Patent ID: 7097701

Claim:
An ink containing a phthalocyanine compound represented by the formula (I): wherein X 1 to X 4 and Y 1 to Y 4 each independently represents a carbon atom or a nitrogen atom, A 1 to A 4 each independently represents an atomic group necessary for forming an aromatic ring or a heterocyclic ring together with X 1 to X 4 and Y 1 to Y 4 , and at least one of the four rings containing A 1 , X 1 and Y 1 ; A 2 , X 2 and Y 2 ; A 3 , X 3 and Y 3 ; and A 4 , X 4 and Y 4 is an aromatic ring represented by the formula (V-1), provided that all of four rings containing A 1 , X 1 and Y 1 ; A 2 , X 2 and Y 2 ; A 3 , X 3 and Y 3 ; and A 4 , X 4 and Y 4 do not represent an aromatic ring at the same time: in which G represents —SO-Z 1 , —SO 2 -Z 1 , —SO 2 NZ 1 Z 2 , —CONZ 1 Z 2 , —CO 2 Z 1 or —COZ 1 ; t1 represents an integer of 1 or 2; Z 1 's may be the same or different and each represents a substituted or unsubstituted alkyl group having from 1 to 20 carbon atoms in total, a substituted or unsubstituted cycloalkyl group having from 3 to 20 carbon atoms in total, a substituted or unsubstituted alkenyl group having from 2 to 20 carbon atoms in total, a substituted or unsubstituted alkynyl group having from 2 to 12 carbon atoms in total, a substituted or unsubstituted aralkyl group having from 7 to 20 carbon atoms in total, a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms in total, or a substituted or unsubstituted heterocyclic group having from 4 to 20 carbon atoms in total: Z 2 's may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group having from 1 to 20 carbon atoms in total, a substituted or unsubstituted cycloalkyl group having from 3 to 20 carbon atoms in total, a substituted or unsubstituted alkenyl group having from 2 to 20 carbon atoms in total, a substituted or unsubstituted alkynyl group having from 2 to 12 carbon atoms in total, a substituted or unsubstituted aralkyl group having from 7 to 20 carbon atoms in total, a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms in total, or a substituted or unsubstituted heterocyclic group having from 4 to 20 carbon atoms in total: and * represents a binding site to a phthalocyanine skeleton, A 1 to A 4 may each have a substituent; and at least one of A 1 to A 4 , or at least one of substituents of A 1 to A 4 has an ionically hydrophilic group as a substituent, and M represents a hydrogen atom, a metal element, a metal oxide, a metal hydroxide, or a metal halide.