The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2026
Filed:
May. 12, 2023
Fujifilm Business Innovation Corp., Tokyo, JP;
Erina Saito, Kanagawa, JP;
Tomohito Nakajima, Kanagawa, JP;
Daisuke Ishizuka, Kanagawa, JP;
Tsutomu Furuta, Kanagawa, JP;
FUJIFILM Business Innovation Corp., Tokyo, JP;
Abstract
An electrostatic charge image developing toner contains toner particles that contain a binder resin containing an amorphous resin and a crystalline resin and resin particles, in which the electrostatic charge image developing toner satisfies the following Condition (1) and Condition (2). Condition (1): in a case where dynamic viscoelasticity of the toner particles is measured, a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×10Pa·s is 50° C. or lower, Condition (2): in a case where dynamic viscoelasticity of the resin particles is measured, a complex viscosity η* of the resin particles at the temperature T0 is 1.0×10Pa·s or more, and ΔA calculated by the following Equation (1) is 0.2 or more. Equation (1): ΔA=|Log η*(T0+5)−Log η*(T0−5)|, in Equation (1), η*(T0+5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. higher than the temperature T0, and η*(T0−5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. lower than the temperature T0.