JP2004026852A5 - - Google Patents

Claims (20)

A pigment dispersion containing at least a pigment, a dispersant, and water, wherein the pigment dispersion contains at least one compound represented by the following general formula (1) as a dispersant.
(R ¹ is H or an alkyl group having 1 to 20 carbon atoms, phenyl group, substituted phenyl group, naphthyl group, k is an integer of 0 to 7, A ¹ is an oxyethylene unit, an oxypropylene unit, or an oxyethylene unit and an oxypropylene. A ² is a mixed group with a unit, A ² is an oxyethylene unit, an oxypropylene unit or a mixed group of an oxyethylene unit and an oxypropylene unit, i and j are each an integer of 0 or more, and i + j is an integer of 31 to 100 .) The pigment dispersion according to claim 1, comprising at least one compound represented by the following general formula (2).
(R ² is an alkyl group having 8 to 14 carbon atoms, A ³ is an oxyethylene unit, an oxypropylene unit or a mixed group of an oxyethylene unit and an oxypropylene unit, and m represents an integer of 3 to 16) The pigment dispersion according to claim 1 or 2, which contains at least one compound represented by the following general formula (3).
[M ¹ is H, Li, Na, K, N ⁺ R ⁴ R ⁵ R ⁶ R ⁷ (R ⁴ , R ⁵ , R ⁶ , R ⁷ are a hydrogen element, a methyl group, an ethyl group, and a 2-hydroxyethyl group, respectively. And R ³ represents an alkyl group having 1 to 20 carbon atoms. ] The pigment dispersion according to any one of claims 1 to 3, which contains at least one compound represented by the following general formula (4).
[R ⁸ is an alkyl group having 1 to 20 carbon atoms, A ⁴ is an oxyethylene unit, an oxypropylene unit, or a mixed group of an oxyethylene unit and an oxypropylene unit, x is an integer of 1 to 12, M ² is H, Li, Na, K, N ⁺ R ⁹ R ¹⁰ R ¹¹ R ¹² (R ⁹ , R ¹⁰ , R ¹¹ , R ¹² are a hydrogen element, a methyl group, an ethyl group, a 2-hydroxyethyl group, and a 3-hydroxypropyl group, respectively. Selected from the group consisting of: ]   Pigment yellow 138 is used as a pigment, The pigment dispersion liquid in any one of Claims 1-4 characterized by the above-mentioned.   Pigment red 122 is used as a pigment, The pigment dispersion liquid in any one of Claims 1-4 characterized by the above-mentioned.   The pigment is at least one selected from the group consisting of Pigment Blue 15, Pigment Blue 15: 1, Pigment Blue 15: 2, Pigment Blue 15: 3, and Pigment Blue 15: 4. A pigment dispersion according to any one of the above.   Carbon pigment is used as a pigment, The pigment dispersion liquid in any one of Claims 1-4 characterized by the above-mentioned.   The content ratio of the compound of the general formula (1) and the compound of the general formula (2) is 99.99 / 0.01 to 60/40 by weight ratio, according to any one of claims 2 to 8, The pigment dispersion described.   The content ratio of the compound of the general formula (1) and the compound of the general formula (3) is 99.99 / 0.01 to 60/40 in weight ratio. The pigment dispersion described.   The content ratio of the compound of the general formula (1) and the compound of the general formula (4) is 99.99 / 0.01 to 60/40 in weight ratio. The pigment dispersion described.   The pigment dispersion according to any one of claims 1 to 11, wherein the ratio of the dispersant to the pigment is 1/15 to 1/1.   The pigment dispersion liquid according to any one of claims 1 to 12, wherein an average particle diameter of the pigment is 20 nm or more and 200 nm or less.   The pigment dispersion according to any one of claims 1 to 13, wherein the pigment concentration is 5 wt% or more and 30 wt% or less.   The pigment dispersion according to any one of claims 1 to 14, which is prepared by adding at least one of water, a water-soluble organic solvent, a surfactant and a preservative as an additive. Ink for inkjet.   The ink-jet ink according to claim 15, wherein the average particle diameter of the pigment is 20 nm or more and 200 nm or less.   The inkjet ink according to claim 15 or 16, wherein the pigment concentration is 1 wt% or more and 8 wt% or less.   An image forming method using an ink jet printer using the ink according to claim 15.   The image forming method according to claim 18, wherein printing is performed by an ink jet printer in which an Ingjet method is a piezo method.   19. The image forming method according to claim 18, wherein printing is performed by an ink jet printer in which the ink jet method is a thermal method.