| 摘要 |
PURPOSE:To enhance the preservability of a sheet itself and dye transfer properties by forming an ink layer containing a polyvinyl acetoacetal resin, a polyvinyl butyral resin and a heat-diffusible dye on a support. CONSTITUTION:As the binder of an ink layer, a polyvinyl acetoacetal resin and a polyvinyl butyral resin are used. The degree of polymerization of the polyvinyl acetoacetal resin and the polyvinyl butyral resin is pref. 1500 or more and the ratio of the polyvinyl acetoacetal resin and the polyvinyl butyral resin is usually 10:90-90:10, pref., 40:60-90:10. The wt. ratio of the binder and the heat-diffusible dye is pref. 1:10 10:1, especially pref., 2:8-8:2. The wt. ratio of the polyvinyl acetoacetal resin and/or polyvinyl butyral resin and other resin is usually 100:0-50:50, pref., 90:10-60:40. |
