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Poor Insulating Coating for Use in an Electrophotographic Process

IP.com Disclosure Number: IPCOM000085918D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cheng, W: AUTHOR [+4]

Abstract

A coating for the photoconductor drum seal on a high-speed electrophoto graphic printer, which prevents development of the seal in the reversal development process consists essentially of a small amount of an electrically conductive pigment dispersed in a resin. The electrically conductive pigment promotes slow dissipation of electrical charge and prevents pinholing and dielectric breakdown of the resin. Electrostatic charge retention is sufficient to prevent development in the reversal development process.

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Poor Insulating Coating for Use in an Electrophotographic Process

A coating for the photoconductor drum seal on a high-speed electrophoto graphic printer, which prevents development of the seal in the reversal development process consists essentially of a small amount of an electrically conductive pigment dispersed in a resin. The electrically conductive pigment promotes slow dissipation of electrical charge and prevents pinholing and dielectric breakdown of the resin. Electrostatic charge retention is sufficient to prevent development in the reversal development process.

Suitable resins can be epoxy, silicones, melamines, urea, acrylic, styrene- butadiene, polystyrene, alkyds, phenolics, urethanes, polyesters, vinyl resins, polyamide resins, etc. Other additives may be added to the coating to improve its functional properties. These include plasticizers, lubricants (TEFLON* powder) flow aids and dispersing aids for the electrically conductive pigment.

Electrically conductive pigments which can be used include metal pigments such as aluminum or copper, or inorganic semiconductors such as germanium, silicon or compounds such as zinc oxide, molybdenum disulfide, tungsten disulfide, tungsten diselenide and niobium diselenide. A preferred pigment is carbon.

Preferred coating formulations are as follows: A. 1. EXON* 461/470 20%
2. Ashbury 007-c 0.1% 3. Methyl ethyl ketone 79.9% 4. 2-methoxy ethyl acetate 50/50 EXON 461 is a fluorine containing poly-vinyl chloride resi...