JP5836766B2 - Yellow toner - Google Patents

Description

  The present invention relates to a toner used in an image forming method such as an electrophotographic method, an electrostatic recording method, a magnetic recording method, and a toner jet method.

  In recent years, color images have been widely used, and demands for higher image quality of color images have increased. When forming an image, in a digital full-color copying machine or printer, a color image original is color-separated with B (blue), G (green), and R (red) color filters, and then 20 μm to 70 μm corresponding to the original image. A method of developing a latent image having a dot diameter of Y (yellow), M (magenta), C (cyan), and Bk (black) and forming an image on a recording material is generally used. is there. Therefore, the performance of the colorant in each color developer has a great influence on the image quality.

  In the paint field, yellow colorants have a high hiding power (the ability to output images with no image unevenness by firmly covering the recording material with toner) in order to give human sensitivity the same impression as other colors. In addition, a high coloring power is required, and for this reason, a colorant having a large primary particle diameter has been often used.

  On the other hand, in the toner field, requirements for colorants added to the toner include not only coloring power and hiding power but also good transparency. For this reason, a colorant having a large primary particle size that is preferably used in the paint field is difficult to satisfy these requirements at the same time, and various studies have been made so far.

  Transparency can be improved by using a colorant having a small primary particle size, but adverse effects such as aggregation of the colorant in the toner particles tend to occur. On the other hand, it has been proposed that by selecting a suitable binder resin, the dispersibility of the colorant in the toner particles can be improved and the above problems can be solved. Specifically, C. which is difficult to disperse by using as a main component a polyester resin having a defined acid value as a binder resin. I. Also in Pigment Yellow 155, good dispersibility can be achieved and transparency can be improved (see Patent Document 1). However, the coloring power and the saturation of the secondary colors red and green are not sufficient, and there is room for improvement. Further, since it does not contain a wax component, it is difficult to adapt to an image forming method using an oilless fixing method.

  On the other hand, C.I. I. Pigment Yellow 155 and C.I. I. There is disclosed a toner in which Solvent Yellow 162 is contained in a specific ratio to improve the charging characteristics, color tone, transparency, and coloring power in a well-balanced manner (see Patent Document 2). This is because C.I. I. Solvent Yellow 162 not only improves the coloring power but also C.I. I. It has been found that there is an effect of improving the dispersibility of Pigment Yellow 155 and has been utilized. Accordingly, it is possible to provide a toner capable of improving coloring power and synergistically improving transparency. However, on the other hand, C.I. I. Solvent Yellow 162 tends to color and contaminate an image forming member such as a developing device that comes into contact with toner at the time of image formation, and may affect charging characteristics. Further, when the toner is produced in an aqueous medium, C.I. I. Since Solvent Yellow 162 is also present in the vicinity of the surface layer of the toner particles, storage stability and low-temperature fixability tend to decrease. In addition, C.I. I. Since Solvent Yellow 162 is a dye, the light resistance of the image is also lowered.

  As described above, there is no yellow toner that has been improved at a higher level in terms of charging characteristics, transparency, coloring power, light resistance and low-temperature fixability.

JP 11-242357 A JP 2006-313302 A

  An object of the present invention is to provide a yellow toner having good charging characteristics, coloring power, transparency, light resistance, storage stability, and low-temperature fixability.

In order to achieve the above object, the present invention adds a polymerizable monomer composition containing a polymerizable monomer, a colorant, a polar resin and a release agent to an aqueous medium, and A granulating step of granulating the polymerizable monomer composition to form particles of the polymerizable monomer composition; and the polymerizable monomer contained in the particles of the polymerizable monomer composition. A yellow toner having toner particles produced through a polymerization step, wherein the polar resin is (i) a styrene resin, and (ii) an acid value of 10 mgKOH / g or more and 30 mgKOH / g or less. (Iii) The hydroxyl value is 5 mgKOH / g or more and 20 mgKOH / g or less, and the colorant is C.I. I. Solvent Yellow 162 and C.I. I. Pigment Yellow 155, and C.I. I. Content of Solvent Yellow 162 with respect to 100 parts by mass of the polymerizable monomer is A part by mass, and C.I. I. When the content of Pigment Yellow 155 with respect to 100 parts by mass of the polymerizable monomer is B parts by mass, and the content of the polar resin with respect to 100 parts by mass of the polymerizable monomer is C parts by mass, the following formula (1) , (2) and (3) are satisfied.
0.01 ≦ (A / B) ≦ 0.30 (1)
4.0 ≦ (A + B) ≦ 20.0 (2)
0.1 ≦ (C / B) ≦ 10.0 (3)

  According to the present invention, a specific polar resin and C.I. I. Solvent Yellow 162 and C.I. I. Pigment Yellow 155, and by adding a polar resin and a colorant to a yellow toner with a specific content by a specific manufacturing method, good charging characteristics, coloring power, transparency, light resistance, storage stability, and It is possible to provide a yellow toner having low-temperature fixability.

FIG. 3 is an enlarged view of a developing unit of the image forming apparatus. 1 is a cross-sectional view of an image forming apparatus using a yellow toner of the present invention.

In the toner of the present invention, a polymerizable monomer composition containing a polymerizable monomer, a colorant, a polar resin, and a release agent is added to an aqueous medium, and the polymerizable monomer composition is added to the aqueous medium. A granulation step of granulating a product to form particles of the polymerizable monomer composition; a polymerization step of polymerizing the polymerizable monomer contained in the particles of the polymerizable monomer composition; A yellow toner having toner particles manufactured through the following (hereinafter, also simply referred to as toner), wherein the polar resin is (i) a styrene-based resin, and (ii) an acid value of 10 mgKOH / g or more and 30 mgKOH / g (Iii) The hydroxyl value is 5 mgKOH / g or more and 20 mgKOH / g or less, and the colorant is C.I. I. Solvent Yellow 162 and C.I. I. Pigment Yellow 155, and C.I. I. Content of Solvent Yellow 162 with respect to 100 parts by mass of the polymerizable monomer is A part by mass, and C.I. I. When the content of Pigment Yellow 155 with respect to 100 parts by mass of the polymerizable monomer is B parts by mass, and the content of the polar resin with respect to 100 parts by mass of the polymerizable monomer is C parts by mass, the following formula (1) , (2) and (3) are satisfied.
0.01 ≦ (A / B) ≦ 0.30 (1)
4.0 ≦ (A + B) ≦ 20.0 (2)
0.1 ≦ (C / B) ≦ 10.0 (3)
As a result of intensive studies, the inventors have selected and blended the polar resin and the colorant in the toner as described above, so that the charging characteristics, light resistance, coloring power, transparency, storage stability, and The inventors have found that it is possible to improve the low-temperature fixability, and have completed the present invention.

  C. used in the toner of the present invention. I. Pigment Yellow 155 belongs to a bisacetoacetoallylide pigment, and is represented by the following structural formula [1].

  C. I. Pigment Yellow 155 is excellent in light resistance and heat resistance, and exhibits good dispersibility in toner particles using a polar resin. Particularly when used together with a polar resin having a specific acid value and hydroxyl group as in the present invention, C.I. I. The dispersibility of Pigment Yellow 155 can be improved. The reason for this is not yet known. I. The present inventors consider that the dispersibility is improved by the interaction between the carboxyl group or imino group present in Pigment Yellow 155 and the polar resin.

  Further, oil-soluble dyes C.I. I. Solvent Yellow 162 is represented by the following structural formula [2]. In the following structural formula [2], Me represents a methyl group, Et represents an ethyl group, and n-Bu represents a normal butyl group.

  C. I. Solvent Yellow 162 is a very useful dye that is excellent in compatibility with the binder resin and the release agent, and easily obtains high coloring power and transparency. On the other hand, however, the light resistance is inferior, and the image forming member that comes into contact with the toner when forming an image system is contaminated. I. There is a limit to the amount of Solvent Yellow 162 added.

  However, by adding a polar resin having a specific acid value and a hydroxyl value to the toner of the present invention and producing it in an aqueous medium by a specific production method, the polar resin tends to be unevenly distributed near the surface of the toner particles. Therefore, C.I. I. The uneven distribution of Solvent Yellow 162 on the toner particle surface can be suppressed. As a result, C.I. I. The said subject by Solvent Yellow 162 can be improved.

The toner of the present invention includes C.I. I. When the content of Pigment Yellow 155 with respect to 100 parts by mass of the polymerizable monomer is B parts by mass, and the content with respect to 100 parts by mass of the polymerizable monomer of the polar resin is C parts by mass,
0.1 ≦ (C / B) ≦ 10.0 (3)
Meet. Moreover, it is preferably 1.0 ≦ (C / B) ≦ 5.0. When the value of C / B is less than 0.1, C.I. I. Pigment Yellow 155 is not easily dispersed. When the value of C / B exceeds 10.0, C.I. I. A part of Pigment Yellow 155 tends to be unevenly distributed on the toner particle surface together with the polar resin, which may affect the charging characteristics of the toner.

Further, the toner of the present invention is C.I. I. When the content of Solvent Yellow 162 with respect to 100 parts by weight of the polymerizable monomer is A,
0.01 ≦ (A / B) ≦ 0.30 (1)
4.0 ≦ (A + B) ≦ 20.0 (2)
Meet.

  For formula (1), if the A / B value is less than 0.01, C.I. I. Since the dispersibility of Pigment Yellow 155 is insufficient, it is difficult to obtain sufficient coloring power. When the value of A / B exceeds 0.30, the light resistance is lowered and the image forming member such as a developing unit is likely to be contaminated.

  On the other hand, in the formula (2), when the value of A + B is less than 4.0, sufficient coloring power cannot be obtained, and when the value exceeds 20.0, C.I. I. Pigment Yellow 155 and C.I. I. The coexistence effect with Solvent Yellow 162 is reduced, and re-aggregation of these colorants proceeds, so that the transparency and charging characteristics are easily affected.

  C. I. Pigment Yellow 155 and C.I. I. Compared to the conventional toner using Solvent Yellow 162, the toner of the present invention is further added with a polar resin having a specific acid value and hydroxyl value, so that charging characteristics, coloring power, transparency, light resistance, and In addition, the low-temperature fixability can be improved at a high level.

  In the present invention, a styrenic resin having an acid value of 10 mgKOH / g to 30 mgKOH / g and a hydroxyl value of 5 mgKOH / g to 20 mgKOH / g is used as the polar resin. The toner of the present invention is produced in a water-based medium by a specific production method, so that the polar resin is C.I. I. Since the dispersibility of Pigment Yellow 155 can be improved, transparency and coloring power can be increased. Furthermore, C.I. has a function of improving the dispersibility of the yellow pigment. I. Even if the addition amount of Solvent Yellow 162 is reduced, a sufficient coloring power can be obtained, and a decrease in light resistance and poor charging can be suppressed.

  Further, the polar resin used in the present invention functions as an outer layer of toner particles by being unevenly distributed in the vicinity of the surface.

  Many capsule-type toner particles are separated into an inner layer and an outer layer. In this type of capsule toner, the inner layer is protected by the outer layer. However, when the adhesion between the inner layer and the outer layer is weak, if the toner is continuously stressed with continuous output, the outer layer may be peeled off or scraped, and the toner particle surface characteristics may change suddenly at a certain point.

  On the other hand, although the mechanism is not clear, it is considered that the adhesion between the outer layer and the inner layer is improved by using a styrenic polar resin as the polar resin in the present invention. Specifically, when producing toner particles in an aqueous medium, a styrene polar resin that has polarity and is easily compatible with the binder resin is used, so that the outer layer is sufficiently secured while ensuring sufficient adhesion with the inner layer. The inventors think that it is formed. In addition, since the polar resin has polarity and compatibility with the binder resin at the same time, the inventors consider that a concentration gradient of the resin having a polar group occurs in the toner particles.

  Further, when the suspension polymerization method is used as in the toner of the present invention, after the added styrene polar resin is dissolved in the polymerizable monomer, the polymerization reaction of the polymerizable monomer proceeds and The solubility of the polar resin in the polymerizable monomer gradually decreases, and a part of the added polar resin is phase-separated. On the other hand, there is a polar resin component that undergoes partial phase separation, and it is estimated that the resin component having a polar group has a gradient because the polar resin component is localized toward the toner particle surface.

  As a result, the adhesion between the inner layer and the outer layer in the toner particles and the toughness of the toner particles themselves are enhanced, and the developability and transferability of the toner are improved. Also, in the fixing process, due to the specific internal structure of the toner particles, when the wax dissolves when the toner is heated, the wax can easily move to the surface of the toner particles, thereby exhibiting an effect on the fixing characteristics. Yes.

  On the other hand, for example, when a polyester resin is used as the polar resin and a styrene resin is used as the binder resin, the polyester resin and the styrene resin are difficult to be combined, so that the polar resin and the binder resin are easily separated into layers. . For this reason, the adhesion between the inner layer and the outer layer of the toner particles is lowered, the outer layer is peeled off or scraped off, and the stress resistance of the toner is lowered. However, if the styrenic polar resin of the present invention and the polyester resin are used in appropriate addition amounts, the durability and fixability of the toner can be further improved.

  The content C of the styrenic polar resin used in the present invention with respect to 100 parts by mass of the polymerizable monomer is preferably 1.5 parts by mass or more and 30.0 parts by mass or less, more preferably 5.0 parts by mass. Part to 30.0 parts by mass. When the content C of the polar resin is 1.5 parts by mass or more and 30.0 parts by mass or less, the storage stability and low-temperature fixability of the toner are further improved.

  Examples of the polar resin used in the present invention include C.I. I. From the viewpoint of dispersibility of Pigment Yellow 155, a resin obtained by copolymerizing the following (a), (b) and (c) is preferable. (A) methacrylic acid and / or acrylic acid, (b) methacrylic acid alkyl ester and / or acrylic acid alkyl ester (however, a hydroxyl group is bonded to the alkyl group of methacrylic acid alkyl ester or acrylic acid alkyl ester) ), (C) styrene.

  The styrenic resin described in the present invention is a resin obtained by polymerizing styrene or / and a styrene derivative, or obtained by copolymerizing styrene or / and a styrene derivative and another vinyl polymer. It means the resin that is made.

  In addition, the polar resin used in the present invention preferably has a weight average molecular weight (Mw) of 8,000 or more and 30,000 or less because the durability and fixability of the toner are further improved.

  The binder resin used in the present invention includes generally used styrene-acrylic copolymers, styrene-methacrylic copolymers, epoxy resins, and styrene-butadiene copolymers. As the polymerizable monomer, a vinyl polymerizable monomer capable of radical polymerization can be used. As the vinyl polymerizable monomer, a monofunctional polymerizable monomer or a polyfunctional polymerizable monomer can be used.

  Examples of the polymerizable monomer used in the binder resin include styrene; styrene monomers such as o-methylstyrene, m-methylstyrene, p-methylstyrene, m-ethylstyrene, and p-ethylstyrene; acrylic acid Methyl, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, octyl acrylate, octyl methacrylate, dodecyl acrylate, dodecyl methacrylate, stearyl acrylate, Stearyl methacrylate, behenyl acrylate, behenyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate, meta Acrylic acid ester monomer such as diethylaminoethyl acrylate or methacrylic acid ester monomer; ene monomer such as butadiene, isoprene, cyclohexene, acrylonitrile, methacrylonitrile, acrylic acid amide, methacrylic acid amide It is done.

  These may be used alone or in general by appropriately mixing monomers with reference to the theoretical glass transition temperature (Tg) described in the publication Polymer Handbook 2nd edition III-p139 to 192 (manufactured by John Wiley & Sons). Used.

  In the case of producing the toner of the present invention, it is also a preferred form to add a low molecular weight polymer in order to obtain a preferable molecular weight distribution of the toner of the present invention. The low molecular weight polymer can be added to the polymerizable monomer composition when the toner is produced by a suspension polymerization method. The low molecular weight polymer preferably has a weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of 2,000 to 5,000 and Mw / Mn of less than 4.5. More preferably, Mw / Mn is less than 3.0.

  Examples of the low molecular weight polymer include low molecular weight polystyrene, low molecular weight styrene-acrylic acid ester copolymer, and low molecular weight styrene-acrylic copolymer.

  In the present invention, a polar resin such as a polyester resin or a polycarbonate resin can be used in combination with the binder resin described above as a surface layer resin for toner particles.

  In the present invention, in order to increase the mechanical strength of the toner particles and to control the molecular weight of the binder resin of the toner particles, a crosslinking agent may be used when the binder resin is synthesized.

  As the crosslinking agent used in the present invention, difunctional linking agents such as divinylbenzene, bis (4-acryloxypolyethoxyphenyl) propane, ethylene glycol diacrylate, 1,3-butylene glycol diacrylate, 1,4- Butanediol diacrylate, 1,5-pentanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol # 200, # 400, # 600 diacrylate, dipropylene glycol diacrylate, polypropylene glycol diacrylate, polyester type diacrylate (MANDA Japan Drugs), and include those instead dimethacrylate above diacrylate.

  Polyfunctional crosslinkers include pentaerythritol triacrylate, trimethylol ethane triacrylate, trimethylol propane triacrylate, tetramethylol methane tetraacrylate, oligoester acrylate and its methacrylate, 2,2-bis (4-methacryloxypolyethoxy Phenyl) propane, diallyl phthalate, triallyl cyanurate, triallyl isocyanurate and triallyl trimellitate. The addition amount of these crosslinking agents is preferably 0.05 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the polymerizable monomer.

  In the toner of the present invention, a charge control agent can be mixed with toner particles and used as necessary. By blending the charge control agent, it is possible to stabilize the charging characteristics of the toner and to control the optimum triboelectric charge amount according to the development system.

  As the charge control agent, a known one can be used, and a charge control agent that has a high charging speed and can stably maintain a constant charge amount is particularly preferable. Further, when the toner is produced by a direct polymerization method, a charge control agent having a low polymerization inhibitory property and substantially free from a solubilized product in an aqueous dispersion medium is particularly preferable.

  Examples of charge control agents that control toner to negative charge include monoazo metal compounds, acetylacetone metal compounds, aromatic oxycarboxylic acids, aromatic dicarboxylic acids, oxycarboxylic acids, and dicarboxylic acid-based metal compounds , Aromatic oxycarboxylic acids, aromatic mono- and polycarboxylic acids and metal salts thereof, anhydrides, esters, phenol derivatives such as bisphenol, urea derivatives, metal-containing salicylic acid compounds, metal-containing naphthoic acid compounds, boron compounds A quaternary ammonium salt and calixarene are mentioned.

  Examples of charge control agents that control the toner to be positively charged include nigrosine-modified products such as nigrosine and fatty acid metal salts; guanidine compounds; imidazole compounds; tributylbenzylammonium-1-hydroxy-4-naphthosulfone. Acid salts, quaternary ammonium salts such as tetrabutylammonium tetrafluoroborate, and onium salts such as phosphonium salts and analogs thereof and their lake pigments; triphenylmethane dyes and lake lake pigments (as lake agents) Phosphotungstic acid, phosphomolybdic acid, phosphotungstic molybdic acid, tannic acid, lauric acid, gallic acid, ferricyanide, ferrocyanide, etc.); metal salts of higher fatty acids; dibutyltin oxide, dioctyltin oxide, dicycline Hexyl tin oxide such as diorganotin oxide; dibutyl tin borate, dioctyl tin borate, such as diorganotin tin borate such dicyclohexyl tin borate, and the like.

  The toner of the present invention can contain these charge control agents alone or in combination of two or more.

  Among these charge control agents, a metal-containing salicylic acid-based compound is preferable in order to sufficiently exhibit the effects of the present invention, and the metal is particularly preferably aluminum or zirconium. The most preferred charge control agent is an aluminum 3,5-di-tert-butylsalicylate compound.

  The blending amount of the charge control agent is preferably 0.01 to 20 parts by mass, more preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the binder resin. However, it is not essential to add a charge control agent to the toner of the present invention, and the toner does not necessarily contain a charge control agent by actively utilizing frictional charging with the toner layer thickness regulating member or the toner carrier. There is no need to let it.

  In the present invention, a polymer having a sulfonic acid group, a sulfonic acid group, or a sulfonic acid ester group is used for the purpose of stabilizing the charging characteristics of the toner and improving the dispersibility of CI Pigment Yellow 155. Alternatively, it is preferable to use a copolymer.

  It is possible to further improve the dispersibility of CI Pigment Yellow 155 by including a polymer or copolymer having a sulfonic acid group, a sulfonic acid group or a sulfonic acid ester group in the toner particles together with a polar resin. It is. As a result, the coloring power of the toner can be improved. In addition, since a polymer or copolymer having a sulfonic acid group, a sulfonic acid group, or a sulfonic acid ester group is likely to be unevenly distributed on the surface layer of the toner particles when the toner particles are produced in an aqueous medium, C.I. The uneven distribution of the toner particles of Yellow 162 on the surface layer can be suppressed. As a result, it is possible to improve the contamination of the members on the developing device or the like, the deterioration of the charging characteristics of the toner, and the good storage stability and low-temperature fixability of the toner.

  In addition, when the toner of the present invention is produced by the suspension polymerization method, the addition of a polymer or copolymer having a sulfonic acid group, a sulfonic acid group or a sulfonic acid ester group can stabilize the granulation. The core-shell structure of the toner particles in the polymerization stage is promoted. Therefore, it is possible to further improve both the durability and the fixing property of the toner.

  As monomers used for producing a polymer or copolymer having a sulfonic acid group, a sulfonic acid group salt or a sulfonic acid ester group, styrene sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid, 2 -Methacrylamide-2-methylpropane sulfonic acid, vinyl sulfonic acid, methacryl sulfonic acid and their alkyl esters.

  As a monomer that forms a copolymer with the above monomer, there is a vinyl polymerizable monomer, and a monofunctional polymerizable monomer or a polyfunctional polymerizable monomer can be used. Further, the addition amount of the polymer or copolymer having a sulfonic acid group, a sulfonic acid group or a sulfonic acid ester group is preferably 0.01 to 10 parts by mass with respect to 100 parts by mass of the binder resin.

The following are mentioned as a wax component used for this invention.
Petroleum waxes and derivatives thereof such as paraffin wax, microcrystalline wax, petrolactam; montan wax and derivatives thereof; hydrocarbon waxes and derivatives thereof according to the Fischer-Tropsch method; polyolefin waxes and derivatives thereof such as polyethylene wax and polypropylene wax; Natural waxes such as waxes and candelilla waxes and derivatives thereof; higher aliphatic alcohols; fatty acids such as stearic acid and palmitic acid; acid amide waxes; ester waxes; hydrogenated castor oil and derivatives thereof; plant waxes;

  Examples of the derivatives include oxides, block copolymers with vinyl monomers, and graft modified products.

  Among these, ester wax and hydrocarbon wax are preferable from the viewpoint of excellent releasability. Further, in the toner of the present invention, it is more preferable to use a hydrocarbon wax in order to easily control the core-shell structure and to easily exhibit the effects of the present invention.

The content of the wax component is preferably 4 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the binder resin. When the wax component is 4 parts by mass or more and 25 parts by mass or less, wrapping resistance is improved by having an appropriate wax bleeding property when the toner is heated and pressurized. Furthermore, the exposure of the toner to the toner during development and transfer is less exposed to the wax on the toner surface, and each toner can obtain uniform triboelectric charging.
In the toner of the present invention, an inorganic fine powder may be externally added as a fluidizing agent.

  The inorganic fine powder externally added to the toner particles of the present invention preferably contains a silica fine powder. The number average primary particle size of the silica fine powder is preferably 4 nm or more and 80 nm or less. In the present invention, when the number average primary particle diameter is in the above range, the fluidity of the toner is improved and the storage stability of the toner is also improved.

The number average primary particle size of the inorganic fine powder is measured as follows.
The number average primary particle size is observed with a scanning electron microscope, and the particle size of 100 inorganic fine powders in the visual field is measured to determine the average particle size.

  Further, as the inorganic fine powder, a fine powder of titanium oxide, alumina or a double oxide thereof can be used together with the fine silica powder. As the inorganic fine powder used in combination, titanium oxide is particularly preferable.

The silica fine powder includes both dry silica produced by vapor phase oxidation of silicon halide or dry silica called fumed silica, and wet silica produced from water glass. As the silica, dry silica having less silanol groups on the surface and inside of silica and less production residue of Na ₂ O and SO ₃ ²⁻ is preferable. In addition, dry silica can also be used to obtain composite fine powders of silica and other metal oxides by using other metal halogen compounds such as aluminum chloride and titanium chloride together with silicon halogen compounds in the production process. Silica also includes them.

  The inorganic fine powder is added for improving the fluidity of the toner and making the frictional electrification of the toner particles uniform. Hydrophobic treatment of inorganic fine powder enables adjustment of the triboelectric charge amount of the toner and improvement of environmental stability, in particular, characteristics in a high humidity environment. It is preferable to use a body. When the inorganic fine powder externally added to the toner particles absorbs moisture, the amount of triboelectric charge as the toner decreases, and the developability and transferability tend to decrease.

Examples of the treatment agent for the hydrophobic treatment of the inorganic fine powder include the following.
Unmodified silicone varnish, various modified silicone varnishes, unmodified silicone oil, various modified silicone oils, silane compounds, silane coupling agents, other organosilicon compounds, and organotitanium compounds. These treatment agents may be used alone or in combination.

  Among these, inorganic fine powder treated with silicone oil is preferable. More preferably, when the inorganic fine powder is hydrophobized with a coupling agent, or at the same time or after the treatment, the hydrophobized inorganic fine powder treated with silicone oil is treated with silicone oil even in a high humidity environment. Is kept high and the selective developability is reduced.

  The toner used in the present invention includes a polymerizable monomer composition containing a polymerizable monomer, a colorant, a polar resin and a release agent in an aqueous medium, and the polymerizable monomer in the aqueous medium. A granulation step of granulating a body composition to form particles of the polymerizable monomer composition; and a toner obtained by polymerizing the polymerizable monomer contained in the particles of the polymerizable monomer composition Manufactured through a polymerization process to obtain particles. Since it is necessary for the toner of the present invention to control the presence of the polar resin, the colorant and the release agent in the toner particles, it is important to obtain toner particles by granulating in an aqueous medium.

Hereinafter, a method for producing the toner particles will be described by exemplifying a suspension polymerization method suitable for obtaining the toner particles used in the present invention. Toner particles are prepared by dissolving or dispersing a polymerizable monomer, a colorant, a wax component and other additives as necessary used in the production of the binder resin, dissolving a polymerization initiator in this, and polymerizing the toner particles. A functional monomer composition is prepared. Next, toner particles are manufactured by suspending the polymerizable monomer composition in an aqueous medium containing a dispersant and performing polymerization. The polymerization initiator may be added simultaneously with the addition of other additives to the polymerizable monomer, or may be mixed immediately before being suspended in the aqueous medium. Also, a polymerization initiator dissolved in a polymerizable monomer or solvent can be added immediately after granulation and before starting the polymerization reaction.
As the dispersant, known inorganic and organic dispersants can be used.

Specifically, examples of the inorganic dispersant include the following.
Tricalcium phosphate, magnesium phosphate, aluminum phosphate, zinc phosphate, magnesium carbonate, calcium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, calcium metasilicate, calcium sulfate, barium sulfate, bentonite, silica, alumina Is mentioned.

On the other hand, examples of the organic dispersant include the following.
Polyvinyl alcohol, gelatin, methyl cellulose, methyl hydroxypropyl cellulose, ethyl cellulose, carboxymethyl cellulose sodium salt, starch.

  Further, commercially available nonionic, anionic and cationic surfactants can be used as the dispersant. Examples of such surfactants include the following. Sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate, sodium oleate, sodium laurate, potassium stearate, calcium oleate.

  As the dispersant, an inorganic poorly water-soluble dispersant is preferable, and it is preferable to use a poorly water-soluble inorganic dispersant that is soluble in an acid.

  In the present invention, when preparing a water-based dispersion medium using a hardly water-soluble inorganic dispersant, the amount of these dispersants used is 0.2 mass relative to 100 parts by mass of the polymerizable monomer. It is preferable that it is at least 2.0 parts by mass. In the present invention, it is preferable to prepare an aqueous dispersion medium using 300 parts by mass or more and 3,000 parts by mass or less of water with respect to 100 parts by mass of the polymerizable monomer composition.

  In the present invention, when preparing an aqueous dispersion medium in which the poorly water-soluble inorganic dispersant as described above is dispersed, a commercially available dispersant may be used as it is. Further, in order to obtain dispersant particles having a fine uniform particle size, the above water-insoluble inorganic dispersant may be produced in a liquid medium such as water under high-speed stirring to prepare an aqueous dispersion medium. For example, when tricalcium phosphate is used as a dispersant, it is possible to form a tricalcium phosphate microparticle by mixing a sodium phosphate aqueous solution and a calcium chloride aqueous solution under high-speed stirring.

  The following are mentioned as a polymerization initiator used for this invention when manufacturing a toner by the said suspension polymerization method.

  2,2′-azobis- (2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile, 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis Azo or diazo polymerization initiators such as -4-methoxy-2,4-dimethylvaleronitrile, azobisisobutyronitrile; benzoyl peroxide, methyl ethyl ketone peroxide, diisopropyl peroxycarbonate, cumene hydroperoxide, 2,4-dichlorobenzoyl Peroxide-based polymerization initiators such as peroxide, lauroyl peroxide, tert-butyl-peroxypivalate.

  Although the usage-amount of these polymerization initiators changes with the target degree of polymerization, it is generally 3 mass parts or more and 20 mass parts or less with respect to 100 mass parts of said polymerizable monomers. The kind of the polymerization initiator is slightly different depending on the polymerization method, but is selected with reference to the 10-hour half-life temperature and used alone or in combination.

Next, the image forming method used in the present invention will be described with reference to FIGS.
A sectional view of the image forming apparatus used in this embodiment is shown in FIG. The image forming apparatus shown in FIG. 2 is a laser beam printer using a transfer type electrophotographic process. In particular, FIG. 2 shows a cross-sectional view of a tandem color LBP (color laser printer).

  In FIG. 2, reference numeral 101 (101a to 101d) denotes a drum-type electrophotographic photosensitive member (hereinafter also referred to as a photosensitive drum) as a latent image carrier that rotates in a direction indicated by an arrow (counterclockwise) at a predetermined process speed. . The photosensitive drums 101a, 101b, 101c, and 101d sequentially share the yellow (Y) component, magenta (M) component, cyan (C) component, and black (Bk) component of the color image.

  Hereinafter, the Y, M, C, and Bk image forming apparatuses are referred to as a unit a, a unit b, a unit c, and a unit d, respectively.

  These photosensitive drums 101a to 101d are rotationally driven by a drum motor (DC servo motor) (not shown), but independent driving sources may be provided for the respective photosensitive drums 101a to 101d. The rotational drive of the drum motor is controlled by a DSP (digital signal processor) (not shown), and other controls are performed by a CPU (not shown).

  The electrostatic adsorption conveyance belt 109a is stretched around a driving roller 109b, fixed rollers 109c and 109e, and a tension roller 109d. The electrostatic adsorption conveyance belt 109a is rotationally driven by the driving roller 109b in the direction indicated by the arrow in FIG. To do.

Hereinafter, unit a (yellow) of the four colors will be described as an example.
The photosensitive drum 101a is uniformly charged to a predetermined polarity and potential by the primary charging means 102a during its rotation. The photosensitive drum 101a is exposed to a light image by a laser beam exposure means (hereinafter referred to as a scanner) 103a, and an electrostatic latent image of image information is formed on the photosensitive drum 101a.

  Next, a toner image is formed on the photosensitive drum 101a by the developing unit 104a, and the electrostatic latent image is visualized. Similar steps are performed for the other three colors (magenta (B), cyan (C), and black (Bk)).

  Thus, the four-color toner images are synchronized with the photosensitive drums 101a to 101d by the registration rollers 108c that stop and re-transport the recording medium S conveyed by the paper feed roller 108b at a predetermined timing. The toner images are sequentially transferred onto the recording medium S at the nip portion with the belt 109a. At the same time, the photosensitive drums 101a to 101d after the transfer of the toner image to the recording medium S are subjected to repeated image formation by removing residual deposits such as transfer residual toner by the cleaning means 106a, 106b, 106c and 106d. .

  The recording medium S on which the toner images are transferred from the four photosensitive drums 101a to 101d is separated from the surface of the electrostatic attraction / conveyance belt 109a by the driving roller 109b and sent to the fixing device 110, and the toner image is fixed by the fixing device 110. Then, the sheet is discharged to the discharge tray 113 by the discharge roller 110c.

  Next, referring to an enlarged view (FIG. 1) of the developing portion of the image forming apparatus, a specific example of an image forming method using a non-magnetic one-component contact developing method that can be applied to the present invention will be described. In FIG. 1, the developing unit 13 is located in a developer container 23 containing a nonmagnetic toner 17 as a one-component developer, and an opening extending in the longitudinal direction in the developer container 23. A photosensitive drum) 10 and a toner carrier 14 disposed opposite to each other, and the electrostatic latent image on the latent image carrier 10 is developed and visualized. The latent image carrier contact charging member 11 is in contact with the latent image carrier 10. The bias of the latent image carrier contact charging member 11 is applied by a power source 12.

  The toner carrier 14 is horizontally provided with the substantially right half-periphery surface shown in the drawing through the opening into the developer container 23 and the left substantially half-periphery surface exposed outside the developer container 23. The surface exposed to the outside of the developer container 23 is in contact with the latent image carrier 10 located on the left side of the developing unit 13 as shown in FIG.

  The toner carrier 14 is rotationally driven in the direction of arrow B, the peripheral speed of the latent image carrier 10 is 50 to 170 mm / s, and the peripheral speed of the toner carrier 14 is 1 to 2 with respect to the peripheral speed of the latent image carrier 10. It is rotating at twice the peripheral speed.

  At a position above the toner carrier 14, a metal plate such as SUS, a rubber material such as urethane or silicone, a SUS or phosphor bronze metal thin plate having spring elasticity, and a contact surface side to the toner carrier 14. A restricting member 16 such as a rubber material adhered to is supported by the restricting member support metal plate 24 and is provided so that the vicinity of the free end side is in contact with the outer peripheral surface of the toner carrying member 14 by surface contact. The contact direction is a so-called counter direction in which the tip side with respect to the contact portion is located upstream of the rotation direction of the toner carrier 14. As an example of the regulating member 16, a plate-like urethane rubber having a thickness of 1.0 mm is bonded to the regulating member support sheet metal 24, and the contact pressure (linear pressure) with respect to the toner carrier 14 is appropriately set. is there. The contact pressure is preferably 20 to 300 N / m. The measurement of the contact pressure is converted from a value obtained by inserting three metal thin plates with known friction coefficients into the contact portion and pulling out the central one with only a spring. The regulating member 16 having a rubber material or the like bonded to the abutting surface is desirable in terms of adhesion to the toner, and can suppress the fusion and fixing of the toner to the regulating member in long-term use. Further, the restricting member 16 may be in contact with the toner carrier 14 by edge contact in which the tip is contacted. In the case of edge contact, it is more desirable in terms of toner layer regulation to set the contact angle of the regulating member with respect to the tangent of the toner carrying body at the contact with the toner carrying body to be 40 degrees or less.

  The toner supply roller 15 is in contact with the contact portion of the regulating member 16 with the surface of the toner carrier 14 on the upstream side in the rotation direction of the toner carrier 14 and is rotatably supported. The contact width of the toner supply roller 15 with respect to the toner carrier 14 is preferably 1 to 8 mm, and it is preferable that the toner carrier 14 has a relative speed at the contact portion.

  The charging roller 29 is not essential for the image forming method of the present invention, but is preferably installed. The charging roller 29 is an elastic body such as NBR or silicone rubber, and is attached to the suppression member 30. The contact load of the charging member 29 on the toner carrier 14 by the suppressing member 30 is set to 0.49 to 4.9N. Due to the contact of the charging roller 29, the toner layer on the toner carrier 14 is finely filled and uniformly coated. The longitudinal positional relationship between the regulating member 16 and the charging roller 29 is preferably arranged so that the charging roller 29 can reliably cover the entire contact area of the regulating member 16 on the toner carrier 14.

  Further, for the driving of the charging roller 29, a driven or the same peripheral speed is indispensable between the charging roller 29 and the toner carrier 14, and if a peripheral speed difference occurs between the charging roller 29 and the toner carrier 14, the toner coat becomes uneven. This is not preferable because unevenness occurs on the image.

  The bias of the charging roller 29 is applied by a power source 27 between the toner carrier 14 and the latent image carrier 10 in a direct current (27 in FIG. 1), and the nonmagnetic toner 17 on the toner carrier 14 is charged by the charging roller. From 29, charge is applied by discharge.

  The bias of the charging roller 29 is equal to or higher than the discharge start voltage having the same polarity as that of the nonmagnetic toner, and is set so that a potential difference of 1,000 to 2,000 V is generated with respect to the toner carrier 14.

  After being charged by the charging roller 29, the toner layer formed as a thin layer on the toner carrier 14 is uniformly conveyed to a developing unit that is a portion facing the latent image carrier 10.

  In this developing unit, the toner layer formed as a thin layer on the toner carrier 14 is transferred to the latent image by a DC bias applied between the toner carrier 14 and the latent image carrier 10 by the power source 27 shown in FIG. The electrostatic latent image on the carrier 10 is developed as a toner image.

  The present invention will be specifically described with reference to the following examples. The method for producing polar resin and toner will be described below. Unless otherwise specified, all parts and% in the examples and comparative examples are based on mass.

(Production example of polar resin (1))
700 parts by mass of xylene is put into the flask, and the inside of the container is sufficiently purged with nitrogen while stirring, and then heated to reflux.
Under this reflux,
-Styrene 91.70 mass parts-Methyl methacrylate 2.50 mass parts-Methacrylic acid 3.30 mass parts-2-hydroxyethyl methacrylate 2.50 mass parts-Di-tert-butyl peroxide 2.00 mass parts After adding the mixed solution, polymerization was carried out at a polymerization temperature of 140 ° C. for 5 hours. Thereafter, the solvent removal step was performed for 3 hours under reduced pressure to remove xylene and pulverization to obtain a polar resin (1).

(Production example of polar resins (2) to (13))
In the production example of the polar resin (1), it was produced in the same manner as in the production example of the polar resin (1) except that the content of the formulation was changed as described in Table 1. The obtained polar resins are referred to as polar resins (2) to (13), respectively.

  Table 1 shows the acid value, hydroxyl value, weight average molecular weight, monomer composition, and di-tert-butyl peroxide addition amount of the polar resins (1) to (13).

[Toner Production Example 1]
Toner (A) was produced by the following procedure.

  To 1,300 parts by weight of ion-exchanged water heated to 60 ° C., 9 parts by weight of tricalcium phosphate and 11 parts by weight of hydrochloric acid are added, and using a TK homomixer (made by Tokushu Kika Kogyo), An aqueous medium was prepared by stirring at 10,000 r / min.

Moreover, the following material was melt | dissolved at 100 r / min with the propeller-type stirring apparatus, and the solution was prepared.
Styrene 69.0 parts by mass n-butyl acrylate 31.0 parts by mass sulfonic acid group-containing resin (styrene: 2-ethylhexyl acrylate: 2-acrylamido-2-methylpropanesulfonic acid (mass ratio) = 80:14: 6 copolymer, glass transition temperature (Tg) = 76 ° C., weight average molecular weight (Mw) 18,000, number average molecular weight (Mn) = 5,600)
1.0 part by mass / polar resin (1) 12.0 parts by mass

Next, the following materials were added to the solution.
・ C. I. Solvent Yellow 162 1.0 part by mass / C.I. I. Pigment Yellow 155 6.0 parts by mass / polyester resin (polycondensation product of bisphenol A-propylene oxide 2 mol adduct and isophthalic acid, Tg = 65 ° C., Mw = 10,000, Mn = 6,000)
3 parts by mass, negative charge control agent (Bontron E-88, manufactured by Orient Chemical Co.) 0.7 parts by mass, hydrocarbon wax having a maximum endothermic peak peak temperature of 77 ° C (HNP-51, manufactured by Nippon Seiwa Co., Ltd.)
8.0 parts by mass Thereafter, the mixed solution was heated to 60 ° C., and then stirred and dissolved and dispersed with a TK homomixer (manufactured by Tokushu Kika Kogyo) at 9,000 r / min.

  In this, 8.0 parts by mass of a polymerization initiator 2,2'-azobis (2,4-dimethylvaleronitrile) was dissolved to prepare a polymerizable monomer composition. The polymerizable monomer composition was charged into the aqueous medium, and the mixture was granulated by stirring at 15,000 r / min for 10 minutes at a temperature of 60 ° C. using a TK homomixer.

  Thereafter, the mixture was transferred to a propeller type stirring device and reacted at a temperature of 70 ° C. for 5 hours while stirring at 100 r / min, and then heated to a temperature of 80 ° C. and further reacted for 5 hours to produce toner particles. After completion of the polymerization reaction, the slurry containing the particles was cooled, washed with 10 times the amount of water as the slurry, filtered and dried, and then the particle size was adjusted by classification to obtain toner particles.

Hydrophobic silica fine powder (number average 1) treated with dimethyl silicone oil (20% by mass) as a fluidity improver and frictionally charged to the same polarity (negative polarity) as the toner particles with respect to 100 parts by mass of the toner particles. A toner (A) was obtained by mixing 2.0 parts by mass of a secondary particle size of 10 nm and a BET specific surface area of 170 m ^{2 /} g with a Henschel mixer (manufactured by Mitsui Miike) at 3,000 r / min for 15 minutes.

[Toner Production Examples 2 to 29]
In Toner Production Example 1, the type and amount of polar resin added; I. Pigment Yellow 155 addition amount, C.I. I. A toner was produced in the same manner as in Toner Production Example 1 except that the addition amount of Solvent Yellow 162 and the sulfonic acid group-containing resin were changed as shown in Table 2. The obtained toners are referred to as toners (B) to (S) and (a) to (j), respectively. In Table 2, PY155 is C.I. I. Pigment Yellow 155 and SY162 are C.I. I. It means Solvent Yellow 162.

  Table 3 shows values of A / B, A + B, C / B, and C relating to the toners of the toners (A) to (S) and (a) to (j).

(Examples 1-19 and Comparative Examples 1-10)
The obtained toners (A) to (S) and (a) to (j) were evaluated for each toner based on the following evaluation method. The obtained evaluation results are shown in Tables 4 and 5.

  A specific evaluation method for toner will be described below.

Evaluation of tinting strength A solid image was printed on the transfer paper so that the applied amount of toner was 0.45 mg / cm ^2, and the image density of the solid image was measured using “Mubes Reflectometer RD918” (manufactured by Magbes). It was measured.
A: Image density 1.40 or more B: Image density 1.35 or more, less than 1.40 C: Image density 1.20 or more, less than 1.35 D: Image density 1.10 or more, 1.20 Less than E: Image density is less than 1.10

Evaluation of Transparency A solid image was printed on an OHP sheet “CG3700” (manufactured by 3M) so that the applied amount of toner was 0.6 mg / cm ^2, and a transparent image was obtained using OHP “9505” (manufactured by 3M). The image projected on the white wall was visually evaluated.
A: Excellent in transparency and vivid.
B: Transparency is good, but vividness is slightly inferior.
C: Transparency is slightly inferior and vividness is also inferior.
D: There is dullness, and transparency and vividness are inferior.
E: The transparency is greatly inferior.

Evaluation of light resistance The amount of applied toner on glossy paper “HP Color Laser Photo Paper, glossy (220 g / m ² )” (manufactured by HP) so that the image density is 1.30 with the above-mentioned “Mubes reflectometer RD918”. Print a solid image with Next, the density of the image after performing the light resistance test of the above solid image for 350 hours under the conditions of illuminance of 80000 lx, temperature of 24 ° C. and humidity of 60% with “Super Fluorescent Light Fade Meter” (manufactured by Suga Test Instruments Co., Ltd.) The reduction rate (%) was calculated.
A: 80% or more B: 70% or more, less than 80% C: 60% or more, less than 70% D: 50% or more, less than 60% E: less than 50%

Evaluation of storability 10 g of toner was placed in a 50 ml polycup. The state of the toner when this was left in a constant temperature bath at 55 ° C. for 72 hours was visually judged as follows.
A: Not blocking, almost the same as the initial state.
B: Although slightly agglomerated, it is in a state of collapsing with the rotation of the polycup, and there is no particular problem.
C: Although it seems to be agglomerated, it breaks down by hand and immediately loosens.
D: It seems to be agglomerated and some solidification is observed.
E: Aggregation is intense and solidified.

Evaluation of low-temperature fixability Plain paper for copying machines (64 g / m ² paper) was used as a transfer material, and an unfixed solid image with a toner paste amount of 0.7 mg / cm ² was obtained. This was fixed at a process speed of 270 mm / s using a fixing machine of IRC3200 (manufactured by Canon Inc.). The fixing temperature was decreased by 5 ° C from 200 ° C to 130 ° C. The image was reciprocated five times with sylbon paper applied with a load of 4.9 kPa, and the temperature at which the density reduction rate was 20% or more was evaluated as the minimum fixing temperature.
A: Fixing lower limit temperature is less than 145 ° C. B: Fixing lower limit temperature is 145 ° C. or more and less than 155 ° C. C: Fixing lower limit temperature is 155 ° C. or more and less than 165 ° C. D: Fixing lower limit temperature is 165 ° C. or more, 170 Less than ℃ E: Fixing lower limit temperature is 170 ℃ or more

In the developing device of the one-component contact developing system shown in FIG. 1, fog and member contamination are evaluated by filling a developer container with 70 g of toner and in an environment of normal temperature and normal humidity (temperature 23.5 ° C., humidity 60% RH). Leave for 24 hours. At this time, the transfer paper is also left as it is. In the evaluation regarding developability, Xerox 4200 (manufactured by Xerox Co., Ltd.) (75 g / m ² paper) was used as the transfer paper. Thereafter, the developing device shown in FIG. 1 was attached to the unit c of FIG. 2 in an environment of normal temperature and normal humidity (temperature 23.5 ° C., humidity 60% RH). In the yellow single color mode, the process speed was 250 mm / s, and continuous output was performed on a chart with a printing ratio of 2%. Evaluation on developability was carried out at the time of initial (first sheet) / 5,000 sheets / 10,000 sheets, and fog and member contamination were confirmed.

Fog evaluation The fog evaluation method outputs an image having a white background portion, and the whiteness (reflectance Ds (%)) of the white background portion of the printout image measured by “REFLECTMETER MODEL TC-6DS” (manufactured by Tokyo Denshoku). The fog density (%) (= Dr (%) − Ds (%)) was calculated from the difference between the whiteness (average reflectance Dr (%)) of the transfer paper and the image fog at the end of the durability evaluation. . A blue filter was used as the filter.
A: Less than 0.5% B: 0.5% or more, less than 1.0% C: 1.0% or more, less than 1.5% D: 1.5% or more, less than 2.0 E: 2.0 that's all

Evaluation of member contamination The member contamination was confirmed by visual observation of the charging roller.
A: The member is not contaminated.
B: The member is slightly contaminated, but no image defect occurs.
C: The member is contaminated and image defects are slightly generated.
D: Member contamination and image defects occur.
E: Member contamination and image defects are remarkable.

10 Latent image carrier (photosensitive drum)
DESCRIPTION OF SYMBOLS 11 Latent image carrier contact charging member 12 Power supply 13 Development unit 14 Toner carrier 15 Toner supply roller 15a Toner supply roller shaft core 16 Restriction member 17 Nonmagnetic toner 23 Developer container 24 Restriction member support sheet metal 25 Toner stirring blade 26 Toner carrier bearing 27 Power supply 29 Charging roller 30 Suppressing member 101a to 101d Photosensitive drum 102a to 102d Primary charging means 103a to 103d Scanner 104a to 104d Developing unit 106a to 106d Cleaning means 108b Paper feed roller 108c Registration roller 109a Electrostatic adsorption conveyance Belt 109b Driving roller 109c, 109e Fixed roller 109d Tension roller 110 Fixing device 110c Discharging roller 111 Fixing device frame 113 Discharging tray 114-116 Discharging roller S Recording medium

Claims (5)

A polymerizable monomer composition containing a polymerizable monomer, a colorant, a polar resin and a release agent is added to the aqueous medium, and the polymerizable monomer composition is granulated in the aqueous medium. A granulating step of forming particles of the polymerizable monomer composition, and a polymerization step of polymerizing the polymerizable monomer contained in the particles of the polymerizable monomer composition;
A method for producing yellow toner particles having
The polar resin is
(I) a styrene resin;
(Ii) The acid value is 10 mgKOH / g or more and 30 mgKOH / g or less,
(Iii) The hydroxyl value is 5 mgKOH / g or more and 20 mgKOH / g or less,
The colorant is C.I. I. Solvent Yellow 162 and C.I. I. Pigment Yellow 155,
C. above. I. Content of Solvent Yellow 162 with respect to 100 parts by mass of the polymerizable monomer is A part by mass, and C.I. I. When the content of Pigment Yellow 155 with respect to 100 parts by mass of the polymerizable monomer is B parts by mass, and the content of the polar resin with respect to 100 parts by mass of the polymerizable monomer is C parts by mass, the following formula (1) , (2) and (3) satisfying the relationship, the method for producing yellow toner particles,
0.01 ≦ (A / B) ≦ 0.30 (1)
4.0 ≦ (A + B) ≦ 20.0 (2)
0.1 ≦ (C / B) ≦ 10.0 (3) The method for producing yellow toner particles according to claim 1 , wherein the C / B satisfies 1.0 ≦ (C / B) ≦ 5.0. The method for producing yellow toner particles according to claim 1 or 2 , wherein the C is 1.5 parts by mass or more and 30.0 parts by mass or less. The polar resin is below (a), (b) and yellow toner according to any one of claims 1 to 3, characterized in that the (c) is a resin obtained by copolymerizing Particle production method.
(A) Methacrylic acid and / or acrylic acid (b) Methacrylic acid alkyl ester and / or acrylic acid alkyl ester (however, a hydroxyl group is bonded to the alkyl group of the methacrylic acid alkyl ester or acrylic acid alkyl ester). )
(C) Styrene The toner particles, sulfonic acid groups, of the yellow toner particles according to any one of claims 1 to 4, characterized in that it contains a polymer or copolymer having a sulfonic acid salt or sulfonic acid ester group Production method.

Images