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Water-dispersible carbon black pigment and process for producing aqueous dispersion thereof

A water-based dispersion and water-based pigment technology, applied in the direction of pigment slurry, fibrous filler, ink, etc., can solve the problem of insufficient dispersion of carbon black agglomerates, and achieve excellent filterability, excellent paper fixing concentration, good gloss degree of effect

Inactive Publication Date: 2008-10-08
TOKAI CARBON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not sufficient to break up carbon black clumps

Method used

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  • Water-dispersible carbon black pigment and process for producing aqueous dispersion thereof
  • Water-dispersible carbon black pigment and process for producing aqueous dispersion thereof

Examples

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Embodiment 1

[0047] Carbon black A and carbon black B with the characteristics shown in Table 1 were used

[0048] Table 1

[0049] A

B

N 2 SA(m 2 / g)

DBP (cm 3 / 100g)

Tint(%)

290

98

156

135

56

145

[0050] Carbon black A: Tokablack #8500 (manufactured by Tokai Carbon Co., Ltd.)

[0051] Carbon black B: Tokablack #7550F (manufactured by Tokai Carbon Co., Ltd.)

[0052] Carbon Black A and Carbon Black B were oxidized separately using the following methods.

[0053] 3000 ml of 2.0N sodium peroxodisulfate (aqueous oxidant solution) and 150 g of carbon black were put into the stirring tank. The carbon black was oxidized with stirring to prepare a carbon black slurry. The carbon black was oxidized at 60° C. for 10 hours with a stirring speed of 300 rpm.

[0054] After oxidation the carbon black is filtered from the slurry and neutralized with sodium hydroxide. The resulting product was place...

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Abstract

A water-dispersible carbon black pigment excellent in water dispersibility and ink performance; and a process for producing an aqueous carbon black dispersion. The water-dispersible carbon black pigment comprises a mixture of a carbon black (A) having a nitrogen-adsorption specific surface area of 150 m<2> / g or larger, a DBP absorption of 95 cm<3> / 100 g or higher, and a specific coloring power of 120% or higher and a carbon black (B) having a nitrogen-adsorption specific surface area smaller than 150 m<2> / g, a DBP absorption less than 95 cm<3> / 100 g, and a specific coloring power of 120% or higher in a proportion of from 20:80 to 80:20 by weight, these carbon blacks having undergone a surface oxidation treatment and a neutralization treatment, and at least the carbon black (A) having undergone a disaggregation treatment. The process comprises separately dispersing the carbon black (A) and the carbon black (B) in an aqueous oxidizing agent solution to conduct an oxidation treatment, subjecting these carbon blacks to a neutralization treatment, subjecting at least the carbon black (A) to a disaggregation treatment, thereafter purifying them, subsequently mixing the carbon black (A) with the carbon black (B) in a proportion of from 20:80 to 80:20 by weight, and then dispersing the resultant water-dispersible carbon black pigment into an aqueous medium.

Description

technical field [0001] The invention relates to a carbon black water-based pigment suitable for water-based black inks such as inkjet printers and the like, and also relates to a method for preparing an aqueous dispersion in which the carbon black water-based pigment is dispersed. Background technique [0002] Since carbon black is hydrophobic and has low wettability with water, it is extremely difficult to disperse it stably in high concentration in water. This is because the number of functional groups with high affinity for water molecules present on the surface of carbon black is extremely small (for example, hydrophilic hydrogen-containing functional groups such as carboxyl groups and hydroxyl groups). Therefore, attempts have been made to improve the dispersibility of carbon black in water by oxidizing carbon black to form hydrophilic functional groups on its surface. [0003] For example, JP-A-48-018186 discloses a method for oxidizing carbon black with an aqueous hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/56C09C3/04
CPCC09C1/565C01P2006/12C01P2006/19C09D11/324C09D17/005C09C1/56C09C3/04
Inventor 中田英尚新井启哲
Owner TOKAI CARBON CO LTD
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