To provide carbon black which improves the electrical conductivity and flowability of a resin composition. Carbon black characterized by having the following characteristics: 24M4DBP absorption: At least 130 cm 3 /100 g (1,500° C.×30 min) dehydrogenation amount: At most 1.2 mg/g Crystallite size Lc: From 10 to 17 Å More preferably, it has the following characteristics: Nitrogen adsorption specific surface area: from 150 to 300 m 2 /g Average particle diameter: from 14 to 24 nm CTAB adsorption specific surface area: from 120 to 220 m 2 /g DBP absorption: from 150 to 400 cm 3 /100 g Oxygen-containing functional group density: at most 3 μmol/m 2 .
1. Carbon black, which has:
(a) a 24M4DBP absorption of at least 131 cm 3 /100 g;
(b) a (1,500° C.×30 min) dehydrogenation amount of at most 1.2 mg/g;
(c) a crystallite size Lc of from 10 to 17 Å;
(d) a nitrogen adsorption specific surface area of from 150 to 300 m 2 /g;
(e) a ratio of the Stokes mode diameter, D mod , in nm, to the 24M4DBP absorption, in cm 3 /100 g, of from 0.6 to 0.9 nm·100 g/cm 3 ; and
(f) an average particle diameter as measured by a transmission electron microscope of from 14 to 24 nm.
2. The carbon black according to claim 1 , which has a CTAB (cetyltrimethylammonium bromide) adsorption specific surface area of from 120 to 220 m 2 /g.
3. The carbon black according to claim 1 , which has a DBP absorption of from 150 to 400 cm 3 /100 g.
4. The carbon black according to claim 1 , which has an oxygen-containing functional group density of at most 3 μmol/m 2 , wherein said oxygen-containing functional group density is defined by the following formula:
Oxygen-containing functional group density (μmol/m 2 )=[(1,500° C.×30 min) CO generation (μmol/g)+(1,500° C.×30 min) CO 2 generation (μmol/g)]/nitrogen adsorption specific surface area (m 2 /g).
5. The carbon black according to claim 1 , which is oil furnace carbon black.
6. The carbon black according to claim 1 , which has a 24M4DBP absorption of at least 130 cm 3 /100 g.
7. The carbon black according to claim 1 , which has a 24M4DBP absorption of at least 140 cm 3 /100 g.
8. The carbon black according to claim 1 , which has a nitrogen adsorption specific surface area of from 200 to 290 m 2 /g.