably contain at least a phenol resin.

The composite particles in the present invention are preferably spherical particles having an average particle diameter of preferably 10 to 50 μm, more preferably 10 to 40 μm, still more preferably 10 to 30 μm, and most preferably 15 to 30 μm. Further, the specific gravity is 2.5 to 4.5, particularly 2.5 to 4.0, and the BET specific surface area by nitrogen adsorption of the carrier is preferably 0.03 to 0.3 m ² / g. When the average particle diameter of the carrier is less than 10 μm, the abundance ratio of the fine particles is high in the carrier particle distribution, and the carrier particles have a low magnetization per carrier particle, so that the carrier is easily developed on the photoreceptor. On the other hand, when the average particle of the carrier exceeds 50 μm, the specific surface area of the carrier particle becomes small and the toner holding force becomes weak, so that toner scattering occurs. In addition, a full color with many solid portions is not preferable because the reproduction of the solid portions is particularly poor.

  A conventional carrier having ferrite-based core particles has a large specific gravity of 5 to 6 and a particle diameter of 50 to 80 μm, so the BET specific surface area is small, and the mixing property when stirring with toner is small. However, when the toner is replenished, the charge rising property is insufficient and a large amount of toner is consumed, and when a large amount of toner is replenished, there is a tendency that a lot of fog occurs. If the density ratio between the toner and the carrier is not controlled within a narrow range, it is difficult to achieve both the image density, fogging and toner scattering reduction. However, by using a carrier having a large specific surface area value, even if the toner / carrier density ratio is controlled in a wide range, image quality is hardly deteriorated and toner density control can be performed roughly.

  Further, the above-described toner has a shape close to a sphere, and the specific surface area value also approaches the carrier. Therefore, the mixing property with the toner can be more uniformly mixed. When toner is replenished, it has good charge rise characteristics, and even if the toner / carrier density ratio is controlled over a wider range, image quality is unlikely to deteriorate, and both image density, fog and toner scattering are reduced. I can plan.

At this time, assuming that the specific surface area value of the toner is TS (m ² / g) and the specific surface area value of the carrier is CS (m ² / g), the TS / CS satisfies the relationship of 2 to 110, thereby stabilizing the image quality. Can be planned. Preferably it is 2-50, More preferably, it is 2-30. If it is less than 2, carrier adhesion tends to occur. On the other hand, if it is larger than 110, the density ratio between the toner and the carrier for reducing the image density, fogging and toner scattering is reduced, and the image quality is liable to deteriorate. A conventional carrier having ferrite-based core particles has a small specific surface area, and a conventional pulverized toner has an irregular shape and a large specific surface area.

  Composite magnetic particles are produced by reacting and curing phenols and aldehydes in the presence of magnetic particles and a basic catalyst while stirring the phenols and aldehydes in an aqueous medium. It can manufacture by the method of producing | generating the magnetic particle containing these.

  The average particle diameter of the obtained composite magnetic particles can be controlled by adjusting the stirring blade peripheral speed of the stirring device so that appropriate shearing and compaction are applied depending on the amount of water used.

  Production of composite particles using an epoxy resin as a binder resin is, for example, a method in which bisphenols, epihalohydrin, and lipophilic inorganic compound particle powder are dispersed in an aqueous medium and reacted in an alkaline aqueous medium. Can be mentioned.

  In the present invention, the content ratio between the magnetic fine particles of the composite magnetic particles and the binder resin is preferably 1 to 20% by mass of the binder resin and 80 to 99% by mass of the magnetic particles. When the content of the magnetic particles is less than 80 wt%, the saturation magnetization value becomes small, and when it exceeds 99 wt%, the binding between the magnetic particles by the phenol resin tends to be weak. Considering the strength of the composite magnetic particles, it is preferably 97 wt% or less.

  Magnetic fine particles include spinel ferrite such as magnetite and gamma iron oxide, and magnetoplumbites such as spinel ferrite and barium ferrite containing one or more metals other than iron (Mn, Ni, Zn, Mg, Cu, etc.). Type ferrite, fine particle powder of iron or alloy having an oxide layer on the surface can be used. The shape may be any of granular, spherical and acicular. In particular, when high magnetization is required, ferromagnetic fine particle powder such as iron can be used. However, considering chemical stability, magnetoplumbites such as spinel ferrite and barium ferrite containing magnetite and gamma iron oxide It is preferable to use ferromagnetic fine particle powder of type ferrite. By appropriately selecting the type and content of the ferromagnetic fine particle powder, composite particles having a desired saturation magnetization can be obtained.

In measurement under a magnetic field of 1000 oersted (79.57 kA / m), the strength of magnetization is 30 to 70 Am ² / kg, preferably 35 to 60 Am ² / kg, and the residual magnetization (σr) is 0.1 to 20 Am ² / kg, preferably 0.1 to 10 Am ² / kg, specific resistance value of 1 × 10 ⁶ to 1 × 10 ¹⁴ Ωcm, preferably 5 × 10 ^{6 to} 5 × 10 ¹³ Ωcm, more preferably 5 It is preferably × 10 ^{6 to} 5 × 10 ⁹ Ωcm.

  In the carrier production method according to the present invention, phenols and aldehydes are reacted in an aqueous medium in the presence of a basic catalyst in the presence of magnetic particles and a suspension stabilizer.

  As phenols used here, in addition to phenol, alkylphenols such as m-cresol, p-tert-butylphenol, o-propylphenol, resorcinol, bisphenol A, and a part or all of the benzene nucleus or alkyl group are included. Although the compound which has phenolic hydroxyl groups, such as halogenated phenol substituted by the chlorine atom or the bromine atom, is mentioned, Among these, phenol is the most preferable. When a compound other than phenol is used as the phenol, particles are difficult to form, or even if particles are formed, they may have an indeterminate shape. Therefore, phenol is most preferable in view of shape.

  The aldehydes used in the method for producing composite particles in the present invention include formaldehyde and furfural in the form of either formalin or paraformaldehyde, and formaldehyde is particularly preferable.

  Moreover, as resin used for the resin coating layer of this invention, a fluorine-modified silicone resin is essential. The fluorine-modified silicone resin is preferably a crosslinkable fluorine-modified silicone resin obtained from a reaction between a perfluoroalkyl group-containing organosilicon compound and polyorganosiloxane. The compounding ratio of the polyorganosiloxane and the perfluoroalkyl group-containing organosilicon compound is 3 parts by weight or more and 20 parts by weight or less of the perfluoroalkyl group-containing organosilicon compound with respect to 100 parts by weight of the polyorganosiloxane. Is preferred. Compared to the conventional coating on ferrite core particles, the adhesiveness of the composite magnetic particles in which the magnetic particles are dispersed in the curable resin is strengthened, and the effect of improving the durability is exhibited together with the chargeability described later.

  The polyorganosiloxane preferably exhibits at least one repeating unit selected from the following formulas (Formula 3) and (Formula 4).

Examples of the organosilicon compound containing a perfluoroalkyl group include CF ₃ CH ₂ CH ₂ Si (OCH ₃ ) ₃ , C ₄ F ₉ CH ₂ CH ₂ Si (CH ₃ ) (OCH ₃ ) ₂ , C ₈ F _{17 CH 2 CH 2 Si (OCH 3} ) 3, C 8 F 17 CH 2 CH 2 Si (OC 2 H 5) 3, (CF 3) 2 CF (CF 2) 8 CH 2 CH 2 Si (OCH 3) 3 , etc. In particular, those having a trifluoropropyl group are preferred.

  Moreover, in this embodiment, an aminosilane coupling agent is contained in the coating resin layer. As this aminosilane coupling agent, known ones may be used. For example, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, octadecylmethyl [3- (trimethoxy Cyril) propyl] ammonium chloride (from the top SH6020, SZ6023, AY43-021: trade names manufactured by Toray Dow Corning Silicone), KBM602, KBM603, KBE903, KBM573 (trade names manufactured by Shin-Etsu Silicone), etc. Primary amines are preferred. A secondary or tertiary amine substituted with a methyl group, ethyl group, phenyl group or the like is weak in polarity and has little effect on the charge rising characteristics with the toner. When the amino group is an aminomethyl group, aminoethyl group, or aminophenyl group, the most advanced silane coupling agent is a primary amine, but the amino group in a linear organic group extending from the silane. Does not contribute to the charge start-up characteristics with the toner and, conversely, is affected by moisture at high humidity, so it has the charge imparting ability with the initial toner due to the state-of-the-art amino group, but it has the charge imparting ability during printing durability. It will eventually drop and its life will be short.

  Therefore, by using such an aminosilane coupling agent and a fluorine-modified silicone resin in combination, negative chargeability can be imparted to the toner while ensuring a sharp charge amount distribution, and the toner is replenished. The toner has a quick charge rising property and can reduce the toner consumption. Furthermore, the aminosilane coupling agent expresses an effect like a crosslinking agent, improves the degree of crosslinking of the fluorine-modified silicone resin layer as the base resin, further improves the coating resin hardness, Separation and the like can be reduced, the spent resistance is improved, the decrease in charge imparting ability is suppressed, the charge is stabilized, and the durability is improved.

  Further, in the toner configuration described above, the surface of the toner to which a certain amount or more of the low melting point wax is added is substantially resin, so that the chargeability is somewhat unstable. For example, a case where the charging property is weak and the charging start-up property is slow is assumed, and the uniformity of fog and the whole surface of the solid image is deteriorated. By using the carrier in combination, the above problems are improved, the handling property in the developing device is improved, and the so-called development memory in which a history remains after collecting a solid image can be reduced.

  The use ratio of the aminosilane coupling agent is 5 to 40% by weight, preferably 10 to 30% by weight, based on the resin. If it is less than 5% by weight, the effect of the aminosilane coupling agent is not obtained and the charge imparting ability is not improved. If it exceeds 40% by weight, the degree of cross-linking of the resin coating layer becomes too high, and a charge-up phenomenon is likely to occur, which may cause image defects such as insufficient developability.

Further, in order to prevent charge-up in order to stabilize charging, the resin coating layer can contain conductive fine particles. Conductive fine particles include oil furnace carbon and acetylene black carbon black, semiconductive oxides such as titanium oxide and zinc oxide, powder surfaces such as titanium oxide, zinc oxide, barium sulfate, aluminum borate and potassium titanate. Examples thereof include tin oxide, carbon black, and those coated with metal, and those having a specific resistance of 10 ¹⁰ Ω · cm or less are preferable. The content in the case of using conductive fine particles is preferably 1 to 15% by weight. If the conductive fine particles are contained in a certain amount with respect to the resin coating layer, the filler effect increases the hardness of the resin coating layer by the filler effect. However, if the content exceeds 15% by weight, the formation of the resin coating layer is inhibited. However, it causes a decrease in adhesion and hardness. Further, the excessive content of the conductive fine particles in the full color developer causes the color stain of the toner transferred and fixed on the paper surface.

  The method for forming the coating layer on the composite magnetic particles is not particularly limited. For example, a known coating method, for example, an immersion method in which a powder that is a composite magnetic particle is immersed in a solution for forming a coating layer, or for forming a coating layer. Spray method of spraying the solution onto the surface of the composite magnetic particles, fluidized bed method of spraying the solution for forming the coating layer in a state where the composite magnetic particles are suspended by the flowing air, and the solution for forming the composite magnetic particles and the coating layer in a kneader coater In addition to wet coating methods such as the kneader coater method to remove the solvent, the powdered resin and composite magnetic particles are mixed at high speed, and the frictional heat is used to fuse the resin powder onto the surface of the composite magnetic particles. Any of these can be applied, and in the coating of a fluorine-modified silicone resin containing an aminosilane coupling agent in the present invention, wet coating is possible. The law is particularly preferably used.

  The solvent used in the coating layer forming coating solution is not particularly limited as long as it dissolves the coating resin, and can be selected so as to be compatible with the coating resin used. In general, for example, aromatic hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, and ethers such as tetrahydrofuran and dioxane can be used.

  The resin coating amount is preferably 0.2 to 6.0% by weight, more preferably 0.5 to 5.0% by weight, still more preferably 0.6 to 4.0% by weight, and 0.0% by weight based on the composite magnetic particles. 7 to 3% by weight. If the coating amount of the resin is less than 0.2% by weight, a uniform coating cannot be formed on the surface of the composite magnetic particles, and the influence of the characteristics of the composite magnetic particles is greatly affected, and the fluorine-modified silicone of the present invention The effect of the resin and the aminosilane coupling agent cannot be fully exhibited. When the content exceeds 6.0% by weight, the coating layer becomes too thick, and the composite magnetic particles are granulated, and uniform composite magnetic particles tend not to be obtained.

Thus, after coating the fluorine-modified silicone resin containing an aminosilane coupling agent on the surface of the composite magnetic particles, it is preferable to perform a baking treatment. The means for performing the baking process is not particularly limited, and may be either an external heating system or an internal heating system, for example, a fixed or fluid electric furnace, a rotary kiln electric furnace, or a burner furnace. Or it may be baked by microwave. However, with regard to the temperature of the baking treatment, in order to efficiently express the effect of the fluorine silicone that improves the spent resistance of the resin coating layer, the treatment is preferably performed at a high temperature of 200 to 350 ° C., more preferably 220-280 ° C. The treatment time is preferably 1.5 to 2.5 hours. When the treatment temperature is low, the hardness of the coating resin itself is lowered. If the processing temperature is too high, charge reduction occurs.
Two-component development An AC bias is applied together with a DC bias between the photoconductor and the developing roller.
The frequency at that time is 1 to 10 kHz, the AC bias is 1.0 to 2.5 kV (pp), and the peripheral speed ratio between the photoconductor and the developing roller is 1: 1.2 to 1: 2. It is preferable.

  More preferably, the frequency is 3.5 to 8 kHz, the AC bias is 1.2 to 2.0 kV (pp), and the peripheral speed ratio between the photosensitive member and the developing roller is 1: 1.5 to 1: 1. .8.

  More preferably, the frequency is 5.5 to 7 kHz, the AC bias is 1.5 to 2.0 kV (pp), and the peripheral speed ratio between the photosensitive member and the developing roller is 1: 1.6 to 1: 1. .8.

  With this development process configuration and the use of the toner or the two-component developer of the present embodiment, dots can be faithfully reproduced and development γ characteristics can be obtained. Both high-quality images and oilless fixability can be achieved. Further, even a high-resistance carrier can prevent charge-up under low humidity, and a high image density can be obtained even in continuous use.

  Even if the toner surface is almost resin-based, the combined use of this carrier composition and AC bias can reduce adhesion to the carrier, maintain image density, reduce fog, and reproduce dots faithfully. Seem.

  If the frequency is less than 1 kHz, dot reproducibility deteriorates and halftone reproducibility deteriorates. When the frequency is higher than 10 kHz, the development region cannot be followed and the effect does not appear. In this frequency range, in the two-component development using a high resistance carrier, it works to reciprocate between the carrier and the toner rather than between the developing roller and the photosensitive member, and has the effect of slightly releasing the toner from the carrier. Good reproducibility and halftone reproducibility are achieved, and a high image density can be obtained.

When the AC bias is smaller than 1.0 kV (pp), the effect of suppressing charge-up cannot be obtained, and when the AC bias is larger than 2.5 kV (pp), the fog increases. If the peripheral speed ratio between the photoconductor and the developing roller is smaller than 1: 1.2 (the developing roller becomes slow), it is difficult to obtain image density. When the peripheral speed ratio between the photosensitive member and the developing roller is larger than 1: 2 (the developing roller speed is increased), toner scattering increases.
Tandem Color Process In order to form a color image at high speed, this embodiment has a plurality of toner image forming stations including a photoconductor, a charging unit, and a toner carrier, and an electrostatic latent image formed on the image carrier. A primary transfer process in which an endless transfer member is brought into contact with the image bearing member and transferred to the transfer member is successively performed in succession, and a multi-layer transfer is performed on the transfer member. In a transfer process configured to execute a secondary transfer process in which a toner image is formed and then a multi-layer toner image formed on the transfer body is collectively transferred to a transfer medium such as paper or OHP. When the distance from the first primary transfer position to the second primary transfer position is d1 (mm) and the peripheral speed of the photosensitive member is v (mm / s), the transfer position configuration is d1 / v ≦ 0.65. Take a small machine It is intended to achieve both mold formation and printing speed. In order to realize a miniaturization that can process more than 20 sheets per minute (A4) and the machine can be used for SOHO (Small Office, Home Office) applications, it is possible to shorten the process between multiple toner image forming stations and process A configuration that increases the speed is essential. In order to achieve both a reduction in size and a printing speed, a configuration in which the above value is 0.65 or less is considered a minimum.

  However, when the configuration between the toner image forming stations is short, for example, the time from the primary transfer of the yellow toner of the first color to the primary transfer of the next magenta toner of the second color is extremely short. There is almost no charge relaxation or charge relaxation of the transferred toner, and when transferring the magenta toner onto the yellow toner, the magenta toner is repelled by the charge action of the yellow toner, the transfer efficiency decreases, The problem of hollowing out occurs. Further, during the primary transfer of the cyan toner of the third color, the cyan toner splatters, transfer defects, and transfer omissions occur remarkably when transferred onto the previous yellow and magenta toners. Furthermore, during repeated use, toner of a specific particle size is selectively developed, and if the fluidity of each toner particle differs greatly, the chance of frictional charging differs, resulting in variation in charge amount and further deterioration in transferability. Will be invited.

Therefore, by using the toner of this embodiment or the two-component developer, since the raw particle size has a sharp particle size distribution, the charge distribution is stabilized, and overcharge of the toner can be suppressed and fluidity fluctuation can be suppressed. . For this reason, it is possible to prevent transfer efficiency from being lowered, character dropout during transfer, and reverse transfer without sacrificing fixing characteristics.
Cleaner-less process In addition, the basic configuration of this embodiment is a cleaner-less process that performs the following charging, exposure, and development processes without having a cleaning process that collects toner remaining on the photoconductor by cleaning after the transfer process. The electrophotographic apparatus is also preferably used.

By using the toner or the two-component developer of this embodiment, toner aggregation is suppressed, overcharging is prevented, charging property is stabilized, and high transfer efficiency can be obtained. Further, the improvement in uniform dispersibility in the resin, good chargeability, and the releasability of the material make it possible to recover the toner remaining in the non-image area during development. For this reason, there is no development memory in which the image pattern in front of the non-image portion remains.
Oilless Color Fixation In this embodiment, the present invention is suitably used for an electrophotographic apparatus having a fixing process having an oilless fixing configuration in which oil is not used as a means for fixing toner. As the heating means, electromagnetic induction heating is a preferable configuration from the viewpoint of shortening the warm-up time and saving energy. A heating and pressurizing unit having at least a magnetic field generating unit, a rotary heating member having at least a heat generation layer and a release layer generated by electromagnetic induction, and a rotary pressurizing member forming a fixed nip with the rotary heating member; In this configuration, a transfer medium such as copy paper on which toner is transferred is passed between the rotary heating member and the rotary pressure member, and is fixed.

  As a feature, the warm-up time of the rotary heating member is very fast compared to the case where a conventional halogen lamp is used. For this reason, since the copying operation is started in a state where the temperature of the rotary pressure member is not sufficiently raised, low temperature fixing and a wide range of offset resistance are required.

  As a configuration, a configuration using a fixing belt in which a heating member and a fixing member are separated is also preferably used. As the belt, a heat resistant belt such as a nickel electroformed belt or a polyimide belt having heat resistance and deformability is preferably used. In order to improve releasability, silicone rubber, fluororubber, or fluororesin is used as the surface layer.

  In these fixing processes, release oil has been applied so far to prevent offset. It is no longer necessary to apply release oil with toner having releasability without using oil. However, if the release oil is not applied, it is easy to be charged, and when an unfixed toner image comes close to the heating member or the fixing member, toner jump may occur due to the influence of charging. It tends to occur especially at low temperatures and low humidity.

  Therefore, by using the toner of this embodiment, low temperature fixing and a wide range of offset resistance can be realized without using oil, and high color translucency can be obtained. Further, the toner can be prevented from being overcharged, and toner flying due to the charging action with the heating member or the fixing member can be suppressed.

(Example of carrier core material production)
A 1 liter flask was charged with 52 g of phenol, 75 g of 37% formalin, 400 g of spherical magnetite particles having an average particle size of 0.24 μm, 15 g of 28% ammonia water, 1.0 g of calcium fluoride and 50 g of water while stirring. After raising the temperature to 85 ° C. for 60 minutes, the composite magnetic particles composed of phenol resin and spherical magnetite particles were generated by reacting and curing at the same temperature for 120 minutes.

  Next, after the contents in the flask were cooled to 30 ° C., 0.5 liter of water was added thereto, the supernatant was removed, and the lower layer precipitate was washed with water and air-dried. Subsequently, this was dried at 50-60 degreeC under pressure reduction (5 mmHg or less), and the composite magnetic particle (carrier core material A) was obtained.

  A 1 liter flask was charged with 50 g of phenol, 65 g of 37% formalin, 450 g of spherical magnetite particles having an average particle size of 0.24 μm, 15 g of 28% ammonia water, 1.0 g of calcium fluoride and 50 g of water while stirring. After raising the temperature to 85 ° C. for 60 minutes, the composite magnetic particles composed of phenol resin and spherical magnetite particles were generated by reacting and curing at the same temperature for 120 minutes.

  Next, after the contents in the flask were cooled to 30 ° C., 0.5 liter of water was added thereto, the supernatant was removed, and the lower layer precipitate was washed with water and air-dried. Subsequently, this was dried at 50-60 degreeC under pressure reduction (5 mmHg or less), and the composite magnetic particle (carrier core material B) was obtained.

  A 1 liter flask is charged with 47.5 g of phenol, 62 g of 37% formalin, 480 g of spherical magnetite particles having an average particle size of 0.24 μm, 15 g of 28% ammonia water, 1.0 g of calcium fluoride and 50 g of water, and stirred. Then, the temperature was raised to 85 ° C. over 60 minutes, and then reacted and cured at the same temperature for 120 minutes to produce composite magnetic particles composed of phenol resin and spherical magnetite particles.

  Next, after the contents in the flask were cooled to 30 ° C., 0.5 liter of water was added thereto, the supernatant was removed, and the lower layer precipitate was washed with water and air-dried. Next, this was dried at 50 to 60 ° C. under reduced pressure (5 mmHg or less) to obtain composite magnetic particles (carrier core material C).

As a comparative example, a core material d of ferrite particles having an average particle size of 80 μm and a saturation magnetization of 65 Am ² / kg when the applied magnetic field is 238.74 kA / m (3000 oersted) was used.
(Carrier production example 1)
Next, R ₁ and R ₂ represented by the following formula (Chemical Formula 5) are methyl groups, that is, (CH ₃ ) ₂ SiO _2/2 unit is 15.4 mol%, and R ₃ represented by the following Formula (Chemical Formula 6) is A fluorine-modified silicone resin was obtained by reacting 250 g of a polyorganosiloxane having a methyl group, that is, 84.6 mol% of CH ₃ SiO _3/2 units, and 21 g of CF ₃ CH ₂ CH ₂ Si (OCH ₃ ) ₃ . Further, 100 g of the fluorine-modified silicone resin in terms of solid content and 10 g of aminosilane coupling agent (γ-aminopropyltriethoxysilane) were weighed and dissolved in 300 cc of toluene solvent.

  The carrier core material A10 kg was coated by using the immersion drying type coating apparatus and stirring the coating resin solution for 20 minutes. Thereafter, baking was performed at 260 ° C. for 1 hour to obtain carrier A1.

The carrier A1 is a spherical particle having a spherical magnetite particle content of 80.4% by mass, an average particle diameter of 30 μm, a specific gravity of 3.05, a magnetization value of 61 Am ² / kg, and a volume resistivity of 3 × 10 ⁹ Ωcm, specific surface area was 0.098 m ² / g.
(Carrier production example 2)
Production Example 1, except that using a carrier core _B, and changes the _{CF 3 CH 2 CH 2 Si (} OCH 3) 3 to _{C 8 F 17 CH 2 CH 2} Si (OCH 3) 3 is as in Preparation Example 1 Carrier B1 was obtained in the same process.

The carrier B1 is a spherical particle having a spherical magnetite particle content of 88.4% by mass, an average particle diameter of 45 μm, a specific gravity of 3.56, a magnetization value of 65 Am ² / kg, and a volume resistivity of 8 × 10 ¹⁰ Ωcm, specific surface area 0.057 m ² / g.
(Carrier production example 3)
In Production Example 1, the same procedure as in Production Example 1 was conducted except that carrier core material C was used and conductive carbon (EC made by Ketjen Black International Co., Ltd.) was dispersed in a ball mill in an amount of 5 wt% based on the resin solid content. Carrier C1 was manufactured in the process.

The carrier C1 is a spherical particle having a spherical magnetite particle content of 92.5% by mass, an average particle diameter of 48 μm, a specific gravity of 3.98, a magnetization value of 69 Am ² / kg, and a volume resistivity of 2 × 10 ⁷ Ωcm, specific surface area was 0.043 m ² / g.
(Carrier Production Example 4)
In Production Example 1, Carrier A2 was produced in the same process as Production Example 1 except that the amount of aminosilane coupling agent added was changed to 30 g.

The carrier A2 is a spherical particle having a spherical magnetite particle content of 80.4% by mass, an average particle diameter of 30 μm, a specific gravity of 3.05, a magnetization value of 61 Am ² / kg, and a volume resistivity of 2 × 10 ¹⁰ Ωcm, specific surface area 0.01 m ² / g.
(Carrier Production Example 5)
Except having changed the addition amount of the aminosilane coupling agent into 50g, the core material was manufactured in the process similar to the manufacture example 1, it coated, and carrier a1 was obtained.
(Carrier Production Example 6)
100 g of straight silicone (SR-2411 manufactured by Toray Dow Corning Co., Ltd.) as a solid content was weighed as a coating resin and dissolved in 300 cc of a toluene solvent. Coating was performed on the ferrite particles d10 kg by using an immersion drying type coating apparatus and stirring the coating resin solution for 20 minutes. Thereafter, baking was performed at 210 ° C. for 1 hour to obtain a carrier d2. The average particle size was 80 μm, the specific gravity was 6, the magnetization value was 75 Am ² / kg, the volume resistivity was 2 × 10 ¹² Ωcm, and the specific surface area was 0.024 m ² / g.
(Carrier Production Example 7)
100 g of an acrylic modified silicone resin (KR-9706, manufactured by Shin-Etsu Chemical Co., Ltd.) as a solid content was weighed and dissolved in a 300 cc toluene solvent. Coating was performed on the ferrite particles d10 kg by using an immersion drying type coating apparatus and stirring the coating resin solution for 20 minutes. Thereafter, baking was performed at 210 ° C. for 1 hour to obtain a carrier d3. The average particle diameter was 80 μm, the specific gravity was 6, the magnetization value was 75 Am ² / kg, the volume resistivity was 2 × 10 ¹¹ Ωcm, and the specific surface area was 0.022 m ² / g.
(Example 1)
Next, examples of the toner of the present invention will be described, but the present invention is not limited to these examples.
[Creation of resin dispersion]
Table 1 shows the characteristics of the resin used. Mn is a number average molecular weight, Mw is a weight average molecular weight, Mz is a Z average molecular weight, Mp is a molecular weight peak value, Tm (° C.) is a softening point, and Tg (° C.) is a glass transition point. Styrene, n-butyl acrylate, and acrylic acid indicate the amount (g).

(1) Preparation of resin particle dispersion RL1 A monomer liquid consisting of 96 g of styrene, 24 g of n-butyl acrylate, and 3.6 g of acrylic acid was added to 200 g of ion-exchanged water with a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd.). : Nonipol 400) 2.5g, anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen RK) 0.5g, dodecanethiol 6g, carbon tetrabromide 1.2g, dispersed in this, potassium persulfate 1.2g was added and emulsion polymerization was performed at 70 degreeC for 6 hours. Thereafter, aging treatment is further performed at 90 ° C. for 3 hours, and resin particles having Mn of 3700, Mw of 11200, Mz of 38800, Mp of 8100, Tm of 110 ° C., Tg of 42 ° C., and median diameter of 0.12 μm are dispersed. A resin particle dispersion RL1 was prepared.
(2) Preparation of Resin Particle Dispersion RL2 A monomer liquid composed of 204 g of styrene, 36 g of n-butyl acrylate, and 3.6 g of acrylic acid was added to 400 g of ion-exchanged water with a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd.). : Elminol NA400) 3.6 g, anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen RK) 2.4 g, dodecanethiol 6 g, carbon tetrabromide 1.2 g, and dispersed in persulfate. 1.2 g of potassium was added, and emulsion polymerization was performed at 70 ° C. for 5 hours. Thereafter, aging treatment is further performed at 90 ° C. for 5 hours, and resin particles having Mn of 6200, Mw of 62400, Mz of 269000, Mp of 8100, Tm of 127 ° C., Tg of 56 ° C., and median diameter of 0.18 μm are dispersed. A resin particle dispersion RL2 was prepared.
(3) Preparation of resin particle dispersion RL3 A monomer liquid composed of 204 g of styrene, 36 g of n-butyl acrylate, and 3.6 g of acrylic acid was added to 400 g of ion-exchanged water with a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd.). : Erminol NA400) 6 g, dodecanethiol 12 g, carbon tetrabromide 2.4 g was dispersed, potassium persulfate 1.2 g was added thereto, and emulsion polymerization was performed at 70 ° C. for 5 hours. Thereafter, aging treatment is further performed at 90 ° C. for 2 hours, and resin particles having Mn of 2800, Mw of 18800, Mz of 95400, Mp of 3700, Tm of 105 ° C., Tg of 47 ° C., and median diameter of 0.18 μm are dispersed. A resin particle dispersion RL3 was prepared.
(4) Preparation of resin particle dispersion RH4 A monomer liquid consisting of 102 g of styrene, 18 g of n-butyl acrylate, and 1.8 g of acrylic acid was added to 200 g of ion-exchanged water with a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd.). : Nonipol 400) 2.5 g, anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen RK) 0.5 g, dodecanethiol 0 g, carbon tetrabromide 0 g was dispersed in this solution. 2 g was added and emulsion polymerization was carried out at 70 ° C. for 5 hours. Resin having Mn of 44500, Mw of 273000, Mz of 581000, Mp of 182000, Tm of 199 ° C., Tg of 78 ° C., and median diameter of 0.12 μm A resin particle dispersion RH4 in which particles were dispersed was prepared.
(5) Preparation of resin particle dispersion RH5 A monomer liquid consisting of 102 g of styrene in which 4 g of an aluminum salicylate metal complex (Orient Chemical Co., Ltd .: E88) was melted, 18 g of n-butyl acrylate, and 1.8 g of acrylic acid was ionized. Disperse in 200 g of exchange water using 3 g of nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Erminol NA400), 0 g of dodecanethiol, 0 g of carbon tetrabromide, and 1.2 g of potassium persulfate was added thereto. Resin in which resin particles having an Mn of 40900, Mw of 252000, Mz of 578000, Mp of 154000, Tm of 194 ° C., Tg of 76 ° C. and a median diameter of 0.22 μm are dispersed by emulsion polymerization at 70 ° C. for 5 hours. A particle dispersion RH5 was prepared.
(Example 2)
[Creation of pigment dispersion]
Table 2 shows the pigments used.

(1) Preparation of Colorant Particle Dispersion Liquid PM1 20 g of magenta pigment (KETRED309 manufactured by Dainippon Ink and Chemicals), 2 g of a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Erminol NA400), and 78 g of ion-exchanged water are mixed. Dispersion was carried out for 20 minutes at an oscillation frequency of 30 kHz using a sonic disperser to prepare a colorant particle dispersion PM1 in which colorant particles having a median diameter of 0.12 μm were dispersed.
(2) Preparation of Colorant Particle Dispersion PC1 20 g of cyan pigment (KETBLUE111 manufactured by Dainippon Ink & Chemicals), 2 g of nonionic surfactant (manufactured by Sanyo Chemical Co., Ltd .: Erminol NA400), and 78 g of ion-exchanged water are mixed. Dispersion was performed for 20 minutes at an oscillation frequency of 30 kHz using a sonic disperser to prepare a colorant particle dispersion PC1 in which colorant particles having a median diameter of 0.12 μm were dispersed.
(3) Preparation of colorant particle dispersion PY1 20 g of yellow pigment (PY74 manufactured by Sanyo Dye), 2 g of nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Erminol NA400), and 78 g of ion-exchanged water are mixed and ultrasonically mixed. Using a disperser, dispersion was performed at an oscillation frequency of 30 kHz for 20 minutes to prepare a colorant particle dispersion PY1 in which colorant particles having a median diameter of 0.12 μm were dispersed.
(4) Preparation of Colorant Particle Dispersion PB1 20 g of black pigment (MA100S manufactured by Mitsubishi Chemical Corporation), 2 g of nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Erminol NA400), and 78 g of ion-exchanged water are mixed and ultrasonically mixed. Using a disperser, dispersion was performed at an oscillation frequency of 30 kHz for 20 minutes to prepare a colorant particle dispersion PB1 in which colorant particles having a median diameter of 0.12 μm were dispersed.
Example 3
[Creation of wax dispersion]
The properties of the waxes used are shown in (Table 3), (Table 4), (Table 5), and (Table 6). Mnr is a number average molecular weight, Mwr is a weight average molecular weight, Mzr is a Z average molecular weight, Mpr is a peak value of molecular weight, Tmw (° C.) is a melting point, and Ck (wt%) is a weight loss by heating. In the cumulative volume particle size distribution from the small particle size side, PR16 indicates a 16% diameter, PR50 indicates a 50% diameter, and PR84 indicates an 84% diameter.

(1) Preparation of Wax Particle Dispersion WA1 FIG. 3 is a schematic view of a stirring and dispersing apparatus, and FIG. 4 is a view seen from above. Reference numeral 801 denotes an outer tank, in which cooling water is injected from 808 and discharged from 807. Reference numeral 802 denotes a dam plate that stops the liquid to be processed, and a hole is formed in the central portion. Reference numeral 803 denotes a rotating body that rotates at a high speed and is fixed to the shaft 806 and can rotate at a high speed. A hole of about 1 to 5 mm is formed on the side surface of the rotating body, and the liquid to be processed can be moved. The tank is 120 ml, and about half of the liquid to be treated is charged. The speed MAX of the rotating body can be up to 50 m / s. The diameter of the rotating body is 52 mm, and the inner diameter of the tank is 56 mm. Reference numeral 44 denotes a raw material inlet for continuous processing. Sealed during high-pressure processing or batch processing.

70 g of ion-exchanged water, 1.2 g of nonionic surfactant (manufactured by Sanyo Chemical Co., Ltd .: Elminol NA400), 0.8 g of anionic surfactant (SCF manufactured by Sanyo Chemical Industries, Ltd.), 28 g of wax (W-1) The speed of the rotating body was 20 min / s for 5 min, and then the rotating speed was increased to 50 m / s for 2 min. The liquid temperature in the tank rose to 92 ° C. The heat melted the wax, and a fine wax particle dispersion WA1 was formed by a strong shearing force.
(2) Preparation of wax particle dispersion WA2
Under the same conditions as in (1), 70 g of ion-exchanged water, 2 g of a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Elminol NA400) and 28 g of wax (W-2) were charged, and the speed of the rotating body was 20 m. / S for 3 min, and then the rotational speed was increased to 45 m / s, followed by 2 min treatment to form a wax particle dispersion WA2.
(3) Preparation of wax particle dispersion WA3
Under the same conditions as in (1), 70 g of ion-exchanged water, 1.8 g of a nonionic surfactant (New Coal 565C manufactured by Nippon Emulsifier Co., Ltd.), 0.2 g of an anionic surfactant (SCF manufactured by Sanyo Chemical Industries Co., Ltd.), wax ( W-3) was charged with 28 g, and the speed of the rotating body was 3 minutes at 20 m / s, and then the rotational speed was increased to 50 m / s, followed by treatment for 2 minutes to form a wax particle dispersion WA3.
(4) Preparation of wax particle dispersion WA4
Under the same conditions as in (1), 70 g of ion-exchanged water, 2 g of a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Elminol NA200), and 28 g of wax (W-4) were charged, and the speed of the rotating body was 20 m. / Min for 3 min, and then the rotational speed was increased to 50 m / s for 1 min to form a wax particle dispersion WA4.
(5) Preparation of wax particle dispersion WA5
Under the same conditions as in (1), 70 g of ion-exchanged water, 1.5 g of nonionic surfactant (Sanyo Kasei Co., Ltd .: Elminol NA400), 0.5 g of anionic surfactant (Syoyo Kasei Kogyo SCF) Then, 28 g of wax (W-5) was charged, and the speed of the rotating body was 3 minutes at 20 m / s, and then the rotational speed was increased to 45 m / s, followed by treatment for 4 minutes to form a wax particle dispersion WA5.
(6) Preparation of wax particle dispersion WA6
Under the same conditions as in (1), 70 g of ion-exchanged water, 2 g of nonionic surfactant (manufactured by Sanyo Chemical Co., Ltd .: Erminol NA200), wax (W− 6) 28 g was charged, and the speed of the rotating body was 3 minutes at 20 m / s, and then the rotational speed was increased to 45 m / s for 4 minutes to form a wax particle dispersion WA6.

(7) Preparation of Wax Particle Dispersion WA7 FIG. 5 shows a schematic view of a stirring and dispersing apparatus, and FIG. 6 shows a view from above. Reference numeral 850 denotes a raw material inlet, and reference numeral 852 denotes a fixed body having a floating structure. A narrow gap of about 1 μm to 10 μm is formed by the pressing force of the spring 851 and the pushing force of the rotating body 853 and the high speed rotating force. Reference numeral 854 denotes a shaft connected to a motor (not shown). The raw material charged from 850 receives a strong shearing force between the gap between the stationary body and the rotating body, and is dispersed into fine particles in the liquid. The processed raw material liquid is discharged from 856. FIG. 6 shows a view from above. The discharged raw material liquid 855 is blown radially and collected in a sealed container. The outer diameter of the rotating body is 100 mm.

  The raw material liquid is pre-dispersed with a wax and a surfactant in an aqueous medium that has been heated under pressure in advance, and is introduced into the inlet 80 to be instantly refined. The supply amount was 1 kg / h, and the rotating body was rotated at a maximum speed of 100 m / s.

Charged with 70 g of ion-exchanged water, 2 g of nonionic surfactant (manufactured by Sanyo Chemical Co., Ltd .: Elminol NA400), 28 g of wax (W-7), the speed of the rotating body is 100 m / s, and the supply rate is 1 kg / h. The wax particle dispersion WA7 was formed.
(8) Preparation of wax particle dispersion WA8
Under the same conditions as in (6), 70 g of ion-exchanged water, 2 g of a nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Elminol NA200), and 28 g of wax (W-8) were charged, and the speed of the rotating body was 20 m. / S for 3 minutes, and then the rotational speed was increased to 45 m / s, followed by treatment for 4 minutes to form a wax particle dispersion WA8.
(10) Preparation of Wax Particle Dispersion Wa10 70 g of ion-exchanged water, 0.8 g of nonionic surfactant (manufactured by Sanyo Chemical Co., Ltd .: Elminol NA200), anionic surfactant (SCF manufactured by Sanyo Chemical Industries, Ltd.) 1 0.2 g and 28 g of paraffin wax (HNP-10, Nippon Seiki Co., Ltd., melting point: 75 ° C.) were charged and treated with a homogenizer for 30 minutes to form a wax particle dispersion wa10.
(11) Preparation of Wax Particle Dispersion Wa11 70 g of ion-exchanged water, nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Elminol NA200) 0.5 g, anionic surfactant (SCF manufactured by Sanyo Kasei Kogyo Co., Ltd.) 1 0.5 g and Fischer-Tropsch wax (FT0070 manufactured by Nihon Seiki Co., Ltd., melting point: 72 ° C.) (28 g) were charged and treated with a homogenizer for 30 minutes to form a wax particle dispersion wa11.
(12) Preparation of Wax Particle Dispersion Wa12 70 g of ion-exchanged water, 2 g of an anionic surfactant (SCF manufactured by Sanyo Kasei Kogyo Co., Ltd.), and 28 g of a hydrocarbon wax (LUVAX 2191 manufactured by Nippon Seiki Co., Ltd., melting point 83 ° C.) Then, it was treated with a homogenizer for 30 minutes, and a wax particle dispersion wa12 was formed.

Example 4
[Create toner base]
Table 7 shows the composition of the toner as a prototype of the toner.

(1) Preparation of toner base M1 A 2000 ml four-necked flask having a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL2, 30 g of the colorant particle dispersion PM1, and the first wax dispersion WA1 60 g was added, 350 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 5.7.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.8, and then 280 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 80 ° C., and heat treatment was performed for 1 hour. The pH of the obtained dispersion was 9.2. Thereafter, 1N HCl was further added, the pH was adjusted to 6.6, the temperature was raised to 80 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is set to 8.6, 40 g of the second wax dispersion WA6 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. Then, the pH was adjusted to 6.6, and the mixture was heated at 95 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was set to 60 ° C., the pH was set to 6.6, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours under the condition of the water temperature of 95 ° C. to obtain resin fused particles.

  After cooling, the product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M1 having a volume average particle size of 4.6 μm and a coefficient of variation of 19.8.

  When the pH of the mixed dispersion before the addition of the water-soluble inorganic salt and before the heating is adjusted, if it is lower than 9.5, the formed core particles become coarse. When the pH was 12.5, the amount of free wax increased, making it difficult to encapsulate the wax uniformly. If the pH of the liquid when the core particles are formed is higher than 9.5, the free wax increases due to poor aggregation.

  When the pH before the addition of the second wax dispersion (WA6 in this example) was 5.0, the wax particles hardly adhered to the core particles, and the number of free particles increased. Moreover, when pH was set to 9.0, the secondary aggregation of core particles generate | occur | produced and particle | grains coarsened to about 20 micrometers or more.

If the pH before adding the second resin particle dispersion (RH4 in this example) is 3.0, the second resin particles are less likely to adhere to the wax-adhering particles, and the free resin and wax particles Increased. Moreover, when pH was set to 7.0, the secondary aggregation of particle | grains generate | occur | produced and the particle | grains coarsened to about 15 micrometers.
(2) Preparation of toner base M2 A 2000 ml four-necked flask with a thermometer and a cooling tube was charged with 204 g of the first resin particle dispersion RL2, 30 g of the colorant particle dispersion PM1, and the first wax dispersion WA2. 65 g was added, 350 ml of ion-exchanged water was added, and mixed for 10 min using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 2.8.

    Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 9.7, and then 280 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 80 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 7.2. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is adjusted to 5, 40 g of the wax dispersion WA7 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added to adjust the pH. As 3.4, wax-adhered particles were obtained by heating at 90 ° C. for 1 hour.

  Further, the water temperature was set to 60 ° C., the pH was set to 3.4, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours at a water temperature of 95 ° C. to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. The toner base thus obtained was dried at 40 ° C. for 6 hours with a fluid dryer, and the volume average particle size was 6.4 μm and the coefficient of variation was 18.4. Toner base M2 was obtained.
(3) Preparation of toner base M3 In a four-necked flask with 2000 ml of a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL2, 30 g of the colorant particle dispersion PM1, and the first wax dispersion WA3 60 g was added, 350 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 4.2.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.2, and then 270 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 85 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 8.5. Thereafter, 1N HCl was further added, the pH was adjusted to 5.4, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is set to 7, 45 g of wax dispersion WA8 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added to adjust the pH. As 5.0, wax-adhered particles were obtained by heating at 95 ° C. for 1 hour.

  Further, the water temperature was set to 60 ° C., the pH was set to 5.0, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours under the condition of the water temperature of 95 ° C. to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid dryer, and the volume average particle diameter was 5.1 μm and the coefficient of variation was 17.8. A toner base M3 was obtained.
(4) Preparation of toner base M4 In a four-necked flask 2000 ml with a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL1, 30 g of the colorant particle dispersion PM1, and the first wax dispersion WA4 60 g was added, 350 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 5.8.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.9, and then 280 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 80 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 9.3. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is adjusted to 8.6, 45 g of the wax dispersion WA6 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. The pH was set at 6.6, and the mixture was heated at 95 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was set to 60 ° C., the pH was set to 3.4, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours at a water temperature of 95 ° C. to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M4 having a volume average particle size of 4.8 μm and a coefficient of variation of 16.1.
(5) Preparation of toner base M5 In a four-necked flask with 2000 ml of a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL3, 30 g of the colorant particle dispersion PM1, and the first wax particle dispersion WA5 Was added, 350 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Tarrax T50) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 2.2.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 9.7, and then 270 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 85 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 7.2. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is set to 5.0, 45 g of the second wax dispersion WA7 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. Then, the pH was set to 3.4 and heated at 90 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was 60 ° C., the pH was 3.4, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours under the condition of the water temperature of 90 ° C. to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M5 having a volume average particle size of 6.6 μm and a coefficient of variation of 19.2.
(6) Preparation of toner base M6 In a four-necked flask with 2000 ml of a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL1, 30 g of the colorant particle dispersion PM1, and the first wax particle dispersion WA1 Was added, 360 ml of ion-exchanged water was added, and the mixture was mixed for 10 min using a homogenizer (manufactured by IKA: Ultra Turrax T50) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 3.8.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.2, and then 290 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 85 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 8.5. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is set to 5.0, 50 g of the second wax dispersion WA8 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. Then, the pH was set to 3.4, and heated at 85 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was 60 ° C., the pH was 3.4, 43 g of the second shell resin particle dispersion RH4 was added, and heat treatment was performed for 3 hours under the condition of the water temperature of 90 ° C. to obtain resin fused particles.

  Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M6 having a volume average particle size of 5.1 μm and a coefficient of variation of 16.1.

(7) Preparation of toner base M7 In a 4-ml flask having a thermometer and a cooling tube, 2000 ml, 204 g of the first resin particle dispersion RL3, 30 g of the colorant particle dispersion PM1, and the first wax particle dispersion WA2 Was added, 370 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (IKA: Ultra Turrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 4.2.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.2, and then 290 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 85 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 8.5. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is 60 ° C., 1N NaOH is added, the pH is 5.0, 50 g of wax dispersion WA6 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. The pH was set to 3.4, and the mixture was heated at 95 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was set to 60 ° C., the pH was set to 3.4, 43 g of the second shell resin particle dispersion RH5 was added, and heat treatment was performed at a water temperature of 90 ° C. for 3 hours to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours with a fluid dryer to obtain a toner base M7 having a volume average particle size of 4.8 μm and a coefficient of variation of 17.5.
(8) Preparation of toner base M8 In a four-necked flask with 2000 ml of a thermometer and a cooling tube, 204 g of the first resin particle dispersion RL3, 30 g of the colorant particle dispersion PM1, and the first wax particle dispersion WA3 90 g and ion-exchanged water 380 ml were added and mixed for 10 min using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 4.3.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.6, and then 310 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 minutes. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 85 ° C. and treated for 5 hours to obtain core particles. The obtained core particle dispersion had a pH of 8.7. Thereafter, 1N HCl was further added, the pH was set to 3.2, the temperature was raised to 90 ° C., and heat treatment was performed for 2 hours to obtain core particles.

  Thereafter, the water temperature is set to 60 ° C., 1N NaOH is added, the pH is set to 5.0, 50 g of the second wax dispersion WA7 is added, the water temperature is heated at 80 ° C. for 0.5 hours, and then 1N HCl is added. Then, the pH was set to 3.4 and heated at 95 ° C. for 1 hour to obtain wax-adhered particles.

  Further, the water temperature was set to 60 ° C., the pH was set to 3.4, 43 g of the second shell resin particle dispersion RH5 was added, and heat treatment was performed at a water temperature of 90 ° C. for 3 hours to obtain resin fused particles.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M8 having a volume average particle size of 6.1 μm and a coefficient of variation of 21.8.
(9) Preparation of Toner Base M9 To 2000 ml of a four-necked flask equipped with a thermometer, a cooling tube, a stirring rod, and a pH meter, 204 g of the first resin particle dispersion RL2 and 30 g of the colorant particle dispersion PM1 45 g of one wax dispersion WA1 was added, 350 ml of ion-exchanged water was added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Turrax T25) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 3.7.

Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 11.9, and then 280 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 20 ° C. to 90 ° C. at a rate of 1 ° C./min, followed by heat treatment for 3 hours to obtain aggregated particles. The obtained aggregated particle dispersion had a pH of 9.3.
Thereafter, 50 g of wax dispersion WA7 having a pH adjusted to 6.5 at a water temperature of 90 ° C. was added at a dropping rate of 1 g / min, followed by heat treatment at 95 ° C. for 2 hours. Wax-fused particles in which wax was fused were obtained. The resulting wax fused particle dispersion had a pH of 7.3.

  Thereafter, 43 g of the second resin particle dispersion RH4 having a pH adjusted to 6.0 with a water temperature of 90 ° C. was added at a dropping rate of 1 g / min. Heat treatment was performed to obtain particles in which the second resin particles were fused.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid dryer to obtain a toner base M9e having a volume average particle size of 4.4 μm and a coefficient of variation of 15.6.
(Table 8) shows the internal temperature (° C.), the pH of the liquid, and the volume average particle size (d50 (μm)) after the time has elapsed in the core particle generation step after mixing. For M9b, M9c, M9d, M9e, M9f, M9g, M9h, and M9i, M9a core particle dispersions produced up to 3h of M9a core particles were used.

  In addition, the pH of the wax particle dispersion to be dropped in the wax fusion process, the temperature in the tank (° C.), the volume average particle diameter (d50 (μm)), and the wax particle dispersion with respect to the time elapsed after completion of the wax particle dispersion droplets. The pH value of the liquid 2 hours after the completion of dropping is shown. “W: (numerical value)” represents the pH value after adjustment of the wax particle dispersion to be dropped. M9a to i have pH values after adjustment of the wax particle dispersion of 10.5, 9.5, 8.5, 7.5, 6.5, 5.5, 4.5, 3.5, 11 The pH value and volume average particle diameter (d50 (μm)) of the liquid at the time of completion of dropping at 2 h are shown.

  In addition, the pH of the second resin particle dispersion to be dropped in the second resin particle fusion step, the temperature in the tank (° C.) with respect to the time elapsed after the end of the second resin particle dispersion droplet, the volume average particle diameter ( d50 (μm)) and the pH value and volume average particle size (d50 (μm)) shape factor of the liquid after 2 hours from the end of the second resin particle-dispersed droplet. “R: (numerical value)” indicates the pH value after adjustment of the second resin particle dispersion to be dropped.

  By adjusting the pH value (W) from 8.5 to 10.5, d50 tends to increase.

When the pH value (W) is 3.5, when the wax particle dispersion is dropped, the wax particles do not adhere to the core particles at all, and only the wax particles are aggregated and the volume variation coefficient is 40 or more. And the dispersion remained cloudy. When the pH value (W) was 11, the generated particles were coarsened to a volume average particle size of 15 μm or more.
(10) Preparation of toner base M10 In a 4-ml flask equipped with a thermometer, a cooling tube, a stirring rod, and a pH meter, 204 g of the first resin particle dispersion RL2 and 30 g of the colorant particle dispersion PM1 65 g of one wax particle dispersion WA2 was added, 350 ml of ion-exchanged water was added, and the mixture was mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Turrax T50) to prepare a mixed particle dispersion. The pH of the obtained mixed dispersion was 2.4.

  Thereafter, 1N NaOH was added to the obtained mixed dispersion to adjust the pH to 9.7, and then 280 g of a 30% strength magnesium sulfate aqueous solution was added, followed by stirring for 10 minutes. Thereafter, the temperature was raised from 20 ° C. to 90 ° C. at a rate of 1 ° C./min, followed by heat treatment for 3 hours to obtain aggregated particles. The obtained aggregated particle dispersion had a pH of 7.

  Thereafter, 50 g of the second wax dispersion WA8 having a pH adjusted to 5 was added at a dropping rate of 10 g / min in a state where the water temperature was 90 ° C., and added. Heat treatment was performed for 5 hours to obtain wax fused particles in which the second wax was fused. The resulting wax fused particle dispersion had a pH of 6.8.

  Thereafter, 43 g of the second resin particle dispersion RH4 having a pH adjusted to 5.5 with a water temperature of 90 ° C. was added at a dropping rate of 10 g / min. To obtain particles in which the second resin particles were fused.

Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base M10d having a volume average particle size of 5.9 μm and a coefficient of variation of 21.9.
(Table 9) shows the internal temperature (° C.), the pH of the liquid, and the volume average particle diameter (d50 (μm)) after the time has elapsed in the core particle generation step after mixing. For M10b, M10c, M10d, M10e, M10f, and M10g, the M10a wax fused particle dispersion produced until the M10a wax fused particles were produced was used.

  In addition, the pH of the wax particle dispersion to be dropped in the wax fusion process, the temperature in the tank (° C.), the volume average particle diameter (d50 (μm)), and the wax particle dispersion with respect to the time elapsed after completion of the wax particle dispersion droplets. The pH value and volume average particle diameter (d50 (μm)) of the liquid 2 hours after the completion of dropping are shown. “W: (numerical value)” represents the pH value after adjustment of the wax particle dispersion to be dropped.

  In addition, the pH of the second resin particle dispersion to be dropped in the second resin particle fusion step, the temperature in the tank (° C.) with respect to the time elapsed after the end of the second resin particle dispersion droplet, the volume average particle diameter ( d50 (μm)) and the pH value and volume average particle size (d50 (μm)) shape factor of the liquid after 2 hours from the end of the second resin particle-dispersed droplet. “R: (numerical value)” indicates the pH value after adjustment of the second resin particle dispersion to be dropped.

By adjusting the pH value (R) from 6.5 to 8.5, d50 is slightly increased and the shape tends to shift to an indeterminate shape. When the pH value (R) is 3, when the second resin particle dispersion is added dropwise, the second resin particles do not adhere to the wax-fused particles at all, and only the second resin particles cause aggregation, resulting in a volume variation coefficient. The particle size distribution was significantly broader than 38, and the dispersion remained cloudy. When the pH value (R) was 9.5, the generated particles were coarsened to a volume average particle size of 15 μm or more.
(11) Preparation of toner base m11 A 2000 ml four-necked flask equipped with a thermometer, a cooling tube, a stirring rod, and a pH meter, 204 g of resin particle dispersion RL2, 30 g of colorant particle dispersion PM1, and wax particle dispersion 50 g of wa10 and 300 ml of ion-exchanged water were added, and mixed for 10 min using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion.

  1N NaOH was added to the obtained mixed particle dispersion to adjust the pH to 10.0, and then 270 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 min. Thereafter, the temperature was raised from 22 ° C. to 70 ° C. at a rate of 5 ° C./min, and then heated at 70 ° C. for 2 hours. Thereafter, the temperature was raised to 90 ° C. and treated for 5 hours to obtain aggregated particles. The obtained aggregated particle dispersion had a pH of 7.5. The volume average particle diameter was 10.8 μm, and the coefficient of variation was 22.1.

  Thereafter, the water temperature was set to 60 ° C., 43 g of the second shell resin particle dispersion RH4 was added, and 1N NaOH was added to adjust the pH to 6.0.

Then, the water temperature was heated at 80 ° C. for 1 h, and then 1N HCl was added to adjust the pH to 5.5. Thereafter, the mixture was further heated at 90 ° C. for 5 hours.
Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. Thereafter, the obtained toner base was dried at 40 ° C. for 6 hours by a fluid drier to obtain a toner base m10 having a volume average particle diameter of 14.8 μm and a coefficient of variation of 25.8.
(12) Preparation of toner base m12 A 2000 ml four-necked flask equipped with a thermometer, a cooling tube, a stirring rod, and a pH meter, 204 g of resin particle dispersion RL2, 30 g of colorant particle dispersion PM1, and wax particle dispersion 50 g of wa11 and 300 ml of ion-exchanged water were added, and mixed for 10 min using a homogenizer (manufactured by IKA: Ultra Tarrax T25) to prepare a mixed particle dispersion.

  1N NaOH was added to the obtained mixed particle dispersion to adjust the pH to 9.0, and then 270 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 min. Thereafter, the temperature was raised from 22 ° C. to 90 ° C. at a rate of 5 ° C./min, and then heat-treated at 90 ° C. for 6 hours to obtain aggregated particles. The resulting aggregated particle dispersion had a pH of 6.5. The volume average particle diameter was 15.8 μm, and the coefficient of variation was 31.8.

  Thereafter, the water temperature was set to 60 ° C., 43 g of the second shell resin particle dispersion RH4 was added, and 1N NaOH was added to adjust the pH to 4.8.

Then, the water temperature was heated at 90 ° C. for 1 h, and then 1N HCl was added to adjust the pH to 3.0. Thereafter, the mixture was further heated at 90 ° C. for 5 hours.
Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. The toner base thus obtained was dried at 40 ° C. for 6 hours with a fluid-type dryer to obtain toner base m11. A broad particle size distribution with a volume average particle size of 18.9 μm and a coefficient of variation of 34.8 was obtained.
(13) Preparation of toner base m13 In a 4-ml flask equipped with a thermometer, a cooling tube, a stirrer, and a pH meter, 204 g of resin particle dispersion RL2 and 30 g of 20 wt% colorant particle dispersion PM1 are added. 50% of wax particle dispersion wa12 having a% concentration and 300 ml of ion-exchanged water were added, and mixed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Turrax T50) to prepare a mixed particle dispersion.

  1N NaOH was added to the obtained mixed particle dispersion to adjust the pH to 9.2, and then 270 g of a 30% strength magnesium sulfate aqueous solution was added and stirred for 10 min. Thereafter, the temperature was raised from 22 ° C. to 85 ° C. at a rate of 5 ° C./min, and then heat-treated at 85 ° C. for 5 hours to obtain aggregated particles. The resulting aggregated particle dispersion had a pH of 6.5. The volume average particle diameter was 19.6 μm, and the coefficient of variation was 34.1.

  Thereafter, the water temperature was set to 60 ° C., 43 g of the second shell resin particle dispersion RH4 was added, and 1N NaOH was added to adjust the pH to 4.8.

Then, the water temperature was heated at 90 ° C. for 1 h, and then 1N HCl was added to adjust the pH to 3.0. Thereafter, the mixture was further heated at 90 ° C. for 5 hours.
Then, after cooling, the reaction product (toner base material) was filtered and washed with ion-exchanged water three times. The toner base thus obtained was dried at 40 ° C. for 6 hours with a fluid-type dryer to obtain toner base m12. A broad particle size distribution with a volume average particle size of 22.7 μm and a coefficient of variation of 38.1 was obtained.
(14) Preparation of toner base m14 The toner base m14 was produced in the same manner as the toner M1, except that the wax WA6 was not added.
(15) Preparation of toner base m15 The toner base m15 was produced in the same manner as the toner M2, except that the wax WA7 was not added.
(16) Preparation of toner base m16 The toner base m16 was produced in the same manner as the toner M3 except that the wax WA8 was not added.
(17) Preparation of toner base m17 The toner base m17 was produced in the same manner as the toner M4, except that the wax WA4 was not added.
(18) Preparation of toner base m18 The toner base m18 was produced in the same manner as the toner M5 except that the wax WA5 was not added.
Table 10 shows the external additives used in this example. The amount of charge was measured by the blow-off method of frictional charging with an uncoated ferrite carrier. In an environment of 25 ° C. and 45 RH%, 50 g of carrier and 0.1 g of silica or the like are mixed in a 100 ml polyethylene container, stirred for 5 minutes and 30 minutes at a speed of 100 min ⁻¹ by longitudinal rotation, and 0.3 g is collected. Then, nitrogen gas was blown for 1 minute with 1.96 × 10 ⁴ (Pa).

For negative chargeability, the 5-minute value is preferably −100 to −800 μC / g, and the 30-minute value is preferably −50 to −600 μC / g. Highly charged silica can function with a small amount of addition.
Table 11 shows the toner material composition used in this example. Other black toner, cyan toner, and yellow toner used PB1, PC1, and PY1 as pigments, and other compositions were the same as the magenta toner composition.

The external additive indicates a blending amount (parts by weight) with respect to 100 parts by weight of the toner base. The external addition process was performed in FM20B with a stirring blade Z0S0 type, a rotational speed of 2000 min ⁻¹ , a processing time of 5 min, and an input amount of 1 kg.

  FIG. 1 is a cross-sectional view showing a configuration of an image forming apparatus for forming a full-color image used in this embodiment. In FIG. 1, the outer casing of the color electrophotographic printer is omitted.

  The transfer belt unit 17 includes a transfer belt 12, a first color (yellow) transfer roller 10Y made of an elastic body, a second color (magenta) transfer roller 10M, a third color (cyan) transfer roller 10C, and a fourth color (black). Transfer roller 10K, drive roller 11 made of aluminum roller, second transfer roller 14 made of elastic body, second transfer driven roller 13, belt cleaner blade 16 for cleaning the toner image remaining on the transfer belt 12, and opposed to the cleaner blade A roller 15 is provided at a position to be used.

  At this time, the distance from the first color (Y) transfer position to the second color (M) transfer position is 70 mm (second color (M) transfer position to third color (C) transfer position, third color (C). The fourth color (K) transfer position is the same distance from the transfer position), and the peripheral speed of the photoconductor is 125 mm / s.

The transfer belt 12 is used by kneading a conductive filler in an insulating polycarbonate resin and forming a film with an extruder. In the present example, a film obtained by adding 5 parts by weight of conductive carbon (for example, ketjen black) to 95 parts by weight of polycarbonate resin (for example, Iupilon Z300, manufactured by Mitsubishi Gas Chemical) as the insulating resin was used. Further, the surface is coated with a fluororesin, the thickness is about 100 μm, the volume resistance is 10 ⁷ to 10 ¹² Ω · cm, and the surface resistance is 10 ⁷ to 10 ¹² Ω / □. This is also for improving dot reproducibility. This is for the purpose of effectively preventing loosening and charge accumulation due to long-term use of the transfer belt 12, and the reason that the surface is coated with fluororesin is that the toner filming on the surface of the transfer belt after long-term use. This is so that it can be effectively prevented. If the volume resistance is less than 10 ⁷ Ω · cm, retransfer is likely to occur, and if it is greater than 10 ¹² Ω · cm, the transfer efficiency deteriorates.

The first transfer roller is a carbon conductive urethane foam roller having an outer diameter of 8 mm, and the resistance value is 10 ² to 10 ⁶ Ω. During the first transfer operation, the first transfer roller 10 is pressed against the photoreceptor 1 with a pressing force of 1.0 to 9.8 (N) via the transfer belt 12, and the toner on the photoreceptor is transferred onto the belt. Is done. If the resistance value is smaller than 10 ² Ω, retransfer is likely to occur. Larger transfer defects are more likely to occur than 10 ⁶ Ω. If it is less than 1.0 (N), transfer defects occur, and if it is greater than 9.8 (N), transfer character omission occurs.

The second transfer roller 14 is a carbon conductive foamed urethane roller having an outer diameter of 10 mm, and the resistance value is 10 ² to 10 ⁶ Ω. The second transfer roller 14 is pressed against the transfer roller 13 via the transfer belt 12 and a transfer medium 19 such as paper or OHP. The transfer roller 13 is configured to be driven to rotate by the transfer belt 12. In the second transfer, the second transfer roller 14 and the counter transfer roller 13 are pressed against each other with a pressing force of 5.0 to 21.8 (N), and the toner is transferred from the transfer belt onto the recording material 19 such as paper. The If the resistance value is smaller than 10 ² Ω, retransfer is likely to occur. Larger transfer defects are more likely to occur than 10 ⁶ Ω. If it is smaller than 5.0 (N), transfer failure occurs. If it is larger than 21.8 (N), the load increases and jitter tends to occur.

  Four sets of image forming units 18Y, 18M, 18C, and 18K for each color of yellow (Y), magenta (M), cyan (C), and black (B) are arranged in series as shown in the figure.

  Each of the image forming units 18Y, 18M, 18C, and 18K is composed of the same constituent members except for the developer contained therein, so that the Y image forming unit 18Y will be described to simplify the description, and the units for other colors The description of is omitted.

  The image forming unit is configured as follows. 1 is a photosensitive member, 3 is a pixel laser signal light, 4 is a developing roller having an outer diameter of 10 mm made of aluminum having a magnet having a magnetic force of 1200 gauss, and is opposed to the photosensitive member with a gap of 0.3 mm. Rotate in the direction of. 6 is a stirring roller that stirs the toner and carrier in the developing device and supplies them to the developing roller. The composition ratio of the carrier and the toner is read by a magnetic permeability sensor (not shown) and is supplied from a toner hopper (not shown) in a timely manner. A metal magnetic blade 5 regulates the magnetic brush layer of the developer on the developing roller. The developer amount is 150 g. The gap was 0.4 mm. Although the power source is omitted, a direct current of −500 V and an alternating voltage of 1.5 kV (pp) and a frequency of 6 kHz are applied to the developing roller 4. The peripheral speed ratio between the photoreceptor and the developing roller was 1: 1.6. The mixing ratio of toner and carrier was 93: 7, and the developer amount in the developing unit was 150 g.

  A charging roller 2 having an outer diameter of 10 mm made of epichlorohydrin rubber is applied with a DC bias of -1.2 kV. The surface of the photoreceptor 1 is charged to −600V. 8 is a cleaner, 9 is a waste toner box, and 7 is a developer.

The paper is transported from below the transfer unit 17 so that the paper 19 is fed by a paper feed roller (not shown) to the nip portion where the transfer belt 12 and the second transfer roller 14 are pressed. A conveyance path is formed.
The toner on the transfer belt 12 is transferred to the paper 19 by +1000 V applied to the second transfer roller 14, and includes a fixing roller 201, a pressure roller 202, a fixing belt 203, a heating medium roller 204, and an induction heater unit 205. It is conveyed to the fixing unit and fixed there.

  FIG. 2 shows the fixing process. A belt 203 is placed between the fixing roller 201 and the heat roller 204. A predetermined load is applied between the fixing roller 201 and the pressure roller 202, and a nip is formed between the belt 203 and the pressure roller 202. An induction heater unit 205 including a ferrite core 206 and a coil 207 is provided on the outer peripheral surface of the heat roller 204, and a temperature sensor 208 is provided on the outer surface.

  The belt has a structure in which 30 μm of Ni is used as a base, silicone rubber is 150 μm thereon, and further, PFA tube is 30 μm.

  The pressure roller 202 is pressed against the fixing roller 201 by a pressure spring 209. The recording material 19 having the toner 210 moves along the guide plate 211.

  A fixing roller 201 as a fixing member is a silicone rubber having a rubber hardness (JIS-A) of 20 degrees according to JIS standard on the surface of an aluminum hollow roller metal core 213 having a length of 250 mm, an outer diameter of 14 mm, and a thickness of 1 mm. An elastic layer 214 having a thickness of 3 mm is provided. A silicone rubber layer 215 is formed thereon with a thickness of 3 mm and has an outer diameter of about 20 mm. It receives a driving force from a driving motor (not shown) and rotates at 125 mm / s.

  The heat roller 204 is a hollow pipe having a thickness of 1 mm and an outer diameter of 20 mm. The surface temperature of the fixing belt was controlled to 170 ° using a thermistor.

  The pressure roller 202 as a pressure member has a length of 250 mm and an outer diameter of 20 mm. This is provided with a 2 mm thick elastic layer 217 made of silicone rubber having a rubber hardness (JIS-A) of 55 degrees according to JIS standards on the surface of a hollow roller metal core 216 made of aluminum having an outer diameter of 16 mm and a thickness of 1 mm. . The pressure roller 202 is rotatably installed, and a nip width of 5.0 mm is formed between the pressure roller 202 and the fixing roller 201 by a spring-loaded spring 209 on one side 147N.

  The operation will be described below. In the full color mode, all of the first transfer rollers 10 of Y, M, C, and K are pushed up and press the photoreceptor 1 of the image forming unit via the transfer belt 12. At this time, a DC bias of +800 V is applied to the first transfer roller. An image signal is sent from the laser beam 3 and is incident on the photoreceptor 1 whose surface is charged by the charging roller 2 to form an electrostatic latent image. The toner on the developing roller 4 that rotates in contact with the photoreceptor 1 visualizes the electrostatic latent image formed on the photoreceptor 1.

  At this time, the image forming speed of the image forming unit 18Y (125 mm / s equal to the peripheral speed of the photoconductor) and the moving speed of the transfer belt 12 are 0.5 to 1.5% slower than the transfer belt speed. Is set to

  In the image forming process, the Y signal light 3Y is input to the image forming unit 18Y, and image formation with Y toner is performed. Simultaneously with the image formation, the first transfer roller 10Y causes the Y toner image to be transferred from the photoreceptor 1Y to the transfer belt 12. At this time, a DC voltage of +800 V was applied to the first transfer roller 10Y.

  With a time lag between the first color (Y) first transfer and the second color (M) first transfer, M signal light 3M is input to the image forming unit 18M, and image formation with M toner is performed. Simultaneously with the image formation, the M toner image is transferred from the photosensitive member 1M to the transfer belt 12 by the action of the first transfer roller 10M. At this time, the first color (Y) toner is formed and the M toner is transferred. Similarly, image formation with C (cyan) and K (black) toners is performed, and a YMCK toner image is formed on the transfer belt 12 by the action of the first transfer rollers 10C and 10B simultaneously with the image formation. This is a so-called tandem method.

  On the transfer belt 12, toner images of four colors are positioned and overlapped to form a color image. After the transfer of the final B toner image, the four color toner images are collectively transferred to the paper 19 fed from a paper feed cassette (not shown) at the same time by the action of the second transfer roller 14. At this time, the transfer roller 13 was grounded, and a DC voltage of +1 kV was applied to the second transfer roller 14. The toner image transferred to the paper was fixed by a pair of fixing rollers 201 and 202. The paper was then discharged out of the apparatus through a pair of discharge rollers (not shown). The residual transfer toner remaining on the intermediate transfer belt 12 was cleaned by the action of the cleaning blade 16 to prepare for the next image formation.

  Table 12 shows the results of image output using the electrophotographic apparatus shown in FIG. Filming on the photoconductor, changes in image density before and after the durability test, the degree of toner adhesion to the non-image area, fogging, uniformity when taking an image on the entire surface, magenta, cyan, yellow toner In the full-color image in which three colors are superimposed, scattering at the time of transfer in the character portion or a so-called hollow state where a part of the full-color image remains on the photosensitive member without being transferred, after yellow or magenta toner is transferred, the next magenta, cyan or This shows a reverse transfer state in which the yellow or magenta toner already transferred at the time of transfer of the black toner is attached to the photosensitive member and returned.

The charge amount is measured by the blow-off method of frictional charging with the ferrite carrier. In an environment of 25 ° C. and 45% RH, 0.3 g of a sample for durability evaluation was collected and blown with nitrogen gas 1.96 × 10 ⁴ (Pa) for 1 minute.

  When the images were taken out with DM11 to DM20, the solid black image was uniform with no horizontal line disturbance, toner scattering, character dropouts, etc., and an image line of 16 lines / mm was reproduced. An image was obtained, and a high density image having an image density of 1.3 or more was obtained. In addition, the ground cover of the non-image area did not occur. Further, even in the long-term durability test of 1 million A4 sheets, both the fluidity and the image density showed a stable characteristic with little change. In addition, the uniformity when the entire solid image was taken at the time of development was also good. There is no development memory. Even during continuous use, no abnormal image of the vertical muscles occurred. There is almost no spent toner component on the carrier. There is little change in carrier resistance and decrease in charge amount, and fog does not occur. The charge rising property at the time of rapid toner replenishment was also good, and there was no phenomenon that fogging increased in a high humidity environment. Also, when used for a long time, a high saturation charge amount was obtained and could be maintained for a long time. Fluctuations in charge amount under low temperature and low humidity hardly occur. Also, in the transfer, the void is at a level that causes no problem in practical use, and the transfer efficiency is about 95%. Further, the filming of the toner on the photosensitive member and the transfer belt was at a level where there was no practical problem. There was no defective cleaning of the transfer belt. In addition, toner disturbance and toner skip at the time of fixing hardly occur. Also, in the full-color image in which the three colors overlap, no transfer failure occurred, and no paper wrapping around the fixing belt occurred during fixing.

  For cm1, cm2, cm3, cm4, and cm5, toner and developer have a process speed of 100 mm / s, and when the distance between the photoconductors is 70 mm, characters are scattered during transfer, transfer characters are missing, and reverse transferability is slightly worse. The solid image uniformity on the entire surface was good, but the image uniformity on the entire surface deteriorated when the process speed was increased to 125 mm / s or when the distance between the photoconductors was 60 mm. In addition, at cm1 and cm4, an increase in charge occurred, and the image density decreased. The fog was noticeable at cm2, cm3, and cm5. In addition, when the entire surface was continuously taken with two-component development and the toner was replenished rapidly, charge reduction occurred and fogging increased. The phenomenon worsened particularly in a high humidity environment.

  Table 13 shows the OHP transmittance, the minimum fixing temperature (° C.), the high temperature offset occurrence temperature, the storage stability, and the paper wrapping property around the fixing belt in fixing.

In the fixing device shown in FIG. 2 using a solid image with an adhesion amount of 1.2 mg / cm ^{2 at} a process speed of 125 mm / s and a belt not coated with oil, OHP transmittance (fixing temperature 160 ° C.), minimum fixing temperature (toner The temperature at which the cold offset that does not completely melt and remains on the fixing belt does not occur), and the offset property at a high temperature was evaluated. The OHP transmittance was measured with a spectrophotometer U-3200 (Hitachi, Ltd.) for the transmittance of 700 nm light. Storage stability shows the result after standing at 60 ° C. for 5 hours.

  With the TM1 to TM10 toners, no OHP jam occurred at the fixing nip portion. In the full-solid image of plain paper, no offset occurred at 200,000 sheets. Even if the oil is not applied with a silicone or fluorine-based fixing belt, no belt surface deterioration phenomenon is observed. The OHP translucency was 80% or more, and the non-offset temperature range was obtained in a wide range in the fixing belt not using oil. In addition, almost no aggregation was observed in the storage stability at 60 ° C. for 5 hours (◯ level).

  tm11, 12 and 13 toners tend to have a high minimum fixing temperature, tm14, 15 and 16 toners tend to have a low high temperature offset medium, and tm17 and 18 toners tend to have a high minimum fixing temperature. It became a thing.

  The present invention is useful not only for an electrophotographic system using a photoconductor but also for a system in which toner is directly attached to paper for printing.

Sectional drawing which shows the structure of the image forming apparatus used in the Example of this invention Sectional drawing which shows the structure of the fixing unit used in the Example of this invention Schematic of the stirring and dispersing apparatus used in the examples of the present invention View from above of the stirring and dispersing device used in the examples of the present invention Schematic of the stirring and dispersing apparatus used in the examples of the present invention View from above of the stirring and dispersing device used in the examples of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Photoconductor 2 Charging roller 3 Laser signal light 4 Developing roller 5 Blade 10 1st transfer roller 12 Transfer belt 14 2nd transfer roller 13 Drive tension roller 17 Transfer belt unit 18B, 18C, 18M, 18Y Image forming unit 18 Image forming unit Group 201 Fixing roller 202 Pressure roller 203 Fixing belt 205 Induction heater section 206 Ferrite core 207 Coil 801 Outer tank 802 Dam plate 803 Rotating body 806 Shaft 807 Cooling water outlet 808 Cooling water inlet 850 Raw material inlet 852 Fixed body 853 Rotation Body 854 Shaft 856 Raw material discharge

Claims (52)

In the aqueous medium, at least the first resin particle dispersion in which the first resin particles are dispersed, the colorant particle dispersion in which the colorant particles are dispersed, and the first wax particles in which the first wax is dispersed. The dispersion is mixed and heat treated to form agglomerated particles that are at least partially melted,
A second wax particle dispersion in which a second wax is dispersed is added to the dispersion in which the aggregated particles are dispersed, and heat treatment is performed to fuse the wax to the surface of the aggregated particles. A toner obtained by adding a dispersed second resin particle dispersion, heat-treating, and fusing the second resin particles to the surface of the wax fused layer of the aggregated particles,
The endothermic peak temperature (referred to as melting point Tmw1 (° C.)) of the first wax by the DSC method is lower than the endothermic peak temperature (referred to as melting point Tmw2 (° C.)) of the second wax, and A toner having a temperature difference between Tmw1 and Tmw2 of 5 ° C. or more and 50 ° C. or less. The pH value of the second wax particle dispersion in which the second wax is dispersed is added in the range of HS + 2 to HS-5, where HS is the pH value of the aggregated particle dispersion in which the molten aggregated particles are dispersed. The toner described. The toner according to claim 1, wherein the second wax particle dispersion in which the second wax is dispersed is added so that the pH is in the range of 3.5 to 10.5. When the pH value of the wax fused particle dispersion in which the wax fused particles in which the second wax is fused on the surface of the aggregated particles is HSw, the second resin particle dispersion in which the second resin particles are dispersed. The toner according to claim 1, wherein the pH value of the liquid is added within a range of HSw + 2 to HSw−5. The toner according to any one of claims 1 to 4, wherein the second resin particle dispersion in which the second resin particles are dispersed is added in a pH range of 3.5 to 10.5. The toner according to claim 1, wherein a main component of the surfactant used in the first wax particle dispersion in which the first wax is dispersed is a nonionic surfactant. The toner according to claim 1, wherein a main component of the surfactant used in the second wax particle dispersion in which the second wax is dispersed is a nonionic surfactant. The main component of the surfactant used in the first wax dispersion is only a nonionic surfactant,
The toner according to claim 1, wherein the surfactant used in the first resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant. The main component of the surfactant used in the first resin dispersion is a nonionic surfactant, and the main component of the surfactant used in the colorant dispersion is a nonionic surfactant. Or the toner described. The main component of the surfactant used in the first wax dispersion is only a nonionic surfactant,
The main component of the surfactant used in the colorant dispersion is only a nonionic surfactant,
The surfactant used in the first resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio thereof is 60% with respect to the whole surfactant. The toner according to any one of claims 1 to 9, wherein the toner has a constitution having at least%. The surfactant used in the second wax dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio of the surfactant is 60 with respect to the whole surfactant. % Or more,
The surfactant used in the second resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio of the surfactant is 60 with respect to the whole surfactant. The toner according to any one of claims 1 to 9, wherein the toner has a composition having at least%. The toner according to claim 1, wherein the first wax contains an ester wax having an iodine value of 25 or less and a saponification value of 30 to 300. In the molecular weight distribution in gel permeation chromatography (GPC), the first wax has a number average molecular weight of 100 to 5000, a weight average molecular weight of 200 to 10,000, and a ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average). The molecular weight is 1.01 to 8, the ratio of the Z average molecular weight to the number average molecular weight (Z average molecular weight / number average molecular weight) is 1.02 to 10, and the molecular weight is 5 × 10 ² to 1 × 10 ⁴ . The toner according to claim 1, comprising an ester wax having a maximum molecular weight peak and a loss on heating at 220 ° C. of 8% by weight or less. The toner according to any one of claims 1 to 11, wherein the first wax comprises one or more waxes selected from the group consisting of a derivative of hydroxystearic acid, a glycerin fatty acid ester, a glycol fatty acid ester, and a sorbitan fatty acid ester. 12. The first wax according to any one of claims 1 to 11, wherein the wax comprises an aliphatic amide wax having 4 to 30 carbon atoms or a saturated or divalent unsaturated alkylene bis fatty acid amide wax. Toner. The toner according to claim 1, wherein the second wax contains at least an aliphatic hydrocarbon wax. The toner according to claim 1, wherein the second wax contains a wax obtained by a reaction with at least a long-chain alkyl alcohol, an unsaturated polyvalent carboxylic acid or an anhydride thereof, and a synthetic hydrocarbon wax. The toner has a volume average particle diameter of 3 to 7 μm, the content of toner base particles having a particle diameter of 2.52 to 4 μm in the number distribution is 10 to 75% by number, and has a particle diameter of 4 to 6.06 μm in the volume distribution. Toner base particles are 25 to 75% by volume, and toner base particles having a particle size of 8 μm or more in the volume distribution are contained at 5% by volume or less,
When the volume% of toner base particles having a particle diameter of 4 to 6.06 μm in the volume distribution is V46, and the number% of toner base particles having a particle diameter of 4 to 6.06 μm in the number distribution is P46, The toner according to claim 1, wherein P46 / V46 is in the range of 0.5 to 1.5. The inorganic fine powder having an average particle diameter of 6 nm to 20 nm is 0.5 to 2.5 parts by weight based on 100 parts by weight of the toner base, and the inorganic fine powder having an average particle diameter of 20 nm to 200 nm is based on 100 parts by weight of the toner base. The toner according to any one of claims 1 to 11, wherein 0.5 to 3.5 parts by weight of an external addition treatment is performed. An inorganic fine powder having an average particle size of 6 nm to 20 nm and an ignition loss of 1.5 to 25 wt% is 0.5 to 2.5 parts by weight with respect to 100 parts by weight of the toner base, an average particle size of 20 nm to 200 nm, strong The toner according to any one of claims 1 to 11, wherein 0.5 to 3.5 parts by weight of an inorganic fine powder having a heat loss of 0.5 to 23 wt% is further added to 100 parts by weight of the toner base. In an aqueous medium, at least a first resin particle dispersion in which the first resin particles are dispersed, a colorant particle dispersion in which the colorant particles are dispersed, and a wax particle dispersion in which the first wax is dispersed. Mixing and heat-treating to form agglomerated particles at least partially melted,
A wax particle dispersion in which a second wax is dispersed is added to the dispersion in which the aggregated particles are dispersed, and heat treatment is performed to form wax fused particles that fuse the second wax to the surface of the aggregated particles. Process,
A second resin particle dispersion liquid in which a second resin is dispersed is added to the dispersion liquid in which the second wax fusion particles are dispersed, and heat treatment is performed, and the second fusion resin particles are applied to the surface of the wax fusion particles. A method for producing a toner comprising a step of fusing resin particles,
The endothermic peak temperature (melting point Tmw1 (° C.)) of the first wax by the DSC method is lower than the endothermic peak temperature (melting point Tmw2 (° C.)) of the second wax by the DSC method, and Tmw1 and Tmw2 A method for producing a toner, wherein the temperature difference is 5 ° C. or more and 50 ° C. or less. In the step of forming the second wax fused particles, when the pH value of the aggregated particle dispersion in which the aggregated particles are dispersed is HS, the pH of the second wax particle dispersion in which the second wax is dispersed. The method for producing a toner according to claim 21, comprising a step of adding as a range of HS + 2 to HS-5. 23. The method for producing toner according to claim 22, wherein the pH of the second wax particle dispersion in which the second wax is dispersed is in the range of 3.5 to 10.5. In the step of forming the resin fused particles, when the pH value of the second wax fused particle dispersion in which the second wax fused particles are dispersed is HSw, the second resin particles are dispersed. The method for producing a toner according to claim 21, further comprising a step of adding the pH value of the resin particle dispersion in a range of HSw + 2 to HSw−5. 25. The method for producing toner according to claim 24, wherein the pH of the second resin particle dispersion is in the range of 3.5 to 10.5. Forming the second wax-fused particles,
The toner production according to claim 21, further comprising the step of adjusting the pH of the dispersion in which the aggregated particles are dispersed to a range of 5.2 to 8.8 and adding the wax particle dispersion in which the second wax is dispersed. Method. Forming the second wax-fused particles,
Adjusting the pH of the dispersion in which the aggregated particles are dispersed to a range of 5.2 to 8.8, and then adding the wax particle dispersion in which the second wax is dispersed;
Then adjusting the pH to a range of 3.2 to 6.8;
The method for producing a toner according to claim 21, comprising a heat treatment step. Forming the resin-fused particles,
The pH of the dispersion in which the wax fusion particles are dispersed is adjusted to the range of 3.2 to 6.8, and then the second resin particle dispersion in which the second resin is dispersed is added, followed by heat treatment. The method for producing a toner according to claim 21, wherein the toner is formed. The step of forming aggregated particles
Mixing at least a first resin particle dispersion in which a first resin is dispersed, a colorant particle dispersion in which colorant particles are dispersed, and a wax particle dispersion in which a first wax is dispersed;
Adjusting the pH of the mixture to a range of 9.5 to 12.2.
The method for producing a toner according to any one of claims 21 to 28, further comprising a step of adding a water-soluble inorganic salt and heat-treating it. The step of forming aggregated particles
Mixing at least a first resin particle dispersion in which a first resin is dispersed, a colorant particle dispersion in which colorant particles are dispersed, and a wax particle dispersion in which a first wax is dispersed;
Adjusting the pH of the mixture to a range of 9.5 to 12.2.
Adding a water-soluble inorganic salt and heat-treating;
Again adjusting the pH of the mixture to a range of 2.2 to 6.8;
30. The method for producing a toner according to claim 21, further comprising a heat treatment step. 31. The method for producing a toner according to claim 21, wherein the main component of the surfactant used in the first wax particle dispersion in which the first wax is dispersed is a nonionic surfactant. 31. The method for producing a toner according to claim 21, wherein the main component of the surfactant used in the second wax particle dispersion in which the second wax is dispersed is a nonionic surfactant. The main component of the surfactant used in the first wax dispersion is only a nonionic surfactant,
31. The method for producing a toner according to claim 21, wherein the surfactant used in the first resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant. The main component of the surfactant used in the first resin dispersion is a nonionic surfactant, and the main component of the surfactant used in the colorant dispersion is a nonionic surfactant. A method for producing the toner according to any one of the above. The main component of the surfactant used in the first wax dispersion is only a nonionic surfactant,
The main component of the surfactant used in the colorant dispersion is only a nonionic surfactant,
The surfactant used in the first resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio thereof is 60% with respect to the whole surfactant. 31. The method for producing a toner according to any one of 21 to 30, wherein the toner has a constitution of at least%. The surfactant used in the second wax dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio of the surfactant is 60 with respect to the whole surfactant. % Or more,
The surfactant used in the second resin dispersion is a mixture of a nonionic surfactant and an ionic surfactant, and the mixing ratio of the surfactant is 60 with respect to the whole surfactant. 31. The method for producing a toner according to any one of 21 to 30, wherein the toner has a constitution of at least%. 37. The method for producing a toner according to claim 21, wherein the first wax contains an ester wax having an iodine value of 25 or less and a saponification value of 30 to 300. In the molecular weight distribution in gel permeation chromatography (GPC), the wax has a number average molecular weight of 100 to 5000, a weight average molecular weight of 200 to 10,000, and a ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight). Is 1.01 to 8, the ratio of the Z average molecular weight to the number average molecular weight (Z average molecular weight / number average molecular weight) is 1.02 to 10, and the molecular weight is 5 × 10 ² to 1 × 10 ^4. 37. The method for producing a toner according to any one of claims 21 to 36, comprising an ester wax having a peak and having a heat loss at 220 ° C. of 8% by weight or less. 37. The toner according to claim 21, wherein the first wax comprises one or more waxes selected from the group of hydroxystearic acid derivatives, glycerin fatty acid esters, glycol fatty acid esters, and sorbitan fatty acid esters. Production method. The first wax includes an aliphatic amide wax having 4 to 30 carbon atoms or a saturated or divalent unsaturated alkylene bis fatty acid amide wax. Toner production method. 37. The method for producing a toner according to claim 21, wherein the second wax contains at least an aliphatic hydrocarbon wax. The method for producing a toner according to any one of claims 21 to 36, wherein the second wax contains at least a wax obtained by a reaction with a long-chain alkyl alcohol, an unsaturated polyvalent carboxylic acid or an anhydride thereof, and a synthetic hydrocarbon wax. . The toner has a volume average particle diameter of 3 to 7 μm, the content of toner base particles having a particle diameter of 2.52 to 4 μm in the number distribution is 10 to 75% by number, and has a particle diameter of 4 to 6.06 μm in the volume distribution. Toner base particles are 25 to 75% by volume, and toner base particles having a particle size of 8 μm or more in the volume distribution are contained at 5% by volume or less,
When the volume% of toner base particles having a particle diameter of 4 to 6.06 μm in the volume distribution is V46, and the number% of toner base particles having a particle diameter of 4 to 6.06 μm in the number distribution is P46, 37. The method for producing a toner according to claim 21, wherein P46 / V46 is in the range of 0.5 to 1.5. An inorganic fine powder having an average particle diameter in the range of 6 nm to 200 nm is added to the toner base according to claim 1 or the manufactured toner base according to any one of claims 21 to 43 with respect to 100 parts by weight of the toner base. A two-component developer comprising: a toner added in a range of ˜6 parts by weight; and a carrier containing at least a magnetic particle whose surface is coated with a fluorine-modified silicone resin containing an aminosilane coupling agent. 30. The two-component developer according to claim 29, wherein the carrier coating resin contains 5 to 40 parts by weight of an aminosilane coupling agent in 100 parts by weight of the coating resin. 30. The two-component developer according to claim 29, wherein the fluorine-modified silicone resin is a crosslinkable fluorine-modified silicone resin obtained from a reaction between a perfluoroalkyl group-containing organosilicon compound and polyorganosiloxane. Crosslinkable fluorine-modified silicone obtained by a reaction in which the fluorine-modified silicone resin is a reaction in which the organosilicon compound containing a perfluoroalkyl group is 3 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the polyorganosiloxane. 30. The two-component developer according to claim 29, wherein the two-component developer is a resin. The organosilicon compound containing a perfluoroalkyl group is CF ₃ CH ₂ CH ₂ Si (OCH ₃ ) ₃ , C ₄ F ₉ CH ₂ CH ₂ Si (CH ₃ ) (OCH ₃ ) ₂ , C ₈ F ₁₇ CH ₂ CH ₂ Si (OCH ₃ ) ₃ , C ₈ F ₁₇ CH ₂ CH ₂ Si (OC ₂ H ₅ ) ₃ , and (CF ₃ ) ₂ CF (CF ₂ ) ₈ CH ₂ CH ₂ Si (OCH ₃ ) ₃ 40. The two-component developer according to claim 39, wherein the two-component developer is at least one. 40. The two-component developer according to claim 39, wherein the polyorganosiloxane is at least one selected from the following (Chemical Formula 1) and (Chemical Formula 2).

At least a magnetic field generating means, a heating member having a rotating action having at least a heat generating layer and a release layer that generate heat by electromagnetic induction, and a pressing member having a rotating action that forms a fixed nip with the heating member. A toner according to any one of claims 1 to 20, a toner produced by the method according to any of claims 21 to 43, or a toner according to any one of claims 44 to 49, comprising a heating and pressing means. An image forming apparatus comprising: a fixing process in which a transfer medium on which toner in the two-component developer described in any one is transferred is fixed. And a plurality of toner image forming stations including at least an image carrier, a charging unit for forming an electrostatic latent image on the image carrier and a toner carrier, and an electrostatic latent image formed on the image carrier. An electrostatic latent image developed with the toner according to any one of claims 1 to 20, the toner produced by the method according to any one of claims 21 to 43, or the two-component developer according to any one of claims 44 to 49. A primary transfer process of transferring the toner image that has been visualized to the image bearing member by bringing the endless transfer member into contact with the image bearing member and sequentially transferring the toner image onto the transfer member is performed sequentially. A transfer system configured to execute a secondary transfer process in which a toner image is formed and then a multilayer toner image formed on the transfer body is collectively transferred to a transfer medium, and the transfer process includes: First primary The distance from the copying position to the second primary transfer position, the distance from the second primary transfer position to the third primary transfer position, or the distance from the third primary transfer position to the fourth primary transfer position is d1. An image forming apparatus having a configuration satisfying a condition of d1 / v ≦ 0.65 (sec) where (mm) and the peripheral speed of the photosensitive member is v (mm / s). And a plurality of toner image forming stations including at least an image carrier, a charging unit for forming an electrostatic latent image on the image carrier and a toner carrier, and an electrostatic latent image formed on the image carrier. An electrostatic latent image developed with the toner according to any one of claims 1 to 20, the toner produced by the method according to any one of claims 21 to 43, or the two-component developer according to any one of claims 44 to 49. A transfer system configured to execute a transfer process in which the toner images that have been visualized are sequentially transferred to a transfer medium, and the transfer process starts from a first transfer position and is transferred to a second transfer position. The distance to the position, the distance from the second transfer position to the third transfer position, or the distance from the third transfer position to the fourth transfer position is d1 (mm), and the peripheral speed of the photosensitive member is v ( mm / s), d Image forming apparatus, characterized in that the arrangement which satisfies the condition of /v≦0.65(sec).

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