US 11,698,593 B2
Toner for electrostatic image development, electrostatic image developer, and toner cartridge
Yoshimasa Fujihara, Kanagawa (JP); Atsushi Sugawara, Kanagawa (JP); Shintaro Anno, 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. 25, 2021, as Appl. No. 17/157,238.
Claims priority of application No. 2020-159127 (JP), filed on Sep. 23, 2020.
Prior Publication US 2022/0091528 A1, Mar. 24, 2022
Int. Cl. G03G 9/087 (2006.01); G03G 9/08 (2006.01)
CPC G03G 9/08755 (2013.01) [G03G 9/0802 (2013.01); G03G 9/0819 (2013.01); G03G 9/08782 (2013.01); G03G 9/08797 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A toner for electrostatic image development comprising toner particles containing a binder resin,
wherein the binder resin includes an amorphous resin and a crystalline resin, and
wherein, in the toner particles, a Net intensity of elemental Mg measured by X-ray fluorescence analysis is from 0.40 to 1.20 inclusive, and a Net intensity of elemental Cl measured by X-ray fluorescence analysis is from 0.02 to 0.60 inclusive;
wherein in a cross-sectional observation of the toner particles, there are toner particles in which at least two domains of the crystalline resin satisfy at least one of condition (B1) and condition (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 satisfy the 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.