Heat sensitive recording material.

摘要

The present invention provides a heat sensitive recording material which is less in fog in background area and has superior color toning effect with high image storage stability which contain a fluoran compound represented by the following formula in addition to an aromatic isocyanate compound and an imino compound having at least one >C=NH group which forms color upon application of heat: <CHEM> wherein R1, R2 and R3 each represents a hydrogen atom, a lower alkyl group, a cyclohexyl group or an allyl group and R4 and R5 each represents a hydrogen atom, a lower alkyl group, a phenyl group, a cyclohexyl group or an aralkyl group. This heat sensitive recording material may further contain a heat fusible substance and/or a phenol compound to further improve heat responsivity or anti-fogging properties of background portion.