Patent ID: 7294185

Claim:
A carbon black product having an organic group attached to the carbon black, obtained by a process comprising the step of reacting at least one diazonium salt with a carbon black in a protic reaction medium, wherein said diazonium salt is generated in situ from a primary amine, the protic medium is an aqueous medium, and the primary amine is an amine of the formula A y ArNH 2 , in which: Ar is an aromatic or heteroaromatic radical; y is an integer from 1 to the total number of —CH radicals present in the aromatic radical; and A, which can be the same or different when y is greater than 1, is independently a substituent on the aromatic radical selected from: a functional group selected from the group consisting of a branched or unbranched C 1 -C 20 substituted alkyl, branched or unbranched C 3 -C 20 unsubstituted alkyl, unsubstituted or substituted alkenyl, unsubstituted or substituted alkynyl, unsubstituted or substituted heteroaryl, unsubstituted or substituted alkylaryl, and unsubstituted or substituted arylalkyl; a functional group selected from the group consisting of OR, COR, COOR, OCOR, a carboxylate salt, CN, NR 2 , SO 3 H, a sulfonate salt, OSO 3 H, OSO 3 − salts, NR(COR), CONR 2 , NO 2 , OPO 3 H 2 , a monobasic or dibasic phosphate salt, PO 3 H 2 , a monobasic or dibasic phosphonate salt, N═NR, N 2 + X − , NR 3 + X − , PR 3 + X − , S k R, SO 2 NRR′, SO 2 SR, SNRR′, SSO 3 H, a SSO 3 − salt, SNQ, SO 2 NQ, CO 2 NQ, S-(1,4-piperazinediyl)-SR, 2-(1,3-dithianyl), 2-(1,3-dithiolanyl), SOR, and SO 2 R; and a linear, branched, aromatic, or cyclic hydrocarbon radical, substituted with one or more of said functional groups and/or halogen(s); wherein R and R′, which can be the same or different, are hydrogen; branched or unbranched C 1 -C 20 unsubstituted or substituted alkyl, alkenyl, or alkynyl; unsubstituted or substituted aryl; unsubstituted or substituted heteroaryl; unsubstituted or substituted alkylaryl; or unsubstituted or substituted arylalkyl; k is an integer from 1 to 8; X − is a halide or an anion derived from a mineral or organic acid; and Q is (CH 2 ) w , (CH 2 ) x O(CH 2 ) z , (CH 2 ) x NR(CH 2 ) z or (CH 2 ) x S(CH 2 ) z , wherein x is 1 to 6, z is 1 to 6, and w is 2 to 6; and wherein Ar is optionally further substituted with alkyl(s) and/or halogen(s).