CAPSULE TYPE THERMAL SENSITIVE PIGMENT COMPOSITION

摘要

The color former such as Leuco dyestuff and developer are integrated into a pigment capsule and the mixture of the several capsules is processed to the one pigment microcapsule. When two kinds or more of Leuco dyestuffs are intermixed into one capsule, the freezing point depression accures by the intermixing of Leuco dyestuffs so the range of the color changing temperature becomes narrower, which is thr reason of the instantaneous color change.