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. 24, 2005
Filed:
Nov. 06, 2001
Charge controlling agent, method for producing the same and toner for developing electrostatic image
Shinji Otani, Ibaraki, JP;
Noriyuki Suzuki, Ibaraki, JP;
Hideyuki Otsuka, Ibaraki, JP;
Mitsutoshi Anzai, Kanagawa, JP;
Shinji Otani, Ibaraki, JP;
Noriyuki Suzuki, Ibaraki, JP;
Hideyuki Otsuka, Ibaraki, JP;
Mitsutoshi Anzai, Kanagawa, JP;
Hodogaya Chemical Co., Ltd., Kawasaki, JP;
Abstract
A method for producing a charge controlling agent comprisinig a reaction product of an aromatic hydroxycarboxylic acid and a calcium compound bonded by at least one bondinig system selected from the group consisting of coordinate bonding, covalent bonding and ionic bonding, characterized in that the aromatic hydroxycarboxylic acid and the calcium compound are reacted by dropwise adding a solution of the aromatic hydroxycarboxylic acid to a solution of the calcium compound as a metal-imparting agent, a charge controlling agent produced by said method, which has a shape coefficient (SF-1) average value of at most 250 and a shape coefficient (SF-2) average value of at most 200, and an electrostatic image developing toner containing said charge controlling agent having a presence ratio on a toner surface of at least 2.0 mg/1 g of toner.