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Micronizing Process for Photoconductive Pigments

IP.com Disclosure Number: IPCOM000081221D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chang, LS: AUTHOR

Abstract

Photoconductive pigment particles are often prepared for use by a micronizing process. It has now been found that the dark decay of such photoconductors is very much reduced and the cycling fatigue at room temperature and elevated temperatures is eliminated, when the micronizing process takes place in the presence of epoxide or amino functional silanes. This result has been observed, for example, with the pigment chlorodiane blue using such silanes as Dow Corning's Z-6040 (an epoxide functional silane) or Dow Corning's Z-6020 (an amino functional silane).

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Micronizing Process for Photoconductive Pigments

Photoconductive pigment particles are often prepared for use by a micronizing process. It has now been found that the dark decay of such photoconductors is very much reduced and the cycling fatigue at room temperature and elevated temperatures is eliminated, when the micronizing process takes place in the presence of epoxide or amino functional silanes. This result has been observed, for example, with the pigment chlorodiane blue using such silanes as Dow Corning's Z-6040 (an epoxide functional silane) or Dow Corning's Z-6020 (an amino functional silane).

The operation is preferably carried out by micronizing the pigment with a dilute (about 10% on the weight of pigment) solution of the silane in a solvent such as tetrahydrofuran.

The same improvement in the performance of the photoconductor is realized Whether the pigment dispersion that has been treated with silane is applied directly to the aluminized MYLAR* substrate, or applied to a polymer sublayer (sometimes known as barrier layer) coated on the substrate prior to the pigment application. * Trademark of E. I. du Pont de Nemours & Co.

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