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:
Nov. 03, 2015
Filed:
Sep. 12, 2012
Keisuke Tada, Shizuoka, JP;
Kenichi Uehara, Shizuoka, JP;
Daisuke Misawa, Shizuoka, JP;
Ayumi Oikawa, Kanagawa, JP;
Hiroshi Endoh, Shizuoka, JP;
Keisuke Tada, Shizuoka, JP;
Kenichi Uehara, Shizuoka, JP;
Daisuke Misawa, Shizuoka, JP;
Ayumi Oikawa, Kanagawa, JP;
Hiroshi Endoh, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method for manufacturing a toner, including at least: dissolving or dispersing a toner material including at least any one of a binder resin and a precursor of a binder resin in an organic solvent which is dispersed in a dispersant-including aqueous medium; forming particles by removing the organic solvent; washing the particles; forming voids in the particles by heating to a temperature T while or after dispersing the particles in an aqueous medium; forming toner base particles by adding a charge controlling agent; and adding an external additive to the toner base particles to obtain toner particles, wherein the T is between a glass transition temperature Tg of the toner particles and Tg+25° C., and the toner has a cross-sectional void fraction Sp/St of 0.1% to 15.0%, where St is a cross-sectional area of the toner particles, and Sp is a cross-sectional area of the voids.