Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1990-03-12
1992-03-17
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
8471, 428195, 428913, 428914, B41M 5035, B41M 526
Patent
active
050968742
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a heat-sensitive transfer method and a combination of a heat transfer sheet and an image-receiving sheet to be used for that method.
BACKGROUND ART
Heat-sensitive transfer recording has been practiced by superposing an image-receiving sheet on a heat transfer sheet having a dye layer containing a heat migratable dye provided thereon under a state where the receiving layer surface of the image-receiving sheet is opposed to the dye layer, and heating the heat transfer sheet by a heating means such as a thermal head which is controlled by electrical signals from the back of the heat transfer sheet, thereby transferring the dye in the dye layer into the receiving layer.
However, in the heat-sensitive transfer method of the prior art, it has been difficult to obtain a printed image having good storability and high recording density.
In general, the dye to be used in the dye layer on the heat transfer sheet has been selected in view of such parameters as recording sensitivity, storability, hue, and dye solubility into ink or binder resin. Among these parameters, recording sensitivity, and storability have been known in the art to have great relationships with molecular weight of the dye and sublimation temperature. For example, it has been considered that the recording sensitivity becomes higher as the molecular weight of the dye is smaller and the sublimation temperature is lower, while storability becomes better as the molecular weight of the dye is larger and the sublimation temperature is higher. From such standpoints, in the prior art, in view of the balance between the both, dyes having molecular weights of about 150 to 800, more preferably 350 to 700, have been frequently selected as desirable ones.
However, even among the dyes having molecular weights within the range of 350 to 700, there are fewer dyes than expected which can give rise to good recording sensitivity, and a dye having desirable performance has been selected and used by repeating screening from a large number of candidates of dyes under the present situation.
Also, the recording sensitivity when performing practical heat transfer is also greatly affected by the combination of the heat transfer sheet and the image-receiving sheet. That is, the combination of the dye layer and the receiving layer, for determining what combination of the receiving layer with the dye selected as described above is optimum, one having better recording sensitivity has been selected also by repeating screening from a large number of materials for formation of receiving layer under the present situation.
Thus, in the development of heat-sensitive recording materials of the prior art, the selection criterion according to dye molecular weight for judgement goodness or badness of recording sensitivity is very vague, and no combination of good materials can be obtained before repeating screening for many times as mentioned above and yet performing practically printing, whereby many difficulties have been encountered in development of heat-sensitive recording materials.
DISCLOSURE OF THE INVENTION
The present invention has been accomplished in view of the problems of the prior art as described above, and its object is to provide a heat-sensitive transfer method which ensured image formation having good storability and high printing density.
The present inventors have studied intensively the factors which determine the combination so that the recording sensitivity may be optimized in combining a heat transfer sheet and an image-receiving sheet. It consequently has been found that particularly the two factors of the dye diffusion coefficient in the receiving layer of the image-receiving sheet and the dye saturated transfer ratio from the dye layer of the heat transfer sheet to the receiving layer of the image-receiving sheet are important factors in improvement of recording sensitivity.
The heat-sensitive transfer method has been accomplished on the basis of the above finding, and more particularly is a heat-sensitive tran
Dai Nippon Insatsu Kabushiki Kaisha
Hess Bruce H.
LandOfFree
Heat-sensitive transfer method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Heat-sensitive transfer method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heat-sensitive transfer method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1475861