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AssigneeRicoh Company, Ltd.
InventorsMasaomi Sasaki, Kiyoshi Sakai, Mitsuru Hashimoto, Masafumi Ohta, Kyoji Tsutsui
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The present invention provides an electrophotographic element of a high sensitivity and a high flexibility comprising an electroconductive support and a photosensitive layer provided thereon and containing as an effective ingredient therein a disazo compound represented by the following general formula: ##STR1## wherein A is a radical selected from the group consisting of: ##STR2## in which X represents a ring selected from the group consisting of aromatic rings such as benzene ring and naphthalene ring, hetero rings such as indole ring, carbazole ring and benzofuran ring, and substituted derivatives thereof; Ar.sub.1 represents a radical selected from the group consisting of aromatic rings such as benzene ring and naphthalene ring, hetero rings such as dibenzofuran ring and substituted derivatives thereof; Ar.sub.2 and Ar.sub.3 represent radicals respectively selected from the group consisting of aromatic rings such as benzene ring and naphthalene ring, and substituted derivatives thereof; R.sub.1 and R.sub.3 represent radicals respectively selected from the group consisting of hydrogen atom, lower alkyl radicals and phenyl radical and substituted derivatives thereof; and R.sub.2 represents a radical selected from the group consisting of lower alkyl radicals, and carboxyl radical and esters thereof.
An electrophotographic material having a high sensitivity as well as a high flexibility, which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of disazo pigment having the formula ##STR8## wherein A is selected from the group consisting of ##STR9## 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 disazo pigment having the formula ##STR12## wherein A is selected from the group consisting of ##STR13## 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 charge carrier-generating layer formed thereon, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment having the formula ##STR16## wherein A is selected from the group consisting of ##STR17## 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, a charge-transfer layer on said support, said charge-transfer layer consisting essentially of a charge-transfer substance and a resinous binder, and a charge carrier-generating layer on said charge-transfer layer, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment having the formula ##STR20## wherein A is selected from the group consisting of ##STR21## 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.