US 12,189,334 B2
Electrostatic charge image developing toner and electrostatic charge image developer
Satoshi Miura, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); Atsushi Sugawara, Kanagawa (JP); Shintaro Anno, Kanagawa (JP); and Daisuke Noguchi, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Oct. 13, 2021, as Appl. No. 17/500,891.
Claims priority of application No. 2021-087871 (JP), filed on May 25, 2021.
Prior Publication US 2022/0382177 A1, Dec. 1, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/0821 (2013.01) [G03G 9/0825 (2013.01); G03G 9/08711 (2013.01); G03G 9/08755 (2013.01); G03G 9/0924 (2013.01); G03G 9/09733 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electrostatic charge image developing toner comprising:
a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a colorant, wherein the colorant comprises a pigment having an isoindoline skeleton,
wherein a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less, wherein a proportion of the pigment having an isoindoline skeleton in the colorant in the toner is 50% by mass or more and 100% by mass or less,
wherein the toner particle contains an amorphous resin and a crystalline resin as the binder resin, and
in a case where a cross section of the toner particle is observed, at least two domains of crystalline resins satisfy Condition (A), Condition (B1), Condition (C), and Condition (D),
Condition (A): an aspect ratio of the domain of the crystalline resin is 5 or more and 40 or less;
Condition (B1): a major axis length of the domain of the crystalline resin is 0.5 μm or more and 1.5 μm or less;
Condition (C): an angle between an extension line of the major axis of the domain of the crystalline resin and a tangent line at a contact point where the extension line is in contact with a surface of the toner particle is 60 degrees or more and 90 degrees or less; and
Condition (D): a crossing angle between extension lines of the major axes in two domains of the crystalline resins is 45 degrees or more and 90 degrees or less.