The toner for developing electrostatic images comprises colored resin particles comprising a binder resin, a colorant, a charge control resin and a softening agent, and an external additive, wherein the charge control resin is a copolymer having a composition in which a content ratio of a methyl methacrylate monomer unit is from 85.0 to 99.7% by mass; a content ratio of a quaternary ammonium salt group-containing (meth)acrylate monomer unit is from 0.3 to 15.0% by mass; and a content ratio of a vinyl-based monomer unit other than the methyl methacrylate monomer unit and the quaternary ammonium salt group-containing (meth)acrylate monomer unit, is from 0 to 14.7% by mass, and wherein a content ratio of the charge control resin is from 0.2 to 4.0 parts by mass, with respect to 100 parts by mass of the binder resin.

A positively chargeable toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particle includes a polyester resin having an acid value of at least 10.0 mgKOH/g, a compound having a quaternary ammonium cation group, and strontium titanate particles. The external additive includes no strontium titanate particles.

A toner is provided. The toner comprises a binder resin, a metal-containing azo dye, and a quaternary ammonium salt, has an average circularity of from 0.85 to 0.95, and is free of a tin compound having SnC bond.

Provided is a positive-charging toner having a toner particle that contains a binder resin, the binder resin contains a polymer A having a first monomer unit derived from a first polymerizable monomer, and a second monomer unit derived from a second polymerizable monomer, the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylic acid esters having a C18 to C36 alkyl group, the content of the first monomer unit in the polymer A is 5.0 to 60.0 mol % and the content of the second monomer unit is 20.0 to 95.0 mol %, SP.sub.11 of the first monomer unit and SP.sub.21 of the second monomer unit satisfy 3.00(SP.sub.21SP.sub.11)25.00, and the work function of the toner is 5.0 to 5.4 V.

Provided is toner which has good low-temperature fixability, shelf stability and hot offset resistance, and which suppresses a decrease in glossiness of an image. The toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive, wherein a glass transition temperature (Tg) specified from a temperature dependence curve of a loss tangent (tan ?) obtained by dynamic viscoelastic measurement of the toner, is 50? C. or more and less than 90? C.; the loss tangent (tan ?) at the glass transition temperature (Tg) is 1.70 or less; in a temperature range of 90? C. or more and 160? C. or less, a lowest temperature (Ta) with a loss tangent of 1.50 is more than 95? C. and less than 145? C.; and a storage elastic modulus (G) at the lowest temperature (Ta) is less than 56000 Pa.

A toner for electrostatic image development includes: toner particles; perovskite compound particles externally added to the toner particles; and silica particles (S) that are externally added to the toner particles and include an elemental nitrogen-containing compound containing elemental molybdenum and in which the ratio N.sub.Mo/N.sub.Si of a Net intensity N.sub.Mo of elemental molybdenum that is measured by X-ray fluorescence analysis to a Net intensity N.sub.Si of elemental silicon that is measured by the X-ray fluorescence analysis is from 0.035 to 0.45 inclusive.

Disclosed is a method for producing a toner comprising combining a binder resin, a wax, a negatively-chargeable charge control resin and a colorant to form the toner, prior to said combining, the negatively-chargeable charge control resin is obtained by drying treatment conducted for 2 to 24 hours under conditions of a drying temperature of 45 to 80 C. and a pressure of 0.5 to 20 kPa, wherein the negatively-chargeable charge control resin comprises a monomer unit having a functional group that imparts a negative charging property, a vinyl aromatic hydrocarbon monomer unit, and a (meth)acrylate monomer unit.

A toner includes a plurality of toner particles and a plurality of lubricant particles. The lubricant particles each include a core and a coat layer covering a surface of the core. The core contains stearic acid, palmitic acid, or a combination thereof. The coat layer has a thickness of at least 10 nm and no greater than 50 nm.

Provided is a toner that is excellent in heat-resistant shelf stability and low-temperature fixability, has durability, and causes less occurrence of fogging in high temperature and high humidity environments. The toner comprising at least a binder resin, a colorant, a release agent, a retention aid and a charge control resin. The binder resin is a copolymer containing a styrene-based monomer unit 67 to 78% by mass and a (meth)acrylic acid alkyl monomer unit 22 to 33% by mass. The content of the retention aid is 1 to 4 parts by mass with respect to 100 parts by mass of the binder resin, and the content of the charge control resin is 0.1 to 20 parts by mass with respect to 100 parts by mass of the binder resin.

A positively chargeable toner includes a plurality of toner particles each including a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant is attached and second resin particles each having a surface to which a cationic surfactant is attached. The first resin particles have a hydrophobicity of at least 15% and no greater than 30%. The second resin particles have a hydrophobicity of at least 50% and no greater than 80%. A first resin particle coverage ratio and a second resin particle coverage ratio each are at least 10% and no greater than 30%. Each blocking rate of the first resin particles and the second resin particles is no greater than 30% by mass.