ELECTRON-TRANSPORTING POLYMERS HAVING SIDE-CHAIN FLUORENE DERIVATIVESFOR USE AS N-TYPE ORGANIC PHOTORECEPTORS

Polymers having a fluorene derivative, a homopolymer of nylbenzyl-9-di cyanomethylenefluorene-4-carboxylate and its copolymer with butyl acry late or butyl methacrylate, were prepared as charge transport material s for electrophotography, and their electrical properties were measure d. A monomer was prepared from 9-dicyanomethylenefluorene-4-carboxylic acid and 4-chloromethylstyrene. Polymerization was carried out using a radical initiator in a nitrogen atmosphere. These polymers were solu ble in organic solvents such as THF, methylene chloride, chloroform, a nd DMF. All of the polymers showed two reversible redox potentials aro und -0.59 to -0.61 and -1.15 to -1.17 V versus Ag/AgCl electrode. The copolymers had high light sensitivities with a half-decay exposure of about 0.4 lux-s and a high electron drift mobility of 3.46 x 10(-6) cm (2)/Vs at the electric field of 4.27 x 10(5) V/cm.