Example 1【Heat sensitive・pressure-sensitive dyes】

In these dyes for this application, we use leuco dye which develops color by contacting with acid.
In case of pressure sensitive copying papers, a paper coated by a capsule including dyes and a paper coated by developers are superimposed. By press these papers, the capsule is destroyed and dyes and developers are contacted each other and color is developed.
Heat sensitive recording papers have structure that dyes (color formers), developers and others are dispersed by poly-vinyl alcohol or others as texturizers and coated on the paper. The mechanism of color development is the melt mixing of dyes and developers by heating.

<Heat sensitive paper>

<Pressure-sensitive paper>

カテゴリー: Application examples of Dyes パーマリンク