PIGMENT COMPOSITION FOR LIQUID TONER, METHOD OF MANUFACTURING THE SAME AND LIQUID TONER MANUFACTURING METHOD

摘要

In a pigment composition for liquid toner comprising a carbon black, a resin and non-aqueous solvent, the carbon black and the resin being dissolved and dispersed in the non-aqueous solvent, and any one of (1) carbon black having a grit content of not more than 10 ppm and an ash content of not more than 0.1 % by weight, (2) such carbon black that a value obtained by dividing a total amount of oxygen calculated from a composition of volatile components in carbon black at 1,500 DEG C by a specific surface area thereof, lies in the range of 0.20 to 0.40 mg/m<2>, and (3) such carbon black that when extracted with monochlorobenzene, the content of polynuclear aromatic hydrocarbons in the extract is not more than 30 ppm, being used as the carbon black. The above-mentioned pigment composition is produced by kneading the pigment and the resin together, freeze-pulverizing the mixture and then dissolving and dispersing the resultant particles in the non-aqueous solvent. When such a pigment composition is used, there can be obtained not only a pigment composition for liquid toner which is capable of exhibiting a good image properties, especially image properties with a sufficient print density, but also a pigment composition for liquid toner which has no influence on human body even when inhaled or sucked, and is excellent in image properties.