This invention relates to improved imaging systems based on the formation of yellow colored coordination compounds of transition metals with certain ligands. The formation of colored coordination compounds can be employed to generate images and is important in the manufacture and use of pressure sensitive transfer papers for preparing carbonless copies. In particular, this invention relates to certain ethanediimidic acid bis[(arylalkylidene)hydrazide] compounds, and particularly to certain ethanediimidic acid bis[(o-hydroxyarylalkylidene)hydrazide] compounds, to their coordination compounds with certain transition metals, and to their use in pressure sensitive carbonless copy paper systems. These compounds have been found to provide excellent yellow colors when used in pressure sensitive carbonless copy-papers wherein the image is formed by the reaction of a color-forming compound with transition metal salts such as those of nickel, cobalt, iron, copper, and similar materials. These yellow color-formers have the advantage of greater solubility in encapsulation solvents and lower volatility than previously used yellow color-formers.
The invention also concerns the admixture of these certain color-formers with N-(monosubstituted)dithiooxamides and/or N,N′-(disubstituted)dithiooxamides to form images of various colors and preferably black images during the application of appropriate pressure to pressure sensitive imaging constructions such as carbonless paper constructions.
本发明涉及基于过渡
金属与某些
配体形成黄色配合物的改进成像系统。 形成彩色配合物可以用于生成图像,并且在制造和使用压敏转移纸以制备无
碳复写副本时非常重要。 特别是,本发明涉及某些乙二
酰亚胺二[(芳基烷基亚
甲基)
肼]化合物,特别是某些乙二
酰亚胺二[(o-羟基芳基烷基亚
甲基)
肼]化合物,它们与某些过渡
金属的配位化合物以及它们在压敏无
碳复写纸系统中的使用。 发现这些化合物在使用压敏无
碳复写纸时,与
镍,
钴,
铁,
铜和类似材料的过渡
金属盐反应形成的图像提供出色的黄色。 这些黄色色形成剂具有比先前使用的黄色色形成剂更大的封装溶剂溶解度和较低的挥发性的优点。本发明还涉及将这些某些色形成剂与N-(单取代)二
硫氧咪唑和/或N,N'-(双取代)二
硫氧咪唑混合以形成各种颜色的图像,最好是在施加适当压力于压敏成像结构(例如无
碳纸结构)时形成黑色图像。