Thermal transfer recording medium and photographic print
View Patent ↗A thermal transfer recording medium 1 according to the present invention is to obtain a reliable printed matter with no space between picture information and a protective film thereof and has a melting type transfer portion 16 1 including a melting type primer layer 18 1 whose main component is styrene vinyl acetate copolymer and a melting type ink layer 17 1 . Since styrene vinyl acetate copolymer softens or melts by heating to lose mechanical strength thereof, the melting type transfer portion 16 1 is transferred with ease from a base sheet 11 by heating to form a printing layer 47 . On the surface of the printing layer 47 , a residual resin 49 formed of material of the melting type primer layer 18 1 is exposed; however, since styrene vinyl acetate copolymer sticks well to a thermoplastic resin existing on the surface portion of a protective portion 25 1 , there is no space generated between the protective portion 25 1 and the printing layer 47.
1. A thermal transfer recording medium comprising a base sheet, a melting primer layer disposed on said base sheet, a sublimation transfer portion which is disposed on said base sheet and contains sublimation type ink, and a melting ink layer disposed on said melting primer layer, in which
said melting primer layer and said melting ink layer constitute a melting transfer portion,
said melting transfer portion is transferred to a printing object when heating said melting transfer portion,
and a printing layer where a residual resin made of said primer layer material is exposed is formed;
wherein said melting primer layer is comprised of a styrene vinyl acetate copolymer of at least 60 wt %; and
wherein when said sublimation transfer portion is heated in the state of being firmly in contact with said printing object, said sublimation ink sublimates and infiltrates into said printing object.
2. A thermal transfer recording medium according to claim 1 , wherein said melting ink layer is formed of black ink containing carbon black which is a coloring agent.
3. A thermal transfer recording medium according to claim 1 , wherein said styrene vinyl acetate copolymer contained in said melting primer layer is comprised of vinyl acetate of 10 mol % or more and 50 mol % or less.
4. A thermal transfer recording medium according to claim 1 , wherein polyethylene wax is added to said melting primer layer.
5. A thermal transfer recording medium according to claim 1 , further comprising a protective portion disposed on said base sheet, wherein when said protective portion is heated, a surface portion of said protective portion becomes adhesive with respect to said residual resin.
6. A thermal transfer recording medium according to claim 5 , wherein said protective portion contains one kind of resin selected from a group consisting of acrylic resin, polyester resin, vinyl chloride resin, nitrocellulose resin and urethane resin.