申请人:APPLETON PAPERS INC.
公开号:EP0550140A1
公开(公告)日:1993-07-07
Novel chromogenic mono(indolylethylenyl)phthalides are of the formula
wherein A is a moiety of the type
L is an indole moiety; and
B is a moiety of the type
The compounds are prepared by condensing indolylethylene with a keto acid or its derivative and an electron acceptor in an organic solvent, and are useful in pressure-sensitive and thermal recording systems, particularly those which can be read by a machine capable of reading in the wavelength range 400 to 900 nm.
新颖的发色性单(吲哚乙烯基)邻苯二甲酸酯的结构式为
其中 A 是以下类型的分子
L 是一个吲哚分子;以及
B 是以下类型的分子
这些化合物是通过在有机溶剂中将吲哚乙烯与酮酸或其衍生物和电子受体缩合而制备的,可用于压敏和热敏记录系统,特别是可由波长范围为 400 至 900 纳米的机器读取的系统。