Provided is a microcapsule color material prepared by using a leuco dye, wherein the microcapsule color material is increased in a freedom of material selection in selecting a discoloring temperature controller and expanded in a freedom of setting in setting an amount thereof in the microcapsule color material prepared by using the leuco dye, and it attempts to be reduced in a load of manufacturing and improved in a diversification in thermal discoloration and can be further raised in a utilization of a microcapsule color material, and further provided is an ink composition for writing instruments containing the above microcapsule color material.
The microcapsule color material is characterized by containing at least a leuco dye, a developer and a discoloring temperature controller represented by the following Formula (I) :
(wherein R1 and R2 represent an alkyl group having 7 to 21 carbon atoms, and R3 represents a hydrogen atom or an alkyl group having 1 to 7 carbon atoms).
本发明提供了一种使用白兰地
染料制备的微胶囊色素材料,其中,在使用白兰地
染料制备的微胶囊色素材料中,在选择变色温度控制器的材料选择自由度方面增加了微胶囊色素材料,在设定其用量的设定自由度方面扩大了微胶囊色素材料、此外,还提供了一种含有上述微胶囊色素材料的书写工具墨
水组合物。
微胶囊色料的特点是至少含有一种白兰地
染料、一种显影剂和一种变色温度控制器,由下式(I)表示:
(其中 R1 和 R2 代表具有 7 至 21 个碳原子的烷基,R3 代表氢原子或具有 1 至 7 个碳原子的烷基)。