Abstract: A production method of a toner having a toner particle that contains a binder resin and an external additive that is externally added to the toner particle, wherein the production method has a toner particle dispersion step of obtaining a toner particle dispersion by dispersing the toner particle and an inorganic dispersant in an aqueous medium; and an external addition step of externally adding the external additive to the toner particle through addition of the external additive to the toner particle dispersion.

Abstract: A seal member including a resin portion that contains a resin and a polymerization inhibitor, in which when an SP value [(J/cm3)0.5] of the resin is defined as SPb and an SP value [(J/cm3)0.5] of the polymerization inhibitor is defined as SPp, a relationship of Expression (1) is satisfied, SPp - SPb ? 16.37 Expression ? ( 1 ) when an area of the polymerization inhibitor in a cross section is set to 100% by area in observation of the cross section of the resin portion of the seal member, an area of the domain of the polymerization inhibitor with a short diameter of 5 ?m or greater is 25% by area or less.

Abstract: A toner comprising a toner particle that contains a binder resin and a wax, wherein the toner particle contains an organosilicon polymer as given by formula (1) below; R1—SiO3/2??(1), in formula (1), R1 is an alkyl group having from 1 to 4 carbons; in a cross section of the toner particle observed using a transmission electron microscope, in terms of a distance A from the centroid of the cross section of the toner particle to a contour of the cross section, the organosilicon polymer is present in a region that is not more than 80% of the distance A from the centroid; and an absolute value of a difference between an SP value of the organosilicon polymer and an SP value of the wax is not more than 0.70 (cal/cm3)1/2.

Abstract: A toner having a toner particle including a toner base particle and an organosilicon polymer coating the toner base particle, wherein when S1 (?m2) is a total area of a non-coated part not coated with the organosilicon polymer on an outermost surface of the toner particle, S2 (?m2) is a total area of a coated part coated with the organosilicon polymer on the outermost surface of the toner particle, and SA1 (?m2) is a total of areas of non-coated part domains D1 with an area of not more than 0.10 ?m2 in size in the non-coated part not coated with the organosilicon polymer, formulae (1) and (2) below are satisfied. 0.45?[S2/(S1+S2)]?0.65??(1) (SA1/S1)?0.

Abstract: A method of manufacturing toner particles, including a step of drying wet toner particles with a drying unit, the wet toner particles being obtained from an aqueous dispersion medium, wherein the drying unit includes a loop-type flash dryer in which the wet toner particles to be dried are supplied to a gas stream circulating in a loop-type drying pipe, the loop-type flash dryer includes: (i) a loop-type drying pipe; (ii) an inlet port for supplying wet toner particles to the loop-type drying pipe; (iii) an outlet port for discharging dried toner particles from the loop-type drying pipe; (iv) a first blowing port for blowing gas into the loop-type drying pipe; and (v) second blowing ports for blowing gas into the loop-type drying pipe.

Abstract: Provided is a toner containing a toner particle comprising a binder resin and an organosilicon polymer, wherein the organosilicon polymer contains an organosilicon polymer particle, the organosilicon polymer particle has a structure represented by the following formula (1): R1—SiO3/2??(1) in formula (1), R1 is a C1-4 alkyl group, and in cross-sectional observation of the toner particle by transmission electron microscopy, the organosilicon polymer particle is present in a region extending up to 80% of the distance A from the centroid out of the total distance A from the centroid of the toner particle cross-section to the contour of the cross-section, and the particle diameter of the organosilicon polymer particle is from 10 nm to 200 nm.

Abstract: Toner comprising a toner particle comprising a core particle comprising a binder resin and a shell formed on a surface of the core particle, wherein given YA (number %) as an abundance ratio of particles with a particle perimeter of less than 6.332 ?m, in a dispersion of the toner treated under the following ultrasound condition A, given XB as an average aspect ratio of the toner and YB (number %) as an abundance ratio of particles with a particle perimeter of less than 6.332 ?m, in a dispersion of the toner treated under the following ultrasound condition B, 0.75?XB?0.85 and 0.10?YA?YB?2.50 are satisfied: where ultrasound condition A: output frequency 30 kHz, output capacity 15 W, ultrasound intensity 100%, exposure time 300 s, and ultrasound condition B: output frequency 30 kHz, output capacity 15 W, ultrasound intensity 5%, exposure time 300 s.

Abstract: A production method of a toner having a toner particle that contains a binder resin and an external additive that is externally added to the toner particle, wherein the production method has a toner particle dispersion step of obtaining a toner particle dispersion by dispersing the toner particle and an inorganic dispersant in an aqueous medium; and an external addition step of externally adding the external additive to the toner particle through addition of the external additive to the toner particle dispersion.

Abstract: A toner having a toner particle including a toner base particle and an organosilicon polymer coating the toner base particle, wherein when S1 (?m2) is a total area of a non-coated part not coated with the organosilicon polymer on an outermost surface of the toner particle, S2 (?m2) is a total area of a coated part coated with the organosilicon polymer on the outermost surface of the toner particle, and SA1 (?m2) is a total of areas of non-coated part domains D1 with an area of not more than 0.10 ?m2 in size in the non-coated part not coated with the organosilicon polymer, formulae (1) and (2) below are satisfied. 0.45?[S2/(S1+S2)]?0.65??(1) (SA1/S1)?0.

Abstract: Provided is a toner containing a toner particle comprising a binder resin and an organosilicon polymer, wherein the organosilicon polymer contains an organosilicon polymer particle, the organosilicon polymer particle has a structure represented by the following formula (1): R1—SiO3/2 ??(1) in formula (1), R1 is a C1-4 alkyl group, and in cross-sectional observation of the toner particle by transmission electron microscopy, the organosilicon polymer particle is present in a region extending up to 80% of the distance A from the centroid out of the total distance A from the centroid of the toner particle cross-section to the contour of the cross-section, and the particle diameter of the organosilicon polymer particle is from 10 nm to 200 nm.

Abstract: A toner comprising a toner particle that contains a binder resin and a wax, wherein the toner particle contains an organosilicon polymer as given by formula (1) below; R1-SiO3/2 ??(1), in formula (1),R1 is an alkyl group having from 1 to 4 carbons; in a cross section of the toner particle observed using a transmission electron microscope, in terms of a distance A from the centroid of the cross section of the toner particle to a contour of the cross section, the organosilicon polymer is present in a region that is not more than 80% of the distance A from the centroid; and an absolute value of a difference between an SP value of the organosilicon polymer and an SP value of the wax is not more than 0.70 (cal/cm3)1/2.

Abstract: A toner has a toner particle including a binder resin, a colorant, and a wax, in which in a cross section of the toner particle observed under a scanning transmission electron microscope, a proportion of the number of toner particles having a void with a long diameter of 0.50 ?m or less is 60 number % or more, and a proportion of the number of toner particles having a void in a region from an outline of the cross section of the toner particle inward to 1.00 ?m in a total number of the toner particles having a void is 30 number % or less.

Abstract: A toner has a toner particle including a binder resin, a colorant, and a wax, in which in a cross section of the toner particle observed under a scanning transmission electron microscope, a proportion of the number of toner particles having a void with a long diameter of 0.50 ?m or less is 60 number % or more, and a proportion of the number of toner particles having a void in a region from an outline of the cross section of the toner particle inward to 1.00 ?m in a total number of the toner particles having a void is 30 number % or less.