A toner having: a toner particle including a binder resin; and an inorganic fine particle, wherein the inorganic fine particle includes a calcium strontium zirconate fine particle.

The magenta toner for developing electrostatic images includes colored resin particles containing a binder resin and a magenta colorant, and an external additive. A volume average particle diameter of the colored resin particles is from 5.5 m to 7.0 m. The external additive contains silica particles. The silica particles contain at least silica particles A having a number average particle diameter of from 5 nm to 30 nm and silica particles B having a number average particle diameter of from 31 nm to 100 nm; wherein a total content of the silica particles is from 0.5 part by mass to 4.5 parts by mass, with respect to 100 parts by mass of the colored resin particles. A liberation rate of the silica particles calculated by a specific liberation rate measuring method is in a range of from 2.2% to 9.5%.

Provided is an image recording composition used for an electrostatic image developing toner or an ink-jet ink, containing a photoisomerization compound which is a stilbene derivative having a structure represented by Formula (1), ##STR00001##
wherein R.sub.1 represents an electron donating group; R.sub.2 represents an electron withdrawing group; R.sub.3 to R.sub.10 each independently represent a hydrogen atom or an alkyl group which may have a branch, provided that at least one of R.sub.3 to R.sub.10 represents an alkyl group which may have a branch.

To provide a toner for electrophotography exhibiting an excellent charge rise property, and a process for producing the same. [1] A toner for electrophotography containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin, and [2] a process for producing a toner for electrophotography, including: melt-kneading a toner raw material mixture containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin; and pulverizing a resulting melt-kneaded material.

A toner includes toner particles each including a toner mother particle and an external additive adhering to a surface of the toner mother particle. The external additive includes silica particles. The silica particles each include a silica base, a first surface treatment layer covering the silica base, and a second surface treatment layer covering the first surface treatment layer. The first surface treatment layer contains a carboxy-modified silicone oil. The second surface treatment layer contains a specific copolymer including a first repeating unit represented by general formula (I) shown below and a second repeating unit represented by general formula (II) shown below. ##STR00001##
The silica particles have a non-ring-opened oxazoline group content of at least 1 mol/g and no greater than 500 mol/g as measured by gas chromatography-mass spectrometry.

A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.010.sup.4 N, of from 200 MPa to 1,100 MPa.

A toner comprising a toner particle that contains a toner base particle and an organosilicon polymer on a surface of the toner base particle, wherein the organosilicon polymer forms protruded portions with a prescribed structure on the surface of the toner base particle, and in the toner cross section, when the protrusion width w is the length of the segment where a protruded portion and the toner base particle form a continuous interface, the protrusion diameter D is the maximum length of a protruded portion, and the protrusion height H is the length from the peak of the protruded portion to the line along the circumference of the toner base particle surface, the numerical proportion of these protruded portions having a ratio D/w of the protrusion diameter D to the protrusion width w from 0.33 to 0.80, is a least 70 number %.

An image forming apparatus includes an image carrying unit that carries a toner image on a surface of the image carrying unit along with rotation of the image carrying unit to transfer the toner image onto a target transfer unit, and a supply unit that supplies a larger amount of fatty acid metal salt to the image carrying unit as a rotation speed of the image carrying unit increases.

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.

The present invention is to provide a toner for developing electrostatic images, which has an excellent balance between low-temperature fixability and heat-resistant shelf stability, which has good toner conveyance amount stability and printing durability, and which has less occurrence of fog in a high temperature and high humidity environment. Disclosed is a toner for developing electrostatic images, comprising colored resin particles containing a binder resin and a colorant, and an external additive, wherein the toner comprises, as the external additive, fine silica particles in an amount of 0.5 to 3.0 parts by mass with respect to 100 parts by mass of the colored resin particles, the fine silica particles having a hydrophobicity of 15 to 49% that is determined after a high-temperature and high-humidity incubation.