Polymer, electrophotographic photosensitive member and electroluminescence device using the polymer, process cartridge and electrophotographic apparatus using the electrophotographic photosensitive member

摘要

A polymer characterised by containing the following structural unit (1) wherein each of R1, R2, and R3 is a hydrogen atom, an alkyl group or a halogen atom. R1, R2, and R3 may be the same or different. X is an alkylene group. Ar1 is a phenylene group. Each of Ar2 and Ar3 is an aromatic hydrocarbon ring group or an aromatic heterocyclic group. Ar2 and Ar3 may be the same or different. Each of R1, R2, R3, X, Ar1, Ar2 and Ar3 may have substituents. The above polymer has excellent hole transfer characteristics, layer forming characteristics and high mechanical strength.