Certain types of aryl nitrogen compound are found to be useful not only for effectively rendering dyes lightfast but also for using as an additive that has high solubility in solvents and sufficiently good miscibility with dyes to insure that their solubility will not be impaired. They can be used for preventing various reactions that cause deterioration by light in organic dyes, in particular cyanine dyes. They can also be used for improving the keeping quality and recording and reproduction characeristics of optical recording media that use organic dyes in the form of thin films. Representative examples include N, N-lower alkyl substituted nitrosoanilines, phenol or naphthol derivatives having at least one nitroso group, nitrosodiphenylamine and its derivatives and 1-picryl-2, 2-diarylhydrazyl free radicals.
我们发现某些类型的芳基氮化合物不仅可以有效地提高
染料的耐光性,还可以用作一种添加剂,这种添加剂在溶剂中的溶解度很高,与
染料的混溶性也很好,可以确保
染料的溶解度不受影响。它们可用于防止有机
染料(尤其是
氰基
染料)因光照而引起的各种变质反应。它们还可用于改善以薄膜形式使用有机
染料的光学记录介质的保存质量以及记录和复制特性。具有代表性的例子包括 N,N-低级烷基取代的
亚硝基苯胺、具有至少一个亚硝基基团的
苯酚或
萘酚衍
生物、亚硝基
二苯胺及其衍
生物和 1-苦基-2,2-二酰
肼自由基。