Patent ID: 7270703

Claim:
An ink comprising a phthalocyanine compound represented by the following general formula (I): in the general formula (I), X 1 , X 2 , X 3 , and X 4 each independently represents —SO—Z and/or —SO 2 —Z, wherein each of X 1 , X 2 , X 3 , and X 4 is at a β-position of general formula (I), wherein each Z independently represents 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 group, or a substituted or unsubstituted heterocyclic group, Y 1 , Y 2 , Y 3 , and Y 4 each independently represents a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, an aralkyl group, an aryl group, a heterocyclic group, a cyano group, a hydroxyl group, a nitro group, an amino group, an alkylamino group, an alkoxy group, an aryloxy group, an amide group, an arylamino group, an ureido group, a sulfamoylamino group, an alkylthio group, an arylthio group, an alkoxycarbonylamino group, a sulfonamide group, a carbamoyl group, an alkoxycarbonyl group, a heterocyclic oxy group, an azo group, an acyloxy group, a carbamoyloxy group, a silyloxy group, an aryloxycarbonyl group, an aryloxycarbonylamino group, an imide group, a heterocyclic thio group, a phosphoryl group, or an acyl group, and each group may be further substituted, provided that at least one of X 1 , X 2 , X 3 , X 4 , Y 1 , Y 2 , Y 3 , and Y 4 represents a substituent having 2 or more carbon atoms, and the total sum of carbon atoms of the substituents represented by X 1 , X 2 , X 3 , X 4 , Y 1 , Y 2 , Y 3 , and Y 4 is 8 or more, a 1 to a 4 , and b 1 to b 4 each represents a number of the substituents of X 1 to X 4 , and Y 1 to Y 4 ; a 1 to a 4 each independently represents an integer of from 1 to 4; and b 1 to b 4 each independently represents an integer of from 0 to 4, and M represents a hydrogen atom, a metal element, or an oxide, a hydroxide or a halide thereof.