A process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including an electrophotographic photosensitive member, a toner, and a developing member that feeds the toner to the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member includes a surface layer containing a (meth)acrylic resin having a urethane structure, the toner includes a toner particle and a hydrotalcite particle as an external additive, and the hydrotalcite particle contains fluorine in filter fitting analysis in STEM-EDS analysis.

Provided is a process cartridge removably mountable onto a main body of an electrophotographic apparatus, the process cartridge comprising an electrophotographic photosensitive member, a toner, and a developing member configured to supply the toner to the electrophotographic photosensitive member, wherein, in filter fitting analysis in STEM-EDS analysis, a hydrotalcite particle comprises fluorine, and wherein, when a number-average primary particle diameter of a particle A is represented by “m” [nm], a content ratio of the particle A with respect to the surface layer is represented by “p” [vol %], and a number-average primary particle diameter of the hydrotalcite particle is represented by “h” [nm], the “m”, the “p”, and the “h” satisfy the following expressions, respectively:

5≤m≤300  Expression (1);

5≤p≤40  Expression (2); and

60≤h≤1,000  Expression (3).

The toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive. The colored resin particles further comprise a styrene-based thermoplastic elastomer. The styrene-based thermoplastic elastomer comprises an isoprene unit. A content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.

Provided is a wax which is used in a toner, whereby the toner is excellent in low-temperature fixability and heat-resistant shelf stability, the glossiness is improved as compared with the prior art, and the generation of ultrafine particles and the bleeding of the wax are not likely to occur. The wax for toners, wherein the wax is an ester wax generated by esterification of a pentaerythritol and a monocarboxylic acid; wherein the monocarboxylic acid used for the esterification contains a behenic acid, an arachidic acid and a stearic acid; and wherein, with respect to 100% by mass of the monocarboxylic acid, a content ratio of the behenic acid is from 60% by mass to 80% by mass; a content ratio of the arachidic acid is from 5% by mass to 15% by mass; and a content ratio of the stearic acid is from 15% by mass to 25% by mass.

[Summary] An object of the present invention is to provide a toner that has both low-temperature fixability and heat-resistant storage stability, suppresses contamination of cleaning parts and photoconductors, and has excellent charging stability.

[Tasks] A toner includes toner based particles containing a binder resin, a colorant, and a wax; and fine resin particles and an inorganic external additive that are present on a surface of the toner based particles, wherein a coverage of the fine resin particles is in a range from 30% to 70%, and wherein the inorganic external additive covers a surface of oxide of a metal element with hydroxide of a metal element.

An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, an average thickness of the resin layer is 0.6 μm or more and 1.4 μm or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.

A carrier for a developer includes carrier particles. The carrier particles have a sea island structure including a sea portion and an island portion on the surface. The island portion contains a nitrogen-containing silicone resin. The sea portion contains a nitrogen-free silicone resin. The area ratio of the island portion in the total area of the surface of the carrier particle is 20% or more and 40% or less.

A two-component developer 100 includes a carrier 200 and a toner 300. The carrier 200 satisfies the relationships 100≤α≤220 and 300≤β≤480 when a voltage is applied in 1 V steps by a bridge resistance measurement method, where α (V) is a carrier voltage value obtained when a current value flowing through the carrier 200 reaches 1.0.sup.−7 (A), and β (V) is a carrier voltage value obtained when the current value reaches 1.0.sup.−5 (A).

The present disclosure provides a resin particle including a binder resin, in which the binder resin contains a biomass-derived resin and a recycled resin, and a content (% by mass) of the biomass-derived resin and a content (% by mass) of the recycled resin in the binder resin satisfy the following relational equation (1): Content of recycled resin >Content of biomass-derived resin.

A toner is provided, which has a toner particle that contains a binder resin, and organosilicon polymer particle on a surface of the toner particle. A methanol concentration a (vol %) of the organosilicon polymer particle in a wettability test and a methanol concentration b (vol %) of the toner particle in a wettability test satisfy Expression (I) below:
|a−b|≤25  (I), and an adhesion index of the organosilicon polymer particle on a polycarbonate film, calculated on the basis of Expression (II) below, is not more than 3.5:
Adhesion index=area ratio c of the organosilicon polymer particle having migrated to the polycarbonate film/coverage ratio d of the organosilicon polymer particle on the surface of the toner particle×100  (II).