JPS6132794A - Hot-melt transfer type recording material - Google Patents

Abstract

PURPOSE:To provide the titled material generating no background staining even if a binder with low melt viscosity or low softening point is used in an ink layer and suitable for a thermal transfer or current-passing transfer recording system, constituted by allowing a spherical substance to be present in the ink layer or on the surface thereof. CONSTITUTION:A spherical substance (pref., particulate styrene with a particle size of 1-20mum) is allowed to be present in the ink layer 1 provided on a base layer 3 or on the surface thereof to obtain the objective material. Furthermore, the binder of the ink layer 1 is pref. one with viscosity of 10<2>cp or less. EFFECT:Printing density is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a thermal melt transfer type recording material used in a thermal transfer or electric transfer recording system.

Conventional thermal transfer recording systems and electrical transfer recording systems have advantages such as high recording speed, no noise, and compactness of the apparatus. Thermal melt transfer M recording materials used in these recording methods include a two-layer type consisting of a general K(-) layer and an ink layer, and a three-layer type with an intermediate layer interposed.

In order to improve the recording sensitivity or thermal sensitivity of this recording material, it is desirable to use an inder with a low melt viscosity or a low softening point in the ink layer. However, on the other hand, it has the disadvantage that it tends to cause background stains. Therefore, it has been difficult to use a material with a sufficiently low melt viscosity or softening point as an inder for the ink layer.

Purpose An object of the present invention is to provide a hot melt transfer type recording material which uses a noise/darer with a low melting viscosity or a low softening point in the ink layer and which does not cause background smearing.

Structure The present invention relates to a thermal melt transfer type recording material having at least a base layer and an ink layer, wherein the inner surface of the ink layer is characterized in that a spherical substance is present on the surface.

FIG. 1 shows a schematic cross-sectional view of the recording material of the present invention. In the figure,
1 is an ink layer, 2 is a spherical substance (spacer), and 3 is a base layer. Figure 1 shows the case when a large particle size spacer is used, 1st figure shows the case when a medium particle size spacer is used, 1st figure shows the case when a small particle size spacer is used. This shows the aspect of

The spacer 2 preferably has a particle size of 1 to 20 μm. 1μ
If it is less than 20μ, the effect of the spacer cannot be obtained.
Exceeding this will actually have a negative effect on the transferred image. The material for the spacer can be organic materials such as styrene, acrylic, acrylonitrile, and chlorine, or inorganic materials such as silica, alumina, and glass zest, as long as they can withstand the heat and pressure during transfer. .

Conventionally known materials can be used for forming the ink layer 1 and the paste layer 3 of the recording material of the present invention.

For example, for electrical transfer, (1) a two-layer structure in which an ink layer 1 consisting of a coloring component and a heat-melting inder is provided on a paste layer 3 consisting of a carton and a film-forming reamer; (2) A three-layer structure in which an intermediate layer is provided between the paste layer 3 and the ink layer 1 to have a peeling action, an adhesion action, or a heat generation action depending on the purpose.

Polyester film for thermal transfer? An ink layer mainly composed of wax and colorants (pigments/dyes) is provided on a paste layer such as a limide film or condenser paper, or an intermediate layer as described in (2) above is interposed between these layers. I can give you things.

The binder for the ink layer preferably has a low viscosity of 10.ap or less, preferably 10''ep or less.

In order to perform, for example, electrical transfer recording using the recording material of the present invention, the ink layer 1 is brought into close contact with the recording body 8, and the return electrode 5 is brought into contact with the paste layer 3, as in the conventional method shown in FIG. In addition, a current signal from the recording applied voltage 6 may be applied to the pace layer 3 through the recording needle 7. Recording material 4
When energization is applied, the current density directly below the recording needle is maximum, and since the return electrode δ has a larger contact area than the recording needle 7, the current spreads as it approaches the return electrode 5, resulting in a current density of 9. becomes smaller.

The Joule heat generated by this energization softens or melts the ink and transfers it to the recording medium 8. Here, an image corresponding to the current signal is formed on the recording medium 8.

Effects According to the present invention, since the spacer is present in the ink layer, scumming does not occur even if a low-viscosity inder is used for the ink layer. Therefore, it is possible to use a binder with a low viscosity, which has been difficult to apply as a material for the ink layer in the past, and to improve print density.

Example 1 An ink having a composition of 80% wax, 5% ethylene-vinyl acetate copolymer, and 15% carin black was placed on a 15μ thick electrical transfer paste containing 15% carin black in a polycarbonate resin. The layers were applied at a thickness of 5μ.

Next, a spherical C- made of styrene-nBMA (7/8)
After dispersing the particles (average particle size 10μ±1μ) in ethanol, the second layer was made by squeezing it onto the ink layer with a wire spray.
-I made recording materials as shown in the diagram.

In addition, for comparison, a recording material (Comparative Example 1) was prepared in which no C-s (spacer) was used.

In addition, the ink composition can be changed to wax 40 without using a spacer.
%, 30% ethylene-vinyl acetate copolymer, and 30% carin black (Comparative Example 2).

When these recording materials were electrically transferred onto plain paper,
The results shown in the table below were obtained.

Example 2 On a polyester film with a thickness of 6μ thermal transfer paste,
60% wax, 26% oil, car in black 15
A recording material was prepared in which an ink layer having a composition of 1.5 μm was provided with a thickness of 4 μm, and glass beads of 5 μm were interposed as spacers in the ink layer as shown in FIG. 2-(B). A recording material was also prepared in which styrene beads of 2 .mu.m were adhered to the surface of the ink layer as a spacer as shown in FIG.

When these recording materials were thermally transferred to plain paper at an applied voltage of 8 V, the background smear that had occurred without the spacer could be eliminated in all cases.

[Brief explanation of drawings]

FIG. 1 shows a schematic cross-sectional view of the recording material of the present invention, and FIG. 2 shows an outline of an electrical transfer recording method using the recording material of the present invention. 1... Ink P712... Spherical substance (spacer)
3...Base layer 4...Recording material 8...Recording material city 1 flash

Claims (1)

[Claims] 1. A hot melt transfer recording material comprising at least a base layer and an ink layer, characterized in that a spherical substance is present inside or on the surface of the ink layer.