| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water-based black ink composition for inkjet recording, which has excellent color tone and scratch resistance. <P>SOLUTION: The water-based black ink composition for inkjet recording includes: a carbon black pigment whose surface is coated with a first dispersant polymer containing a structural unit represented by a general formula (1); at least one kind of coloring pigment selected from the group consisting of a phthalocyanine pigment, a quinacridone pigment and an azo pigment; a coloring pigment whose surface is coated with a second dispersant polymer consisting of a structural unit group same as that of the first dispersant polymer or the first dispersant polymer; and an aqueous medium (in the formula: R<SP POS="POST">1</SP>denotes a hydrogen atom, a methyl group or the like; L<SP POS="POST">1</SP>denotes -COO-, -OCO-, -CONR<SP POS="POST">2</SP>-, -O- or a phenylene group; R<SP POS="POST">2</SP>denotes a hydrogen atom or an alkyl group; and L<SP POS="POST">2</SP>denotes a single bond or a bivalent linking group). <P>COPYRIGHT: (C)2012,JPO&INPIT |
