Peter Dilling - Isle of Palms SC
Gerald Prazak - Charleston SC
Catherine C. Cashman - Hanahan SC
Westvaco Corporation - New York NY
A carbon black composition comprising carbon black and a lignin dispersant prepared by the steps of methylolating a lignin compound by reaction of less than about 2 moles formaldehyde per 1,000 grams of the lignin, and sulfonating the methylolated lignin by reaction from about 2. 5 to 3. 5 moles of the sulfite or bisulfite compound per 1,000 grams of lignin at an initial reaction pH of below about 6. 6 and at a temperature of at least about 170. degree. C. , while allowing the pH of the reaction mixture to rise to a final pH of greater than 7. 5 to sequentially sulfomethylate the aromatic nucleus and sulfonate the side chain of the lignin.