Konica Minolta Business Technologies, Inc.

Noriyuki Kinpara

Kenji Hayashi

Hiroaki Obata

Yasuhiko Muramatsu

Mikio Kouyama

Hiroshi Nagasawa

Mikio Koyama

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.

Toner manufacturing method

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):&#x2014;XYX&#x2014;[wherein in the formula, Xdenotes a linking group; and Ydenotes 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].

Toner and toner manufacturing method

Disclosed is a toner including: a resin; coloring agent and release agent including compound or compounds represented by the following general formula (1): R&#x2014;(COO&#x2014;R), wherein Ris 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 Ris 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, Rwith carbon number of N is 80 to 97 percent by mass, Rwith carbon number of (N-2) is 0.0 to 7.8 percent by mass, Rwith carbon number of (N-4) is 3.0 to 13.0 percent by mass, Rwith carbon number of (N-4) is included 1.5 percent by mass or more than Rwith carbon number of (N-2).

Toner

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), Rto Rrespectively denote a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group containing a fluorine atom, provided that at least one of Rto Rdenotes a chlorine atom]. [In general formula (2), Rto Rrespectively denote a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; Rand Rrespectively denote a hydrogen atom, or an alkyl group having 1 to 2 carbon atoms; Rdenotes a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; m denotes a number of 1 or 2; Adenotes a chlorine ion or a sulfonic acid compound ion; and n denotes a number of 1 or 2.

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Tokyo, Japan

Noriyuki Kinpara