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:
Mar. 13, 2012
Filed:
Mar. 18, 2009
Masahiro Anno, Tokyo, JP;
Masahiko Nakamura, Tokyo, JP;
Tsuyoshi Uchida, Tokyo, JP;
Kenichi Onaka, Tokyo, JP;
Junya Onishi, Tokyo, JP;
Naoya Tonegawa, Tokyo, JP;
Masahiro Anno, Tokyo, JP;
Masahiko Nakamura, Tokyo, JP;
Tsuyoshi Uchida, Tokyo, JP;
Kenichi Onaka, Tokyo, JP;
Junya Onishi, Tokyo, JP;
Naoya Tonegawa, Tokyo, JP;
Konica Minolta Business Technologies, Inc., Tokyo, JP;
Abstract
It is to provide a toner which can form an image of high image quality exhibiting high resolution wherein a final visible image exhibits high image density and high thin-line reproducibility even in long-term use. In a toner incorporating at least a colored particle containing a binder resin composed of a polyester resin and a colorant, and external additive particles, the toner has a degree of average circularity of 0.950-0.990, a volume based median diameter of 4.5-8.0 μm, a volume based particle diameter dispersibility (CVvalue) of 15-25; a metal selected from titanium, germanium, and aluminum is incorporated at a ratio of 10-1500 ppm; the above external additive particles is composed of a composite oxide incorporating a silicon atom and at least either of a titanium atom and an aluminum atom; and the existence ratio of silicon atoms in the surface thereof is higher than the existence ratio of silicon atoms in the entire part thereof.