公开(公告)号：US20190072867A1

公开(公告)日：2019-03-07

申请号：US16114495

申请日：2018-08-28

Applicant: KAO CORPORATION

Inventor： Norihiro FUKURI ,  Takashi Kubo

IPC: G03G9/087

CPC classification number: G03G9/08755 ,  C08G63/547 ,  C08G63/672 ,  G03G9/08795 ,  G03G9/08797

Abstract: An embodiment of the present invention relates to a method for producing a binder resin, from which a toner having excellent low-temperature fusing property, roller release properties, and pulverization properties, is obtained, a binder resin, and a toner for development of electrostatic images including the binder resin.An embodiment of the present invention relates to a method for producing a binder resin including the following steps (1) and (2): step (1): mixing an aromatic alcohol including an alkylene oxide adduct of bisphenol A and fumaric acid; and step (2): further adding a carboxylic acid to the mixture obtained in the step (1) and mixing until a softening point of the binder resin in the system falls within the predetermined range, wherein in the molecular weight distribution measured by gel permeation chromatography, the binder resin includes 40% or more of components having a molecular weight of 10,000 or more and has a peak top of molecular weight distribution within a range of 7,500 or more and 10,000 or less.

公开(公告)号：US20130029263A1

公开(公告)日：2013-01-31

申请号：US13644025

申请日：2012-10-03

Applicant: KAO CORPORATION

Inventor： Satoshi KUNII ,  Masahito Yamazaki ,  Takashi Kubo

IPC: G03G9/087 ,  B82Y30/00

CPC classification number: G03G9/0821 ,  G03G9/08755 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/09716 ,  G03G9/09725

Abstract: A toner for non-contacting fusing containing toner matrix particles containing a resin binder and an external additive having an average particle size of from 10 to 100 nm, wherein the external additive is externally added to the toner matrix particles, wherein the resin binder contains one or more polyesters, wherein a carboxylic acid component of the polyester contains one or more isophthalic acid compounds and one or more fumaric acid/maleic acid compounds, wherein the isophthalic acid compound is contained in an amount of from 10 to 35% by weight, the fumaric acid/maleic acid compound is contained in an amount of from 1 to 15% by weight, and the isophthalic acid compound and the fumaric acid/maleic acid compound are contained in a total amount of from 20 to 36% by weight, of a total amount of the entire raw material monomers of the polyester in the resin binder, and wherein the toner has a softening point of from 90° to 120° C. The toner is suitably used in developing latent images formed in, for example, electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.