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. 05, 1998
Filed:
Apr. 30, 1996
Tsuyoshi Takiguchi, Kawasaki, JP;
Kenji Okado, Yokohama, JP;
Masaaki Taya, Kawasaki, JP;
Ryoichi Fujita, Kawasaki, JP;
Makoto Kanbayashi, Kawasaki, JP;
Kohji Inaba, Yokohama, JP;
Wakashi Iida, Higashikurume, JP;
Kazunori Kato, Mitaka, JP;
Tetsuya Ida, Kawasaki, JP;
Shinya Yachi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner for developing electrostatic images is formed of toner particles comprising (a) a binder resin, (b) a colorant or magnetic material, (c) an aromatic hydroxycarboxylic acid (A), and (d) a metal compound of the aromatic hydroxycarboxylic acid (A). The aromatic hydroxycarboxylic acid (A) and the metal compound of the aromatic hydroxycarboxylic acid (A) are contained in a weight ratio of 1:99 to 10:90. As a result of co-inclusion of a small amount of the aromatic hydroxycarboxylic acid (A) in addition to the metal compound thereof, the resultant toner is provided with a quick chargeability in a low humidity environment and an improved level of triboelectric charge in a high humidity environment, presumably because of the stabilization effect of the small amount of the aromatic hydroxycarboxylic acid (A) on the metal compound thereof.