公开(公告)号：US20220326632A1

公开(公告)日：2022-10-13

申请号：US17657471

申请日：2022-03-31

申请人： Keiji MAKABE ,  Akira Tanaka ,  Hidekazu Kakinuma ,  Tsukiko Takahashi

发明人： Keiji MAKABE ,  Akira Tanaka ,  Hidekazu Kakinuma ,  Tsukiko Takahashi

IPC分类号： G03G9/097 ,  G03G15/08 ,  G03G9/08

摘要： [Object] An object of the invention is to provide a toner that can both achieve a higher level of low temperature fixability and suppression of the toner scattering.
[Means of Achieving the Object]
The disclosure is to provide a toner, including base-particles, and an external-additive, wherein a glass-transition temperature obtained from a DSC-curve at a second-warming of a THF-insoluble component is −50° C. or higher and 10° C. or lower, wherein an average circularity of the toner is 0.975 or more and 0.985 or lower, wherein the toner satisfies the following formula: 1.5≤Bt−0.025−Ct≤3.0, wherein the Bt [m2/g] is a BET-specific-surface area of the toner-particles, and the Ct [%] is a coverage by the external-additive, and, at least a portion of a surface of the external-additive is coated with either an oxide of a metallic element, a hydroxide of the metallic element, or both.

公开(公告)号：US20230305413A1

公开(公告)日：2023-09-28

申请号：US18088788

申请日：2022-12-27

申请人： Hidekazu KAKINUMA ,  Hiroshi YAMADA

发明人： Hidekazu KAKINUMA ,  Hiroshi YAMADA

IPC分类号： G03G9/087 ,  G03G9/08 ,  G03G15/08

CPC分类号： G03G9/08755 ,  G03G9/0806 ,  G03G9/0821 ,  G03G9/08782 ,  G03G15/0822

摘要： A toner includes: a crystalline polyester, an amorphous polyester, and a release agent. In measurement through DSC of the toner before a predetermined storage treatment, one or more peaks as an endothermic component are present in a temperature region lower than a peak derived from the crystalline polyester. The toner satisfies expression (1) below.




1.5
≤
H
1
−
H
2
≤
4.5



J
/
g







In the expression (1), H1 is a total endothermic amount of an endothermic amount of the peak derived from the crystalline polyester and the one or more peaks present in the lower temperature region in the measurement through DSC of the toner before the storage treatment. H2 is an endothermic amount of a peak derived from the crystalline polyester in measurement through DSC of the toner after the storage treatment.