Thermochromic ink formulations, nail lacquer and methods of use

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/00 (2006.01) A61Q 3/02 (2006.01) B41M 3/12 (2006.01) B41M 5/28 (2006.01) C09D 5/26 (2006.01)

Patent

CA 2201397

The present invention comprises a series of discoveries related to the problems associated with formulations that destroy the color change properties of thermochromic encapsulated dyes. One aspect of the present invention is the discovery of a method of correcting these formulations to allow the addition of thermochromic dyes. Certain solvents destroy the dye, therefore any aldehydes, ketones, and diols, and most aromatic compounds should be removed from the formulation and if needed they should be replaced with solvents preferably having a large molecular weight (i.e. greater than 100 and low reactivity). Secondly, the formulation should be adjusted to be neutral (i.e. 6.5-7.5 pH) or have a low acid value. These two adjustments will allow the thermochromic dyes to be added to the formulation without a loss of its color change properties.

La présente invention comprend une série de découvertes relatives aux problèmes associés aux compositions qui détruisent les propriétés de changement de couleur de colorants encapsulés thermochromiques. Un aspect de la présente invention concerne un procédé de correction desdites compositions pour permettre l'ajout de colorants thermochromiques. Certains solvants détruisent le colorant. Par conséquent, les aldéhydes, cétones et diols et la plupart des composés aromatiques devraient être éliminés de la composition et, si nécessaire, remplacés par des solvants ayant de préférence un poids moléculaire élevé (c'est-à-dire supérieur à 100 et une faible réactivité). Deuxièmement, ladite composition devrait être ajustée pour être neutre (soit un pH de 6, 5 à 7,5) ou avoir une faible valeur acide. Ces deux ajustements permettent d'ajouter les colorants thermochromiques à la composition sans perte des propriétés de changement de couleur.

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