Importance

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Abstract

The developer for a thermal recording material of the present invention comprises a condensed composition consisting of, of condensates represented by the formula (1): 1 wherein R is a hydrogen atom, a hydroxyl group, a lower alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an aryl group or an aralkyl group, R in the number of m may be the same or different and m is an integer of 0-3, X and Y are each a hydrogen atom, an alkyl group or an aryl group, provided that at least one of X an dY is an alkyl group or an aryl group, and n is an integer of 0-3, a condensate having two cores wherein n=0 or a condensed composition comprising a condensate having two cores wherein n=0 as a main component, and at least one kind of condensate of the formula wherein n=1-3 (3-5 core condensate). The developer for thermal recording materials of the present invention is applied to a heat-coloring layer of thermal recording materials, along with a basic dye (preferably further with a sensitizer). According to the present invention, a developer for thermal recording materials, which is capable of realizing a thermal recording material capable of affording high colored image density and superior in preservation stability (particularly heat resistance and moisture resistance) of recorded images and non-image areas, while satisfying recent requirements for high sensitivity, can be obtained.

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First Claim