Carbon blacks modified with organosilicon compounds, method of their production and their use in rubber mixtures

Claim 1

Carbon blacks which are chemically modified with at least one organosilicon compound selected from the group consisting of [R.sup.1.sub.n (RO).sub.3-n Si-(Alk).sub.m -(Ar).sub.p ]q [B](I) R.sup.1.sub.n (RO).sub.3-n Si-(Alkyl) (II) R.sup.1.sub.n (RO).sub.3-n Si-(Alkenyl) (III) in which B represents --SCN, --SH, --Cl, --NH 2 (if q=1) or --Sx--(if q=2), R and R 1 , which may be the same or different, represent an alkyl group containing 1 to 4 carbon atoms or the phenyl group, q represents 1 or 2, n represents 0, 1 or 2, Alk represents a bivalent straight or branched hydrocarbon group containing 1 to 6 carbon atoms, m represents 0 or 1, Ar represents an arylene group containing 6 to 12 carbon atoms, p represents 0 or 1 provided that p and n do not simultaneously signify 0, x represents a number from 2 to 8, Alkyl represents a monovalent straight or branched unsaturated hydrocarbon group containing 1 to 20 carbon atoms, alkenyl represents a monovalent straight or branched unsaturated hydrocarbon group containing 2 to 20 carbon atoms, and on the surface of which blacks 0.1 to 15 % by weight of one or more of the named organosilicon compounds are bonded in such a manner that they can not be extracted with organic solvents.