Heat-sensitive transfer recording medium

A heat-sensitive transfer recording medium comprising a base material, a heat-resistant slippage layer formed on one surface of the base material, and an undercoating layer and a dye layer sequentially laminated and formed on the other surface of the base material, wherein:

• the undercoating layer is formed by applying and then drying an undercoating layer-forming application liquid containing polyvinyl pyrrolidone and polyvinyl alcohol whose tensile strength measured based on JIS K 7113 is not lower than 8 kg/mm2;
• the dye layer is formed by applying and then drying a dye layer-forming application liquid containing an anthraquinone compound as a thermal migratory dye;
• an average value α of surface roughness (Ra) of the heat-resistant slippage layer is 0.05 to 0.50 μm, and an average value β of surface roughness (Ra) of the heat-resistant slippage layer after being left still at 150° C. for 10 minutes is 0.00 to 0.80 μm;
• and
• a difference between the average value α and the average value β is 0.00 to 0.30 μm.

A heat-sensitive transfer recording medium for forming an image through thermal transfer on a thermal transfer image-receiving sheet that has an aqueous-receiving layer containing an aqueous binder and a mold releasing agent and being formed on a base material via an aqueous hallow particle layer containing an aqueous binder and hollow particles, the heat-sensitive transfer recording medium comprising

• a base material, and an undercoating layer and a dye layer sequentially laminated and formed on the base material, wherein:
• the undercoating layer is formed by applying and then drying an undercoating layer-forming application liquid containing polyvinyl pyrrolidone and polyvinyl alcohol whose tensile strength measured based on JIS K 7113 is not lower than 8 kg/mm2;
• the dye layer is formed by applying and then drying a dye layer-forming application liquid containing filler particles and an anthraquinone compound as a thermal migratory dye;
• and
• a three-dimensional surface roughness (SRa) of the dye layer is 0.15 to 0.70 μm.

A heat-sensitive transfer recording medium for forming an image through thermal transfer on a thermal transfer image-receiving sheet that has an aqueous-receiving layer containing an aqueous binder and a mold releasing agent and being formed on a base material via an aqueous hallow particle layer containing an aqueous binder and hollow particles, the heat-sensitive transfer recording medium comprising

• a base material, and an undercoating layer and dye layers sequentially laminated and formed on the base material, wherein:
• the undercoating layer is formed by applying and then drying an undercoating layer-forming application liquid containing polyvinyl pyrrolidone and polyvinyl alcohol whose tensile strength measured based on JIS K 7113 is not lower than 8 kg/mm2;
• at least one of the dye layers is formed by applying and then drying a dye layer-forming application liquid containing at least two types of modified silicone oils as mold releasing agents, and an anthraquinone compound as a thermal migratory dye;
• and
• the modified silicone oils include a nonreactive silicone oil whose number average molecular weight is not smaller than 8000, and a reactive silicone oil whose number average molecular weight is not larger than 3000.