Lundi 26 novembre 2007
Lors de mon dernier poste chez AIC-Sun Chemical, j'ai notamment travaillé sur la recherche de nouveaux systèmes colorants innovants et utilisables dans le packaging et
l'impresion.
Mon dernier brevet vient de sortir: il concerne le développement d'un système piezochrome reversible: US2007259286
The present invention provides a reversible piezochromic system that gives high contrast images upon an application of pressure to the system. The system has a short color-reversal time and can be prepared inexpensively by admixing a suitable electron donating compound and a suitable electron accepting compound. The reversible piezochromic systems of the present invention are useful for preparing a printing ink that can be used to print, for example, banknotes, to prevent forgeries.
Le précedent, publié en juillet dernier, concerne un procédé pour réaliser un système thermochromique reversible de l'incolore à la couleur en montée de température ( habituellement, c'est l'inverse : la couleur disparait en montéee de température): US2007167325
The present invention provides a reversible piezochromic system that gives high contrast images upon an application of pressure to the system. The system has a short color-reversal time and can be prepared inexpensively by admixing a suitable electron donating compound and a suitable electron accepting compound. The reversible piezochromic systems of the present invention are useful for preparing a printing ink that can be used to print, for example, banknotes, to prevent forgeries.
Le précedent, publié en juillet dernier, concerne un procédé pour réaliser un système thermochromique reversible de l'incolore à la couleur en montée de température ( habituellement, c'est l'inverse : la couleur disparait en montéee de température): US2007167325
The present invention provides a reversible thermochromic system that is a two-component system based on an electron donating compound (color former) and
an electron accepting compound (developer). A temperature increase to the melting point of the developer causes the system to change from a colorless state to a colored state and a temperature
drop below the recrystallization temperature of the developer causes the system to change from the colored state to the colorless state. The thermochromic system of the present invention is
applicable to various types of inks, such as a flexographic printing ink, a screen printing ink, a lithographic printing ink, and an intaglio printing ink. The invention also provides a method
for preparing the thermochromic system of the present invention.
Bien que loin de l'énergie renouvelable, les systèmes que j'ai mis au point dans ces brevets appartiennent à la famille de ceux utilisés dans les cellules
solaires de Graetzel ( DSC : Dye sensitized Solar Cell) !!
