| 摘要 |
NEW MATERIAL:1,5-Di(4-hydroxyphenylthio)-3-oxapentane of formula. USE:A color developing agent. It has low melting point compared with bisphenol A, and is useful as a color developer having high thermal sensitivity and suitable for high-speed recording. The thermal recording material containing said compound has excellent stability of developed color and high-speed color developability, and free from the defects of fading of colored part with time. PROCESS:The compound of formula can be prepared by reacting a monothiohydroquinone with corresponding dihalogenoalkyl ether under alkaline condition. Since the thermal recording material containing said compound can be manufactured without using a sensitizer nor a melting point depressing agent, it has especially excellent thermal response and gives a clear image at a high sensitivity. It does not develop fog even at high temperature and humidity, and keeps the contrast of the image. It is free of phenolic smell. |
