JPS60236788A - Heat transfer recording medium - Google Patents

Abstract

PURPOSE:To provide the titled medium for an ink doner film or the like, having a reduced peel strength and capable of maintaining high density, high resolution and high image quality, wherein an intermediate layer the adhesion of which to an ink is lower than the adhesion thereof to a base is provided between a base and an ink layer. CONSTITUTION:The intermediate layer 3 (e.g., an oil-repellent arcylic resin layer) the adhesion of which to an ink is lower than the adhesion thereof to the base 1 (e.g., a polyester film having a thickness of 5-20mum) is provided between the base 1 and a heat-fusible ink layer 2 to obtain the objective medium.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a thermal recording medium used in a transfer-type thermal recording method, specifically, an ink donor film in which ink is melted by heating and transferred onto recording paper. Regarding.

In the conventional transfer type thermal recording method, a thermal recording medium (ink donor film) comprising a support such as paper or a plastic film with a heat-melting or heat-sublimating ink layer provided on one or both sides of the support is overlaid with a transfer sheet. Image information is recorded by selectively heating a thermal recording medium according to image information, and transferring ink melted or sublimated by the heat onto a transfer sheet.

Conventionally, ink donor films used in such recording methods have a high adhesion between the ink and the substrate, and a high peel strength, so that the ink on the substrate does not transfer completely to the paper. There was a decrease in density and resolution.

In addition, if a film such as capacitor paper or a film with low surface smoothness is used as a base material, the unevenness of the surface may cause
The amount of ink transferred was affected, resulting in the above-mentioned problems.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide an ink toner film that can always maintain high density and high resolution.

Structure of the Invention The present invention aims to provide an intermediate layer between a support and a hot-melt ink layer, which has a smaller adhesion force to the ink than the adhesion force to the support, so that the peel strength is reduced. This has been achieved.

That is, the present invention provides a thermal transfer recording medium in which a heat-melting ink layer 2 is laminated on a support 1 as shown in FIG.
This thermal transfer recording medium is characterized in that an intermediate layer 3 having a smaller adhesion force with the ink than the adhesion force with the support is provided between the support and the heat-melting ink layer.

In the present invention, in FIG. 1, if the adhesion force between the ink layer 2 and the intermediate layer 3 is Pl, and the adhesion force between the intermediate layer and the base material l is P2, then the relationship of the intermediate layer is Pl<P2. Just set the material. Furthermore, when there is no intermediate layer, that is, when an ink layer is laminated on a base material like a conventional ink donor film, the adhesion between the base material and the ink layer is P3, then P2
It is preferable to set it to an intermediate layer having the relationship <P3.

An example of such a material layer is an acrylic resin layer having oil repellency.

In the thermal transfer recording medium of the present invention, conventionally used supports and heat-melting inks can be used. That is, a polyester film having a thickness of 5 to 20 microns, capacitor paper, etc. can be used as the support. Further, as the heat-melting ink, an ink layer having a composition as shown in Table 1 is provided to a thickness of 3 to 10 microns.

Table 1 Pigment (Carbon Black) Colorant 20 Carnauba・
Wax Binder 20 Ester Wax 4
0 Oil Softener 10 Other Additives 1° The thickness of the intermediate layer is 0.5 to 3μ, preferably about 1μ. In the present invention, a resin layer is provided by coating and drying a resin solution on a support, and a thin ink layer is further provided thereon by a conventional true melt coating method or a solvent coating method using water or an organic solvent. A thermal recording medium is obtained.

Effects of the Invention When printing is performed using the ink donor film of the present invention, all of the melted ink due to heating is easily transferred to the recording paper side, making it possible to obtain a high-quality recorded image without density unevenness. .

EXAMPLE An acrylic resin solution was applied as an intermediate layer to a thickness of 05 μm (dry) on a capacitor paper having a thickness of 10 μm.

Furthermore, an ink having the composition shown in Table 1 was applied thereon to a thickness of 3.5 μm using a hot norl coating method to obtain a thermal recording medium. As a transfer sheet, high-quality paper (60 g/m2) was prepared under the environmental conditions of a temperature of 32°C and a humidity of (R-H, )ss%.
Using paper that had been left for 2 hours, Xerox printer P6
I also used it to print.

The heat-melting ink of this example was lipophilic, and upon heating, the molten ink was easily peeled off from the intermediate layer and transferred to the recording paper, resulting in a clear image without density unevenness.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of the thermal transfer recording medium of the present invention. Symbols in the figure: 1...Support; 2...Ink layer; 3...Intermediate layer. Agent Ben Sotoshi (8107) Kiyotaka Sasaki (and 3 others)

Claims (1)

[Claims] A thermal transfer recording medium having a heat-fusible ink layer on a support, characterized in that an intermediate layer is provided between the support and the heat-fusible ink layer, and the adhesion force to the ink is smaller than the adhesion force to the support. A thermal transfer recording medium.