Dye mixture and ink containing the same
A novel compound having sufficiently high fastness to light, heat, humidity and active gas in the environment and a coloring composition using the compound, particularly, an ink for ink jet recording, an ink jet recording method and a method for improving the preservability of formed image, which can form an image having high fastness to light and ozone gas in the environment. A phthalocyanine dye mixture having a specific structure and an ink, an ink for ink jet recording, an ink jet recording method and a method for improving the preservability of formed image, using the phthalocyanine dye mixture.
1. A dye mixture comprising a plurality of different dyes represented by the following formula (I):
wherein M represents a hydrogen atom, a metal atom or an oxide, hydroxide or halide thereof; Pc represents a (k+l+m+n)-valent phthalocyanine nucleus represented by formula (II); X 1 , X 2 , X 3 and X 4 each independently represents a substituent selected from the group consisting of —SO—R 1 , —SO 2 —R 1 , —SO 2 NR 2 R 3 , —CONR 2 R 3 , —CO 2 —R 1 and CO—R 1 and each of four benzene rings {A, B, C and D in formula (II)} of the phthalocyanine nucleus has at its β-position at least one substituent of X 1 , X 2 , X 3 and X 4 , provided that the case where X 1 , X 2 , X 3 and X 4 all are the same is excluded and at least one of X 1 , X 2 , X 3 and X 4 has an ionic hydrophilic group as a substituent; R 1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; R 2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; R 3 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; k, l, m and n represent an integer of 0<k<8, an integer of 0<l<8, an integer of 0≦m<8 and an integer of 0≦n<8, provided that k and/or l and/or m and/or n each independently represents a number satisfying 4≦k+l+m+n≦8; and Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , Y 6 , Y 7 and Y 8 each independently represents a hydrogen atom and/or a monovalent substituent and these monovalent substituents each may further have a substituent.
2. The dye mixture as claimed in claim 1 , wherein the phthalocyanine nucleus represented by formula (II) is represented by the following formula (III):
3. The dye mixture as claimed in claim 1 , wherein in the dye represented by formula (I), X 1 , X 2 , X 3 and X 4 each independently represents a substituent selected from the group consisting of —SO—R 1 , —SO 2 —R 1 and —SO 2 NR 2 R 3 .
4. The dye mixture as claimed in claim 1 , wherein the dye represented by formula (I) is represented by the following formula (IV):
wherein M represents a hydrogen atom, a metal atom or an oxide, hydroxide or halide thereof; Pc represents a (k+l)-valent phthalocyanine nucleus represented by formula (III); X 1 and X 2 each independently represents a substituent selected from the group consisting of —SO—R 1 , —SO 2 —R 1 and —SO 2 NR 2 R 3 and at least one substituent represented by X 1 and at least one substituent represented by X 2 are present in respective rings of four benzene rings {A, B, C and D in formula (III)} of the phthalocyanine nucleus, provided that X 1 and X 2 are not the same and at least one of X 1 and X 2 has an ionic hydrophilic group as a substituent; R 1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; R 2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; R 3 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; k and l represent an integer of 0<k<8 and an integer of 0<l<8, provided that k and/or l each independently represents a number satisfying 4≦k+l≦8.
5. The dye mixture as claimed in claim 1 , wherein in formulae (I) and (II), at least one group of X 1 to X 4 and Y 1 to Y 8 has at least one asymmetric carbon.
6. An ink comprising the dye mixture claimed in claim 1 .
7. An ink as claimed in claim 6 , which is used as an ink for ink jet recording.
8. An ink jet recording method comprising forming an image using the ink claimed in claim 7 on an image-receiving material comprising a support having thereon an ink image-receiving layer containing a white inorganic pigment particle.
9. A method for improving ozone resistance of a colored image material, comprising forming an image using the ink claimed in claim 7 .