| 摘要 |
There is provided a thermal transfer sheet including a thermal transfer dye layer formed on one surface of a base sheet and containing a dye and a heat resistant smooth layer formed on the other surface of the base sheet and containing a binder, a lubricant, and a filler. The binder contained in the heat resistant smooth layer is obtainable by mixing a polyvinyl acetoacetal resin with an acryl silicone resin which has a mass average molecular weight of 100,000 or more and is in the form of a powdery solid at an ordinary temperature at a ratio of 10 parts by mass or less of the acryl silicone resin relative to 100 parts by mass of the polyvinyl acetoacetal resin, and the heat resistant smooth layer further contains 10 parts by mass or more and 30 parts by mass or less of isocyanate relative to 100 parts by mass of the polyvinyl acetoacetal resin and phosphoric acid ester having a melting point of 50° C. or more as the lubricant.
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