A fluoran compound of the formula:
wherein R1 is C3-C13 secondary alkyl with respect to the carbon atom bonded to the nitrogen atpm, R2 is C1-C4 primary alkyl, C3-C4 alkenyl or C3-C4 alkoxyalkyl, R3 and R4 are, same or different, hydrogen, halogen, C1-C4 alkyl or trifluoromethyl, R5 is hydrogen, methyl, ethyl or halogen, which is useful as a color former and develops deep black with a developer.
一种氟烷化合物,其式如下
其中 R1 是 C3-C13 仲烷基(相对于与氮键合的碳原子而言),R2 是 C1-C4 伯烷基、C3-C4 烯基或 C3-C4 烷氧基烷基,R3 和 R4 是相同或不同的氢、卤素、C1-C4 烷基或三
氟甲基,R5 是氢、甲基、乙基或卤素,可用作
显色剂,用
显色剂显深黑色。