| 摘要 |
PURPOSE:To enhance the color forming properties in a low energy region by adding a dibenzyl oxalate derivative finely divided in the presence of a salt of a styrene/maleic anhydride copolymer being a dispersant to a thermal recording layer. CONSTITUTION:When a salt of a styrene/maleic anhydride copolymer is used as a dispersant, a dibenzyl oxalate derivative is efficiently finely divided. When this finely divided dibenzyl oxalate derivative is used in a thermal recording layer as a heat meltable substance, a thermal recording material excellent in color forming properties especially in a low energy region is obtained. As the dibendyl oxalate derivative, dibenzyl oxalate, p-chlorobenzyl oxalate or p-methylbenzyl oxalate is designated but dibenzyl oxalate among them is especially pref. used because it has extremely excellent color forming properties in a low energy region. |
