Heat printing sheet and heat printing method

A heat printing sheet which is prepared by the process consisting essential of

• a. melting a hot melt ink at a temperature of 80.degree.-250.degree. C;
• b. coating said hot melt ink on an engraved roll and instantaneously printing said hot melt ink on a synthetic polymer
• film having a thickness of 10-100.mu. and a smooth surface under a gauge pressure of 0.5-10 Kg/cm.sup.2 to form a pattern of hot melt ink having a thickness of 10-300.mu.;
• wherein said hot melt ink composition comprises:
• - 60weight parts of a base polymer of an ethylenevinyl acetate copolymer having 5-50 weight percent of the vinyl acetate content and 4-1000 g/10 min. of a melt index or a mixture of said ethylene-vinyl acetate and 5-60 weight percent of at least one member selected from the group consisting of styrene-butadiene copolymer, ethylene-acrylate copolymer, ethylene-isobutyl acrylate copolymer, cellulose derivatives, polyesters, polymethylmethacrylate;
• polyvinyl ethers and urethane;
• 20-80 weight parts of a tackifier selected from terpene resins, hydrogenated dicyclopentadiene resins, lower styrene resins, rosins, rosin polyol esters, hydrogenated rosin and rosin polyol esters and alicyclic hydrocarbon resins;
• 0.1-30 weight parts of a pigment or dye.