US 11,733,618 B2
Electrostatic image developing toner, electrostatic image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
Satoshi Miura, Kanagawa (JP); Shintaro Anno, Kanagawa (JP); Daisuke Noguchi, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); and Atsushi Sugawara, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Dec. 31, 2020, as Appl. No. 17/139,050.
Claims priority of application No. 2020-159122 (JP), filed on Sep. 23, 2020.
Prior Publication US 2022/0091524 A1, Mar. 24, 2022
Int. Cl. G03G 9/087 (2006.01); G03G 15/08 (2006.01); G03G 21/18 (2006.01); C08G 63/547 (2006.01); C08G 63/16 (2006.01); C08F 212/08 (2006.01); G03G 9/09 (2006.01); G03G 9/08 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/08755 (2013.01) [C08F 212/08 (2013.01); C08G 63/16 (2013.01); C08G 63/547 (2013.01); G03G 9/0821 (2013.01); G03G 9/08711 (2013.01); G03G 9/091 (2013.01); G03G 9/09733 (2013.01); G03G 15/0865 (2013.01); G03G 21/1814 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrostatic image developing toner comprising:
an amorphous polyester resin;
a crystalline polyester resin; and
C.I. Pigment Red 57:1,
wherein a Net intensity NMg of an Mg element, the Net intensity NMg being determined by X-ray fluorescence analysis, is 0.10 kcps or more and 0.40 kcps or less, and
wherein a Net intensity NCa of a Ca element, the Net intensity NMg of the Mg element, and a Net intensity NCl of a Cl element, the Net intensities NCa, NMg, and NCl being determined by X-ray fluorescence analysis, satisfy 0.50≤(NMg+NCl)/NCa≤1.50,
wherein the electrostatic image developing toner comprising a toner particle including at least two crystalline resin domains satisfying conditions (A), (B1), (C), and (D) below when a cross section of the toner particle is observed,
Condition (A) that each of the crystalline resin domains has an aspect ratio of 5 or more and 40 or less,
Condition (B1) that each of the crystalline resin domains has a major axis length of 0.5 μm or more and 1.5 μm or less,
Condition (C) that an angle formed by an extension of a major axis of each of the crystalline resin domains and a tangent to a surface of the toner particle at a point at which the extension intersects the surface of the toner particle is 60° or more and 90° or less,
Condition (D) that an angle at which extensions of major axes of two of the crystalline resin domains intersect each other is 45° or more and 90° or less.