(19)
(11) EP 0 397 146 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.04.1991 Bulletin 1991/17

(43) Date of publication A2:
14.11.1990 Bulletin 1990/46

(21) Application number: 90108738.7

(22) Date of filing: 09.05.1990
(51) International Patent Classification (IPC)5: G03G 5/047
(84) Designated Contracting States:
CH DE FR GB IT LI NL

(30) Priority: 09.05.1989 JP 114308/89
30.11.1989 JP 313645/89

(71) Applicant: MITA INDUSTRIAL CO., LTD.
Osaka 540 (JP)

(72) Inventors:
  • Iwasaki, Hiroaki
    Hirakata-shi, Osaka-fu (JP)
  • Takesawa, Youichi
    Suita-shi, Osaka-fu (JP)
  • Takemoto, Hiroshi
    Osaka-shi (JP)
  • Tanaka, Masashi
    Osaka-fu (JP)
  • Kimoto, Keizo
    Hirakata-shi, Osaka-fu (JP)
  • Sakuma, Tadashi
    Sakai-shi, Osaka-fu (JP)

(74) Representative: Hiltl, Elmar, Dr. et al
DIEHL.GLAESER.HILTL & PARTNER, Patentanwälte, Postfach 19 03 65
D-80603 München
D-80603 München (DE)


(56) References cited: : 
   
       


    (54) Laminate type photosensitive material for electrophotography


    (57) Disclosed is a laminate type photosensitive material for the electrophotography, which comprises a charge-generating layer and a charge-transporting layer, which are formed on an electroconductive substrate, wherein the charge-transporting layer comprises a first charge-transporting material having an ionization potential smaller than that of a charge-generating material used for the charge-generating layer and a second charge-transporting material having an ionization potential larger than that of the charge-generating material.
    In this photosensitive material, by using a charge-transporting material having an ionization potential larger than that of the charge-generating material in combination with the charge-transporting material having an ionization potential smaller than that of the charge-generating material, a good residual potential can be maintained without disturbing injection of holes in the charge-transporting layer, the stability of the surface potential at the repeated use is improved and a good charging capacity can be attained.







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