Electrophotographic element containing disazo pigment charge generating material
AssigneeRicoh Company, Ltd.
InventorMitsuru Hashimoto
Life of this patent
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Abstract
An electrophotographic element comprising an electrically conductive support and a mono-layer or multi-layer type photosensitive layer, superposed thereon, containing as an active ingredient a disazo pigment having the following general formula: ##STR1## where Ar is a substituted or non-substituted phenyl, substituted or non-substituted naphthyl, anthryl, pyrenyl, pyridyl, thienyl, furyl or carbazolyl group.
Claims12
An electrophotographic element comprising;
- an electrically conductive support and a photosensitive layer superposed thereon, said photosensitive layer consisting essentially of a disazo pigment having the formula ##STR57## wherein Ar is substituted or non-substituted phenyl, substituted or non-substituted naphthyl, anthryl, pyrenyl, pyridyl, thienyl, furyl or carbazolyl, and a resinous binder.
An electrophotographic element comprising an electrically conductive support and a photosensitive layer superposed thereon, said photosensitive layer consisting essentially of a disazo pigment having the formula ##STR59## wherein Ar is substituted or non-substituted phenyl, substituted or non-substituted naphthyl, anthryl, pyrenyl, pyridyl, thienyl, furyl or carbazolyl, a charge transfer material and a resinous binder.
An electrophotographic element comprising, in successive layers, an electrically conductive support;
- a charge generation layer consisting essentially of a disazo pigment having the formula ##STR61## wherein Ar is substituted or non-substituted phenyl, substituted or non-substituted naphthyl, anthryl, pyrenyl, pyridyl, thienyl, furyl or carbazolyl;
- and a charge transfer layer consisting essentially of a charge transfer material and a resinous binder.
An electrophotographic element comprising, in successive layers, an electrically conductive support;
- a charge transfer layer consisting essentially of a charge transfer material and a resinous binder;
- and a charge generation layer consisting essentially of a disazo pigment having the formula ##STR63## wherein Ar is substituted or non-substituted phenyl, substituted or non-substituted naphthyl, anthryl, pyrenyl, pyridyl, thienyl, furyl or carbazolyl.
Dependencies are inferred from the claim text.