Patent ID: 7540908

Claim:
An ink composition comprising: a betaine-based surfactant represented by the following general formula (1) and a linear saturated aliphatic alcohol having a hydroxyl value of 1 to 2 and 4 to 6 carbon atoms: (R) p —N-[L-(COOM) q ] r Formula (1) wherein, R represents a hydrogen atom, alkyl group, aryl group or heterocyclic Group; L represents a divalent or more linking group; M represents a hydrogen atom, alkali metal atom, ammonium group, protonated organic amine or nitrogen-containing heterocyclic group or quaternary ammonium ion group, or represents a group that does not exist as a cation in the case of being a counter ion of an ammonium ion formed of an N atom in formula (1); q represents an integer of 1 or more; r represents an integer of 1 to 4; p represents an integer of 0 to 4; p+r is 3 or 4; N is a nitrogen atom that composes a quaternary amine in the case p+r is 4; R may be the same or different when p is 2 or more; COOM may be the same or different when q is 2 or more; and L-(COOM) q may be the same or different when r is 2 or more.