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:
Feb. 14, 2012
Filed:
Nov. 19, 2007
Nobumichi Kamiyoshi, Wakayama, JP;
Manabu Suzuki, Wakayama, JP;
Yutaka Murai, Wakayama, JP;
KAO Corporation, Tokyo, JP;
Abstract
The present invention relates to a process for producing a toner for electrophotography which includes the steps of (A) forming resin-containing core particles having a volume median particle size (D50) of from 1 to 10 μm in an aqueous medium; (B) adding composite fine particles containing a polyester-containing resin and a charge control agent, or composite fine particles containing 'fine particles of the charge control agent' and 'fine particles of the polyester-containing resin', to the core particles obtained in the step (A) to allow the composite fine particles to adhere onto the core particles, thereby obtaining “composite fine particle-adhering core particles”; and (C) heating the “composite fine particle-adhering core particles” obtained in the step (B), to obtain coalesced particles. There are provided a process for producing a toner for electrophotography having a small particle size and a narrow particle size distribution which is capable of allowing a charge control agent to exist on a surface of the toner; and a toner for electrophotography which is produced by the process and can exhibit excellent image-forming characteristics.