(19)
(11) EP 0 684 613 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.06.1996 Bulletin 1996/26

(43) Date of publication A2:
29.11.1995 Bulletin 1995/48

(21) Application number: 95303674.6

(22) Date of filing: 30.05.1995
(51) International Patent Classification (IPC)6: H01B 1/12, H01B 1/24, G03G 15/02, C08G 18/02, G03G 15/08
(84) Designated Contracting States:
DE FR GB

(30) Priority: 27.05.1994 JP 138186/94
18.07.1994 JP 187745/94
26.07.1994 JP 174567/94
08.08.1994 JP 206011/94
08.08.1994 JP 206009/94

(71) Applicant: Bridgestone Corporation
Tokyo (JP)

(72) Inventors:
  • Nakajima, Tadashi
    Setagaya-ku, Tokyo (JP)
  • Masuda, Yoshitomo
    Hamura-shi, Tokyo (JP)
  • Takagi, Kouji
    Kodaira-shi, Tokyo (JP)
  • Kawagoe, Takahiro
    Tokorozawa-shi, Saitama-ken (JP)
  • Sawa, Eiji
    Fujisawa-shi, Kanagawa-ken (JP)
  • Fukuda, Hiroya
    Yokohama-shi, Kanagawa-ken (JP)
  • Miyamoto, Taro
    Kodaira-shi, Tokyo (JP)
  • Kaneda, Hiroshi
    Kodaira-shi, Tokyo (JP)

(74) Representative: Stoner, Gerard Patrick et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)

   


(54) Semiconductive polymer member, method for making the same, and device comprising the member


(57) A semiconductive polymer member is provided which comprises a semiconductive polymer composition, a polymer matrix and a conductive agent so that the member has an electric resistance ranging from 1 x 105 Ω ·cm to 1 x 1010 Ω ·cm when measured under conditions of a temperature of from 15 to 32.5°C, a relative humidity of from 10 to 85% and a measuring potential of from 10 to 5000 V and has a positional variation in the electric resistance of not larger than ±20%. In addition, the electric resistance determined under conditions of a temperature of 15°C and a relative humidity of 10% is not larger than 50 times an electric resistance determined under conditions of a temperature of 32.5°C and a relative humidity of 85%. When the semiconductive polymer member is in the form of a roller, such a roller is suitable for use in electrophotography especially when it is employed in combination with a power supply for transfer devices, or a constant current or voltage power supply.





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