Browse Prior Art Database

ENVIRONMENTALLY FRIENDLY XEROGRAPHIC TRANSPARENCY

IP.com Disclosure Number: IPCOM000027422D
Original Publication Date: 1996-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 101K

Publishing Venue

Xerox Disclosure Journal

Abstract

Overhead transparencies are a substantial fraction of mixed office waste, and are currently not recyclable due, in large part, to the toner images thereon. Current transparencies are formed from a thermally-stable base sheet, such as MYLAR, with a thin toner-compatible overcoating resin. Disclosed is a coating composed of any of a class of base-soluble resins such as polyimides, polyester imides, polyimide imines, and the like resins. In a caustic recycling step, the overcoating dissolves, carrying with it the fused toner images.

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XEROX DISCLOSURE JOURNAL

ENVIRONMENTALLY FRIENDLY XEROGRAPHIC TRANSPARENCY
J. Stephen Kittelberger Guerino G. Sacripante Shadi Malhotra

Proposed Classification
U. S. C1.430/110 Int. C1. G03g 09/08

Overhead transparencies are a substantial fraction of mixed office waste, and are currently not recyclable due, in large part, to the toner images thereon. Current transparencies are formed from a thermally-stable base sheet, such as MYLAR, with a thin toner-compatible overcoating resin. Disclosed is a coating composed of any of a class of base-soluble resins such as polyimides, polyester imides, polyimide imines, and the like resins. In a caustic recycling step, the overcoating dissolves, carrying with it the fused toner images.

Transparencies are composed of a thermally-stable base sheet of MYLAR or other polyesters which retain dimensional and optical properties at fuser temperatures. This layer is typically about 0.004" thick. An overcoating of 0.0005" or less is applied to the base sheet to allow thermal fusion with the toner image. The overcoating resins are thermally very similar to toner resins, having Tg values and chemical compatibilities similar to toner resins. Current overcoating resins are soluble only in organic solvents.

Thus, overcoatings are selected from polycondensation resins which are soluble in mild caustic aqueous solutions. An agitated caustic bath is the standard first step in de-inking paper. The disclosed transparency is stripped and de-inked using the same equipment and process found in paper de-inking mills.

EXAMPLE

A MYLAR transparency was coated with about a 5 micron thickness of a polyimide resin (Tg=55"C) by solution coating. The transparency was then fused with an i...