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:
Dec. 05, 2006
Filed:
Mar. 05, 2004
Yoshinobu Baba, Kanagawa, JP;
Yuko Sato, Shizuoka, JP;
Ryoichi Fujita, Tokyo, JP;
Takaaki Kotaki, Shizuoka, JP;
Nobuyoshi Sugahara, Shizuoka, JP;
Kazuo Terauchi, Shizuoka, JP;
Takayuki Itakura, Shizuoka, JP;
Yoshinobu Baba, Kanagawa, JP;
Yuko Sato, Shizuoka, JP;
Ryoichi Fujita, Tokyo, JP;
Takaaki Kotaki, Shizuoka, JP;
Nobuyoshi Sugahara, Shizuoka, JP;
Kazuo Terauchi, Shizuoka, JP;
Takayuki Itakura, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0–6.5 μm; has an average circularity of particles in the toner each having a circle-equivalent diameter of 2 μm or more of 0.920–0.945; has a BET specific surface area of 2.1–3.5 m/g; and has a permeability of light of a wavelength of 600 nm in a liquid having dispersed the toner in a 45 vol % methanol aq. of 30–80%. The present invention also provides a two-component developer: comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer; and has a number average particle diameter of 15–80 μm. Using the toner and the two-component developer enables a high-quality image to be formed at a high speed even in an oilless fixing system.