The present invention provides a toner that includes a charge control agent containing one or two or more resorcin derivatives represented by the following formula (1), a colorant, and a binder resin. ##STR00001##

An electrostatic latent image developing toner contains a plurality of toner particles. Each of the toner particles contains, in a surface portion thereof, at least one hydrophobic salt in a state where a cation derived from a first surfactant is ionically bonded to an anion derived from a second surfactant. A ratio of a total mass of the at least one hydrophobic salt to a mass of the toner is 1 ppm or more and 5,000 ppm or less.

The invention provides metal oxide particles surface-treated with at least one alkoxysilane compound, methods of making such, and toners comprising same.

This invention provides metal oxide particles surface-treated with a hydrophobicity-imparting agent, methods of making such, and toner compositions comprising the same.

Provided are a process cartridge and an image-forming method each of which has a satisfactory cleaning property even at the initial stage of the use of a brand-new process cartridge or electrophotographic apparatus, and hence can suppress a reduction in image quality due to the contamination of a charging member. The charge transporting layer of an electrophotographic photosensitive member contains a specific polyarylate resin or polycarbonate resin, and a toner contains a specific fine particle on the surface of a toner particle.

Provided are a process cartridge and an image-forming method each of which has a satisfactory cleaning property even at the initial stage of the use of a brand-new process cartridge or electrophotographic apparatus, and hence can suppress a reduction in image quality due to the contamination of a charging member. The charge transporting layer of an electrophotographic photosensitive member contains a specific polyarylate resin or polycarbonate resin, and a toner contains a specific fine particle on the surface of a toner particle.

The present disclosure relates to a system for electrostatic printing. The system comprises a UV colorant comprising a rare earth diketonate, a thermoplastic resin and an additive selected from at least one of an acid having a pKa of 1 to 5 and a hydroxide. The system may be used to print a security feature on a print substrate.

A process cartridge includes a photosensitive member, a toner, and a developing roller, a surface layer of the photosensitive member has a Martens hardness of 245 to 300 N/mm.sup.2, the developing roller has a single-layered surface layer containing a substrate and a binder resin; when an elastic modulus of the binder resin in a first region is E1, and an elastic modulus of the binder resin in a second region is E2, E1200 MPa and 10 MPaE2150 MPa are satisfied; the elastic modulus in the second region continuously decreases from that in the first region; the toner comprises a toner particle and an external additive A; the external additive A is a silica particle having a major diameter of 40 to 400 nm; and a coverage of the external additive A with respect to surface of the toner particle is 5.0% or more.

Pressure-responsive particles include pressure-responsive base particles and resin particles, in which the pressure-responsive base particles contain a styrene-based resin that contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin that contains at least two kinds of (meth)acrylic acid esters as polymerization components, a ratio of a mass of the (meth)acrylic acid esters to a total mass of polymerization components is 90% by mass or more in the (meth)acrylic acid ester-based resin, the pressure-responsive particles have at least two glass transition temperatures, a difference between a lowest glass transition temperature and a highest glass transition temperature is 30 C. or higher, and a ratio of a mass of the resin particles to a total mass of the pressure-responsive particles is 0.05% by mass or more and 2.0% by mass or less.

An electrostatic image development toner containing an amorphous resin and a crystalline resin as binder resins. The amorphous resin contains an amorphous polyester resin (A) that is a polycondensate of an alcohol component (a) containing 80 mol % or more of an aliphatic diol (a1) and a carboxylic acid component (b), the alcohol component (a) contains 60 mol % or more of an aliphatic diol (a2) having 5 or 6 carbon atoms and having an alkyl group on a side chain, and the crystalline resin contains a crystalline polyester resin (C) that is a polycondensate of an aliphatic alcohol (c) and a carboxylic acid component (d).