REVERSIBLE THERMOCHROMIC COMPOSITION, REVERSIBLE THERMOCHROMIC MICROCAPSULE PIGMENT COMPRISING SAME, AND WRITING INSTRUMENT USING SAME
申请人:THE PILOT INK CO., LTD.
公开号:EP3950068A1
公开(公告)日:2022-02-09
[Problems] Provided are a highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same.
[Solution] Disclosed are a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.
[问题]提供了一种极具市场前景的可逆热致变色组合物,该组合物通过使用具有特定结构的芴衍生物作为电子捐赠显色有机化合物,在显色过程中提供黑色,在脱色过程中变成无色,并且在有色状态和脱色状态之间具有极佳的对比度,同时还提供了封装该组合物的微胶囊颜料。
[解决方案]本发明公开了一种可逆热变色组合物,包括:(a)具有特定结构的氟烷衍生物,作为电子捐赠显色有机化合物;(b)电子接受化合物;以及(c)反应介质,该介质可在特定温度范围内可逆地诱导组分(a)和组分(b)之间的电子转移反应,以及封装该组合物的可逆热变色微胶囊颜料。