JP2555599B2 - Thermal transfer recording material - Google Patents

Description

The present invention relates to a thermal transfer recording medium capable of reducing peeling noise during transfer by a thermal head.

(Prior Art) In recent years, the thermal transfer type recording method using a thermal head has advantages such as low noise at the time of transfer, relatively inexpensive and compact device, and excellent maintainability. It is beginning to spread rapidly. However, in reality, the sound at the time of transfer is noisy, and improvement for that is desired.

For example, the color thermal transfer method is roughly divided into a method using a sublimation dye and a resin and a method using a wax, a pigment and a thermoplastic resin in the former method, in which only the dye is sublimated by heat from a thermal head. Since it is transferred from inside the resin, there is almost no transfer of the resin itself, so the peeling noise is essentially less, but the thermal energy is 2 to 3 times that of the latter method. A problem is the stick sound due to the so-called "stick phenomenon" where the head is fused.

On the other hand, in the latter method, the wax, the pigment, and the thermoplastic resin as the binder are all transferred to the transferred body by the heat from the thermal head, so that the peeling noise is apt to be generated essentially. However, also in the latter case, it is conventionally considered that the sound at the time of this transfer is mostly due to the stick sound, and various solutions for this have been proposed (JP-A-61-189992, JP-A-56-187396, Japanese Patent Publication 58-13359).

(Problems to be Solved by the Invention) However, these proposals do not lead to reduction of the peeling noise itself in the latter method, and a solution thereof has been demanded.

An object of the present invention is to reduce the peeling sound generated by the latter transfer method, that is, the sound generated when the colored transfer layer is peeled off during transfer from the base material sheet of the thermal recording medium.

(Means for Solving Problems) As a means for solving the above problems, the present invention provides an easily peelable layer made of a specific material between a base sheet of a thermal transfer recording material and a colored transfer layer. The method of intervening was adopted.

That is, the present invention is a substrate sheet, an easily peelable layer made of polyvinyl octadecyl carbamate or polyethyleneimine octadecyl carbamate laminated on the substrate sheet, and a dye or pigment laminated on the easily peelable layer. A heat-sensitive transfer recording material comprising a colored transfer layer containing a thermoplastic resin or an oligomer thereof.

The colored transfer layer may be composed of only one layer as long as the adhesiveness to the transferred material and the releasability from the substrate sheet are sufficiently good by themselves. A two- or three-layer structure in which a heat-fusible release layer is provided on the lower surface of the material sheet side and a heat-fusible adhesive layer is provided on the opposite upper surface thereof may be used. The heat-fusible release layer and the heat-fusible adhesive layer may be formed from a mixture containing an amide or imide compound or wax and a thermoplastic resin. This amide or imide compound or wax has a melting point of 50-
It is preferable to select one having a temperature of 100 ° C.

Dyes or pigments are contained in the colored transfer layer together with a binder composed of a thermoplastic resin or an oligomer thereof, and examples of the thermoplastic resin or the oligomer thereof include ethylene vinyl acetate, polyvinyl butyral, polyvinyl acetal, saturated Copolyester,
Styrene acrylic, styrene, polyethylene, etc. are used.

1 and 2 schematically show the constitution of the heat-sensitive transfer recording material according to the present invention. In the case of FIG. 1, a dye or a pigment and a heat Easily peelable layer 3 in which the colored transfer layer 2 containing a plastic resin binder is made of polyvinyl octadecyl carbamate or polyethyleneimine octadecyl carbamate
FIG. 2 is similar to the case of FIG. 1 in that the colored transfer layer 2 is laminated on the upper surface of the base material sheet 1 via the easy peeling layer 3 as well. However, in this case, the colored transfer layer 2 itself has a three-layer structure, and the lower surface of the base material sheet 1 side is a heat-fusible release layer 2a made of an amide or imide compound or wax and a thermoplastic resin,
The upper surface is a heat-fusible adhesive layer 2c made of an amide or imide compound or wax and a thermoplastic resin, and a colored layer 2b made of a dye or pigment and a thermoplastic resin or its oligomer is interposed as an intermediate layer. There is.

At the time of thermal transfer by the thermal head,
In any of the cases shown in FIG. 2, the portion of the colored transfer layer 2 is peeled off from the easily peelable layer 3 and is transferred to the transferred body (for example, image receiving paper).

(Example) A varnish having the following composition (1) was printed on a biaxially stretched polyester film (Lumirror 6CF53, trade name, manufactured by Toray Industries, Inc.) having a thickness of 5.7 μm with a gravure solid plate (depth 20 μm, 30 cm square). , And a thin film (easy peeling layer) having a thickness of 0.2 μm was formed.

Next, a heat-fusible release varnish of the following composition (2) was printed on this thin film by a gravure solid plate (depth 40 μm, 30 cm square), and further, an indigo ink of the following composition (3) was printed on the gravure plate ( A heat-sensitive transfer sheet was prepared by printing at a depth of 20 μm, 30 cm square, and again printing a heat-fusible adhesive varnish of the following composition (4) on a gravure solid plate (depth of 40 μm, 30 cm square).

This transfer sheet is overlaid on the image receiving paper TTR-T (trade name, manufactured by Mitsubishi Paper Mills Ltd.) and color printer (TN54 manufactured by Toshiba Corp.)
When the transfer was performed with 00, the product name), the peeling sound (printing sound) was at most 60 decibels.

For comparison, in the above example, the composition (1)
The above composition (2), (3) and (4) can be directly applied to the polyester film without forming a thin film with the varnish of
When a transfer sheet was prepared by laminating a printing layer according to the above, and transfer was carried out under the same conditions as in the above example, the peeling sound (printing sound) was 70 to 80 decibels.

Composition (1): The following composition was prepared by stirring at 50 ° C. for 20 minutes.

Composition (2): The following composition was prepared by kneading for 10 hours in a ball mill.

Composition (3): Overbased organisms were prepared by kneading for 24 hours in a ball mill.

Composition (4): The following composition was prepared by kneading for 10 hours in a hole mill.

[Brief description of drawings]

FIG. 1 is a sectional view of a mature transcription recorder according to the present invention, FIG.
The drawing is a sectional view of a thermal transfer recording medium according to another embodiment of the present invention. In the figure, 1 ... Base material sheet, 2 ... Colored transfer layer, 2a ... Heat-fusible peeling layer, 2b ... Heat-fusible adhesive layer, 3 ... Easy peeling layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-208987 (JP, A) JP-A-61-189992 (JP, A) JP-A-56-187396 (JP, A)

Claims (3)

(57) [Claims] 1. A substrate sheet, an easily peelable layer made of polyvinyl octadecyl carbamate or polyethyleneimine octadecyl carbamate laminated on the substrate sheet, a dye or pigment laminated on the easily peelable layer, and thermoplasticity. A thermal transfer recording material comprising a colored transfer layer containing a resin or an oligomer thereof. 2. The colored transfer layer has a heat-fusible release layer containing an amide or imide compound or wax and a thermoplastic resin on the lower surface of the base sheet side. The heat-sensitive transfer recording material according to the item. 3. The heat-sensitive transfer according to claim 1, wherein the colored transfer layer has a heat-fusible adhesive layer containing an amide or imide compound or wax and a thermoplastic resin on the upper surface. Record body.