Photoconductive insulating films comprising fluorenone-substituted oligomers

摘要

Composite photoconductive insulating films comprising a thin layer of photoconductive materials having substantial spectral response in the visible region of the electromagnetic spectrum and a substantially colorless insulating layer contiguous therewith comprising a minor portion of electronically inert binder in a major portion of an electronically active oligomer of the formula: <IMAGE> wherein R is <IMAGE> +tr <IMAGE> R' is hydrogen or methyl; R'' is alkyl of 1-10 carbon atoms; X and Y are independently selected from the group consisting of NO2, halogen, cyano and -CF3; Z is oxygen or dicyanomethylene; A AND A' CAN RANGE FROM 0-3; M IS 1-10; AND N IS IN THE RANGE OF FROM ABOUT 3 TO ABOUT 25.