| 摘要 |
A thermochromic composition comprising: (i) at least one electron-donating organic chromogenic compound, (ii) at least one compound serving as a color developing material and selected from thiourea and derivatives thereof, guanidine and derivatives thereof, benzothiazole, and benzothiazolyl derivatives represented by the formula <IMAGE> (I) or <IMAGE> (II) wherein A is -H, <IMAGE> -NR2, -HxNR3 or -CSNR2 in which R is H, C1-C10 alkyl, benzyl optionally substituted with C1-C6 alkyl or cyclohexyl optionally substituted with C1-C6 alkyl, with the proviso that all of R in -NR2, -HxNR3 and -CSNR2 can not be H, and M is Cu, Zn, Fe, Ni, Co or Te, and (iii) and at least one compound serving as a desensitizer and selected from the group consisting of alcohols, esters, ketones, ethers, acid amides, carboxylic acids and hydrocarbons.
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