Patent ID: 6087434
Filing Date: 2000-07-11
Classification: G03G

Abstract:
A pigment composition for a liquid toner, containing a carbon black in an amount of 50 to 0.1% by weight and a resin in an amount of 50% to 99.9% by weight, the carbon black and the resin dissolved and dispersed in a non-aqueous solvent and the solids content of the composition being at least 5% by weight,wherein the carbon black has a particle diameter in the range of 10 to 100 nm, a dibutyl phthalate (DBP) absorption of 40 to 300 ml/100 g, a specific surface area (BET) of 20 to 1000 m.sup.2 /g, a pH of 2.0 to 10.0, a grit content not more than 10 ppm, an ash content not more than 0.1% by weight, a polynuclear aromatic hydrocarbons (PAH) content of not more than 30 ppm, and having a total amount of oxygen per unit area of 0.20 to 0.40 mg/m.sup.2 calculated by dividing a total amount of oxygen obtained from composition of volatile components generated therefrom at 1,500.degree. C. by a specific surface area thereof.