Thermochromic compositions
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United States of America Patent
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-
Nov 4, 1986
Grant Date -
N/A
app pub date -
Oct 29, 1984
filing date -
Nov 4, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 ##STR1## wherein A is --H, ##STR2## --NR.sub.2, --H.multidot.NR.sub.3 or --CSNR.sub.2 in which R is H, C.sub.1 -C.sub.10 alkyl, benzyl optionally substituted with C.sub.1 -C.sub.6 alkyl or cyclohexyl optionally substituted with C.sub.1 -C.sub.6 alkyl, with the proviso that all of R in --NR.sub.2, --H.multidot.NR.sub.3 and --CSNR.sub.2 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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