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Undercoat Layer via Filled Anodize

IP.com Disclosure Number: IPCOM000033719D
Publication Date: 2004-Dec-23
Document File: 1 page(s) / 28K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure describes the preparation of a filled undercoat layer that consists of an anodized layer whose pores are filled with precipitated reaction products or reaction constituents. This is achieved by submerging an anodized photoreceptor substrate in a dilute solution of a reactant, rinsing the excess and a submersion in a solution of the second reactant. The reagents react to fill the pores of the anodized layer. The reaction of iron (III) nitrate with potassium ferrocyanide to form Prussian Blue is given as an example. The method can be extended to include oxides and sulfides. The layer must be at least 15 microns thick. The resultant anodized layer is harder, more corrosion resistant, and have better dielectric characteristics than the current undercoat layer for life extension.

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Undercoat Layer via Filled Anodize

This disclosure describes the preparation of a filled undercoat layer that consists of an anodized layer whose pores are filled with precipitated reaction products or reaction constituents. This is achieved by submerging an anodized photoreceptor substrate in a dilute solution of a reactant, rinsing the excess and a submersion in a solution of the second reactant. The reagents react to fill the pores of the anodized layer. The reaction of iron (III) nitrate with potassium ferrocyanide to form Prussian Blue is given as an example. The method can be extended to include oxides and sulfides. The layer must be at least 15 microns thick. The resultant anodized layer is harder, more corrosion resistant, and have better dielectric characteristics than the current undercoat layer for life extension.

Background

The historical function of the undercoat layer in an electrophotographic photoreceptor is to provide dielectric strength and conductivity.  More recently, the undercoat layer also functions as a light scattering layer to reduce the effects of interference within the photoreceptor caused by reflections from coherent light incident on a base ground plane.  Improved corrosion resistance, a harder layer, and better (more uniform) dielectric characteristics are being sought as these characteristics are required for photoreceptor longer life.

To this end, anodizing is being explored and used in combination with the undercoat layer or layers.  US  Patents (4,800,144; 5,723,241...