公开(公告)号：US20200319569A1

公开(公告)日：2020-10-08

申请号：US16907738

申请日：2020-06-22

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/09 ,  G03G9/08 ,  G03G9/087

Abstract: The magenta toner is excellent in image density, has an enhanced chargeability, and can be produced at a low cost. The magenta toner includes a binder resin and a magenta colorant. A compound A represented by the following general formula (1) and C.I. Solvent Violet 59 are contained as the magenta colorant.

公开(公告)号：US10732533B2

公开(公告)日：2020-08-04

申请号：US16319932

申请日：2017-07-24

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/09 ,  G03G9/08 ,  G03G9/087

Abstract: Provided is a magenta toner, which is excellent in image density, has an enhanced chargeability, and can be produced at a low cost. The magenta toner comprising a binder resin and a magenta colorant, wherein a compound A represented by the general formula (1) and a compound B represented by the general formula (2) are contained as the magenta colorant, and wherein a total content of the compound A and the compound B is from 3 to 30 parts by mass with respect to 100 parts by mass of the binder resin, and a mass ratio of the content of the compound A to the content of the compound B (compound A/compound B) is from 0.8 to 20.

公开(公告)号：US10353306B2

公开(公告)日：2019-07-16

申请号：US15561722

申请日：2016-03-10

Applicant: ZEON CORPORATION

Inventor： Masashi Watanabe

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/09 ,  G03G9/097

Abstract: To provide an efficient method for producing a negatively chargeable toner in which a carbon black (as a colorant) is well dispersed and which has high chargeability, has excellent transfer efficiency, prevent a white spot and provides an image with sufficient image density. Disclosed is a method for producing a negatively chargeable toner, the method including: a suspension step of obtaining a suspension in which droplets of a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black, a softening agent and a charge control agent, which is a specific, sulfonic acid group-containing copolymer, are dispersed, by suspending the polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer, and a step of obtaining colored resin particles by suspension polymerization using the suspension in the presence of a polymerization initiator.