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, 2006
Filed:
Dec. 30, 2005
Hideki Takayama, Fujisawa, JP;
Kumiko Mafune, Kawasaki, JP;
Daiji Okamura, Yokohama, JP;
Shin-ichi Sato, Kawasaki, JP;
Jun Yoshizawa, Tokyo, JP;
Kunihiko Nakamura, Gotenba, JP;
Hideki Takayama, Fujisawa, JP;
Kumiko Mafune, Kawasaki, JP;
Daiji Okamura, Yokohama, JP;
Shin-ichi Sato, Kawasaki, JP;
Jun Yoshizawa, Tokyo, JP;
Kunihiko Nakamura, Gotenba, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention aims to provide an ink jet black ink which can improve weatherability, optical density and sticking recovery property of nozzles of a recording head. According to the present invention, an ink jet black ink is provided which comprises at least a coloring-material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof, and the water-soluble organic solvent is a water-soluble organic solvent having a relative permittivity of from 30.0 or more to less than 70.0 at 20° C. and capable of dissolving the compound represented by the following general formula (I) or a salt thereof, by 1.0 mass % or more at 25° C., and is in a content of 50.0 mass % or more with respect to the total content of all water-soluble organic solvents contained in the ink jet black ink