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:
Aug. 27, 2019
Filed:
Oct. 08, 2018
Kyocera Document Solutions Inc., Osaka, JP;
Ryotaro Komada, Osaka, JP;
KYOCERA Document Solutions Inc., Osaka, JP;
Abstract
A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive. The toner mother particle includes a toner core containing a binder resin and a shell layer covering a surface of the toner core. The external additive includes a plurality of silica particles. The silica particles are each present on a surface of the shell layer and include a silica base having a surface treated with a surface treatment agent. The surface treatment agent includes a first treatment agent having a carboxyl group in a molecule thereof. The toner core and each of the silica particles is bonded to each other through a specific covalent bond. An amount of ring-unopened oxazoline groups included in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 0.10 μmol and no greater than 100 μmol.