Heat transfer sheet

Details Heat transfer sheet Heat transfer sheet

1990-04-30

1994-02-15

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

052867056

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a heat transfer sheet and, more particularly, to a heat transfer sheet capable of easily providing a recording image excelling in various fastness properties.


BACKGROUND ART

Heretofore, various heat transfer techniques have been known in the art, including sublimation type transfer systems wherein a sublimable dye is carried on a substrate sheet such as paper to make a heat transfer sheet, which is then overlaid on an imageable material (image-receiving material), for instance, a woven fabric made of polyester to apply heat energy in the form of a pattern from the back side of the heat transfer sheet, thereby transferring the sublimable dye into the imageable material.
With a sublimation textile printing system of the above sublimation transfer systems, in which the imageable material used is made of, e.g., a polyester textile, relatively satisfactory dye transfer is achieved, since heat energy is applied over a relatively extended period of time so that the imageable material per se can be heated by that heat energy.
With an advance in recording techniques, however, fine characters or figures or photographic images could have been formed at high speeds on imageable materials made of, e.g., polyester or paper sheets having thereon a dye-receiving layer by means of a thermal head, etc. In this case, the application of thermal energy is required to be achieved within a time as short as fractions of a second. However, no image of sufficient density can be obtained, since the sublimable dyes and imageable materials are not well heated within such a short time.
In order to cope with such high-speed recording, sublimable dyes excelling in sublimability have thus been developed. However, problems with such dyes of excellent sublimability are that after transfer, they transfer into the imageable materials or bleed onto their surfaces with time, generally because of their low molecular weight. In consequence, the images, once formed, become out of order or blurred, or otherwise contaminate surrounding articles.
In the art of heat transfer using sublimable dyes, there is thus still strong demand for the development of a heat transfer sheet which provides a clear image of sufficient density by the application of thermal energy within such short a time as mentioned above and imparts improved fastness properties to the formed image.
It is therefore an object of the present invention to satisfy the above demand.


DISCLOSURE OF THE INVENTION

Thus, the present invention provides a heat transfer sheet comprising a substrate sheet and a dye carrying layer formed on its one major side, characterized in that a dye included in said dye carrying layer is expressed by the following general formula (I): ##STR2## wherein: R.sub.1 stands for a hydrogen atom, a halogen atom or a substituent such as an alkyl, aryl, cycloalkyl, arylalkyl, alkoxy, acylamino or aminocarbonyl group which may include a substituent, a substituent, or may form a ring together, and
According to another aspect of the present invention, there is provided a heat transfer sheet comprising a substrate sheet and a dye carrying layer formed on its major side, characterized in that a dye included in said dye carrying layer is expressed by the following general formula (II): ##STR3## wherein: A stands for a cyano, alkoxycarbonyl, aryloxycarbonyl, carbamoyl, alkylcarbamoyl, arylcarbamoyl, alkylcarbonyl, arylcarbonyl, alkylsulfonyl, alkylsulfonylamino, arylsulfonyl or aryl group, group, or an atom or atomic group which form a five- or six-membered ring together with Z, group, include an oxygen or nitrogen atom, acylamino group which may include a substituent, cyano, acylamino or aryl group which may include a substituent, or six-membered ring together with R.sub.1, and
Studies of the present inventors have revealed that it is an essential condition for conventional sublimation textile printing techniques using textiles or woven fabrics of polyester, etc. that the dye used is sublimable or vaporizable (i.e., has the

REFERENCES:
patent: 5077264 (1991-12-01), Hayashi et al.
Patent Abstracts of Japan, vol. 14, No. 23 (M-920)(3966) Jan. 17, 1990, & JP-A-01 263082 (Mitsubishi Kasei Corporation) Oct. 19, 1989.

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