Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1988-04-11
1990-03-13
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
8471, 428195, 428480, 428913, 428914, B41M 5035, B41M 526
Patent
active
049083457
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a dye receiving sheet, i.e., a sheet to be heat transfer printed, which is to be used for image formation according to the sublimation transfer method, more particularly to a dye receiving sheet of excellent dye dyeability and/or light resistance (weathering resistance) of transferred image to be used in combination with a heat transfer sheet.
Attempts are being made to heat a heat transfer sheet having a dye layer containing sublimable disperse dye formed thereon in dot shapes corresponding to image signals by a heating printing means such as a thermal head and form an image comprising the dye migrated from the above heat transfer sheet on the surface of a dye receiving sheet.
However, in the heat dye receiving of the prior art, dyeability of the dye is not necessarily sufficiently good, and when an image with high density is desired, a correspondingly excessive heat content is required during printing. For this reason the energy load on the thermal head is inevitably increased, whereby the thermal head driving voltage becomes undesirably great.
Also, in the dye receiving sheet of the prior art, light resistance and weathering resistance of the image formed have not been sufficient, and sharpness of the image once formed can be lowered or discolored with time. This may be considered to be because of the existence of the dye migrated from the heat transfer sheet side by the thermal head, etc. in the vicinity of the surface of the receiving layer of the heat transfer sheet, which particularly affects susceptibility to light or humidity.
SUMMARY OF THE INVENTION
Accordingly, in the present invention, it is an object to improve the dyeability of dyes by eliminating the drawbacks of the above dye receiving sheet of the prior art and/or to improve light resistance (and weathering resistance) of the image formed by migration of dyes.
The present inventors have undertaken intensive studies in order to ameliorate the above dyeability and light resistance (weathering resistance) which are particularly problems in the performances of dye receiving sheets and consequently found that the above characteristics can be remarkably improved by forming the receiving layer of the dye receiving sheet by the use of a modified polyester obtained by introducing a specific group into a polyester resin.
More specifically, the dye receiving sheet is a sheet to be used in combination with a heat transfer sheet having a dye layer containing a dye which is migrated by fusion or sublimation by heat, comprising (a) a sheet substrate and (b) a receiving layer formed on at least one surface of the sheet substrate for receiving the dye migrating from said heat transfer sheet during heating printing, characterized in that said receiving layer comprises a modified polyester resin.
In the present invention, the above modified polyester resin comprises specifically a phenyl group modified polyester resin synthesized by use of a polyol having a phenyl group as the polyol component and/or a long chain methylene group modified polyester resin synthesized by use of a dicarboxylic acid having a long methylene group as the acid component.
Of the above modified polyester resins, the phenyl group modified polyester resin has excellent effect in improvement of dye dyeability, while the long chain methylene group modified polyester resin exhibits excellent effect in improvement of light resistance (weathering resistance).
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 and FIG. 2 are sectional views of heat transferable sheets according to Examples of the present invention, respectively; and
FIG. 3 is a graph of the optical reflective density versus applied energy.
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the dye receiving sheet 1 according to the present invention has a receiving layer 3 for receiving the dye migrating from the heat transfer sheet during heating printing formed on the surface of a sheet substrate 2. Also, in the dye receiving sheet of the present invention, an in
REFERENCES:
patent: 4097230 (1978-06-01), Sandhu
Arita Hitoshi
Egashira Noritaka
Dai Nippon Insatsu Kabushiki Kaisha
Hess Bruce H.
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