Abstract: To provide a toner having both low temperature fixability and hot offset resistance and having excellent scratch resistance of a fixed image. A toner including a toner particle containing a binder resin, a crystalline polyester, and a calcium carbonate particle, in which the crystalline polyester includes a unit derived from an aliphatic diol and a unit derived from an aliphatic dicarboxylic acid, an ester group concentration Ec of the crystalline polyester is 27% by mass or more to 50% by mass or less, a content Ma of the calcium carbonate particle included in the toner particle is 3% by mass or more to 40% by mass or less, and a ratio (Ma/Mc) of the content Ma of the calcium carbonate particle included in the toner particle to a content Mc (% by mass) of the crystalline polyester included in the toner particle is 0.2 or more to 20 or less.

Abstract: A toner includes toner particles each containing a binder resin and a release agent, and composite particles each present on a surface of each toner particle. The release agent has a penetration of 4 or less at 25° C. The composite particles include fine particles A each containing an organosilicon compound having a siloxane bond, the organosilicon compound serving as a binder component, and fine particles B formed of inorganic fine particles. Each fine particle B is partially embedded at the surface of each fine particle A. In the fine particles A, the proportions of di- to tetra-functional silicon atoms satisfy predetermined requirements. The fine particles B have a number-average diameter of primary particles of 0.01 ?m or more and 0.06 ?m or less. In the composite particles, the average value of embedding ratios of the fine particles B to the fine particles A is 30% or more and 90% or less.

Abstract: A toner contains toner particles and an external additive on the surfaces of the toner particles. The external additive includes composite fine particles that include fine particles A containing an organosilicon compound with siloxane bonds as a binder component and fine particles B at least partially embedded in the surfaces of the fine particles A with an embedding rate of 30% to 90% on average, and fine particles C including titanium oxide or titanic acid compound fine particles and having a volume resistivity of 2.0×109 to 2.0×1013 ?·cm and a number average diameter of primary particles of 10 to 100 nm. The organosilicon compound contains bifunctional, trifunctional, and tetrafunctional silane monomers with specific relationships. The number average diameter X of primary particles of the composite fine particles and the number average diameter Y of primary particles of fine particles C satisfy 1.0?X/Y?10.0.

Abstract: A toner including a toner particle, a composite particle present on a surface of the toner particle, and a spherical silica fine particle. The composite particle includes a fine particle A containing an organic silicon compound as a binder component, and a fine particle B which is an inorganic fine particle. The fine particle B is present on a surface of the composite particle in a state where a part of the fine particle B is embedded in a surface of the fine particle A. The composite particle and the silica fine particle each have a predetermined particle diameter, proportions of bifunctional to tetrafunctional silicon atoms in the fine particle A satisfy predetermined requirements, and an average value of embedding ratios of the fine particle B to the fine particle A in the composite particle is 30% or greater and 90% or less.

Abstract: A toner including a toner particle and a composite particle present on a surface of the toner particle. The composite particle includes a fine particle A containing, as a binder component, an organic silicon compound, and a fine particle B which is an inorganic fine particle. The fine particle B is present in a state where a part of the fine particle B is embedded in a surface of the fine particle A. Proportions of silicon atoms in bifunctional to tetrafunctional silane monomers of the fine particle A satisfy predetermined relationships. A primary particle of the fine particle B has a number average particle diameter of 0.01 ?m or greater and 0.06 ?m or less. An average value of embedding ratios of the fine particle B to the fine particle A in the composite particle is 30% or greater and 90% or less.

Abstract: A toner comprising a toner particle comprising a binder resin and a release agent, wherein the binder resin comprises a first resin and a second resin; the first resin is a crystalline resin having a melting point Tp of 50° C. to 90° C.; the second resin is an amorphous resin; in a cross section of the toner particle observed by a transmission electron microscope, the cross section of the toner particle has a matrix-domain structure composed of a matrix comprising the first resin and domains comprising the second resin; an area ratio of the matrix comprising the first resin in a total area of the cross section of the toner particle is 35 to 70 area %; and where a longest direction of each of the domains is taken as a longitudinal direction, a standard deviation of an angle of the longitudinal direction of the domains is 25° or less.

Abstract: A fine particle of a silicon polymer having a siloxane group and a silanol group, wherein a moisture adsorption amount of the fine particle at a temperature of 30° C. and a humidity of 80% RH is from 1.0 mg/g to 22.0 mg/g, an amount of the silanol group of the fine particle measured by a titration method using KOH is from 0.012 mmol/g to 0.120 mmol/g, and a number average particle diameter of primary particle of the fine particle is from 0.05 ?m to 0.30 ?m.

Abstract: An external additive for toner comprising a particle of a silicon polymer having a siloxane bond and a Si—R1 bond, wherein the R1 represents an alkyl group having from 1 to 6 carbon atoms, in a chart obtained by 29Si—NMR measurement of the external additive, where a total peak area attributed to the external additive is denoted by A, and a peak area attributed to the Si—R1 bond is denoted by B, a following formula (1) is satisfied, and in the chart obtained by 29Si—NMR measurement of the external additive, where a total peak area attributed to the silicon polymer is denoted by SA, and a peak area attributed to a T unit structure is denoted by S3, a following formula (2) is satisfied; 0.26 0 ? B / A ? 0 .450 ( 1 ) 0. ? S ? 3 / SA ? 0 ? .50 .

Abstract: A toner comprises a toner particle that contains a binder resin having a crystalline resin and an amorphous resin, and a wax, wherein a matrix-domain structure made up of a matrix including the crystalline resin, and domains including the amorphous resin, is present in a cross-sectional observation of the toner, the crystalline resin has a specific monomer unit, in a differential curve, which is obtained through differentiation of a temperature-storage elastic modulus curve by temperature, with temperature being a horizontal axis and a common logarithm Log G? of a storage elastic modulus G? being a vertical axis as obtained in a viscoelasticity measurement of the toner, the differential curve has specific minimal values P1 and P2 within specific temperature ranges, and has storage elastic moduli G? at the temperatures of the minimal values P1 and P2 lie in respective specific ranges.

Abstract: The external additive for toner includes an external additive particle containing: a fine particle A; and a plurality of fine particles B that are each present so as to partially protrude from a surface of the fine particle A, wherein the fine particle A (i) is a particle of an organosilicon compound having a siloxane bond, (ii) has a number-average particle diameter of 0.03 ?m or more and 0.30 ?m or less, and (iii) has an average circularity of 0.90 or more, wherein, when the number-average particle diameter of the fine particle A is represented by DA, and a number-average particle diameter of the plurality of fine particles B is represented by DB, DB/DA is 0.10 or more and 0.63 or less.

Abstract: An external additive for toner comprising: a fine particle A containing, as a binder component, an organosilicon compound having a siloxane bond; and a fine particle B that is present on a surface of the fine particle A in a state of being at least partially embedded in the surface of the fine particle A, wherein the external additive for toner (i) has a number-average particle diameter of a primary particle of 0.03 ?m or more and 0.30 ?m or less, and (ii) has a Young's modulus of 10 GPa or more and 30 GPa or less, wherein content ratios, on a number basis, of the following unit (a), unit (b), and unit (c) in the fine particle A based on all silicon atoms present in the fine particle A satisfy the following expressions (1) and (2). (a)+(b)+(c)?0.80??(1) (b)+(c)?0.

Abstract: The external additive for toner includes an external additive particle containing: a base particle A; and a plurality of convex forming particles B each configured to form a convex portion on a surface of the base particle A. The base particle A and the convex forming particles B are particles each containing a silicon compound having a siloxane bond, and a chemical bond is formed between the base particle A and each of the convex forming particles B. The base particle A and the convex forming particles B each have a total content of the following unit (a), unit (b), and unit (c) of 80 mass % or more and 100 mass % or less: where R1 and R2 each represent an alkyl group having 1 or more and 6 or less carbon atoms.

Abstract: A toner comprising a toner particle comprising a binder resin and a wax, wherein the binder resin comprises an amorphous polyester resin and a polymer A, contents of the amorphous polyester resin and the polymer A in the binder resin are within specific ranges, the polymer A comprises a first monomer unit in which ester (meth)acrylates comprising 18 to 36 carbon atoms are polymerized, a content ratio of the first monomer unit in the polymer A is within specific range, the toner comprises a matrix-domain structure comprising a matrix comprising the amorphous polyester resin and domains, and the domains comprise a domain A comprising at least 80 mass % of the polymer A and a domain B comprising at least 80 mass % of the wax.

Abstract: The fine particle is a silicon-containing fine particle, wherein the number-average diameter of the fine particle is 0.05 ?m to 0.30 ?m; the proportion of the silicon atom with reference to the total of the elements is at least 20% according to fluorescent x-ray measurement of the fine particle; and, with respect to the silicon atom proportions measured in analysis by x-ray photoelectron spectroscopy while irradiating with Ar-K? radiation and etching, the proportions of silicon atoms having prescribed structures vary at prescribed depths.

Abstract: A yellow toner including a toner particle including a binder resin, a crystalline resin, and C.I. Pigment Yellow 180, a content of the C.I. Pigment Yellow 180 is 3% by mass or more and 15% by mass or less with respect to a mass of the toner, the C.I. Pigment Yellow 180 is in a form of plate-like particles each having a plate-like shape, and when the C.I. Pigment Yellow 180 is observed with a scanning electron microscope, the plate-like particles of the C.I. Pigment Yellow 180 satisfy the following relationships: S/Z?10.0; and 50?S?300, where the S (nm) represents a number average of circle-equivalent diameters calculated from areas of surfaces having largest areas of the plate-like particles, and the Z (nm) represents a number average of widths in directions perpendicular to the surfaces having the largest areas of the plate-like particles.

Abstract: A toner has a toner particle containing a binder resin having a first resin and a second resin. The first resin is a crystalline resin, the second resin is an amorphous resin, and the first resin has a first monomer unit, a second monomer unit and a third monomer unit, each having a specific structure. A content of the first monomer unit a content of the third monomer unit in the first resin, and an SP value of the second monomer unit all satisfy a specific ranges, and the second resin contains at least one vinyl-based resin and/or specific hybrid resin, with a cross section of the toner having a domain-matrix structure formed of a matrix including the first resin and domains including the second resin, a number average diameter of the domains being 0.10 to 2.00 ?m.

Abstract: A toner comprising a toner particle that contains a binder resin and a wax, wherein the binder resin contains an amorphous polyester resin, a polymer A, and a component B, a content of the amorphous polyester resin in the binder resin is at least 50.0 mass %, the polymer A has first monomer units represented by Formula (C) below and second monomer units, RZ3 represents a hydrogen atom or a methyl group, R represents a C18 to C36 alkyl group, a content ratio of the first monomer units in the polymer A is from 5.0 mol % to 60.0 mol %, an SP value of the second monomer units is at least 21.00, a content of the polymer A in the binder resin is from 0.10 mass % to 10.00 mass %, and SP values of the amorphous polyester resin, the polymer A, the component B and the wax satisfy specific relationships.

Abstract: A toner, comprising a toner particle comprising a binder resin, wherein in a viscoelasticity measurement performed on a molded sample resulting from compression molding of the toner to a disc shape, and in which a strain in the molded sample is caused to vary, at 90° C., a storage elastic modulus G?(1) of the molded sample at 1% strain is 7500 to 30000 Pa, and a storage elastic modulus G?(50) of the molded sample at 50% strain is 950 to 6000 Pa.

Abstract: A two component developer comprising a toner and a specific magnetic carrier, wherein a toner particle in the toner comprises a surface layer comprising an organosilicon polymer, electrical conductivity of a filtrate obtained by filtering off the toner using a specific procedure is 1.0 to 2.5 ?S/cm, and when dC (atomic %) denotes carbon concentration, dO (atomic %) denotes oxygen concentration and dSi (atomic %) denotes silicon concentration, as measured by ESCA, at the surface of the toner particle, then the dC, the dO and the dSi satisfy the following formulae: 40.0?dC/(dC+dO+dSi)×100?60.0 10.0?dSi/(dC+dO+dSi)×100?26.0.

Abstract: The present disclosure provides a fine particle containing silicon, wherein the fine particle has a number-average particle diameter of a primary particle of 0.05 ?m or more and 0.20 ?m or less, wherein the fine particle contains a silicon atom at a ratio of 20% or more with respect to all elements in measurement by X-ray fluorescence.