Functional Materials for Direct Thermal Full Color Recording Paper

Abstract

A new direct thermal full color recording paper named TA paper has been on the market. TA paper has three recording layers : an outermost yellow color forming layer, a magenta layer and an innermost cyan color forming layer. The yellow color forming layer comprises a diazonium salt decomposable by 420 nm light and a coupler which reacts to form a yellow dye. The magenta comprises a diazonium salt decomposable by 365 nm light and a coupler which reacts to form a magenta dye. The cyan color forming layer comprises a basic leuco dye and a phenolic color developer.
In this article we will describe how to design functional materials for TA paper such as diazonium salts, couplers, basic leuco dyes, phenolic color developers and ultraviolet absorber precursors.