Naphthol derivative and charge control agent comprising the same
The present invention provides a novel naphthol derivative represented by the following general formula (I). The novel naphthol derivative of the present invention is useful as a positively electrifiable charge control agent. The present invention further provides an electrophotographic toner comprising a charge control agent comprising the novel naphthol derivative represented by formula (I).
1. A naphthol derivative represented by the following general formula (I):
wherein
R 1 is an optionally branched, optionally substituted C9 to C20 aliphatic hydrocarbon group which may have an unsaturated bond, and
R 2 is a methyl or acetyl group.
2. The naphthol derivative according to claim 1 , wherein R 1 is an optionally branched, optionally substituted C12 to C18 aliphatic hydrocarbon group.
3. The naphthol derivative according to claim 1 , wherein the derivative is positively chargeable and the amount of the charge is no less than +2.0 μC/g.
4. The naphthol derivative according to claim 2 , wherein the derivative is positively chargeable and the amount of the charge is no less than +2.0 μC/g.
5. A charge control agent comprising a naphthol derivative represented by formula (I):
wherein
R 1 is an optionally branched, optionally substituted C9 to C20 aliphatic hydrocarbon group which may have an unsaturated bond, and
R 2 is a methyl or acetyl group.
6. The charge control agent according to claim 5 , wherein R 1 is an optionally branched, optionally substituted C12 to C18 aliphatic hydrocarbon group.
7. The charge control agent according to claim 5 , wherein the derivative is positively chargeable and the amount of the charge is no less than +2.0 μC/g.
8. The charge control agent according to claim 6 , wherein the derivative is positively chargeable and the amount of the charge is no less than +2.0 μC/g.