(19)
(11) EP 0 435 610 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.09.1991 Bulletin 1991/37

(43) Date of publication A2:
03.07.1991 Bulletin 1991/27

(21) Application number: 90314134.9

(22) Date of filing: 21.12.1990
(51) International Patent Classification (IPC)5: G03G 9/097, G03G 9/087
(84) Designated Contracting States:
DE GB

(30) Priority: 27.12.1989 JP 336728/89

(71) Applicant: KONICA CORPORATION
Tokyo 163 (JP)

(72) Inventors:
  • Yamane, Kenji, c/o Konica Corporation
    Hachiioji-shi, Tokyo (JP)
  • Yamazaki, Hiroshi, c/o Konica Corporation
    Hachiioji-shi, Tokyo (JP)

(74) Representative: Senior, Alan Murray et al
J.A. KEMP & CO., 14 South Square, Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Developer and image forming process


    (57) A developer for an electrophotographic image forming process comprising a toner which comprises colored particles containing at least a resin and a colorant, and composite particles comprising inorganic particles having an average particle size of 0.01 to 1 µm attached to the surface of resin particles having an average particle-size of 0.1 to 7 µm, the resin of the resin particles having a yield point of between 10 and 500 kg/cm² at 20°C.






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