A toner comprising a toner particle containing a pigment, a resin A and a resin B, wherein the pigment is a pigment having a structure derived from a basic compound, the resin A has an acidic functional group, the resin B has an acid value of at least 2.0 mg KOH/g, the resin B has a glass transition temperature TgB of at least 50° C., and the hydrophobic parameter HPA of the resin A and the hydrophobic parameter of the resin B satisfy the following formulae:

HPA≧0.60

HPB≦0.70

HPA−HPB>0.

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.

A toner comprising a toner particle comprising a resin A, and an external additive A, wherein the resin A is a resin represented by formula (1) below, the resin A is present at the surface of the toner particle, the external additive A is a fine particle containing silicon, the average value of the shape factor SF-1 of the external additive A is from 105 to 120, the average value of the shape factor SF-2 of the external additive A is from 100 to 130.

##STR00001##

A negative-charging toner comprising a toner particle comprising a binder resin and an organic-inorganic composite fine particle comprising resin fine particles and inorganic fine particles A, wherein the organic-inorganic composite fine particle is negative charging, the organic-inorganic composite fine particle has a structure in which at least a part of the inorganic fine particle A is embedded in the resin fine particle, a number average particle diameter Db of the organic-inorganic composite fine particle is 50 to 350 nm, and a plurality of convex portions derived from the inorganic fine particles A are present on the surface of the organic-inorganic composite fine particle.

The present invention relates to a binder resin composition capable of giving a toner remarkably excellent in fusing property on polypropylene films, and to a toner for developing electrostatic images that contains the binder resin composition. [1] A binder resin composition for toners, containing an amorphous polyester resin which has a polyester resin-derived constituent moiety that is a constituent moiety derived from a polyester resin and a modified polypropylene polymer A-derived constituent moiety that is a constituent moiety derived from a modified polypropylene polymer A having a carboxylic acid group or a carboxylic anhydride group and in which the polyester resin-derived constituent moiety and the modified polypropylene polymer A-derived constituent moiety bond to each other via a covalent bond, wherein the polymer A is a polypropylene polymer terminally-modified with an unsaturated bond-having carboxylic acid compound or an anhydride thereof, and in the polyester resin, the amount of the polymer A-derived constituent unit is 8 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the total of the alcohol component and the carboxylic acid component constituting the polyester resin-derived constituent moiety; and [2] a toner for developing electrostatic images, containing the binder resin composition of [1].

A water dispersible sulfo-polyamide is configured as a filament for use as an extrudable support material in the additive manufacture of a part comprising a non water dispersible polymer. The water dispersible sulfo-polyamide is a reaction product of a sulfo monomer, the water dispersible sulfo-polymer being dispersible in water resulting in separation of the water dispersible polymer from the part comprising the non water dispersible polymer.

A toner comprising a toner particle, wherein the toner particle comprises a binder resin, a resin A, and a resin B, the resin A comprises a substituted or unsubstituted silyl group in a molecule, a substituent of the substituted silyl group is at least one selected from the group consisting of an alkyl group having 1 or more carbon atoms, an alkoxy group having 1 or more carbon atoms, a hydroxy group, a halogen atom, and an aryl group having 6 or more carbon atoms, and the resin B comprises an azo group in a molecule.

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 μS/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.

A toner comprising a toner particle comprising a binder resin and a crystalline resin, wherein the binder resin comprises an amorphous resin, when the toner is measured with a temperature-modulated differential scanning calorimeter, at least one endothermic peak derived from the crystalline resin is present in a temperature range from 55.0° C. to 95.0° C. in a total heat flow; and a ratio of an endothermic quantity of the endothermic peak in a reversing heat flow to an endothermic quantity of the endothermic peak in the total heat flow is 50.0% or more, a glass transition temperature Tg1st obtained in the reversing heat flow in a first temperature rise and a glass transition temperature Tg2nd obtained in a reversing heat flow in a second temperature rise satisfy Tg1st−Tg2nd≥7.0° C.

Toners are provided which may comprise toner particles, a colorant, and optionally, a wax, wherein the toner particles comprise a resin comprising a polymerization product of reactants comprising a dioxane/dioxolane monomer and a vinyl co-monomer, wherein the dioxane/dioxolane monomer is an ester of (meth)acrylic acid with an alcohol comprising a dioxane moiety, an ester of (meth)acrylic acid with an alcohol comprising a dioxolane moiety, or both.