Abstract: An electrophotographic photoreceptor includes a conductive substrate and a single-layer photosensitive layer which is provided on the conductive substrate and contains a binder resin, at least one charge generating material selected from a hydroxygallium phthalocyanine pigment and a chlorogallium phthalocyanine pigment, a first electron transporting material defined in the specification, a second electron transporting material defined in the specification, and a hole transporting material defined in the specification, wherein a total content of all electron transporting materials is greater than or equal to 4 parts by weight with respect to 100 parts by weight of a total solid content of the photosensitive layer, and an average loss elastic modulus E? of the photosensitive layer, which is obtained by measuring dynamic viscoelasticity at a temperature of from 35° C. to 50° C. and a frequency of 0.5 Hz, is less than or equal to 1.000×106.

Abstract: A surface layer of the electrophotographic photosensitive member has a change region in which a ratio of the number of carbon atoms with respect to the sum of the number of silicon atoms and the number of carbon atoms gradually increases toward a surface side of the electrophotographic photosensitive member from a photoconductive layer side, wherein the change region has an upper charge injection prohibiting portion containing a Group 13 atom, and a surface-side portion which is positioned closer to the surface side of the electrophotographic photosensitive member than the upper charge injection prohibiting portion and does not contain the Group 13 atom, and the distribution of the Group 13 atom in a boundary portion between the surface-side portion and the upper charge injection prohibiting portion is precipitous.

Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a single-layer type photosensitive layer that contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, wherein a content of the charge generating material in the photosensitive layer is 0.5% by weight or more and less than 2.0% by weight and the charge generating material satisfies expression (1): 30?a/b, wherein a represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the surface side of the film thickness of the photosensitive layer to a point corresponding to ?, and b represents the number of the charge generating materials per unit cross-sectional area in a region ranging from the conductive substrate side of the film thickness of the photosensitive layer to a position corresponding to ?, provided that a case where b is 0 is included.

Abstract: A solution of a gallium phthalocyanine contains a compound of formula (1) and a gallium phthalocyanine of formula (2), H2N—CH2—R1—CH2—NH2??(1) wherein R1 represents a single bond, or a substituted or unsubstituted alkylene group having 1 to 10 main-chain carbon atoms, a substituent of the substituted alkylene group is an alkyl group having 1 to 3 carbon atoms, an alkyl group having 1 to 3 carbon atoms and being substituted with an amino group, or a hydroxy group, one of the carbon atoms in the main chain of the alkylene group may be replaced with an oxygen atom, a sulfur atom, or a bivalent group represented by the formula —NR2—, and R2 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or an alkyl group having 1 to 3 carbon atoms and being substituted with an amino group, and wherein X1 represents a chlorine atom or hydroxy group.

Abstract: An electrostatic charge image developing toner includes a toner particles containing a binder resin and a metallic pigment and aliphatic acid metal salt particles as an external additive in an amount of from 0.1 parts by weight to 2.0 parts by weight with respect to 100 parts by weight of the toner particles, wherein the toner particles have an average circle equivalent diameter D longer than an average C of a maximum thickness of the toner particles.

Abstract: Provided is a toner for electrostatic charge image development which satisfies both low temperature fixability and an excellent storage stability and realizes excellent chargeability, fixing separation property, and flowability. According to the present invention, there is provided a toner for electrostatic charge image development comprising toner particles which comprises a binder resin including a crystalline polyester resin and a release agent, in which the crystalline polyester resin has a lamellar structure and the lamellar structure is present only on the inside of the toner particle when a cross-section of the toner particle subjected to ruthenium staining is observed with a transmission electron microscope.

Abstract: An electrostatic charge image developing toner includes a toner particle including a binder resin containing a polyester resin, a release agent containing hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent of the entire release agent is present in a portion within 800 nm from the surface of the toner particle, and wherein the styrene (meth)acrylic resin forms a domain having an average diameter of smaller than 0.3 ?m in the toner particle.

Abstract: An electrostatic charge image developing toner includes a toner particle containing a binder resin, a release agent, and an inorganic mineral, wherein 80% or more of the entire release agent is present in a portion within 400 nm from the surface of the toner particle and 80% or more of the entire inorganic mineral is present in a portion within 400 nm from the surface of the toner particle.

Abstract: An electrostatic charge image developing toner includes a binder resin, a colorant, and 4-nitro-o-anisidine, wherein the colorant contains a compound represented by the following formula (I), a content of the colorant in the toner is from 1.0% by weight to 20.0% by weight, and a content of 4-nitro-o-anisidine in the toner is from 0.1 ppm to 1,000 ppm based on the weight: wherein R represents an organic group.

Abstract: An embodiment of the present invention relates to a polymeric dispersant for a liquid developer, which is obtained by copolymerizing at least an ethylenically unsaturated monomer having an amino group, an ethylenically unsaturated monomer having an alkyl group with a carbon number of 9 to 24, and an ethylenically unsaturated monomer represented by general formula (1) shown below: CH2?C(R1)COO(AO)nR2??General formula (1) wherein, R1 represents H or CH3, R2 represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 22, n represents an integer of 1 to 200, and A represents an alkylene group having a carbon number of 2 to 4.

Abstract: An electrostatic latent image developing toner includes toner particles that each include a toner core and a shell layer disposed over a surface of the toner core. The shell layer contains a first shell resin and a second shell resin. The first shell resin is a hydrophilic thermoplastic resin, a hydrophobic thermoplastic resin, or a hydrophobic thermosetting resin. The second shell resin is a hydrophilic thermosetting resin. The first shell resin includes a repeating unit having an alcoholic hydroxyl group.

Abstract: A photoconductor, including an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide and a binder resin, and has a WRa (LLH) less than 0.12 ?m and WRa (LHH) of from 0.03 to 0.2 ?m in a curve.

Abstract: Methods of Printing and Electrostatic Ink Compositions Herein are disclosed electrostatic ink compositions, methods of printing and printed substrates. In some examples, the electrostatic ink composition comprises a carrier liquid, particles comprising a graft co-polymer comprising an acrylate polymer backbone onto which has been grafted polysiloxane side chains, wherein the particles are dispersed in the carrier liquid.

Abstract: An electrophotographic photosensitive member includes a support and a photosensitive layer on the support, and the photosensitive layer contains a hydroxygallium phthalocyanine crystal having peaks at Bragg angles 2?±0.2° of 6.9°, 7.7°, 16.4°, 24.4°, and 26.5° in CuK? X-ray diffraction.

Abstract: An electrostatic latent image developing toner includes toner particles. Each toner particle includes a toner core containing a binder resin, a shell layer coating a surface of the toner core, and needle-like inorganic particulates. Each shell layer contains a thermosetting resin, and the inorganic particulates are present within the shell layer. The inorganic particulates have: an aspect ratio of 1.25 or more and 2.5 or less; and an average major diameter and an average minor diameter of 300 nm or less.

Abstract: An improved overcoat layer for an organic photoconductor drum of an electrophotographic image forming device is provided. The overcoat layer is prepared from a curable composition including a triphenylamine charge transport containing two ethyl acrylate functional groups and a urethane resin containing six radical polymerizable functional groups. The amount of the triphenylamine charge transport containing two ethyl acrylate functional groups in the curable composition is about 20 to about 80 percent by weight. The amount of the urethane resin containing six radical polymerizable functional groups in the curable composition is about 20 to about 80 percent by weight. This overcoat layer improves wear resistance of the organic photoconductor drum without negatively altering the electrophotographic properties, thus protecting the organic photoconductor drum from damage and ultimately providing a photoconductor with a longer useful life when compared to other organic photoconductors commercially available.

Abstract: An organic photoconductor including an electrically conductive substrate, a photosensitive layer disposed on the electrically conductive substrate, and a protection layer disposed on the photosensitive layer, wherein the protection layer includes a polymer composition and a plurality of electrically conductive metal oxide particles, and wherein the polymer composition is a product of a curing reaction with a multifunctional spherical dendrimer, a first multifunctional acryl compound having a urethane bond, and a second multifunctional acryl compound having a silicon-containing group and a fluorine-containing group.

Abstract: There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 ?m, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 ?m. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.

Abstract: The present invention relates to an electrophotographic photoreceptor comprising an electroconductive support and at least a photosensitive layer formed on the support, wherein the photosensitive layer contains a specific charge transport substance.

Abstract: An electrophotographic photosensitive member, comprising a support, a charge generating layer on the support and a charge transporting layer on the charge generating layer, wherein the charge generating layer comprises a gallium phthalocyanine crystal, a nitrogen-containing heterocyclic compound and a compound represented by Formula (1), wherein a nitrogen atom in a heterocyclic ring of the nitrogen-containing heterocyclic compound has a substituent.