Patent ID: 7544238

Claim:
A carbon black product having attached a) at least one steric group having the formula —X—Sp—[(CH 2 ) m —O—)] p R or —X—Sp—[A] p R, wherein X is attached to the pigment and is an arylene group or alkylene group; Sp represents a spacer group and is a bond or a chemical group selected from the group consisting of: CO 2 , O 2 C, SO 2 , CO, NHCO, CONR″, NR″CO 2 , OCNR″, NR″CONR″, O, S, NR″, SO 2 C 2 H 4 , arylene, alkylene, NR″CO, NHCO 2 , O 2 CNH, and NCHONH, wherein R″, which can be the same or different, represents an aryl or alkyl group; m is an integer of from 1 to 12; p is an integer from 1 to 500; A represents an alkylene oxide group of from about 1 to about 12 carbons, wherein A can be the same or different when p is greater than 1; and R is hydrogen, a branched or unbranched C1-C12 alkyl group, or an aromatic group; and b) at least one aromatic or C1-C12 alkyl group further substituted with at least one —COO − , —SO 3 − , —HPO 3 − , or —PO 3 −2 group with at least one amphiphilic counterion.