It is intended to provide a carbon black which can confer reinforcing properties and low exothermicity, which are usually incompatible, as well as excellent abrasion resistance, when mixed with a rubber component, and is suitable for tire tread rubber that is used particularly under severe driving conditions. The present invention provides a carbon black having surface free energy γ.sup.d of 50 to 200 mJ/m.sup.2 determined by a reverse-phase gas chromatography analysis method and a strongly acidic group concentration of 0 to 0.115 μmol/m.sup.2.

A carbon black is disclosed which can exert excellent abrasion resistance while suppressing heat generation when incorporated into a rubber composition. A carbon black in which the total number of active sites represented by a product of a full width at half maximum of a Raman scattering peak appearing in a range of 1340 to 1360 cm.sup.−1 when an excitation wavelength is 532 nm and a specific surface area when nitrogen gas is adsorbed is 3.60×10.sup.4 to 8.20×10.sup.4 (cm.sup.−1.Math.m.sup.2/g), and when a nuclear magnetic resonance signal of a spin-spin relaxation process observed by a solid echo method is represented by a sum of a first signal and a second signal having a time constant larger than that of the first signal, an amount of hydrogen represented by a signal intensity per unit mass at time 0 of the first signal is 50.0 to 250.0 (/g).

A carbon black is disclosed which can exert excellent abrasion resistance while suppressing heat generation when incorporated into a rubber composition. A carbon black in which the total number of active sites represented by a product of a full width at half maximum of a Raman scattering peak appearing in a range of 1340 to 1360 cm.sup.−1 when an excitation wavelength is 532 nm and a specific surface area when nitrogen gas is adsorbed is 3.60×10.sup.4 to 8.20×10.sup.4 (cm.sup.−1.Math.m.sup.2/g), and when a nuclear magnetic resonance signal of a spin-spin relaxation process observed by a solid echo method is represented by a sum of a first signal and a second signal having a time constant larger than that of the first signal, an amount of hydrogen represented by a signal intensity per unit mass at time 0 of the first signal is 50.0 to 250.0 (/g).

Systems and methods are provided for converting plastic waste into carbon pigment. Received polymer material such as plastic waste is degraded at 350-600° C. to form carbon-rich liquid and non-condensable syngas, and the carbon-rich liquid is then pyrolyzed at 1100-2200° C. to form carbon nanoparticles that may be used as carbon pigment. The syngas and possibly some of the form carbon-rich liquid may be used to provide heat to the system.

The present invention generally relates to a method for preparing a carbon black of high resistivity through the surface treatment of the carbon black which exhibits conductivity, and a carbon black prepared by this method.

The present invention generally relates to a method for preparing a carbon black of high resistivity through the surface treatment of the carbon black which exhibits conductivity, and a carbon black prepared by this method.

Particles with suitable properties may be generated using systems and methods provided herein. The particles may include carbon particles.

Particles with suitable properties may be generated using systems and methods provided herein. The particles may include carbon particles.

A process for making carbon black is described by pyrolizing unsulfonated lignin or by pyrolizing aromatic monomers formed by hydrolyzing a biomass comprising unsulfonated lignin.

A process for making carbon black is described by pyrolizing unsulfonated lignin or by pyrolizing aromatic monomers formed by hydrolyzing a biomass comprising unsulfonated lignin.