550results about "Developers" patented technology

Provided is a toner that includes a toner particle containing a binder resin; and an external additive, wherein the binder resin contains a polyester resin A; when a content of the polyester resin A in the binder resin is taken as Wp (mass %), Wp is 50 mass % or more; when a content ratio of the monomer unit Uiso corresponding to isophthalic acid to all monomer units corresponding to polycarboxylic acids in the polyester resin A is taken as MIPA (mol %), MIPA is 40 mol % or more; the external additive contains inorganic fine powder; and the inorganic fine powder contains a silica fine particle having aluminum hydroxide on the surface thereof.

An image forming apparatus may include a holding container that holds a toner containing an antibacterial agent, and an image forming unit that forms an antibacterial region by applying the toner supplied from the holding container to a recording material by performing an image forming process. The antibacterial region is formed on a partial region that is a partial region of a first surface of the recording material and that is likely to be touched by a user's finger

An image forming apparatus includes: a forming unit configured to form an image on a sheet by forming a plurality of toner images using a plurality of types of toner, and transfer the plurality of toner images onto the sheet, or transfer the plurality of toner images onto the sheet via an intermediate transfer member; and a controller configured to control the forming unit to form a formed image and an antimicrobial pattern on the sheet based on first image data representing the formed image, wherein at least one first toner out of the plurality of types of toner is antimicrobial toner that includes an antimicrobial agent, at least one second toner out of the plurality of types of toner is non-antimicrobial toner that does not contain the antimicrobial agent, and the antimicrobial pattern is formed using the first toner.

A toner including: a toner particle; and an inorganic fine particle, wherein the inorganic fine particle contains a strontium titanate fine particle, a Si-containing protrusion portion is present at a surface of the strontium titanate fine particle, and the toner contains an amorphous polyester resin and an aluminum element at a surface of the toner particle.

A toner comprising a toner particle comprising a colorant, a binder resin, and calcium carbonate particles, wherein an amount of the colorant in the toner particle is from 1.0 to 20.0% by mass; the binder resin comprises a polyester resin; the polyester resin has an aromatic ring concentration of from 50 to 70 mol %; a surface of the calcium carbonate particles is coated with a fatty acid; an amount of the calcium carbonate particles in the toner particle is from 1.0 to 15.0% by mass; a number average particle diameter of the calcium carbonate particles is from 150 nm to 800 nm.

A toner including: a toner particle containing a binder resin; and an inorganic fine particle, wherein the inorganic fine particle contains a strontium titanate fine particle A, a silica fine particle B, and a hydrotalcite particle C, Si is present at a surface of the strontium titanate fine particle A, and a value Si / Sr of a mass ratio of Si to Sr, which is detected in a fluorescent X-ray analysis of the strontium titanate fine particle A, satisfies the following formula (1); 0.20≤Si / Sr≤0.60 . . . (1).

To provide a toner that achieves both low-temperature fixation and storage stability in high-temperature environments. [Solution] A toner containing a graft polymer resin including a polyolefin resin and a styrene-based resin, a polyester resin, and a release agent, wherein when the toner heated to 50°C is measured by FTIR-ATR (total internal reflection absorption infrared spectroscopy), the peak intensity derived from the release agent is set to Wk-50 and the peak intensity derived from the polyester resin is set to RK-50; when the toner heated to 70°C is measured by FTIR-ATR, the peak intensity derived from the release agent is set to Wk-70 and the peak intensity derived from the polyester resin is set to RK-70; and when the toner heated to 90°C is measured by FTIR-ATR, the peak intensity derived from the release agent is set to Wk-90 and the peak intensity derived from the polyester resin is set to RK-90, the toner satisfies the following formulas (1) and (2). (Wk-70 / RK-70) / (Wk-50 / RK-50)≦1.1···(1) 1.5≦(Wk-90 / RK-90) / (Wk-50 / RK-50) (2)

The present invention provides a toner containing colored resin particles of a binder resin and a colorant and an external additive, the binder resin containing a carboxyl group-containing acrylate resin, and the external additive containing carboxyl group-containing acrylate polymer modified metal particles, and a method for preparing the same. By using the specific external additive and the adhesive resin, the prepared toner can still keep stable triboelectrification performance in a high-humidity environment, so that the problems of uneven image concentration and increase of bottom ash are avoided. In addition, the toner has good residual accumulation resistance, residual accumulation on the toner cartridge is reduced, the printing quality is improved, stable printing is still achieved in the high-speed printing process, and good image quality is obtained.

This invention relates to a method for manufacturing a dry-process toner that can achieve both glossiness and resistance to hot offset. [Solution] A method for producing a dry-process toner containing amorphous polyester resin A, wherein the amorphous polyester resin A is a polycondensate of an alcohol component, a carboxylic acid component, and polyethylene terephthalate, and the method comprises the steps of: melt-kneading a mixture containing the amorphous polyester resin A using an open-roll twin-screw kneader; crushing and classifying the resulting kneaded material to obtain toner matrix particles; and mixing the obtained toner matrix particles with an external additive.

To provide a toner that has excellent fixability, can be charged to a desired charge amount even when images are continuously formed in various environments such as a normal-temperature and normal-humidity environment, a high-temperature and high-humidity environment, and a low-temperature and low-humidity environment, and can form an image with little fogging and a desired density.SOLUTION: The toner includes toner particles. The toner particles each include a toner core. The toner cores contain a binder resin, a black colorant, and carbon nanotubes. The toner cores have a carbon nanotube content of at least 0.10% by mass and no greater than 1.00% by mass.SELECTED DRAWING: Figure 1

A toner comprising a toner particle comprising a binder resin, a crystalline material, and a silica particle, wherein a number average particle diameter D1 of the silica particle comprised in the toner particle is 400 to 3000 nm; the silica particle has a pointed portion; and the crystalline material comprises a compound having an ester group.

To provide a toner that is excellent in low temperature fixability and is excellent in durability in a high temperature and high humidity severe environment, and a method for manufacturing toner.SOLUTION: A toner has toner particles containing a binder resin, wax, and inorganic oxide particles, and an external additive. The inorganic oxide particle includes, as a main component, an oxide of at least one element selected from the group consisting of Si, Mg, Al, Ti, Sr. When a thin layer obtained by cutting the toner by a microtome is observed by a transmission electron microscope (TEM), the major axis A of the inorganic oxide particle is 0.10-3.00 μm. In a test of wettability of the toner for a methanol / water mixture solvent, the concentration of methanol when the permeability of light with a wavelength of 780 nm is 50% is 5.0-30.0 volume%.SELECTED DRAWING: None

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

To provide toner for electrostatic charge image development including pigments having favorable color developability and having image scratch resistance, and manufacturing method of the toner.SOLUTION: Toner for electrostatic charge image development includes a binder resin, ester compositions (E) and a colorant. The ester compositions (E) are one or more types selected from: an ester composition (E1) containing a condensate of a carboxylic acid component (E1-ac) containing an aliphatic monocarboxylic acid compound with 10 or more and 30 or less carbon atoms, and an alcohol component (E1-al) containing a dihydric or higher aliphatic alcohol with 2 or more and 14 or less carbon atoms; and an ester composition (E2) containing a condensate of an alcohol component (E2-al) containing an aliphatic monoalcohol with 10 or more and 30 or less carbon atoms, and a carboxylic acid component (E2-ac) containing divalent or higher aliphatic carboxylic acid compound with 2 or more and 14 or less carbon atoms, where a sum of the acid value and hydroxyl value of the ester compositions (E) is 70 mgKOH / g or more and 400 mgKOH or less. A manufacturing method of the toner for electrostatic charge image development is also provided.SELECTED DRAWING: None

An electrostatic image developing toner and a method for producing the toner, the electrostatic image developing toner containing a colorant, a resin composition (P) and an ester composition (C), the resin composition (P) being a resin composition obtained by condensing an amorphous polyester-based resin (A) having an acid group with an amine compound, the ester composition (C) being one or more selected from the following ester compositions (CI) and (CII). The ester composition (CI): an ester composition containing a condensate of a carboxylic acid component (CI-ac) containing 20 mol% or more of an aliphatic monobasic carboxylic acid compound having 10 to 30 carbon atoms and an alcohol component (CI-al) containing 90 mol% or more of an aliphatic alcohol having 2 or more valences having 2 to 14 carbon atoms; the ester composition (CII): an ester composition containing a condensate of an alcohol component (CII-al) containing 20 mol% or more of an aliphatic monohydric alcohol having 10 to 30 carbon atoms and a carboxylic acid component (CII-ac) containing 90 mol% or more of an aliphatic carboxylic acid compound having 2 or more valences having 2 to 14 carbon atoms.

An image forming apparatus is characterized by that a region of the surface of an image bearing member in which a second potential difference that generates an electrostatic force such that developer which is charged to an opposite polarity to the normal charging polarity of the developer moves from the image bearing member to a developer bearing member was generated in a second operation that moves the developer from the surface of the image bearing member to the developer bearing member includes a region where a first potential difference that generates an electrostatic force such that the developer which is charged to an opposite polarity to the normal charging polarity of the developer moves from the charging member to the image bearing member was generated in a first operation that moves the developer from the surface of the charging member to the surface of the image bearing member.

A toner comprising a toner particle comprising a binder resin, a fatty acid metal salt particle on a surface of the toner particle, and a hydrotalcite particle on a surface of the toner particle, wherein the hydrotalcite particle comprises fluorine, the fluorine is present inside the hydrotalcite particle in line analysis of STEM-EDS mapping analysis of the toner, and when an area ratio of the fatty acid metal salt particle to the toner particle in an EDS measurement field, which is measured through the STEM-EDS mapping analysis of the toner, is defined as S1(%) and an area ratio of the hydrotalcite particle to the toner particle in the EDS measurement field, which is measured through the STEM-EDS mapping analysis of the toner, is defined as H1(%),S1 / H1 is 0.25 to 9.00.

Toner for development of electrostatic latent images has a toner particle including a toner core particle and a shell layer that coats it. The toner core particle includes, at least, a binder resin and a colorant. The toner core particle contains as the binder resin a particular polyester resin having a repeating unit derived from 1,2-propanediol. The shell layer contains a alcoholic hydroxy group containing resin having one or more types of repeating unit having an alcoholic hydroxy group. The proportion of an alcoholic hydroxy group containing monomer in the alcoholic hydroxy group containing resin is 1 mass % or more. The coverage ratio of the surface of the toner core particle with the shell layer is 75% or more.

To provide a two component developer having stable transfer characteristics and positive chargeability and having excellent drum cleaning property.SOLUTION: The two component developer includes: a positively chargeable toner including: a toner mother particle including a toner core and a shell layer formed from a resin containing an acrylic resin; and an external additive adhering to a surface of the toner mother particle; and a carrier having a surface coated with a resin coating layer containing a silicone resin. The external additive includes silicone-modified acryl resin particles having a volume-average particle size of at least 40nm and no greater than 140nm. When the toner is subjected to an ultrasonic treatment in which ultrasonic vibration at a power of 100W and a frequency of 28kHz is applied for 1 minute in an aqueous dispersion liquid containing the toner and a nonionic surface active agent, the amount of the silicone-modified acryl resin particles detached and liberated from the toner base particles is 0.35 mass% or less with respect to the adhesion amount of the silicone-modified acryl resin particles before the ultrasonic treatment.SELECTED DRAWING: Figure 1

To provide an image forming apparatus capable of suppressing the occurrence of white spots and achieving low-temperature fixability at the same time. [Solution] A developing device having a developer and a developer carrier for carrying the developer, wherein the developer contains a toner having toner particles containing a binder resin, the toner particles having a core-shell structure with a core containing an ester compound and a shell formed on the surface of the core, the ester compound and the shell containing a compound having a specific structure, and the developer carrier has a substrate having a conductive outer surface and a resin layer on the outer surface side of the substrate, and the resin layer contains carbon black that meets specified requirements.

A toner including toner particles and an external additive adherent to a surface of the toner particles has the following configuration. The toner particles contain an amorphous polyester resin, a crystalline polyester resin, a release agent, and a first fatty acid metal salt. The first fatty acid metal salt includes a trivalent or higher metal ion. The first fatty acid metal salt in the toner particles has an average dispersion size of 50 nm or more and 500 nm or less. The external additive contains a second fatty acid metal salt.

To provide printing systems including multilayer films that achieve proper wetting and anchoring of ink compositions without requiring additional primer layer or corona or plasma treatments.SOLUTION: The present invention relates to printing systems and methods that may include an ink composition including electrically charged ink particles dispersed in a hydrocarbon liquid and a multilayer film. The multilayer film may include a polymeric core layer; and one or more printing layers adjacent to the polymeric core layer. The one or more printing layers may include at least 50 wt.% of an ethylene vinyl acetate copolymer having acid and acrylate functional groups. The ethylene vinyl acetate copolymer having acid and acrylate functional groups may include from 0.5 wt.% to 4 wt.% methacrylic or acrylic acid; from 0.5 wt.% to 4 wt.% acrylate, from 7 wt.% to 40 wt.% vinyl acetate; and the balance ethylene, based on the total weight of the ethylene vinyl acetate copolymer having acid and acrylate functional groups.SELECTED DRAWING: None

To provide a powder container capable of preventing powder from adhering to an inner surface of the powder container and facilitating removal of the powder.SOLUTION: A powder container for storing powder has an inner surface in which a surface roughness Sz of is between 0.1 μm and 3.0 μm.SELECTED DRAWING: Figure 1

To provide a two-component developer and an image forming apparatus that offer excellent developability while suppressing carrier rise and fogging. [Solution] A two-component developer comprising a carrier having a resin coating layer on the surface of a carrier core material and a toner having toner particles has the following configuration: The resin coating layer includes an outer layer and an inner layer having a higher electrical resistance than the outer layer. The outer layer and the inner layer contain a resin obtained by crosslinking and curing two or more silicone resins with different weight-average molecular weights, and the weight-average molecular weights of the two or more silicone resins satisfy specific conditions. In the carrier, the content of the inner layer per 100 parts by mass of the carrier core material is 0.2 parts by mass or more, the content of the outer layer per 100 parts by mass of the carrier core material is 0.1 parts by mass or more, and the total content of both layers per 100 parts by mass of the carrier core material is 1.0 part by mass or less. The toner contains a magnetic material in the toner particles.

To provide a toner that can prevent embedding of an external additive, and can achieve both low temperature fixability and transfer properties.SOLUTION: A toner has a toner particle that contains a binder resin and organic silicon polymer particles on a surface of the toner particle. The binder resin contains a crystalline resin. When TE (MPa) is the Young's modulus measured by a micro compression tester at 25°C by using a test piece obtained by pelletizing the toner, and SiE (MPa) is the Young's modulus measured by the micro compression tester at 25°C by using one particle of the organic silicon polymer particles separated from the toner, The TE and the SiE satisfy 800≤TE≤2500 and 1.5≤SiE / TE≤10.0.SELECTED DRAWING: None

Magnetic carrier include a carrier core and a resin coat layer that coats the surface of the carrier core, and can electrostatically charge toner positively by friction. The resin coat layer contains polyimide silicone resin and silica particles.

To provide an external additive which offers sufficient charged amount of charge, superior charging performance stability, and high fluidity, and to provide a toner.SOLUTION: A toner external additive is provided, containing silica particles surface-treated with polyacid metal salt particles, where the polyacid metal salt particles are composed of a salt of a polyacid and a titanium compound.SELECTED DRAWING: Figure 1

To provide a green toner for electrostatic image development that can form a green image with high brightness and saturation. [Solution] The green toner for electrostatic image development contains green toner particles. The green toner particles contain a binder resin, CI pigment yellow 101, and at least one non-fluorescent pigment selected from the group consisting of CI pigment green 7, CI pigment green 36, CI pigment green 58, CI pigment green 59, and CI pigment blue 76, wherein the mass-based ratio M2 / M1 of the content M1 of CI pigment yellow 101 to the content M2 of the non-fluorescent pigment is 0.05 or more and 1.5 or less, and the total content of CI pigment yellow 101 and the non-fluorescent pigment relative to the total green toner particles is 5% by mass or more and 15% by mass or less.