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Organometallic Compounds in Electrochromic Printing

IP.com Disclosure Number: IPCOM000045937D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Engler, EM: AUTHOR [+3]

Abstract

Electrochromic printing is a printing technology in which an electric current is applied to a chemically pretreated paper. The electrical current causes conversion of a leuco-dye (colorless) to a colored dye form. Energy from the print electrode to the leuco-dye can be mediated by a redox couple such as Br/-//Br/2/. The paper is moistened to facilitate ion mobility. As an ink formulation on the paper, colorless organometallic compounds can be used which can be reduced to the colored metal form.

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Organometallic Compounds in Electrochromic Printing

Electrochromic printing is a printing technology in which an electric current is applied to a chemically pretreated paper. The electrical current causes conversion of a leuco-dye (colorless) to a colored dye form. Energy from the print electrode to the leuco-dye can be mediated by a redox couple such as Br/- //Br/2/. The paper is moistened to facilitate ion mobility. As an ink formulation on the paper, colorless organometallic compounds can be used which can be reduced to the colored metal form.

There are many constraints placed on the ink formulation. For instance, the ink must provide a high optical density in dye form and be colorless in leuco- form. It must also rapidly convert to the dye form and leave no background development of the leuco form, be water-- fast, nonvolatile, nontoxic, odorless, and have long shelf life. In particular, organotellurium dihalides are particularly suitable. These are stable, white, water-soluble compounds which can be readily reduced to tellurium metal and non-interfering organic byproducts. The printed tellurium is extremely stable, nonvolatile, water-fast, and black in appearance.

A reducing current from a print electrode converts R/2/TeCl/2/ to R/2/Te+2Cl/-/. The R/2/Te is unstable and changes to Te+R-R.

A wide variety of redox couples work to mediate the reduction of R/2/TeCl/2/ compounds, such as bisulfite, sulfide, cerous or ferrous ions, etc.

The nature of the R-substit...