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Browse Prior Art Database

COATING COMPOSITION TO ENHANCE DURABILITY OF XEROGRAPHIC IMAGES

IP.com Disclosure Number: IPCOM000025937D
Original Publication Date: 1989-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

Normally copies produced from electrostatographic printing apparatus have fixed toner images of adequate durability for typical uses such as filing, anotating and reference work. Furthermore, many of them are suitable for additional exposure to aggressive environment such as automated document processing apparatus. For some environments, however, these fused toner images lack the durability, abrasion resistance and liquid spill tolerance to perform as well as desired or as well as, for example, heat set offset printed images. These difficulties can be overcome by providing a synthetic coating for the copy sheets which comprises a thermoplastic resin which is wetted by the toner material and a plasticizer which is solid at room temperature but which is fluid at the fusing temperature. This combination is solid at room temperature and there is no blocking concern at ordinary temperatures but it becomes sufficiently fluid at the fusing temperature to afford an enhanced toner anchorage to the copy sheet. A typical example comprises a 25% solid solution of:

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KEROX DISCLOSURE JOURNAL

COATING COMPOSITION TO Proposed Classification ENHANCE DURABILITY OF U.S. C1.428/144 XEROGRAPHIC IMAGES
Int. Norman A. Nielsen C1. B32b 3/10

Normally copies produced from electrostatographic printing apparatus have fixed toner images of adequate durability for typical uses such as filing, anotating and reference work. Furthermore, many of them are suitable for additional exposure to aggressive environment such as automated document processing apparatus. For some environments, however, these fused toner images lack the durability, abrasion resistance and liquid spill tolerance to perform as well as desired or as well as, for example, heat set offset printed images. These difficulties can be overcome by providing a synthetic coating for the copy sheets which comprises a thermoplastic resin which is wetted by the toner material and a plasticizer which is solid at room temperature but which is fluid at the fusing temperature. This combination is solid at room temperature and there is no blocking concern at ordinary temperatures but it becomes sufficiently fluid at the fusing temperature to afford an enhanced toner anchorage to the copy sheet. A typical example comprises a 25% solid solution of:

Elvacite 2044 68 parts VMCH 12 parts Santicizer -9 20 parts Cyastate 609 0.5 parts

in toluene/methylethyl ketone solvent

Elvacite 2044 is a soft acrylic resin, a copolymer of methylmethacrylate and butylacrylate available from E. I. duPont de Nemours &...