Color forming dye precursor, composition containing the same and color forming heat-sensitive recording material

摘要

Provided is an electron donating dye precursor represented by the following formula (1), (2), (3) or (4) as defined in the specification which each singly develops two colors upon color forming reaction with one kind of an electron accepting color developer depending on change in the heat energy applied. Furthermore, a heat-sensitive recording material comprising a support and a recording layer containing said electron donating dye precursor and an electron accepting color developer is provided. Moreover, a method for heat sensitive recording of multi-color images using said heat-sensitive recording material is provided.