Ink composition, ink set including the composition, cartridge including the ink set, and inkjet recording apparatus including the cartridge

An ink composition comprising:

• a cyclic silazane-based compound represented by Formula 1 below;
• a colorant;
• and
• a solvent:
• wherein,
• R1 through R5 are each independently hydrogen, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C1-C20 heteroalkyl group, a substituted or unsubstituted C2-C20 alkenyl group, a substituted or unsubstituted C1-C20 alkoxy group, a substituted or unsubstituted C1-C20 heteroalkoxy group, a substituted or unsubstituted C1-C20 alkylsulfonamide group, a substituted or unsubstituted C6-C20 arylsulfonamide group, a substituted or unsubstituted C1-C20 acylamino group, a C1-C20 alkylureido group, a C6-C20 arylureido group, a C2-C20 alkoxycarbonyl group, a C2-C20 alkoxycarbonylamino group, a carbamoyl group, a sulfamoyl group, a sulfo group or its salt, a carboxyl group or its salt, a substituted or unsubstituted C1-C20 hydroxyalkyloxyalkyl group, a substituted or unsubstituted C1-C20 dialkylaminoalkyl group, a substituted or unsubstituted C6-C20 pyridylalkyl group, a substituted or unsubstituted C5-C20 pyridyl group, a substituted or unsubstituted C6-C20 imidazolyl group, a hydrazine group, a hydrazone group, a substituted or unsubstituted C1-C20 pyridylalkyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C6-C20 arylalkyl group, a substituted or unsubstituted C6-C20 heteroaryl group, a substituted or unsubstituted C6-C20 heteroarylalkyl group, a substituted or unsubstituted C6-C20 heteroaryloxy group, a substituted or unsubstituted C6-C20 heteroarylalkenyl group, a substituted or unsubstituted C3-C20 cycloalkyl group, or a substituted or unsubstituted C3-C20 heterocycloalkyl group;
• and
• Z comprises a —(CH2)m— group where m is an integer ranging from 1 to 10, and at
• least one methylene group is substituted by an oxygen, sulfur,
• a substituted or unsubstituted C1-C10 alkylene group, a substituted or unsubstituted C1-C10 heteroalkylene group having 1-9 heteroatoms, or a substituted or unsubstituted C1-C10 alkenylene group where R6, R7, and R8 are each independently hydrogen, a substituted or unsubstituted C1-C20 alkyl group, or a substituted or unsubstituted C2-C20 alkenyl group.