Claims
- 1. An electrophotographic recording material comprising an electrically conductive support and a photosensitive recording layer having charge generating capacity by photo-exposure and containing as photoconductive pigment a photoconductive crystalline substituted metal-free phthalocyanine compound and/or mixed crystal pigment of said substituted metal-free phthalocyanine compound with an unsubstituted metal-free phthalocyanine, characterized in that said substituted metal-free phthalocyanine compound is represented by following general formula (I): wherein: R represents cyano substituent in ortho-position on at least one of the 6-membered rings in the phthalocyanine structure in which each substituted 6-membered ring is only mono-substituted, the possible ortho-positions being marked by asterisk (*), and x is an integer 1, 2, 3 or 4, wherein the major part by weight of said substituted metal-free phthalocyanine compound and mixed crystals of said substituted metal-free phthalocyanine compound with unsubstituted metal-free phthalcyanine is (are) present in the X-morphological form and wherein said electrically conductive support has thereon a positively chargeable photoconductive recording layer which contains in an electrically insulating organic polymer binder at least one p-type pigment substance and at least one n-type photoconductive charge transport substance, wherein (i) at least one of the p-type pigment substances is a compound corresponding to said general formula (I) mainly in morphological X-type form or a mixed crystal pigment mainly with an X-morphology comprising a p-type compound corresponding to said general formula (I) in a molar ratio range from 0.14:1 to 3.3:1 with p-type unsubstituted metal-free phthalocyanine, (ii) said layer has a thickness in the range of 4 to 40 μm and comprises 5 to 40% by weight of said p-type pigment substances and 0.0001 to 15% by weight of at least one of said n-type charge transport substance(s) that is (are) molecularly distributed in said electrically insulating organic polymeric binder material that has a volume resistivity of at least 1014 Ohm-m, and wherein (iii) 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 4.5 or less.
- 2. Electrophotographic recording material according to claim 1, wherein said photoconductive recording layer has a thickness in the range of 5 to 35 μm and contains 6 to 30% by weight of said p-type pigment material(s) and 0.001 to 12% by weight of said n-type transport substance(s).
Priority Claims (1)
Number |
Date |
Country |
Kind |
92201616 |
Jun 1992 |
EP |
|
Parent Case Info
This is a continuation of application Ser. No. 08/059,588 filed on May 12, 1993 abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2051364 |
Jul 1992 |
CA |
63-313166 |
Dec 1988 |
JP |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/059588 |
May 1993 |
US |
Child |
08/409946 |
|
US |