| TOKAI CARBON CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20100269732 | AQUEOUS DISPERSION OF SURFACE-TREATED CARBON BLACK AND METHOD OF PRODUCING THE SAME - A carbon black aqueous dispersion that is suitable as an aqueous black ink for inkjet printers, and a method of producing the same are disclosed. A surface-treated carbon black aqueous dispersion includes an aqueous medium and surface-treated carbon black that is dispersed in the aqueous medium, the surface-treated carbon black having been chemically modified by causing a hydrophilic surface functional group of the carbon black and an amino group-containing compound to undergo a dehydration-condensation reaction in the presence of a triazine condensing agent to form an amide bond. A method of producing a surface-treated carbon black aqueous dispersion includes oxidizing carbon black to produce a hydrophilic surface functional group, dispersing the carbon black in an aqueous medium to obtain an aqueous medium dispersion, adding an amino group-containing compound and a triazine condensing agent to the aqueous medium dispersion, causing the hydrophilic surface functional group of the carbon black and the amino group-containing compound to undergo a dehydration-condensation reaction by stirring the aqueous medium dispersion at room temperature, and removing large particles, unreacted amino group-containing compound, a decomposition product of the triazine condensing agent, and unreacted triazine condensing agent, followed by neutralization, purification, and concentration. | 10-28-2010 |
| 20090214954 | NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS SECONDARY CELLS, NEGATIVE ELECTRODE FOR NONAQUEOUS SECONDARY CELLS, AND NONAQUEOUS SECONDARY CELL - A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle, exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances, and having no electrodeposition problem is provided. The main component of the material is graphite particles. The median diameter of the graphite particles is 5 μm or more, and 40 μm or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density of the negative electrode material is 0.7 g/cm | 08-27-2009 |
| 20090130561 | NON-AQUEOUS SECONDARY BATTERY-USE GRAPHITE COMPOSITE PARTICLE, CATHODE ACTIVE SUBSTANCE MATERIAL CONTAINING IT, CATHODE AND NON-AQUEOUS SECONDARY BATTERY - To provide a nonaqueous secondary battery ensuring that a charge-discharge irreversible capacity at an initial cycle is sufficiently small even when an active material layer comprising a negative electrode active material on a current collector is increased in a density for obtaining a high capacity. | 05-21-2009 |
| 20090114119 | Carbon Black Aqueous Dispersion and Method of Producing the Same - A carbon black aqueous dispersion exhibits excellent dispersibility in an aqueous medium and exhibits excellent rubbing resistance (quick-drying properties), discharge stability, and the like as an aqueous black ink for an inkjet printer or the like. The carbon black aqueous dispersion includes an aqueous medium and carbon black dispersed in the aqueous medium, acidic groups produced on the surface of the carbon black by liquid-phase oxidation being neutralized with a basic amino acid and a basic compound other than the basic amino acid, and hydrogen atoms of the acidic groups being replaced by the basic amino acid and the basic compound. The method of producing the carbon black aqueous dispersion includes subjecting carbon black to liquid-phase oxidation, removing reduced salts from the resulting slurry, neutralizing the carbon black with a basic amino acid and a basic compound other than the basic amino acid to replace hydrogen atoms of acidic groups by the basic amino acid and the basic compound, and purifying the resulting product. | 05-07-2009 |
| 20080199777 | Negative Electrode Material For Nonaqueous Secondary Cells, Negative Electrode For Nonaqueous Secondary Cells, and Nonaqueous Secondary Cell - A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle and exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances is provided. The main component of the material is graphite particles. The median diameter is 5 μm or more, and 40 μm or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density is 0.7 g/cm | 08-21-2008 |
