Accession Number : ADD018462

Title :   Reversible Thermochromic Pigments.

Descriptive Note : Patent, Filed 27 Jul 93, patented 2 Jan 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Novinson, Thomas

Report Date : 02 Jan 1996

Pagination or Media Count : 5

Abstract : A color changing pigment composition which changes color reversibly when heated comprising (a) a cyclic aryl lactone dye, (b) a diaminoalkane activator and (c)an 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.

Descriptors :   *PIGMENTS, *PATENTS, *THERMOCHROMIC MATERIALS, ALKANES, REVERSIBLE, ARYL RADICALS, DYES, ESTERS, BLUE(COLOR), TITANIUM DIOXIDE, WHITE(COLOR), YELLOW(COLOR), LACTONES

Subject Categories : Coatings, Colorants and Finishes
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE