THERMOCHROMIC MATERIALS

摘要

A reversible thermochromic material, preferably in the form of a microcapsule, comprising: (a) an electron donative color former; (b) a sulfide, sulfoxide or sulfone containing a hydroxy phenyl radical; and (c) a chemical compound selected from alcohols, esters, ethers, ketones, carboxylic acids or acid amides, chromatizes very brightly and in a dense color, generates a change of chromic hue (colored - colorless) within a narrow temperature range and provides a stable thermochromatism on a long term basis.