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. 08, 2020
Filed:
Feb. 11, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Shuntaro Watanabe, Hadano, JP;
Tatsuya Saeki, Suntou-gun, JP;
Atsuhiko Ohmori, Yokohama, JP;
Shuhei Moribe, Mishima, JP;
Hiroki Akiyama, Suntou-gun, JP;
Kazumichi Nakahama, Suntou-gun, JP;
Katsuhisa Yamazaki, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is an external additive having a resin particle containing a crystalline resin, and an inorganic fine particle containing a metal atom, the inorganic fine particle being embedded in the resin particle, wherein part of the inorganic fine particle being exposed on a surface of the resin particle, the maximum endothermic peak temperature of the external additive during a first temperature rise is from 50.0° C. to 120° C., the shape factor SF-2 of the external additive is from 110 to 150, and the external additive satisfies following formulae (1) and (2) below, in which Za (mass %) is the percentage content of a metal atom contained in the inorganic fine particle on the surface of the external additive in X-ray photoelectron spectroscopy, and Zb (mass %) is the percentage content of the metal atom in thermogravimetric analysis of the external additive,≥15  (1), and≥0.7  (2)