(19)
(11) EP 0 468 811 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.03.1992 Bulletin 1992/12

(43) Date of publication A2:
29.01.1992 Bulletin 1992/05

(21) Application number: 91306853.2

(22) Date of filing: 26.07.1991
(51) International Patent Classification (IPC)5: G03G 9/113
(84) Designated Contracting States:
DE GB

(30) Priority: 27.07.1990 JP 197890/90

(71) Applicant: KONICA CORPORATION
Tokyo 160 (JP)

(72) Inventors:
  • Tsujita, Kenji
    Hachioji-shi, Tokyo (JP)
  • Ohmura, Ken
    Hachioji-shi, Tokyo (JP)
  • Kouno, Shigenori
    Hachioji-shi, Tokyo (JP)

(74) Representative: Ellis-Jones, Patrick George Armine et al
J.A. KEMP & CO. 14 South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Carrier for developing electrostatic image


    (57) A carrier suitable for developing an electrostatic image which comprises core particles coated with a layer comprising fluorocarbon particles and porous resin particles;
       wherein the porous resin particles are composed of a plurality of elementary resin particles fused together at the surfaces thereof, the elementary resin particles having:

    (a) a particle size of not more than 0.5 µm;

    (b) a BET specific surface area of from 5 to 150 m²/g; and

    (c) a volume average particle size of from 1.5 to 5.0 µm.







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