Abstract: A toner, including: a binder resin; and a colorant, wherein the binder resin contains: a crystalline polyester resin (A); a non-crystalline resin (B); and a composite resin (C), where the composite resin (C) contains a condensation polymerization resin unit and an addition polymerization resin unit, wherein the toner contains chloroform insoluble matter in an amount of 1% by mass to 30% by mass, wherein the toner has a molecular weight distribution having a main peak in a range of 1,000 to 10,000 and a half width of 15,000 or less, where the molecular weight distribution is obtained through gel permeation chromatography (GPC) of tetrahydrofuran soluble matter of the toner, and wherein the toner has an endothermic peak in a range of 90° C. to 130° C. in measurement through differential scanning calorimetry (DSC).

Abstract: An electrostatic charge image developing toner includes a toner particle including a core particle containing a polyester resin and a coating layer containing a vinyl resin that coats the surface of the core particle, and an external additive that is formed of silica particles having an average circularity of from 0.75 to 0.9 and an average value of ratios of circle equivalent diameters Da obtained by a plane image analysis to the maximum height H obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.

Abstract: Two-component developer includes positively chargeable toner and a carrier. The carrier is formed of a carrier core and a coating layer that covers the carrier core. The coating layer includes one or more types of fluorine-containing resin selected from the group consisting of fluorine containing polyimide resin and fluorine containing polyamide-imide resin. The positively chargeable toner includes binder resin and a charge control agent. A content of the charge control agent is 1.0% by mass or higher and 5.0% by mass or lower relative to a mass of the toner.

Abstract: A polymerizable monomer is provided which is represented by the following formula (1): wherein R1 represents a hydrogen atom or an alkyl group; A represents —CO— or —SO2—; and the moiety represented by the formula (1) is, at the part shown by an asterisk *, linked to a moiety represented by the following formula (2), at any position of a, b, c or d thereof; wherein the sites among a, b, c and d at which the moiety represented by the formula (2) is not linked to the moiety represented by the formula (1) each has a hydrogen atom or a substituent selected from the group consisting of an alkyl group, an alkoxy group and a sulfonic acid group, or any of which may connect at mutually adjoining positions to form a ring.

Abstract: Toner contains a binder resin and a colorant, wherein the binder resin contains a resin having a polyhydroxy carboxylic acid skeleton, wherein the toner has a half effusion temperature of from 80° C. to 120° C. as measured by a temperature rising method using a flow tester.

Abstract: In a photoreceptor including an electroconductive substrate; a photosensitive layer; and a protective layer, the protective layer includes a crosslinked resin having a residual group of a polycarboxylic acid compound and a group having the below-mentioned formula (10), and at least one of a compound having the below-mentioned formula (2) and a compound having the below-mentioned formula (3). wherein each of R5 and R6 independently represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms. wherein each of R7 and R8 independently represents a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms, and Z1 represents a vinylene group, a divalent aromatic hydrocarbon group having 6 to 14 carbon atoms, or a 2,5-thiophenediyl group.

Abstract: A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 ?cm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.

Abstract: The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1, R2, R6 represent an alkyl group, R3 to R5 represent an alkyl group, or satisfy either of the following conditions i) and ii): i) R3, R4 are bonded to each other, so as to form a cyclic organic functional group, and R5 represents an alkyl group; ii) R3 to R5 are bonded to one another, so as to form a cyclic organic functional group R7, R8 represent an alkyl group or an acyl group, or R7, R8 are bonded to each other, so as to form a cyclic organic functional group.

Abstract: A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

Abstract: An electrostatic charge image developing toner includes a binder resin and a release agent, and when a peak temperature during a first temperature increase and a peak temperature during a second temperature increase, that are obtained by differential scanning calorimetry including performing the first temperature increase at 10° C./min after holding at 10° C., performing cooling at ?10° C./min, performing a heat treatment for 24 hours at 50° C., and performing the second temperature increase at 10° C./min, are represented by Tt1 and Tt2(50° C.), respectively, the following Expression (1) is satisfied: Tt1<Tt2(50° C.).

Abstract: A photoconductor that includes, for example, a supporting substrate, an optional anticurl layer, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, a photogenerating layer, a charge transport layer, and an optional protective coating, and where the photogenerating layer contains a polyarylatecarbonate.

Abstract: To provide a toner that can keep its melt-sticking to sleeve from occurring and, even in double-sided printing, can keep high-temperature offset from occurring and obtain high-quality images on both the surface and the back. The toner comprises toner particles each of which contains a binder resin containing a resin formed by the reaction of i) a resin (A) having a softening point TA (° C.) of 70° C. to 105° C. and having a peak top of endothermic peaks at 55° C. to 120° C. with ii) a resin (B) having a softening point TB (° C.) of 120° C. to 160° C. and having a peak top of endothermic peaks at 55° C. to 120° C., and, in its viscoelasticity characteristics, has a storage elastic modulus at temperature 180° C. (G?180) of 3.0×103 Pa to 3.0×104 Pa, where the loss tangent tan ? has at least one peak having a peak top within the range of 50° C. to 70° C. and, when peak top temperature of the peak is represented by T(° C.), the loss tangent at T+10(° C.) [tan ?(T+10)] is 1.0 to 1.

Abstract: A resin for use in toner is provided. The resin comprises an oligomer segment and a soft segment. The oligomer segment comprises a polyhydroxycarboxylic skeleton and an aromatic diol skeleton.

Abstract: An electrostatic charge image developing toner includes an amorphous polyester resin and a crystalline polyester resin as a binder resin, and by differential scanning calorimetry, which undergoes processes of a first temperature rise, cooling at a rate of ?10° C./min and a second temperature rise, an endothermic peak (1) derived from a resin in which at least the amorphous polyester resin and the crystalline polyester resin are compatible is present in the first temperature rise, an exothermic peak having an intensity of 0.1 J/g or more is not present during the first temperature rise, and at least one exothermic peak (2) is present in a temperature range which is lower than that of the endothermic peak (1) by from 5° C. to 15° C. during the second temperature rise.

Abstract: A toner is provided which is superior in the long-term storage stability and has high low-temperature fixing properties. In a DSC curve as measured with a differential scanning calorimeter, the toner has a glass transition temperature of not less than 50° C. and not more than 60° C.; and the toner has, in regard to a resin composition contained therein, a difference of not less than 0.060 W/g in heat flow between a point on the curve at a temperature of 40° C. and a baseline in the range exceeding the glass transition temperature; and in viscoelastic characteristics measured at a frequency of 6.28 rad/sec, the toner has a storage elastic modulus (G?40) at a temperature of 40° C. of not less than 7.0×108 Pa and not more than 2.0×109 Pa, and a storage elastic modulus (G?70) at a temperature of 70° C. of not less than 1.0×105 Pa and not more than 1.0×107 Pa.

Abstract: In an electrophotographic photosensitive member having a surface layer containing a polymer obtainable by polymerization of a compound having a chain-polymerizable functional group, the compound having a chain-polymerizable functional group includes a compound represented by formula (1).

Abstract: An electrophotographic toner including a binder, a colorant and a releasing agent, and a method of preparing the electrophotographic toner.

Abstract: The present invention provides a toner excellent in light resistance. The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1 and R2 each independently represent an alkyl group or an acyl group, or R1 and R2 may be bonded to each other so as to form a cyclic organic functional group containing, as a hetero atom, a nitrogen atom to which R1 and R2 are bonded; R3 and R4 each independently represent an alkyl group; R5 and R6 each independently represent an alkyl group or an alkoxy group; R7 represents a hydrogen atom, an alkyl group or an alkoxy group; and R8 represents an alkyl group.

Abstract: A liquid developer is obtained by dispersing toner particles containing at least a resin and a coloring agent in an insulating liquid. The toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. The coloring agent contains nigrosine. A content of nigrosine in the toner particles is not lower than 1 mass % and not higher than 20 mass %. The second resin satisfies Equations (1) to (2) below. In Equations (1) to (2), x represents a number average molecular weight of the second resin and y represents a urethane group concentration (mass %) in the second resin. ?0.00003x+2.03?y??0.00003x+6.

Abstract: An electrophotographic photosensitive member has a laminated body, and a hole transporting layer formed on the laminated body, wherein the laminated body is a laminated body having a conductive support, an electron transporting layer and a charge generating layer. When an impedance is measured by forming a circular-shaped gold electrode having a thickness of 300 nm and a diameter of 10 mm on a surface of the charge generating layer of the laminated body by sputtering, and applying an alternating electric field of 100 mV and 0.1 Hz between the conductive support and the gold electrode, the laminated body of the electrophotographic photosensitive member satisfies the following expression (1): R_opt/R_dark?0.