Reversible thermochromic composition

Details Reversible thermochromic composition Reversible thermochromic composition

C - Chemistry, Metallurgy

09

D

C09D 5/26 (2006.01) B41M 5/28 (2006.01) B41M 5/30 (2006.01) C09K 9/02 (2006.01)

Patent

CA 2138900

A reversible thermochromic composition develops fluorescent color of yellow, yellowish orange, orange, reddish orange, or red with a high color density and high color brightness, yet gives no residual color under non-color-developing conditions, and has remarkably improved light resistance. The reversible thermochromic composition, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from pyridine types, quinazoline types, and bisquinazoline types of compound, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.

Une composition thermochrome réversible donne une couleur fluorescente, jaune, orange jaunâtre, orange, orange rougeâtre ou rouge, à forte densité de couleur et grande brillance, sans former de couleur résiduelle dans des conditions non chromogènes; de plus, elle résiste remarquablement bien à la lumière. La composition thermochrome réversible renferme un mélange solubilisé de trois constituants : a) un composé organique chromogène, donneur d'électron, choisi parmi des pyridines, des quinazolines et des bisquinazolines; b) un composé accepteur d'électron pour le composé organique chromogène, donneur d'électron; c) un composé servant comme milieu de réaction pour produire de façon irréversible une réaction d'échange d'électron entre les constituants (a) et (b) dans un intervalle de température spécifié.

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