Patent ID: 11814528

Abstract:
There is a compound represented by the following formula (I): in which R1 and R2, identical or different, represent a C2-C30 alkyl group, a C2-C30 alkenyl group, a C2-C30 alkynyl group, or a C2-C30 alkoxy group, the alkyl, alkenyl, alkynyl, or alkoxy groups being optionally substituted with at least one hydroxy, halogen, amino, C1-C8 alkyl, or C1-C8 alkoxy group, as a temperature change regulating agent in a thermochromic ink composition. There also are thermochromic pigment microcapsules having a compound of formula (I) according to the disclosure, to ink compositions having such thermochromic pigment microcapsules, and to writing instruments comprising such ink compositions.