Electrophotographic recording element containing a naphtholactam dye sensitizer

An electrophotographic recording element comprising

• (A) an electrically conducting base and
• (B) at least one photoconductive layer consisting essentially of
• (b.sub.1) at least one binder,
• (b.sub.2) 0.5 to 20 parts by weight per 100 parts by weight of the binder (b.sub.1) of at least one sensitizer which on exposure of layer (B) generates charge carriers and which is being selected from the group of the naphtholactam dyes of the general structure I ##STR15## where the indices and variables are defined as follows:
• R.sup.1 is C.sub.1 -C.sub.22 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, .omega.-aryl-C.sub.1 -C.sub.6 -alkyl, aryl or C.sub.3 -C.sub.15 -alkylene, or
• R.sup.1 is halogen-, hydroxyl-, amino-, thiolo-, cyano-, oxyl-, alkyloxy-, cycloalkyloxy-, aryloxy-, arylalkyl-oxy-, alkylamino-, cycloalkylamino-, arylamino-, arylalkylamino-, alkane carbonyloxy-, cycloalkane-, carbonyloxy-, arylalkanecarbonyloxy-, aromatocarbonyloxy-, alkane carbonylamino-, cycloalkanecarbonylamino-, arylcarbonylamino-, aromatocarbonylamino-, alkyl-, ideneimino-, cycloalkylideneimino-, arylalkylideneimino-, carboxyl-, phosphono- and/or sulfo-substituted C.sub.1 -C.sub.22 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, .omega.-aryl-C.sub.1 -C.sub.6 -alkyl, aryl or C.sub.3 -C.sub.15 -alkylene, or
• R.sup.1 is a radical of the general formula II
• R.sup.5 --O--(CH.sub.2).sub.m p II
• where R.sup.5 is hydrogen, C.sub.1 -C.sub.6 -alkyl or C.sub.6 -C.sub.10 -aryl, m is an integer from 2 to 4 and independently thereof p is an integer from 1 to 10,
• R.sup.2 is a radical of the general formula 111 ##STR16## where R.sup.6 and R.sup.7 are identical to or different from each other and are each hydrogen, R.sup.1 or alkyl alkan-1-yl-.omega.-carboxylate and where Q is 1, 4-phenylene, 2-alkyl-1, 4-phenylene or 1, 4-naphthylene, or
• R.sup.2 is a radical of the general formula IV
• --Q--R.sup.8 IV
• where R.sup.8 is a substituted or unsubstituted, mono cyclic or fused heterocycle from the class of the azoles, azolines, azolimines, partially or completely hydrogenated azoles and partially or completely hydrogenated azepines which is bonded to Q via a nitrogen ring atom and where Q is as defined for the general formula III, or
• R.sup.2 is a substituted or unsubstituted, monocyclic or fused heterocycle from the class of the azoles, azolines, partially hydrogenated azines and azines which is bonded to the naphtholactam structure via a carbon ring atom, or
• R.sup.2 is a radical of the general formula V ##STR17## where the indices and variables are defined as follows:
• q is 0 or 1,
• r is independently of q 0, 1 or 2,
• R.sup.9 and R.sup.11 are each hydrogen or, if q is 1, together an unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted C.sub.2 -C.sub.3 -alkanediyl chain or one or two carbonyl groups,
• R.sup.10, are each hydrogen, halogen, oxygen, cyano, nitro, hydroxyl,
• R.sup.12 and R.sup.13 R.sup.1, C.sub.5 -C.sub.7 -alkoxy, C.sub.5 -C.sub.7 -cycloalkoxy, C.sub.6 -C.sub.10 -aryloxy, .omega.-phenyl-C.sub.1 -C.sub.6 -alkyloxy, C.sub.1 -C.sub.6 -alkoxycarbonyl, C.sub.5 -C.sub.7 -cycloalkyloxycarbonyl, C.sub.6 -C.sub.10 -aryloxycarbonyl, .omega.-phenyl-C.sub.1 -C.sub.6 -alkyloxycarbonyl, C.sub.1 -C.sub.6 -alkylaminocarbonyl, C.sub.5 -C.sub.7 -cycloalkylaminocarbonyl, C.sub.6 -C.sub.10 -arylaminocarbonyl, .omega.-phenyl-C.sub.1 -C.sub.6 -alkylaminocarbonyl or a substituted or unsubstituted, monocyclic or fused heterocycle from the class of the azoles, azolines, azines and partially hydrogenated azines, R.sup.10, R.sup.12 and R.sup.13 being identical or different from one another,
• R.sup.14 is R.sup.2 of the general formula III,
• R.sup.14 is R.sup.2 of the general formula IV,
• R.sup.14 is a substituted or unsubstituted, monocyclic or fused heterocycle from the class of the azoles, thiols, azolines, azolidines, azines, partially or completely hydrogenated azines and thiines which is bonded to the radical of the general formula v via a carbon ring atom, or
• R.sup.14 is a radical of the general formula VI ##STR18## where R.sup.1 is as defined above and where R.sup.3, R.sup.4, s and t are each as defined below, or
• R.sup.2 is a radical of the general formula VII ##STR19## where R.sup.1 is as defined above, R.sup.3, R.sup.4, s and t are each as defined below and where R.sup.15 is the radical
• of an acidic CH compound,
• s is 1, 2 or 3,
• t is independently of s 1, 2 or 3,
• R.sup.3 and R.sup.4 are each R.sup.10, R.sup.12, R.sup.13, R.sup.1, carboxyl, sulfo, and phosphono, C.sub.1 -C.sub.6 -alkyl-, C.sub.5 -C.sub.7 -cycloalkyl-, C.sub.6 -C.sub.10 -aryl- or .omega.-phenyl-C.sub.1 -C.sub.6 -alkyl-thio, -oxysulfonyl, -sulfonyl or -oxycarbonylaminyl, N,N-dialkyl-, N, N-diaryl-, N-alkyl-N-aryl-, N,N-di-(.omega.-arylalkyl)-, N-alkyl-N-(.omega.-arylalkyl)-, N-aryl-N (.omega.-arylalkyl)-, N,N-dicycloalkyl-, N-cycloalkyl-N-alkyl-, N-cycloalkyl-N-aryl- or N-cycloalkyl-N (.omega.-arylalkyl)-amino, -aminosulfonyl or -aminocarbonyl or if
• s=2 or 3,
• t=2 or 3 or
• s and t=1, 2 or 3
• a carbon, nitrogen, oxygen or sulfur atom which is part of the structure of one or more rings fused to the naphth-1, 8-ylene group, R.sup.3 and R.sup.4 being identical to or different from each other,
• X is an anion,
• and
• n is 0 or 1/3, 1/2, 2/3, 1, 2 or 3;
• and
• (b.sub.3) at least one photoconductor which transports the generated charge carriers.