1545results about "Developers" patented technology

A toner comprises toner particles and an external additive adhering to surfaces of the toner particles, wherein the toner particle includes a crystalline polyester resin and a wax, the external additive includes organic / inorganic composite fine particles and an associated silica having two or more primary particles being associated with each other, and the toner has a softening point of 110° C. or lower.

An electrostatic charge image developing toner, an electrostatic charge image developer, a toner cartridge, a process cartridge, an image forming apparatus, and an image forming method, the electrostatic charge image developing toner having toner particles containing an amorphous polyester resin, a crystalline polyester resin, and cross-linked resin particles, the internal cross-linked resin particles are styrene-(meth) acrylic copolymer particles and have an average dispersion diameter of 100 nm or more and 300 nm or less, and when a 3 [mu] m * 3 [mu] m square region of 600 [pix] 600 [pix] is divided into n * n in a cross-sectional view of the toner particles, the average dispersion diameter of the internal cross-linked resin particles is 1 [mu] m or less, and the average dispersion diameter of the internal cross-linked resin particles is 1 [mu] m or less. When DAR (n) is the coefficient of variation of the area ratio of the added cross-linked resin particles with respect to the area of the divided regions in the n * n divided regions, and slopeF (16) is the slope of an approximate straight line in a dispersion plot plotted by changing n to 3, 4, 6, 8, 12, and 16 with log [1 / n] as the X axis and log [DAR (n)] as the Y axis, formula (1) is satisfied: 0.6 < = slopeF (16).

A toner includes toner particles each containing a binder resin. The binder resin contains 50% or more by mass of a polyester A containing 60 mol % or more of a unit derived from isophthalic acid as an acid component. The toner includes agglomerates on surfaces of the toner particles, each of the agglomerates containing silica and a resin. The toner has a CI (% by number) of 1% or more by number and 15% or less by number, CI being the percentage by number of the toner particles including the agglomerates. The percentage by number of the toner particles including the agglomerates satisfies predetermined requirements.

An image formation apparatus may include: a first image formation unit including a storage part and configured to form a glitter developer image; and a controller. The controller may be configured to control the first image formation unit, (i) upon forming a glitter image on a medium based on predetermined print data when a remaining amount of a glitter developer in the storage part is a first remaining amount, to form the glitter developer image with a ratio of the glitter image per unit area being a first area ratio, and (ii) upon forming the glitter image on the medium based on the predetermined print data when the remaining amount is a second remaining amount less than the first remaining amount, to form the glitter developer image with the ratio of the glitter image per unit area being a second area ratio greater than the first area ratio.

To provide an electrophotographic apparatus and a process cartridge each suppressing the occurrence of image smearing in an output image under a high-temperature and high-humidity environment, provided are the following electrophotographic apparatus and process cartridge. That is, provided are an electrophotographic apparatus including: an electrophotographic photosensitive member; a charging unit; an image exposing unit; a developing unit; and a transferring unit, wherein the electrophotographic photosensitive member includes a surface layer containing indium tin oxide particles and a (meth)acrylic resin, and wherein the toner contains strontium titanate particles as an external additive, and a process cartridge.

A fine particle of a silicon polymer, wherein the fine particle has pores; the total pore volume of the fine particle is 0.35 to 1.00 cm3 / g; a number-average primary particle diameter of the fine particle is 0.05 to 0.30 μm; the silicon polymer has a siloxane bond and an Si—R1 bond; R1 represents an alkyl group having 1 to 6 carbon atoms; and designating, with reference to a chart obtained by 29Si-NMR measurement of the fine particle, A as a total peak area corresponding to the silicon polymer, and B as a peak area corresponding to Si—R1, A and B satisfy a following formula (1):10.0≤B / A×100≤45.0  (1).

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.

A toner containing a toner particle containing a binder resin and a wax, wherein the binder resin contains a crystalline resin, the content of the crystalline resin is within a specific range, in viscoelastic measurement of the toner, when a storage elastic modulus of the toner at a temperature T (° C.) is G′(T), in a graph in which a horizontal axis represents the temperature T, and a vertical axis represents a value d(log G′(T)) / dT obtained by differentiating Log G′(T) with respect to the temperature T, the local minimum value is observed in a specific range, when a temperature at which the local minimum value is reached is defined as a temperature T1 (° C.), d(log G′(T1)) / dT, d(log G′(T1+3)) / dT≤0, G′(T1), and G′(T1+30) satisfy specific relationships.

An external additive for toner, wherein the external additive is an organosilicon polymer particle, and defining A (nm) as the number-average particle diameter of primary particles of the external additive measured using a scanning electron microscope, and defining B (nm) as the number-average particle diameter of the external additive measured in accordance with a centrifugal sedimentation method, the A and the B satisfy a following Expression (1):1.5≤B / A≤3.0  (1).

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

The present invention provides: a powder which is capable of forming an electromagnetic wave absorption layer that has electromagnetic wave absorption characteristics in a wider frequency region than ever before and is suppressed in performance variation, and which can be electrostatically adhered or heat fixed to a support body; and an electromagnetic wave absorber which comprises a melt molded body of the powder as an electromagnetic wave absorption layer. The present invention provides: a powder which is capable of forming an electromagnetic wave absorption layer that has electromagnetic wave absorption characteristics in a wider frequency region than ever before and is suppressed in performance variation, and which can be electrostatically adhered or heat fixed to a support body; and an electromagnetic wave absorber which comprises a melt molded body of the powder as an electromagnetic wave absorption layer.

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.

An external additive for toner comprising a particle of a silicon polymer having a siloxane bond and a Si—O—C bond, wherein in an FT-IR spectrum of the external additive obtained by an ATR method, a maximum peak is present in a range of from 1030 cm−1 to 1070 cm−1, where an average intensity in a range of from 1015 cm−1 to 1025 cm−1 of the spectrum is denoted by A and an average intensity in a range of from 1085 cm−1 to 1095 cm−1 is denoted by B, the A and the B satisfy a following formula (1):0.5⁢5≤A / B≤1.5.(1)

Provided is a toner comprising: a toner particle containing a binder resin; and an organic silicon polymer particle on a surface of the toner particle, wherein the binder resin contains a crystalline resin, and when the toner particle is pelletized and a Young's modulus of the toner measured in a micro compression test at 25° C. is represented by TE (MPa) and when one organic silicon polymer particle is separated from the toner and a Young's modulus of the one organic silicon polymer particle measured in a micro compression test at 25° C. is represented by SiE (MPa), TE and SiE satisfies 800≤TE≤2500 and 1.5≤SiE / TE≤10.0.

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 comprises a toner particle comprising a resin A and a resin B, wherein the resin A has a structure represented by a predetermined general formula, and the resin B has a monomer unit represented by a predetermined general formula, and a toner manufacturing method comprises a step of dispersing a toner base particle comprising the resin B in an aqueous medium to obtain a toner slurry, and a step of adding a radical polymerization initiator and a monomer composition comprising a monomer represented by a predetermined general formula to the resulting toner slurry to form the resin A on a surface of the toner base particle.

A developing roller having a conductive substrate and a resin layer present on the outer surface side of the substrate, wherein the developing roller is for a positive-charging toner, the resin layer contains a crosslinked urethane resin, an amino group is present at an outermost surface of the resin layer, where an ion intensity derived from the amino groups relative to all detected ions in the resin layer is 1.0% or more, a ratio of the total of detected values of Si, F, and Cl at the outermost surface of the resin layer is less than 5.0 Atomic %, and the elastic modulus and volume resistivity of the resin layer satisfy a specific relationship.

A magnetic toner comprising a toner particle comprising a binder resin and a magnetic body, wherein the binder resin comprises a styrene-acrylic resin, the styrene-acrylic resin comprises a monomer unit represented by Formula (1):where, in Formula (1), R1 represents a hydrogen atom or a methyl group; and R2 represents a linear alkyl group having CB carbon atoms, CB being an integer from 10 to 15; the magnetic body comprises an alkyl group having CM carbon atoms, on a surface of the magnetic body, CM being an integer from 4 to 20; CB and CM satisfy Formula (3):|CM−CB|≤10  (3), andin a cross-sectional observation of the magnetic toner using a transmission electron microscope, a coefficient of variation of an occupied area ratio of the magnetic body in a specific square grid, is 80.0% or lower.

To provide a compound which is fluidized and un-fluidized reversibly by light irradiation, has no significant coloration, improves fixability when used in a toner, and has excellent image stability and color reproducibility.SOLUTION: There is provided a compound represented by following general formula (1) which is fluidized and un-fluidized reversibly by light irradiation. Wherein, Z1 and Z2 are CH or N and Z1≠Z2, R1 is an aromatic hydrocarbon group having a substituent Ra selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom, respectively, in two ortho-positions with respect to Z1, and R2 is a substituted or unsubstituted aromatic heterocyclic group.SELECTED DRAWING: None

A fixing member includes a slide layer having a cylindrical shape and a thickness of 8 micrometers (μm) or more and 20 μm or less, a base layer formed on an outer side of the slide layer, and a surface layer formed on an outer side of the base layer. The slide layer has Benard convection cell structure having an average diameter of 50 μm or more and 200 μm or less on a surface that is not in contact with the base layer, and the slide layer includes an additive having a median particle diameter D50 of 4.5 μm or less and an aspect ratio of 30 or more and less than 50.

A toner comprising a toner particle comprising a binder resin and a release agent, wherein the binder resin comprises a crystalline resin A, the crystalline resin A comprises a monomer unit derived from a monomer (a), the monomer (a) is at least one selected from the group consisting of (meth)acrylic acid esters having an alkyl group with 18 to 36 carbon atoms, the peak temperature and endothermic quantity at an endothermic peak derived from the crystalline resin A in DSC measurements using the toner satisfy specific relationships, and the release agent is at least one selected from the group consisting of hydrocarbon-based waxes and ester waxes.

A toner having high rub resistance is provided. A toner including a toner particle containing a binder resin and a calcium carbonate particle, wherein in X-ray diffractometry of the toner particle by CuKα radiation, when the Bragg angle is defined as θ, (i) the calcium carbonate particle has peaks at 2θ of 26.5°±0.5° and 29.5°±0.5°, (ii) a crystallite diameter of crystals thereof attributed to 2θ=29.5°±0.5° is 10 nm or more and 45 nm or less, and (iii) the ratio (a / b) of a peak intensity “a” at 2θ=26.5°±0.5° to a peak intensity “b” at 2θ=29.5°±0.5° is 0.15 or more and 0.24 or less.

Toner includes toner particles containing a binder resin and an external additive, wherein 1) the binder resin contains a polyester A in an amount of 50% by mass or more, and the polyester A contains a unit Uiso derived from isophthalic acid in an amount of 90% by mole or more based on all units derived from an acid component, and 2) the toner contains hydrotalcite particles as the external additive.

A toner comprising a toner particle comprising a binder resin, wherein the binder resin comprises an amorphous polyester A and a crystalline polyester C; the amorphous polyester A has an amorphous polyester segment a1 and a2; the amorphous polyester segment a2 has a monomer unit of a specific alcohol a0; the crystalline polyester C is a polymer having a crystalline polyester segment c2 and a crystalline segment c1 bonded to the end of the crystalline polyester segment c2; the crystalline polyester segment c2 has a monomer unit of a specific alcohol b0; an absolute value of a difference between a carbon number of the linear aliphatic polyhydric alcohol a0 and a carbon number of the linear aliphatic polyhydric alcohol b0 is 4 or less; and SP values of the polyester segment a1 and a2, and the crystalline segment c1 and the crystalline polyester segment c2 satisfy specific relationships.

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.

To improve additives used in formation of EA ULM toners, and to improve sensitivity of toner compositions to environmental conditions including relative humidity.SOLUTION: A toner composition, a developer, and an additive for a toner composition are disclosed. The toner composition comprises toner particles containing at least one type of resin, an optional colorant, an optional wax, and a polymeric toner additive provided on at least portions of external surfaces of the toner particles. The polymeric toner additive comprises a polymeric resin containing a fluorinated acrylic monomer, a cross-linkable monomer containing two or more vinyl groups at 8 wt.% to 40 wt.% of the polymeric resin, and optionally a charge control agent consisting of a nitrogen-containing group at 0.1 wt.% to 1.5 wt.% of the polymeric resin.SELECTED DRAWING: None