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:
Oct. 28, 2014
Filed:
Jun. 18, 2012
Saburou Hiraoka, Tokyo, JP;
Tomomi Oshiba, Tokyo, JP;
Mikihiko Sukeno, Tokyo, JP;
Tomoko Mine, Tokyo, JP;
Hitomi Motani, Tokyo, JP;
Tatsuya Nagase, Tokyo, JP;
Ken Ohmura, Tokyo, JP;
Saburou Hiraoka, Tokyo, JP;
Tomomi Oshiba, Tokyo, JP;
Mikihiko Sukeno, Tokyo, JP;
Tomoko Mine, Tokyo, JP;
Hitomi Motani, Tokyo, JP;
Tatsuya Nagase, Tokyo, JP;
Ken Ohmura, Tokyo, JP;
Konica Minolta Business Technologies, Inc., Tokyo, JP;
Abstract
The toner for electrostatic image development has excellent charge properties, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved. The toner is composed of toner particles containing a binder resin. The process has an aggregating step of adding an aggregating agent containing a transition element into an aqueous medium of dispersed fine binder resin particles to aggregate the fine binder resin particles, and an aggregation-stopping step of adding an aggregation stopper composed on a sulfur atom-containing compound exhibiting a reducing action on the aggregating agent. The aggregating agent is a salt of a bivalent or higher metal selected from Sr, Ti, V, Cr, Mn, Fe, Co, Ni and Cu.