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| Thermal transfer printing |
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| Thermal transfer printing |
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| Thermal transfer sheet |
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Thermal image transfer recording system
| Details |
Inventors: Uemura, Hiroyuki; Suzuki, Akira; Shimada, Masaru; Mochizuki, Hidehiro; Morohoshi, Naoya;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A thermal image transfer recording system comprises a sublimation type thermal image transfer recording medium in combination with an image receiving medium comprising a substrate and a dye receiving layer formed thereon, which comprises, as the principal components, (1) a vinyl chloride-based resin containing active hydrogens and (2) an isocyanate compound. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The image receiving medium for use in the present invention comprises a substrate and a dye receiving layer formed thereon, the dye receiving layer comprising as the principal components a vinyl chloride-based resin containing active hydrogens, and an isocyanate compound.
The vinyl chloride-based resin imparts high dye-receptivity, releasability, light-resistance and preservability to the image receiving medium.
Furthermore, the vinyl chloride-based resin is hardened when reacted with the isocyanate compound, so that the releasability of the dye receiving layer from a sublimation type thermal transfer recording medium is improved.
In the present invention, it is preferable to further incorporate a polyester resin into the dye receiving layer.
This is because the polyester resin can also impart the dye-receptivity, releasability, light-resistance and preservability to the image receiving medium.
In this case, the amount of the polyester resin is 50 to 100 parts by weight per 100 parts by weight of the vinyl chloride-based resin containing active hydrogens.
Examples of the vinyl chloride-based resin containing active hydrogens for use in the present invention include vinyl chloride-vinyl acetate copolymers modified with polyvinyl alcohol.
Commercially available products of such copolymers are, for example, "VAGH" and "VROH" (Trademarks) made by Union Carbide Japan K.
K.
; and "Denka Vinyl 1000GKT", "Denka Vinyl 1000GK" and "Denka Vinyl 1000GKS" (Trademarks) made by Denki Kagaku Kogyo K.
K.
Examples of the isocyanate compound for use in the present invention include tolylene diisocyanate, hexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, triphenylmethane triisocyanate, and addition products of hexatriol with the above compounds.
It is preferable that the vinyl chloride-based resin containing active hydrogens and the isocyanate compound be employed in such an amount ratio that the molar ratio of the NCO groups in the isocyanate compound to the groups having an active hydrogen, such as an OH group and a COOH group, in the vinyl chloride-based resin, is 0
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