Colored fine particle dispersion, ink using the same, and ink-jet recording method
View Patent ↗The invention provides a colored fine particle dispersion wherein colored fine particles including a dispersible polymer having both of a hydrophilic polymer moiety and a hydrophobic polymer moiety which has a glass transition temperature (Tg) of 0° C. or less and an oil-soluble dye are dispersed in an aqueous medium; an ink using the same; and an ink-jet recording method using the ink. Preferably, a content of the hydrophobic polymer moiety is from 60 to 90% by mass, and a content of the hydrophilic polymer moiety is from 10 to 40% by mass.
1. A colored fine particle dispersion, wherein colored fine particles comprising a dispersible polymer having both of a hydrophilic polymer moiety and a hydrophobic polymer moiety which has a glass transition temperature (Tg) of 0° C. or less and an oil-soluble dye are dispersed in an aqueous medium,
wherein an oxidation potential of the oil-soluble dye is nobler than 1.0V (vs SCE),
wherein the oil-soluble dye is represented by the following formula (Y-1):
A-N═N—B Formula(Y-1)
in the formula (Y-1) A and B each independently represent a heterocyclic group which may have a substituent.
2. A colored fine particle dispersion according to claim 1 , wherein the hydrophobic polymer moiety constitutes 60 to 90% by mass of the dispersible polymer, and the hydrophilic polymer moiety constitutes 10 to 40% by mass of the dispersible polymer.
3. A colored fine particle dispersion according to claim 1 , wherein the hydrophilic polymer moiety is an anionic polymer or a nonionic polymer.
4. A colored fine particle dispersion according to claim 1 , wherein a solubility parameter (an SP value) of the oil-soluble dye is from 26 to 21 J 0.5 /cm 1.5 , and a molecular volume (a V value) thereof is from 810 to 270 cm 3 /mol.
5. A colored fine particle dispersion according to claim 2 , wherein the hydrophilic polymer moiety is an anionic polymer or a nonionic polymer.
6. A colored fine particle dispersion according to claim 5 , wherein a solubility parameter (an SP value) of the oil-soluble dye is from 26 to 21 J 0.5 /cm 1.5 , and a molecular volume (a V value) thereof is from 810 to 270 cm 3 /mol.
7. An ink comprising a colored fine particle dispersion wherein colored fine particles comprising a dispersible polymer having both of a hydrophilic polymer moiety and a hydrophobic polymer moiety which has a glass transition temperature (Tg) of 0° C. or less and an oilsoluble dye are dispersed in an aqueous medium, wherein the oil-soluble dye is represented by the following formula (Y-1):
A-N═N—B Formula(Y-1)
in the formula (Y-1), A and B each independently represent a heterocyclic group which may have a substituent.
8. An ink according to claim 7 , wherein the hydrophobic polymer moiety constitutes 60 to 90% by mass of the dispersible polymer, and the hydrophilic polymer moiety, which includes an anionic polymer or a nonionic polymer, constitutes 10 to 40% by mass in the dispersible polymer.
9. An ink according to claim 8 , wherein an oxidation potential of the oil-soluble dye is nobler than 1.0 V (vs SCE).
10. An ink according to claim 9 , wherein a solubility parameter (an SP value) of the oil-soluble dye is from 26 to 21 J 0.5 /cm 1.5 , and a molecular volume (a V value) thereof is from 810 to 270 cm 3 /mol.
11. An ink-jet recording method for recording an image onto a recording material with an ink comprising a colored fine particle dispersion wherein colored fine particles comprising a dispersible polymer having both of a hydrophilic polymer moiety and a hydrophobic polymer moiety which has a glass transition temperature (Tg) of 0° C. or less and an oil-soluble dye are dispersed in an aqueous medium, wherein the oil-soluble dye is represented by the following formula (Y-1):
A-N═N—B Formula(Y-1)
in the formula (Y-1), A and B each independently represent a heterocyclic group which may have a substituent.
12. An ink-jet recording method according to claim 11 , wherein the hydrophobic polymer moiety constitutes 60 to 90% by mass of the dispersible polymer, and the hydrophilic polymer moiety which includes an anionic polymer or a nonionic polymer constitutes 10 to 40% by mass in the dispersible polymer.
13. An ink-jet recording method according to claim 12 , wherein an oxidation potential of the oil-soluble dye is nobler than 1.0 V (vs SCE).
14. An ink-jet recording method according to claim 13 , wherein asolubility parameter (an SP value) of the oil-soluble dye is from 26 to 21 J 0.5 /cm 15 , and a molecular volume (a V value) thereof is from 810 to 270 cm 3 /mol.
15. An ink-jet recording method according to claim 14 , wherein a recording paper comprising a support and an ink-receiving layer which is provided on the support and includes porous inorganic fine particles is used as the recording material.
16. An ink-jet recording method according to claim 15 , wherein the porous inorganic fine particles are porous silica.
17. A colored fine particle dispersion according to claim 1 , wherein the oil-soluble dye is represented by the following Formula (Y-II):
in the formula (Y-II), R 1 and R 3 each independently represents a hydrogen atom, or a cyano, alkyl, cycloalkyl, aralkyl, alkoxy, alkylthio, arylthio, aryl or ionic hydrophilic group; R 2 represents a hydrogen atom, or an alkyl, cycloalkyl, aralkyl, carbamoyl, acyl, aryl or heterocyclic group; and R 4 represents a heterocycle.