TITANYL PHTHALOCYANINE PREPARATIVE PROCESS FOR IMPROVED PHOTOSENSITIVITY
Original Publication Date: 1996-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Disclosed is a titanyl phthalocyanine (TiOPc) preparative process for providing pigments with improved photosensitivity. The TiOPc afforded in accordance with the present process is useful in, for example, fabricating high sensitivity photoreceptor devices. In an exemplary procedure, ground particulate Type IV TiOPc prepared in accordance with, for example, U.S. Patent No. 5,189,156; 5,206,359; and 5322,754; and references therein, that is by dissolution and precipitation fiom trifluoroacetic acid solution, is stirred with about 10 percent by weight of seed particles comprised of TiOPc prepared in accordance with U.S. Patent No. 5,350,844, in methylene chloride at about 40-41°C for 6 to 8 hours at atmospheric pressure. The resulting mixture is cooled to 25°C and filtered. The filtered material is slurry washed with methylene chloride and dried.