Thermal transfer (printing) film

Claim 1

A thermal transfer printing film comprising: (a) a base film, (b) a stick-preventing layer provided on one side of said base film, said stick-preventing layer being provided at a rate of 0.01 to 1.9 g/m 2 on one side of said base film, the center line average roughness of the surface of said stick-preventing layer being 0.03 to 0.15 μm, the coefficient of parallel slipping of said stick preventive layer against a glass surface being not more than 1.0, the tensile strength of the film formed with said stick-preventing layer on one side thereof bering not less than 8 kgf/mm 2 when said film was elongated by 5% in the longitudinal direction, and said stick-preventing layer being a cured or dried coating film mainly composed of one or more alkoxysilane hydrolyzates produced by hydrolyzing an alkoxysilane represented by the following formula: ##STR3## wherein R 1 and R 2 each represent substituted or unsubstituted monovalent hydrocarbon groups of an alkyl group, cycloalkyl group, alkenyl group, aryl group, aralkyl group or those groups in which hydrogen atoms thereof are partly substituted with other substituents being a mercapto group, glycidoxyl group, methacryloxyl group, amino group; and R 3 represents an alkyl group, and (c) a heat-melting ink layer provided on the other side of said base film.