NEW COMPOSITION FOR THE COLOUR DEVELOPING COATING IN PRESSURE SENSITIVE CARBONLESS COPYING SYSTEMS

摘要

A color developer sheet for use in pressure-sensitive carbonless, copying sets contains preponderantly white Mg Al silicate as (part of) the color developer material. The Mg Al silicate material is pref. an essentially pure chlorite mineral with limited Fe content. The Mg Al silicate gives deep permanent colors on contact with the color-forming material. Smooth coatings can be formed by normal paper coating techniques, using high solid-content coating compsns. having low viscosity and rapid drying times. The coatings have good color retention and do not turn grey or yellow in storage.