Importance

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Abstract

An electrophotographic recording material comprising on an electrically conductive support a positively chargeable photoconductive recording layer which contains in an electrically insulating organic polymeric binder material at least one photoconductive p-type pigment substance, and at least one n-type photoconductive charge transport substance selected from one of the following classes: (i) aromatic monoketones; (ii) aromatic polyketones; (iii) aromatic polyketones of (ii) condensed with at least one molecule of malonoitrile, a malononitrile monocarboxy ester or a malonic acid diester; (iv) cyano alkylene compounds; (v) aromatic compounds with at least one electron withdrawing substituent, wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 5 to 40% by weight of said p-type pigment substance and 0.0001 to 15% by weight of said n-type charge transport substance that is molecularly distributed in said electrically insulating organic polymeric binder material that has a volume resistivity of at least 10.sup.14 Ohm-m, and wherein said recording layer in electrostatically charged state requires for 10% and 90% discharge respectively exposures to conductivity increasing electromagnetic radiation that differ by a factor 5 or less.

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First Claim