| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ink composition and an inkjet ink that have the permeability to an image receiving paper, and have water-soluble properties and quick-drying properties. <P>SOLUTION: The ink composition includes at least one dye being an azo compound shown by general formula (1) in an aqueous medium. In the formula, A denotes a substituted or unsubstituted aryl group or a substituted or unsubstituted nitrogen-containing five-membered heterocyclic group; G denotes a nitrogen atom or -C(R<SB POS="POST">2</SB>)=; R<SB POS="POST">2</SB>denotes a hydrogen atom, a sulfo group, a carboxy group, a substituted or unsubstituted carbamoyl group or a cyano group; Y<SB POS="POST">2</SB>, Y<SB POS="POST">3</SB>and Y<SB POS="POST">4</SB>each independently denote a hydrogen atom or a monovalent substituent; Y<SB POS="POST">2</SB>, Y<SB POS="POST">3</SB>and Y<SB POS="POST">4</SB>may be combined together to form a ring; all of Y<SB POS="POST">2</SB>, Y<SB POS="POST">3</SB>and Y<SB POS="POST">4</SB>do not denote a hydrogen atom at the same time; and Ms each independently denote a hydrogen atom or a monovalent counter-cation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
