Thermochromic ink formulations, nail lacquer and methods of use

Details Thermochromic ink formulations, nail lacquer and methods of use Thermochromic ink formulations, nail lacquer and methods of use

B - Operations, Transporting

41

M

B41M 5/28 (2006.01) B41M 1/06 (2006.01) B41M 3/14 (2006.01) B44F 1/12 (2006.01) C09D 5/30 (2006.01) C09D 11/02 (2006.01) C09K 9/00 (2006.01)

Patent

CA 2386091

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.

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