Patent ID: 6090748
Filing Date: 2000-07-18
Classification: B41M

Abstract:
A reversible thermosensitive recording material comprising a recording layer which is formed overlying at least one side of a substrate and which comprises an electron donating coloring agent and an electron accepting coloring developer,wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a cooling speed (a), and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature, or when heated at a temperature not lower than the image forming temperature and then cooled relatively slowly compared to the cooling speed (a),and wherein the recording layer further comprises at least one color formation/erasure controlling agent having a formula selected from the group consisting of the following formulas (1) and (2):X1--(--R1--X2--).sub.n --R2 (1)wherein X1 represents a group selected from the group consisting of moieties in Table 3; X2 represents a divalent group selected from the group consisting of moieties in Table 4; R1 represents a divalent hydrocarbon group having from 2 to 20 carbon atoms, and when X1 is a carboxyl group, the R1 group adjacent to X1 is a linear hydrocarbon group having not less than 7 carbon atoms; R2 represents a hydrocarbon group having from 1 to 22 carbon atoms; and n is an integer of from 1 to 4, and when n is 2 or more, each of R1 may be the same or different from each other and each of X2 may be the same or different from each other; andR2--Y1--(--R1--Y2--).sub.n --R2' (2)wherein Y1 and Y2 are independently selected from the group consisting of moieties in Table 4; R1 represents a divalent hydrocarbon group having from 2 to 20 carbon atoms; R2 and R2' independently represent a hydrocarbon group having from 1 to 22 carbon atoms; and n is 0 or an integer of from 1 to 4, and when n is 2 or more, each of R1 may be the same or different from each other and each of Y2 may be the same or different from each other.