スチルベンケイ光増白剤のセロファンフィルム上における光退色

ケイ光増白剤に関する研究 (第7報)

抄録

The photofading behaviors of the fluorescent whitening agents (F.W.A.) on cellophane film were examined by both spectrophotometry and thin-layer chromatography. F.W.A. examined were four types of N, N'-disubstituted 4, 4'-diamino-stilbene-2, 2'-disulfonates ; benzoylamino type (B) phenylureido type (U), triazinylamino type (D), and triazolyl type (T).
It was found that there were two steps in photofading; the rapid fading step and the slower fading step. The rate of the rapid fading step varied depending on the types of F.W.A. in order U>D>B ≥T. It was confirmed that the rapid photofading in the case of B or U type of F.W.A. is mainly attributable to the trans.→ cis photoisomerization.