Abstract: A developing device, includes: a developing sleeve supported rotatably, the developing sleeve having a hollow, substantially cylindrical shape; a magnet part having a substantially columnar shape, the magnet part having magnetic poles disposed side by side around an axis, the magnet part being disposed substantially coaxially with the developing sleeve inside the developing sleeve; a rod fastened to the magnet part, the rod extending from one end in an extending direction of the axis of the magnet part, the rod being pulled out from one axial end of the developing sleeve; and a holder attached to a portion of the rod pulled out from the developing sleeve, the holder being fastened to a fastening target, the holder maintaining the rod, the holder regulating rotation of the magnet part, wherein adjustment of the holder in fastening position enables disposition and holding of the rod at an optional position.

Abstract: Disclosed is a toner manufacturing method, comprising: dispersing a polyester resin prepared by condensing a polyol and a polycarboxylic acid into an aqueous medium and adjusting a polyester resin particle dispersion liquid, wherein the polyol includes an unsaturated polyol, or the polycarboxylic acid includes an unsaturated polycarboxylic acid; and adding a radical polymerization initiator to the polyester resin particle dispersion liquid to cause a radical polymerization reaction, and adjusting the obtained dispersion liquid of polyester resin particles.

Abstract: Disclosed is a toner comprising at least a resin and a coloring agent, wherein the resin comprises toner particles in which a polyester resin unit is cross-linked by a diatomic cross-linking group expressed by a following general formula (1): —X1Y1X1— [wherein in the formula, X1 denotes a linking group; and Y1 denotes a radical polymer unit having a number average molecular weight Mn ranging from 5000 or more to 50000 or less, and a ratio Mw/Mn ranging from 1.0 or more to 1.2 or less, wherein Mw denotes a weight average molecular weight, and Mn denotes the number average molecular weight].

Abstract: Disclosed is a toner including: a resin; coloring agent and release agent including compound or compounds represented by the following general formula (1): R1—(COO—R2)n, wherein R1 is a linking group having carbon number of 2 to 8 which may be a cyclic structure and may have a hydroxy group or fatty acid ester group; and each R2 is an alkyl group having carbon number of N, (N-2) or (N-4) independently, N is a natural number from 10 to 30, and n is a natural number from 3 to 4, R2 with carbon number of N is 80 to 97 percent by mass, R2 with carbon number of (N-2) is 0.0 to 7.8 percent by mass, R2 with carbon number of (N-4) is 3.0 to 13.0 percent by mass, R2 with carbon number of (N-4) is included 1.5 percent by mass or more than R2 with carbon number of (N-2).

Abstract: The object aims to improve the reproducibility of color and the stability in density of a toner. Disclosed is a toner comprising at least a resin and a colorant, wherein the colorant comprises a compound represented by general formula (1) and a compound represented by general formula (2). [In general formula (1), R1 to R8 respectively denote a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group containing a fluorine atom, provided that at least one of R1 to R8 denotes a chlorine atom]. [In general formula (2), R1 to R4 respectively denote a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; R5 and R6 respectively denote a hydrogen atom, or an alkyl group having 1 to 2 carbon atoms; R7 denotes a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; m denotes a number of 1 or 2; An? denotes a chlorine ion or a sulfonic acid compound ion; and n denotes a number of 1 or 2.

Abstract: Disclosed is a toner manufacturing method, comprising: dispersing a polyester resin prepared by condensing a polyol and a polycarboxylic acid into an aqueous medium and adjusting a polyester resin particle dispersion liquid, wherein the polyol includes an unsaturated polyol, or the polycarboxylic acid includes an unsaturated polycarboxylic acid; and adding a radical polymerization initiator to the polyester resin particle dispersion liquid to cause a radical polymerization reaction, and adjusting the obtained dispersion liquid of polyester resin particles.

Abstract: Disclosed is a toner manufacturing method, comprising: dispersing a polyester resin prepared by condensing a polyol and an unsaturated polycarboxylic acid into an aqueous medium and preparing a polyester resin particle dispersion liquid; adding a vinyl polymerizable monomer and a radical polymerization initiator to the polyester resin particle dispersion liquid to cause a radical polymerization reaction, followed by preparing a dispersion liquid of resin particles made of a resin in which vinyl polymerizable monomers react with the polyester resin; and mixing at least the resin particles made of the resin in which the vinyl polymerizable monomers react with the polyester resin, and a dispersion liquid of coloring agent particles, and forming toner particles by making the resin particles and the coloring agent particles cohere.

Abstract: Disclosed is a toner comprising at least a resin and a coloring agent, wherein the resin comprises toner particles in which a polyester resin unit is cross-linked by a diatomic cross-linking group expressed by a following general formula (1): —X1?Y1?X1— [wherein in the formula, X1 denotes a linking group; and Y1 denotes a radical polymer unit having a number average molecular weight Mn ranging from 5000 or more to 50000 or less, and a ratio Mw/Mn ranging from 1.0 or more to 1.2 or less, wherein Mw denotes a weight average molecular weight, and Mn denotes the number average molecular weight].

Abstract: The object aims to improve the reproducibility of color and the stability in density of a toner. Disclosed is a toner comprising at least a resin and a colorant, wherein the colorant comprises a compound represented by general formula (1) and a compound represented by general formula (2). [In general formula (1), R1 to R8 respectively denote a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group containing a fluorine atom, provided that at least one of R1 to R8 denotes a chlorine atom.] [In general formula (2), R1 to R4 respectively denote a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; R5 and R6 respectively denote a hydrogen atom, or an alkyl group having 1 to 2 carbon atoms; R7 denotes a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; m denotes a number of 1 or 2; An? denotes a chlorine ion or a sulfonic acid compound ion; and n denotes a number of 1 or 2.

Abstract: Disclosed is a toner including: a resin; coloring agent and release agent including compound or compounds represented by the following general formula (1): R1—(COO—R2)n, wherein R1 is a linking group having carbon number of 2 to 8 which may be a cyclic structure and may have a hydroxy group or fatty acid ester group; and each R2 is an alkyl group having carbon number of N, (N-2) or (N-4) independently, N is a natural number from 10 to 30, and n is a natural number from 3 to 4, R2 with carbon number of N is 80 to 97 percent by mass, R2 with carbon number of (N-2) is 0.0 to 7.8 percent by mass, R2 with carbon number of (N-4) is 3.0 to 13.0 percent by mass, R2 with carbon number of (N-4) is included 1.5 percent by mass or more than R2 with carbon number of (N-2).