Methods of preparing aqueous colored pigment dispersions, and inkjet ink compositions

A technology of colored pigments and inkjet inks, applied in the direction of replication/marking methods, coupling reaction of azo dyes, inks, etc., can solve the problem of pigments not easy to disperse

Active Publication Date: 2006-04-19
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually, individual pigments are not easily dispersed in liquid vehicles

Method used

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  • Methods of preparing aqueous colored pigment dispersions, and inkjet ink compositions
  • Methods of preparing aqueous colored pigment dispersions, and inkjet ink compositions
  • Methods of preparing aqueous colored pigment dispersions, and inkjet ink compositions

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[0014] The present invention relates to a method for preparing an aqueous colored pigment dispersion and an inkjet ink composition.

[0015] The method of the present invention comprises the steps of combining a) a colored pigment, b) an azo coupler, c) an aromatic amine, d) a diazotizing agent, and e) an aqueous medium. Each of these components will be described in detail below. These components may be combined in any order and under any conditions to produce an aqueous colored pigment dispersion. For example, the color pigment and azo coupler can be combined, dry or in a liquid medium, to form a pretreated color pigment, which is subsequently combined with an aromatic amine and a diazotizing agent, preferably in an aqueous medium. Furthermore, the aromatic amine and the diazotizing agent may be combined in a liquid medium, preferably an aqueous medium, to form the diazonium salt. This can then be combined with the color pigments and / or azo couplers described above, or comb...

Embodiment 1

[0063] A rotor-stator high shear mixer (Silverson L4RT-A) was equipped with a 4 liter stainless steel beaker and the mixer was immersed in an ice bath. About 75 g of Pigment Yellow 74 and 1000 g of water were placed in a beaker and the mixture was homogenized at 7200 rpm for 15 minutes. A solution of 2.07 g (0.01 mol) of acetoacetyl-o-methoxybenzylamide in 20 mL of isopropanol was added thereto, and the mixture was stirred for a further 15 minutes.

[0064] In a separate vessel, 4.35 g (0.025 mol) of sulfanilic acid was mixed with 30 ml of 1N HCl and 1.73 g (0.025 mol) of sodium nitrite at 5-10°C to form the corresponding diazonium salt. This was then added to the mixture of Pigment Yellow 74 and acetoacetyl-o-methoxybenzylamide with stirring. Keep the temperature at about 10°C. The mixture was adjusted to pH 5-6 by dropwise addition of 5M sodium hydroxide solution. Mixing was continued for an additional 2 hours. By removing a small portion of the mixture and adding it in ...

Embodiment 2

[0068] A rotor-stator high shear mixer (Silverson L4RT-A) was equipped with a 4 liter stainless steel beaker and the mixer was immersed in an ice bath. About 75 g of Pigment Yellow 74 and 1000 g of water were placed in a beaker and the mixture was homogenized at 7200 rpm for 15 minutes. Then add 3.85g of compound I shown below (at pH 4.5-6.0, using a diazonium salt and an azo coupler in a molar ratio of 1:1, by mixing the diazonium salt of sulfanilic acid with acetoacetyl-o-methoxy prepared by azo coupling) in 200 mL of water. The mixture was then stirred for a further 2 hours.

[0069]

[0070] Compound I

[0071] The mixture was transferred to a Telsonic flow-through sonicator and sonicated for 2 hours to prepare an aqueous color pigment dispersion. The resulting yellow pigment dispersion was purified using a 50 nm diafiltration membrane column and concentrated to 10% solids. The median particle size of the bright yellow dispersion is about 150 ...

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Abstract

The present invention describes methods for preparing aqueous colored pigment dispersions comprising the step of combining, in any order, a) a colored pigment, b) an azo coupler, c) an aromatic amine, d) a diazotizing agent, and e) an aqueous medium, wherein the aromatic amine comprises as least one ionic group, at least one ionizable group, or a mixture of at least one ionic group and at least one ionizable group. These colored pigment dispersions are particularly useful as an inkjet ink composition. Also disclosed are inkjet ink compositions comprising a) a liquid vehicle, b) a colored pigment, and c) a dispersant having the formula: D-N=N-AC, wherein AC is an azo coupling component and D is a diazo component comprising at least one ionic group, at least one ionizable group, or a mixture of at least one ionic group or ionizable group.

Description

technical field [0001] The present invention relates to a process for the preparation of aqueous colored pigment dispersions. Inkjet ink compositions are also disclosed. Background technique [0002] Usually, individual pigments are not readily dispersible in liquid vehicles. Various techniques have been developed to provide stable pigment dispersions. For example, dispersants can be added to pigments to improve their dispersibility in specific media. Examples of dispersants used in aqueous media include water-soluble polymers and surfactants. [0003] Colored pigment dispersions have been prepared using dispersants having structural units similar (otherwise identical) to those of the color pigment. For example, GB2356866 discloses bis-azo compounds derived from diazotized (carboxy / sulfo)-aniline and 1,4-bis(acetoacetamido)phenylene and their use in pigment and ink compositions . These materials were found to be particularly useful in combination with yellow or orange ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/00C09B41/00C09D11/00C09B67/22C09D17/00
CPCC09B41/00C09D11/326C09D17/001C09B67/0041C09D11/322C09B67/00C09D17/00C09B67/0084C09B67/006B41M5/00
Inventor 亚历山大·I·沙克诺维奇
Owner CABOT CORP
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