| abstract |
A water base dye ink composition which comprises: (i) water as a solvent; (ii) a carboxyl group containing styrenic resin having an average weight of 1500-30000 and an acid value of 150-300, in an amount of 2-20% by weight; (iii) at least one anionic dye selected from the group consisting of: (a) a metal complex azo acid dye; (b) C.I. direct black; and (c) C.I. acid yellow 110, C.I. acid yellow 127, C.I. direct yellow 100, C.I. 20215, C.I. 20216, C.I. 20230, C.I. 23266, C.I. 23635, C.I. 40002, C.I. 40215, C.I. 42655 and C.I. 42660, in an amount of 0.01-10% by weight; and (iv) an alkali which is volatile at normal temperatures in such an amount as put the ink composition at a pH in the range of 6 to 9.5. |