A diazonium salt for a color-forming layer of a thermosensitive recording medium. This diazonium salt has the following formula (1) or (2)
wherein R is an alkyl group having two or more carbon atoms such as t-butyl or sec-butyl, and X- is selected from the group consisting of hexafluorophosphate ion PF6-, tetrafluoroborate ion BF4- and tetraphenylborate ion (C6H5)4B-.
where R1 and R2 are alkyl groups each having one or more carbon atoms, and X- is selected from the group consisting of hexafluorophosphate ion PF6-, tetrafluoroborate ion BF4- and tetraphenylborate ion (C6H5)4B-.
一种用于热敏记录介质显色层的重氮盐。这种重氮盐具有下式 (1) 或 (2)
其中 R 是具有两个或两个以上碳原子的烷基,如叔丁基或仲丁基,X- 选自
六氟磷酸盐离子 PF6-、四
氟硼酸盐离子
BF4- 和四苯基
硼酸盐离子 (
C6H5)4B- 组成的组。
其中 R1 和 R2 为各自具有一个或多个碳原子的烷基,X- 选自
六氟磷酸根离子 PF6-、四
氟硼酸根离子 -和四苯基
硼酸根离子 ( )4B- 组成的组。