Heat sensitive system and use thereof

Details Heat sensitive system and use thereof Heat sensitive system and use thereof

1992-12-09

1995-06-27

Han, Frances

Printed matter

Method

283 91, 283 94, 283 95, 283 57, 283 58, 283902, 283904, 359 43, 359288, B42D, B42D

Patent

active

054274150

ABSTRACT:
A heat sensitive system comprises a document having a localized, non-pressure sensitive, coating of chromogenic composition activated at moderate temperatures. Quickly striking the chromogenic composition with a fingernail or blunt object produces a colored image by frictional heat. The chromogenic composition contains a chromogenic compound and a color developer which are non-pressure sensitive and non-reactive at room temperature. The chromogenic composition can be an intimate mixture of the chromogenic compound and the developer or alternatively separate layers of each of the components.

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