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:
May. 31, 2016
Filed:
Jun. 19, 2014
Kabushiki Kaisha Toshiba, Minato, Tokyo, JP;
Toshiba Tec Kabushiki Kaisha, Shinagawa, Tokyo, JP;
Maiko Yoshida, Shizuoka, JP;
Satoshi Araki, Shizuoka, JP;
Taishi Takano, Shizuoka, JP;
Takashi Urabe, Shizuoka, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
TOSHIBA TEC KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A method of producing an electrophotographic toner includes aggregation and fusion steps. The aggregation step includes obtaining aggregates by mixing a first dispersion that contains pigment particles with a second dispersion that contains fine resin particles, and aggregating the pigment particles and the fine resin particles. The fusion step includes fusing the pigment particles and the fine resin particles by heating the aggregates. When the first dispersion is mixed with the second dispersion, the sign of the mean of zeta potential of the pigment particles in the first dispersion is set to be opposite to the sign of the mean of zeta potential of the fine resin particles in the second dispersion. In the first dispersion, the proportion of the pigment particles out of the total, having a sign opposite to the sign of the mean of zeta potential of the pigment particles is 10% or less.