| 摘要 |
PURPOSE:To enhance adhesion between a thermal color forming layer and a vapor-deposited aluminum layer and water resistance of the color forming layer and contrive favorable color forming sensitivity and image preservability, by using polyvinyl alcohol or modified polyvinyl alcohol in combination with dialdehydostarch and casein, as a binder in a thermal color forming layer. CONSTITUTION:Polyvinyl alcohol or modified polyvinyl alcohol is used in combination with dialdehydostarch or casein as a binder in a thermal color forming layer, in a copying sheet for thermal recording which is provided with a vapor- deposited aluminum layer and a thermal color forming layer sequentially on one side of a paper or a resin film and with a heat-fusible ink layer on the other side. The amounts of polyvinyl alcohol or modified polyvinyl alcohol, dialdehydostarch and casein are suitably 5-50%, 5-80% and 2-20%, respectively, based on the amount of solid component of the thermal color forming layer. The copying sheet for thermal recording thus obtained had favorable water resistance of the thermal color forming layer and favorable adhesion of the layer to the vapor-deposited aluminum layer, and showed extremely favorable printability. |
