Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1998-12-30
2001-10-09
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S496000, C523S215000
Reexamination Certificate
active
06300406
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a moderately electrically conducting resin composition and to a molded article obtained from such a resin.
JP-A-H7-113029 discloses a moderately electrically conducting resin composition which includes a polyvinylidene fluoride resin, carbon black and a thermoplastic polyether resin and which is used for producing molded articles. The known composition has a problem because it is necessary to strictly control the amount of the carbon black and the mixing conditions in order to obtain a desired electric conductivity.
Additionally, the electric conductivity (or electric resistivity) of a molded product obtained from the known composition depends upon a voltage applied thereto and, moreover, varies when subjected to repeated voltage impression. Thus, if such a composition is used for an intermediate image transfer element of an electrophotographic image forming apparatus, an image density is apt to change upon repeated uses.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a moderately electrically conducting resin composition whose electric resistivity can be accurately and easily controlled and which can give a molded product having a uniform electric resistivity throughout its whole body.
Another object of the present invention is to provide a moderately electrically conducting resin composition whose electric resistivity is low in voltage dependency or environment dependency.
It is a further object of the present invention to provide a moderately electrically conducting resin composition whose electric resistivity does not significantly vary even when subjected to repeated voltage application.
It is yet a further object of the present invention to provide a seamless endless belt suitable as an intermediate image transfer element for an electrophotographic image forming apparatus.
It is still yet a further object of the present invention to provide a molded article having excellent workability and physical and mechanical properties.
In accordance with the present invention there is provided a resin composition comprising 100 parts by weight of a thermoplastic fluorine-containing resin, 1-40 parts by weight of polymer-grafted carbon black, 1-15 parts by weight of a thermoplastic polyether resin, and 0-2 parts by weight of an electrolyte.
The present invention also provides a molded article obtained from the above resin composition.
In the present specification and appended claims, the term “volume resistivity” is as measured at 23° C. under a relative humidity of 50% with an impressed voltage of 500 V. An electric resistivity measuring device (HIRESTA IP manufactured by Mitsubish Chemical Corporation with an HRS probe) is used for measuring a volume resistivity.
REFERENCES:
patent: 5952429 (1999-09-01), Ikeda et al.
patent: 409324133 (1997-12-01), None
patent: 410007865 (1998-01-01), None
Akaki Hideyuki
Kanaoka Kunio
Okunaka Kazuki
Takechi Shigetoshi
Tange Yoshihiro
Lorusso & Loud
Okura Industrial Co., Ltd.
Rajguru U. K.
Seidleck James J.
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