SPECTRAL SENSITIZATION OF PHOTOCONDUCTIVE COMPOSITIONS

1285452 Photoconductive composition AGFA. GEVAERT 30 Dec 1969 [20 Jan 1969] 3157/69 Heading HlK A photoconductive composition comprises a photoconductor and a dye of formula wherein A 1 and A 2 are arylene, R 1 , R 2 , R3 and R 4 are alkyl, cycloalkyl, aralkyl or aryl or R i +Bg and/or R 3 +R 4 close a heterocyclic ring, R and R1 are H, alkyl, cycloalkyl, aralkyl or aryl, p is 0, 1 or 2 and X- is an anion. In the specific embodiments A 1 and A 2 are phenylene, R 1 , R 2 , R 3 and R 4 are methyl, R and R1 are H, phenyl or dimethylamino phenyl and X- is C10 4 -. The dyes are added to a dispersion of ZnO in copoly maleic anhydride/N-vinylpyrrolidone, polyvinyl acetate/crotonic acid and melamine formaldehyde resin in aqueous ammonia and the dispersion coated on baryta paper.