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. 14, 2010
Filed:
Mar. 02, 2009
Takaaki Kaya, Suntou-gun, JP;
Shigeto Tamura, Suntou-gun, JP;
Ryoichi Fujita, Chofu, JP;
Makoto Kambayashi, Suntou-gun, JP;
Takeshi Ikeda, Suntou-gun, JP;
Takaaki Kaya, Suntou-gun, JP;
Shigeto Tamura, Suntou-gun, JP;
Ryoichi Fujita, Chofu, JP;
Makoto Kambayashi, Suntou-gun, JP;
Takeshi Ikeda, Suntou-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is magnetic toner including capsule type toner particles each having a surface layer (B) on a surface of a toner base particle (A) containing at least a binder resin (a) mainly formed of a polyester, a magnetic substance, and a wax, in which, the surface layer (B) includes a resin (b), and the resin (b) includes a resin selected from the group consisting of a polyester resin (b1), a vinyl resin (b2), and a urethane resin (b3); a glass transition temperature Tg(a) of the binder resin (a) and a glass transition temperature Tg(b) of the resin (b) satisfy a relationship of Tg(a)<Tg(b); a magnetization (σt) in an external magnetic field of 79.6 kA/m of the magnetic toner is 12 Am/kg or more and 30 Am/kg or less; and an average circularity of the toner is 0.960 or more and 1.000 or less.