Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1991-02-11
1993-05-11
Hess, B. Hamilton
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
428195, 428913, 428914, B41M 5035, B41M 538
Patent
active
052100677
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat transfer image-receiving sheet and, more particularly, to a heat transfer image-receiving sheet capable of making image representations excelling in various fastness properties, especially light fastness.
BACKGROUND TECHNIQUE
Among various heat transfer techniques so far known in the art, there is proposed a sublimation type of transfer system wherein a sublimable dye as a recording material is carried on a substrate sheet such as paper or a plastic film to make a heat transfer sheet, which is in turn overlaid on a heat transfer sheet dyeable with a sublimable dye, for instance, a heat transfer sheet comprising paper or a plastic film having a dye-receiving layer on its surface to make various full-color images thereon. In this system, the thermal head of a printer is used as heating means to transfer three-, four- or more-color dots by a very quick heating, thereby reconstructing a full-color image of the original by the multi-color dots.
Because the coloring material used is a dye, the thus formed image is so clear and so excellent in transparency that the resulting image representation can be improved in the reproducibility of halftone and gray scale. This makes it possible to form image representations similar to those achieved with conventional offset or gravure printing and comparable in quality to full-color photographic images.
A problem with the thus obtained image representations, however, is that because of being formed of a dye, they are generally so inferior in light fastness to pigmented images upon being exposed directly to sunlight, they fade or discolor prematurely. Some solution to such a light fastness problem may be provided by adding ultraviolet absorbers or antioxidants to the dye-receiving layers of heat transfer image-receiving sheets. Yet image storability presents an important problem to be solved.
DISCLOSURE OF THE INVENTION
It is, therefore, an object of this invention to provide a heat transfer image-receiving sheet designed to be used with heat transfer systems making use of sublimable dyes to make clearer image representations which are of sufficient density and show more improved fastness properties, especially more improved light fastness.
The above-mentioned object is achieved by the present invention to be hereinafter described.
More specifically, one aspect of this invention relates to a heat transfer image-receiving sheet comprising a substrate sheet and a dye-receiving layer formed on at least one surface of the substrate sheet, characterized in that the dye-receiving layer is composed of a resin containing an antioxidant expressed by the following structural formula (I). ##STR2## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or a substituted or unsubstituted alkyl group.
According to another aspect of this invention, there is provided a heat transfer image-receiving sheet comprising a substrate sheet and a dye-receiving layer formed on at least one surface of said substrate sheet, characterized in that the dye-receiving sheet is composed of a dye containing an antioxidant expressed by the following structural formula (II): ##STR3## wherein R.sub.1 and R.sub.2 each represent a substituted or unsubstituted alkyl group.
By allowing each of the aforesaid specific antioxidants to be contained in a dye-receiving layer, it is possible to provide a heat transfer image-receiving sheet which, when used with heat transfer systems making use of sublimable dyes, forms clearer image representations of sufficient den and showing more improved fastness properties, especially more improved light fastness.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will now be explained in greater detail with reference to some preferred embodiments.
The heat transfer image-receiving sheet according to this invention comprises a substrate sheet and a dye-receiving layer formed on at least one surface thereof.
No limitation is placed on substrate sheets used in this invention. For instance, use may be made
REFERENCES:
patent: 4855281 (1989-08-01), Byers
patent: 5013711 (1991-05-01), Egashira et al.
Egashira Noritaka
Shimizu Osamu
Dai Nippon Insatsu Kabushiki Kaisha
Hess B. Hamilton
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