Semiconductive belt
AssigneeNitto Denko Corporation
InventorsMasao Nakamura, Toshihiko Tomita, Masakazu Sugimoto, Junichi Nakazono, Toshiaki Iwamoto
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Abstract
A semiconductive belt comprising a polyimide film having a volume resistivity of 109 Ωcm to 1016 Ωcm and a surface resistivity of 1010 Ω to 1017 Ω at 25° C. and 60% RH, wherein the amount of change of the surface resistivity between 30° C. and 85% RH and 10° C. and 15% RH in terms of common logarithm being is 1.0 or smaller.
Claims6
A semiconductive belt comprising a polyimide film and carbon black as a conductive filler, said film having a moisture absorption and swelling coefficient of 2.0/105 cm/cm/% RH or less, a volume resistivity of 109 Ωcm to 1016 Ωcm and a surface resistivity of 1010 Ω to 1017 Ω at 25° C. and 60% RH, wherein the amount of change of the surface resistivity between 30° C. and 85% RH and 1 0° C. and 15% RH in terms of common logarithm is 1.0 or smaller.
A semniconductive belt comprising a polyimide film comprising carbon black as a conductive filler and polyimide prepared from a composition containing 3,3′, 4,4′-biphenyl tetracarboxylic dianhydride as an acid component in an amount of 50 mol % or larger based on the total amount of acid components, said film having a volume resistivity of 109 Ωcm to 1016 Ωcm, a moisture absorption and swelling coefficient of 2.0/105 cm/cm/% RH or less and a surface resistivity of 1010 Ω to 1017 Ω at 25° C. and 60% RH, and wherein the amount of change of the surface resistivity between 30° C. and 85% RH and 10° C. and 15% RH in terms of common logarithm is 1.0 or smaller.
Dependencies are inferred from the claim text.