| 摘要 |
PROBLEM TO BE SOLVED: To obtain a titanyl phthalocyanine particle, having a specific crystal structure and a specified specific surface area, capable of reducing the temperature dependence of sensitivity with a high sensitivity when used for electrophotography and useful as electrophotographic photoreceptors. SOLUTION: This titanyl phthalocyanine particle has the maximum peak at 27.2 deg. Bragg angle (2θ±0.2 deg.) in X-diffractometry with Cu-Kαradiations and, as necessary, further peaks at 9.6 deg. and 24.1 deg. and the BET specific surface area regulated to <=22m<2> /g. The particle obtained by preparing diiminoindoline from phthalonitrile and ammonia, reacting the resultant diiminoindoline with an alkoxy titanate, etc., at a low temperature, etc., dissolving the prepared crude pigment in sulfuric acid, pouring the solution into water, then carrying out the freezing treatment of the prepared hydrous paste, affording anαtype crystalline powder and treating the resultant powder with an organic solvent in the presence of water.
|
