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:
Apr. 24, 2018
Filed:
May. 30, 2013
Toda Kogyo Corp., Hiroshima-shi, Hiroshima-ken, JP;
Kaori Kinoshita, Otake, JP;
Eiichi Kurita, Otake, JP;
TODA KOGYO CORP., Hiroshima, JP;
Abstract
The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical composite core particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin, and having an average particle diameter of 20 to 60 μm, the magnetic carrier for an electrophotographic developer satisfying the formula (1): σ−σ=−2 to 0 wherein σrepresents a saturation magnetization (Am/kg) of the carrier particles having a particle diameter in the vicinity of the average particle diameter of the magnetic carrier for an electrophotographic developer; and σrepresents a saturation magnetization (Am/kg) of the carrier particles having a particle diameter of less than 20 μm, and a two-component system developer using the magnetic carrier. The two-component system developer of the present invention includes a magnetic carrier used for an electrophotographic developer which can exhibit a good durability, is free from occurrence of carrier adhesion, and can maintain a high quality of images produced for a long period of time, and comprises the magnetic carrier for an electrophotographic developer and a toner.