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Modified organic colorants and dispersions, and methods for their preparation.

A technology of organic colorants and dispersions, applied in organic dyes, inks, household utensils, etc., can solve the problem of difficult dispersion of pigments

Active Publication Date: 2006-07-19
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A 4 liter stainless steel beaker was equipped on a rotor-stator high shear mixer (Silverson L4RT-A). The beaker was filled with 1,000 mL deionized water and 4.0 g sodium hydroxide. After the sodium hydroxide was dissolved, about 50 g of Pigment Yellow 155 (InkJet Yellow 4G, manufactured by Clariant Corp.) was added at a time. The pigment was quickly wetted, and the mixture was homogenized for 2 hours at 7,200 rpm. Due to the shear exotherm, the temperature of the reaction mixture was maintained at 60°C. It was found that the median particle diameter of the modified organic colorant obtained in the dispersion was 350 nm.

[0051] Then, the dispersion was transferred to a Telsonic(R) flow-through sonicator and sonicated for 2 hours. The pH of the obtained modified yellow pigment dispersion was carefully adjusted to 7.5-8.0 with 0.1N hydrochloric acid. Then, using a 50nm diafiltration membrane column, the dispersion was diafiltered and concentrated to 10% solids. The median pa...

Embodiment 2

[0054] A stainless steel beaker with a magnetic stirring rod is installed on the stirrer-hot plate, and is further equipped with a peristaltic pump and a flow-through ultrasonic treatment cell (Misonix 3000) to simultaneously heat, stir and circulate the mixture added to the beaker through ultrasonic waves Treatment pool. A mixture of 30 g of Pigment Yellow 155 (InkJet Yellow 4G, manufactured by Clariant Corp.) and 300 mL of deionized water was added thereto. The mixture is circulated through a flow-through ultrasonic treatment cell. Adjust the heater to 60°C. After that, 60 mL of 1N sodium hydroxide solution was added, and the mixture was circulated and sonicated for 3 hours. It was found that the median particle diameter of the obtained modified organic colorant dispersion was 200 nm.

[0055] With 0.1N hydrochloric acid, the pH of the yellow dispersion was carefully adjusted to pH 7.5-8.0. Then, using a 50nm diafiltration membrane column, the dispersion was diafiltered and conc...

Embodiment 3

[0058] The modified yellow pigment dispersions from Examples 1 and 2 were used to formulate inkjet ink compositions. Thus, 5 mL of each pigment dispersion is combined with 5 mL of ink vehicle, which contains 37.6% 2-pyrrolidone, 5.4% pentane-1,5-diol, 6.0% isopropanol, 0.1% Surfynol 465 and the balance water. Then, these inks are filtered through a 450nm syringe filter, enter the Hewlett-Packard 2000C print head, and use HP 2000C to print yellow square patterns on HP BrightWhite Inkiet paper and HP Premium Plus Photo paper. The patterns obtained by each ink have excellent visual print quality and a maximum optical density equal to 1.2-1.3 at 400 nm.

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Abstract

The present invention relates to methods of preparing modified organic colorant dispersions comprising the step of combining, in any order, i) an organic colorant; ii) an hydroxide reagent; and iii) an aqueous medium, to form a modified organic colorant dispersion. The methods further comprises a particle size reduction step. These steps can occur in either order. The organic colorant comprises at least one organic species having at least one ester group. Modified organic colorants and inkjet ink compositions are also disclosed.

Description

Technical field [0001] The invention relates to a method for preparing a modified organic colorant and its dispersion. Also disclosed are modified organic colorants and inkjet ink compositions. Background technique [0002] Generally, pigments are not easily dispersed in liquid vehicles by themselves. Various technologies have been developed to provide stable pigment dispersions. For example, a dispersant can be added to the pigment to improve its dispersibility in a specific medium. Examples of dispersants used in aqueous media include water-soluble polymers and surfactants. In addition, water-soluble pigment derivatives substituted with acidic functional groups or salts (such as those described in US Patent No. 6,451,103) have also been used to prepare aqueous pigment dispersions. [0003] Dispersants with chemical units similar to, if different from, color pigments have been used to prepare color pigment dispersions. For example, GB2356866 discloses a bisazo compound derived f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/08C09D11/00C09B67/00C09B67/10
CPCC09B67/0022C09B67/0014C09D11/322
Inventor 亚历山大·I·沙克诺维奇
Owner CABOT CORP