Electrophotographic belt, electrophotographic apparatus, process for producing the electrophotographic belt, and intermediate transfer belt
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example 1
[0078] (i) Production of Base Layer:
[0079] A film composed of polyvinylidene fluoride resin containing an ionic conducting agent, having a thickness of 50 μm, a volume resistivity ρv of 2.5×109 Ωcm and a surface resistivity ρs of 1.8×1011 Ω / square, was produced by extrusion. Using this film, a cylindrical endless belt of 100 μm in thickness was produced according to the method described in Example 1 disclosed in Japanese Patent Application Laid-open No. 2002-326287. This cylindrical endless belt was used as the base layer of the electrophotographic belt. This cylindrical endless belt had the same volume resistivity and surface resistivity as those of the above film. Also, the mass loss percentage of the belt surface (the surface to be coated with the surface layer forming coating fluid described below) after the Taber abrasion test (ASTM D-1175; at a load of 4.9 N and 500 revolutions) was 0.41%.
[0080] (ii) Preparation of Surface Layer Forming Coating Fluid:
[0081] In a container s...
example 2
[0101] An electrophotographic belt was produced in the same manner as in Example 1 except that the surface layer (cured resin film) was formed in a thickness of 3.0 μm. Evaluation was made in the same way as in Example 1.
[0102] The mass loss percentage of the electrophotographic belt of Example 2 after the Taber abrasion test was 0%. The volume resistivity ρv and surface resistivity ρs of the electrophotographic belt of Example 2 were as shown below, and the surface resistivity was kept from vastly lowering, as with the electrophotographic belt of Example 1.
ρv=6.5×109 Ωcm,
ρs=1.5×1012 Ω / square,
ρs / ρv=2.3×102.
[0103] Next, the electrophotographic belt of Example 2 was used as the transfer material transport belt of the same electrophotographic apparatus as used in Example 1, and images were formed under the same conditions as in Example 1.
[0104] As a result, as with Example 1, the toner constituting toner images on the surface of the transfer material carried on the transfer materia...
example 3
[0106] An electrophotographic belt of Example 3 was produced in the same manner as in Example 1 except that the surface layer forming coating fluid, the application of the surface layer forming coating fluid on the base layer and the conditions for drying were as shown below.
[0107] (i) Preparation of surface Layer Forming Coating Fluid:
[0108] 12 parts by mass of an isopropyl alcohol sol of zinc antimonate as conductive particles (trade name of the sol: CELLNAX, available from Nissan Chemical Industries, Ltd.) was mixed with 50 parts by mass of an acrylic ultraviolet-curable hard coat material containing dipentaerythritol hexaacrylate (trade name of the coat material: DESOLITE; available from JSR Corporation). Thereafter, 38 parts by mass of methyl ethyl ketone (MEK) was added to obtain an ultraviolet-curable resin composition.
[0109] (ii) Production of Electrophotographic Belt:
[0110] In an environment of 25° C. / 40% RH, the surface layer forming coating fluid prepared in the above...
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