1,1,4,4-TETRAPHENYL-1-3-BUTADIENE DERIVATIVES AND

摘要

Novel l,l,4,4-tetraphenyl-l,3 derivatives are of the formula: CHEM where R1 and R2 each can be a dialkylamino group where the alkyl groups are l-4 C, preferably ethyl, and R2 can be hydrogen. Nine such compounds are shown. Synthesis is by condensation from 3,3-diphenyl acrolein derivative and a dialkyl l,l-diphenylmethylphosphonate. The compounds are used as charge transporting substances in electrophotographic material comprising an electrically conductive support (l) bearing a charge generating layer (3) not exceeding 5 mu m thick and containing a generating substance (2) e.g. an azo dye, and a charge transporting layer (4) 3-50 mu m thick and comprising a binder and l0-90 wt% of a derivative (I) which is coated from a solution, e.g. in dichloroethane. The material is electrophotographically charged, exposed imagewise and developed to provide a clear copy. The material has high sensitivity and good electrophotographic properties.