Process for the production of water containing carbon black preparations

DETAILED DESCRIPTION We claim: 1.
A process for the production of water containing carbon black preparations comprising producing furnace blacks, lamp blacks or gas blacks in a continuous production process, separating said blacks from exhaust gases, continuously feeding the blacks to a pin shaft granulator used for the production of carbon black granules wherein the water is adjusted such that the preparations contain between 30 and 80% of water, thereby obtaining well dispersable preparations in the form of a non-dusting powder, beads, or liquid, and then packaging said preparations.
2.
The process for the production of aqueous carbon black preparations as in claim 1, wherein a wetting and/or dispersing agent is also introduced into the apparatus during production.
3.
The process as in claim 1 or 2, wherein lignin sulfonic acids are used as dispersing agents.
4.
The process as in claim 1, in which the carbon black used has the following characteristics:
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Nitrogen surface area
m.
sup.
2 /g
25-130
Electron microscopic
nm 18-55
particle size
DBP-number ml/100g 45-100
Color strength, related
% 60-120
to IRB 3
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5.
The process as in claim 4, wherein the carbon black used has a DBP-number of 90-140 ml/100 g.




Description:
Carbon black is used in the paper industry as a black pigment in the production of black, gray or shaded paper or cardboard.
Carbon black, as compared to organic dyes and colored pigments is relatively cheap and is absolutely stable against light and chemicals.
Furthermore, when working carbon black into paper or cardboard pulps it produces an excellent intensity of color and has a covering power compared to other color tints, such as white or brown of the paper/cardboard pulp, which is greater than is the case with other black pigments