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):

Report Date:

1996-01-02

Pagination or Media Count:

5.0

Abstract:

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.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE