Reversible Thermochromic Pigments.
Patent, Filed 27 Jul 93, patented 2 Jan 96,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A color changing pigment composition which changes color reversibly when heated comprising a a cyclic aryl lactone dye, b a diaminoalkane activator and can ester. The pigment composition can also include a white pigment such as titanium dioxide as an opacifier or a yellow dye such Hansa yellow G. The pigment composition changes from a dark color, e.g. blue, to white when the composition is heated to a specified temperature, e.g. to a temperature of 52 deg C, and reversibly changes from white back to the blue color when the pigment composition is cooled, e.g. to a temperature below about 25 deg C.
- Coatings, Colorants and Finishes