Patent ID: 8025722

Claim:
An ink jet ink comprising at least a coloring material and a water-soluble organic solvent; wherein the water-soluble organic solvent comprises a branched alkanediol having hydroxyl groups at both terminals of its main chain and at least one of a compound represented by the following general formula (1) and a compound represented by the following general formula (2): R 1 -[A]-R 2 General formula (1) wherein A is —S—, —S(═O)— or —S(═O) 2 —; and R 1 and R 2 are each independently a hydrogen atom, a hydroxyl group, an alkyl group, a hydroxyalkyl group, an alkenyl group, an acyl group, a carbamoyl group, a carboxyl group or a sulfonyl group, provided that R 1 and R 2 are not simultaneously hydrogen atom(s) and/or hydroxyl group(s); and wherein R 3 and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, a hydrogen atom, a hydroxyl group, a carboxyl group or a sulfonyl group; R 4 is a hydrogen atom, hydroxyl group, substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, carboxyl group or sulfonyl group which is bonded to any carbon atom except for the nitrogen atoms and carbonyl group that constitute the five-membered ring; and n is an integer of 0 to 4.