Tones for development of electrostatic image and production process thereof
AssigneeNippon Zeon Co., Ltd.
InventorsMakoto Watanabe, Katsuhiro Imai
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Abstract
A toner for development of electrostatic images comprising carbon black as a colorant, wherein the carbon black has the following features: (1) the primary particle diameter being within a range of 28 to 60 nm; (2) the DBP oil absorption being within a range of 40 to 75 ml/100 g; and (3) the pH being within a range of 6.0 to 10.0, and a production process of the toner by a suspension polymerization process.
Claims19
A toner for development of electrostatic images, which is obtained by subjecting a polymerizable monomer composition containing at least a polymerizable monomer and carbon black to suspension polymerization and is suitable for use in a non-magnetic one-component development system, wherein the carbon black has the following features:
- (1) the primary particle diameter being within a range of 38 to 60 nm;
- (2) the DBP oil absorption being within a range of 40 to 69 ml 100 g;
- (3) the pH being within a range of 6.0 to 10.0;
- and
- (4) the total content of polycyclic aromatic hydrocarbons being 10 ppm or lower.
A process for producing a toner for development of electrostatic images, which is suitable for use in a non-magnetic one-component development system, by subjecting a polymerizable monomer composition containing at least a polymerizable monomer and carbon black to suspension polymerization, the process comprising using, as the carbon black, that having the following features:
- (1) the primary particle diameter being within a range of 38 to 60 nm;
- (2) the DBP oil absorption being within a range of 40 to 69 ml/100 g;
- (3) the pH being within a range of 6.0 to 10.0;
- and
- (4) the total content of polycyclic aromatic hydrocarbons being 10 ppm or lower.
Dependencies are inferred from the claim text.