Patent ID: 7396398

Claim:
An ink composition comprising an amide compound represented by formula I, a coloring agent and a solvent: wherein R 1 , R 2 , R 3 and R 4 are independently a substituted or unsubstituted C 1 -C 20 heteroalkyl group, a substituted or unsubstituted C 2 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkoxy group, a substituted or unsubstituted C 1 -C 20 alkyl sulfonamide group, a substituted or unsubstituted C 6 -C 20 aryl sulfonamide group, a substituted or unsubstituted C 1 -C 20 acylamino group, a C 1 -C 20 alkylureido group, a C 6 -C 20 arylureido group, a C 2 -C 20 alkoxycarbonyl group, a C 2 -C 20 alkoxycarbonylamino group, a carbamoyl group, a sulfamoyl group, a sulfo group or its salt, a carboxy group or its salt, a substituted or unsubstituted C 1 -C 20 dialkylaminoalkyl group, a substituted or unsubstituted C 6 -C 20 pyridylalkyl group, a substituted or unsubstituted C 5 -C 20 pyridyl group, a substituted or unsubstituted C 6 -C 20 imidazolyl group, a hydrazine group, a hydrozone group, a substituted or unsubstituted C 1 -C 20 pyridylalkyl group, a substituted or unsubstituted C 6 -C 20 aryl group, a substituted or unsubstituted C 6 -C 20 arylalkyl group, a substituted or unsubstituted C 6 -C 20 heteroaryl group, C 6 -C 20 heteroarylalkyl group, a substituted or unsubstituted C 6 -C 20 heteroarylalkenyl group, or a substituted or unsubstituted C 3 -C 20 heterocycloalkyl group; or R 3 and R 4 link together to form an unsubstituted C 1 -C 20 alkylene group.