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Browse Prior Art Database

Method for Selective Color Printing

IP.com Disclosure Number: IPCOM000050940D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bernier, WE: AUTHOR [+4]

Abstract

Selective color printing is achieved by using a single energy pulse to activate the oxidant-catalyst on coated paper, followed by separate treatmant of the activated paper with various leucodyes.

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Method for Selective Color Printing

Selective color printing is achieved by using a single energy pulse to activate the oxidant-catalyst on coated paper, followed by separate treatmant of the activated paper with various leucodyes.

In electrochromic printing a multiple color print is achieved in a two-step procedure. Oxidant is generated on the surface of paper in the absence of leucodye. In a second stage the appropriate leucodye is applied to the paper to generate a designated dye color on the paper. Alternate lines of color characters can be formed in this way.

BACKGROUND

A colorless leucodye (LD) is coated on paper together with a concentrated electrolyte solution containing bromide. Upon activation of the paper surface with moisture, the surface becomes electrically conductive. The introduction of a suitable print pulse produces colored dots by the conversion of LD by a coupled pair of reactions. Step 1. 2 Br approaches Br + 2e : print pulse

Step 2. Br + LD approches Dye + 2Br : dye development.

Conventionally, the electrolyte and LD are present together in either the pretreated paper or the aqueous printing ink. Only a single color can be generated with a given coating.

PROPOSAL. The bromide approaches bromine reaction does not need to be coupled intimately with the LD approaches Dye conversion reaction. Paper can be coated with only the bromide electrolyte immediately prior to printing or electrolyte pretreated paper can be activated by the application of...