摘要:
A photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer includes a novel bisazo compound as a charge generating substance therein. The bisazo compound is represented by the following general formula: ##STR1## wherein, A stands for a coupler residue.
摘要:
AN IMPROVEMENT IN THE PROCESS OF COUPLING TETRAZOTIZED AROMATIC DIAMINES WITH AMINOHYDROXYNAPHTHALENES IS PROVIDED BY EMPLOYING AN ACID BINDING AGENT SELECTED FROM BASIC INORGANIC COMPOUNDS OF LITHIUM AND MAGNESIUM.
摘要:
IS PRODUCED BY TETRAZOTIZING 3,3'',5,5''-TETRACHLOROBENZIDINE AND THEN COUPLING THE TETRAZOTIZED PRODUCT WITH ACETO-ACET-OPHENETIDIDE. In a preferred method N,N''-diacetyl-3,3'',5,5''tetrachlorobenzidine is hydrolyzed to the corresponding amine in situ in the acid solution which is to be used for the tetrazotizing step.
A benzidine yellow type pigment of unusually good lightfastness and superior strength is described. The pigment, which is a compound of the formula
摘要:
A photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer includes a novel bisazo compound as a charge generating substance therein. The bisazo compound is represented by the following general formula: ##STR1## wherein, A stands for a coupler residue.
摘要:
A photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer includes a novel bisazo compound as a charge generating substance therein. The one type of the bisazo compound is represented by the following general formula: ##STR1## wherein, A stands for a coupler residue.
摘要:
The present invention provides disazo compounds expressed by the general formula I ##STR1## wherein A represents ##STR2## in which 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. The disazo compounds are useful as photoconductive substances or charge-carrier generating substances in various kinds of electrophotographic elements.
摘要:
Bisazo compounds of formula (I), an intermediate for producing the bisazo compound of formula (I), and trisazo compounds of formula (II) for use in optical information recording media, and methods of producing these compounds are disclosed: ##STR1## wherein R represents hydrogen, an alkyl group having 1 to 20 carbon atoms; an aryl group selected from the group consisting of phenyl group, naphthyl group, mesityl group, and tri-t-butyl phenyl group; an alkoxyl group having 1 to 4 carbon atoms; a nitro group; a cyano group; chlorine; or bromine; n is an integer of 1, 2, or 3, and C.sub.p represents a coupler residue.
摘要:
Compounds having formula (I), which are useful as starting or intermediate materials for preparing organic photoconductive materials, or as organic photoconductive materials: ##STR1## wherein R.sup.1 is a nitro group, an amino group or a diphenylamino group which may have a substituent; and R.sup.2 is hydrogen or an alkyl group having 1 to 6 carbon atoms, and methods of preparing the above compounds are disclosed.