Patent ID: 8206502

Claim:
A method for preparing a phthalocyanine composition comprising the steps of: synthesizing a crystalline product comprising a mixture of phthalocyanines including: a first phthalocyanine having the general formula A 4 PcM, a second phthalocyanine having the general formula A 3 BPcM, a third phthalocyanine having the general formula A 2 B 2 PcM, a fourth phthalocyanine having the general formula AB 3 PcM, and a fifth phthalocyanine having the general formula B 4 PcM, wherein: PcM in the above formulas, represents a member selected from the group consisting of moieties having the general structure: wherein M represents a pair of hydrogen atoms or a covalent or coordinate bonded moiety including an atom selected from the group consisting of Li, Na, K, Be, Mg, Ca, Ba, Sc, Y, La, Ac, Ti, Zr, Hf, V, Nb, Cr, Mo, W, Mn, Tc, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, and Sb; A and B are different and are selected from the group including hydrogen, halogen, alkyl, and alkoxy; A and B may represent more than one substituent on each isoindoline moiety of the PcM structure; and the mole fractions of starting materials are adjusted so that the crystalline mixture contains a majority of A 4 PcM, a lesser amount of A 3 BPcM, and traces of A 2 B 2 PcM, AB 3 PcM and B 4 PcM; and the synthesis is at a temperature of less than 150° C., and milling said mixture to form a pigment.