Patent ID: 7540909
Filing Date: 2009-06-02
Classification: C09B,C09D

Abstract:
1. 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): 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 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.