A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A can be aminophenyl, indolyl, and benzoindolyl, substituted or not; B can be benzoindolyl, substituted or not; and E can be a broad family of aromatic and heterocyclic structures. The compound is eligible for use in pressure-sensitive record materials and manifold marking systems. Because of light absorption characteristics, selected compounds of this invention are especially useful where broad spectrum absorption and machine readability are important.
本发明揭示了一种通常为无色的显色化合物,其具有以下结构式:##STR1## 其中,A可以是
氨基苯基,
吲哚基和苯并
吲哚基,可以取代或不取代;B可以是苯并
吲哚基,可以取代或不取代;E可以是广泛的芳香族和杂环结构。该化合物适用于压敏记录材料和复写标记系统。由于其吸光特性,本发明的选定化合物在需要广谱吸收和机器可读性的情况下特别有用。