Patent ID: 7578585
Filing Date: 2009-08-25
Classification: B41J,C09D

Abstract:
1. An ink cartridge for storing ink, comprising a thermal ink-jet head provided with a heat generating portion that generates thermal energy for ejecting the ink from an ejection opening, wherein: the heat generating portion has, on its surface in contact with the ink, a protective layer containing at least one selected from the group consisting of a silicon nitride and a silicon carbide; and the ink contains a substance that dissolves the protective layer and a compound represented by the following general formula (1), and a content X (% by mass) of the compound represented by the general formula (1) in the ink satisfies a relationship of 1 where A represents an alkylene or alkenylene group having 1 to 4 carbon atoms which forms a ring with a nitrogen atom, a carbonyl group and R 3 , R 1 and R 4 each independently represent any one of a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted acyl group, a carbamoyl group, a substituted or unsubstituted carboxyl group, and a substituted or unsubstituted sulfonyl group, R 2 represents a group bonded to an arbitrary carbon atom of A, R 2 representing any one of a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted acyl group, a carbamoyl group, a substituted or unsubstituted carboxyl group, and a substituted or unsubstituted sulfonyl group, n represents an integer of 0 to 4, and R 3 represents a carbon or nitrogen atom.