公开(公告)号：US10331053B2

公开(公告)日：2019-06-25

申请号：US15542583

申请日：2016-01-14

Applicant: KAO CORPORATION

Inventor： Shoichi Murata ,  Hiroto Hayashi

IPC: G03G9/087 ,  G03G9/08 ,  C08G63/20

Abstract: The present invention relates to a process for producing a toner for development of electrostatic images, including step (1): subjecting a polyhydric alcohol component and a polycarboxylic acid component to polycondensation reaction in the presence of a hydroxy group- or carboxy group-containing hydrocarbon wax (W1) to obtain a non-crystalline resin (A) containing a constitutional component derived from the hydrocarbon wax (W1) and also containing a polyester moiety; step (2): dispersing the non-crystalline resin (A) obtained in the step (1) in an aqueous medium to obtain an aqueous dispersion of resin particles (X); step (3): aggregating the resin particles (X) obtained in the step (2) in an aqueous medium in the presence of a crystalline polyester (B) to obtain aggregated particles; and step (4): coalescing the aggregated particles obtained in the step (3).

公开(公告)号：US10078278B2

公开(公告)日：2018-09-18

申请号：US15315117

申请日：2015-06-10

Applicant: KAO CORPORATION

Inventor： Shoichi Murata ,  Tomohide Yoshida ,  Hiroto Hayashi ,  Motomu Shibata

IPC: G03G9/08 ,  G03G9/093 ,  G03G9/087 ,  G03G9/09

CPC classification number: G03G9/0806 ,  G03G9/0804 ,  G03G9/08708 ,  G03G9/08711 ,  G03G9/08755 ,  G03G9/08782 ,  G03G9/08786 ,  G03G9/08788 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/0918 ,  G03G9/09328 ,  G03G9/09364 ,  G03G9/09371 ,  G03G9/09378 ,  G03G9/09392

Abstract: The present invention relates to a process for producing a toner for development of electrostatic images, including the following steps (1) to (3): Step (1): aggregating resin particles (X) containing a composite resin that contains a segment constituted of a polyester resin (a) obtained by polycondensing an alcohol component containing 80 mol % or more of a propyleneoxide adduct of bisphenol A and a polycarboxylic acid component, and a vinyl-based resin segment containing a constitutional unit derived from a styrene-based compound, in an aqueous medium, to obtain aggregated particles (1); Step (2): aggregating the aggregated particles (1) obtained in the step (1) with resin particles (Y) containing a polyester resin (b) obtained by polycondensing an alcohol component containing 80 mol % or more of an ethyleneoxide adduct of bisphenol A and a polycarboxylic acid component to obtain aggregated particles (2); and Step (3): coalescing the aggregated particles (2) obtained in the step (2).