JPH0686156B2 - Sublimation type thermal transfer image receiving paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is a sublimation type in which a coloring material of a thin leaf support is sublimated and transferred to an opposite recording medium by heating with a thermal head or the like to obtain a recording. The present invention relates to a sublimation thermal transfer recording medium suitable for use in a thermal transfer recording system, which has improved color forming characteristics, is economically inexpensive, and has good heat resistance.

(B) Conventional Technology In the conventional method, a coloring material sheet obtained by applying a sublimable coloring material to a thin sheet support such as paper is placed facing a thermal transfer recording material, and is transferred by heat with a thermal head or dyeing to record the recording material. To get the image record.

By making the color materials yellow, magenta, cyan and, if necessary, black, and sequentially performing thermal transfer, a full-color high-gradation hard copy can be obtained. As shown in Japanese Patent Publication No. 57-107885, it is known to provide a coating layer containing saturated polyester as a recording medium,
As disclosed in Japanese Patent Laid-Open No. 60-101090, it is generally used to use synthetic paper as a support in order to take advantage of high gradation characteristics.

(C) Problems to be Solved by the Invention In terms of image quality, the present system is capable of obtaining high-quality images with good gradation, and is synthesized as a support for a recording medium in order to maximize its characteristics. Although it is common to use paper, synthetic paper is not sufficient in terms of heat resistance and cost since the raw materials are polypro and polyester. When paper was used as the support, uniform image quality could not be obtained due to unevenness in density and the like.

(D) Means for Solving the Problems In the present invention, a thermal head is provided by using a receiving layer containing saturated polyester as a recording medium and paper as a support, and providing a cushion layer between the receiving layer and the support. It is possible to obtain a high-quality image that is inexpensive and has good heat resistance by improving the printability at the time of heat-printing with a paper or the like and using paper as a support. The cushion layer may be one that absorbs unevenness that causes printing unevenness such as density unevenness between the paper as the support and the receiving layer and the thermal head. Specifically, it is latex or the like, and among them, vinyl acetate latex As described above, a material having a cushioning property and capable of diffusing the sublimable coloring material into the film is preferable. If the coating amount of the cushion layer is too small, the effect will not be obtained, and preferably 5 g / m ² or more, and 5 to 20 g / m ² is suitable.

The saturated polyester in the present invention is a linear polymer saturated polyester formed by polycondensation of a dibasic acid and a dihydric alcohol, and polyethylene terephthalate obtained by polycondensation of terephthalic acid and ethylene glycol is typical. However, in order to improve the crystallinity, melting point, solubility, etc., there are many cases where two or more components are randomly copolymerized with a dibasic acid and a dihydric alcohol component.

In addition to these, polybutylene terephthalate, poly-1,4-
Examples include cyclohexane dimethylene ethylene terephthalate. These may be used as an organic solvent solution,
From the viewpoint of industrial productivity, it is preferable to use it as an aqueous dispersion system. Alternatively, it is preferable to use a water-soluble polyester such as a copolyester of a mixed carboxylic acid with a sulfonated phthalic acid isomer and ethylene glycol.

The sublimation colorant used in the present invention preferably has a sublimation point in the range of 70 to 400 ° C, and more preferably 150 to 250 ° C.

For example, Disperse Blue 20 (trade name Duranol Blue 2
G), Disperse Yellow 42 (trade name Resulin Yellow
GR), Disperse Red 1 (Product name Celiton Scarlet
B) and other disperse dyes, other quinalizarin dyes, dispersible monoazo dyes, dispersible anthraquinone dyes, disperse nitrodiphenyl dyes, anthracene dyes and the like. From the standpoint, a thin sheet having as high thermal conductivity as possible is preferable, paper such as condenser paper and glassine paper, synthetic paper, synthetic resin film can be used, and synthetic resin film is preferable from the viewpoint of uniformity of image quality.

In addition, inorganic fine particles such as silica, calcium carbonate, kaolin, clay and colloidal silica may be added from the viewpoint of preventing heat fusion between the color material sheet and the image receiving paper.

The color material sheet can be prepared by using an adhesive that does not hinder sublimation, and the dye sheet can be prepared by ink conversion such as gravure printing.

To create a recording medium, vinyl acetate latex was used as a cushion layer on paper as a support, and if necessary,
Silica, kaolin, clay, pigments such as colloidal silica are mixed and applied, and on the saturated polyester resin,
Cellulose as a binder, if necessary,
A high melting point heat-soluble polymer adhesive such as starch, melamine resin, epoxy resin, etc. is used, and silica, kaolin, calcium carbonate, clay, colloidal silica, etc. are also used because of running stability in heat fusion. It is possible. It can be obtained by mixing and dispersing them, coating them on the cushion layer with a coating machine having an ordinary coater head such as an air knife, a roll, a blade, and drying.

(E) Action The action of the cushion layer containing the vinyl acetate latex in the present invention is that the coloring material sheet and the recording medium sandwiched between the thermal head and the platen roll, especially the density unevenness of the paper as the support, etc. It is conceivable to obtain a high-quality image with less printing unevenness by absorbing the unevenness.

Further, the vinyl acetate latex is considered to have an action of spreading a sublimable disperse dye in the film, and it is considered that the printing density is improved and a high quality image is obtained. The support is paper, and heat resistance is sufficient with heat from a thermal head or the like, and it is economically inexpensive.

(F) Examples Next, the present invention will be described in more detail with reference to Examples.
It is not limited to these specific examples.

Example 1 10 g of Kayaset Blue 906 (manufactured by Nippon Kayaku Co., Ltd.) as a dispersible sublimable coloring material on a condenser paper having a thickness of 10 microns,
Byron # 290 (Toyobo Co., Ltd., polyester resin) 3 g and Aerosil R-972 (Nippon Aerosil Co., Ltd., hydrophobic silica) 2 g, toluene 63 g, and methyl ethyl ketone 17 g are mixed and pulverized in a ball mill for 24 hours, and the coating amount is 2 g by gravure printing. / m
^It was applied so as to be ² and dried to obtain a color material sheet.

WE-40 (Vinyl acetate emulsion manufactured by Arakawa Chemical Co., Ltd.) as a cushion layer on high-quality paper with a basis weight of 80 g / m ² as a recording medium.
Was coated with an air knife coater to a coating amount of 5 g / m ² .

Bayronal MD-1200 (Toyobo Co., Ltd., polyester resin aqueous dispersion) 100 g, Snowtex C (Nissan Chemical Co., Ltd.,
150 g of colloidal silica) and 100 g of Cerosol B-961 (Ethylene bis stearoamide emulsion manufactured by Chukyo Yushi Co., Ltd.) are mixed and dispersed at a solid weight, and smeared with an air knife coater to a coating amount of 4 g / m ² , It was dried to obtain a heat transfer image receiving paper.

The color material sheet and the transfer surface of the thermal transfer image receiving paper are opposed to each other, and a thin film thermal head manufactured by Matsushita Electronic Components Co., Ltd. is used to print from the back surface of the color material sheet under the conditions of a head voltage of 16 V and an energization width of 3.4 msec. As a result of the transfer to, a uniform image quality with high print density was obtained. (Table-1) Comparative Example-1 Table-1 shows the results obtained in the same manner as in Example-1, except that the cushion layer was not provided.

Comparative Example-2 Table-1 shows the results obtained in the same manner as in Example-1, except that Permarin PN (polyethylene emulsion manufactured by Sanyo Kasei Co., Ltd.) was used as the cushion layer.

Comparative Example-3 Table-1 shows the results obtained in the same manner as in Example-1, except that the cushion layer was replaced by HEC (Fuji Chemical Co., hydroxyethyl cellulose).

Comparative Example-4 In Example-1, as a support, synthetic paper (manufactured by Oji Yuka Co., Ltd.,
The results obtained in the same manner using FPG-150) are shown in Table-1.

(G) Effects of the invention As is clear from Table 1, a recording medium using paper as a support and a cushion layer of vinyl acetate latex provided between the support and the receiving layer is a support. Since the body is paper, it is cheaper than synthetic paper, has high heat resistance in terms of quality, and provides high-quality image quality without uneven printing.

Claims (1)

[Claims] 1. A sublimation type thermal transfer recording system in which a coloring material sheet having a heat sublimable coloring material layer and a sublimation type thermal transfer image receiving paper having an image receiving layer are combined and an image is recorded on the image receiving paper by heating. A sublimation-type thermal transfer image-receiving paper, characterized in that a cushion layer containing vinyl acetate latex is provided between the image receiving layer and the support by using paper as the sheet.