Electrophotographic copying process and reproduction element
AssigneeOce-van der Grinten N.V.
InventorAdrianus M. P. Hectors
Life of this patent
Estimating the term…
Abstract
In electrophotographic copying processes use is made of a reproduction element comprising on a conductive support a photoconductive layer containing dispersed in a binder a bisazo naphthol compound having a certain structure of substituents whereby the reproduction element exhibits relatively high light-sensitivity and is repeatedly exposable and developable imagewise so as to be useful for indirect electrophotographic copying. Special binder compositions enhance the light-sensitivity of the element and special layer constructions are provided to suit it for certain uses.
Claims24
Electrophotographic copying process in which a latent image is formed on an electrophotographic reproduction element comprising a conductive support and a photoconductive layer by charging and imagewise exposing said layer, the photoconductive layer containing a bisazo naphthol compound, characterized in that said reproduction element contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR2## wherein R represents hydrogen or one or more OCH.sub.3 or OC.sub.2 H.sub.5 groups or one or more chlorine or bromine atoms;
- X is hydrogen, chlorine or bromine;
- R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cycloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer containing a bisazo naphthol compound, characterized in that said layer contains in dispersion in a binder a bisazo naphthol compound having the general formula ##STR3## wherein R represents hydrogen or one or more OCH.sub.3 or OC.sub.2 H.sub.5 groups or one or more chlorine or bromine atoms;
- X is hydrogen, chlorine or bromine;
- R' is hydrogen or a substituted or non-substituted aryl, heterocyclic aryl, aralkyl or lower alkyl group, and R" is hydrogen or a substituted or non-substituted lower alkyl or cyloalkyl group, or R' and R" together with the nitrogen atom to which they attach constitute a saturated or non-saturated 5- or 6- membered ring.
Electrophotographic reproduction element comprising a conductive support having thereon a photoconductive layer comprising, in dispersion in a binder consisting essentially of poly-N-vinylcarbazole containing as an electron acceptor 2, 4, 7-trinitrofluoren-9on or a condensation product of the same with aniline, a particulate bisazo naphthol compound of the formula ##STR4## in which R is hydrogen or a 3-chlorine atom and R.sup.1 is a lower alkyl or a phenyl group, the weight ratio of binder to said bisazo naphthol compound being about 10 :
- 1 to about 5 :
- 1 and the molar ratio of binder to said electron acceptor being about 10 :
- 1 to about 5 :
- 1, the particles of said bisazo compound having an average diameter smaller than 1 micron.
Dependencies are inferred from the claim text.