Patent ID: 7833938

Claim:
A thermal-transfer sheet having a substrate film, a transfer ink layer formed on one face thereof, and a back layer formed on the other face thereof, the back layer comprising: a binder containing a polyamide-imide resin (A) having a Tg of 200° C. or higher and a polyamide-imide silicone resin (B) having a Tg of 200° C. or higher, as determined by differential thermal analysis, a mixture of a polyvalent metal salt (C) of alkylphosphoric ester and a metal salt (D) of alkylcarboxylic acid, a silicone oil (E) in an amount of 1 to 30 parts with respect to 100 parts by mass of the binder, and an inorganic filler (F) containing fine particles (F 1 ) of an inorganic material having a Mohs' hardness of 3 or less alone or a mixture of fine particles (F 1 ) of an inorganic material and fine particles (F 2 ) of an inorganic material having a Mohs' hardness of more than 3, the metal salts (C) and (D) having an average particle size of 5 μm to 20 μm and the inorganic filler (F) having an average particle size of 0.05 to 5.5 μm.