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AssigneeRicoh Company, Ltd.
InventorsHidetoshi Kami, Tetsuro Suzuki, Narihito Kojima, Hiroshi Nagame, Hiroshi Tamura, Yohta Sakon, Hiroshi Ikuno
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An electrophotographic photoconductor including a photoconductive layer which is formed overlying an electroconductive substrate and which includes at least a charge transporting polymer material, wherein the photoconductive layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.-2 .multidot.24 h.sup.-1. The photoconductive layer may be a functionally separated photoconductive layer including a charge generating layer and a charge transporting layer which is formed overlying the charge generating layer and which includes the charge transporting polymer material, wherein the charge transporting layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.2 .multidot.24 h.sup.-1.
An electrophotographic photoconductor comprising a photoconductive layer over an electroconductive substrate, wherein the photoconductive layer comprises a charge transporting polymer material, and wherein the photoconductive layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.-2 .multidot.24 h.sup.-1, wherein the photoconductive layer further comprises a low molecular compound having a molecular weight less than about 10,000, and wherein the low molecular compound is present in a charge transporting layer of the photoconductive layer in an amount of not greater than about 30% by weight.
An electrophotographic photoconductor comprising a photoconductive layer over an electroconductive substrate, wherein the photoconductive layer comprises a charge transporting polymer material, and wherein the photoconductive layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.-2 .multidot.24 h.sup.-1, wherein the charge transporting polymer material comprises a repeating unit having a triarylamine structure and a repeating unit having an electrically inactive structure, and wherein the repeating unit having an electrically inactive structure is selected from the group consisting of repeating units which form homopolymer films having a water vapor permeability not greater than about 120 g.multidot.m.sup.-2 .multidot.24 h.sup.-1, when the same thickness as the charge transporting layer.
Dependencies are inferred from the claim text.