Electrophotographic material containing sensitizers

Abstract

An electrophotographic material is provided herein which comprises a conductive support layer and a photoconductive insulating layer, the latter layer comprising a photoconductive polymeric compound such as poly-N-vinylcarbazole, and a sensitizer having the following general formula ##SPC1## Wherein B represents a radical selected from the group consisting of ##SPC2## ##SPC3## Compounds falling under the latter general formula include such compounds as 2-phenyl-4-[(2'-phenyl-4'-benzopyranylidene) benzyl]-benzopyrylium perchlorate and 2,3-phenyl-4-[(2'-phenyl 4'-benzopyranylidene)benzyl]-6-methylbenzopyrylium perchlorate.

What we claim is: 
     
       1. An electrophotographic material comprising a conductive support layer and photoconductive insulating layer, the latter comprising a combination of a photoconductive polymeric compound and a sensitizing amount of a sensitizer having the following formula: ##SPC17## wherein   
     
     
       B represents a radical selected from the group consisting of ##SPC18## ##SPC19## 
     
     
       R 1  is hydrogen, phenyl or an ethenyl radical selected from the group consisting of styryl, p-methoxystyryl, 3,4-dimethoxy-styryl, α-phenylstyryl, α-phenyl-p-methoxystyryl, β-furyl(α')ethenyl and α-phenyl-β-furyl(α') ethenyl; 
     
     
       R 2  is hydrogen or phenyl; 
     
     
       R 3  is hydrogen, methyl or phenyl; 
     
     
       R 4  is hydrogen or phenyl; 
     
     
       R 5  is hydrogen, phenyl or an ethenyl radical selected from the group consisting of styryl, p-methoxystyryl, 3,4-dimethoxy-styryl, α-phenyl-p-methoxystyryl, β-furyl(α')ethenyl and α-phenyl-β-furyl(α')ethenyl; 
     
     
       R 6  is hydrogen or phenyl; 
     
     
       R 7  is hydrogen or phenyl; .Iadd. 
     
     
       R 8  is hydrogen or phenyl; 
     
     
       R 9  is hydrogen or p-methoxyphenyl; .Iaddend. 
     
     
       the anion is an anionic function selected from the group consisting of perchlorate, fluoroborate, chloroferrate, chlorozincate and nitrate; and 
     
     
       X is oxygen or a sulfur atom; 
     
     
       said photoconductive polymeric compound comprising at least one compound selected from the group consisting of poly-N-vinylcarbazole, brominated 
     
     
       2. An electrophotographic material according to claim 1, wherein said sensitizer comprises at least one compound selected from the group consisting of 2-(α-phenyl-p-methoxystyryl)-4-[(2'-phenyl-4'-benzopyranylidene)methyl]benzopyrylium perchlorate, 2-p-methoxystyryl-4-[(2'-3",4"-dimethoxystyryl-3'-phenyl-6'-methyl-4'-benzopyranylidene)methyl]benzopyrylium perchlorate, 2-[(2'-phenyl-4'-benzopyranylidene) methyl]-3-phenyl benzopyrylium fluoroborate, 2-[(2'-phenyl-4'-benzopyranylidene)methyl]-4-p-methoxyphenyl benzothiopyrylium perchlorate, and 2-[(2'-phenyl-4'-benzothiopyryanylidene)methyl]-4-p-methoxyphenyl 
     
     
       3. An electrophotographic material according to claim 1, wherein said combination comprises 100 weight parts of photoconductive polymeric compound and 0.01 to 3.0 weight parts of sensitizer.