| 摘要 |
PURPOSE:To provide a thermal recording material improved in the fading of a recording image at high temp. or under a high temp. condition by adding at least one kind of a specific compound. CONSTITUTION:A compound represented by formula I (wherein R is a hydrogen atom, a lower alkyl group or a halogen atom and X is an oxygen atom or a sulfor atom) can be easily synthesized with high efficiency by reacting 1,3,5- triacryloylhexahydro-S-triazine and three equivalents of a dihydroxybenzene derivative or a mercaptophenol derivative in an inert solvent such as pyridine in the presence of a small amount of an alkali catalyst such as sodium methylate. A thermal recording material is prepared by applying a coating solution containing respective components for forming a thermal color forming layer to a proper support such as paper, synthetic paper or a plastic film and drying the coating layer. The proper use amounts of a leuco dye, a coupler and a sensitivity enhancer are respectively 5-40wt.%, 20-60wt.% and 20-60wt.%. This thermal recording material is reduced in the fading of a recording image even at high temp. and excellent in preservability and suitable for high speed recording. |
