Charge Blocking Layers Prepared from Alcoxide and Acetylacetonate Compounds of Ti and Zr for Overcoated Xerographic Photoreceptors

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  • 半導電性表面保護層を設けた電子写真感光体における電荷注入(II)
  • 半導電性表面保護層を設けた電子写真感光体における電荷注入-2-有機チタンおよびジルコニウム化合物皮膜による電荷注入阻止
  • ハン ドウデンセイ ヒョウメン ホゴソウ オ モウケタ デンシ シャシン カン
  • — 有機チタンおよびジルコニウム化合物皮膜による電荷注入阻止 —

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The film properties and the xerographic characteristics of charge blocking layers, made from alcoxide and acetylacetonate compounds of Ti and Zr, for overcoated xerographic photoreceptors have been investigated. These films are simillar to TiO2 and ZrO2, but superior in uniformity, solvent resistance and adhesive property. The charge acceptance of As2Se3 and Se-SeTe photoreceptors with a protective overcoat layer of 1,1'-Dimethylferrocene doped in polyarylate, or SnO2/Sb2O3 conductive powder dispersed in polyacrylurethane, reduces to 1/10 of the value without the overcoat. An insertion of 0.2 μm thick film of this blocking layer restores the charge acceptance. The optimum materials, i.e. the alcoxide or acetylacetonate compounds of Zr with an additive of 20 ? 30 % silane coupling agent, can remove image blurring even under high humidity conditions. It is also found through I-V measurements and mathematical modeling that the charge blocking layer should be partially conductive, and the electric field dependence of resistivity should be small. The overcoated photoreceptors with the charge blocking layer have been used in the commercial copy machines.

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