Modified carbon black carbon black dispersion liquid and water base ink

A technology for modifying carbon black and water-based inks, which can be used in inks, printing, copying/marking methods, etc., and can solve problems such as insufficient OD value.

Inactive Publication Date: 2005-11-02
SEIKO EPSON CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this carbon black for water-based ink has a problem of insufficient OD value, especially when it is used as an inkjet ink.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A

[0042] The modified carbon black of this embodiment A is a modified carbon black in which lactone groups and carboxyl groups are introduced on the surface, and the ratio of the average particle diameter to the primary particle diameter is 8.5 or more, although the average particle diameter is as large as 150 -250nm, the sedimentation rate is also 30% or less.

[0043]The modified carbon black is obtained by oxidation treatment of such carbon black: the primary particle size (the range of the average value of the primary particle size) is 11-18nm, and the BET specific surface area is at least 180m 2 / g, preferably 180-260m 2 / g, the DBP oil absorption is at least 180mL / 100g, preferably 180-300mL / 100g, more preferably 190-250mL / 100g, and the specific surface area (m) of the unit DBP oil absorption (mL / 100g) 2 / g) in the range of 0.75-1.3.

[0044] The specific surface area per unit DBP oil absorption (specific surface area / DBP oil absorption) and the ratio of the average parti...

Embodiment approach B

[0088] The modified carbon black of the present embodiment B is a modified carbon black that can be dispersed and / or dissolved in water without a dispersant. The carbon black capable of dispersing and / or dissolving in water without a dispersant in Embodiment B is: the surface of the pigment is directly or indirectly bonded with many hydrophilic functional groups and / or through alkyl groups, alkyl ether groups, aryl groups, etc. or its salt (hereinafter referred to as dispersibility-imparting group), it is carbon black that can be dispersed and / or dissolved in an aqueous medium without a dispersant. Here, "dispersed and / or dissolved in an aqueous medium without a dispersant" means a state in which carbon black stably exists in an aqueous medium with a dispersible minimum particle size without using a dispersant. Here, the "dispersible minimum particle size" means the particle size of carbon black that cannot become smaller than this value even if the dispersion time is increase...

Embodiment A

[0127] The preparation of carbon black dispersion a (the carbon black of applicable embodiment A)

[0128] The primary particle diameter=18nm, BET specific surface area=185m prepared by furnace method 2 Add 200 g of carbon black raw material powder of / g, DBP oil absorption=200mL / 100g, BET specific surface area / DBP oil absorption=0.93 in 1500 g of ion-exchanged water, and heat up to 50° C. while stirring with a dissolver. Thereafter, add an aqueous solution of 2220 g of sodium hypochlorite (available chlorine concentration 12%) dropwise at 50-60° C. for 3.5 hours, add glass beads with a diameter of 3 mm after the dropwise addition, and stir at 50° C. for 30 minutes to obtain a solution containing modified carbon black reaction solution. The reaction solution was filtered through a 400-mesh metal mesh, and glass beads, unreacted carbon black, and the reaction solution were separated. Add 5% sodium hydroxide aqueous solution to the separated reaction solution, after adjusting ...

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Abstract

There are provided a carbon black according to which long-term stable storage is possible, clogging is not prone to occurring, and the OD value is high and hence printing with a deep black color is possible, or a carbon black that can be used in a water-based ink that is used in ink jet printer printing, that has low settleability and can thus be stored stably for a long period, for which clogging is not prone to occurring, and for which the reflection density is high and hence printing with a high printing density and a deep black color is possible, a carbon black dispersion having the carbon black dispersed therein, and a water-based ink containing the carbon black. An embodiment of a modified carbon black of the present invention is a modified carbon black obtained by carrying out oxidation treatment on a carbon black having a primary particle diameter of 11 to 18 nm, a BET specific surface area of at least 180 m2/g, a DBP oil absorption of at least 180 mL/100 g, and a value of the BET specific surface area (m2/g) divided by the DBP oil absorption (mL/100 g) of 0.75 to 1.3, and is characterized in that at least lactone groups and carboxyl groups are introduced onto the surface thereof, and the ratio of the mean particle diameter to the primary particle diameter is at least 8.5. Moreover, a carbon black dispersion and a water-based ink of the present invention contain this modified carbon black.

Description

technical field [0001] The present invention relates to modified carbon black, in particular, to carbon black used in black inks such as recording inks for inkjet printers, inks for pens, inks for stamps, and carbon black dispersions formed by dispersing the carbon black, and Contains its water-based ink. Background technique [0002] Carbon black is widely used as a colorant for water-based inks for printing black in inkjet printers. [0003] Generally, the raw material powder of carbon black is a secondary aggregate called an aggregate, and the secondary aggregate is an agglomerate of primary aggregates formed by aggregating roughly spherical primary particles through van der Waals force or only Formed by aggregation, attachment, entanglement, etc. Such carbon black raw material powder does not disperse in water and immediately settles in an untreated state. [0004] A water-based ink containing such raw material powder and a dispersant for dispersing it has high viscos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/48C09D11/17C09D11/18C09D11/324
Inventor 百濑雅之金谷美春伊东草子柳生龙哉
Owner SEIKO EPSON CORP
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