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:
Jun. 30, 2015
Filed:
Sep. 24, 2013
Konica Minolta, Inc., Chiyoda-ku, JP;
Kenji Hayashi, Hachiouji, JP;
Masahiro Anno, Sakai, JP;
Yukiko Uno, Kyoto, JP;
Satoshi Matsumoto, Kyoto, JP;
KONICA MINOLTA, INC., Chiyoda-Ku, Tokyo, JP;
Abstract
A liquid developer is obtained by dispersing toner particles containing at least a resin and a coloring agent in an insulating liquid. The toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. The coloring agent contains nigrosine. A content of nigrosine in the toner particles is not lower than 1 mass % and not higher than 20 mass %. The second resin satisfies Equations (1) to (2) below. In Equations (1) to (2), x represents a number average molecular weight of the second resin and y represents a urethane group concentration (mass %) in the second resin.−0.00003+2.03≦≦−0.00003+6.95  Equation (1)10000≦≦60000  Equation (2)