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:
Sep. 29, 2026
Filed:
Jan. 22, 2024
Canon Kabushiki Kaisha, Tokyo, JP;
Hiroki Kagawa, Shizuoka, JP;
Tomohisa Sano, Shizuoka, JP;
Kosuke Fukudome, Tokyo, JP;
Tohru Hiramatsu, Shizuoka, JP;
Atsuhiko Ohmori, Kanagawa, JP;
Kazuyuki Sato, Kanagawa, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The present invention provides a toner which can form a stable image even in a low print intermittent mode under a low-temperature and low-humidity environment, while having excellent charge rising property. A toner includes a toner particle and a silica fine particle A, wherein (I) in TOF-SIMS measurement of the toner particle, a fragment peak derived from a boron atom and a fragment peak derived from a BO structure are detected, and the toner contains dodecylbenzenesulfonic acid or a dodecylbenzenesulfonate; (II) in TOF-SIMS measurement of the silica fine particle A, a fragment ion is observed which corresponds to a dimethylsiloxane structure; when 2.00 g of the silica fine particle is dispersed in a mixed liquid of 25.0 g of ethanol and 75.0 g of an aqueous solution of 20% by mass of NaCl, and the dispersion is subjected to a titration operation which uses sodium hydroxide, Sn defined by Sn=[(a−b)×c×NA]/(d×e) satisfies 0.10≤Sn≤0.80.