Carbon material granulated product, method for producing carbon material granulated product, and conductive resin composition

A method for producing a carbon material granulated product, comprising:

• dry grinding and mixing a granular carbon black and a granular carbon nanotube so that the carbon black has a particle size D50, as determined by a laser diffraction/scattering method specified in ISO 13320, of 10 μm or more and 250 μm or less and the carbon nanotube has a particle size D50, as determined by the laser diffraction/scattering method specified in ISO 13320, of 10 μm or more and 50 μm or less to obtain a mixture;
• preparing a binder solution by dissolving a solvent-soluble polymer in a solvent;
• and
• performing mixing and granulation while adding the binder solution to the mixture to obtain a carbon material granulated product;
• wherein
• the dry grinding for the granular carbon black is performed using at least one selected from the group consisting of an impeller mill, a pin mill, and a roller mill,
• the solvent-soluble polymer is at least one selected from the group consisting of ether polymers, vinyl polymers, amine polymers, cellulose polymers, and starch polymers, and
• a content of the solvent-soluble polymer impregnated into the carbon black and the carbon nanotube is in a range from 1 part by mass to 15 parts by mass relative to a total content of the carbon black and the carbon nanotube taken as 100 parts by mass.