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AssigneeRicoh Company, Ltd.
InventorsMasaomi Sasaki, Kiyoshi Sakai, Mitsuru Hashimoto, Masafumi Ohta, Akio Kozima
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The present invention provides disazo compounds expressed by the general formula I ##STR1## [wherein A represents ##STR2## (wherein R represents alkyl radical, alkoxy radical, nitro radical, dialkylamino radical or halogen, n is 0 or an integer of 1, 2 or 3, and R may be either identical or different when n is an integer of 2 or 3)]; a process for the preparation of said compounds; and electrophotographic sensitive materials having a high sensitivity as well as a high flexibility which comprise a conductive support and a photosensitive layer formed thereon, said photosensitive layer containing a disazo compound, as an effective ingredient, which is expressed by the general formula II ##STR3## [wherein A' represents ##STR4## (wherein X represents aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as indole ring, carbazole ring, benzofuran ring, etc. or their substituents, Ar.sub.1 represents aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as dibenzofuran, etc. or their substituents, Ar.sub.2 and Ar.sub.3 represent aromatic rings such as benzene ring, naphthalene ring, etc. or their substituents, R.sub.1 and R.sub.3 represent respectively hydrogen, lower alkyl radical, phenyl radical or their substituents, and R.sub.2 represents lower alkyl radical, carboxyl radical or their esters)].
An electrophotographic material which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of a disazo compound having the formula ##STR48## wherein A' is a member selected from the group consisting of ##STR49## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring;
An electrophotographic material which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of a disazo compound having the formula ##STR66## wherein A' is a member selected from the group consisting of ##STR67## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring;
An electrophotographic material which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of a disazo compound having the formula ##STR84## wherein A' is a member selected from the group consisting of ##STR85## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring;
Dependencies are inferred from the claim text.