Abstract: The pigment dispersion is a pigment dispersion including a fluorescent agent, wherein, when at a wavelength of 250 nm or more and 290 nm or less, an integral value of an emission intensity in a wavelength range of 400 nm or more and 700 nm or less of an emission spectrum of the fluorescent agent for excitation light is represented by F1, an integral value of an emission intensity in a wavelength range of 400 nm or more and 700 nm or less of an emission spectrum of the pigment dispersion for excitation light is represented by F2, and a ratio of the fluorescent agent contained in a solid content obtained when the pigment dispersion is heated at 130° C. until a change in mass of the pigment dispersion reaches 0.3%/min or less is represented by W1 (mass%), the F1, the F2, and the W1 satisfy the formulae F2x 100/W1?F1 ×0.30 and 5.0?W1?80.0.

Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10?4 N, of from 200 MPa to 1,100 MPa.

Abstract: Provided is a toner containing a colorant and a binder resin, wherein, in a wettability test of the toner with respect to a methanol/water mixed solvent, the methanol concentration when the transmittance of light at a wavelength of 780 nm is 50% is at least 5.0 volume % and not more than 30.0 volume %, and the interparticle force measured by rupturing a consolidation of the toner formed by compression of the toner with a load of 78.5 N is at least 1.0 nN and not more than 25.0 nN.

Abstract: A toner comprising a toner particle that contains a binder resin and a release agent, wherein the toner particle has a surface layer that contains an organosilicon polymer and the luminance histogram of a backscattered electron image of the toner particle has two peak values P1 and P2 and a minimum value V between P1 and P2, P2 originates from the organosilicon polymer, and the luminance giving P1 and P2 are in specific ranges, percentages for P1 and P2 are each at least 0.50%, and using the luminance Bl at V as a reference point, specific relationships are satisfied by A1, AV, and A2, where A1 is the total number of pixels at luminance from 0 to (Bl?30 ), AV is the total number of pixels at luminance from (Bl?29 ) to (Bl+29 ), and A2 is the total number of pixels at luminance from (Bl+30 ) to 255.

Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10?4 N, of from 200 MPa to 1,100 MPa.

Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10?4 N, of from 200 MPa to 1,100 MPa.

Abstract: A toner comprising a toner particle that contains a binder resin and a release agent, wherein the toner particle has a surface layer that contains an organosilicon polymer and the luminance histogram of a backscattered electron image of the toner particle has two peak values P1 and P2 and a minimum value V between P1 and P2, P2 originates from the organosilicon polymer, and the luminance giving P1 and P2 are in specific ranges, percentages for P1 and P2 are each at least 0.50%, and using the luminance Bl at V as a reference point, specific relationships are satisfied by A1, AV, and A2, where A1 is the total number of pixels at luminance from 0 to (Bl?30), AV is the total number of pixels at luminance from (Bl?29) to (Bl+29), and A2 is the total number of pixels at luminance from (Bl+30) to 255.

Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10?4 N, of from 200 MPa to 1,100 MPa.

Abstract: Provided is a toner containing a colorant and a binder resin, wherein, in a wettability test of the toner with respect to a methanol/water mixed solvent, the methanol concentration when the transmittance of light at a wavelength of 780 nm is 50% is at least 5.0 volume % and not more than 30.0 volume %, and the interparticle force measured by rupturing a consolidation of the toner formed by compression of the toner with a load of 78.5 N is at least 1.0 nN and not more than 25.0 nN.

Abstract: A toner having a toner particle containing a binder resin and a crystalline material, wherein when “a” is an endothermic quantity deriving from the crystalline material in a DSC of the toner and “b” is an endothermic quantity deriving from the crystalline material in a DSC of the toner that has been held for 10 hours in an environment with a temperature of 55° C. and a humidity of 8% RH, the “a” and “b” satisfy a relationship a/b?0.85; in a dynamic viscoelastic measurement of a non-melt-molded pellet of the toner, the toner has a temperature range A for which G??1×105 Pa and tan ?<1 are satisfied; and in a dynamic viscoelastic measurement of a melt-molded pellet of the toner, the toner has a temperature range B for which tan ?>1 is satisfied within the temperature range A.

Abstract: A toner having a toner particle which contains a binder resin, a fatty acid metal salt, and a resin having an ionic functional group, in which the fatty acid metal salt is a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28, and the acid dissociation constant pKa of the resin having an ionic functional group is at least 6.0 and not more than 9.0.

Abstract: Disclosed is a toner including toner particles each including a core portion that contains a binder resin, and a surface layer containing an organosilicon polymer, in which each of the toner particles contains a polyvalent metal element having a resistivity of 2.5×10?8 ?·m or more and 10.0×10?8 ?·m or less at 20° C., and when the toner particles are subjected to X-ray fluorescence analysis, a net intensity originating from the polyvalent metal element is 0.10 kcps or more and 30.00 kcps or less.

Abstract: A toner contains a styrene acrylic resin, a block polymer, and an organosilicon polymer, in which the organosilicon polymer has a specific partial structure, the block polymer has a polyester segment and a vinyl polymer segment, the melting point is 55° C. or more and 90° C. or less, the mass ratio of the polyester segment to the vinyl polymer segment is 40/60 to 80/20, and the polyester segment has a specific unit.

Abstract: Disclosed is a toner including toner particles each including a core portion that contains a binder resin, and a surface layer containing an organosilicon polymer, in which each of the toner particles contains a polyvalent metal element having a resistivity of 2.5×10?8 ?·m or more and 10.0×10?8 ?·m or less at 20° C., and when the toner particles are subjected to X-ray fluorescence analysis, a net intensity originating from the polyvalent metal element is 0.10 kcps or more and 30.00 kcps or less.

Abstract: A toner having a toner particle containing a binder resin and a crystalline material, wherein when “a” is an endothermic quantity deriving from the crystalline material in a DSC of the toner and “b” is an endothermic quantity deriving from the crystalline material in a DSC of the toner that has been held for 10 hours in an environment with a temperature of 55° C. and a humidity of 8% RH, the “a” and “b” satisfy a relationship a/b?0.85; in a dynamic viscoelastic measurement of a non-melt-molded pellet of the toner, the toner has a temperature range A for which G??1×105 Pa and tan ?<1 are satisfied; and in a dynamic viscoelastic measurement of a melt-molded pellet of the toner, the toner has a temperature range B for which tan ?>1 is satisfied within the temperature range A.

Abstract: A toner having a toner particle which contains a binder resin, a fatty acid metal salt, and a resin having an ionic functional group, in which the fatty acid metal salt is a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28, and the acid dissociation constant pKa of the resin having an ionic functional group is at least 6.0 and not more than 9.0.

Abstract: Provided is a toner that is improved in transferability as compared to the related art and that keeps its effects through repeated use. In particular, provided is a toner suppressed in dependency on transfer current control. The toner includes a toner particle including a surface layer containing an organosilicon polymer and a resin having an ionic functional group, the organosilicon polymer having a partial structure represented by the following formula (1), the toner particle containing 5.0% or more of the partial structure represented by the formula (1) per 1.000 silicon atom contained in the organosilicon polymer, the resin having an ionic functional group having a pKa of 6.0 or more and 9.0 or less: R0—SiO3/2??(1) in the formula (1), R0 represents an alkyl group having 1 or more and 6 or less carbon atoms, or a phenyl group.

Abstract: Provided is a toner, including toner particle having surface layer, in which: the surface layer includes organosilicon polymer which has a partial structure represented by formula (1); in 29Si-NMR measurement of tetrahydrofuran-insoluble matter of toner particle, a ratio of a peak area for the partial structure represented by formula (1) to a total peak area for the organosilicon polymer is 5.0% or more; in X-ray photoelectron spectroscopic analysis of a surface of toner particle, a ratio of a density of a silicon atom dSi in the surface of toner particle is 1.0 to 28.6 atom %; and in a roughness curve of toner particle measured by using a scanning probe microscope: an arithmetic average roughness Ra is 10 to 300 nm; ?Ra/Ra is 0.60 or less; an average length RSm of a roughness curve element is 20 to 500 nm; and ?RSm/RSm is 0.60 or less.

Abstract: A toner comprising a toner particle containing a binder resin, a colorant and a crystalline resin, wherein the loss elastic modulus G? of the toner at 20° C. is 1.5×108 Pa to 1.0×109 Pa, a shoulder appears at a temperature Tp (° C.) in the range of 30° C. to 45° C. in a temperature-loss elastic modulus curve, and, in Curve 1 obtained by differentiating the temperature-loss elastic modulus curve once by the temperature, the minimum value of the Curve 1 in the range of 60° C. or more is ?0.30 to ?0.15.

Abstract: A method is provided for producing toner particles containing an organosilicon polymer, produced by mixing an organosilicon compound and an aqueous medium containing base particles, and polymerizing the organosilicon compound. The organosilicon compound has a particular structure represented by formula (1) or (2). The organosilicon polymer is produced by polymerization at 80.0° C. or more and 105.0° C. or less.