US 11,809,130 B2
Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
Shintaro Anno, Kanagawa (JP); Atsushi Sugawara, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); Daisuke Noguchi, Kanagawa (JP); and Satoshi Miura, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jan. 12, 2021, as Appl. No. 17/146,922.
Claims priority of application No. 2020-159123 (JP), filed on Sep. 23, 2020.
Prior Publication US 2022/0091526 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/083 (2006.01); G03G 15/08 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/08755 (2013.01) [G03G 9/0806 (2013.01); G03G 9/0817 (2013.01); G03G 9/0819 (2013.01); G03G 9/0832 (2013.01); G03G 9/08782 (2013.01); G03G 9/09708 (2013.01); G03G 15/0865 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A toner for developing an electrostatic charge image, the toner comprising:
toner particles containing at least one binder resin;
a Mg element in an amount such that in an x-ray fluorescence analysis of the toner, a net intensity of a peak for the Mg element is 0.10 kcps or more and 1.20 kcps or less; and
at least one external additive including particles of at least one compound represented by formula (1) below,
MTiO3  (1)
where M represents at least one selected from the group consisting of Ca, Sr, and Ba,
wherein the binder resin includes an amorphous resin and at least one crystalline resin,
wherein in a cross-sectional observation of the toner particles, there are toner particles in which at least two domains of the crystalline resin meet condition (B1) or (B2) below:
condition (B1) that each domain of the crystalline resin measures 0.5 μm or more and 1.5 μm or less along a major axis thereof;
condition (B2) that at least one of the two domains of the crystalline resin measures that along a major axis thereof that 10% or more and 30% or less of a longest diameter of the toner particle,
and in a cross-sectional observation of the toner particles, there are toner particles in which at least two domains of the crystalline resin meet conditions (A), (C), and (D) below:
condition (A) that each domain of the crystalline resin has an aspect ratio of 5 or more and 40 or less;
condition (C) that a line extended from the major axis of each domain of the crystalline resin makes an angle of 60° or more and 90° or less with a tangent to a surface of the toner particle at a point of contact between the extended line and the surface; and
condition (D) that lines extended from the major axis of the two domains of the crystalline resin cross each other at an angle of 45° or more and 90° or less.