申请人:Sao Akihito
公开号:US20070263058A1
公开(公告)日:2007-11-15
An ink composition comprising: a betaine-based surfactant represented by the following general formula (1), a defoaming agent in the form of a glycol ether represented by the following general formula (2), and/or a glycol ether represented by the following general formula (3):
(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, alkaline metal atom, ammonium group, protonated organic amino 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 by 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);
(wherein, R represents an alkyl group having 5 or 6 carbon atoms, and n represents an integer of 1 to 3);
(wherein, R represents an alkyl group having 4 to 6 carbon atoms, and n represents an integer of 1 to 3).