Thermochromic composition

Details Thermochromic composition Thermochromic composition

1993-08-10

1994-09-27

Hess, B. Hamilton

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

106 21R, 106 21A, 503205, 503206, 503216, 503217, 503225, B41M 5128

Patent

active

053506340

ABSTRACT:
A thermochromic composition which comprises (1) an electron-donating chromogenic organic compound, (2) an electron-accepting compound, and (3) at least one desensitizer selected from among diphenylamine derivatives of-the following formulas: ##STR1## wherein R.sup.1 and R.sup.2 each independently is H, an alkyl group containing 1 to 22 carbon atoms, ##STR2## (in which R.sup.3 and R.sup.4 each independently is H, an alkyl group containing 1 to 4 carbon atoms). A thermochromic composition which comprises (1) an electron-donating chromogenic organic compound, (2) an electron-accepting compound, (3) at least one desensitizer selected from among diphenylamine derivatives mentioned above, and (4) a thermochromic transition temperature modifier. A thermochromic composition which comprises one of the thermochromic compositions mentioned above as enclosed in microcapsule.

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