Heat transfer image-receiving sheet and heat transfer process

Details Heat transfer image-receiving sheet and heat transfer process Heat transfer image-receiving sheet and heat transfer process

1990-06-21

1992-07-07

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

Having plural interactive leaves

428195, 428480, 428500, 428913, 428914, B41M 5035, B41M 526

Patent

active

051283115

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a heat transfer image-receiving sheet and a heat transfer process. More particularly, the present invention relates to a heat transfer image-receiving sheet which can form thereon a recorded image having excellent color density, sharpness and fastness characteristics, and a heat transfer process.
2. Background Art
Various heat transfer methods have been known. Among these methods, there has been practically adopted a sublimation transfer process in which a heat transfer sheet formed by supporting a sublimable dye as a recording material on a substrate sheet such as a paper sheet is piled on a receiving material dyeable with the sublimable dye, for example, a polyester woven fabric, and heat energy is applied to an image to the assembly from the back surface of the heat transfer sheet to transfer the sublimable dye to the receiving material.
In this sublimation transfer process, in case of the sublimation transfer printing using a polyester woven fabric or the like as the receiving material, since the application of heat energy is conducted for a relatively long time, the heat transfer sheet is sufficiently heated and the receiving material per se is heated by the applied heat energy, and therefore, relatively good transfer of the dye can be accomplished.
However, with the recent development of recording techniques, there is often adopted a method in which a receiving material comprising a dye-receiving layer formed on a polyester sheet or paper is used and a fine letter or pattern or a photographic image is formed on the receiving material at a high speed by using a thermal head or the like. In this method, it is required that the time for the application of heat energy should be very short and shorter than the time expressed in seconds. Since the sublimable dye and the receiving material are not sufficiently heated if the application of heat energy is conducted only for such a short time, an image having a sufficient density cannot be obtained.
A sublimable dye having excellent subliming characteristics has been developed as the dye capable of coping with this high speed recording. In general, however, a dye having excellent subliming characteristics has a low molecular weight, and therefore, after the transfer, the dye tends to migrate into the receiving material with the lapse of time or to bleed out to the surface, with the result that the formed image is disturbed or becomes obscure and the problem of contamination of a surrounding article arises.
If a sublimable dye having a relatively high molecular weight is used for avoiding these disadvantages, in the above-mentioned high-speed recording method, since the sublimation speed is low, an image having a satisfactory density cannot be obtained.


DISCLOSURE OF THE INVENTION

It is therefore a primary object of the present invention to provide a heat transfer image-receiving sheet for use in the heat transfer process using a sublimable dye, which can give a sharp image having a sufficient density and excellent fastness characteristics even if the time of application of the heat energy is very short.
In accordance with the present invention, this object can be attained by 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, wherein said dye-receiving layer comprises a resin containing a polar group and/or a salt thereof in an amount of 2 to 2,000 equivalents per 10.sup.6 g of the resin, and a heat transfer process using the receiving sheet.
If a receiving layer of the heat transfer image-receiving sheet is formed of a polar resin having a specific polar group concentration, even when a dye having a relatively low molecular weight is used, the bleeding resistance of the received dye is improved and an image having excellent sharpness, density and preservability can be formed. Furthermore, even if a dye having a relatively high molecular weight is used, since the dye-receiving property is excellent,

REFERENCES:
patent: 4555427 (1985-11-01), Kawasaki et al.

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