Patent ID: 7556681

Claim:
An ink-jet ink comprising at least water and an organic solvent having a boiling point of not less than 150° C. in an amount of not less than 50 weight % and not more than 80 weight % based on the total weight of the ink, wherein the organic solvent comprises an alkane diol represented by Formula (1) or (2) in an amount of not less than 45 weight % and not more than 70 weight % based on the total weight of the ink, and a glycol mono-ether represented by Formula (3) in an amount of not less than 5 weight % and not more than 15 weight % based on the total weight of the ink: R 1 —CH(OH)—CH(OH)—R 2 Formula (1) wherein R 1 is a hydrogen atom or a methyl group, R 2 is a hydrogen atom, a methyl group, an ethyl group, or a propyl group; R 1 —CH(OH)—CH 2 —CH(OH)—R 2 Formula (2) wherein R 1 is a hydrogen atom or a methyl group, R 2 is a hydrogen atom, a methyl group, an ethyl group, or a propyl group; CH 3 —O—R 3 —OH Formula (3) wherein R 3 is a branched-chain bivalent saturated hydrocarbon group.