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:
Jan. 12, 2016
Filed:
May. 18, 2012
Hiromichi Jin, Tokyo, JP;
Takeru Chiba, Tokyo, JP;
Hidehiko Iinuma, Gunma, JP;
Kenichi Yamazaki, Gunma, JP;
Hiromichi Jin, Tokyo, JP;
Takeru Chiba, Tokyo, JP;
Hidehiko Iinuma, Gunma, JP;
Kenichi Yamazaki, Gunma, JP;
ZEON CORPORATION, Tokyo, JP;
KANTO DENKA KOGYO CO., LTD., Tokyo, JP;
Abstract
An electrostatic image developer having little change in charge amount, no generation of fog and excellent environmental stability under all of low temperature and low humidity environment, normal temperature and normal humidity environment, and high temperature and high humidity environment is provided. Disclosed is an electrostatic image developer comprising a colored resin particle containing a binder resin and a colorant, and an external additive, wherein the external additive contains an alumina fine particle in plate-like shape subjected to a hydrophobicity-imparting treatment having a number average primary particle diameter of 20 to 120 nm and an aspect ratio of 3 to 15, and a content of the alumina fine particle is in the range from 0.05 to 1 part by mass with respect to 100 parts by mass of the colored resin particle.