Abstract: The present invention relates to a toner having a toner particle containing a binder resin containing a styrene acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment and has a melting point of 55° C. to 90° C., the polyester segment has a specific structure and a solubility parameter (SP) value of 9.40 to 9.85, and the vinyl polymer segment has a weight-average molecular weight (Mw) of 4000 to 15000.

Abstract: Provided is a toner, including a toner particle containing: a binder resin containing a styrene acrylic resin as a main component, a colorant, a hydrocarbon wax, and a wax dispersant, in which: the wax dispersant includes a polymer of a vinyl resin component and a hydrocarbon compound, the vinyl resin component including styrene and one or more kinds of vinyl-based polymerizable monomers except a styrene derivative; and a solubility parameter of the binder resin (A) a solubility parameter of the vinyl resin segment of the wax dispersant (C), and a solubility parameter of the hydrocarbon compound segment of the wax dispersant (D) satisfy the formulae (1) and (2). |A?C|?10.20 ??(1) C?D<1.

Abstract: The toner comprising a toner particle having a core-shell structure that contains a core containing an amorphous resin A and a crystalline resin and a shell containing an amorphous resin B, wherein the amorphous resin A contains a styrene-acrylic resin, the content of the styrene-acrylic resin is at least 50% by mass based on the total mass of the amorphous resin A, a degree of compatibility A between the amorphous resin A and the crystalline resin is at least 50% and not more than 100%, and a degree of compatibility B between the amorphous resin B and the crystalline resin is at least 0% and not more than 40%.

Abstract: A toner particle production method has an annealing step that is performed after the preparation of a resin solution by the dissolution or dispersion, in an organic solvent, of a binder resin having a polyester resin as its major component and a block polymer having a polyester segment and a vinyl polymer segment, and the preparation of a resin particle dispersion in which resin particles are dispersed by a dissolution suspension method, wherein, in this annealing step, the temperature of the obtained resin particle dispersion is held for at least 60 minutes in the temperature range from TgA-15 (° C.) to TmA (° C.), and under the conditions of a temperature variation range of not more than 20° C. and a temperature variation rate of not more than 0.35° C./minute.

Abstract: A toner includes a toner particle including a surface layer containing an organosilicon polymer. The toner particle contains a styrene acrylic resin and a block polymer that has i) a polyester segment C and a vinyl polymer segment A, the mass ratio C/A of the polyester segment C to the vinyl polymer segment A being 40/60 to 80/20, and ii) a melting point Tm of 55° C. to 90° C. The organosilicon polymer has a partial structure represented by Rf—SiO3/2.

Abstract: A toner having a toner particle including a binder resin, wherein the binder resin includes a styrene acrylic resin and a vinyl-modified crystalline polyester resin, the vinyl-modified crystalline polyester resin has a crystalline polyester segment having structures of following i) or a structure of following ii), i) at least two structures selected from the group consisting of a structure derived from an aliphatic dicarboxylic acid, a structure derived from an aliphatic diol and a structure derived from an aliphatic hydroxycarboxylic acid; ii) a structure derived from an aliphatic hydroxycarboxylic acid; and the vinyl-modified crystalline polyester resin has a specific modification rate.

Abstract: A toner that comprises a toner particle that contains a binder resin that contains a styrene-acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment; the polyester segment is obtained by condensation polymerization of: a monomer (a) selected from a group consisting of a prescribed monomer group A; and a monomer (b) selected from a group consisting of a prescribed monomer group B, and the content in the polyester segment of the substructure originating with the monomer (b) as calculated from the following formula is from at least 1.0 mol % to not more than 30.0 mol %: {monomer (b) [mol]/(monomer (a) [mol]+monomer (b) [mol])}×100.

Abstract: Provided is a toner including a toner particle containing a graft polymer, in which: the graft polymer has a crystalline polyester segment and an amorphous vinyl polymer segment; the crystalline polyester segment has a unit derived from a specific monomer (a) and a unit derived from a specific monomer (b); a content X (mol %) of the unit derived from the monomer (b) calculated from a specific formula is 1.0 mol % or more and 24 mol % or less; and a melting point of the graft polymer is 50° C. or more and 85° C. or less.

Abstract: The present invention relates to a toner including a toner particle containing a binder resin, wherein the binder resin contains a block polymer and a styrene-acrylic resin, the block polymer has a vinyl polymer segment and a polyester segment, the polyester segment has a branch structure and the block polymer has a melting point of 50° C. to 95° C.

Abstract: A toner containing a toner particle containing a binder resin, wherein the binder resin contains a styrene-acrylic resin and a crystalline resin, and the crystalline resin is a block polymer or a graft polymer in which the mass ratio between the crystalline segment and an amorphous segment is 30:70 to 90:10, and wherein, in the total heat flow measured for the binder resin by a temperature-modulated differential scanning calorimeter, the peak temperature of an endothermic peak is from 55.0° C. to 90.0° C., and the percentage of the endothermic quantity of the endothermic peak in the reversing heat flow with respect to the endothermic quantity of the endothermic peak in the total heat flow is from 0.0% to 35.0%.

Abstract: A compound having a bisazo moiety and a polyester moiety is provided. The compound can be provided as a pigment dispersant to improve the dispersion of an azo pigment in a water-insoluble solvent.

Abstract: Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.

Abstract: The present invention provides a toner that contains an azo pigment well-dispersed in a binder resin and has a satisfactory color tone. The toner contains toner particles each containing a binder resin and a colorant. Each of the toner particles contains a compound having a polyester moiety and a bisazo structure moiety. The colorant is the azo pigment.

Abstract: A method for producing toner particles that contain a binder resin having a styrene-acrylic resin as a main component, a colorant, and a block polymer that has polyester segments and vinyl polymer segments, has a step of producing resin particles in accordance with a suspension polymerization method or a dissolution suspension method, and thereafter, holding the temperature of the aqueous medium in which the resin particles are dispersed, for 60 minutes or more, between a glass transition point TgA (° C.) of the resin particles and an onset temperature TmA (° C.) of an endothermic peak derived from the block polymer in the resin particles, in such a manner that a temperature fluctuation rate not greater than 0.35° C./minute, and a temperature fluctuation range is not greater than 20° C.

Abstract: A toner particle production method has an annealing step that is performed after the preparation of a resin solution by the dissolution or dispersion, in an organic solvent, of a binder resin having a polyester resin as its major component and a block polymer having a polyester segment and a vinyl polymer segment, and the preparation of a resin particle dispersion in which resin particles are dispersed by a dissolution suspension method, wherein, in this annealing step, the temperature of the obtained resin particle dispersion is held for at least 60 minutes in the temperature range from TgA-15 (° C.) to TmA (° C.), and under the conditions of a temperature variation range of not more than 20° C. and a temperature variation rate of not more than 0.35° C./minute.

Abstract: Provided is a pigment dispersant for improving the dispersibility of an azo pigment for a water-insoluble solvent. More specifically, provided is a polyester, including at least one unit represented by one of the following formula (1) and the following formula (2): in the formula (1) and the formula (2): R1 represents an alkyl group having 1 to 6 carbon atoms or a phenyl group; R2 to R6 each represent a hydrogen atom, a COOR7 group, or a CONR8R9 group, provided that at least one of the R2 to R6 represents the COOR7 group or the CONR8R9 group; and the R7 to R9 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

Abstract: The present invention relates to a toner including a toner particle containing a binder resin, wherein the binder resin contains a block polymer and a styrene-acrylic resin, the block polymer has a vinyl polymer segment and a polyester segment, the polyester segment has a branch structure and the block polymer has a melting point of 50° C. to 95° C.

Abstract: A toner that comprises a toner particle that contains a binder resin that contains a styrene-acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment; the polyester segment is obtained by condensation polymerization of: a monomer (a) selected from a group consisting of a prescribed monomer group A; and a monomer (b) selected from a group consisting of a prescribed monomer group B, and the content in the polyester segment of the substructure originating with the monomer (b) as calculated from the following formula is from at least 1.0 mol % to not more than 30.0 mol %: {monomer (b) [mol]/(monomer (a) [mol]+monomer (b) [mol])}×100.

Abstract: The present invention relates to a toner having a toner particle containing a binder resin containing a styrene acrylic resin and a block polymer, wherein the block polymer has a polyester segment and a vinyl polymer segment and has a melting point of 55° C. to 90° C., the polyester segment has a specific structure and a solubility parameter (SP) value of 9.40 to 9.85, and the vinyl polymer segment has a weight-average molecular weight (Mw) of 4000 to 15000.

Abstract: A toner containing a toner particle containing a binder resin, wherein the binder resin contains a styrene-acrylic resin and a crystalline resin, and the crystalline resin is a block polymer or a graft polymer in which the mass ratio between the crystalline segment and an amorphous segment is 30:70 to 90:10, and wherein, in the total heat flow measured for the binder resin by a temperature-modulated differential scanning calorimeter, the peak temperature of an endothermic peak is from 55.0° C. to 90.0° C., and the percentage of the endothermic quantity of the endothermic peak in the reversing heat flow with respect to the endothermic quantity of the endothermic peak in the total heat flow is from 0.0% to 35.0%.