Invention Grant
- Patent Title: Process for producing toner for electrophotography
- Patent Title (中): 电子照相用调色剂的制造方法
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Application No.: US11683031Application Date: 2007-03-07
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Publication No.: US07846636B2Publication Date: 2010-12-07
- Inventor: Kazuhiro Ishikawa
- Applicant: Kazuhiro Ishikawa
- Applicant Address: JP Tokyo
- Assignee: Kao Corporation
- Current Assignee: Kao Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-065776 20060310
- Main IPC: G03G5/00
- IPC: G03G5/00

Abstract:
The present invention relates to a process for readily producing a toner for electrophotography which contains toner particles having a small particle size and a narrow particle size distribution, and a toner for electrophotography having a small particle size and a narrow particle size distribution which is produced by the above process. There is provided a process for producing a toner for electrophotography which includes the steps of (A) finely dispersing a resin binder in an aqueous medium in the presence of a nonionic surfactant to prepare a dispersion of resin binder-containing fine particles; (B) aggregating the resin binder-containing fine particles obtained in the step (A) together to prepare a dispersion of mother particles; (C) adding a dispersion of a resin binder-containing fine particles at one time or sequentially in several divided parts to the dispersion of the mother particles obtained in the step (B) to prepare aggregated particles thereof; and (D) coalescing the aggregated particles obtained in the step (C), as well as a toner for electrophotography which is produced by the above process.
Public/Granted literature
- US20070212628A1 PROCESS FOR PRODUCING TONER FOR ELECTROPHOTOGRAPHY Public/Granted day:2007-09-13
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