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:
Dec. 05, 2017
Filed:
Sep. 24, 2014
Hodogaya Chemical Co., Ltd., Tokyo, JP;
Masaki Okubo, Ibaraki, JP;
Ikuo Kimura, Ibaraki, JP;
Masami Ito, Tokyo, JP;
Motonori Tsuji, Tokyo, JP;
Takeshi Yamamoto, Tokyo, JP;
Masaya Tojo, Ibaraki, JP;
Masafumi Asakai, Tokyo, JP;
Tetsuya Yoshida, Tokyo, JP;
HODOGAYA CHEMICAL CO., LTD., Tokyo, JP;
Abstract
To provide a charge control agent and a toner having a superior charging characteristic. A charge control agent containing a bis-phthalimide derivative represented by formula. Thus, it is possible to provide a safe, negative chargeability charge control agent with which the rate of rise of the charge can be increased, and which has a high charging amount and poses no problem in terms of waste regulations. Furthermore, it is possible to provide a negatively chargeable toner (and particularly, a negatively chargeable polymerized toner) for electrostatic image development which uses this charging control agent and has a superior charging characteristic.