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Carbon/Polycarbonate Recovery Process for Print Ribbon Reuse

IP.com Disclosure Number: IPCOM000038005D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Crooks, W: AUTHOR [+2]

Abstract

A technique is described whereby a recovery process allows polycarbonate polymer to be recovered from used ribbons, thereby permitting the re-use of the polymers and pigments which make up resistive print ribbons.

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Carbon/Polycarbonate Recovery Process for Print Ribbon Reuse

A technique is described whereby a recovery process allows polycarbonate polymer to be recovered from used ribbons, thereby permitting the re-use of the polymers and pigments which make up resistive print ribbons.

In the manufacture of ribbons for resistive ribbon thermal transfer printing, the carbon loaded polycarbonate is cast coated from dichloromethane solvent to a finished thickness of Z17mm. In the next step, it is coated with a Z1000 angstrom film of aluminum using a vacuum evaporation process. Finally, the thermoplastic pigment ink layer is coater applied from a solvent system in which the polycarbonate polymer is insoluble, such as for example, isopropyl alcohol for polymide thermoplastic resins.

The concept described herein essentially reverses the process. That is, the used ribbon, after chopping into suitably small pieces, is added with agitation to an isopropyl alcohol solvent to dissolve and remove the pigmented thermoplastic ink from the non-alcoholic soluble pigmented polycarbonate substrate material. After a suitable processing time, the solution is filtered to remove the insoluble pigmented polycarbonate material. The alcohol solution of thermoplastic resins can be further processed, adjusted for solids and viscosity, and can then be used to coat further (fresh) aluminized and pigmented polycarbonate substrate material.

The aluminized pigmented polycarbonate material which remains, af...