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. 20, 2011
Filed:
Apr. 28, 2009
Takashi Yoshimoto, Tokyo, JP;
Yoshiaki Kawaida, Tokyo, JP;
Takahiko Matsui, Tokyo, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a dye compound for black ink which has high solubility in media composed mainly of water and which is stable even when a high-concentration aqueous solution and ink are stored over a long term. The density of printed images is very high, and even if a high-concentration solution is used for printing, no bronzing occurs in the images, and black recorded images are provided with which all aspects of printed image durability, particularly light resistance and ozone gas resistance, are excellent. Also disclosed is an ink composition thereof. Trisazo compounds represented by general formula (1) or tautomers thereof or salts thereof are used as said dye compound for black ink. In formula (1), group A represents a 2-naphthothiazolyl group, Rrepresents a substitutable C1 to C4 alkyl group or the like, Rrepresents a cyano group or the like, Rand Rindependently represent a hydrogen atom, a sulfo group, or the like, Rto Rindependently represent a hydrogen atom, a substitutable C1 to C4 alkyl group, or a substitutable C1 to C4 alkoxy group, or the like, and Rto Rindependently represent a hydrogen atom, a substitutable C1 to C4 alkyl group, a substitutable C1 to C4 alkxy group, a substitutable C1 to C4 alkylthio group, or the like.