Sublimation ink ribbon

Details Sublimation ink ribbon Sublimation ink ribbon

1985-02-26

1987-03-24

Wright, Jr., Ernest T.

Printing

Planographic

Lithographic plate making, and processes of making or using...

400120, 4002411, 4002403, 4002404, 428341, 428913, 428914, B41M 526

Patent

active

046516450

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a sublimation ink ribbon capable of printing on a printing paper a still picture image of various picture images such as a picture image shot by a video camera, a television picture image and so on to thereby obtain a hard copy.
2. Background Art
To print the above picture image on a printing paper, there is known a method in which a sublimation ink ribbon coated with a sublimation dye is superposed on the printing paper to which the heat of a pattern corresponding to the picture image information is applied by a thermal print head and the sublimation dye coated on the ink ribbon is sublimated and then transferred to the printing paper in accordance with the above pattern.
According to the thermal sublimation ink ribbon in which the sublimation dye is sublimated and transferred to the printing paper by the thermal print head to thereby obtain a picture image as described above, an ink provided by dissolving and dispersing a sublimation dye into a resin and a solvent is coated on a thin base material with heat-resisting property such as a paper and the like, the base material is heated at its back side by the thermal print head to sublimate only the dye contained in the ink and this dye is transferred to a printing paper coated on its surface with a resin such as polyester resin having excellent dye adsorbing property, whereby to form a color picture image.
The thermal sublimation ink ribbon used for this purpose is required to be capable of sublimating and transferring the sublimation dye in high concentration and uniformly and to be inhibited from lowering the whiteness degree on the surface of the printing paper except the portion on which the picture image is formed.
Generally, in forming the picture image by transferring the sublimation dye as described above, subtractive primaries of yellow, magenta and cyan are employed, in which three primary colors are sequentially sublimated and transferred. In this case, although the portion in which the three primary colors are transferred upon being superposed on one another becomes black in color, in some cases black ink is separately prepared and transferred to control the black concentration. In this case, if the concentration of the transferred dye is low on the whole, the concentration of the mixed color, particularly of the black and dark colors becomes low on the whole. As a result, the picture image becomes weak and unclear. Further, if the dye to be transferred is not uniformly sublimated and transferred, an unevenness in concentration occurs in the picture image with the result that it is impossible to obtain a fine picture image. A further problem occurs because of a so-called under layer soil phenomenon in which dye is transferred to the printing paper to portions where the transfer of the dye is neither intended nor desired. The resulting printing paper is colored differently from the image to be transferred, resulting in a reduced clarity and quality of the picture.
The present invention is to provide a thermal sublimation ink ribbon capable of sublimating and transferring to a printing paper a sublimation dye in high concentration and uniformly by a thermal print head so as to produce a uniform and clear picture image and which can effectively prevent the so-called under layer soil phenomenon in which a dye is transferred and colored on a printing paper in portions other than the portions of the printing paper on which the picture image is formed.
As a result of various experiments and considerations regarding the cause of the under layer soil phenomenon the present inventors found that one of the main causes thereof is that a dye appearing on the surface of the ink ribbon adheres to the printing paper and that another cause is that undesirable crystallization of the dye occurs in the ink layer and crystallized dye is apt to be dropped from the ink layer and transferred to the printing paper.
The present inventors found that one of the main causes of these phenomena is that when the

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patent: 4558329 (1985-12-01), Honda

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