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Electrophotographic Toners

IP.com Disclosure Number: IPCOM000090347D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chadwell, RJ: AUTHOR [+2]

Abstract

In the process of electrophotography, latent electrostatic images of an original are formed on the surface of a photoconductive insulating material. These images are then developed by contacting the surface of the photoconductor with finely divided electroscopic marking particles which are attracted to the image areas. The particles are comprised of pigment materials dispersed in a thermoplastic resin binder so that they can be transferred to a copy sheet and heat fused to the sheet to form a permanent record. Suitable electroscopic toners comprise a solid epoxy resin having a molecular weight above about 2000, formed by the reaction of, for example, bisphenol A and epichlorohydrin, containing 5 to 15% by weight pigment and 1 to 5% by weight of a plasticizer. Epoxy Resin, Epon 1007 Shell Chemical Co. Mol. wt. 2900, 90.

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Electrophotographic Toners

In the process of electrophotography, latent electrostatic images of an original are formed on the surface of a photoconductive insulating material. These images are then developed by contacting the surface of the photoconductor with finely divided electroscopic marking particles which are attracted to the image areas. The particles are comprised of pigment materials dispersed in a thermoplastic resin binder so that they can be transferred to a copy sheet and heat fused to the sheet to form a permanent record. Suitable electroscopic toners comprise a solid epoxy resin having a molecular weight above about 2000, formed by the reaction of, for example, bisphenol A and epichlorohydrin, containing 5 to 15% by weight pigment and 1 to 5% by weight of a plasticizer. Epoxy Resin, Epon 1007 Shell Chemical Co. Mol. wt. 2900, 90.5% Carbon Black 8.0% Polyvinyl Stearate 1.5%

The components are blended, ground and then jet-milled to an average particle size of about 15 microns.

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