Textile printing toner

Abstract

To provide a textile printing toner capable of forming a high-quality image by suppressing generation of a nitride oxide.SOLUTION: A textile printing toner contains: toner base particles containing at least styrene-acrylic resin, a sublimable dye, a release agent, and activated carbon; and an external additive to be added to the toner base particles, where the external additive contains an acid acceptor containing at least one of MgO, ZnO, and PbO, and degree of hydrophobicity of the acid acceptor is a value in a range of 2% or more and 20% or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a textile printing toner. [Background technology]

[0002] Patent Document 1 proposes a toner for developing electrostatic latent images that contains a binder resin, a colorant, and a release agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-154052 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned Patent Document 1 cannot suppress the generation of nitride oxides (NOx).

[0005] An object of the present disclosure is to provide a textile printing toner that can form high-quality images by suppressing the generation of nitride oxides (NOx). [Means for solving the problem]

[0006] A textile printing toner according to one embodiment of the present disclosure includes toner base particles containing at least a styrene acrylic resin, a sublimable dye, a release agent, and activated carbon, and an external additive to be added to the toner base particles, wherein the external additive includes an acid acceptor containing at least one of MgO, ZnO, and PbO, and the hydrophobicity of the acid acceptor is in the range of 2% or more and 20% or less. [Effects of the Invention]

[0007] According to the present disclosure, the textile printing toner exhibits the effect of suppressing the generation of nitride oxides (NOx) and forming high-quality images. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a flowchart illustrating an example of a method for producing a textile toner according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments and modifications of the present disclosure will be described. Note that the embodiments described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments. Various modifications other than these embodiments are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure.

[0010] (Textile toner) The textile printing toner according to an embodiment of the present disclosure is a toner used for dyeing a substrate such as a fabric by a sublimation transfer dyeing method. Examples of the sublimation transfer dyeing method include a sublimation transfer dyeing method using an inkjet system and a sublimation transfer dyeing method using an electrophotographic system. For example, in a sublimation transfer dyeing method using an electrophotographic system, a dry toner (textile printing toner) containing a sublimable dye is used to form an image on an intermediate recording medium such as transfer paper, and the intermediate recording medium and a substrate such as a fabric are then superimposed and heated to dye the substrate using the sublimation property of the dye.

[0011] However, when high-density images are continuously printed on fabrics or other substrates using the sublimation transfer dyeing method, a decrease in image resolution is observed. The cause of this decrease in image resolution is said to be that nitrogen compounds (NOx) generated during the charging process of the photoreceptor react with the charge transport materials (CTM) contained in the photoreceptor, causing them to absorb light of a different wavelength than in the initial state.

[0012] Therefore, the textile toner according to the embodiment of the present disclosure is configured so that the reaction product (nitrate) generated by reacting NOx generated in the charging process with an acid acceptor can be adsorbed onto activated carbon and removed from the photoreceptor surface together with the activated carbon. Note that even if the activated carbon that has adsorbed the reaction product removed from the photoreceptor surface remains on the intermediate recording medium, only the sublimable dye moves to the object to be dyed in the dyeing process, so the object to be dyed will not be stained by the activated carbon.

[0013] More specifically, the textile printing toner according to the embodiment of the present disclosure includes toner base particles containing at least a styrene acrylic resin, a sublimable dye, a release agent, and activated carbon, and an external additive added to the toner base particles. The external additive includes an acid acceptor containing at least one of MgO, ZnO, and PbO. The hydrophobicity of the acid acceptor is preferably 20% or less. In particular, the hydrophobicity of the acid acceptor is preferably in the range of 2% or more and 20% or less.

[0014] In the textile toner according to the embodiment of the present disclosure, an acid acceptor is contained in the external additive, so that the acid acceptor can react with NOx. Furthermore, because the toner base particles contain activated carbon, nitrate, which is a reaction product of the acid acceptor and NOx, can be adsorbed by the activated carbon and removed from the photoreceptor surface. Therefore, the textile toner can form high-quality images by suppressing the generation of NOx.

[0015] If the hydrophobicity of the acid acceptor is less than 2%, poor charging occurs on the photoreceptor, causing fogging. Conversely, if the hydrophobicity of the acid acceptor is more than 20%, the NOx capturing ability decreases, causing image blurring. Fogging is a phenomenon that indicates uniform, global contamination in the non-image areas of the intermediate recording medium (transfer paper).

[0016] Furthermore, in the textile printing toner of the present disclosure, in a configuration in which the external additive of the toner base particles contains an acid acceptor containing at least one of MgO, ZnO, and PbO as described above, by setting the ranges of values ​​that various parameters can take to be within the following ranges, it is possible to form images of higher quality.

[0017] The various parameters include the ratio of the amount of acid acceptor added to the toner base particles, the adhesion strength of the acid acceptor to the toner base particles, the average particle diameter (dispersion diameter) of the activated carbon dispersed in the toner base particles, and the ratio of the exposed area of ​​the activated carbon to the total surface area of ​​the toner base particles.

[0018] That is, the amount of the acid acceptor added to the toner base particles is preferably in the range of 0.5% by weight to 2.0% by weight, more preferably 0.7% by weight to 1.0% by weight, based on the total weight of the toner base particles.

[0019] If the amount of the acid acceptor added is less than 0.5% by weight, the progress of blurring of the printed image cannot be sufficiently suppressed, and if the amount of the acid acceptor added is more than 2.0% by weight, it will cause an increase in fogging.

[0020] The adhesion strength of the acid acceptor to the toner base particles is preferably in the range of 20% to 40%, and more preferably in the range of 25% to 30%.

[0021] The adhesion strength of the acid acceptor is expressed by the rate at which the acid acceptor attached to the toner base particles peels off from the toner base particles. Details of the adhesion strength of the acid acceptor will be described later.

[0022] If the adhesion strength of the acid acceptor is less than 20%, the amount of acid acceptor released from the toner base particles increases, and the acid acceptor accumulates in the developing tank, preventing it from reaching the photoreceptor surface. As a result, the acid acceptor cannot react sufficiently with NOx, and the progression of image blur cannot be fully suppressed. Also, if the adhesion strength of the acid acceptor is greater than 40%, the acid acceptor becomes embedded in the toner base particles of the printing toner, suppressing the adsorption of nitrates generated by the reaction between the acid acceptor and NOx onto the activated carbon. This causes an increase in fog.

[0023] The average particle size (dispersion size) of the activated carbon dispersed in the toner base particles is preferably in the range of 2 μm to 5 μm, and more preferably in the range of 3 μm to 4 μm.

[0024] If the dispersion diameter of the activated carbon is less than 2 μm, the activated carbon will be encapsulated in the binder resin (styrene acrylic resin) during the production of textile toner, and will barely be exposed from the toner base particles. As a result, the activated carbon will not be able to fully adsorb and recover the nitrate, and the progression of image blurring will not be suppressed. On the other hand, if the dispersion diameter of the activated carbon is greater than 5 μm, some activated carbon will become detached from the toner base particles, causing increased fogging.

[0025] At least a portion of the activated carbon is exposed on the surface of the toner base particle. The ratio of the exposed area of ​​the activated carbon to the total surface area of ​​the toner base particle is preferably in the range of 20% to 50%. It is even more preferably in the range of 25% to 30%. If the ratio of the exposed area of ​​the activated carbon is less than 20%, the activated carbon cannot adequately adsorb and recover the nitrate, and the progression of image blur cannot be adequately suppressed. Furthermore, if the activated carbon cannot recover the nitrate, this can cause filming. Filming refers to a state in which toner spreads thinly and adheres to the surface of the photosensitive drum.

[0026] On the other hand, if the ratio of the exposed area of ​​the activated carbon is greater than 50%, activated carbon will be liberated from the toner base particles, which will cause an increase in fogging.

[0027] Hereinafter, each component contained in the textile printing toner according to the embodiment of the present disclosure will be described in detail.

[0028] [Binder resin (styrene acrylic resin)] The textile printing toner according to the embodiment of the present disclosure can use a styrene-acrylic resin as a binder resin. The styrene-acrylic resin is not particularly limited, but examples thereof include resins obtained by polymerizing two types of monomers: a styrene-based monomer and a monofunctional (meth)acrylic monomer. Note that "(meth)acrylic" means "acrylic" and / or "methacrylic."

[0029] The styrene-based monomer is not particularly limited, but examples thereof include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, 4,α-dimethylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, 2,4,6-trimethylstyrene, pn-butylstyrene, p-tert-butylstyrene, pn-pentylstyrene, pn-hexylstyrene, pn-heptylstyrene, pn-octylstyrene, pn-nonylstyrene, pn-decanylstyrene, pn-dodecylstyrene, p-phenylstyrene, and 3,4-dicyclosilstyrene. Among these, styrene is preferred. These styrene-based monomers may be used alone or in combination.

[0030] The monofunctional (meth)acrylic monomer is not particularly limited, and examples thereof include acrylic monomers such as methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, n-octadecyl acrylate, methyl α-chloroacrylate, and ethyl α-chloroacrylate; and methacrylic monomers such as methacrylic acid, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-cyclohexyl methacrylate, n-dodecyl methacrylate, n-tridecyl methacrylate, and n-octadecyl methacrylate. Among these, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, and tert-butyl methacrylate are preferred, and n-butyl acrylate and n-butyl methacrylate are particularly preferred. These monofunctional (meth)acrylic monomers may be used alone or in combination of two or more.

[0031] [Coloring agent (sublimation dye)] The disperse dye used as the colorant is a dye suitable for sublimation transfer (sublimation dye). A dye suitable for sublimation transfer is one whose test result for staining (polyester) in the heat treatment test (method C) in "Testing Method for Color Fastness to Dry Heat Treatment [JIS L 0879:2005] (revised January 20, 2005, published by the Japanese Standards Association)" is usually grade 3-4 or lower, preferably grade 3 or lower. Among such dyes, known examples include the following dyes:

[0032] Examples of yellow dyes include CI Disperse Yellow 3, 7, 8, 23, 39, 51, 54, 60, 71, and 86; CI Solvent Yellow 114 and 163; and the like.

[0033] Orange dyes include CI Disperse Orange 1, 1:1, 5, 20, 25, 25:1, 33, 56, 76, and the like.

[0034] Examples of brown dyes include CI Disperse Brown 2;

[0035] Red dyes include CI Disperse Red 11, 50, 53, 55, 55:1, 59, 60, 65, 70, 75, 93, 146, 158, 190, 190:1, 207, 239, 240; CI Vat Red 41; and the like.

[0036] Violet dyes include CI Disperse Violet 8, 17, 23, 27, 28, 29, 36, 57, and the like.

[0037] Examples of blue dyes include CI Disperse Blue 19, 26, 26:1, 35, 55, 56, 58, 64, 64:1, 72, 72:1, 81, 81:1, 91, 95, 108, 131, 141, 145, 359, and 360; CI Solvent Blue 3, 63, 83, 105, and 111; and the like.

[0038] The above dyes may be used alone or in combination of two or more kinds.

[0039] It is also preferred to blend multiple dyes to obtain a hue that is completely different from the original dye, such as black. In this case, for example, a black dye can be obtained by blending a blue dye as the main dye with a yellow dye and a red dye as appropriate.

[0040] Furthermore, a plurality of dyes may be blended for the purpose of finely adjusting the color tone of, for example, blue, yellow, orange, red, violet, or black to a more preferred color tone, or for the purpose of obtaining an intermediate color.

[0041] [Release agent] The release agent may be any of the following waxes: petroleum waxes such as paraffin wax and derivatives of paraffin wax, hydrocarbon waxes such as polyethylene wax and derivatives of paraffin wax, carnauba wax, rice wax, and candelilla wax.

[0042] [Activated carbon] Activated carbon is a carbonaceous material with a large specific surface area and high adsorption capacity. It is an amorphous carbon consisting of a complex arrangement of graphite-like planar crystallites, with the exception of small amounts of hydrogen, oxygen, and inorganic components. Specifically, activated carbon can be activated by steam activation or chemical activation using wood or coal, such as charcoal, coconut shells, or sawdust. Since a portion of the activated carbon is exposed on the surface of the toner base particles, activated carbon produced by steam activation is preferred. An example of activated carbon is commercially available wood-based powdered activated carbon (PAC, 50% particle size (D50): 12 μm, manufactured by Futamura Chemical Co., Ltd.), which has been further pulverized. The amount of activated carbon incorporated into the toner base particles is preferably between 1% and 3% by mass. If the amount of activated carbon incorporated into the toner base particles is less than 1% by mass, the exposed surface area of ​​the activated carbon on the toner base particle surface becomes small, resulting in insufficient nitrate recovery. On the other hand, if the amount of activated carbon incorporated into the toner base particles is 3% by mass or more, activated carbon will be liberated from the toner base particles and accumulate in the developing tank.

[0043] [External additives] As the external additive, a material having functions such as improving powder fluidity, improving triboelectric charging property, improving heat resistance, long-term storage property, improving cleaning property, and controlling photoreceptor surface wear property in the textile printing toner may be used.

[0044] The external additive may be, for example, inorganic fine particles such as silica, titanium oxide, or alumina having an average particle size of 7 to 200 nm, and inorganic fine particles whose surfaces have been treated with a silane coupling agent, a titanium coupling agent, or silicone oil to impart hydrophobicity are preferred because they reduce the decrease in electrical resistance and charge amount under high humidity. Furthermore, the external additive is generally added by mixing the toner and the external additive in an airflow mixer such as a Henschel mixer.

[0045] The external additive also contains an acid acceptor. The acid acceptor particles constituting the acid acceptor are preferably metal oxides. They can be appropriately selected depending on the amount of NOx generated in the charging process. The metal oxide includes at least one of MgO, ZnO, and PbO. The particle diameter of the acid acceptor is preferably in the range of 40 nm or more and less than 500 nm. If the particle diameter of the acid acceptor is less than 40 nm, it will not function properly as an acid acceptor. On the other hand, if the particle diameter of the acid acceptor is 500 nm or more, the printing toner will aggregate via the acid acceptor, resulting in clumps of printing toner in the developing tank. This can lead to image defects such as streaks.

[0046] Examples of MgO include Starmag U, U-2, CX-150, M, M-2, L, P, C, CX, G, and L-10 (manufactured by Konoshima Chemical Co., Ltd.), with Starmag L being particularly preferred.

[0047] Examples of ZnO include trade names MZ-300 and MZ-500 (manufactured by Teika Corporation).

[0048] An example of PbO is Lisarge No. 1 Yellow (product name, manufactured by Nippon Chemical Industry Co., Ltd.).

[0049] As will be described in more detail later, the degree of hydrophobicity of the acid acceptor is in the range of 2% to 20%. In other words, the acid acceptor has not been subjected to hydrophobic treatment. This allows the acid acceptor to suppress a decrease in its NOx absorption capacity.

[0050] [Charge control agent] The textile printing toner may further contain a charge control agent, if necessary. As the charge control agent, charge control agents for controlling positive charge and negative charge that are commonly used in the art can be used.

[0051] Examples of charge control agents for positive charge control include nigrosine dyes, basic dyes, quaternary ammonium salts, quaternary phosphonium salts, aminopyrine, pyrimidine compounds, polynuclear polyamino compounds, aminosilanes, nigrosine dyes and derivatives thereof, triphenylmethane derivatives, guanidine salts, and amidine salts.

[0052] Examples of charge control agents for negative charge control include oil-soluble dyes such as oil black and Spiron black, metal-containing azo compounds, azo complex dyes, metal naphthenate salts, metal complexes and metal salts of salicylic acid and its derivatives (metals include chromium, zinc, zirconium, etc.), boron compounds, fatty acid soaps, long-chain alkyl carboxylate salts, and resin acid soaps.

[0053] In the textile printing toner, the above-mentioned charge control agents can be used alone or in combination of two or more.

[0054] The content of the charge control agent in the textile printing toner is not particularly limited, but is preferably 0.5 to 3.0 parts by weight, more preferably 1.0 to 2.0 parts by weight, relative to 100 parts by weight of the binder resin (styrene acrylic resin).

[0055] If the content of the charge control agent is within the above range, it is possible to form an image having a high image density and very good image quality without impairing various physical properties of the textile printing toner.

[0056] (Method for manufacturing textile toner) The method for producing a textile toner will be described below with reference to Fig. 1. Fig. 1 is a flowchart showing an example of the method for producing a textile toner according to an embodiment of the present disclosure.

[0057] As shown in FIG. 1, the method for producing a textile toner according to an embodiment of the present disclosure includes a mixing step (step S11), a pulverizing step (step S12), a classification step (step S13), and an external addition step (step S14).

[0058] [Mixing process] In the mixing process shown in step S11, toner materials including at least a binder resin (styrene acrylic resin), a sublimable dye, a release agent, and activated carbon are mixed, melted, and kneaded, and then further mixed with a filler. The resulting kneaded product is then cooled, solidified, and coarsely pulverized to obtain a mixture.

[0059] Dry mixing is preferred, and the mixer may be a known device commonly used in the technical field, such as a Henschel-type mixer such as Henschel Mixer (trade name, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke and Engineering Co., Ltd.)), Super Mixer (trade name, manufactured by Kawata Corporation), or Mechano Mill (trade name, manufactured by Okada Seiko Co., Ltd.), as well as Ang Mill (trade name, manufactured by Hosokawa Micron Corporation), Hybridization System (trade name, manufactured by Nara Machinery Works, Ltd.), or Cosmo System (trade name, manufactured by Kawasaki Heavy Industries, Ltd.).

[0060] The kneader may be a known device commonly used in the technical field, such as a twin-screw extruder, a three-roll mill, a lab blast mill, etc. Specific examples include single- or twin-screw extruders such as TEM-100B (trade name, manufactured by Toshiba Machine Co., Ltd.), PCM-65 / 87, and PCM-30 (all trade names, manufactured by Ikegai Corporation), and open-roll kneaders such as Kneadex (trade name, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke and Engineering Co., Ltd.)). Among these, open-roll kneaders are preferred because they have a strong shear force during kneading and can highly disperse colorants such as pigments.

[0061] [Crushing process] In the fine pulverization step shown in step S12, the kneaded material obtained in the mixing step shown in step S11 is coarsely pulverized and then finely pulverized.

[0062] As the mill for carrying out the fine grinding, any known device commonly used in the relevant technical field can be used, such as a jet mill that uses a supersonic jet stream to grind the material, or an impact mill that introduces a solidified material into the space formed between a rotor and a stator (liner) that rotate at high speed and grinds the material.

[0063] [Classification process] In the classification step shown in step S13, the finely pulverized product obtained in the finely pulverized product shown in step S12 is classified. For classification, a known device commonly used in the technical field, in particular a classifier that can remove over-pulverized toner particles by centrifugal force and wind force, such as a gyratory wind classifier (rotary wind classifier), can be used.

[0064] [External addition process] In the external addition step shown in step S14, the toner base particles obtained in the classification step are mixed with external additives to externally add the external additives to the toner base particles, thereby obtaining a textile printing toner.

[0065] As the mixer, a known device commonly used in the art can be used, and examples thereof include the mixers exemplified in the mixing step of step S11.

[0066] (Example) Examples of the textile printing toner according to the embodiment of the present disclosure will be described below, but the textile printing toner is not limited to these examples.

[0067] (Methods for measuring various parameters) First, the methods for measuring various parameters of the textile printing toners according to Examples 1 to 19 and Comparative Examples 1 to 4 will be described.

[0068] [Calculation method for the hydrophobicity of acid acceptors] The hydrophobicity of the acid acceptor was determined by the following method. More specifically, 50 ml of pure water was placed in a 200 ml beaker, and 0.2 g of acid acceptor was added. The solution was stirred with a magnetic stirrer. The tip of a buret containing methanol was then placed in the solution, and methanol was added dropwise while stirring, dispersing the hydrophobic silica in the solution. Here, when the amount of methanol added until the hydrophobic silica was completely dispersed in the solution was Y ml, the hydrophobicity was determined by the following mathematical formula (1). Hydrophobicity = {Y / (50+Y)} × 100 (%) (1)

[0069] [Adhesion strength of acid acceptor] The adhesion strength of the acid acceptor was defined as a value indicating the proportion of the acid acceptor remaining in the textile printing toner after ultrasonic treatment. Specifically, 3.0 g of textile printing toner was treated with 60 ml of a 0.2% by mass aqueous solution of nonionic surfactant using an ultrasonic treatment device (manufactured by Nippon Seiki Seisakusho Co., Ltd., model: US-300T) at 240 W for 4 minutes. The resulting treated product was then left to stand for 3 hours, after which the supernatant was removed, washed with ion-exchanged water, and filtered with suction to remove the surfactant. The amount of metal (Mg, Zn, or Pb) in the acid acceptor was quantified using a fluorescent X-ray analyzer (manufactured by Rigaku Corporation, model: ZX-Primus II). The amount of the acid acceptor was converted to the amount of acid acceptor in the textile printing toner before treatment, and the proportion (mass %) of the acid acceptor was calculated. This proportion was used as the adhesion strength.

[0070] [Method for measuring the dispersion diameter of activated carbon] The dispersion diameter of the activated carbon was measured using the following measurement method. More specifically, each of the multiple textile printing toners was embedded in a photocurable resin, and then ultrathin sections with a thickness of 100 nm were prepared using an ultrasonic ultramicrotome (Leica EM UC7, manufactured by Leica) at an acceleration voltage of 200 kV. Next, cross-sectional images of the ultrathin sections were taken at a magnification of 10,000 times using an electron microscope (SEM). 100 toner base particles were then picked up from the cross-sectional images. Each activated carbon particle observed in each of the 100 toner base particles was randomly measured as a primary particle, and the Feret diameter in the horizontal direction was calculated using image analysis. The average Feret diameter was then calculated, and this average was used as the dispersion diameter of the activated carbon.

[0071] [Method for calculating the exposed area ratio of activated carbon in toner base particles] The exposed area ratio of activated carbon in the toner base particle was determined by the following method: Among the toner base particles photographed by SEM in the above-mentioned [Method for measuring the dispersion diameter of activated carbon], 10 randomly selected toner base particles were analyzed using image analysis software ("WinROOF" manufactured by Mitani Corporation) to measure the exposed area ratio of the activated carbon domain.

[0072] More specifically, in a cross-sectional image of a toner base particle, the ratio of the area where the activated carbon domains were exposed (the ratio of the exposed area of ​​the activated carbon domains) to the surface area of ​​the toner core (the outline showing the outer edge) was measured, and the ratio of the exposed area of ​​the activated carbon domains was calculated using the following formula (2). Exposed area ratio of activated carbon domain=(total length of the area where activated carbon domain is exposed on the surface of the toner core) / (perimeter of the toner core)×100(%) (2)

[0073] Example 1 A method for producing the textile printing toner according to the first embodiment will be described below.

[0074] [Production of toner base particles] First, a more detailed description will be given of the production of the toner base particles of the textile printing toner according to Example 1. The following toner materials were used to produce the toner base particles (toner cores). Binder resin: styrene acrylic resin (product name: CPR-190, manufactured by Mitsui Chemicals, Inc.) 80.0% by mass Sublimation dye: Disperse Yellow 54 (product name: Plast Yellow 8040, Arimoto Chemical Industry Co., Ltd.) 3.0% by mass Disperse Red 60 (product name: Plast Red 8375-N, Arimoto Chemical Industry Co., Ltd.) 5.0% by mass :Diperse Blue 56 Product name: KP Plast Blue BG, Kiwa Chemical Industry Co., Ltd.) 5.0% by mass Activated carbon: Wood-based powdered activated carbon (PCP, manufactured by Futamura Chemical Co., Ltd.) 2.0% by mass Charge control agent: salicylic acid compound (trade name: Bontron E-84, Orient Chemical Industries Co., Ltd.) 1.0% by mass Release agent: polyethylene wax (product name: Hiwax 320P, manufactured by Mitsui Chemicals, Inc.) 4.0% by mass

[0075] The above materials were premixed for 5 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke and Engineering Co., Ltd.), model FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model PCM-30) under conditions of a cylinder setting temperature of 110°C, a barrel rotation speed of 200 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step).

[0076] The resulting molten kneaded product was cooled in a drum flaker and then coarsely pulverized using a cutting mill (manufactured by Orient Co., Ltd., model VM-16) to obtain a coarsely pulverized product (pulverization step (coarse pulverization)). The coarsely pulverized product was then finely pulverized using a jet pulverizer (manufactured by Nippon Pneumatic Mfg. Co., Ltd., model IDS-2) to obtain a finely pulverized product (pulverization step (fine pulverization)).

[0077] The resulting finely pulverized product was classified using an elbow jet classifier (manufactured by Nittetsu Mining Co., Ltd., model: EJ-LABO) to obtain toner base particles having an average primary particle diameter of 6.5 μm (classification step).

[0078] [External addition of external additives] External additives were added to the toner base particles obtained in the above classification step as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0079] Example 2 A description will be given of a method for producing the textile toner according to Example 2. Note that the [production of toner base particles] of the textile toner according to Example 2 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0080] [External addition of external additives] In Example 2, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0081] Example 3 A description will be given of a method for producing the textile toner according to Example 3. Note that the [production of toner base particles] of the textile toner according to Example 3 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0082] [External addition of external additives] In Example 3, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of lead oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0083] Example 4 A method for producing a textile toner according to Example 4 will be described. First, the [production of toner base particles] of the textile toner according to Example 4 will be described. The [production of toner base particles] of Example 4 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0084] That is, the materials used in Example 1 were pre-mixed for 8 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 110°C, a barrel rotation speed of 250 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0085] [External addition of external additives] In Example 4, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0086] Example 5 A method for producing a textile toner according to Example 5 will be described. First, the [production of toner base particles] of the textile toner according to Example 5 will be described. The [production of toner base particles] of Example 5 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0087] That is, the materials used in Example 1 were pre-mixed for 6 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 110°C, a barrel rotation speed of 230 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0088] [External addition of external additives] In Example 5, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0089] Example 6 A method for producing a textile toner according to Example 6 will be described. First, the [production of toner base particles] of the textile toner according to Example 6 will be described. The [production of toner base particles] of Example 6 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0090] That is, the materials used in Example 1 were pre-mixed for 3 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 110°C, a barrel rotation speed of 180 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0091] [External addition of external additives] In Example 6, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0092] Example 7 A method for producing a textile toner according to Example 7 will be described. First, the [production of toner base particles] of the textile toner according to Example 7 will be described. The [production of toner base particles] of Example 7 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0093] That is, the materials used in Example 1 were pre-mixed for 1 minute using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 110°C, a barrel rotation speed of 160 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, similar to Example 1, toner base particles were obtained through the pulverization step and classification step.

[0094] [External addition of external additives] In Example 7, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0095] Example 8 A method for producing a textile toner according to Example 8 will be described. First, the [production of toner base particles] of the textile toner according to Example 8 will be described. The [production of toner base particles] of Example 8 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0096] That is, the materials used in Example 1 were pre-mixed for 5 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 95°C, a barrel rotation speed of 200 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing process). Then, toner base particles were obtained through the pulverization process and classification process in the same manner as in Example 1.

[0097] [External addition of external additives] In Example 8, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of lead oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0098] Example 9 A method for producing a textile toner according to Example 9 will be described. First, the [production of toner base particles] of the textile toner according to Example 9 will be described. The [production of toner base particles] of Example 9 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0099] That is, the materials used in Example 1 were pre-mixed for 5 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 100°C, a barrel rotation speed of 200 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0100] [External addition of external additives] In Example 9, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0101] Example 10 A method for producing a textile toner according to Example 10 will be described. First, the [production of toner base particles] of the textile toner according to Example 10 will be described. The [production of toner base particles] of Example 5 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0102] That is, the materials used in Example 1 were pre-mixed for 5 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 120°C, a barrel rotation speed of 200 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0103] [External addition of external additives] In Example 10, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, and the mixture was stirred and mixed for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0104] Example 11 A method for producing a textile toner according to Example 11 will be described. First, the [production of toner base particles] of the textile toner according to Example 11 will be described. The [production of toner base particles] of Example 11 differs from the [production of toner base particles] of Example 1 only in the "mixing step" as follows. Since the other points are the same, the description thereof will be omitted.

[0105] That is, the materials used in Example 1 were pre-mixed for 5 minutes using an air flow mixer (Henschel mixer, manufactured by Mitsui Mining Co., Ltd. (now Nippon Coke & Engineering Co., Ltd.), model: FM20C), and then melt-kneaded using a twin-screw extruder (manufactured by Ikegai Co., Ltd., model: PCM-30) under conditions of a cylinder setting temperature of 130°C, a barrel rotation speed of 200 rpm, and a raw material supply rate of 15 kg / hour to obtain a melt-kneaded product (mixing step). Then, toner base particles were obtained through the pulverization step and classification step in the same manner as in Example 1.

[0106] [External addition of external additives] In Example 11, external additives were added to the toner base particles obtained by the above production process as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of lead oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0107] Example 12 A description will be given of a method for producing the textile toner according to Example 12. Note that the [production of toner base particles] of the textile toner according to Example 12 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0108] [External addition of external additives] In Example 12, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.4 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0109] Example 13 A description will be given of a method for producing the textile toner according to Example 13. Note that the [production of toner base particles] of the textile toner according to Example 13 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0110] [External addition of external additives] In Example 13, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.5 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0111] Example 14 A description will be given of a method for producing the textile toner according to Example 14. Note that the [production of toner base particles] of the textile toner according to Example 14 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0112] [External addition of external additives] In Example 14, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 2.0 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0113] Example 15 A description will be given of a method for producing the textile toner according to Example 15. Note that the [production of toner base particles] of the textile toner according to Example 15 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0114] [External addition of external additives] In Example 15, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 2.2 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0115] Example 16 A description will be given of a method for producing the textile toner according to Example 16. Note that the [production of toner base particles] of the textile toner according to Example 16 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0116] [External addition of external additives] In Example 16, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 25 m / sec, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0117] Example 17 A description will be given of a method for producing the textile toner according to Example 17. Note that the [production of toner base particles] of the textile toner according to Example 17 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0118] [External addition of external additives] In Example 17, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 30 m / sec, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0119] Example 18 A description will be given of a method for producing the textile toner according to Example 18. Note that the [production of toner base particles] of the textile toner according to Example 18 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0120] [External addition of external additives] In Example 18, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 50 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0121] Example 19 A description will be given of a method for producing the textile toner according to Example 19. Note that the [production of toner base particles] of the textile toner according to Example 19 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0122] [External addition of external additives] In Example 19, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Femed Silica R976S), and 0.8 parts by mass of lead oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 60 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0123] (Comparative Example 1) A description will be given of a method for producing a textile toner according to Comparative Example 1. Note that the [production of toner base particles] of the textile toner according to Comparative Example 1 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0124] [External addition of external additives] In Comparative Example 1, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 1.5 parts by mass of magnesium oxide powder were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / sec, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0125] (Comparative Example 2) A description will be given of a method for producing a printing toner according to Comparative Example 2. Note that the [production of toner base particles] of the printing toner according to Comparative Example 2 is the same as that of the printing toner according to Example 1, and therefore the description thereof will be omitted.

[0126] [External addition of external additives] In Comparative Example 2, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of lead oxide powder surface-treated with a silane coupling agent were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / s, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0127] (Comparative Example 3) A description will be given of a method for producing a printing toner according to Comparative Example 3. Note that the [production of toner base particles] of the printing toner according to Comparative Example 3 is the same as that of the printing toner according to Example 1, and therefore the description thereof will be omitted.

[0128] [External addition of external additives] In Comparative Example 3, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles and 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S) were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 40 m / sec, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0129] Comparative Example 4 A description will be given of a method for producing the textile toner according to Comparative Example 4. Note that the [production of toner base particles] of the textile toner according to Comparative Example 4 is the same as that of the textile toner according to Example 1, and therefore the description thereof will be omitted.

[0130] [External addition of external additives] In Comparative Example 4, external additives were added to the toner base particles produced in Example 1 as follows: 100 parts by mass of unadded toner base particles, 1.0 part by mass of hydrophobic silica fine particles (average primary particle diameter 7 nm, manufactured by Nippon Aerosil Co., Ltd., product name: Fame Silica R976S), and 0.8 parts by mass of zinc oxide powder surface-treated with a silane coupling agent were charged into a Henschel mixer, and the peripheral speed at the outermost periphery of the stirring blade tip was set to 25 m / sec, followed by stirring and mixing for 1 minute to obtain approximately 2,000 g of textile printing toner (volume average particle diameter 6.5 μm, coefficient of variation 24%) (external addition step).

[0131] (evaluation) The images printed using the textile toners according to Examples 1 to 19 and the textile toners according to Comparative Examples 1 to 4 were evaluated as follows. Specifically, the first evaluation item was image blur, the second evaluation item was fogging, and the third evaluation item was filming. The evaluation results for each of the first to third evaluation items are shown in Table 1.

[0132] (First evaluation item: Evaluation of image blur) The textile toner was filled into a commercially available copier (product name: MX-5111FN, manufactured by Sharp Corporation) equipped with a developing device, and a predetermined print pattern with a print rate of 1% was continuously printed in a HH environment (temperature 28°C, humidity 80%).

[0133] After printing 5,000 sheets continuously, the absorption spectrum of the photoconductor (CTM) was measured. The degree of image blur was evaluated by calculating the absorbance of 500 nm light using the following formula (3). Note that absorbance (After) indicates the absorbance of the photoconductor after printing, and absorbance (Before) indicates the absorbance of the photoconductor before printing. (Absorbance (After) - Absorbance (Before)) / Absorbance (Before) (3)

[0134] The evaluation results for the first evaluation item were evaluated on a four-point scale using the following symbols (◎, 〇, △, ×) in [Table 1]. "◎" indicates the highest evaluation, and "×" indicates the lowest evaluation. The evaluations decrease in order from "◎" to "〇", "△", and "×". ◎: The increase in absorbance is 50% or less. Good: The increase in absorbance is more than 50% and not more than 80%. △: The increase rate of absorbance is more than 80% and 100% or less. ×: The increase in absorbance is more than 100%.

[0135] (Second evaluation item: evaluation of fogging) Using a whiteness meter (product name: ZE6000, manufactured by Nippon Denshoku Industries Co., Ltd.), the difference between the whiteness of the paper before printing and the whiteness of the non-image area of ​​the paper after printing was measured, and fogging was evaluated according to the following criteria.

[0136] The evaluation results for the second evaluation item were evaluated on a four-point scale using the following symbols (◎, 〇, △, ×) in [Table 1]. "◎" indicates the highest evaluation and "×" indicates the lowest evaluation. The evaluations decrease in order from "◎" to "〇", "△", and "×". ⊚: The difference in whiteness is 0.5 or less. Good: The difference in whiteness is greater than 0.5 and not more than 1.0. △: The difference in whiteness is more than 1.0 and 1.5 or less. ×: The difference in whiteness exceeds 1.5.

[0137] (Third evaluation item: Filming evaluation) A commercially available copier (product name: MX-5111FN, manufactured by Sharp Corporation) equipped with a developing device was filled with the textile toner, and a predetermined print pattern with a print rate of 1% was continuously printed in a HH environment (temperature 28°C, humidity 80%). After continuously printing 5,000 sheets, the photoreceptor and solid images were visually observed and evaluated. The evaluation criteria are as follows, and the evaluation results for the third evaluation item were evaluated on a three-level scale using the following symbols (o, △, ×) in [Table 1]. "o" indicates the highest evaluation, and "×" indicates the lowest evaluation. "△" indicates an intermediate evaluation between "o" and "×". ◯: No filming occurs on the photosensitive member, and there is no problem at all. △: Some filming occurs on the photosensitive member, but the image is fine. ×: A lot of filming occurs on the photosensitive member, and there are problems with the image.

[0138] (Evaluation results) As shown in Table 1, Examples 1 to 19, in which the hydrophobicity of the acid acceptor is in the range of 2% or more and 20% or less, were not rated "x" in any of the first evaluation item (image blur), second evaluation item (fogging), and third evaluation item (filming), and were rated "good." On the other hand, Comparative Example 1, in which the hydrophobicity of the acid acceptor is less than 2%, and Comparative Examples 2 and 4, in which the hydrophobicity is greater than 20%, were rated "x" in at least one of the first to third evaluation items. Furthermore, Comparative Example 3, in which no acid acceptor is included in the external additive, was also rated "x" in both the first and second evaluation items.

[0139] From the above, it was found that by incorporating an acid acceptor into the external additive and setting the hydrophobicity of this acid acceptor to a value in the range of 2% or more and 20% or less, the textile printing toner can form high-quality images.

[0140] Furthermore, in Examples 1 to 19, the relationships between the various parameters and the first to third evaluation items were investigated.

[0141] First, among Examples 1 to 19, Examples 4 and 7 were examples in which the dispersion diameter of activated carbon in the toner base particles was in the range of less than 2 μm and more than 5 μm.

[0142] From Table 1, Example 4 achieved a result of "△:98" for the first evaluation item (image blur) and a result of "△" for the third evaluation item (filming). Example 7 achieved a result of "△:1.49" for the second evaluation item (fogging) and a result of "△" for the third evaluation item (filming).

[0143] From the above results, it was found that in Examples where the dispersion diameter of activated carbon in the toner base particles is outside the range of 2 μm or more and 5 μm or less, the evaluation result for at least one of the first to third evaluation items is "△", and the evaluation is lower than the Example that received the best evaluation. Therefore, it is preferable that the dispersion diameter of activated carbon in the toner base particles is within the range of 2 μm or more and 5 μm or less.

[0144] Next, among Examples 1 to 19, Examples 8 and 11 were examples in which the ratio of the exposed area of ​​activated carbon to the total surface area of ​​the toner base particles was less than 20% and more than 50%.

[0145] As can be seen from Table 1, Example 8 achieved a result of "△:99" for the first evaluation item (image blur). Also, the result of the third evaluation item (filming) was "△". Example 11 achieved a result of "△:84" for the first evaluation item (image blur) and "△:1.41" for the second evaluation item (fog).

[0146] From the above results, it was found that in Examples where the ratio of the exposed area of ​​activated carbon to the entire surface area of ​​the toner base particle is outside the range of 20% to 50%, the evaluation result for at least one of the first to third evaluation items is "△", and the evaluation is lower than the Example that received the best evaluation. Therefore, it is preferable that the ratio of the exposed area of ​​activated carbon to the entire surface area of ​​the toner base particle is within the range of 20% to 50%.

[0147] Next, among Examples 1 to 19, Examples 12 and 15 were the examples in which the ratio of the amount of acid acceptor added to the toner base particles was less than 0.5% by weight and greater than 2.0% by weight relative to the total weight of the toner base particles.

[0148] As can be seen from Table 1, Example 12 achieved a result of "△: 98" for the first evaluation item (image blur). Example 15 achieved a result of "△: 1.47" for the second evaluation item (fog) and a result of "△" for the third evaluation item (filming).

[0149] From the above results, it was found that if the ratio of the amount of acid acceptor added to the toner base particles is outside the range of 0.5% by weight or more and 2.0% by weight or less relative to the total weight of the toner base particles, the evaluation result for at least one of the first to third evaluation items will be "△", and the evaluation will be lower than that of the example which received the best evaluation. Therefore, it is preferable that the ratio of the amount of acid acceptor added to the toner base particles be within the range of 0.5% by weight or more and 2.0% by weight or less relative to the total weight of the toner base particles.

[0150] Next, among Examples 1 to 19, Examples 16 and 19 were examples in which the adhesion strength of the acid acceptor to the toner base particles was less than 20% and more than 40%.

[0151] As can be seen from Table 1, Example 16 achieved a score of "△:92" for the first evaluation item (image blur) and a score of "△" for the third evaluation item (filming). Example 19 achieved a score of "△:1.48" for the second evaluation item (fog).

[0152] From the above results, it was found that if the adhesion strength of the acid acceptor to the toner base particles is outside the range of 20% to 40%, the evaluation result for at least one of the first to third evaluation items will be "△", which is lower than the best evaluation example. Therefore, it is preferable that the adhesion strength of the acid acceptor to the toner base particles be within the range of 20% to 40%.

[0153] As can be seen from Table 1, Example 1 was the example that received good evaluations for all of the first to third evaluation items (first evaluation item: ◎, second evaluation item: ◎, third evaluation item: ◯).

[0154] The textile printing toner according to Example 1 contains an acid acceptor as an external additive, and the hydrophobicity of the acid acceptor is in the range of 2% or more and 20% or less.

[0155] The dispersion diameter of the activated carbon in the toner base particles is a value in the range of 2 μm or more and 5 μm or less. At least a portion of the activated carbon is exposed on the surface of the toner base particles, and the ratio of the exposed area of ​​the activated carbon to the total surface area of ​​the toner base particles is a value in the range of 20% or more and less than 50%. Furthermore, the amount of acid acceptor added to the toner base particles is a value in the range of 0.5% by weight or more and 2.0% by weight or less relative to the total weight of the toner base particles. The adhesion strength of the acid acceptor to the toner base particles is a value in the range of 20% or more and 40% or less.

[0156] [Table 1]

Claims

1. toner base particles containing at least a styrene acrylic resin, a sublimable dye, a release agent, and activated carbon; an external additive to be added to the toner base particles, the external additive includes an acid acceptor including at least one of MgO, ZnO, and PbO; the hydrophobicity of the acid acceptor is in the range of 2% or more and 20% or less; Textile printing toner.

2. the dispersion diameter of the activated carbon in the toner base particles is in the range of 2 μm or more and 5 μm or less; The textile printing toner according to claim 1 .

3. at least a portion of the activated carbon is exposed on the surface of the toner base particle; the ratio of the exposed area of ​​the activated carbon to the total surface area of ​​the toner base particles is in the range of 20% to 50%. The textile printing toner according to claim 1 .

4. the ratio of the amount of the acid acceptor added to the toner base particles is in the range of 0.5% by weight or more and 2.0% by weight or less with respect to the total weight of the toner base particles; The textile printing toner according to claim 1 .

5. the adhesion strength of the acid acceptor to the toner base particles is in the range of 20% or more and 40% or less; The textile printing toner according to claim 1 .

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