(19)
(11) EP 0 391 371 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.10.1991 Bulletin 1991/41

(43) Date of publication A2:
10.10.1990 Bulletin 1990/41

(21) Application number: 90106400.6

(22) Date of filing: 04.04.1990
(51) International Patent Classification (IPC)5: G03G 5/06, G03G 13/28
(84) Designated Contracting States:
DE GB NL

(30) Priority: 05.04.1989 JP 87657/89

(71) Applicant: MITSUBISHI PAPER MILLS, LTD.
Chiyoda-ku Tokyo (JP)

(72) Inventors:
  • Yamamoto, Hirokazu, c/o Tsukuba Kenkyusho
    Tsukuba-shi (JP)
  • Senga, Takao, c/o Tsukuba Kenkyusho
    Tsukuba-shi (JP)
  • Yamada, Jun, c/o Tsukuba Kenkyusho
    Tsukuba-shi (JP)

(74) Representative: Hansen, Bernd, Dr.rer.nat. et al
Hoffmann, Eitle & Partner Patentanwälte Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
       


    (54) Electrophotographic lithographic printing plate


    (57) The present invention provides an electro­photographic material for making lithographic printing plates which comprises an electrically conductive and hydrophilic base and, provided thereon, a photo­conductive layer, said photoconductive layer comprising:
    a resin binder soluble in at least one member selected from the group consisting of an alkali and an alcohol,
    an azo compound heat treated in an organic solvent excluding alcohol solvent and represented by the following formula (I):
    Cp₁ - N = N - A - N = N - Cp₂ (I)
    wherein A represents a divalent residue which bonds through its C atom to N atoms which constitute azo, Cp₁ and Cp₂ are identical or different and Cp₁ is a group represented by the formula:

    wherein Z represents a group of atoms necessary to form a substituted or unsubstituted carbocyclic aromatic ring, a substituted or unsubstituted heterocyclic aromatic ring or an unsaturated monocyclic hydrocarbon ring and R represents an aryl group having one or two CF₃ groups and
    a carrier transport material.





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