Disclosed are normally substantially colorless chromogenic oxime ether of Michler's hydrol color precursor compounds having the following generic structural formula: ##STR1## wherein R.sub.1 and R.sub.2 each represents an organic radical. More specifically, R.sub.1 may represent either a lower alkyl group having from one to five carbon atoms or a phenyl group and R.sub.2 may represent a substituted or unsubstituted phenyl group having the following formula: ##STR2## wherein R.sub.3 and R.sub.4 each separately represents either a hydrogen atom, a chlorine atom or a nitro group. These compounds are initially substantially colorless and are capable of becoming highly colored when brought into reactive contact with many conventional Lewis acid materials or the like. Accordingly, these compounds are highly useful as a component of pressuresensitive copying papers.
公开了一种通常基本无色的米勒氢醇颜色前体化合物的氧
肟醚染色剂,其具有以下通用结构式: ##STR1## 其中R.sub.1和R.sub.2分别代表有机基团。更具体地,R.sub.1可以表示具有从一到五个碳原子的低烷基或苯基,而R.sub.2可以表示具有以下公式的取代或未取代苯基: ##STR2## 其中R.sub.3和R.sub.4分别单独表示氢原子、
氯原子或硝基。这些化合物最初基本无色,并且在与许多传统的Lewis酸材料或类似材料发生反应接触后能够变得高度着色。因此,这些化合物作为压敏复写纸的组分非常有用。