Electrophotographic element containing a disazo pigment
AssigneeRicoh Company, Ltd.
InventorsMasafumi Ohta, Kiyoshi Sakai, Mitsuru Hashimoto, Masaomi Sasaki, Tomiko Kawakami
Life of this patent
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Abstract
The present invention provides an electrophotographic element which comprises some disazo pigment expressed by the general formula ##STR1## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical; A represents ##STR2## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR3## and n is an interger of 1 or 2.] as effective component contained in the photosensitive layer thereof.
Claims114
A photosensitive element for use in electrophotography which comprises an electroconductive support and a photosensitive layer, formed thereon, consisting essentially of a disazo pigment expressed by the general formula ##STR13## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical;
- A represents ##STR14## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR15## and n is an integer of 1 or 2] and a resin binder.
A photosensitive element for use in electrophotography which comprises an electroconductive support and a photosensitive layer, formed thereon, consisting essentially of a disazo pigment expressed by the general formula ##STR38## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical;
- A represents ##STR39## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR40## and n is an integer of 1 or 2], a charge transfer substance and a resin binder.
A photosensitive element for use in electrophotography which comprises an electroconductive support on which there is a charge-carrier generating layer consisting essentially of a disazo pigment expressed by the general formula ##STR83## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical;
- A represents ##STR84## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR85## and n is an integer of 1 or 2] and a charge transfer layer consisting essentially of a charge-transfer substance and a resin binder.
Dependencies are inferred from the claim text.