Patent ID: 7125447

Claim:
An oil-based ink composition for ink jet recording, wherein the oil-based composition consists essentially of: (1) 0.5 to 25% by weight of a colorant, (2) a binder resin that is 0.5 to 3 times as much as an amount of the colorant added, (3) a dispersant in an amount of 5 to 200% by weight with respect to the amount of the colorant added, (4) at least 50% by weight of a mixed solvent obtained by mixing 20/63 to 52/30 parts by weight of a lactone-type solvent with 1 part by weight of polyoxyethylene glycol dialkyl ether represented by the following general formula (1), and (5) 0.01 to 48% by weight of at least one solvent selected from the group consisting of polyoxyethylene glycol monoalkyl ether represented by the following general formula (2), polyoxypropylene glycol monoalkyl ether represented by the following general formula (3), and triethyl citrate: R 11 —(OC 2 H 4 ) n —OR 12 General Formula (1) wherein R 11 and R 12 represent alkyl groups having 1 to 3 carbon atoms and can be the same or different, and n is integer of 2 to 4, R 21 —(OC 2 H 4 ) n —OH General Formula (2) wherein R 21 represents alkyl groups having 1 to 6 carbon atoms, and n is integer of 3 to 6, and R 31 —(OC 3 H 6 ) n —OH General Formula (3) wherein R 31 represents alkyl groups having 1 to 4 carbon atoms, and n is an integer of 2 to 3.