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Printing Using Water-Insoluble Electrochromic Leucodyes

IP.com Disclosure Number: IPCOM000044691D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bernier, WC: AUTHOR [+2]

Abstract

The following processes utilize high water-insoluble organic leucodyes for electrochromic printing.

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Printing Using Water-Insoluble Electrochromic Leucodyes

The following processes utilize high water-insoluble organic leucodyes for electrochromic printing.

L. Coating

L. Coating

a) The insoluble leucodye alone is applied to

paper

in the form of a solution in an organic solvent

(acetonitrile, alcohols, acetone, furanes, etc.).

The solvent evaporates, and the paper dries.

b) Alternatively, the organic compound can be

applied

to paper from a water-solvent mixture, as an

emulsion or colloidal suspension.

2. Printing

(a) The dry pretreated paper of la) or lb) is

printed

upon by applying a solution of a regular electro-

lyte (see below) containing all components except

the electrochromic dye.

(b) In cases in which a combination of colors is

desired, the electrolyte can obtain a different

organic dye from that originally applied to the

paper. Therefore, the color of printed characters

will be given by the combination of the two dyes.

As examples of useful leucodyes, there may be mentioned benzoyl-leuco-methylene blue, diphenylmethane compounds (leucoauramine), triphenylmethane compounds (leuco malachite green), leuco azine compounds (reduced indigo and indigonoids), leucophthalocyanine compounds (leuco cobalt phthalocyanin) and hydroxy compounds (dioxyindole).

Anonymous

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