Patent ID: 8083341
Filing Date: 2011-12-27
Classification: B41J,C09D

Abstract:
1. An ink cartridge for storing ink comprising: a thermal ink-jet head provided with a heating portion that generates thermal energy for discharging ink from an ejection orifice, wherein the heating 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 oxide, a silicon nitride, and a silicon carbide, wherein the ink contains a substance that dissolves the protective layer, wherein the ink contains a compound represented by the following general formula (1), wherein the content X (% by mass) in the ink of the compound represented by the general formula (1) satisfies the relationship of 1≦X≦30, and wherein the substance that dissolves the protective layer contains at least one selected from the group consisting of compounds represented by the following general formulae (2) and (3): wherein A represents one selected from the group consisting of —S—, —S(═O)—, and —S(═O) 2 —, and R 1 and R 2 each independently represent a group selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkyl group, a hydroxyalkyl group, an alkenyl group, an acyl group, a carbamoyl group, a carboxyl group, and a sulfonyl group; wherein X 1 , X 2 , X 3 , and X 4 each independently represent —SO—Z, —SO 2 —Z, —SO 2 NR 1 R 2 , a sulfonic acid group, —CONR 2 R 2 , or —CO 2 R 1 , wherein Z is a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl, or a substituted or unsubstituted heterocyclic group, and R 1 and R 2 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl, or a substituted or unsubstituted heterocyclic group; Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , Y 6 , Y 7 , and Y 8 are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a cyano group, a substituted or unsubstituted alkoxy group, an amide group, an ureido group, a sulfonamide group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted alkoxycarbonyl group, a carboxyl group, or a sulfonic acid group; and a 1 , a 2 , a 3 , and a 4 represent the numbers of substituents of X 1 , X 2 , X 3 , and X 4 , respectively, and are each independently 1 or 2; wherein R 1 , R 2 , Y 1 and Y 2 are each independently a monovalent group, X 1 and X 2 each independently an electron-withdrawing group having a Hammett σp value of 0.20 or more, Z 1 and Z 2 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, and M is a hydrogen atom, an alkali metal, ammonium, or organic ammonium, and wherein the ejection orifice and the heating portion are disposed opposite to each other.