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Coating Process for Preparation of a Charge Generation Layer

IP.com Disclosure Number: IPCOM000062710D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Pacansky, J: AUTHOR [+2]

Abstract

The photoconductor used in some photocopiers consists of a layered organic medium coated onto an aluminumized MYLAR* substrate. The photoconductor usually consists of at least three layers. The binder layer provides for proper adhesion of the charge-generation layer (CGL) to the aluminum substrate; the CGL contains a dye-like chlorodiane blue (CDB) that generates electron-hole pairs when exposed to light of the proper wavelength; the charge transport layer contains a material like p-diethylaminobenzaldehyde hydrazone (DEH) imbedded in a polymeric matrix for the transport of holes from the CGL to the surface of the photoconductor. Application of the CGL has been a problem because the dyes used to generate the electron-hole pairs, e.g., CDB, are almost insoluble in known solvents.

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Coating Process for Preparation of a Charge Generation Layer

The photoconductor used in some photocopiers consists of a layered organic medium coated onto an aluminumized MYLAR* substrate. The photoconductor usually consists of at least three layers. The binder layer provides for proper adhesion of the charge-generation layer (CGL) to the aluminum substrate; the CGL contains a dye-like chlorodiane blue (CDB) that generates electron-hole pairs when exposed to light of the proper wavelength; the charge transport layer contains a material like p-diethylaminobenzaldehyde hydrazone (DEH) imbedded in a polymeric matrix for the transport of holes from the CGL to the surface of the photoconductor. Application of the CGL has been a problem because the dyes used to generate the electron-hole pairs, e.g., CDB, are almost insoluble in known solvents. Ethylene diamine (EDA) is usually used to coat CDB. Several problems arise because of its use: first, EDA is a toxic material, and, second, solutions of EDA and CDB are unstable during the coating process, and because of this, the CGL layer ultimately produced varies in uniformity. Monomeric acrylates may be used to prepare a CGL. The coating process is similar to the EDA/CDB system in that a mixture of acrylate and CDB is coated onto a sublayer and subsequently the acrylate is thermally removed from the film. For example, a solution of VPE 6535A in THF solvent was used to cast a thin sublayer on an aluminum Mylar* substrate. Af...