Abstract: To provide a propylene resin composition excellent in both the electroconductivity and moldability and excellent in their balance, and a molded product thereof. A propylene resin composition comprising from 50 to 98 wt % of a propylene resin having a MFR of from 5 to 300 g/10 min, and from 2 to 50 wt % of carbon black having a 24M4DBP absorption of at least 130 cm3/100 g, a dehydrogenation amount of at most 1.2 mg/g at 1,500° C. for 30 minutes and a crystallite size (Lc) of from 10 to 17 ?. A propylene resin molded product which is a propylene resin molded product obtained by molding such a propylene resin composition and which has a volume resistivity of from 102 to 109 ?·cm and a MFR of from 1 to 80 g/10 min.

Abstract: 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 cm3/100 g (1,500° C.×30 min) dehydrogenation amount: At most 1.2 mg/g Crystallite size Lc: From 10 to 17 ? More preferably, it has the following characteristics: Nitrogen adsorption specific surface area: from 150 to 300 m2/g Average particle diameter: from 14 to 24 nm CTAB adsorption specific surface area: from 120 to 220 m2/g DBP absorption: from 150 to 400 cm3/100 g Oxygen-containing functional group density: at most 3 ?mol/m2.

Abstract: To provide a propylene resin composition excellent in both the electroconductivity and moldability and excellent in their balance, and a molded product thereof. A propylene resin composition comprising from 50 to 98 wt % of a propylene resin having a MFR of from 5 to 300 g/10 min, and from 2 to 50 wt % of carbon black having a 24M4DBP absorption of at least 130 cm3/100 g, a dehydrogenation amount of at most 1.2 mg/g at 1,500° C. for 30 minutes and a crystallite size (Lc) of from 10 to 17 ?. A propylene resin molded product which is a propylene resin molded product obtained by molding such a propylene resin composition and which has a volume resistivity of from 102 to 109 ?·cm and a MFR of from 1 to 80 g/10 min.

Abstract: 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 cm3/100 g (1,500° C. ×30 min) dehydrogenation amount: At most 1.

Abstract: A carbon black having an average particle size of at most 13 nm, Dmod of at most 80 nm, a D½/Dmod ratio of at most 0.6 and at least pH 5.

Abstract: A method for producing oxidation-treated carbon black, which comprises oxidizing carbon black by ozone in the presence of water until the total amount of acid groups of the carbon black becomes at least 3 .mu.equ/m.sup.2.

Abstract: A carbon black having a D1/2/Dmod ratio of at most 0.53.

Abstract: Easily dispersible coloring carbon black obtained by compacting carbon black powder material to have a bulk density of from 0.10 to 0.50 g/cm.sup.3 and having an initial dispersion of at most 5.0%.

Abstract: A recording liquid containing carbon black dispersed in an aqueous medium, wherein the volume ratio of carbon black having a particle size of at least 0.2 .mu.m to the total carbon black is at least 50% by volume, and the volume ratio of carbon black having a particle size of at least 0.6 .mu.m to the total carbon black is at most 20% by volume.