Patent ID: 6494950
Filing Date: 2002-12-17
Classification: B41M,C09B,C09K,Y10S,Y10T

Abstract:
A thermochromic microencapsulated pigment which comprises as four essential components (a) an electron-donating chromatic organic compound, (b) an electron-accepting compound, (c) a reaction medium determining temperatures at which color reactions of component (a) with component (b) take place and being selected from the group consisting of sulfides, ethers, ketones, esters, and acid amides, and (d) a color change temperature regulator, said color change temperature regulator (d) comprising one or more compounds selected from the group consisting of esters, alcohols, ketones, acid amides, hydrocarbons, and fatty acids, and contained in an amount of from 0.01 to 0.3 part by weight per part by weight of the reaction medium (c) and having a melting point Y (Â° C.) satisfying the relationship (X+30)Â° C.&lE;Y&lE;200Â° C., wherein X (Â° C.) is the melting point of component (c), and said four essential components being microencapsulated.