JPS58102796A - Polychrome thermo-sensitive recording method - Google Patents

Abstract

PURPOSE:To obtain a polychrome recording picture on an image receiving sheet by changing the temperature of heating by using a plurality of colorless thermal sublimating dyes having the different temperature of sublimation. CONSTITUTION:A transfer sheet 3 in which a layer 2 containing cyan color- forming colorless thermal sublimating dyes (high-temperature sublimating dyes) 7 and magenta color-forming colorless thermal sublimating dyes (low-temperature sublimating dyes) 8 is formed onto one surface of glassine 1 as a supporter with 5-40 micron thickness and the image receiving sheet 6 in which a layer 4 containing an acidic substance coloring colorless thermal sublimating dyes is shaped onto slick paper 5 are stacked. Data are printed by means of heat-sensitive heads A, B having different temperatures from the transfer sheet 3 side. A magenta image 9 is obtained on the image receiving sheet 6 in the low-temparature heating section A, and a blue image 10 in which magenta and cyan are mixed is acquired on the image receiving sheet 6 in the high-temperature heating section B. When yellow color-forming colorless heat sublimating dyes sublimating at a low temperature is added previously to the layer 2, a red image is obtained on the image receiving sheet 6 in the low-temperature heating section A and a black image in the high-temperature heating section B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor thermosensitive recording method using a colorless thermosublimable dye. More specifically, a transfer sheet consisting of a support of 5 to 40 mm in thickness and having layers containing a plurality of colorless heat-sublimable dyes having different heat sublimation temperatures, and an acidic substance that colors the colorless heat-sublimable dye are used. Consists of an image-receiving sheet with a layer containing
, transfer sheet side> This invention relates to a heat-sensitive recording method for obtaining multicolor recorded images on an image-receiving sheet by heating the transfer sheet side by changing the temperature.

The thermal recording method using heat-sublimable dyes uses a transfer sheet having a transfer layer containing colored heat-sublimable dyes, and uses paper,
Various methods are known for thermally transferring colored heat-sublimable dyes to glass, metal foil, etc. to obtain recorded images. However, the heat sublimable dyes used in them are colored dyes.
Furthermore, since high-quality paper with insufficient dye adsorption ability was used as the image-receiving sheet, the resolution of the image obtained when the dye was sublimated from the transfer sheet F by heating was poor and lacked sharpness. Furthermore, since the transfer sheet is colored, its appearance is poor and the transfer sheet must be collected into the recording device after thermal printing.Therefore, it is desired to develop a transfer sheet without coloring. It is an object of the present invention to provide a multicolor thermosensitive recording method that can be used in computer terminal printers.

The present invention is characterized by using a colorless heat-sublimable dye to obtain a colored recording surface gI on an image-receiving sheet provided with a material layer on a cm-like material, and by using a plurality of colorless heat-sublimable dyes having different sublimation temperatures. ,
``Multicolor recording teeth can be recorded by changing the heating temperature.''

The colorless heat-sublimable dye used in the present invention is 3,7-pisdiethylamino-10, which develops a cyan color.
- Acylleucophenoxazine compounds such as dichloroacetyl-7-enoxazine, etc., develop a magenta color. N-phenyl)amino-1s: a'-)limethylsubisono(2H-1-
To
Also, N-bis (4
-Dimethylphenyl)methyl-N-ethylaniline and other leuco dyes are available.Colorless heat-sublimable dyes are crushed and dispersed in a ball builder, etc. to a thickness of 5.
Coated on a support of 5 to 4 liters, but used with a water-soluble binder such as diethylcellulose, methylcellulose, polyvinyl alcohol in hydrocarbons or an aqueous emulsion such as styrene-butadiene latex. is preferred.Additives such as sublimation accelerators may also be added.

The support having a thickness of 5 to 40 tons is preferably one having good thermal conductivity, and examples thereof include papers such as capacitor paper and glassine paper, and glass films such as polyethylene terephthalate and polyethylene.

For example, if you need to record in two colors, red and red, use a colorless heat-sublimable dye that produces cyan color! It is sufficient to use one that produces zenta color. However, in order to obtain a clear two-color image on an image-receiving sheet, the thermal sublimation temperature of two or more dyes used is lθ℃.
Dyes must be selected according to the above. Two or more colorless dyes having different thermal sublimation temperatures are coated on a support with a thickness of 5 to 40 micrometers, either in the same layer or in separate layers in a laminated form. - Since the coloring of the transfer sheet obtained in this way is #1, there is no need to collect the transfer sheet into the recording device after printing, and the recorded image immediately after printing can be viewed through the transfer sheet. It is also possible.

An acidic substance that turns a colorless heat-sublimable dye into a colored one.

Free substances such as activated clay and anti-olide, and organic acidic substances such as bisphenol A1 salicylic acid derivatives to I'-phenylphenol are effective. An image-receiving sheet is an image-receiving sheet in which these acidic substances are applied alone or dispersed in a binder to a support such as paper or film. Among them, activated clay is particularly suitable as the acidic substance used in the present invention because it has excellent dye adsorption ability and has a clear hue after coloring.

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 shows, for example, a transfer sheet 3 in which a layer 2 containing a cyan coloring colorless heat sublimation dye (high temperature sublimation dye) 7 and a magenta coloring colorless heat sublimation dye (low temperature sublimation dye) 8 is provided on one side of 25-tone glassine paper 10. An image receiving sheet 6 having a layer 4 containing an acidic substance for coloring a colorless heat-sublimable dye on a high-quality paper 5 is superimposed on the image receiving sheet 6, and thermal heads A and B having different temperatures from the transfer sheet side are placed on top of each other.
When printing is performed, a magenta color gI9 is obtained on the image receiving sheet in the low temperature heating section B, and a blue image 10 in which magenta and cyan are mixed is obtained on the image receiving sheet 6 in the high temperature heating section B. In addition, a layer 2 of low-temperature sublimable yellow colorless heat-sublimable dye is applied.
In addition, a red image can be obtained on the image-receiving sheet 6 in the low-temperature heating section B, and a black image can be obtained in the high-temperature heating section B.

Furthermore, by changing the selection of colorless thermosublimable dyes and heating conditions, thermal recording of 12 or more colors is possible.

Next, to explain the present invention in more detail, Although examples will be described, they do not limit the present invention. .

Example l.

Each of the liquid B-2 was ground separately in a ball mill for 2 days, and the liquid B-2 was crushed.
The mixed solution was stirred and mixed at a ratio of 1:1 to one side of thick 525-tone glassine paper so that the coated amount after drying was 41/wl, and dried at a relatively low temperature to obtain a transfer sheet.

On the other hand, 10 parts by weight of activated clay (Mizusawa Kagaku - Line Silton) was dispersed in 20 parts by weight of water to make 50% 8BR latex 4.
The product to which the heavy lid was added was coated on 5° 1/d high-quality paper so that the coated amount after drying was 711/l and dried to obtain an image-receiving sheet.

Printing was performed from the transfer sheet side using a thermal head heated to 170° C. so that the coated surface of the transfer sheet and the coated surface of the image-receiving sheet faced each other, resulting in a bright magenta printed edge on the image-receiving sheet. Furthermore, when printing was performed using a thermal head heated to 20°C, a printed image of a mixed color of magenta and cyan was produced on the image receiving sheet. Mix the M and B solutions obtained in A:B:O-4:2:1 (D ratio) on one side of a 15μ thick capacitor paper with a coating amount of 31/v after drying.
m to become st! Spread it on a cloth, dry it at a relatively low temperature, and use it as a transfer sheet.

When the coated surface of the transfer sheet and the coated surface of the image-receiving sheet obtained in Example 1 were stacked so as to face each other and heated to 170°C from the transfer sheet side and printed with a thermal head, a mixture of yellow and magenta was observed on the image-receiving sheet. A red printed image was obtained, and further printing was performed using a thermal head heated to 200° C., resulting in a reprinted color mixture of yellow, magenta, and cyan on the image-receiving sheet.

[Brief explanation of the drawing]

Figure 1.21 is a diagram mechanically illustrating the operation of the multicolor thermal recording method of the present invention. Figure 1 shows the state during heating printing, and Figure 2 shows the state after heating printing. - Medium is a low-temperature thermal head, B is a high-temperature thermal head, 1 is a support with a thickness of 5 to 40 microns, 2 is a layer containing a colorless heat sublimable dye, 3 is a transfer sheet, 4 is a layer containing an acidic substance, 5 is a support, and 6 is a seedling receiving sheet. Figure 1

Claims (1)

[Claims] (1) A transfer sheet in which a layer containing a colorless heat sublimable dye is provided on a support with a thickness of 4 (intersecting), and an acidic layer that changes the colorless heat sublimable dye onto the support. In a heat-sensitive recording method comprising a combination of an image-receiving sheet provided with a layer including a colorless dye, the image-receiving sheet is formed by heating the image-receiving sheet at a different temperature than the transfer sheet side. Multicolor thermal recording method 0 (2) The multicolor thermal recording method 0 according to claim 1, wherein the II substance is activated clay.