Carbon black having organic groups, the organic group containing a thiocyanate group. Also described is a process for the production of the carbon black, wherein carbon black is reacted with organic compounds containing a C—C double or triple bond, which is not part of an aromatic system, whose C—C double or triple bond is activated by at least one substituent, and the organic compound contains at least one thiocyanate group. The carbon black according to the invention can be used in rubber compounds.
1. A carbon black having attached thereto at least one organic group selected from the group consisting of an N-(4-thiocyanate alkyl)succinimide, N-(4-thiocyanate aryl)succinimide, N-(4-thiocyanate alkyl)amide and N-(4-thiocyanate aryl)amide group.
2. The carbon blank having at least one organic group according to claim 1 , characterized in that the organic group an N-(4-thiocyanatophenyl) succinimide or N-(4-thiocyanatophenyl)amide.
3. A process for the production of a carbon black according to claim 1 , comprising reacting carbon black with an organic compound containing an organic group which is a member selected from the group consisting of an N-(4-thiocyanate alkyl)succinimide, N-(4-thiocyanate aryl)succinimide, N-(4-thiocyanate alkyl)amide and N-(4-thiocyanate aryl)amide group.
4. The process for the production of a carbon black according to claim 1 , comprising reacting a carbon black with a diazonium salt, wherein the diazonium salt contains a thiocyanate group.
5. A vulcanizable rubber compound, comprising at least one rubber or a blend of rubbers and a carbon black having organic groups according to claim 1 .
6. The vulcanizable rubber compound according to claim 5 , wherein the carbon black having organic groups is used in a quantity of 10 to 150 parts by weight, the parts by weight relating to 100 parts by weight of rubber.
7. Process for the production of a vulcanizable rubber compound according to claim 5 , wherein the rubber or the blend of rubbers and the carbon black with organic groups are mixed in a mixer.
8. A moulded article obtained from a rubber compound according to claim 5 by vulcanization.
9. A rubber compound according to claim 5 , characterized in that its dynamic rigidity and loss factor tan δ at 60° C. are improved in comparison to a rubber compound containing unmodified starting carbon black.
10. A vulcanized rubber compound, comprising at least one rubber or a blend of rubbers and a carbon black having organic groups according to claim 1 .
11. The vulcanized rubber compound according to claim 10 , wherein the carbon black having organic groups is used in a quantity of 10 to 150 parts by weight, the parts by weight relating to 100 parts by weight of rubber.
12. Process for the production of a vulcanized rubber compound according to claim 10 , wherein the rubber or the blend of rubbers and the carbon black with organic groups are mixed in a mixer.
13. A rubber compound according to claim 10 in the forms of a pneumatic tire, tire tread, cable sheath, tube, drive belt, conveyor belt, roll covering, tire, shoe sole, sealing ring, profile or damping element.