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:
Mar. 06, 2023
Fujifilm Business Innovation Corp., Tokyo, JP;
Kotaro Yoshihara, Kanagawa, JP;
FUJIFILM Business Innovation Corp., Tokyo, JP;
Abstract
A method for producing an electrostatic charge image development toner includes: a first step of aggregating polyester resin particles and a flat color material to produce a first aggregated particle dispersion in which first aggregated particles having a number-average particle diameter of 1 μm or more are dispersed; a second step of adding a non-crystalline resin particle dispersion in which non-crystalline resin particles are dispersed to the first aggregated particle dispersion to cause the non-crystalline resin particles to be attached to the first aggregated particles and obtain second aggregated particles; and a third step of heating a second aggregated particle dispersion in which the second aggregated particles are dispersed to cause the second aggregated particles to coalesce, wherein the non-crystalline resin particle dispersion satisfies Formulas (1) to (3), Formula (1): −0.01×A−0.25×B+9.2≤pH≤−0.01×A−0.25×B+10.0, Formula (2): 100 nm≤A≤250 nm, Formula (3): 5 mgKOH/g≤B≤20 mgKOH/g, in which A is a particle diameter of the non-crystalline resin particles, B is an acid value of the non-crystalline resin, and pH is a pH of the non-crystalline resin particle dispersion.