| 摘要 |
PURPOSE:To enhance sensitivity and running properties by providing a water-soluble polymer layer containing inorg. pigment whose oil absorbancy is specific, wax and metal soap on a thermal color forming layer using calcium carbonate having specific oil absorbancy as pigment. CONSTITUTION:A water-soluble polymer layer containing inorg. pigment whose oil absorbancy due to a JIS method is 50ml/100g or more, wax and metal soap is provided on a thermal color forming layer containing an electron donating leuco dye, an electron acceptive compound, a compound represented by formula [I] (wherein R1 - R8 are a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom) and pigment. In this case, as the pigment of the thermal color forming layer, calcium carbonate whose oil absorbancy due to a JIS method is 60ml/100g or less is used. The compound represented by the formula [I] is high in pigment selectivity and can take out high sensitivity effect but the kind and use amount of the pigment in this thermal color forming layer are insufficient to keep running properties and fog is also easily generated. When the water-soluble polymer layer of the aforementioned composition is provided on the thermal color forming layer, running properties can be improved while the effect of the compound [I] is put to practical use. |
