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US 4,615,852 AGranted
Method for producing nitrocellulose-based carbon black concentrates in the form of chips
AssigneeDegussa AG
InventorsClaus R. Engel, Lutz Dworowy
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Abstract
The invention relates to a method for producing nitrocellulose-based carbon black in the form of chips. The recipe constituents are blended into a mixture and converted at an elevated temperature into a dispersion in a suitable device which achieves the desired degree of kneading such as a kneading machine or roller die extruder. The dispersion is then calendered into a film, the film is cooled and crushed into chips. The carbon black concentrates can be used as pigmentation agents for lacquers, paints and printing inks.
Claims14
A method for producing nitrocellulose-based carbon black concentrates comprising:
- (a) low molecular weight alcohol free nitrocellulose chips
- (b) carbon black
- (c) plasticizer, and
- (d) wetting agent wherein said alcohol free nitrocellulose is mixed thoroughly in the absence of a low molecular weight alcohol with the other constituents (b), (c) and (d) to form a free-flowing mixture, converting said mixture at an elevated temperature into a dispersion, then forming said dispersion into a film, cooling said film down to a temperature that allows it to be crushed, and crushing it into chips.
1 more element
Dependencies are inferred from the claim text.