Color-shifted dyes with thermally unstable carbamate moiety comprising T-alkoxycarbonyl group

摘要

This invention relates to a color-shifted dye compounds containing at least one thermally unstable carbamate moiety which are useful in thermal imaging. These compounds may be represented by the formula [M-(X)q]pD wherein M is a carbamate moiety; X is -N=, -SO2- or -CH2-; D taken with X and M represents the radical of a color-shifted organic dye, said carbamate moiety M comprising a tert-alkoxycarbonyl group, <IMAGE> wherein R' is halomethyl or alkyl.